CN211411566U - Dry desulfurization device - Google Patents
Dry desulfurization device Download PDFInfo
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- CN211411566U CN211411566U CN201922264856.0U CN201922264856U CN211411566U CN 211411566 U CN211411566 U CN 211411566U CN 201922264856 U CN201922264856 U CN 201922264856U CN 211411566 U CN211411566 U CN 211411566U
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- desulfurizer
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 120
- 230000023556 desulfurization Effects 0.000 title claims abstract description 120
- 239000003546 flue gas Substances 0.000 claims abstract description 184
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 177
- 239000007921 spray Substances 0.000 claims abstract description 38
- 239000002918 waste heat Substances 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 41
- 238000011144 upstream manufacturing Methods 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 27
- 230000008569 process Effects 0.000 abstract description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 21
- 229910052717 sulfur Inorganic materials 0.000 description 19
- 239000011593 sulfur Substances 0.000 description 19
- 230000003009 desulfurizing effect Effects 0.000 description 8
- 239000002699 waste material Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
A dry desulfurization unit having a unit inlet connected to a unit outlet or control valve A2 via control valve A1; the control valve A2 is connected with the desulphurization component through the combined type waste heat boiler A or the first hot blast stove, and the steam pipeline of the combined type waste heat boiler A is connected with the steam heating pipeline; the desulfurization component comprises a plurality of desulfurization mixers, and each desulfurization mixer is at least internally provided with a desulfurizer spray gun; the flue gas outlet of the first desulfurization mixer T1 is connected with the outlet of the device or the flue gas inlet of the second desulfurization mixer T2 through a control valve A3, the flue gas outlet of the second desulfurization mixer T2 is connected with the outlet of the device or the flue gas inlet of the third desulfurization mixer T3 through a control valve A4, …, and the flue gas outlet of the tail end desulfurization mixer Tn is connected with the outlet of the device through a control valve An + 2; the device not only ensures higher process indexes, but also effectively controls the operation cost through more refined real-time accurate control of the dry desulphurization process link.
Description
Technical Field
The utility model relates to a flue gas denitration treatment field especially relates to a flue gas dry desulfurization device.
Background
The importance of preventing environmental pollution has been pointed out as a worldwide problem. With the development of modern industrial production and the improvement of living standard, air pollution becomes a very concern for people.
Sulfur dioxide and nitrogen oxides are two important aspects of atmospheric pollution control, NOXUnder the action of sunlight, photochemical reaction is caused to form photochemical smog, so that serious atmospheric pollution is caused.
The flue gas denitration technology mainly comprises a dry method (selective catalytic reduction SCR flue gas denitration, selective non-catalytic reduction SNCR denitration) and a wet method. Compared with the wet flue gas denitration technology, the dry flue gas denitration technology has the main advantages that: low investment, simple equipment and technological process, and NO removalXThe efficiency is higher, no wastewater or waste treatment is caused, and secondary pollution is not easy to cause; among the two dry flue gas denitration technologies, the SCR flue gas denitration technology has a higher denitration efficiency and is a hotspot of industrial research.
Before SCR catalytic flue gas denitration, the flue gas needs to be desulfurized, common desulfurization processes comprise three types of wet desulfurization, semi-dry desulfurization and dry desulfurization, the water vapor of the wet desulfurization is too large, the service performance of a catalyst and the operation of equipment are influenced, the semi-dry desulfurization is smaller in water vapor but larger in occupied space, the wet desulfurization and the semi-dry desulfurization are provided with special desulfurization tower devices for spraying desulfurizer and water and completing mixing with the flue gas, the dry desulfurization can not increase the flue gas humidity completely, usually, dry powder-shaped desulfurizer is sprayed in a flue directly to be mixed with the flue gas, and no special desulfurization device is provided.
In addition, the flue gas temperature difference of different trades is great, and flue gas temperature is too high, can waste surplus heat to be unfavorable for the long-term use of equipment, flue gas temperature is too low, can influence the effect of dry process desulfurization again, and stick with paste the bag when probably causing follow-up dust removal, corrode equipment etc..
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a dry desulphurization device is provided, the mixing time who makes flue gas and dry desulfurizer is sufficient, mixes fully, compact structure, and it is less to take up an area of, can the accurate flue gas temperature of adjusting, in time retrieve the surplus heat of flue gas, is applicable to the flue gas of multiple trade and handles.
The utility model discloses a realize through following technical scheme:
a dry desulfurization device is characterized in that: the device inlet is connected to the device outlet or control valve a2 via control valve a 1;
the control valve A2 is connected with the desulphurization component through the combined type waste heat boiler A or the first hot blast stove, and the steam pipeline of the combined type waste heat boiler A is connected with the steam heating pipeline;
the desulfurization component comprises a plurality of desulfurization mixers, and each desulfurization mixer is at least internally provided with a desulfurizer spray gun; the flue gas outlet of the first desulfurization mixer T1 is connected with the outlet of the device or the flue gas inlet of the second desulfurization mixer T2 through a control valve A3, the flue gas outlet of the second desulfurization mixer T2 is connected with the outlet of the device or the flue gas inlet of the third desulfurization mixer T3 through a control valve A4, …, and the flue gas outlet of the tail end desulfurization mixer Tn is connected with the outlet of the device through a control valve An + 2;
upstream of the control valve A1, SO is provided2A concentration sensor, a temperature sensor T, a flow meter F and a humidity sensor H are arranged at the upstream of a control valve A2, and SO is arranged at the upstream of control valves A3, A4, … and An +12A concentration sensor and a flowmeter F, if a plurality of desulfurizer spray guns are arranged in a single desulfurization mixer, and SO is arranged between two adjacent desulfurizer spray guns2A concentration sensor and a flow meter F.
The device mainly comprises two functional modules: a temperature adjusting module, a dry desulphurization module and a short circuit channel. The control unit is connected with each sensor through a signal line, and is connected with each control valve, the combined type waste heat boiler A, the first hot blast stove, the desulfurization mixer and the like through a control line, so that the flow direction of the flue gas is controlled according to specific parameters of the flue gas.
SO when controlling valve A1 upstream2When the concentration sensor monitors that the sulfur content of the flue gas entering the device is lower than the sulfur content control value of the flue gas, the flue gas directly enters the next working procedure through a short-circuit channel formed by a control valve A1 at the inlet of the device and a control valve A0 at the outlet of the device, and the flue gas does not need to flow in the device;
SO when controlling valve A1 upstream2When the concentration sensor monitors that the sulfur content of the flue gas entering the device is not lower than the sulfur content control value of the flue gas, the flue gas sequentially passes through the temperature adjusting module and the dry desulfurization module:
in the temperature adjusting module, when the flue gas temperature is higher than the upper limit of the temperature control value of the desulfurized flue gas, the combined type waste heat boiler A is started, the flue gas passes through the combined type waste heat boiler A, and the combined type waste heat boiler A recovers the heat of the flue gas to cool the combined type waste heat boiler A to the range of the temperature control value of the desulfurized flue gas; when the flue gas temperature is lower than the lower limit of the desulfurization flue gas temperature control value, the first hot blast stove is started, the flue gas passes through the first hot blast stove, and the first hot blast stove heats the flue gas to enable the temperature of the flue gas to rise to be within the range of the desulfurization flue gas temperature control value; when the flue gas temperature is within the range of the control value of the desulfurization flue gas temperature, the first hot blast stove does not start the heating function, and the flue gas directly passes through the first hot blast stove. The control unit controls the flow direction of the flue gas through the temperature of the current flue gas returned by the sensor, and controls the output of the combined type waste heat boiler A and the first hot blast stove through the temperature, the flow and the desulfurization flue gas temperature control value of the current flue gas returned by the sensor, so that the temperature of the flue gas flowing through the temperature adjusting module is adjusted within the range of the desulfurization flue gas temperature control value.
The control unit calculates the acid dew point through the humidity and the sulfur content of the current flue gas returned by the sensor, so that a temperature control value of the desulfurized flue gas is obtained, the temperature control value of the desulfurized flue gas is close to the acid dew point of the current flue gas and is higher than the calculated value of the acid dew point of the current flue gas, the optimal effect of SDS dry desulfurization is ensured, and bag pasting, equipment corrosion and the like of a bag-type dust remover in the subsequent dust removal process are avoided. In general, the range of the temperature control value of the desulfurized flue gas is more than or equal to 140 ℃ and less than or equal to 220 ℃.
In the dry desulfurization module, the desulfurizer injection amount is calculated according to the sulfur content and the flow of the flue gas, and after the desulfurizer is injected according to the amount and the desulfurizer and the flue gas are kept in mixed contact with a set stroke, the control unit flexibly selects by comparing the current sulfur content of the flue gas with the control value of the sulfur content of the flue gas: a. finishing the desulfurization process, and enabling the flue gas to enter the next process link; b. the flue gas continuously flows in the dry desulphurization device, so that a certain solid-gas mixing time is continuously kept; c. the flue gas continuously flows in the dry desulphurization device, so that the solid-gas mixing time is continuously kept for a certain time, and simultaneously, the desulfurizer is additionally sprayed. And the additional injection amount of the desulfurizer is accurately adjusted according to the theoretical molar ratio of the desulfurizer to the sulfur content of the current flue gas, so that a good desulfurization effect is ensured, the meaningless retention and waste of the desulfurizer in the desulfurization link after the sulfur content of the flue gas reaches a control index are avoided, and the high-efficiency and low-investment desulfurization is really realized. In addition, the number and the size of the desulfurization mixers can be flexibly selected and matched according to the condition of specific flue gas and the size of a field, so that the applicability is stronger, and the operation cost is more favorably reduced.
The equipment configuration and connection mode of the dry desulfurization device not only facilitates the control unit to flexibly select a reasonable flue gas operation path according to specific flue gas parameters, avoids flue gas circulation in modules which are not required to be used, increases unnecessary equipment operation cost, but also can flexibly select to only configure a plurality of process modules when treating single types of flue gas, and further reduces operation investment.
Further, the flue gas inlet and the exhanst gas outlet of desulfurization mixer all locate the top or be close to the top, and the reducing runner of desulfurization mixer inner chamber for being "U" shape:
the U-shaped vertical section on one side of the reducing flow passage sequentially comprises a first airflow nozzle, a first rectifying area and a first mixing area, wherein the first airflow nozzle is close to a flue gas inlet and is formed by gradually narrowing the diameter of the flow passage, the first rectifying area is equal in diameter, and the first mixing area is formed by gradually widening the diameter of the flow passage; a first desulfurizer spray gun is also arranged in the first rectifying area;
the U-shaped vertical section on the other side of the reducing flow channel sequentially comprises a second mixing area which is close to the first mixing area and gradually widens the diameter of the flow channel, the diameter of the tail end of the first mixing area is less than or equal to the diameter of the head end of the second mixing area, and a second rectifying area with the same diameter; a second desulfurizer spray gun is also arranged at the joint of the second mixing area and the second rectifying area; the second rectifying area is close to the smoke outlet;
the first mixing area is communicated with the second mixing area through a U-shaped bottom section of the reducing runner.
The diameters of a plurality of sections of the variable diameter runner in the desulfurization mixer are different, and the diameters are changed rapidly and slowly, an airflow injection area, a plurality of airflow rectifying areas and a plurality of airflow mixing areas are formed in the variable diameter runner, and the speed and the airflow form of flue gas are changed for a plurality of times when the flue gas passes through the variable diameter runner, so that the flue gas stays in the variable diameter runner, is fully mixed with the injected desulfurizer powder, then carries the desulfurizer powder to continue to advance, and is gradually desulfurized in the advancing process; the desulfurizer is sprayed once or many times, whether the desulfurizer is continuously sprayed or not can be flexibly selected according to the parameter change of the flue gas in the desulfurization process, a small amount of desulfurizer is sprayed, the desulfurization rate is accurately controlled, the waste caused by excessive spraying of the desulfurizer is avoided, and the waste caused by the fact that the desulfurizer is deposited in a flow channel due to concentrated spraying of the desulfurizer and large solid content of the desulfurizer mixed in the flue gas once due to the fact that the desulfurizer is sprayed for many times is not beneficial to carrying and mixing of the flue gas.
Furthermore, the inner cavity of the desulfurization mixer is divided into a U-shaped reducing pipeline by a bending plate. The bending plate is bent for multiple times to form a complex variable-diameter runner, and a round corner at the bending part is in transition to reduce wind resistance, so that the bending plate is simple in structure and convenient to process and install.
Still further, a rectifier is arranged in the first rectifying area and is positioned at the upstream of the first desulfurizer spray gun. The rectifier strengthens the rectification effect on the flue gas and strengthens the following first solid-gas mixing.
Still further, the diameter of the flue gas outlet flow channel is gradually narrowed to form a second gas flow nozzle. The gas flow is accelerated, the output from the desulfurization mixer is facilitated, and the mixing of the flue gas and the desulfurizer is strengthened again.
Furthermore, the injection direction of the first desulfurizer spray gun is inclined downwards, the injection direction of the second desulfurizer spray gun is inclined upwards, and the included angle between the injection direction and the horizontal direction is 15-30 degrees. Not only keeps certain consistency with the flowing direction of the flue gas and avoids the blockage of a spray gun, but also ensures the mixing time of the desulfurizer and the flue gas as much as possible and avoids the flue gas from falling and depositing at the bottom of the desulfurization mixer too fast.
Furthermore, the desulfurizer spray guns are arranged around the flow channel at intervals. The mixing of the flue gas and the desulfurizer is facilitated, and the injection dead angle is reduced as much as possible.
Further, the dry desulfurization device also comprises a desulfurizer conveying assembly, which comprises a mill, a desulfurizer powder bin and a desulfurizer conveying pump which are connected in sequence, wherein the lowest part of the bottom of the desulfurizer assembly is provided with a desulfurizer collecting port connected with the desulfurizer powder bin. After the device operates for a period of time, the desulfurizer deposited at the bottom of the reducing runner can be collected and reused
Furthermore, the flue gas outlet of the desulfurization component is provided with an induced draft fan. The induced draft fan is opened when necessary so as to facilitate the flow of the flue gas according to the control direction.
Furthermore, a variable frequency fan is arranged on the first hot blast stove, and the control unit is connected with the variable frequency fan through a control circuit so as to control the output of the first hot blast stove.
The beneficial effects of the utility model reside in that:
1. the dry desulfurization process link is accurately controlled in real time more finely, excessive operation or idling of the device is avoided, high process indexes are guaranteed, and the operation cost is effectively controlled;
2. the centralized difference control management of the desulfurization process is realized for different flue gases, the surplus heat of the flue gases can be effectively recovered to avoid waste when needed, or the flue gases are heated to a proper temperature interval value to provide proper flue gases for the subsequent process;
3. the reducing flow channel structure is beneficial to the retention of flue gas in the flue gas, the flue gas is fully mixed with the sprayed desulfurizer powder and then carries the desulfurizer powder to continue to move forward, the desulfurization is carried out gradually in the advancing process, and the desulfurization effect is good;
4. the desulfurizer is sprayed once or many times, waste caused by excessive spraying of the desulfurizer is avoided while the desulfurization rate is accurately controlled, and the waste caused by deposition of the desulfurizer in a flow channel due to concentrated spraying of the desulfurizer and large solid content of the desulfurizer mixed in flue gas at one time, which is not beneficial to carrying and mixing of the flue gas, can be avoided by spraying the desulfurizer many times.
Drawings
FIG. 1 is a schematic view of a connection structure of a dry desulfurization apparatus
FIG. 2 is a front perspective view of a desulfurization mixer cascade structure
FIG. 3 is a sectional view taken along line A-A in FIG. 2
In FIGS. 1 to 3: 1 is first hot-blast furnace, 2 is desulfurization subassembly, 201 is first air current nozzle, 202 is first rectifying area, 203 is first mixed area, 204 is the second mixed area, 205 is the second rectifying area, 206 is the board of bending, 207 is the rectifier, 208 is the second air current nozzle, 209 is the desulfurizer collection mouth, 3 is the desulfurizer spray gun, 301 is first desulfurizer spray gun, 302 is the second desulfurizer spray gun, 12 is the steam pocket, 18 is the mill, 19 is desulfurizer powder storehouse, 20 is desulfurizer delivery pump, 21 is the variable frequency fan.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
In the dry desulfurization unit shown in FIG. 1, the inlet of the unit is connected to the outlet of the unit or control valve A2 via control valve A1; the control valve A2 is connected with the desulfurization component 2 through a combined type waste heat boiler A8 or a first hot blast stove 1, a variable frequency fan 21 is arranged on the first hot blast stove 1, and steam output by a steam drum 12 of the combined type waste heat boiler A8 is connected with a steam heating pipeline through a steam pipeline.
The desulfurization component 2 comprises a plurality of desulfurization mixers, and each desulfurization mixer is at least internally provided with a desulfurizer spray gun 3; the flue gas outlet of the first desulfurization mixer T1 is connected with the flue gas inlet of the device outlet or the second desulfurization mixer T2 through a control valve A3, the flue gas outlet of the second desulfurization mixer T2 is connected with the flue gas inlet of the device outlet or the third desulfurization mixer T3 through a control valve A4, and … the flue gas outlet of the tail end desulfurization mixer Tn is connected with the device outlet through a control valve An + 2.
Upstream of the control valve A1, SO is provided2A concentration sensor, a temperature sensor T, a flow meter F and a humidity sensor H are arranged at the upstream of a control valve A2, and SO is arranged at the upstream of control valves A3, A4, … and An +12A concentration sensor and a flowmeter F, if a plurality of desulfurizer spray guns 3 are arranged in a single desulfurization mixer, SO is arranged between two adjacent desulfurizer spray guns 32A concentration sensor and a flow meter F.
As shown in fig. 1, in this embodiment, all the control valves A3, a4, …, An +2 at the outlet of the desulfurization mixer are connected to the outlet of the device through a control valve a0, the control valve a0 is located between the control valve a1 and the control valve B1, and the control valve a0 and the control valve a1 are linked to control the flue gas to move correctly.
The desulfurizer conveying assembly provides desulfurizer for the desulfurizer spray gun 3, and comprises a mill 18, a desulfurizer powder bin 19 and a desulfurizer conveying pump 20 which are connected in sequence.
As shown in fig. 2, taking the first desulfurization mixer T1 as an example, the flue gas inlet and outlet of the first desulfurization mixer T1 are both disposed at the top, and the inner cavity thereof is divided into a "U" shape-variable diameter pipeline by a bending plate 206:
the U-shaped vertical section on one side of the reducing flow channel sequentially comprises a first airflow nozzle 201 which is close to the flue gas inlet and formed by gradually narrowing the diameter of the flow channel, is used for accelerating airflow, and is beneficial to quickly mixing the flue gas with a desulfurizing agent which is sprayed subsequently after the flue gas quickly passes through the rectifier 207; the first rectifying area 202 is equal in diameter, and a rectifier 207 is arranged in the first rectifying area 202 and used for enhancing the rectifying effect on the flue gas and strengthening the following first solid-gas mixing; the first mixing area 203 formed by gradually widening the diameter of the flow channel slows down the airflow, prolongs the airflow staying space as much as possible and ensures that the solid and the gas are fully mixed; the first desulfurizer spray gun 301 is arranged in the first rectifying area 202 and is positioned in the rectifier 207.
The U-shaped vertical section on the other side of the variable-diameter flow channel sequentially comprises a first mixing area 203 and a second mixing area 204 with gradually widened flow channel diameter, the diameter of the tail end of the first mixing area 203 is smaller than or equal to the diameter of the head end of the second mixing area 204, the air flow is further slowed when passing through, the air flow staying flow space is prolonged, and the solid-gas mixing is fully ensured; the second rectifying area 205 is close to the flue gas outlet, the flue gas flow form is adjusted, and preparation is made for the flue gas to enter the next desulfurization mixer 2 or the next procedure; a second desulfurizer spray gun 302 is also arranged at the joint of the second mixing area 204 and the second rectifying area 205; the second rectifying section 205 is adjacent to the flue gas outlet, and the diameter of the flue gas outlet channel gradually narrows to form a second airflow nozzle 208, so that the airflow is accelerated, the output from the desulfurization mixer 2 is facilitated, and the mixing of the flue gas and the desulfurizing agent is enhanced again.
The first mixing area 203 and the second mixing area 204 are communicated through the U-shaped bottom section of the reducing flow channel, the bottom of the U-shaped bottom section of the reducing flow channel is conical, a desulfurizer collecting port 209 is arranged at the lowest position of the U-shaped bottom section of the reducing flow channel and is connected with the desulfurizer powder bin 19, and after the system runs for a period of time, the desulfurizer deposited at the bottom of the reducing flow channel can be collected and reused.
The spraying direction of the first desulfurizer spray gun 301 is inclined downwards, the spraying direction of the second desulfurizer spray gun 302 is inclined upwards, and the included angle between the spraying direction and the horizontal direction is 15-30 degrees; in fig. 2, the first desulfurizing agent spray gun 301 and the second desulfurizing agent spray gun 302 are two (only 1 is shown in the figure) respectively arranged at intervals around the position of the located flow channel, and in fig. 3, the first desulfurizing agent spray gun 301 is 3 arranged at intervals around the position of the located flow channel.
The device mainly comprises a short-circuit channel, a temperature adjusting module and a dry desulphurization module:
SO when controlling valve A1 upstream2When the concentration sensor monitors that the sulfur content of the flue gas entering the device is lower than the sulfur content control value of the flue gas, the flue gas directly enters the next working procedure through a short-circuit channel formed by a control valve A1 at the inlet of the device and a control valve A0 at the outlet of the device, and the flue gas does not need to flow in the device.
SO when controlling valve A1 upstream2Control method for controlling concentration sensor to monitor that sulfur content in flue gas entering device is not lower than sulfur content in flue gasWhen the value is positive, the flue gas passes through the temperature adjusting module and the dry desulphurization module in sequence:
in the temperature adjusting module, when the flue gas temperature is higher than the upper limit of the temperature control value of the desulfurized flue gas, the combined type waste heat boiler A8 is started, the flue gas passes through the combined type waste heat boiler A8, and the combined type waste heat boiler A8 recovers the heat of the flue gas to cool the flue gas to the range of the temperature control value of the desulfurized flue gas; when the flue gas temperature is less than the lower limit of the desulfurization flue gas temperature control value, the first hot blast stove 1 is started, the flue gas passes through the first hot blast stove 1, and the first hot blast stove 1 heats the flue gas to enable the temperature of the flue gas to rise to be within the range of the desulfurization flue gas temperature control value; when the flue gas temperature is in the range of the control value of the desulfurization flue gas temperature, the first hot blast stove 1 does not start the heating function, and the flue gas directly passes through the first hot blast stove 1.
In the dry desulfurization module, the first desulfurizing agent lance 301 in the first desulfurization mixer T1 is operated in accordance with SO upstream of the control valve A12The sulfur content of the flue gas monitored by the concentration sensor and the flue gas flow monitored by the flow meter F at the upstream of the control valve A2 are sprayed with a desulfurizer, the flue gas and the desulfurizer are mixed and move to the head end of the second mixing area 204, and the control unit compares the SO at the head end with the SO at the head end2The current control values of the sulfur content in the flue gas and the sulfur content in the flue gas, which are returned by the concentration sensor, flexibly select whether the second desulfurizer spray gun 302 in the first desulfurization mixer T1 needs to additionally spray a desulfurizer; when the smoke continues to move to the control valve A3, the control unit compares the SO at the control valve A with the SO at the control valve A2The current flue gas that concentration sensor returned contains sulphur content and flue gas and contains sulphur content control value, the nimble selection: a. finishing the desulfurization process, and enabling the flue gas to enter the next process link from the control valve A3; b. the flue gas continues to flow in the dry desulphurization device, the flue gas enters the second desulphurization mixer T2 from the control valve A3, and whether the first desulfurizer spray gun 301 in the second desulphurization mixer T2 needs to additionally spray desulfurizer or not is selected, and the spraying amount is continued until the current sulfur content of the flue gas is less than the control value of the sulfur content of the flue gas.
Example 1 denitration treatment of flue gas from cement kiln
SO in cement kiln flue gas2The content is 50mg/Nm3Has a dust content of 80%～150g/Nm3NOx content of about 800mg/Nm3The temperature of the flue gas is generally 150-320 ℃. When the cement kiln flue gas is desulfurized by the device, the temperature of the flue gas is reduced to 130-150 ℃ after the heat is recovered by cooling through the combined type waste heat boiler A8, and the flue gas is desulfurized by a dry method and is dedusted, and the desulfurization efficiency is over 95 percent.
Example 2 Coke oven flue gas denitration and desulfurization treatment
SO in coke oven flue gas2The content is generally 100-600 mg/Nm3Dust content of 200mg/Nm3NOx content 1000mg/Nm3The temperature of the flue gas is generally less than 280 ℃.
When the coke oven flue gas is desulfurized by the device, the temperature of the combined type waste heat boiler A is reduced, the heat is recovered, the temperature of the flue gas entering the dry-method desulfurizing device is controlled to be less than or equal to 220 ℃, under the condition that the sodium-sulfur ratio is 1.2, the dry-method desulfurizing efficiency can reach more than 97.5 percent according to the medium condition of the flue gas, the temperature of the flue gas after being desulfurized is 150-190 ℃, and the content of SO2 in the flue gas is reduced to 10mg/Nm3The following.
Example 3 lime kiln flue gas denitration treatment
SO in lime kiln flue gas2The content is 50mg/Nm3The dust content is 30g/Nm3The temperature of the flue gas is generally between 180 and 240 ℃.
When the lime kiln flue gas is subjected to dry desulfurization by the device, the combined type waste heat boiler A recovers heat, the temperature of the flue gas is 130 ℃ after the dry desulfurization and the dust removal, and the desulfurization efficiency is over 95 percent.
Claims (10)
1. A dry desulfurization device is characterized in that: the device inlet is connected to the device outlet or control valve a2 via control valve a 1;
the control valve A2 is connected with the desulphurization component (2) through a combined type waste heat boiler A (8) or a first hot blast stove (1), and a steam pipeline of the combined type waste heat boiler A (8) is connected with a steam heating pipeline;
the desulfurization component (2) comprises a plurality of desulfurization mixers, and each desulfurization mixer is at least internally provided with a desulfurizer spray gun (3); the flue gas outlet of the first desulfurization mixer T1 is connected with the outlet of the device or the flue gas inlet of the second desulfurization mixer T2 through a control valve A3, the flue gas outlet of the second desulfurization mixer T2 is connected with the outlet of the device or the flue gas inlet of the third desulfurization mixer T3 through a control valve A4, …, and the flue gas outlet of the tail end desulfurization mixer Tn is connected with the outlet of the device through a control valve An + 2;
upstream of the control valve A1, SO is provided2A concentration sensor, a temperature sensor T, a flow meter F and a humidity sensor H are arranged at the upstream of a control valve A2, and SO is arranged at the upstream of control valves A3, A4, … and An +12A concentration sensor and a flowmeter F, if a plurality of desulfurizer spray guns (3) are arranged in a single desulfurization mixer, SO is arranged between two adjacent desulfurizer spray guns (3)2A concentration sensor and a flow meter F.
2. The dry desulfurization apparatus according to claim 1, characterized in that: flue gas inlet and exhanst gas outlet of desulfurization blender all locate the top or be close to the top, the reducing runner of desulfurization blender inner chamber for being "U" shape:
the U-shaped vertical section on one side of the reducing flow passage sequentially comprises a first airflow nozzle (201) which is close to a flue gas inlet and is formed by gradually narrowing the diameter of the flow passage, a first rectifying area (202) with the same diameter and a first mixing area (203) formed by gradually widening the diameter of the flow passage; a first desulfurizer spray gun (301) is also arranged in the first rectifying area (202);
the U-shaped vertical section on the other side of the reducing flow channel sequentially comprises a second mixing area (204) which is close to the first mixing area (203) and gradually widens the diameter of the flow channel, the diameter of the tail end of the first mixing area (203) is less than or equal to the diameter of the head end of the second mixing area (204), and a second rectifying area (205) with the same diameter; a second desulfurizer spray gun (302) is also arranged at the joint of the second mixing area (204) and the second rectifying area (205); the second rectifying section (205) is adjacent to the flue gas outlet;
the first mixing area (203) and the second mixing area (204) are communicated through a U-shaped bottom section of the reducing flow passage.
3. The dry desulfurization apparatus according to claim 2, characterized in that: the inner cavity of the desulfurization mixer is divided into a U-shaped reducing pipeline by a bending plate (206).
4. The dry desulfurization apparatus according to claim 2, characterized in that: a rectifier (207) is arranged in the first rectifying area (202), and the rectifier (207) is positioned at the upstream of the first desulfurizer spray gun (301).
5. The dry desulfurization apparatus according to claim 2, characterized in that: the flue gas outlet flow passage gradually narrows in diameter to form a second gas flow nozzle (208).
6. The dry desulfurization apparatus according to claim 2, characterized in that: the spraying direction of the first desulfurizer spray gun (301) is inclined downwards, the spraying direction of the second desulfurizer spray gun (302) is inclined upwards, and the included angle between the spraying direction and the horizontal direction is 15-30 degrees.
7. The dry desulfurization apparatus according to claim 1, characterized in that: the desulfurizer spray guns (3) are arranged around the flow passage at intervals.
8. The dry desulfurization apparatus according to claim 1, characterized in that: the dry desulfurization device also comprises a desulfurizer conveying assembly, which comprises a mill (18), a desulfurizer powder bin (19) and a desulfurizer conveying pump (20) which are connected in sequence, wherein the lowest part of the bottom of the desulfurization assembly (2) is provided with a desulfurizer collecting port (209) which is connected with the desulfurizer powder bin (19).
9. The dry desulfurization apparatus according to claim 1, characterized in that: and a draught fan is arranged at a flue gas outlet of the desulfurization component (2).
10. The dry desulfurization apparatus according to claim 1, characterized in that: the first hot blast stove (1) is provided with a variable frequency fan (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922264856.0U CN211411566U (en) | 2019-12-16 | 2019-12-16 | Dry desulfurization device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922264856.0U CN211411566U (en) | 2019-12-16 | 2019-12-16 | Dry desulfurization device |
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| CN211411566U true CN211411566U (en) | 2020-09-04 |
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Denomination of utility model: A dry desulfurization device Effective date of registration: 20231211 Granted publication date: 20200904 Pledgee: Bank of China Limited Jingzhou Branch Pledgor: HUBEI SIBOYING ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2023980070472 |