CN105169926A - Flue gas desulphurization system and method for flue gas desulfurization by means of same - Google Patents

Abstract

The invention discloses a flue gas desulfurization system and a flue gas desulfurization method, wherein the flue gas desulfurization system includes a flue gas desulfurization tower, an ash storage device, a gypsum preparation device and an air induction device, and the flue gas desulfurization tower includes a tower body and a top-to-bottom The smoke exhaust device, mist removal device, cyclone reaction device, gas equalization device and multi-functional liquid collection tank are connected in sequence. The flue gas flue has a dry powder inlet connected with the dry powder desulfurization agent injection device. The liquid collection pool, the cyclone reaction device includes a cyclone outer shell and at least one cyclone chamber with at least one cyclone inside, the cyclone chamber is provided with a circulating reaction slurry inlet, the cyclone chamber communicates with the gas equalization device, and the cyclone It includes an impeller casing, an impeller central shaft and at least five swirl vanes, and the swirl vanes are arranged around the impeller central shaft. The flue gas desulfurization system of the present invention improves the flue gas desulfurization effect and desulfurization rate, saves space, does not need a pulping tank and a sinking tank, is convenient for maintenance, has low cost, saves energy, and avoids environmental pollution.

Description

A flue gas desulfurization system and a method for utilizing the flue gas desulfurization

technical field

The invention relates to a desulfurization device and auxiliary equipment used in desulfurization, in particular to a flue gas desulfurization system.

The present invention also relates to a flue gas desulfurization method, in particular to a flue gas desulfurization method using the aforementioned flue gas desulfurization system.

Background technique

With the continuous development of social industry, the degree of industrialization is getting higher and higher, and the scale of production is constantly expanding, and more and more flue gas is discharged into the atmosphere. Among the various gaseous pollutants that affect air quality, SO ₂ flue gas The quantity is the largest and the impact is the greatest. It causes acid rain, destroys the ecological environment, and affects people's health. Therefore, before these industrial flue gases are discharged into the atmosphere, they all need to be treated, and the most important one is desulfurization treatment.

At present, as shown in Fig. 1, the desulfurization of the existing desulfurization tower spraying method is commonly used in flue gas desulfurization for absorbing SO ₂ flue gas. The spray desulfurization device includes a spray tower, which includes a chimney 1, a mist eliminator 2, a spray chamber 3, an air equalization chamber 4, a circulation tank 5, a slurry tank 511 and a slurry tank 522 from top to bottom. Some desulfurization devices are also equipped with emergency pools, and at least two or more layers of spraying devices are installed in the spraying room. The gas equalization chamber 4 is used to evenly transport the flue gas to the desulfurization tower, and the circulation device 6 transports the desulfurization slurry such as limestone water slurry and limestone emulsion from the circulation pool 5 to each spray device in the spray chamber 3, and the high-speed flue gas The gas enters the spray device 3 and contacts with the desulfurization reaction slurry sprayed out at high speed from the spray nozzle, and under the action of the spray flow device 3, the desulfurization reaction slurry sprays into contact with the flue gas filled in the spray chamber 3 and performs the desulfurization reaction. Remove sulfur dioxide from flue gas. When the sprayed reaction slurry droplets are in contact with the flue gas for desulfurization, they drop from the spray chamber 3 through the homogeneous chamber 4 to the circulation pool 5, wait for the circulation system 6 to be extracted again, and then enter the spray device to be sprayed to desulfurize the flue gas. deal with. The desulfurization reaction slurry that has not reacted with the flue gas also falls from the spray chamber 3 through the gas equalization chamber 4 to the circulation pool 5, waits for the circulation system 6 to be extracted again, and then enters the spray device to be sprayed to desulfurize the flue gas. The flue gas from the spray desulfurization reaction in the spray chamber enters upward into the demister 2, because the flue gas carries the slurry droplets, and the demister 2 removes the desulfurization reaction slurry droplets carried by the flue gas as much as possible, and the desulfurization reaction The slurry droplets drop into the swirling flow chamber 3 and participate in desulfurization again, and then the desulfurization reaction slurry droplets pass through the gas equalization chamber 4 and fall to the circulation pool 5. When the concentration of the circulation pool 5 is too high, the reaction slurry in the circulation pool 5 is homogenized. It is extracted to the slurry tank 522, and then the desulfurization reaction slurry with a relatively high concentration of active ingredients in the desulfurization reaction produced in the slurry tank 511 is extracted into the circulation tank 5, and then is circulated and extracted to the spray device 3 for spraying for smoke Gas desulfurization. However, the disadvantages of the current spray desulfurization towers are as follows: firstly, the spray device needs a high-pressure pump to spray out the circulating desulfurization reaction slurry, so a relatively high injection pressure is required, so the energy consumption of the prepared high-pressure pump is relatively high, and it takes a lot of money. A large amount of electric energy causes energy waste; secondly, the nozzles of the spraying device are relatively easy to block, and because the droplets of the sprayed reaction slurry do not have many opportunities to contact the flue gas, and some droplets of the desulfurization reaction slurry do not contact the flue gas at all. It falls without contact, so the flue gas desulfurization efficiency is not high, and the desulfurization effect is not good; in addition, due to the configuration of a relatively multi-layer spray device, the cost is high and the structure is complicated, and additional pulping tanks 511 and sinking tanks 522 are required. Therefore, the overall occupied space is too large, and the maintenance cost is relatively high.

Contents of the invention

The present invention is completed in order to solve the deficiencies in the prior art. The purpose of the present invention is to provide a simple structure, before carrying out a pre-desulfurization in the flue gas flue, and then carry out cyclone desulfurization Reaction, improve flue gas desulfurization effect and desulfurization rate, save space, no longer need pulping tank and sinking tank, convenient for later maintenance, low maintenance cost, and effectively save energy and avoid environmental pollution. At the same time, the reaction slurry and preparation can be recycled Flue gas desulfurization system for desulfurization gypsum.

A flue gas desulfurization system of the present invention includes a flue gas desulfurization tower, an ash storage device, a gypsum preparation device and an air induction device, and the ash storage device, the air induction device and the gypsum preparation device are all connected to the flue gas desulfurization tower, and the The flue gas desulfurization tower includes a tower body and a smoke exhaust device, a mist removal device, a swirl reaction device, a gas equalizer and a multifunctional liquid collection pool arranged from top to bottom along the tower body, and the multifunctional liquid collection pool It communicates with the cyclone reaction device through a slurry circulation system for pumping the reaction slurry into the upper part of the cyclone reaction device, the top of the demisting device is connected with the smoke exhaust device, and the cyclone reaction device The top of the device communicates with the bottom of the demisting device, the bottom of the cyclone reaction device communicates with the top of the gas homogenizing device, the gas homogenizing device communicates with the flue gas flue, and the flue gas flue is close to the homogenizing device. A dry powder inlet is provided at the gas device, and the dry powder inlet is connected to a dry powder desulfurizer injection device for spraying dry powder to the dry powder inlet. The inflow direction of the gas flow is consistent, and the multi-functional liquid collection pool is directly below the gas equalization device. The swirl flow reaction device includes a swirl flow outer shell and at least two swirl flow chambers arranged horizontally in the swirl flow outer shell. At least one cyclone is arranged horizontally in the cyclone chamber, the upper part of the cyclone chamber is provided with a circulating reaction slurry inlet, the lower part of the cyclone chamber is connected to the gas homogenization device, and the cyclone includes a horizontally arranged cyclone impeller, The swirl impeller includes an impeller casing arranged on the outer periphery, an impeller central shaft arranged in the center, and at least five spirally rising swirl blades, the swirl blades are arranged around the central shaft of the impeller, and the impeller casing is fixed on In the swirl chamber, the inner edge of the swirl blade is fixed to the central axis of the impeller, the outer edge of the swirl blade is fixed to the impeller casing, and the air induction device communicates with the flue gas duct , the ash storage device is connected to the dry powder desulfurization agent injection device, and the gypsum preparation device is connected to the bottom of the multifunctional liquid collection pool.

A flue gas desulfurization system of the present invention includes a flue gas desulfurization tower, an ash storage device, a gypsum preparation device and an air induction device, and the ash storage device, the air induction device and the gypsum preparation device are all connected to the flue gas desulfurization tower, and the The flue gas desulfurization tower includes a tower body and a smoke exhaust device, a mist removal device, a swirl reaction device, a gas equalizer and a multifunctional liquid collection pool arranged from top to bottom along the tower body, and the multifunctional liquid collection pool It communicates with the cyclone reaction device through a slurry circulation system for pumping the reaction slurry into the upper part of the cyclone reaction device, the top of the demisting device is connected with the smoke exhaust device, and the cyclone reaction device The top of the device communicates with the bottom of the demisting device, the bottom of the cyclone reaction device communicates with the top of the gas homogenizing device, the gas homogenizing device communicates with the flue gas flue, and the flue gas flue is close to the homogenizing device. A dry powder inlet is provided at the gas device, and the dry powder inlet is connected to a dry powder desulfurizer injection device for spraying dry powder to the dry powder inlet. The inflow direction of the gas flow is consistent, and the multi-functional liquid collection pool is directly below the gas equalization device. The swirl flow reaction device includes a swirl flow outer shell and at least two swirl flow chambers arranged horizontally in the swirl flow outer shell. At least one cyclone is arranged horizontally in the cyclone chamber, the upper part of the cyclone chamber is provided with a circulating reaction slurry inlet, the lower part of the cyclone chamber is connected to the gas homogenization device, and the cyclone includes a horizontally arranged cyclone impeller, The swirl impeller includes an impeller casing arranged on the outer periphery, an impeller central shaft arranged in the center, and at least five spirally rising swirl blades, the swirl blades are arranged around the central shaft of the impeller, and the impeller casing is fixed on In the swirl chamber, the inner edge of the swirl blade is fixed to the central axis of the impeller, the outer edge of the swirl blade is fixed to the impeller casing, and the air induction device communicates with the flue gas duct , the ash storage device is connected to the dry powder desulfurization agent injection device, and the gypsum preparation device is connected to the bottom of the multifunctional liquid collection pool. When in use, the air induction device is used to introduce the flue gas into the flue gas flue and continuously deliver the flue gas to the flue gas flue to push the previous flue gas into the gas equalization device. The flue gas desulfurization tower is used for flue gas desulfurization, and the ash storage device is used to store dry powder desulfurization agents such as quicklime, and is injected into the flue gas flue through the dry powder desulfurization agent injection device connected to it to mix with flue gas for pre-desulfurization, while gypsum preparation The device is used to extract the reaction slurry containing a lot of sediment at the bottom of the connected multi-functional liquid collection pool to prepare desulfurized gypsum on the one hand, and to circulate the reaction slurry back to the multi-functional liquid collection pool for subsequent desulfurization reaction. When the flue gas that needs to be desulfurized is about to enter the gas homogenization device, dry powder desulfurization agent such as quicklime is sprayed from the dry powder desulfurization agent injection device, and the dry powder desulfurization agent is mixed with the flue gas in the flue gas flue for the first desulfurization, that is, pre-desulfurization. The pre-desulfurized flue gas carries unreacted dry powder desulfurization agent into the gas homogenization device, then enters the swirl flow reaction device for swirl desulfurization reaction, and then enters the demister device, and the desulfurized flue gas rising in the demist device gradually increases The first removal of the reaction slurry in the flue gas is to remove the fog. Since the dry powder desulfurization agent is pre-desulfurized, and then the swirling desulfurization of the desulfurization reaction slurry is performed, the flue gas and the desulfurization reaction slurry in the swirl desulfurization fully contact and fully react, and the desulfurization efficiency is higher. High, and after the dry powder desulfurizer is pre-desulfurized, the flue gas carries the dry powder desulfurizer into the gas homogenization device, and then enters the cyclone reaction device to contact with the water in the desulfurization reaction slurry to form a desulfurization reaction slurry with high desulfurization active ingredients, that is It plays the role of pulping, and part of the dry powder desulfurizer will fall into the multi-functional liquid collection pool by itself after entering the gas equalization device with the flue gas. This part of the dry powder desulfurizer and the upper layer of water or The desulfurization reaction slurry is prepared by contacting the water added from the water supply device, that is, it has a pulping effect in addition to desulfurization. When there is too much sediment in the multi-functional liquid collection tank, when the desulfurization agent in the desulfurization reaction slurry is insufficient, The sediment can be transported from the multifunctional liquid collection tank to the gypsum preparation device to prepare desulfurized gypsum, and the sprayed dry powder desulfurizer combines with the water in the reaction slurry to form a new reaction slurry with good activity of the desulfurizer, and the cleaning water or replenishment The water and the falling dry powder desulfurizer form a desulfurization reaction slurry for pulping. When the concentration of the desulfurizer is too high, the demisting device can be cleaned, so that the cleaning water carries the reaction slurry into the cyclone reaction device and then falls to the multi-functional liquid collection pool. Water can also be added through the water supply device alone, and the cleaning water or added water can be neutralized. The desulfurization reaction slurry with a high concentration of desulfurization active components reduces the concentration of effective desulfurization components in the desulfurization reaction slurry. Moreover, after the flue gas running at a certain flow rate enters the cyclone, it collides with the swirling blades. Since the flue gas is first changed by the swirling impeller of the cyclone, the flow direction is changed into a tornado-like swirling flue gas, flue gas and desulfurization reaction slurry. Stay and fully contact in the suspended swirl layer formed above the cyclone. Compared with the existing spray desulfurization device, the desulfurization reaction slurry is in full contact with the flue gas, which greatly improves the reaction efficiency, and the desulfurization effect and desulfurization efficiency are the least. It is 2-3 times the desulfurization of the spray desulfurization device, and the desulfurization is more thorough. The sulfur content in the flue gas after desulfurization is very small, and it is basically harmless to the environment. In this way, the pulping tank and the sedimentation tank are no longer needed, and a multi-functional liquid collection tank can realize pulping, circulating slurry and sedimentation slurry. It saves space and saves cost at the same time. The slurry can be recycled to save energy and protect the environment, and the desulfurization effect is better. Therefore, the flue gas desulfurization system of the present invention has the advantages compared with the prior art: simple structure, pre-desulfurization in the flue gas flue before performing flue gas desulfurization, and then performing swirl desulfurization reaction to improve flue gas Gas desulfurization effect and desulfurization rate, saving space, eliminating the need for pulping tanks and sinking tanks, facilitating later maintenance, low maintenance costs, and effectively saving energy and avoiding environmental pollution.

Another object of the present invention is to provide a method that utilizes the above-mentioned simple structure, performs pre-desulfurization in the flue gas flue before performing flue gas desulfurization, and then performs swirl desulfurization reaction to improve the flue gas desulfurization effect and desulfurization rate, The method of flue gas desulfurization by a flue gas desulfurization system that saves space, eliminates the need for pulping tanks and sinking tanks, is convenient for later maintenance, has low maintenance costs, and effectively saves energy and avoids polluting the environment.

A method for flue gas desulfurization of the present invention comprises the steps of:

A. The flue gas that needs to be desulfurized is transported to the flue gas flue through the air induction device, and then pushed to the gas equalization device by the follow-up flue gas. When approaching the gas homogenization device, the ash storage device delivers dry powder desulfurization agent to the dry powder desulfurization agent injection device , the dry powder desulfurizer injection device sprays the dry powder desulfurizer into the flue gas flue, and the dry powder desulfurizer is sprayed into the flue gas flue toward the gas homogenizing device, and the dry powder desulfurizer and the flue gas are mixed and reacted for pre-desulfurization;

B. After the pre-desulfurization of step A, the flue gas enters the gas equalization device, fills the gas homogenizer, and then enters each swirl chamber of the swirl reaction device. After passing through the swirl reactor in the swirl chamber, change its direction of movement It is a tornado-like swirling motion;

C. The slurry circulation system extracts the reaction slurry in the multifunctional liquid collection pool and transports it to the upper part of the swirl reaction device, and enters the swirl chamber from the upper part of each swirl chamber. The reaction slurry meets the high-speed swirling flue gas, and the two Interact and form a suspended swirl layer above the cyclone reactor under the action of the upward impact force of the flue gas. The flue gas and the reaction slurry fully contact, mix and react in the suspended swirl layer, that is, the swirl desulfurization reaction is carried out. When the reaction slurry keeps falling and the thickness of the suspension swirl layer is too large, part of the reaction slurry falls from the suspension swirl layer and passes through the swirl reactor, then falls into the multifunctional liquid collection pool through the gas equalization device and waits to be extracted by the slurry circulation system again. Desulfurization reaction with flue gas;

The flue gas after the cyclone desulfurization reaction in the D.C step continues to rise and enters the demisting device for demisting treatment, and the reaction slurry carried by the flue gas is removed;

The flue gas after the demisting treatment in the E.D step is discharged into the outside atmosphere through the exhaust device;

F. When there are many sediments in the multi-functional liquid collection pool, use the gypsum preparation device to extract the reaction slurry containing more sediments at the bottom of the multi-functional liquid collection pool to prepare desulfurized gypsum and output it. At the same time, the filtered reaction slurry is rotated and transported to the multi-functional The desulfurization reaction is carried out after circulation in the liquid collection tank. The flue gas after E.D step demisting treatment is discharged into the outside atmosphere through the exhaust device.

A method of flue gas desulfurization using it according to the present invention includes the above steps, so the air induction device introduces the flue gas into the flue gas flue and continuously sends the flue gas to the flue gas flue to push the previous flue gas to the uniform gas In the device, it is convenient for the subsequent desulfurization reaction. When the flue gas that needs to be desulfurized is about to enter the gas homogenization device, the dry powder desulfurization agent is delivered from the ash storage device to the dry powder desulfurization agent injection device, and the dry powder desulfurization agent injection device is injected into the flue gas flue. Spray into quicklime and other dry powder desulfurizers, dry powder desulfurizers are mixed with flue gas in the flue gas flue for the first desulfurization, that is, pre-desulfurization, and the pre-desulfurized flue gas carries part of the dry powder into the gas equalization device and then enters the cyclone reaction device , and then enter the demister device, the desulfurized flue gas rising in the demist device gradually clears the reaction slurry in the flue gas multiple times to perform demisting, because the dry powder desulfurizer is desulfurized in advance, and then desulfurized by the slurry, the desulfurization efficiency is higher , and after the dry powder pre-desulfurization, a part of the dry powder desulfurization agent is carried by the flue gas into the gas homogenization device, and then falls into the multi-functional liquid collection tank to facilitate the formation of desulfurization reaction slurry, that is, to complete the pulping. When there is too much sediment in the multifunctional liquid collection tank and the desulfurizing agent in the desulfurization reaction slurry is insufficient, the reaction slurry containing a large amount of sediment can be transported from the multifunctional liquid collection tank to the gypsum preparation device to prepare desulfurized gypsum, and sprayed into The dry powder desulfurizer is combined with the water in the reaction slurry to form a new reaction slurry with good activity of the desulfurizer, and the cleaning water or added water and the falling dry powder desulfurizer form a desulfurization reaction slurry for pulping, thereby improving the effective reaction slurry in the reaction slurry. Concentration of desulfurization components. When the concentration of the desulfurizer is too high, the demisting device can be cleaned so that the cleaning water carries the reaction slurry into the cyclone reaction device and finally falls into the multifunctional liquid collection pool. Water can also be added through the water supply device alone, cleaning water or added The water falls into the multifunctional liquid collection tank, so that the concentration of effective desulfurization components in the desulfurization reaction slurry is reduced. Moreover, after the flue gas running at a certain flow rate enters the cyclone, it collides with the swirling blades. Since the flue gas is first changed by the swirling impeller of the cyclone, the flow direction is changed into a tornado-like swirling flue gas, flue gas and desulfurization reaction slurry. Stay and fully contact in the suspended swirl layer formed above the cyclone. Compared with the existing spray desulfurization device, the desulfurization reaction slurry is in full contact with the flue gas, which greatly improves the reaction efficiency, and the desulfurization effect and desulfurization efficiency are the least. It is 2-3 times the desulfurization of the spray desulfurization device, and the desulfurization is more thorough. The sulfur content in the flue gas after desulfurization is very small, and it is basically harmless to the environment. In this way, the pulping tank and the sedimentation tank are no longer needed, and a multi-functional liquid collection tank can realize pulping, circulating slurry and sedimentation slurry. It saves space and saves cost at the same time. The slurry can be recycled to save energy and protect the environment, and the desulfurization effect is better. The gypsum preparation device extracts the reaction slurry with a lot of sediments to prepare desulfurization gypsum, and at the same time removes the reaction slurry from the sediments and then rotates and transports it to the multifunctional liquid collection tank for subsequent desulfurization reaction. Compared with the existing technology, it has the advantages of simple structure, pre-desulfurization in the flue gas flue before desulfurization, and then swirling desulfurization reaction to improve the desulfurization effect and desulfurization rate of flue gas. Save space, no longer need pulping tank and sinking tank, convenient for later maintenance, low maintenance cost, and effectively save energy and avoid environmental pollution.

Description of drawings

Fig. 1 is a schematic diagram of a flue gas desulfurization system in the prior art.

Fig. 2 is a schematic diagram of the flue gas desulfurization system of the present invention.

Fig. 3 is a side view of the cyclone reaction device in the flue gas desulfurization system of the present invention.

Fig. 4 is a top plan view of the swirl reaction device in the flue gas desulfurization system of the present invention.

Fig. 5 is a top plan view of the outer casing of the cyclone in the flue gas desulfurization system of the present invention.

Fig. 6 is a schematic cross-sectional view of the middle part of the cyclone chamber in the flue gas desulfurization system of the present invention.

Fig. 7A is a schematic diagram of the action force of the cyclone reactor in the flue gas desulfurization system of the present invention.

Fig. 7B is a schematic diagram of the force of another embodiment of the swirl reactor in the flue gas desulfurization system of the present invention.

Fig. 8 is a partial side view of the flue gas regulating device of the cyclone reaction device in the flue gas desulfurization system of the present invention.

Fig. 9 is a schematic diagram of the flue gas regulating device of the cyclone reaction device in the flue gas desulfurization system of the present invention.

Fig. 10 is a schematic diagram of the mist removal device in the flue gas desulfurization system of the present invention.

Fig. 11 is a partially enlarged view of the demisting device in Fig. 10 in the flue gas desulfurization system of the present invention.

Fig. 12 is a longitudinal sectional view of the mist removal device in the flue gas desulfurization system of the present invention.

Fig. 13 is an enlarged view of part H in Fig. 12 of the mist removal device in the flue gas desulfurization system of the present invention.

Fig. 14 is a partially enlarged view of the multifunctional liquid collection pool in Fig. 2 in the flue gas desulfurization system of the present invention.

Fig. 15 is a top view of the multifunctional liquid collection tank in the flue gas desulfurization system of the present invention.

Fig. 16 is a cross-sectional view of the multifunctional liquid collection pool in the flue gas desulfurization system of the present invention.

Fig. 17 is a side view of the multifunctional liquid collection tank in the flue gas desulfurization system of the present invention.

Fig. 18 is a schematic diagram of the gypsum preparation device in the flue gas desulfurization system of the present invention.

Description of figure number

1...Smoke exhaust device 2...Mist removal device 3...Flue gas desulfurization system

4...Air equalization device 5...Multifunctional liquid collection pool 6...Slurry circulation system

7...Flue gas flue 8...Dry powder desulfurization agent injection device 9...Gypsum preparation device

10...Solenoid control valve 11...Demister chamber 12...Demister

13...Demist blade 14...Demist cleaning device 15...Demist flushing pump

16...Mist removal tank 17...Rinse water main pipe 18...Rinse water branch pipe

19...Cleaning nozzle 20...Sump body 21...Aeration hole

22...Oxidation fan 23...Oxidation wind into the tower pipe 24...Oxidation aeration pipe

25...Oxidation air ring pipe 26...Aeration bracket 27...Stirrer

28...rotary driving device 29...stirring rotating shaft 30...stirring blade

31...Swirl outer casing 32...Swirl chamber 33...Swirl reactor

34...Circular reaction slurry inlet 35...Flip valve 36...Electric actuator

37...Conical expansion area 38...Smoke regulating cover 39...Open claw

40...Hinged shaft for flue gas adjustment 41...Hinged shaft support 42...Tower wall sealing device

43...Impeller housing 44...Swirl impeller 45...Central shaft of impeller

46...Swirling blade 47...Dry powder desulfurization agent injection pipe 48...Injection gun

49...fixed table 50...ash storage device 51...air induction device

52...Ash storage bin 53...Aeration gun 54...Gypsum discharge pump

55...gypsum slurry cyclone 56...vacuum belt filter

Detailed ways

A flue gas desulfurization system and a flue gas desulfurization method using it according to the present invention will be further described in detail below with reference to Fig. 2 to Fig. 18 of the accompanying drawings.

A kind of flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, comprise flue gas desulfurization tower, ash storage device 50, gypsum preparation device 9 and induced draft device 51, described ash storage device 50, induced draft device 51 and the gypsum preparation device 9 are all connected to the flue gas desulfurization tower, and the flue gas desulfurization tower includes a tower body and a smoke exhaust device 1, a mist removal device 2, a cyclone reaction device 3, Gas equalizer 4 and multifunctional liquid collection pool 5, between the multifunctional liquid collection pool 5 and the cyclone reaction device 3, pass through the slurry circulation system for pumping the reaction slurry into the upper part of the cyclone reaction device 3 6, the top of the mist removal device 2 is connected to the smoke exhaust device 1, the top of the cyclone reaction device 3 is connected to the bottom of the mist removal device 2, and the bottom of the cyclone reaction device 3 is connected to the The top of the gas equalizing device 4 is connected, and the gas homogenizing device 4 is in communication with the flue gas flue 7, and the flue gas flue 7 is provided with a dry powder inlet near the gas homogenizing device 4, and the dry powder inlet is connected to the The dry powder inlet is connected to a dry powder desulfurizing agent injection device 8 that sprays dry powder. The front end of the dry powder desulfurizing agent injection device 8 faces the inside of the gas equalization chamber 4 and is consistent with the inflow direction of the flue gas. Directly below the gas homogenizer 4 is The multifunctional liquid collection pool 5, the cyclone reaction device 3 includes a cyclone shell 31 and at least two cyclone chambers 32 arranged horizontally in the cyclone shell 31, and the cyclone chamber 32 is horizontal At least one cyclone 33 is set, the upper part of the cyclone chamber 32 is provided with a circulating reaction slurry inlet 34, the bottom of the cyclone chamber 32 communicates with the gas homogenizer 4, and the cyclone 33 includes a horizontally arranged cyclone impeller 44, the swirl impeller 44 includes an impeller housing 43 arranged on the outer periphery, an impeller central shaft 45 arranged in the center, and at least five spirally rising swirl blades 46, and the swirl blades 46 surround the impeller central shaft 45 Set, the impeller casing 43 is fixed in the swirl chamber 32, the inner edge of the swirl vane 46 is fixed to the central shaft 45 of the impeller, and the outer edge of the swirl blade 46 is fixed to the impeller casing 43. fixed, the air induction device 51 is connected with the flue gas flue 7, the ash storage device 50 is connected with the dry powder desulfurizer injection device 8, and the gypsum preparation device 9 is connected with the multifunctional liquid collection pool 5 The bottom is connected. In this way, when in use, the air induction device 51 is used to introduce the flue gas into the flue gas flue 7 and continuously deliver the flue gas to the flue gas flue 7 to push the previous flue gas into the gas equalizing device 4 . The flue gas desulfurization tower is used for flue gas desulfurization, and the ash storage device 50 is used to store dry powder desulfurization agents such as quicklime, and spray them into the flue gas flue 7 through the dry powder desulfurization agent injection device 8 connected to it to mix with flue gas for pre-desulfurization , and the gypsum preparation device 9 is used to prepare desulfurized gypsum on the one hand after extracting the reaction slurry containing more sediments at the bottom of the multifunctional liquid collection pool 5 connected with it, and on the other hand to circulate the reaction slurry back to the multifunctional liquid collection Pool 5 carries out the subsequent desulfurization reaction. The flue gas that needs to be desulfurized first enters the gas equalization device 4 from the flue gas flue 7, and after being filled with the gas homogenizer 4, enters the cyclone reaction device 3 upwards to perform the cyclone desulfurization reaction. Specifically, the flue gas enters the cyclone chamber 32, And through the swirl impeller 44 in the swirl chamber 32, its movement mode is changed to a centrifugal swirl motion similar to tornado type, and then the flue gas lifts up the desulfurization reaction slurry circulated from the multifunctional liquid collection pool 5 to the swirl chamber 32 And fully react with it for desulfurization, then the flue gas after the desulfurization reaction enters the mist removal device 2 from the swirl chamber 32 upwards to remove the reaction slurry carried by the flue gas, and the flue gas after the mist removal is discharged from the smoke exhaust device 1 to the atmosphere , and part of the reaction slurry after reacting with the flue gas in the swirl chamber 32 passes through the gas equalizer 2 and falls into the multifunctional liquid collection pool 5, and the reaction slurry with more sediments is deposited in the multifunctional liquid collection pool 5 At the bottom, the reaction slurry with less deposition is located at a relatively upper position in the multifunctional liquid collection pool 5. It waits to be extracted again by the slurry circulation device 6 and then circulates to the cyclone reaction device 3 for desulfurization reaction. When the multifunctional liquid collection pool 5 When a lot of sediment is deposited at the bottom, start the gypsum preparation device 9 to extract the reaction slurry containing a lot of sediment at the bottom from the bottom of the multifunctional liquid collection tank 5 and extract it to prepare desulfurized gypsum. In addition, when such a flue gas desulfurization device is in use, when the flue gas that needs to be desulfurized is about to enter the gas homogenizer 4, dry powder desulfurizers such as quicklime are sprayed from the dry powder desulfurizer injection device 8, and the dry powder desulfurizer and the flue gas flue 7 The flue gas inside is mixed for the first desulfurization, that is, pre-desulfurization. The pre-desulfurized flue gas carries unreacted dry powder desulfurization agent into the gas homogenization device 4, then enters the swirl reaction device 3 for swirl desulfurization reaction, and then enters the Demisting device 2, after the desulfurized flue gas rises in the demisting device 2, the liquid droplets in the flue gas are gradually cleared multiple times to perform demisting. Since the dry powder desulfurizer is desulfurized in advance, and then the swirling desulfurization of the desulfurization reaction slurry is performed, In cyclone desulfurization, the flue gas fully contacts and reacts with the desulfurization reaction slurry, and the desulfurization efficiency is higher, and the dry powder desulfurizer is pre-desulfurized first, and then the flue gas carries the dry powder desulfurizer into the gas equalization device 4, and then enters the cyclone reaction device 3 After contacting with the water in the desulfurization reaction slurry, a desulfurization reaction slurry with high desulfurization active ingredients is formed, that is, it plays the role of pulping, and a part of the dry powder desulfurizer will fall by itself after entering the gas equalization device 4 with the flue gas. In the functional liquid collection pool 5, this part of the dry powder desulfurizer contacts with the upper layer water in the multifunctional liquid collection pool 5 or the water added from the water supply device to prepare a desulfurization reaction slurry (desulfurization slurry, reaction slurry), that is, it removes the desulfurization effect In addition, there is a pulping function. When there is too much sediment in the multifunctional liquid collection pool 5 and the desulfurizing agent in the desulfurization reaction slurry is insufficient, the sediment can be transported from the multifunctional liquid collection pool 5 to the gypsum preparation device 9 Prepare desulfurized gypsum, and the sprayed dry powder desulfurizer combines with the water in the reaction slurry to form a new reaction slurry with good activity of the desulfurizer, and the cleaning water or added water forms a desulfurization reaction slurry with the falling dry powder desulfurizer for pulping , so that the concentration of effective desulfurization components in the desulfurization reaction slurry increases. When the concentration of the desulfurizer is too high, the demisting device 2 can be cleaned, so that the cleaning water carries the reaction slurry into the swirling flow reaction device 3 and then falls to the multifunctional liquid collection pool 5. Water can also be added through the water supply device alone, and the cleaning water or supplemented The water neutralizes the desulfurization reaction slurry with a high concentration of desulfurization active components, so that the concentration of effective desulfurization components in the desulfurization reaction slurry decreases. And after the flue gas of running with certain velocity enters cyclone 33, collides with swirl vane 46, because flue gas is changed into swirling flue gas like tornado by the swirl impeller 44 of flue gas at first, flue gas And the desulfurization reaction slurry stays and fully contacts in the suspended swirl layer formed above the cyclone 33 . Compared with the existing spray desulfurization device, the desulfurization reaction slurry in the desulfurization reaction device of the present invention is in full contact with the flue gas, so that the reaction efficiency is greatly improved, and the desulfurization effect and desulfurization efficiency are at least 2-3 times lower than those of the spray desulfurization device. times, the desulfurization is more thorough, the sulfur content in the flue gas after desulfurization is negligible, and it is basically harmless to the environment. In this way, the pulping tank and the sedimentation tank are no longer needed, and a multifunctional liquid collection tank 5 can realize pulping, circulating slurry and sedimentation slurry. It saves space and saves cost at the same time. The slurry can be recycled to save energy and protect the environment, and the desulfurization effect is better. And when the amount of flue gas entering the gas equalizing device 4 is not enough due to partial shutdown, maintenance and other uncontrollable factors in the production process of flue gas, that is, when the flue gas flow rate is too low, the control device located at the top of the swirl chamber 32 The flue gas flow regulating device closes part of the swirl chambers 32, and the rest of the swirl chambers 32 operate normally to ensure that the flue gas flow rate entering each swirl chamber 32 in operation is still within the predetermined range. Therefore, these several After the cyclone 33 in the swirl chamber 32 operates normally, it lifts the suspended swirl layer with a normal thickness range, thereby ensuring the desulfurization efficiency and desulfurization rate of the flue gas entering the swirl chamber 32, and ensuring that the suspended reaction slurry and The flue gas fully reacts to reduce the sulfur content in the flue gas after the desulfurization reaction. Therefore, a kind of flue gas desulfurization system of the present invention has the advantage compared with the prior art: simple in structure, can guarantee that flue gas and desulfurization reaction slurry fully react desulfurization, can carry out desulfurization treatment according to the need of entering the gas homogenizing device 4 The amount of flue gas selects the number of swirl chambers 32 that carry out desulfurization reaction on flue gas, and then effectively controls the flow rate of flue gas that enters the swirl chamber 32 for desulfurization reaction, ensures flue gas desulfurization effect and desulfurization rate, effectively saves energy and Avoid polluting the environment.

For a flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, it may also be: the front end of the dry powder desulfurization agent injection device 8 is set towards the direction of the gas equalizing device 4, Moreover, the angle between the injection direction of the front end of the dry powder desulfurizer injection device 9 and the inflow direction of the flue gas is an acute angle. In this way, the injected dry powder desulfurizer pushes the flue gas forward, and at the same time contacts with the flue gas as much as possible for desulfurization and is carried by the flue gas to the gas equalizing device 4 and other devices for operation. It is also possible that the dry powder desulfurization agent injection device 8 includes a dry powder desulfurization agent injection pipe 47 connected to an air gun 53 and an injection gun 48 arranged at the end of the dry powder desulfurization agent injection pipe 47, and the injection gun 48 is connected to the The dry powder desulfurizer injection pipe 47 is connected and fixed, the front part of the spray gun 48 passes through the dry powder inlet, the front part of the spray gun 48 extends into the flue gas flue 7, and the ash storage device is ash storage The ash storage bin 52 communicates with the inflatable gun 53 . Dry powder desulfurizers such as quicklime are stored in the ash storage bin 52 like this, and the dry powder desulfurizer in the ash storage bin 52 enters the air gun 53, and the dry powder desulfurizer is charged into the dry powder desulfurizer injection pipe 47 under the action of the air gun 53 compressed air and makes The dry powder desulfurizer is directly sprayed from the front end of the injection gun 48 into the flue gas flue 7 and mixed with the flue gas for pre-desulfurization treatment. The front end of the spray gun 48 extends into the flue gas flue 7 through the dry powder inlet to ensure that the dry powder desulfurizer directly acts on the flue gas, preventing the dry powder desulfurizer from running out of the flue gas flue 7, causing waste of the dry powder desulfurizer and affecting the overall performance. Desulfurization effect and flue gas desulfurization rate. A further preferred technical solution is that a fixed platform 49 is arranged between the spray gun 48 and the dry powder inlet, the fixed platform 49 is fixed on the flue gas flue 7, and the middle and lower part of the fixed platform 49 is connected to the The dry powder inlet is connected, and the front end of the spray gun 48 is inserted into the fixed platform 49 and sealed and fixed on the fixed platform 49 . In this way, the middle and lower part of the fixed table 49 communicates with the dry powder inlet, the fixed table is fixed on the flue gas flue, and the front end of the spray gun is inserted into the fixed table and sealed and fixed on the fixed table 49, ensuring that the front end of the spray gun 48 directly sprays the dry powder desulfurizer into the flue gas Inside the flue 7. The advantage is that it is firmly fixed, the injection gun 48 will not fall, and the dry powder desulfurizer will not run out of the flue gas flue 7, so as to ensure the progress of the flue gas pre-desulfurization reaction, and effectively ensure the flue gas desulfurization effect and flue gas desulfurization rate.

A flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, it can also be: the gypsum preparation device 9 includes a gypsum discharge pump 53, a gypsum slurry cyclone 45 and A vacuum belt filter 55, the gypsum discharge pump 53 communicates with the bottom of the multifunctional liquid collection pool 5, the gypsum slurry cyclone 54 communicates with the gypsum discharge pump 53, and the gypsum slurry cyclone 54 A gypsum outlet and the reaction slurry outlet are provided, the gypsum slurry cyclone 54 gypsum outlet communicates with the vacuum belt filter 55, the gypsum slurry cyclone 54 reaction slurry outlet is connected to the multifunctional liquid collection The upper part of the pool 5 is connected. In this way, the gypsum discharge pump 53 extracts the reaction slurry containing more deposits at the bottom of the multifunctional sump 5 and transports it to the gypsum slurry cyclone 54, and the swirl action through the gypsum cyclone 54 makes the reaction slurry in the reaction slurry The sediment is separated from the liquid reaction slurry to prepare desulfurized gypsum. At the same time, the reaction slurry from which the sediment is separated is sent back to the multifunctional liquid collection pool 5 through the circulation pipeline to continue circulation and desulfurization. It can also be that the air induction device is the main induced fan, and the main induced fan is used to convey the flue gas into the flue gas flue 7 .

A flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, it can also be: there are at least two swirl chambers, and at least one of the swirl chambers 32 is at the top A flue gas flow regulating device capable of opening and closing the top of the swirl chamber 32 is provided, and the flue gas flow regulating device is connected to the top of the swirl chamber 32 . And when the amount of flue gas entering the gas equalizing device 4 is not enough due to partial shutdown, maintenance and other uncontrollable factors in the production process of flue gas, that is, when the flue gas flow rate is too low, the control device located at the top of the swirl chamber 32 The flue gas flow regulating device closes part of the swirl chambers 32, and the rest of the swirl chambers 32 operate normally to ensure that the flue gas flow rate entering each swirl chamber 32 in operation is still within the predetermined range. Therefore, these several After the cyclone 33 in the swirl chamber 32 operates normally, it lifts the suspended swirl layer with a thickness within the normal range, thereby ensuring the desulfurization efficiency and desulfurization rate of the flue gas entering the swirl chamber 32, and ensuring the suspended reaction slurry Fully react with the flue gas, reduce the sulfur content in the flue gas after the desulfurization reaction. In addition, the swirler 33 is a swirl impeller 44 composed of horizontally arranged spiral blades. During the upward impact, the flue gas encounters the spirally rising swirl blade 46 of the swirl impeller 44 and then moves upward tangentially to change direction. At the same time, due to the centrifugal force, the smoke forms a spiral tornado shape. A more preferred technical solution is that the swirl blades are arc-shaped, which is consistent with the shape of the blades in the ventilation fan or the electric fan. A further preferred technical solution is: the flue gas flow regulating device includes a flue gas regulating cover 38 capable of opening and closing the swirl chamber 32 and an opening and closing cover device connected to the flue gas regulating cap 38, the opening and closing The cover closing device is respectively connected with the flue gas regulating cover 38 and the top of the swirl chamber 32, and the opening and closing cover device is connected with the control system. The function of the flue gas regulating cover 38 is to close the swirl chamber 32 after being closed, which is equivalent to making the swirl chamber 32 no longer participate in the desulfurization reaction, and when it is in the open state, it is equivalent to the swirl chamber 32. The top is empty without any shelter, so that the flue gas after the swirl desulfurization reaction in the swirl chamber 32 enters the demisting device 2 from the top of the swirl chamber 32, and the flue gas in the gas equalizing device 4 can enter the swirl chamber 32 to carry out desulfurization reaction to ensure that the flue gas can undergo desulfurization reaction. The function of the opening and closing cover device is to open or close the smoke regulating cover 38 and then open or close the swirl chamber 32 . The control system is used to control the action of the opening and closing cover device to open or close the smoke regulating cover 38 . On the basis of the previous technical solution, it is also possible that: the opening and closing cover device includes a swing arm fixed to the swing arm rotation axis and a swing arm driving device, and the distal end of the swing arm is fixed on the smoke regulating cover 38, so The proximal end of the swing arm is fixed to the rotation shaft of the swing arm, the rotation shaft of the swing arm is connected to the driving device of the swing arm, and the driving device of the swing arm is connected to the control system. When such an opening and closing cover device is in use, the swing arm driving device drives the swing arm rotation shaft to rotate forward, and the swing arm rotation shaft drives the swing arm to rotate forward, so that it moves horizontally, and finally removes the top position above the swirl chamber 32 , and then open the swirl chamber 32, that is, open the swirl chamber 32 to carry out the desulfurization reaction. And when the swing arm driving device drives the rotation shaft to rotate in reverse, the swing arm rotation shaft drives the swing arm to rotate in reverse, so that the swing arm moves horizontally and then moves to the top of the swirl chamber 32 and closes the space of the swirl chamber 32, the swirl chamber 32 It is in a closed state, that is, the swirl chamber 32 is closed, and the flue gas entering the swirl chamber 32 will no longer undergo desulfurization reaction and the flue gas cannot be discharged to the demister device 2. The opening and closing cover device with such a structure realizes flue gas regulation Opening and closing of cover 38. A further preferred technical solution is that the swing arm driving device is connected to the electric actuator 36, and the electric actuator 36 is connected to the control system. In this way, the control system controls all the electric actuators 36 according to the flow and velocity of the flue gas entering the gas equalizing device 4. Some electric actuators 36 do not operate, and the swing arm driving device connected thereto does not operate, and the swing arm remains open. That is, the swirl chamber 32 can carry out normal desulfurization reaction when it is in the open state, while some electric actuators 36 are running, and the swing arm drive device connected to it is running, moving the swing arm horizontally, so that the flue gas regulating cover 38 is covered on the swirl flow chamber. On the chamber 32, the cyclone chamber 32 is closed so that it cannot participate in the desulfurization reaction. Furthermore, the number of swirl chambers 32 for desulfurization reaction can be controlled according to the amount of flue gas entering and the flue gas flow rate, thereby ensuring desulfurization efficiency and desulfurization rate. It is also possible that the opening and closing cover device includes an opening claw 39 fixed on the upper surface of one end of the smoke regulating cover 38, the other end of the smoke regulating cover 38 is hinged on the top of the swirl chamber 32, and the opening claw 39 is connected with electric actuator 36. In this way, the electric actuator 36 starts to run, and the opening claw 39 is turned upwards. Since one end of the smoke regulating cover 38 is hinged on the top of the swirl chamber 32, the opening claw 39 drives the other end of the smoke regulating cover 38 around it. The hinge shaft or hinge point with the top of the swirl chamber 32 is turned upwards, and then the top of the swirl chamber 32 is opened, and the swirl chamber 32 can carry out desulfurization reaction. On the contrary, the electric actuator 36 runs in the reverse direction and turns the opening claw 39 downwards. Since one end of the smoke regulating cover 38 is hinged on the top of the swirl chamber 32, the opening claw 39 drives the other end of the smoke regulating cover 38 to rotate When it and the flue gas regulating hinge shaft 40 or hinge point on the top of the swirl chamber 32 are turned downwards, the flue gas regulating cover 38 is covered on the top of the swirl chamber 32, the swirl chamber 32 is closed, and the swirl chamber The chamber 32 does not carry out desulfurization reaction, but the flue gas regulating hinge shaft 40 is erected on the hinge shaft support 41, and then the number of swirl chambers 32 for desulfurization reaction can be controlled according to the amount of flue gas entering and the flue gas flow rate, and then Ensure desulfurization efficiency and desulfurization rate. In addition, the end of the electric actuator 36 is located outside the swirl chamber 32 , its head end is inserted into the swirl chamber 32 , and a tower wall sealing device 42 is provided at a position in contact with the swirl chamber 32 . This ensures that no flue gas leakage occurs when the swirl chamber 32 is closed. It may also be that the flue gas flow regulating device includes a flap valve 35 arranged on the top of the swirl chamber 32 and an electric actuator 36 connected to the flap valve 35, and the size of the flap valve 35 is larger than the flap valve 35. The size of the top of the cyclone chamber 32. In this way, the flap valve 35 can close the swirl chamber 32 , and the swirl chamber 32 can be opened or closed by the electric actuator 36 running and flipping the flap valve 35 . Furthermore, the number of swirl chambers 32 for desulfurization reaction can be controlled according to the amount of flue gas entering and the flue gas flow rate, thereby ensuring desulfurization efficiency and desulfurization rate.

A flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, it can also be: the tops of the swirl blades 46 are all arc-shaped, and the tops of the swirl impellers 44 are The surface forms an arc body with a low middle and a high peripheral height. In this way, the arc shape of the top of the swirl blade 46 makes the flue gas avoid directly hitting the inner wall of the impeller casing 43 or the swirl chamber 32 when the flue gas changes its flow direction, and slides over the impeller casing 43 or the inner wall of the swirl chamber 32 in a rotary manner in the direction of rotation, as far as possible. It is possible to avoid impact or direct collision with the impeller casing 43 or the inner wall of the swirl chamber 32 to consume the kinetic energy of the flue gas, thereby effectively avoiding the reduction of the flue gas flow rate, avoiding the consumption of the kinetic energy of the flue gas as much as possible, and effectively ensuring the suspension reaction that the flue gas can hold up The thickness of the swirling layer of the slurry should be as large as possible, so that the sulfur dioxide in the flue gas can fully contact and react with the effective desulfurization components in the desulfurization reaction slurry, so as to ensure that the desulfurization reaction between the two is more thorough and the sulfur dioxide in the flue gas can be removed as much as possible, effectively improving the flue gas. The gas desulfurization efficiency is improved, and the flue gas is prevented from impacting the impeller shell 43 and the inner wall of the swirl chamber 32, effectively prolonging the service life of the swirler 33 and the swirl chamber 32, reducing maintenance costs, and further reducing production costs. On the basis of the technical solution described above, it may also be: the top edge of each swirl vane 46 is a gradually raised arc edge from the impeller central shaft 45 to the impeller shell 43 . In this way, the gradually rising arc-shaped edge ensures that the flue gas flow encounters as few obstacles as possible, and its movement is smoother, reducing the kinetic energy consumption of the flue gas, further improving the flue gas desulfurization efficiency and desulfurization effect, and reducing the sulfur in the flue gas as much as possible. content. A further preferred technical solution is that the swirl vanes 46 are arranged at equal intervals between the impeller central shaft 45 and the impeller casing 43 . In this way, the area where the flue gas hits each swirl vane 46 is more uniform, so that the uniformity of the centrifugal swirling flow of the flue gas is higher, further avoiding the consumption of kinetic energy in the flue gas, and further increasing the suspension of the desulfurization reaction slurry that the flue gas can support The thickness of the swirl layer can further improve the flue gas desulfurization effect and desulfurization efficiency. On the basis of the previous technical solutions, the height of the impeller central shaft 45 is less than the height of the impeller casing 43, the lower half of the impeller central shaft 45 is a cylinder, and the upper half of the impeller central shaft 45 It is a cone, the top of the lower half is butted with the bottom of the upper half or integrally formed, and the height of the lower half is consistent with the height of the inner side of the swirl vane 46 . In this way, when the flue gas passes through the impact of the swirl vane 46, it is in the process of centrifugal rotation, the flue gas in the central part is in contact with the cone, and the more upward the contact with the cone is, the less the impact is, and the smoke is effectively reduced. Kinetic energy loss of gas. At the same time, since the height of the central shaft 45 of the impeller is greater than the height of the inner edge of the swirl vane 46, the fixation of the swirl vane 46 is more firm.

A flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, it may also be: the top of the cyclone chamber 32 is provided with an expansion area 37 that expands upwards and outwards, so The expansion area 37 is arranged around the upper part of the swirl chamber 32 , and the size of the outer edge of the top of the expansion area 37 is larger than that of the outer edge of the bottom of the expansion area 37 . In this way, when the flue gas reaches the upper part of the cyclone chamber 32 and has not yet reached the demister device 2, since the top outer edge size of the expansion area 37 provided on the upper part of the cyclone chamber 32 is larger than the bottom outer edge size of the expansion area 37, it will carry desulfurization. The flue gas of the reaction slurry diffuses outwards and upwards after entering the expansion area 37. Since the area of the expansion area 37 is larger than the middle and lower parts of the swirl chamber 32, the flow rate of the flue gas decreases due to the increase in the area during the diffusion process, and then The stay time above the swirl chamber 32 and in the demist device 2 connected to the top of the swirl chamber 32 is longer, and during the stay time, the flue gas and the desulfurization reaction slurry carried and the reacted substances are fully Contact, further desulfurization and facilitate the fall of the reaction slurry carried in the flue gas, so that the subsequent demisting device 2 has a better demisting effect, the overall demisting rate is relatively high, and the sulfur content in the flue gas discharged to the outside is as small as possible, and When the flue gas enters the mist removal device 2, part of the reaction slurry has already fallen, so the mist removal device 2 is not easy to block, effectively prolonging the service life of the mist removal device 2 and the swirl chamber 32, reducing maintenance costs, and reducing the overall desulfurization cost , to avoid polluting the environment. Compared with the prior art, the advantages are: simple structure, sufficient reaction desulfurization of the flue gas and the desulfurization reaction slurry, which is beneficial to the diffusion of the flue gas carrying the reaction slurry, reducing the flow rate of the flue gas, and beneficial to the environment with sediment The reaction slurry falls to prevent the demisting device 2 from being blocked, and improves the demisting efficiency and demisting effect of the flue gas after desulfurization. A further preferred technical solution is that the expanded area 37 is in the shape of a truncated cone or a truncated cone. The advantage of such a shape of the expansion area 37 is that it is easy to manufacture and shape, and it avoids dead angles that hinder the expansion of smoke. The reaction slurry carried by the flue gas is in contact with the wall of the expansion area 37, which facilitates the reaction slurry to come out and slide down, and the shape of the frustum of the cone and the frustum of the cone ensures that when the flue gas enters the upper part of the cyclone chamber 32 and diffuses, the area becomes larger as it goes upward. The flue gas flow rate is gradually reduced, the defogging effect is good, and the defogging device 2 is not easy to be blocked. It is also possible that the expansion area 37 is in the shape of a bell mouth. The advantage of the bell mouth shape is that it is easy to manufacture and shape, and it avoids dead angles that hinder the expansion of smoke. The reaction slurry carried by the flue gas is in contact with the wall of the expansion area 37, which facilitates the reaction slurry to drop from the flue gas, and the shape of the frustum of the cone and the frustum of the cone ensures that when the flue gas enters the upper part of the swirl chamber 32 and diffuses, it is more upward. The larger the , the flue gas flow rate is gradually reduced, the demisting effect is better, and the demisting device 2 is not easy to be blocked. A further preferred technical solution is that the angle between the outer wall of the expansion area 37 and the outer wall of the swirl chamber 32 is 120°-150°. In this way, the smoke diffusion effect is relatively good, and the smoke flow rate will not be reduced to an excessively low level, so that the defogging smoke flow rate of the subsequent demisting device 2 is not enough, resulting in a poor demisting effect. If the included angle is less than 120°, the opening of the expanded area 37 is too large, and the smoke flow rate may decrease rapidly, which is not conducive to the subsequent demisting. The air flow rate is not significantly reduced, and the demisting effect is not good.

A flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, it can also be: the demister device includes a demist chamber 11, a demister 12 and a demist cleaning device 14, the demister 12 is at least two, the demister 12 and the demister cleaning device 14 are horizontally arranged in the demister chamber 11, each of the demister 12 Corresponding to at least one of the demisting and cleaning devices, at least thirty-six demisting blades 13 are arranged at equal intervals in each of the demisters 12 , and the longitudinal cross-sectional shape of the demistering blades 13 is S-shaped. In this way, when in use, the flue gas enters the demister chamber 11, the flue gas carrying the reaction slurry passes through the demister 12, first touches the bottom of the S-shaped demister blade 13, and then the reaction in the flue gas hits the demist blade 13 It is blocked and falls along the S-shaped demister blade 13, and the flue gas after removing this part of the reaction slurry moves upward from the gap between the two demist blades 13, and during the operation of the flue gas, due to the demist blade The cross-section of 13 is S-shaped, so when the flue gas rises along the gap, the flue gas still carrying the desulfurization reaction slurry will contact the S-shaped demisting blade 13 at least three to four times, and the three to four times with the demisting blade 13 During the collision process, more desulfurization reaction slurry is separated from the flue gas and falls along the S-shaped defogging blade 13, and then the flue gas and desulfurization reaction slurry are separated at least three to four times, increasing the desulfurization reaction slurry removal amount by three to four times , that is to increase the defogging efficiency and defogging effect. And because the desulfurization reaction slurry is repeatedly removed, and all slides down along the smooth S-shaped mist removal blades 13, the bottommost end of the gap between the S-shaped mist removal blades 13 for the desulfurization reaction slurry removed in batches in the flue gas is still It has a certain scouring effect, avoids the bottom or internal blockage of the demister 12, reduces cleaning times, saves costs, prolongs the working time of the demister 12, and the working life of the demister 12 is longer. On the basis of the technical solution described above, it may also be that: the cross-sectional shape of the defogging blade is provided with a hook extending in the opposite direction of the bend at the bend of the curve. This further increases the probability that the flue gas carrying the desulfurization reaction slurry hits the defogging blade, and blocks the desulfurization reaction slurry as much as possible. The defogging effect is better. A further preferred technical approach is that each of the demisters 12 is horizontally arranged parallel to each other, and the outer wall of the demister 12 is fixedly connected with the inner wall of the demister chamber 11 . The advantage of installing the demister 12 in this way is that there is no dead angle for demisting, the overall demisting process is relatively uniform, and the smoke emission after demisting is relatively uniform and the flow rate is uniform. A further preferred technical solution is that the distance between the defogging blades 13 is 2cm-3.5cm. If the distance between the defogging blades 13 is too large, the number of times that the flue gas enters the defogging blades 13 of the mist eliminator 12 collides with the defogging blades 13 is relatively small, and the defogging effect is not good. If the distance between them is too small, the flue gas enters the gap between the defogging blades 13 of the mist eliminator 12 and collides more, and the defogging effect is quite good. Slow down, although the defogging effect is obvious, but it hinders the subsequent smoke defogging, so that a large amount of smoke gathers in the defogging chamber 11, affecting the overall defogging efficiency, and due to the gap between adjacent defogging blades 13 If the distance is too small, after the desulfurization reaction slurry separates from the flue gas, the demisting blade 13 will gather, slide and scour through interaction, making the scour effect not obvious, and the interaction between the removed desulfurization reaction slurry and the upwardly moving flue gas will easily lead to clogged. It can also be that: the demist cleaning device includes a flushing water main pipe 17 connected to the demisting flushing water pump 15 and the demisting water tank 16 and a flushing water branch pipe 18 connected to the flushing water main pipe 17, and the flushing water main pipe 17 protruding into the demister chamber 11 is horizontally provided with at least three layers of flushing water branch pipe assemblies, two layers of flushing water branch pipe assemblies are arranged between the adjacent demisters 12, and a lowermost layer of demister 12 is provided below Each layer of flushing water branch pipe assembly, each layer of said flushing water branch pipe assembly includes at least three said flushing water branch pipes 18, each of said flushing water branch pipes 18 is provided with at least three cleaning nozzles 19, each of said flushing water branch pipes 18 Electromagnetic control valves 10 are arranged on them, and the electromagnetic control valves 10 are all connected to the controller. The demisting water tank 16 is used to supply the water used for cleaning the demister 12 in the demisting chamber 11, and the function of the demisting flushing water pump 15 is to pump water out of the demisting water tank 16 and inject it into the flushing water main pipe 17 , the flushing water main pipe 17 sends the flushing water to each horizontal layer through the branched flushing water branch pipe 18, and then under the action of the electromagnetic control valve 10, the demister 12 is cleaned upward or downward according to the control signal. Since at least two demisters 12 are included, in order to facilitate flushing of the demisters 12, and since there are inlets and outlets on the upper and lower sides of the demister 12, at least three layers are set when the demister cleaning device is set, that is, separate The positions where the desulfurization reaction slurry is the most need to be set, that is, two layers of flushing water branch pipe assemblies are set between adjacent demisters 12, and another layer of flushing water branch pipe assemblies is installed under the bottom demister 12. The flushing of each layer The water branch pipe assembly includes at least three flushing water branch pipes 18, and a plurality of cleaning nozzles 19 on the flushing water branch pipes spray flushing water on the upper and lower ends of the demister 12, and the desulfurization reaction of the upper and lower ends bonded to the surface of the demister blade 13 The slurry is scoured to avoid clogging of the demister 12 . And all be provided with electromagnetic control valve 10 on each flushing water branch pipe 18, and electromagnetic control valve 10 is all connected with controller, can control the water supply on each flushing water branch pipe 18 respectively like this, and in the prior art is flushing A high-power solenoid valve is installed outside the water main pipe. The opening and closing time of such a solenoid valve is relatively long, the response is relatively slow, and it consumes more water and electricity. And on each flushing water branch pipe 18 among the present invention, the electromagnetic control valve 10 of low power is separately set, and the operating stroke of the electromagnetic control valve 10 of low power is short, can select to carry out separate flushing, so more save water, save cost. A further preferred technical solution is that the cleaning nozzle 19 is a solid cone nozzle. The advantage of using a solid cone nozzle is that the nozzle itself is not easy to block, and its spray is a fan-shaped spray, and the hitting ability of the spray is relatively strong. The cleaning effect of the demister 12 is relatively good, and the service life is long. cost. It can also be that the spraying direction of the cleaning nozzles 19 provided on the upper flushing water branch pipe 18 arranged between the adjacent demisters 12 faces the above described demister 12, and the cleaning nozzles 19 provided on the lower flushing water branch pipe 18 The spraying direction faces the demister 12 arranged below, and the spraying direction of the cleaning nozzle 19 provided on the flushing water branch pipe 18 provided below the bottom demister 12 faces the demister 12 arranged above it. In this way, the upper and lower ends of the demister 12 can be fully cleaned to prevent the upper and lower ends of the demister 12 from being blocked. It is also possible that the flushing water branch pipes 18 of each layer extend horizontally along the radial direction of the demister chamber 11 and extend horizontally in a direction consistent with the extending direction of the demister 12 . In this way, since the demister 12 is arranged horizontally, each layer of flushing water branch pipes 18 extends horizontally in the radial direction to ensure that the nozzle force on each flushing water branch pipe 18 is more uniform, and the cleaning effect is better. When the mist removal chamber 11 and the mist eliminator 12 are all circular, the flushing water branch pipe 18 extends horizontally in the radial direction, and if the mist removal chamber 11 and the mist eliminator chamber 12 are all rectangular or square, the flushing water branch pipe 18 Extend horizontally along the same direction as the extending direction of the demister 12 .

A flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, it can also be: the multifunctional liquid collection pool includes a liquid collection pool body 20, and the liquid collection pool body 20 An aeration device is arranged inside, the bottom of the sump body 20 is connected to the gypsum preparation device 9, the interior of the sump body 20 is provided with reaction slurry, and the sump body 20 communicates with the outside world through the slurry circulation system 6 , the agitator 27 is arranged in the liquid collection tank body 20, and the aeration device includes at least two aeration function ends, and the aeration function ends extend into the liquid collection tank body 20, and the aeration device The functional end is inserted into the liquid collecting tank body 20 through the side wall of the liquid collecting tank body 20, the aeration functional end is inserted into the reaction slurry from top to bottom, and the inside of the aeration functional end is hollow and The aeration functional end has an aeration hole 21 at least at its bottom end, and the aeration hole 21 is located in the reaction slurry. In this way, when in use, the liquid collecting tank body 20 can be used not only as a pulping tank, but also as a circulation tank, and can also be used as a sedimentation tank at the same time, and the aeration function end of the aeration device is inserted into the liquid collecting tank body 20, It is inserted into the reaction slurry from top to bottom (in the desulfurization reaction device, the reaction slurry is desulfurization reaction slurry, which may be called desulfurization slurry), and it has at least an aeration hole 21 at the bottom, and the aeration hole 21 is under pressure. Under the action of the external air, the external air is sucked in and the bubbles are continuously blown out. During the rising process, the bubbles aerate the reaction slurry with different heights and different concentrations. Specifically: the reaction equation in the aeration process is: :

HSO ₃ ^- +1/2O ₂ →HSO ₄ ^- →H ⁺ +SO ₄ ^2-

SO ₃ ^2- +1/2O ₂ →SO ₄ ^2-

Ca ²⁺ +SO ₄ ^2- +2H ₂ O→CaSO ₄ 2H ₂ O

The bubbles blown out of the aeration hole 21 aerate the reaction slurry to promote the oxidation of the reaction slurry, and promote the conversion of calcium sulfite in the reaction slurry into calcium sulfate, and the calcium sulfate crystallizes into calcium sulfate dihydrate, that is, desulfurized gypsum. The aeration efficiency of the aeration device is higher, the oxidation rate of the reaction slurry is higher, the desulfurization effect is better, and the purity of the gypsum produced is higher. A further preferred technical solution is that the aeration device includes an oxidation blower 22 for extracting air, at least two oxidation air inlet tower pipes 23 and at least two oxidation aeration pipes 24, and the oxidation air inlet tower pipe 23 is connected with the oxidation air inlet tower pipe 23. The oxidation aeration pipes 24 have the same number and corresponding positions, and the aeration function end includes the oxidation air inlet tower pipe 23 and the oxidation aeration pipe 24, and the oxidation air inlet tower pipe is connected with the oxidation fan 22 , the oxidation air inlet tower pipe 23 is inserted into the liquid collection tank body 20 from the side wall of the liquid collection tank body 20, and the bottom of the oxidation air inlet tower pipe 23 communicates or is integrated with the top of the oxidation aeration pipe 24 Shaped, the aeration holes 21 are opened at least at the bottom of the oxidation aeration pipe 24 . The function of the oxidation blower 22 is to pump air into the liquid collection tank body 20, the oxidation wind inlet tower pipe 23 is connected with the oxidation aeration pipe 24 for use or the two are integrally formed, and the oxidation wind inlet tower pipe 23 is connected with the oxidation fan 22, which is convenient The outside air is sucked into the tower pipe 23 by the oxidation blower 22, and then enters the oxidation aeration pipe 24, and then blows out air bubbles through the aeration holes 21 at least at the bottom of the oxidation aeration pipe 24 and enters the reaction slurry, so that The reaction slurry is fully aerated to improve the aeration efficiency and the oxidation rate of the reaction slurry. At the same time, due to the continuous suction of air, the air is continuously blown out from the 21 aeration holes under pressure, so the 21 aeration holes are guaranteed The pressure is always kept greater than the pressure of the reaction slurry, so the aeration holes 21 are not easily blocked. Of course, it can also be an aeration device with other structures, as long as the aeration function end is inserted into the reaction slurry from top to bottom, and the aeration hole 21 is at least set at the bottom end. A further preferred technical solution is that the oxidation fan 22 communicates with each of the oxidation wind inlet tower pipes 23 through an oxidation wind ring pipe 25, and the oxidation wind ring pipe 25 surrounds the side outer wall of the liquid collection tank body 20 Setting, the head end of the oxidizing wind ring pipe 25 is connected with the oxidation fan 22, one end of the oxidizing wind inlet tower pipe 23 communicates with the oxidizing wind ring pipe 25, and the other end of the oxidizing wind inlet tower pipe 23 It communicates with the top of the corresponding oxidation aeration pipe 24 . That is, one end of an oxidation air ring pipe 25 arranged around the entire liquid collection pool body 20 or around the outer wall of the liquid collection pool body 20 is connected to the oxidation fan 22, and the air sucked by the oxidation fan 22 enters the oxidation wind ring pipe 25. , and then a plurality of oxidizing air inlet tower pipes 23 enter into each oxidizing air inlet tower pipe 23 through the ends communicated with the oxidizing air ring pipe 25, and then enter the reaction slurry through the oxidation aeration pipe 24 for aeration. The advantage is that only one oxidation blower 22 is required to simultaneously transport and control multiple oxidation air inlet tower pipes 23 arranged around the side wall of the liquid collection tank body 20, thereby providing air for each oxidation aeration pipe at the same time, saving costs, and Effectively save space, while ensuring high aeration efficiency and high oxidation rate of reaction slurry. It can also be that: the oxidation aeration pipe 24 is vertically arranged in the liquid collection tank body 20 , and the oxidation aeration pipe 24 is fixed on the inner wall of the liquid collection tank body 20 through an aeration bracket 26 . In this way, the oxidation aeration pipe 24 is fixed by the aeration bracket 26, so that the vertical arrangement of the oxidation aeration pipe 24 is more stable, and shaking is avoided during the aeration process to affect the aeration efficiency and the oxidation rate of the reaction slurry. On the basis of the technical solution described above, the aeration hole can also be opened at the bottom end of the oxidation aeration pipe 24, and the oxidation aeration pipe 24 has at least one aeration hole along its longitudinal extension direction from top to bottom. holes 21 , the sum of the cross-sectional areas of all the aeration holes 21 is smaller than the cross-sectional area of the oxidation aeration pipe 24 . In this way, not only bubbles bulge out from the aeration holes 21 opened at the bottom, but also bubbles bulge out from the aeration holes 21 arranged from top to bottom, because the cross-sectional area of all aeration holes 21 is smaller than the overall oxidation The cross-sectional area of the aeration pipe 24, therefore, the pressure of the sucked air is still greater than the pressure and impact force of the reaction slurry, and the bubbles are constantly in contact with the reaction slurry in the process of rising, oxidizing the effective substances in the reaction slurry, and ensuring exposure The stomata 21 will not be blocked, the aeration efficiency is improved, and the oxidation rate of the reaction slurry is improved. It is also possible that all the aeration functional ends are inserted and arranged in the liquid collection tank body 20 at equal angles or at equal intervals. That is, the included angles between multiple aeration function ends are the same. If three aeration function ends are set around, the angle between two adjacent aeration function ends is 120°. If four aeration function ends are set around end, then the angle between two adjacent aeration function ends is 90°. And if the liquid collection tank body 20 is square, then the aeration function ends are arranged around the liquid collection tank body 20 at equal intervals. The advantage of setting the aeration function ends at equal intervals or equal angles is that the liquid collection tank can be divided into equal action areas, and the effect of each aeration function end in its action area is as uniform as possible, that is, multiple aeration function ends can be as uniform as possible. It is possible to aerate the reaction slurry in the entire liquid collection tank body 20 as evenly as possible, so as to improve the aeration efficiency and the oxidation rate of the reaction slurry.

A flue gas desulfurization system of the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, it may also include: a liquid collection pool body 20, an aeration device is arranged in the liquid collection pool body 20, The bottom of the sump body 20 is connected to the gypsum preparation device 9, the interior of the sump body 20 is provided with a reaction slurry, the sump body 20 communicates with the outside world through the reaction slurry circulation system 6, the sump body The main body 20 is provided with an agitator 27, the agitator 27 is obliquely arranged on the side wall of the liquid collection pool body 20, the stirring end surface of the agitator 27 is parallel to or has a gap between the side wall of the liquid collection pool body 20 The included angle is an acute angle or an obtuse angle, the stirring end of the agitator 27 is located in the reaction slurry, and the aeration function end of the aeration device is located in front of the agitating end of the agitator 27 . That is, the agitator 27 is obliquely arranged on the side wall of the sump body 20, and the stirring end of the agitator 27 is not perpendicular to the side wall of the sump body 20, that is, the agitating end of the agitator 27 will not be horizontal and transverse as in the prior art Setting, in the prior art, the force at the stirring end is to stir the reaction slurry horizontally and transversely. In the present application, the agitator 27 is inclined at a certain angle or vertically arranged in the reaction slurry, and the aeration function end of the aeration device is arranged in front of the stirring end, so that after the reaction slurry is fully stirred, the nearest aeration function end is agitated. The rolled up reaction slurry is aerated so that the aeration is as sufficient as possible and the oxidation rate of the reaction slurry is as high as possible. The stirring end of the agitator installed obliquely on the side wall of the liquid collecting pool is parallel to or has an angle with the side wall of the liquid collecting pool. The side walls of the main body are parallel or have an included angle, so that when the stirring end stirs, the reaction slurry at different heights in the liquid collection tank body is stirred and fully stirred and aerated with the function of the aeration function end of the aeration device, and the liquid collection The reaction slurries of different heights and concentrations in the tank body are stirred evenly and mixed, which is convenient for the aeration device to fully aerate, and ensures that the reaction slurry in the subsequent cycle is a reaction slurry with a uniform concentration of desulfurization components, ensuring the desulfurization effect and desulfurization efficiency of the overall desulfurization device , to avoid polluting the environment. A further preferred technical solution is that the agitator 27 includes a rotary drive device 28, a stirring rotating shaft 29 and a stirring blade 30 installed at the end of the stirring rotating shaft 29, and the aeration function end is located in front of the stirring blade 30 , the driving device is connected to the stirring rotating shaft 29 . The rotary driving device 28 can be an aeration motor, which drives the agitating rotating shaft 29 connected thereto to rotate, and then drives the agitating blade 30 installed at the end of the agitating rotating shaft 29 to rotate together, and the agitating blade 30 stirs and turns over the reaction slurry near it , which is convenient for the aeration function end of the aeration device located in front of it to aerate the reaction slurry, and the aeration is more sufficient. A further preferred technical solution is that the aeration function end is located directly in front of one of the stirring blades 30 . In this way, when the stirring blade 30 is stirring, the reaction slurry is turned and stirred as much as possible to the aeration function end, and the oxidation reaction occurs in contact with the air bubbles ejected from the aeration hole 21 . The aeration effect is better, and the oxidation rate of the reaction slurry is higher.

A method of using it for flue gas desulfurization in the present invention, please refer to Fig. 2 to Fig. 18, on the basis of the technical solution described above, may specifically include the following steps:

A. The flue gas that needs to be desulfurized is transported to the flue gas flue 7 through the air induction device 51, and then pushed to the gas homogenizing device 4 by the subsequent flue gas. When approaching the gas homogenizing device 4, the ash storage device 50 sprays the dry powder desulfurization agent The device 8 transports the dry powder desulfurization agent, the dry powder desulfurization agent injection device 8 sprays the dry powder desulfurization agent into the flue gas flue 7, and the dry powder desulfurization agent is sprayed into the flue gas flue toward the gas homogenizing device 4, and the dry powder desulfurization agent and the flue gas mix and react. Pre-desulfurization;

B. The flue gas that has carried out the pre-desulfurization of step A enters the gas homogenizer 4, and is full of the gas homogenizer 4, then enters each swirl chamber 32 of the swirl reaction device 3, and passes through the swirl reactor in the swirl chamber 32 After 33, change its direction of movement to a tornado-like swirling movement;

C. The slurry circulation system 6 extracts the reaction slurry in the multifunctional liquid collection pool 5 and transports it to the upper part of the swirl reaction device 3, and enters the swirl chamber 32 from the upper part of each swirl chamber 32, and the reaction slurry and the high-speed swirl movement The flue gas meets, the two interact and form a suspended swirl layer above the cyclone reactor 33 under the action of the upward impact force of the flue gas, and the flue gas and the reaction slurry fully contact, mix and react in the suspended swirl layer , that is to carry out the swirl desulfurization reaction, when the reaction slurry keeps falling and the thickness of the suspension swirl layer is too large, part of the reaction slurry falls from the suspension swirl layer and passes through the swirl reactor 33, and then falls into the multifunctional set through the gas equalization device 4 The liquid pool 5 waits to be extracted again by the slurry circulation system and then undergoes desulfurization reaction with the flue gas;

The flue gas after the cyclone desulfurization reaction in the D.C step continues to rise and enters the demisting device 2 for demisting treatment, and the reaction slurry carried by the flue gas is removed;

The flue gas after the E.D step demisting treatment is discharged into the external atmosphere through the exhaust device 1;

F. When there are many sediments in the multifunctional liquid collection pool 5, use the gypsum preparation device 9 to extract the reaction slurry containing more sediments at the bottom of the multifunctional liquid collection pool 5, prepare desulfurized gypsum and output it, and simultaneously filter the reaction slurry. The desulfurization reaction will be carried out after rotating and conveying to the multifunctional liquid collection pool 5 for internal circulation.

A method of using it for flue gas desulfurization according to the present invention includes the above steps, so the air induction device 51 introduces the flue gas into the flue gas flue 7 and continuously sends the flue gas to the flue gas flue 7 to push the front The flue gas is sent to the gas equalizing device 4 to facilitate subsequent desulfurization reactions. When the flue gas that needs to be desulfurized is about to enter the gas homogenizing device 4, the dry powder desulfurizer is delivered to the dry powder desulfurizing agent injection device 8 in the ash storage device 50, from The dry powder desulfurization agent injection device 8 sprays dry powder desulfurizer such as quicklime into the flue gas flue 7, and the dry powder desulfurizer is mixed with the flue gas in the flue gas flue 7 to perform the first desulfurization, that is, pre-desulfurization, and the flue gas after pre-desulfurization The gas carries part of the dry powder desulfurizer into the gas equalization device 4 and then enters the cyclone reaction device 3, and then enters the demister device 2, and the desulfurized flue gas rising in the demist device 2 gradually clears the reaction slurry in the flue gas multiple times. For defogging, because the dry powder desulfurizer is desulfurized in advance, and then the slurry swirl desulfurization is performed, the desulfurization efficiency is higher, and after the dry powder pre-desulfurization, a part of the dry powder desulfurizer is carried into the gas equalization device 4 through the flue gas, and then falls into the multifunctional liquid collection Pool 5, reacts with water to form a desulfurization reaction slurry, that is, completes the pulping process. When there is too much sediment in the multifunctional liquid collection pool 5, and when the desulfurizing agent in the desulfurization reaction slurry is insufficient, the sediment can be removed from the multifunctional collection pool. The liquid pool 5 is transported to the gypsum preparation device 9 to prepare desulfurized gypsum, and the sprayed dry powder desulfurizer combines with the water in the reaction slurry to form a new reaction slurry with good activity of the desulfurizer, and the cleaning water or replenished water and the falling dry powder The desulfurization agent forms a desulfurization reaction slurry for pulping, so that the concentration of effective desulfurization components in the desulfurization reaction slurry increases. When the concentration of the desulfurizer is too high, the demisting device 2 can be cleaned, so that the cleaning water carries the reaction slurry into the swirling flow reaction device 3 and then falls to the multifunctional liquid collection pool 5. Water can also be added through the water supply device alone, and the cleaning water or supplemented The water neutralizes the desulfurization reaction slurry with a high concentration of desulfurization active components, so that the concentration of effective desulfurization components in the desulfurization reaction slurry decreases. After the flue gas running at a certain flow rate enters the swirler 33, it collides with the swirl vane 46. Since the flue gas is first changed by the swirl impeller 43 of the swirler 33, the flow direction is changed into a swirling flue gas like a tornado, and the flue gas and The desulfurization reaction slurry stays and fully contacts in the suspended swirling layer formed above the cyclone 33. Compared with the existing spray desulfurization device, the desulfurization reaction slurry is fully in contact with the flue gas, which greatly improves the reaction efficiency and the desulfurization effect. The desulfurization efficiency is at least 2-3 times that of the spray desulfurization device, and the desulfurization is more thorough. The sulfur content in the flue gas after desulfurization is very small, and it is basically harmless to the environment. Moreover, due to the pre-desulfurization of the dry powder desulfurizer, the dry powder desulfurizer enters the cyclone 33, enters the demisting device 2, etc., and combines with the water of the reaction slurry, or finally enters the multifunctional liquid collection pool 5 to form a new reaction slurry with water, so A pulping tank and a sedimentation tank are no longer needed, and a multifunctional liquid collection tank 5 can realize pulping, circulating slurry and sedimentation slurry. It saves space and saves cost at the same time. The slurry can be recycled to save energy and protect the environment, and the desulfurization effect is better. The gypsum preparation device 9 extracts the reaction slurry with a lot of sediments to prepare desulfurized gypsum, and at the same time, the reaction slurry from which the sediments are removed is spun and transported to the multifunctional liquid collection pool 5 for subsequent desulfurization reaction. Compared with the prior art, it has the advantages of simple structure, pre-desulfurization in the flue gas flue 7 before performing flue gas desulfurization, and then performing swirl desulfurization reaction to improve the effect of flue gas desulfurization and desulfurization High efficiency, saving space, eliminating the need for pulping tanks and sinking tanks, facilitating later maintenance, low maintenance costs, and effectively saving energy and avoiding environmental pollution.

The above only illustrates several specific embodiments of the present invention, but it cannot be regarded as the scope of protection of the present invention. Any equivalent change or modification or proportional amplification or reduction made according to the design spirit of the present invention shall be considered to fall within the protection scope of the present invention.

Claims (10)

1. A flue gas desulfurization system, characterized in that: comprise a flue gas desulfurization tower, an ash storage device, a gypsum preparation device and a draft device, and the ash storage device, a draft device and a gypsum preparation device are all connected with the flue gas desulfurization tower Connected, the flue gas desulfurization tower includes a tower body and a smoke exhaust device, a mist removal device, a swirl reaction device, a gas equalization device and a multifunctional liquid collection pool arranged from top to bottom along the tower body, and the multifunctional The liquid collection pool is communicated with the cyclone reaction device through a slurry circulation system for pumping the reaction slurry into the upper part of the cyclone reaction device, the top of the demisting device is connected with the smoke exhaust device, and the cyclone The top of the flow reaction device communicates with the bottom of the demisting device, the bottom of the cyclone reaction device communicates with the top of the gas homogenizer, the gas homogenizer communicates with the flue gas flue, and the flue gas flue is close to A dry powder inlet is provided at the gas equalizer, and the dry powder inlet is connected to a dry powder desulfurizer injection device for spraying dry powder to the dry powder inlet. The front end of the dry powder desulfurizer injection device faces into the gas homogenizer and is connected to the The inflow direction of the flue gas is consistent, the multi-functional liquid collection pool is directly below the gas equalizer, and the swirl reaction device includes a swirl shell and at least two swirl shells arranged horizontally in the swirl shell. chamber, at least one cyclone is arranged horizontally in the cyclone chamber, the upper part of the cyclone chamber is provided with a circulating reaction slurry inlet, the lower part of the cyclone chamber is connected with the gas homogenization device, and the cyclone includes a horizontally arranged cyclone A flow impeller, the swirl impeller includes an impeller casing arranged on the outer periphery, an impeller central shaft arranged in the center, and at least five spirally rising swirl blades, the swirl blades are arranged around the central shaft of the impeller, and the impeller The casing is fixed in the swirl chamber, the inner edge of the swirl blade is fixed to the central shaft of the impeller, the outer edge of the swirl blade is fixed to the impeller casing, and the air induction device is connected to the flue gas The flue is connected, the ash storage device is connected with the dry powder desulfurizer injection device, and the gypsum preparation device is connected with the bottom of the multifunctional liquid collection pool. 2. A flue gas desulfurization system according to claim 1, characterized in that: the dry powder desulfurization agent injection device includes a dry powder desulfurization agent injection pipe connected to an air gun and is arranged at the end of the dry powder desulfurization agent injection pipe The spray gun is fixed in communication with the dry powder desulfurizer injection pipe, the front part of the spray gun passes through the dry powder inlet, and the front part of the spray gun extends into the flue gas flue, the The ash storage device is an ash storage bin, and the ash storage bin communicates with the air-filling gun. 3. A flue gas desulfurization system according to claim 1, characterized in that: the gypsum preparation device comprises a gypsum discharge pump, a gypsum slurry cyclone and a vacuum belt filter, and the gypsum discharge pump is connected to the The bottom of the multifunctional liquid collection pool is connected, the gypsum slurry cyclone is connected with the gypsum discharge pump, the gypsum slurry cyclone is provided with a gypsum outlet and the reaction slurry outlet, and the gypsum slurry cyclone gypsum outlet is It is in communication with the vacuum belt filter, and the reaction slurry outlet of the gypsum slurry cyclone shown is in communication with the upper part of the multifunctional liquid collection pool. 4. A flue gas desulfurization system according to claim 1, 2 or 3, characterized in that: said draft device is a main draft fan. 5. A flue gas desulfurization system according to claim 1, 2 or 3, characterized in that there are at least two swirl chambers, and at least one of the swirl chambers is provided with a swirl chamber that can be opened and closed. A flue gas flow regulating device on the top of the flow chamber, the flue gas flow regulating device is connected to the top of the swirl chamber. 6. A flue gas desulfurization system according to claim 1, 2 or 3, characterized in that: the tops of the swirl blades are all arc-shaped, and the top surface of the swirl impeller forms an arc with a low center and a high outer circumference shape. 7. A flue gas desulfurization system according to claim 1, 2 or 3, characterized in that: the upper part of the cyclone chamber is provided with an expansion area that expands upwards and outwards, and the expansion area is set around the cyclone chamber In the upper part, the size of the outer edge of the top of the expansion area is larger than that of the outer edge of the bottom of the expansion area, and the expansion area transitions evenly from top to bottom. 8. A flue gas desulfurization system according to claim 1, 2 or 3, characterized in that: the demister device comprises a demister chamber, a demister and a demist cleaning device, and the demister is at least Two, the demister and the demist cleaning device are horizontally arranged in the demist chamber, each of the demisters corresponds to at least one of the demist cleaners, each of the demisters At least thirty-six defogging blades are arranged at equal intervals in the mistizer, and the longitudinal interface shape of the defogging blades is S-shaped. 9. A flue gas desulfurization system according to claim 1, 2 or 3, characterized in that: the multifunctional liquid collection pool includes a liquid collection pool body, and an aeration device is arranged in the liquid collection pool body, and the collection pool The bottom of the liquid pool body is connected to the gypsum preparation device, the inside of the liquid pool body is reset with reaction slurry, the liquid pool body is connected with the outside through the reaction slurry circulation system, and the liquid pool body is provided with an agitator, so The aeration device includes at least two aeration functional ends, the aeration functional end extends into the liquid collection tank body, and the aeration functional end passes through the side wall of the liquid collection tank body and inserts into the liquid collection tank body In the body, the aeration function end is inserted into the reaction slurry from top to bottom, the interior of the aeration function end is hollow and the aeration function end has an aeration hole at least at its bottom end, and the aeration hole in the reaction slurry. 10. The method for flue gas desulfurization using the flue gas desulfurization system described in claim 1, 2 or 3, characterized in that: comprising the following steps: A. The flue gas that needs to be desulfurized is transported to the flue gas flue through the air induction device, and then pushed to the gas equalization device by the follow-up flue gas. When approaching the gas homogenization device, the ash storage device delivers dry powder desulfurization agent to the dry powder desulfurization agent injection device , the dry powder desulfurizer injection device sprays the dry powder desulfurizer into the flue gas flue, and the dry powder desulfurizer is sprayed into the flue gas flue toward the gas homogenizing device, and the dry powder desulfurizer and the flue gas are mixed and reacted for pre-desulfurization; B. After the pre-desulfurization of step A, the flue gas enters the gas equalization device, fills the gas homogenizer, and then enters each swirl chamber of the swirl reaction device. After passing through the swirl reactor in the swirl chamber, change its direction of movement It is a tornado-like swirling motion; C. The slurry circulation system extracts the reaction slurry in the multifunctional liquid collection pool and transports it to the upper part of the swirl reaction device, and enters the swirl chamber from the upper part of each swirl chamber. The reaction slurry meets the high-speed swirling flue gas, and the two Interact and form a suspended swirl layer above the cyclone reactor under the action of the upward impact force of the flue gas. The flue gas and the reaction slurry fully contact, mix and react in the suspended swirl layer, that is, the swirl desulfurization reaction is carried out. When the reaction slurry keeps falling and the thickness of the suspension swirl layer is too large, part of the reaction slurry falls from the suspension swirl layer and passes through the swirl reactor, then falls into the multifunctional liquid collection pool through the gas equalization device and waits to be extracted by the slurry circulation system again. Desulfurization reaction with flue gas; The flue gas after the cyclone desulfurization reaction in the D.C step continues to rise and enters the demisting device for demisting treatment, and the reaction slurry carried by the flue gas is removed; The flue gas after the demisting treatment in the E.D step is discharged into the outside atmosphere through the exhaust device; F. When there are many sediments in the multi-functional liquid collection pool, use the gypsum preparation device to extract the reaction slurry containing more sediments at the bottom of the multi-functional liquid collection pool to prepare desulfurized gypsum and output it. At the same time, the filtered reaction slurry is rotated and transported to the multi-functional The desulfurization reaction is carried out after circulation in the liquid collection tank.