CN112007509A - Treatment process for dedusting and denitration of tail gas of rotary kiln - Google Patents
Treatment process for dedusting and denitration of tail gas of rotary kiln Download PDFInfo
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- CN112007509A CN112007509A CN202010877714.6A CN202010877714A CN112007509A CN 112007509 A CN112007509 A CN 112007509A CN 202010877714 A CN202010877714 A CN 202010877714A CN 112007509 A CN112007509 A CN 112007509A
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- denitration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a treatment process for dedusting and denitration of tail gas of a rotary kiln, which is particularly suitable for treating tail gas of a lime rotary kiln. The treatment process comprises the following steps: high-temperature flue gas discharged from the tail of a rotary kiln firstly enters a preheater to preheat materials, and the temperature of the flue gas discharged from the preheater is reduced to 210-240 ℃ by adjusting a cold air valve at the top of the preheater; the cooled flue gas enters a dedusting and denitration reactor for dedusting and denitration; the purified flue gas is sent into a chimney under the action of a draught fan. According to the process provided by the invention, the process conditions of integrated treatment of dust removal and denitration can be realized by adjusting the cold air valve at the top of the preheater, so that the complex flow of firstly cooling, dedusting and then heating for denitration in the existing process is simplified, and a good dust removal and denitration effect is achieved. The corresponding flue gas treatment system can be simplified, and the occupied area of the flue gas treatment system can be saved.
Description
Technical Field
The invention relates to a kiln tail gas treatment process, in particular to a rotary kiln tail gas dedusting and denitration treatment process.
Background
In recent years, with the rapid increase of the demand of lime in the steel industry, the refractory industry, the calcium carbide industry and the like, the number of lime kilns in China also rapidly increases. The lime roasting kilns most commonly used in China comprise rotary kilns, shaft kilns and the like, wherein the flue gas of the rotary kiln has the following characteristics: a. the smoke discharging temperature is higher (300 ℃ to 280 ℃); b.SO2The concentration is low, and the emission standard can be achieved; c. NOXThe concentration is higher, generally more than 600mg/Nm 3. NOXAnd dust is discharged out of the standard, the environment for our living is greatly damaged, if people inhale the medicine for a long time, respiratory diseases such as bronchus and lung can be caused, and if the average respiratory concentration of the medicine for 24 hours exceeds 150mg/m3The harmful dust can cause fatal danger to human bodies. The flue gas of the kiln is urgently needed to be subjected to denitration and dust removal treatment, and the flue gas is subjected to purification treatment to ensure that the flue gas reaches the standard and is discharged.
Referring to the attached figure 1, the existing kiln flue gas denitration and dust removal treatment process comprises the following steps: the flue gas (240 ℃) from the preheater is mixed with air and cooled to about 180 ℃, and then enters a bag-type dust collector to remove particulate matters in the flue gas. The flue gas after dust removal and purification enters a heater to be heated to about 220 ℃, and then enters an SCR denitration reactor, and NO in the flue gas enters the reactorxThe ammonia water injected into the flue and the ammonia water are subjected to selective catalytic reduction reaction on the surface of the catalyst to be decomposed into N2And H2And O. And discharging the purified flue gas to the atmosphere from a chimney.
The existing rotary kiln tail gas dedusting and denitration process has the defects that: the dedusting and denitration process is complex, the energy consumption is large due to the fact that the temperature is increased after the temperature is reduced, the efficiency is low, the occupied area of dedusting and denitration equipment is large, and the dedusting and denitration equipment is difficult to arrange under the condition that the field is narrow.
Disclosure of Invention
The invention aims to provide a treatment process for dedusting and denitration of tail gas of a rotary kiln. Compared with the traditional dedusting and denitration process, the process is simplified, the synchronous removal of dust and nitrogen oxides can be realized, the dedusting and denitration efficiency is higher, and the occupied area is smaller.
In order to solve the problems, the invention adopts the following technical scheme:
a rotary kiln tail gas dedusting and denitration treatment process comprises the following steps:
high-temperature flue gas discharged from the tail of the rotary kiln firstly enters a preheater to preheat materials,
cooling the flue gas from the preheater to 210-240 ℃ by adjusting a cold air valve at the top of the preheater;
the cooled flue gas enters a dedusting and denitration reactor for dedusting and denitration;
the purified flue gas is sent into a chimney under the action of a draught fan.
Furthermore, a spray gun is arranged at an inlet of the preheater, ammonia water with certain concentration is sprayed in, and SNCR denitration process treatment can be carried out on high-temperature flue gas.
Furthermore, the concentration of ammonia water used for SNCR denitration process treatment is 5 wt% -10 wt%.
Furthermore, a dust removal and denitration integrated catalytic filter bag is arranged in the denitration and dust removal reactor.
Furthermore, pulse ash removal is adopted in the denitration dust removal reactor, and the catalytic filter bag is periodically swept.
Further, the catalytic filter bag comprises an inner layer and an outer layer.
Furthermore, the outer layer of the catalytic filter bag is an outer layer cloth bag with a PTFE (polytetrafluoroethylene) coated film.
Further, the inner layer of the catalysis filter bag is a catalysis layer impregnated with honeycomb-shaped catalysts.
The invention has the advantages that the dust removal and denitration are synchronously carried out in one device, so that the tail gas treatment process of the rotary kiln is simplified, the corresponding flue gas treatment equipment is simplified, the dust removal and denitration efficiency is higher, and the occupied area is smaller.
Because the process of filtering and dedusting firstly and then removing nitrogen oxide is adopted, the influence of dust on the catalyst is effectively avoided, and the anti-poisoning capability of the catalyst is provided, so that the efficiency of catalytic reaction is improved, and the service life of the catalytic filter bag is effectively prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a traditional treatment process diagram for dedusting and denitration of tail gas of a rotary kiln;
FIG. 2 is a new treatment process diagram for dedusting and denitration of tail gas of a rotary kiln according to the invention;
FIG. 3 is a device for dedusting, denitration and treatment of tail gas of a rotary kiln according to the invention.
Wherein, 1-rotary kiln; 2-a preheater; 3-a dust removal denitration reactor; 4-main induced draft fan; 5-ammonia tank car; 6-ammonia unloading pump; 7-ammonia water storage tank; an 8-ammonia water supply pump; 9-a desalted water storage tank; 10-demineralized water supply pump; 11-pipeline static mixer; 12-a metering and dispensing module; 13-SNCR spraying device; 14-cloth bag denitration spraying device; 15-pit pool; 16-a waste water pump; 21-cold air valve.
Detailed Description
The invention relates to a treatment process for dedusting and denitration of tail gas of a rotary kiln.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2 and 3, the rotary kiln tail gas denitration and dust removal treatment process flow chart specifically comprises the following steps:
high-temperature flue gas (the temperature is about 1000 ℃) discharged from the tail of a rotary kiln 1 firstly enters a preheater 2 to preheat materials; then, regulating the temperature of the flue gas from the preheater 2 at 210-240 ℃ by cold air; then enters a dust removal denitration reactor 3 for dust removal and denitration; the purified flue gas (210 ℃) is sent to a chimney under the action of a main induced draft fan 4 and is discharged after reaching the standard.
Preferably, concentrated ammonia water with the concentration of about 20 wt% is delivered to the site by an ammonia water tank truck 5 and is unloaded to an ammonia water storage tank 7 by an ammonia unloading pump 6; metering concentrated ammonia water fed from an ammonia water storage tank 7 through an ammonia water supply pump 8 and demineralized water fed from a demineralized water storage tank 9 through a demineralized water supply pump 10, and mixing and diluting in a pipeline static mixer 11, wherein the concentration is controlled to be 5-10 wt%; the diluted ammonia water passes through a metering distribution module 12 and then is respectively sent to the lower part of a preheater 2 and an inlet flue of a dedusting and denitration reactor 3; SNCR denitration reaction is carried out at the lower part of the preheater 2 to remove part of NOx(-50%); the ammonia water at the inlet of the dust removal and denitration reactor 3 is directly gasified by the hot flue gas in the flue and is fully mixed with the flue gas through a flue gas static mixer.
The SNCR denitration technology, namely Selective Non-Catalytic Reduction denitration technology, is characterized in that a reducing agent (such as ammonia gas, urea or ammonia water and the like) containing NHx groups is sprayed into a kiln at the temperature of 850-1100 ℃ without using a catalyst to reduce NOx in smoke into N2And H2And (3) denitration technology of O.
The flue gas temperature of the rotary kiln enters an inlet of the preheater 2 (namely a feed opening of the preheater 2) and is about 1000 ℃, thus meeting the SNCR reaction temperature condition. Therefore, spray guns can be installed around the cross section to inject ammonia water with a concentration of about 10 wt% to remove-50% of NOx from the flue gas.
In a proper temperature region, ammonia water is used as a reducing agent, and the reaction equation is as follows:
4NO+4NH3+O2→4N2+6H2O
2NO+4NH3+2O2→3N2+6H2O
6NO2+8NH3→7N2+12H2O
in the dust-removing denitration reactor 3, dust-removing is installedA denitration integrated catalytic filter bag; the flue gas passes through the catalytic filter bag to realize two processes of dust removal and denitration in turn. In order to ensure the normal operation of dust removal and denitration, pulse ash removal is adopted in the reactor, and the filter bag is periodically purged; NO in flue gasxReacts with the reducing agent (ammonia water) sprayed by the cloth bag denitration spraying device 14 under the action of the catalytic filter bag to be reduced into N2And H2O。
Preferably, the integrated technology of dust removal and denitration by the catalytic cloth bag is a technology combining surface filtration and catalytic reaction, and the synchronous removal of dust and nitrogen oxides is realized in one device. The catalytic filter bag usually comprises an inner layer and an outer layer, wherein the outer layer is a high-precision filter layer, and the inner layer is a catalytic layer carrying a honeycomb catalyst. The flue gas flows through the catalytic filter bag from outside to inside, dust and harmful alkaline metals in the flue gas are intercepted and filtered by filter cakes on the surface of the filter bag, and clean flue gas containing nitrogen oxides and a reducing agent perform chemical reaction under the action of a catalyst in a catalytic layer, so that the nitrogen oxides in the flue gas are decomposed into N2And H2And O. Because the process of filtering and dedusting firstly and then removing nitrogen oxide is adopted, the influence of dust on the catalyst is effectively avoided, and the anti-poisoning capability of the catalyst is improved, so that the efficiency of catalytic reaction is improved, and the service life of the catalytic filter bag is effectively prolonged.
The reaction mechanism is as follows: firstly, a reducing agent spraying and mixing section (injecting 10 wt% of ammonia water); the injection amount can change NOx, CO and VOCs into N according to the actual gas composition2、CO2And H2The O case is specifically designed. ② the dust in the gas is removed from the surface layer of the filter. ③ conversion of NOx, CO and VOCs into N by catalytic reaction2、CO2And H2O。
The chemical reaction that takes place in the zone is:
4NO+4NH3+O2→4N2+6H2O
NO+NO2+2NH3→2N2+3H2O
preferably, the catalytic filter cloth bag comprises an outer cloth bag with a PTFE coating, and an inner catalytic cloth bag impregnated with honeycomb catalyst is arranged in the outer cloth bag. Because the outer layer cloth bag intercepts and filters dust in the flue gas, the catalysis cloth bag does not need to be filtered again, and the inner bag does not have a film. When the flue gas enters the inner-layer catalytic filter bag, the dust is filtered and removed by the outer-layer cloth bag, so that the moderate risk and abrasion of the inner-bag catalyst are reduced.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A rotary kiln tail gas dedusting and denitration treatment process comprises the following steps:
high-temperature flue gas discharged from the tail of the rotary kiln firstly enters a preheater to preheat materials,
cooling the flue gas from the preheater to 210-240 ℃ by adjusting a cold air valve at the top of the preheater;
the cooled flue gas enters a dedusting and denitration reactor for dedusting and denitration;
the purified flue gas is sent into a chimney under the action of a draught fan.
2. The rotary kiln tail gas dedusting and denitration treatment process as claimed in claim 1, wherein a spray gun is arranged at an inlet of the preheater, ammonia water with a certain concentration is sprayed, and SNCR denitration treatment can be performed on high-temperature flue gas.
3. The rotary kiln tail gas dedusting and denitration treatment process as claimed in claim 2, wherein the concentration of ammonia water used for SNCR denitration treatment is 5 wt% -10 wt%.
4. The rotary kiln tail gas dedusting and denitration treatment process as claimed in claim 1, wherein a dedusting and denitration integrated catalytic filter bag is arranged in the denitration and dedusting reactor.
5. The rotary kiln tail gas dedusting and denitration treatment process as claimed in claim 4, wherein pulse ash removal is adopted in the denitration and dedusting reactor, and the catalytic filter bag is periodically purged.
6. The rotary kiln tail gas dedusting and denitration treatment process as claimed in claim 4, wherein the catalytic filter bag comprises an inner layer and an outer layer.
7. The rotary kiln tail gas dedusting and denitration treatment process as claimed in claim 6, wherein the outer layer of the catalytic filter bag is an outer layer cloth bag with a PTFE membrane.
8. The rotary kiln tail gas dedusting and denitration treatment process as claimed in claim 6, wherein the inner layer of the catalytic filter bag is a catalytic layer impregnated with honeycomb catalyst.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010877714.6A CN112007509A (en) | 2020-08-27 | 2020-08-27 | Treatment process for dedusting and denitration of tail gas of rotary kiln |
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| CN202010877714.6A CN112007509A (en) | 2020-08-27 | 2020-08-27 | Treatment process for dedusting and denitration of tail gas of rotary kiln |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113578045A (en) * | 2021-08-18 | 2021-11-02 | 中航超能(北京)科技有限公司 | Dust removal and denitration treatment process for cement kiln tail flue gas |
| CN114471104A (en) * | 2022-03-09 | 2022-05-13 | 清源创新实验室 | Flue gas full-working-condition dry desulfurization and catalytic filter bag dust removal-SCR denitration system and method |
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| CN110354772A (en) * | 2019-08-06 | 2019-10-22 | 昆山三一环保科技有限公司 | A kind of flue gas directly draws denitration urea pyrolysis device and method |
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2020
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Patent Citations (8)
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| CN101314105A (en) * | 2008-07-25 | 2008-12-03 | 江苏中科节能环保技术有限公司 | Control technique and apparatus for flue gas NOx of cement kiln |
| CN104056541A (en) * | 2014-02-08 | 2014-09-24 | 上海泰欣环保工程有限公司 | Denitration system combining SNCR with low-temperature SCR and used for household garbage incinerator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113578045A (en) * | 2021-08-18 | 2021-11-02 | 中航超能(北京)科技有限公司 | Dust removal and denitration treatment process for cement kiln tail flue gas |
| CN114471104A (en) * | 2022-03-09 | 2022-05-13 | 清源创新实验室 | Flue gas full-working-condition dry desulfurization and catalytic filter bag dust removal-SCR denitration system and method |
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