CN210814723U - High-temperature dust removal, desulfurization and denitrification device for cement kiln - Google Patents

High-temperature dust removal, desulfurization and denitrification device for cement kiln Download PDF

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CN210814723U
CN210814723U CN201921749279.8U CN201921749279U CN210814723U CN 210814723 U CN210814723 U CN 210814723U CN 201921749279 U CN201921749279 U CN 201921749279U CN 210814723 U CN210814723 U CN 210814723U
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flue gas
temperature
ammonia
desulfurization
kiln
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郑勇
吕文彬
苏龙龙
程浩
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Tongxing Environmental Protection Technology Co ltd
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Tongxing Environmental Protection Technology Co ltd
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Abstract

The utility model discloses a cement kiln high temperature dust removal SOx/NOx control device, cement kiln flue gas gets into the decomposition kiln from the rotary kiln and arrives the pre-heater again, flue gas after coming out from the pre-heater removes dust through the dust remover, flue gas after the dust removal gets into high temperature SCR denitrification facility after the ammonia that pipeline and ammonia evaporator came out mixes, under the catalytic action of catalyst, a series of chemical reaction takes place for the nitrogen oxide in ammonia and the flue gas, generate nitrogen gas and vapor, go into the exhaust-heat boiler after passing through denitration main fan again, carry to desulphurization unit by high temperature fan again, flue gas after the desulfurization is accomplished is through the direct vent chimney behind the kiln tail dust remover. This device can carry out more thorough purification to the cement kiln flue gas, makes the pollutant in the cement kiln flue gas reach the current emission standard of country, has solved cement kiln flue gas dust removal SOx/NOx control thoroughly, the too big, the aqueous ammonia consumption of system unit pressure drop is too big, denitration catalyst blocks up, catalyst life hangs down the scheduling problem.

Description

High-temperature dust removal, desulfurization and denitrification device for cement kiln
Technical Field
The utility model relates to a cement kiln flue gas processing apparatus technical field specifically is a cement kiln high temperature dust removal SOx/NOx control device.
Background
Since 7/1/2015, the existing cement enterprises begin to strictly execute GB 4915-2013 'emission Standard for atmospheric pollutants for Cement industry', and the NOx emission values of the existing and newly-built cement enterprises are required to be reduced from original 800mg/Nm3(NO2@ 10% O2, the same below) to 400mg/Nm3 (the NOx emission limit in some regions is 320mg/Nm 3).
In recent years, the nation has started to vigorously implement the ultra-low emission modification of flue gas in the non-electric field, the ultra-low emission modification of flue gas of a cement kiln has been proposed, and a plurality of provinces have already been provided with policy documents such as local standards and working schemes for preventing and treating air pollution, and the like, and the emission concentrations of particulate matters, sulfur dioxide and nitrogen oxides in the flue gas of the cement kiln are required to be controlled to be not higher than 10mg/m3、50mg/m3150 (or 100) mg/m3. Therefore, the flue gas of the existing or newly-built cement kiln must be subjected to desulfurization, denitrification and dedusting treatment.
At present, most cement industries still adopt SNCR denitration, but the SNCR denitration efficiency is not high and can only reach 60%, if the requirement of environmental protection on the cement industry is stricter, the original SNCR denitration cannot meet the environmental protection requirement, the SCR denitration is more efficient than the SNCR denitration, the ammonia water consumption is small, and the SCR denitration is widely applied to the fields of coking, power generation, sintering and the like. Therefore, the SCR denitration device for the cement kiln flue gas is urgently needed to be designed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cement kiln high temperature dust removal SOx/NOx control device to solve the not up to standard that current cement trade flue gas was administered, SCR catalyst blocks up, the inefficiency scheduling problem of denitration.
In order to achieve the above object, the utility model provides a following technical scheme: a high-temperature dust removal, desulfurization and denitrification device for a cement kiln comprises a rotary kiln, a decomposition kiln, a preheater, a dust remover, a high-temperature SCR (selective catalytic reduction) denitrification device, a denitrification main fan, a waste heat boiler, a high-temperature fan, a desulfurization device and a kiln tail dust remover, wherein the smoke outlet end of the rotary kiln is butted with the smoke inlet end of the decomposition kiln, the decomposition kiln is connected with the preheater, the outlet end of the preheater is connected with the dust remover through a pipeline, an ammonia water evaporator is connected in parallel to the outlet pipeline of the dust remover and mixed with ammonia gas at the outlet end of the ammonia water evaporator to enter the high-temperature SCR denitrification device, the outlet end of the high-temperature SCR denitrification device is connected with the denitrification main fan, the outlet end of the denitrification main fan is connected to the waste heat boiler through a pipeline, the other;
the high-temperature SCR denitration device internally comprises a guide plate, an homogenization layer and a catalyst layer; flue gas after the dust remover removes dust mixes with the ammonia in the ammonia water evaporimeter and gets into high temperature SCR denitrification facility entrance point to make the flue gas even after guide plate water conservancy diversion, make flue gas and ammonia homogeneous mixing through the homogenization layer again, under the catalytic action of catalyst, discharge by high temperature SCR denitrification facility bottom outlet after accomplishing the denitration.
Preferably, the ammonia water evaporator adopts a two-fluid spray gun, the inlet end of the ammonia water evaporator is respectively connected with an ammonia water pump and a dilution fan through pipelines, the other end of the ammonia water pump is connected with an ammonia water tank, and the other end of the dilution fan is connected in parallel on a connecting pipeline of the denitration main fan and the waste heat boiler.
Preferably, the catalyst in the high-temperature SCR denitration device adopts a + form, and two layers of catalysts and one reserved layer are laid.
Preferably, the dust remover is one of a bag-type dust remover, an electric dust remover and a ceramic tube dust remover.
Preferably, the inlet end of the desulfurization device is connected with the outlet end of the desulfurization mill through a pipeline, the inlet end of the desulfurization mill is connected with a desulfurizer powder bin, and the other end of the outlet pipeline of the desulfurizer powder bin is connected with a roots blower.
Preferably, a first high-temperature butterfly valve is installed on a connecting pipeline of the dust remover and the preheater and is connected with a branch pipe in parallel, a second high-temperature butterfly valve is installed on the branch pipe, the other end of the branch pipe is connected with a connecting pipeline of the main denitration fan and the waste heat boiler in parallel, and a third high-temperature butterfly valve is installed on an outlet pipeline of the main denitration fan.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the cement kiln high-temperature dust removal desulfurization and denitrification device can be used for jointly treating sulfur dioxide, nitrogen oxide, dust and the like in cement kiln flue gas, a dust remover is additionally arranged in a pipeline between a preheater and the high-temperature SCR denitrification device, the dedusted flue gas enters the high-temperature SCR denitrification device after being mixed with ammonia gas discharged from an ammonia water evaporator through a conveying pipeline, and a guide plate is additionally arranged at the inlet of the high-temperature SCR denitrification device, so that the flue gas can be uniformly fed into a denitrification tower, and the local resistance of a system is greatly reduced; an homogenization layer is arranged in the high-temperature SCR denitration device, so that flue gas and ammonia gas are uniformly mixed, the denitration efficiency is greatly increased, and the escape of ammonia at an outlet is reduced; the catalyst in the high-temperature SCR denitration device adopts a 2+1 form, and 2 layers of catalysts and one layer of reserved layer are laid, so that the cement kiln flue gas can be thoroughly purified, and pollutants in the cement kiln flue gas can reach the national existing emission standard.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is the utility model discloses a high temperature SCR denitrification facility inner structure schematic diagram.
In the figure: 1. a rotary kiln; 2. a decomposition kiln; 3. a preheater; 4. a first high temperature butterfly valve; 5. a dust remover; 6. a baffle; 7. an homogenization layer; 8. a catalyst layer; 9. a high-temperature SCR denitration device; 10. a denitration main fan; 11. a third high temperature butterfly valve; 12. a waste heat boiler; 13. a high temperature fan; 14. a desulfurization unit; 15. a kiln tail dust remover; 16. a dilution fan; 17. an ammonia tank; 18. an ammonia pump; 19. an ammonia water evaporator; 20. a second high temperature butterfly valve; 21. a desulfurizer powder bin; 22. a Roots blower; 23. a desulfurization mill.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, a cement kiln high-temperature dust removal desulfurization and denitrification device comprises a rotary kiln 1, a decomposition kiln 2, a preheater 3, a dust remover 5, a high-temperature SCR denitrification device 9, a main denitrification fan 10, a waste heat boiler 12, a high-temperature fan 13, a desulfurization device 14 and a kiln tail dust remover 15, wherein the flue gas outlet end of the rotary kiln 1 is butted with the flue gas inlet end of the decomposition kiln 2, the decomposition kiln 2 is connected with the preheater 3, the outlet end of the preheater 3 is connected with the dust remover 5 through a pipeline, an ammonia water evaporator 19 is connected in parallel to the outlet pipeline of the dust remover 5, and mixed with ammonia gas at the outlet end of the ammonia water evaporator 19 and then enters the high-temperature SCR denitrification device 9, the outlet end of the high-temperature SCR denitrification device 9 is connected with the main denitrification fan 10, the outlet end of the main denitrification fan 10 is connected with the waste heat boiler 12 through a, the outlet end of the desulfurization device 14 is connected with a kiln tail dust remover 15;
wherein, the high-temperature SCR denitration device 9 contains a guide plate 6, a homogenizing layer 7 and a catalyst layer 8; the flue gas dedusted by the deduster 5 and ammonia gas in the ammonia water evaporator 19 are mixed and enter the inlet end of the high-temperature SCR denitration device 9, are guided by the guide plate 6 to be uniform, are uniformly mixed with the ammonia gas by the homogenization layer 7, and are discharged from the bottom outlet of the high-temperature SCR denitration device 9 after denitration is completed under the catalytic action of the catalyst layer 8; the homogenization layer 7 enables the flue gas and the ammonia gas to be uniformly mixed, so that the denitration efficiency is greatly increased, and the escape of the ammonia at an outlet is reduced; the guide plate 6 can make the flue gas even when entering the high-temperature SCR denitration device 9, and the local resistance of the system is greatly reduced.
In the above embodiment, the ammonia water evaporator 19 adopts a two-fluid spray gun, the inlet end of the ammonia water evaporator 19 is respectively connected with the ammonia water pump 18 and the dilution fan 16 through pipelines, the other end of the ammonia water pump 18 is connected with the ammonia water tank 17, the other end of the dilution fan 16 is connected in parallel on the connecting pipeline of the denitration main fan 10 and the exhaust-heat boiler 12, 20% ammonia water coming out of the ammonia water evaporator 19 is mixed with high-temperature flue gas extracted by the dilution fan 16 after being gasified, and enters the high-temperature SCR denitration device 9, the ammonia water is gasified by adopting the high-temperature flue gas after the original denitration of the system in the ammonia water preparation process, so that the operation cost is reduced, and in the ammonia water preparation process, an ammonia water regulating valve is arranged on the.
In the above embodiment, the catalyst layer 8 in the high-temperature SCR denitration device 9 is in a 2+1 form, and two layers of catalysts and one reserved layer are laid.
In the above embodiment, the dust collector 5 is one of a bag dust collector, an electric dust collector and a ceramic tube dust collector, high-temperature flue gas from the preheater 3 contains high dust, and dust in the high-temperature SCR denitration device 9 can be greatly reduced after dust is removed by the dust collector 5, so that the possibility of catalyst blockage is reduced.
In the above embodiment, the inlet end of the desulfurization device 14 is connected to the outlet end of the desulfurization mill 23 through a pipeline, the inlet end of the desulfurization mill 23 is connected to the desulfurizer powder bin 21, and the other end of the outlet pipeline of the desulfurizer powder bin 21 is connected to the roots blower 22.
In the above embodiment, the first high temperature butterfly valve 4 is installed on the connection pipeline between the dust remover 5 and the preheater 3, and a branch pipe is connected in parallel, the second high temperature butterfly valve 20 is installed on the branch pipe, the other end of the branch pipe is connected in parallel to the connection pipeline between the main denitration fan 10 and the exhaust-heat boiler 12, and the third high temperature butterfly valve 11 is installed on the outlet pipeline of the main denitration fan 10.
The working principle is as follows: the cement kiln high-temperature dust removal desulfurization and denitrification device has the advantages that cement kiln flue gas enters the decomposition kiln 2 from the rotary kiln 1 and then enters the preheater 3, the temperature of the flue gas after exiting from the preheater 3 is about 300-400 ℃, the flue gas is dedusted by the deduster 5, the dedusted flue gas is mixed with ammonia gas exiting from the ammonia water evaporator 19 through the conveying pipeline and then enters the high-temperature SCR denitrification device 9, the ammonia gas and nitrogen oxide in the flue gas are subjected to chemical reaction under the catalytic action of a catalyst to generate nitrogen gas and water vapor, the nitrogen gas and the water vapor enter the waste heat boiler 12 after passing through the denitrification main fan 10 and then are conveyed to the desulfurization device 14 through the high-temperature fan 13, and the desulfurized flue gas is directly discharged into a chimney after passing through;
wherein, the ammonia preparation adopts the high temperature flue gas after the original denitration of system to gasify the aqueous ammonia, reduces the running cost, and in the aqueous ammonia preparation process, the aqueous ammonia governing valve is equipped with on the aqueous ammonia pipeline, adjust the aqueous ammonia quantity according to the system needs, the ammonia that the evaporation was accomplished is even after ammonia buffer sprays into the denitration tower by spraying ammonia branch pipe and mixes with the flue gas, under the effect of catalyst, the ammonia carries out a series of chemical reactions with the nitrogen oxide in the flue gas, generate nitrogen and vapor, concrete reaction equation is as follows:
4NO+4NH3+O2→4N2+6H2O;
6NO+4NH3→5N2+6H2O;
6NO2+8NH3→3N2+6H2O;
2O2+4NH3+O2→3N2+6H2O
when the catalyst reaches or is close to the service life, a new catalyst layer can be additionally arranged on the catalyst layer 8 to ensure the denitration efficiency of the whole system, the denitrated flue gas passes through the waste heat boiler 12, and the high-temperature flue gas can be used for producing steam required by a plant area, so that the operation cost is greatly reduced.
The flue gas from the main denitration fan 10 contains high-concentration sulfur dioxide, so a desulfurization device 14 is additionally arranged in front of the kiln tail dust remover 15 for desulfurization, and the specific reaction equation is as follows:
2NaHCO3+SO2+1/2O2→NaSO4+2CO2+H2O
2NaHCO3+SO3→NaSO4+2CO2+H2O
in summary, the following steps: the high-temperature dust removal desulfurization and denitrification device for the cement kiln can be used for jointly treating sulfur dioxide, nitrogen oxide, dust and the like in the flue gas of the cement kiln, the dust remover 5 is additionally arranged between the preheater 3 and the high-temperature SCR denitrification device 9 through a pipeline, the dedusted flue gas enters the high-temperature SCR denitrification device 9 after being mixed with ammonia gas discharged from the ammonia water evaporator 19 through a conveying pipeline, and the guide plate 6 is additionally arranged at the inlet of the high-temperature SCR denitrification device 9, so that the flue gas can uniformly enter a denitrification tower, and the local resistance of the system is greatly reduced; the homogenization layer 7 is arranged in the high-temperature SCR denitration device 9, so that flue gas and ammonia gas are uniformly mixed, the denitration efficiency is greatly increased, and the escape of ammonia at an outlet is reduced; the catalyst in the high-temperature SCR denitration device 9 adopts a 2+1 form, and 2 layers of catalyst and one layer of reserved layer are laid, so that the cement kiln flue gas can be thoroughly purified, and pollutants in the cement kiln flue gas can reach the national existing emission standard.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a cement kiln high temperature dust removal SOx/NOx control device, includes rotary kiln (1), decomposition kiln (2), pre-heater (3), dust remover (5), high temperature SCR denitrification facility (9), denitration main air fan (10), exhaust-heat boiler (12), high temperature fan (13), desulphurization unit (14), kiln tail dust remover (15), its characterized in that: the flue gas outlet end of the rotary kiln (1) is in butt joint with the flue gas inlet end of the decomposition kiln (2), the decomposition kiln (2) is connected with a preheater (3), the outlet end of the preheater (3) is connected with a dust remover (5) through a pipeline, an ammonia water evaporator (19) is connected in parallel on an outlet pipeline of the dust remover (5), the ammonia gas is mixed with the ammonia gas at the outlet end of the ammonia water evaporator (19) and then enters a high-temperature SCR denitration device (9), the outlet end of the high-temperature SCR denitration device (9) is connected with a denitration main fan (10), the outlet end of the denitration main fan (10) is connected to a waste heat boiler (12) through a pipeline, the other end of the waste heat boiler (12) is connected with a high-temperature fan (13), the discharge port of the high-temperature fan (13);
the high-temperature SCR denitration device (9) internally comprises a guide plate (6), an homogenization layer (7) and a catalyst layer (8); flue gas after dust removal of the dust remover (5) and ammonia in the ammonia water evaporator (19) are mixed and enter the inlet end of the high-temperature SCR denitration device (9), the flue gas is guided by the guide plate (6) to be uniform, the flue gas and the ammonia are uniformly mixed by the homogenization layer (7), and the flue gas is discharged from the bottom outlet of the high-temperature SCR denitration device (9) after denitration is completed under the catalytic action of the catalyst layer (8).
2. The cement kiln high-temperature dust removal, desulfurization and denitrification device according to claim 1, characterized in that: the ammonia water evaporator (19) adopts a double-fluid spray gun, the inlet end of the ammonia water evaporator (19) is respectively connected with an ammonia water pump (18) and a dilution fan (16) through pipelines, the other end of the ammonia water pump (18) is connected with an ammonia water tank (17), and the other end of the dilution fan (16) is connected in parallel on a connecting pipeline of the denitration main fan (10) and the waste heat boiler (12).
3. The cement kiln high-temperature dust removal, desulfurization and denitrification device according to claim 1, characterized in that: a catalyst layer (8) in the high-temperature SCR denitration device (9) adopts a 2+1 form, and two layers of catalysts and a reserved layer are laid.
4. The cement kiln high-temperature dust removal, desulfurization and denitrification device according to claim 1, characterized in that: the dust remover (5) is one of a bag-type dust remover, an electric dust remover and a ceramic tube dust remover.
5. The cement kiln high-temperature dust removal, desulfurization and denitrification device according to claim 1, characterized in that: the inlet end of the desulfurization device (14) is connected with the outlet end of the desulfurization mill (23) through a pipeline, the inlet end of the desulfurization mill (23) is connected with the desulfurizer powder bin (21), and the other end of the outlet pipeline of the desulfurizer powder bin (21) is connected with the Roots blower (22).
6. The cement kiln high-temperature dust removal, desulfurization and denitrification device according to claim 1, characterized in that: install first high temperature butterfly valve (4) on the connecting pipeline of dust remover (5) and pre-heater (3), and the parallel connection has a bleeder, installs second high temperature butterfly valve (20) on the bleeder, and the other end of bleeder connects in parallel on the connecting tube of denitration main blower (10) and exhaust-heat boiler (12), and installs third high temperature butterfly valve (11) on the outlet pipeline of denitration main blower (10).
CN201921749279.8U 2019-10-17 2019-10-17 High-temperature dust removal, desulfurization and denitrification device for cement kiln Active CN210814723U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111879132A (en) * 2020-08-03 2020-11-03 黄震 Device and method for denitration of cement kiln flue gas
CN112275132A (en) * 2020-10-19 2021-01-29 昆岳互联环境技术(江苏)有限公司 Dry desulfurization and denitrification system and desulfurization and denitrification method
CN114887409A (en) * 2022-04-26 2022-08-12 成都易态科技有限公司 Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas
CN115307154A (en) * 2022-06-29 2022-11-08 成都易态科技有限公司 Method and device for purifying waste incineration flue gas
CN115671910A (en) * 2022-06-30 2023-02-03 成都易态科技有限公司 High-temperature flue gas purification device of cement burning clinker cooling machine and cement production system
CN114887409B (en) * 2022-04-26 2024-07-05 成都易态科技有限公司 Method for efficiently combining high-temperature flue gas waste heat utilization, dust removal and denitration

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111879132A (en) * 2020-08-03 2020-11-03 黄震 Device and method for denitration of cement kiln flue gas
CN112275132A (en) * 2020-10-19 2021-01-29 昆岳互联环境技术(江苏)有限公司 Dry desulfurization and denitrification system and desulfurization and denitrification method
CN112275132B (en) * 2020-10-19 2022-05-27 昆岳互联环境技术(江苏)有限公司 Dry desulfurization and denitrification system and desulfurization and denitrification method
CN114887409A (en) * 2022-04-26 2022-08-12 成都易态科技有限公司 Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas
CN114887409B (en) * 2022-04-26 2024-07-05 成都易态科技有限公司 Method for efficiently combining high-temperature flue gas waste heat utilization, dust removal and denitration
CN115307154A (en) * 2022-06-29 2022-11-08 成都易态科技有限公司 Method and device for purifying waste incineration flue gas
CN115671910A (en) * 2022-06-30 2023-02-03 成都易态科技有限公司 High-temperature flue gas purification device of cement burning clinker cooling machine and cement production system

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