CN111977995A - Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system - Google Patents

Abstract

The invention discloses a powder lime calcining transformation system based on a new dry process cement clinker firing system, including a preheater decomposition furnace in the new dry process cement clinker firing system, and the preheater decomposition furnace is used as the first stage The suspension calcination system also includes a secondary suspension calcination system and a suspension cooling system. The secondary suspension calcination system is composed of a suspension calciner and a cyclone separator. The suspension cooling system includes a multi-stage series suspension cooler. The multi-stage series suspension cooler consists of The multi-stage suspension cooler cyclone cylinders are connected in series. The invention utilizes the existing partial equipment and facilities of the new dry process cement production line to transform the clinker sintering system into calcined powdered lime products, with advanced technology, green energy saving, high degree of automation and intelligent operation. At the same time, idle equipment can be effectively used, new product fields can be opened up, and enterprise benefits can be increased.

Description

Powder lime calcination reformation system based on new dry process cement clinker calcination system

technical field

The invention relates to the field of a new dry process cement clinker firing system, in particular to a powder lime calcining transformation system based on the new dry process cement clinker firing system.

Background technique

Active lime is an indispensable and important industrial raw material in various industrial sectors. It is widely used in calcium carbide, electric power, glass fiber, building materials, papermaking, sewage treatment and other industries, with an annual consumption of nearly 300 million tons. Among them, powdered lime is mainly used in power desulfurization, glass fiber, building materials, papermaking, sewage treatment and other industries, and the powdered lime market can be replaced by powdered lime. The total annual consumption of powdered lime is nearly 150 million tons.

At present, lime production is mainly obtained by calcining massive limestone. The production enterprises are small and scattered, and the technology is backward and the environment is poor. Commonly used limestone calcining devices mainly include mechanized shaft kiln, beam shaft kiln, sleeve shaft kiln, double-chamber shaft kiln, and vertical preheater rotary kiln. The heat consumption is high, the product quality and uniformity are difficult to guarantee, and there are phenomena such as over-burning on the outside and under-burning on the inside to varying degrees.

At present, powdered lime is obtained by selecting, crushing and grinding block lime, but the grindability of block lime is far worse than that of limestone, and the power consumption of grinding is high. With the increasing demand for powdered lime, it is more appropriate to use a green, energy-saving and environmentally friendly powdered lime calcination process.

The reaction of limestone calcination is that calcium carbonate decomposes CaCO3→CaO+CO2. This decomposition reaction is an endothermic reaction. When the temperature rises to 550℃, CaCO3 begins to endothermic decomposition into CaO and emits CO2 gas. With the increase of temperature, the decomposition The speed is accelerated, and a large amount of decomposition begins at above 750 ℃, and the heat absorption is 1660kj/kg (397kcal/kg). The decomposition reaction rate of calcium carbonate is mainly related to factors such as calciner temperature, CO2 partial pressure, and calcium carbonate particle size. The size of limestone particles is the most important factor affecting the reaction rate of calcium carbonate decomposition. The larger the limestone particles, the deeper the inside of the particles, the slower the penetration of heat and the CO2 overflow generated by decomposition, and the slower the decomposition reaction of calcium carbonate.

The most effective method to improve the decomposition reaction rate of calcium carbonate is to change the limestone from block to powder calcination, that is, to use the suspension preheating decomposition technology to complete the preheating and decomposition process of limestone powder in a suspended state. Relevant experiments show that under laboratory conditions, the complete decomposition time of limestone with a particle size of 0.1 mm at 950 ° C is less than 2 seconds.

Moreover, the suspension preheating decomposition technology has been widely and maturely applied in my country, especially in the cement industry. Chamber 6, rotary kiln 7, kiln head burner 9, grate cooler 8, waste heat recovery device 4, high temperature fan 3, among which preheater decomposition furnace 5 includes five-stage preheater cyclone 5-1, 5- 2, 5-3, 5-4, 5-5, as well as decomposition furnace 5-6, gooseneck 5-7, raw powder A with limestone powder as the main ingredient is passed through the four-stage preheater cyclone 5- 1, 5-2, 5-3, 5-4 are preheated step by step and then enter the decomposition furnace 5-6 to be calcined and decomposed, and then enter the fifth-stage preheater cyclone 5-5 through the gooseneck 5-7 Separation and collection are carried out, and then the fifth-stage preheater cyclone 5-5 enters the rotary kiln 7 through the kiln tail smoke chamber 6 for solid-phase reaction sintering clinker, and finally the cement clinker B is obtained after cooling by the grate cooler 8, Among them, the high-temperature exhaust gas discharged from the exhaust gas outlet end of the first-stage preheater cyclone 5-1 is recovered by the waste heat recovery device 4, and then sent to the At least one of the external waste gas dust removal system and the raw material grinding system. The core preheater decomposition furnace of the clinker sintering system of the new dry process cement production line is a preheating calcination system mainly based on the decomposition reaction of calcium carbonate. The calcium content is 43~45%, and the decomposition rate of the raw meal powder calcium carbonate in the kiln generally reaches 90~95%.

Due to the rapid development of the new dry process cement industry in China, the overcapacity situation in the cement market has gradually increased in recent years. of new dry-process cement production lines were shut down and idled. It is possible and necessary to modify the core preheater decomposition furnace of its sintering system to calcine powdered lime products, while limestone and fuel can be crushed and stored using existing equipment and facilities, and limestone powder can be prepared using existing raw meal System preparation, storage and metering feeding of the existing raw meal homogenization system, fuel powder can also be used for grinding and metering feeding of the existing fuel preparation system, opening up new product fields for enterprises and revitalizing existing assets.

In the transformation, the calcined raw material is changed from limestone with about 80~85% raw meal powder to single limestone powder and the limestone used has a higher calcium oxide content, that is, the calcium oxide content in the calcined raw material is increased from 43~45% to 52~55% % or higher, the main technical problems to be solved are, firstly, how to increase the decomposition rate of calcium carbonate to 97-99% to obtain purer powdered lime, and secondly, how to cool the high-temperature powdered lime product obtained by calcination, the present invention Aims to provide a technical solution for this.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a powdered lime calcination transformation system based on the new dry process cement clinker calcination system, to use the existing preheater decomposition furnace as a first-level suspension calcination system to preheat and decompose the fed limestone Add the secondary suspension calcining system to further decompose the primary powder lime product obtained by the primary suspension calcining system; add the suspension cooling system to cool the finished powder lime product of the secondary suspension calcining furnace.

In order to achieve the above object, the technical scheme adopted in the present invention is:

The powder lime calcination transformation system based on the new dry process cement clinker firing system includes the preheater decomposition furnace in the new dry process cement clinker firing system. The preheater decomposition furnace includes a multi-stage preheater cyclone, a decomposition furnace The furnace is characterized in that: the preheater decomposition furnace is used as a primary suspension calcination system, and also includes a secondary suspension calcination system and a suspension cooling system, wherein:

In the one-stage suspension calcination system, the raw limestone powder is preheated in turn by the cyclones of the preheaters at all levels except the last stage, and then enters the decomposition furnace, and is calcined in the decomposition furnace to obtain the preliminary product of powdered lime, which is the preliminary product of powdered lime. Then enter the last stage of preheater cyclone for separation and collection,

The secondary suspension calcination system includes a suspension calcination furnace and a cyclone separator. The discharge end of the cyclone of the last stage preheater in the primary suspension calcination system is connected to the feed end of the suspension calciner, and the discharge end of the suspension calciner is connected to the feed end of the suspension calciner. It is connected with the feed end of the cyclone separator, and the preheater cyclone of the last stage in the first-stage suspension calcination system sends the collected preliminary powder lime product to the suspension calciner for further calcination to obtain the finished powder lime. It is then sent to the cyclone separator by the suspension calciner for separation and collection;

The suspension cooling system includes a multi-stage series suspension cooler. The multi-stage series suspension cooler is composed of multi-stage suspension cooler cyclones connected in series. The feed end of the first-stage suspension cooler cyclone is separated from the cyclone in the secondary suspension calcination system. The discharge end of the cyclone of the adjacent suspension cooler is connected to the discharge end of the cyclone of the adjacent suspension cooler of the previous stage and the feed end of the cyclone of the suspension cooler of the next stage is connected. The finished powder lime in the cyclone separator passes through the multistage suspension cooler. The cyclone is successively cooled by heat exchange, and finally the finished powder lime is collected by the cyclone of the last stage of suspension cooler, and the finished powder lime is discharged from the discharge end of the cyclone of the last stage of suspension cooler.

The described powder lime calcination transformation system based on the new dry process cement clinker calcination system is characterized in that: in the first-stage suspension calcination system, the original kiln tail smoke chamber of the precalciner is replaced with an air inlet chamber; the The exhaust gas outlet end of the cyclone separator in the secondary suspension calcination system is connected with the air inlet of the air inlet chamber of the decomposition furnace, and the exhaust gas discharged from the cyclone separator enters the air inlet chamber of the decomposition furnace to serve as the combustion air and suspension medium of the decomposition furnace. smoke.

The described powder lime calcining transformation system based on the new dry process cement clinker calcining system is characterized in that: it also includes a waste heat recovery device and a high temperature fan in the new dry process cement clinker calcining system, and a first-stage suspension calcining system. The exhaust gas outlet end of the first-stage preheater cyclone is connected to the inlet end of the waste heat recovery device, the outlet end of the waste heat recovery device is connected to the inlet end of the high temperature fan, and the outlet end of the high temperature fan is connected to the exhaust gas pipeline of the dust removal system and the waste gas of the raw material grinding system At least one of the two pipes is connected, and the high-temperature exhaust gas discharged from the cyclone of the first-stage preheater is recovered by the waste heat recovery device, and then sent to at least one of the external exhaust gas dust removal system and the raw material grinding system through the high-temperature fan. By.

The described powder lime calcination transformation system based on the new dry process cement clinker calcination system is characterized in that: the suspension calciner in the two-stage suspension calcination system has an auxiliary combustion ignition chamber, and the auxiliary combustion ignition chamber is a suspension calcination chamber. The furnace introduces combustion air and combustion fuel to ignite and increase the combustion air temperature of the suspension calciner;

The suspension cooling system further includes a cooler exhaust fan, the hot air outlet end of the first-stage suspension cooler cyclone in the suspension cooling system is connected to the inlet end of the cooler exhaust fan, and the outlet end of the cooler exhaust fan is ignited with the auxiliary combustion. The inlet end of the chamber is connected, and most of the hot air discharged from the cyclone of the first-stage suspension cooler is sent to the auxiliary combustion ignition chamber through the cooler exhaust fan to assist the combustion of the suspension calciner.

The described powder lime calcination transformation system based on the new dry process cement clinker sintering system is characterized in that: the outlet end of the exhaust fan of the cooler is also connected with the exhaust gas pipeline of the dust removal system through the air release valve, and the first-stage suspension cooler cyclone The rest of the hot air discharged from the cylinder is sent to the exhaust gas pipe of the dust removal system through the cooler exhaust fan and air release valve.

The described powder lime calcining transformation system based on the new dry process cement clinker sintering system is characterized in that: the fuel used in the decomposing furnace and the suspension calcining furnace is one or more of coal, natural gas, fuel oil and petroleum coke. mixture in any proportion.

The described powder lime calcining transformation system based on the new dry process cement clinker sintering system is characterized in that: the outlet temperature of the decomposition furnace of the first-stage suspension calcining system is controlled at 850-930°C.

The described powder lime calcination reformation system based on the new dry process cement clinker sintering system is characterized in that: the outlet temperature of the suspension calciner of the secondary suspension calcination system is controlled at 900-980°C.

The advantages of the present invention are:

The transformed powder lime secondary suspension calcination cooling system organically integrates the limestone powder preheating, decomposition, secondary re-decomposition, and powder lime cooling process, and the whole process is completed in a suspended state. Therefore, the thermal efficiency is high, the system energy consumption is low; the reaction speed is fast, the temperature distribution is uniform and controllable, the product quality is stable, and the active calcium oxide content of the finished powder lime can be effectively controlled;

The new dry-process cement production line has complete environmental protection facilities and a high degree of mechanization and automation, which is conducive to the realization of green, energy-saving and intelligent operation of the transformed powder lime secondary suspension calcination cooling system.

The new dry process cement production line has accumulated rich experience in the operation, management and operation of the existing suspension preheating decomposition system, which can be used for reference.

Effectively utilize the idle equipment and facilities of the new dry-process cement production line to open up new product fields and increase enterprise benefits.

Description of drawings

FIG. 1 is a structural diagram of a new dry process cement clinker firing system in the prior art.

Fig. 2 is a system structure diagram of the present invention.

In the figure: 1 is the exhaust gas pipeline to the dust removal system, 2 is the exhaust gas pipeline to the raw material grinding system, 3 is the high temperature fan, 4 is the waste heat recovery device, 5 is the preheater decomposition furnace, 5-1 is the C1 cyclone, 5- 2 is C2 cyclone, 5-3 is C3 cyclone, 5-4 is C4 cyclone, 5-5 is C5 cyclone, 5-6 is calciner, 5-7 is gooseneck, 6 is kiln tail smoke Chamber, 7 is the rotary kiln, 8 is the grate cooler, 9 is the kiln head burner, 10 is the secondary series suspension cooler, 10-1 is the CL1 cyclone, 10-2 is the CL2 cyclone, and 11 is the cooler row. Fan, 12 is a vent valve, 13 is an air inlet chamber, 14 is an auxiliary combustion ignition chamber, 15 is a suspension calciner, and 16 is a cyclone separator. A is raw meal powder, B is cement clinker, C is limestone powder, D is preliminary powder lime product, and E is powder lime finished product.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Fig. 2, the powder lime calcination transformation system based on the new dry process cement clinker firing system includes the preheater decomposition furnace 5 in the new dry process cement clinker firing system, and the preheater decomposition furnace 5 includes five Stage preheater cyclone 5-1, 5-2, 5-3, 5-4, 5-5, and calciner 5-6, with the preheater calcination furnace as the first stage suspension calcination system, also including the second stage Suspension calcination system, suspension cooling system, including:

In the one-stage suspension calcination system, the raw limestone powder C is preheated in sequence by the preheater cyclones 5-1, 5-2, 5-3, and 5-4 of all stages except the last stage, and then enters the decomposition furnace 5. In -6, calcining in the decomposition furnace 5-6 obtains the preliminary powder lime product D, and the preliminary powder lime product D enters the final stage preheater cyclone 5-5 through the gooseneck pipe 5-7 for separation and collection;

The secondary suspension calcining system includes a suspension calcining furnace 15 and a cyclone separator 16. The discharge end of the last stage preheater cyclone 5-5 in the primary suspension calcining system is connected to the feeding end of the suspension calcining furnace 15. The discharge end of the calciner 15 is connected to the feed end of the cyclone separator 16, and the collected powder lime preliminary product D is sent to the suspension calcination system by the last stage preheater cyclone 5-5 in the first stage suspension calcination system. Further calcining in the furnace 15 obtains the finished powdered lime E, and the finished powdered lime E is then sent to the cyclone 16 by the suspension calcining furnace 15 for separation and collection;

The suspension cooling system includes a two-stage series-connected suspension cooler 10. The two-stage series-connected suspension cooler 10 is composed of two-stage suspension cooler cyclones 10-1 and 10-2 connected in series. The feed end is connected to the discharge end of the cyclone separator 16 in the secondary suspension calcination system, and the discharge end of the first-stage suspension cooler cyclone 10-1 is connected to the feed of the second-stage suspension cooler cyclone 10-2 At the same time, air is introduced into the feed end of the second-stage suspension cooler cyclone 10-2, and the finished powdered lime E in the cyclone separator 16 is sequentially heat-exchanged through the two-stage suspension cooler cyclone 10-1 and 10-2. After cooling, the finished powdered lime E is finally collected by the second-stage suspension cooler cyclone 10-2, and the finished powdered lime E is discharged from the discharge end of the second-stage suspension cooler cyclone 10-2.

In the first-stage suspension calcination system of the present invention, the original kiln tail smoke chamber of the decomposition furnace 5-6 is replaced by the air inlet chamber 13; The air inlets of the air inlet chamber 13 are connected, and the exhaust gas discharged from the cyclone separator 16 enters the air inlet chamber 13 of the decomposition furnace 5-6 to be used as combustion air and suspended medium flue gas of the decomposition furnace 5-6.

The present invention also includes the waste heat recovery device 4 and the high temperature fan 3 in the new dry process cement clinker sintering system, the exhaust gas outlet end of the first-stage preheater cyclone 5-1 in the first-stage suspension calcination system and the waste heat recovery device 4 The inlet end of the waste heat recovery device 4 is connected to the inlet end of the high temperature fan 3, and the outlet end of the high temperature fan 3 is connected to at least one of the exhaust gas pipeline 1 of the dust removal system and the exhaust gas pipeline 2 of the raw material grinding system. The high-temperature exhaust gas discharged from the cyclone 5-1 of the stage preheater is partially recovered by the waste heat recovery device 4, and then sent to at least one of the external exhaust gas dust removal system and the raw material grinding system through the high-temperature fan 3.

In the present invention, the suspension calciner 15 in the secondary suspension calcination system has an auxiliary combustion ignition chamber 14, and the auxiliary combustion ignition chamber 14 introduces combustion air and combustion fuel into the suspension calciner 15 to ignite and improve the combustion air of the suspension calciner. temperature;

The suspension cooling system also includes a cooler exhaust fan 11. The hot air outlet end of the first-stage suspension cooler cyclone 10-1 in the suspension cooling system is connected to the inlet end of the cooler exhaust fan 11, and the outlet end of the cooler exhaust fan 11 is connected. It is connected to the inlet end of the auxiliary combustion ignition chamber 14, and most of the hot air discharged from the first-stage suspension cooler cyclone 10-1 is sent to the auxiliary combustion ignition chamber 14 through the cooler exhaust fan 11 for combustion in the suspension calciner. Combustion.

In the present invention, the outlet end of the cooler exhaust fan 11 is also connected to the exhaust gas pipe 1 of the dust removal system through the air release valve 12, and the rest of the hot air discharged from the first-stage suspension cooler 10-1 passes through the cooler exhaust fan 11, and the air is released. The valve 12 is sent to the exhaust gas pipeline 1 of the dust removal system.

In the present invention, the fuel used in the decomposition furnace and the suspension calciner is a mixture of one or more of coal, natural gas, fuel oil, and petroleum coke in any proportion.

In the present invention, the outlet temperature of the decomposition furnace of the primary suspension calcination system is controlled at 850-930°C. The outlet temperature of the suspension calciner of the secondary suspension calcination system is controlled at 900~980℃.

The invention transforms the clinker sintering system of the new dry-process cement production line into a secondary suspension calcining cooling system for powdered lime, which is used to produce the powdered lime. Its characteristics are as follows:

(1) Utilize the existing preheater decomposition furnace 5 as a one-stage suspension calcination system

As the raw material, limestone powder C is first fed into the inlet pipe of the first-stage preheater cyclone 5-1, and is preheated step by step through the preheater cyclone 5-1, 5-2, 5-3, and 5-4. The stage preheater cyclone 5-4 enters into the decomposition furnace 5-6 after being collected, and the raw limestone powder C is calcined by using fuel in the decomposition furnace 5-6 under the combustion air environment, and the powdered lime obtained after calcination is preliminary. Product D is separated and collected by the fifth stage preheater cyclone 5-5.

In the present invention, the kiln tail smoke chamber under the existing calcining furnaces 5-6 is changed to an air inlet chamber 13, and combustion air and suspended medium flue gas are introduced into the calcining furnaces 5-6.

The high-temperature exhaust gas at the outlet of the first-stage preheater cyclone 5-1 is partially recovered by the waste heat recovery device 4, and then sent to the external exhaust gas dust removal system or the raw material grinding system through the high-temperature fan 3.

(2) Add a secondary suspension calcination system

The secondary suspension calcination system includes a suspension calcination furnace 15, a cyclone separator 16, an auxiliary combustion ignition chamber 14, etc., and further decomposes the primary product D of powdered lime obtained by the primary suspension calcination system.

The preliminary powder lime product D collected by the fifth-stage preheater cyclone 5-5 enters the newly added suspension calciner 15 through the discharge pipe, and the preliminary powder lime product D is prepared by using fuel in the suspension calciner 8 under the combustion air environment. D is further calcined, and the suspension calcining furnace 15 is initially a pure air environment, wherein the partial pressure of carbon dioxide is lower than that of flue gas and the partial pressure of oxygen is higher than that of flue gas, which is beneficial to fuel combustion and undecomposed calcium carbonate in the preliminary product D of powdered lime Break it down further. The finished powdered lime E obtained after calcination is separated and collected by the cyclone separator 16, and the exhaust gas at the outlet of the cyclone separator 16 is sent to the air inlet chamber 13 below the decomposition furnace 5-6 by the pipeline, as the combustion air of the decomposition furnace 5-6 and the air inlet chamber 13. Suspended medium flue gas.

The lower end of the suspension calciner 15 is connected with an auxiliary combustion ignition chamber 14 through a constriction. The auxiliary combustion ignition chamber 14 introduces combustion air, ignition and combustion fuel for the suspension calciner 15 to increase the temperature of the combustion air.

(3) Increase the suspension cooling system

The suspension cooling system includes a secondary series suspension cooler 10, a cooler exhaust fan 11, etc., to cool the finished powder lime E of the secondary suspension calciner.

The finished powdered lime E from the suspension calciner 15 is separated and collected by the cyclone separator 16, and then fed into the inlet pipe of the first-stage suspension cooler cyclone 10-1, and passes through heat exchange and the first-stage suspension cooler cyclone 10- 1 separation; then feed into the inlet pipe of the second-stage suspension cooler cyclone 10-2, cold air enters the feed end of the second-stage suspension cooler cyclone 10-2, and is cooled by the second-stage suspension after heat exchange The cyclone 10-2 is then separated and collected.

The two-stage series-connected suspension cooler 10 cools the finished powdered lime E to obtain the hot air from the outlet of the first-stage suspension cooler cyclone 10-1, and most of it is sent to the suspension calciner 15 through the cooler exhaust fan 11 for fuel combustion and combustion, and a small part The excess hot air is sent to the pipeline 1 of the exhaust gas dust removal system through the air release valve 12 .

In this embodiment, the outlet temperature of the decomposition furnace 5-6 of the primary suspension calcination system is controlled at 850-930°C, and the outlet temperature of the suspension calciner 15 of the secondary suspension calcination system is controlled at 900-980°C.

In this embodiment, the fuels used in the decomposition furnaces 5-6 and the suspension calciner 15 are co-firing of one or more of coal, natural gas, fuel oil, and petroleum coke.

In this embodiment, the number of stages of the preheater of the existing preheater decomposition furnace 5 is five, but it is not limited to this. It can also be grade six or grade four.

In this embodiment, various optimization modifications can also be performed on the constituent units of the existing preheater decomposition furnace 5 for the purpose of reducing resistance and increasing efficiency, including adding or reducing a first-stage preheater.

In this embodiment, the number of stages in series of the two-stage series-connected suspension coolers 10 is two-stage, but it is not limited to this. It can also be level three.

In this embodiment, the hot air of the secondary suspension cooler 10 can also be led to the fuel pulverizing system as a fuel drying heat source.

The embodiments of the present invention are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Various modifications and improvements made should fall within the protection scope of the present invention, and the technical content claimed in the present invention has been fully recorded in the claims.

Claims (8)

1. Powder lime calcination transformation system based on novel dry process cement clinker system of firing burns, including the preheater dore furnace in the novel dry process cement clinker system of firing, the preheater dore furnace includes multistage preheater whirlwind section of thick bamboo, dore furnace, its characterized in that: regard as one-level suspension system of calcining with preheater dore furnace, still include second grade suspension system of calcining, suspension cooling system, wherein:

in the first-stage suspension calcining system, limestone powder as a raw material is sequentially preheated by the cyclone cylinders of all stages of preheaters except the last stage and then enters a decomposing furnace, the limestone powder is calcined in the decomposing furnace to obtain a primary product of powdered lime, the primary product of powdered lime enters the cyclone cylinders of the last stage of preheaters for separation and collection,

the secondary suspension calcining system comprises a suspension calcining furnace and a cyclone separator, wherein the discharge end of a cyclone cylinder of a last stage preheater in the primary suspension calcining system is connected with the feed end of the suspension calcining furnace, the discharge end of the suspension calcining furnace is connected with the feed end of the cyclone separator, the collected primary powdered lime product is sent into the suspension calcining furnace by the cyclone cylinder of the last stage preheater in the primary suspension calcining system for further calcining to obtain finished powdered lime, and the finished powdered lime is sent into the cyclone separator for separation and collection by the suspension calcining furnace;

the suspension cooling system comprises multistage series suspension coolers, the multistage series suspension coolers are formed by connecting multistage suspension cooler cyclone cylinders in series, wherein the feed end of a first stage suspension cooler cyclone cylinder is connected with the discharge end of a cyclone separator in the second stage suspension calcining system, the discharge end of an adjacent previous stage suspension cooler cyclone cylinder is connected with the feed end of a next stage suspension cooler cyclone cylinder, the finished product powder lime in the cyclone separator is subjected to heat exchange cooling in sequence through the multistage suspension cooler cyclone cylinders, the finished product powder lime is finally collected by the last stage suspension cooler cyclone cylinder, and the finished product powder lime is discharged from the discharge end of the last stage suspension cooler cyclone cylinder.

2. The system of claim 1, wherein the system comprises: in the primary suspension calcining system, an original kiln tail smoke chamber of the decomposing furnace is replaced by an air inlet chamber; and the waste gas outlet end of the cyclone separator in the secondary suspension calcining system is communicated with the air inlet of the air inlet chamber of the decomposing furnace, and the waste gas discharged by the cyclone separator enters the air inlet chamber of the decomposing furnace to be used as combustion air and suspension medium flue gas of the decomposing furnace.

3. The system of claim 1, wherein the system comprises: still include the waste heat recovery device among the novel dry process cement clinker system of firing into, the high temperature fan, the waste gas outlet end and the inlet connection of waste heat recovery device of first order preheater whirlwind section of thick bamboo in the system are calcined in the one-level suspension, the outlet end of waste heat recovery device and the inlet connection of high temperature fan, the outlet end and the dust pelletizing system exhaust gas pipeline of high temperature fan, at least one of the two of raw materials grinding system exhaust gas pipeline is connected, after the high temperature waste gas of first order preheater whirlwind section of thick bamboo discharge was retrieved partial heat by waste heat recovery device, send outside waste gas dust pelletizing system to through the high temperature fan again, at least one of the two.

4. The system of claim 1, wherein the system comprises: the suspension calciner in the secondary suspension calcining system is provided with an auxiliary combustion ignition chamber, and combustion air and combustion fuel are introduced into the suspension calciner from the auxiliary combustion ignition chamber so as to ignite and improve the combustion air temperature of the suspension calciner;

the suspension cooling system also comprises a cooler exhaust fan, the hot air outlet end of the first stage suspension cooler cyclone cylinder in the suspension cooling system is connected with the inlet end of the cooler exhaust fan, the outlet end of the cooler exhaust fan is connected with the inlet end of the auxiliary combustion ignition chamber, and most of hot air exhausted by the first stage suspension cooler cyclone cylinder is sent into the auxiliary combustion ignition chamber through the cooler exhaust fan to support combustion of the suspension calciner.

5. The pulverized lime calcination modification system based on the novel dry cement clinker firing system as claimed in claim 3 or 4, wherein: the outlet end of the exhaust fan of the cooler is also connected with a waste gas pipeline of the dust removal system through an air release valve, and the rest of hot air exhausted by the cyclone cylinder of the first-stage suspension cooler is sent to the waste gas pipeline of the dust removal system through the exhaust fan of the cooler and the air release valve.

6. The system of claim 1, wherein the system comprises: the fuel used by the decomposing furnace and the suspension calcining furnace is one or a mixture of more of coal, natural gas, fuel oil and petroleum coke in any proportion.

7. The system of claim 1, wherein the system comprises: and the outlet temperature of the decomposing furnace of the primary suspension calcining system is controlled to be 850-930 ℃.

8. The system of claim 1, wherein the system comprises: and the temperature of the outlet of the suspension calciner of the secondary suspension calcining system is controlled to be 900-980 ℃.

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