CN110860196A - Desulfurization and denitrification system for cement flue gas - Google Patents
Desulfurization and denitrification system for cement flue gas Download PDFInfo
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- CN110860196A CN110860196A CN201911338183.7A CN201911338183A CN110860196A CN 110860196 A CN110860196 A CN 110860196A CN 201911338183 A CN201911338183 A CN 201911338183A CN 110860196 A CN110860196 A CN 110860196A
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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
- B01D53/75—Multi-step processes
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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
- 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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0233—Other waste gases from cement factories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The application discloses a desulfurization and denitrification system for cement flue gas, which comprises an SNCR (selective non-catalytic reduction) denitrification device for pre-denitrifying the flue gas in a cement kiln, wherein a reducing agent injection device is used for injecting a first denitrification agent into an area with the temperature range of 800-1100 ℃ of the flue gas in the cement kiln; the dry type desulfurization and denitrification integrated reaction equipment is used for deeply denitrifying and desulfurizing the flue gas; the device comprises an absorption tower, wherein sulfur oxides and nitrogen oxides are removed through the reaction of an alkaline absorbent; an absorbent bin for adding an alkaline absorbent into the absorption tower; providing water required by the reaction of the alkaline absorbent and an atomized water spraying device for controlling the temperature of an outlet of the absorption tower; and the second denitration agent prepared by the oxidant preparation device is sprayed into the flue gas through the high-density spraying and mixing device. The application realizes high-efficiency desulfurization and denitrification, and the investment and the operating cost are lower.
Description
Technical Field
The application relates to the technical field of cement flue gas desulfurization and denitration, and more particularly relates to a desulfurization and denitration system for cement flue gas.
Background
Along with the development of social economy and the enhancement of national environmental protection consciousness, the nation starts to vigorously push the transformation of ultralow emission of flue gas in the non-electric field, and the ultralow emission of the flue gas of the cement kiln requires that the emission concentrations of flue gas particles, sulfur dioxide and nitric oxide of the cement kiln are respectively not higher than 10mg/m3、50mg/m3150 (or 100) mg/m3。
At present, a Selective Catalytic Reduction (SCR) method and a selective non-catalytic reduction (SNCR) method are generally adopted in the aspect of denitration in a cement flue gas purification route, and an SCR denitration device has the problems of catalyst poisoning and blockage, high investment cost, high operation and maintenance cost and the like. And the SNCR is used for denitration only, so that the denitration efficiency is low, and the stricter emission standard established by the state cannot be met.
In addition, the traditional wet desulphurization is adopted in the aspect of desulphurization, but the wet desulphurization is serious in corrosion, and the problems that desulphurization waste water needs to be added at the rear end, white waste is eliminated and the like exist.
Therefore, how to more environmentally and effectively desulfurize and denitrate, improve the efficiency of desulfurize and denitrate, and reduce the investment and operation cost is important for solving the problem of NOx pollution of cement flue gas in China.
Content of application
In view of this, the purpose of this application is to disclose a desulfurization and denitrification system of cement flue gas to improve desulfurization and denitrification efficiency, reduce investment and working costs simultaneously.
In order to achieve the above purpose, the present application discloses the following technical solutions:
a desulfurization and denitrification system for cement flue gas comprises:
the SNCR denitration device is used for carrying out pre-denitration on flue gas in the cement kiln, a first denitration agent is sprayed into an area with the temperature range of 800-1100 ℃ of the flue gas in the cement kiln by the SNCR denitration device through a reducing agent spraying device, and the first denitration agent comprises at least one of ammonia water, liquid ammonia, ammonia gas and urea;
the dry type desulfurization and denitrification integrated reaction equipment is used for deeply denitrifying and desulfurizing the flue gas;
wherein: the dry type desulfurization and denitrification integrated reaction equipment comprises:
the absorption tower removes sulfur oxides and nitrogen oxides through the reaction of an alkaline absorbent;
an absorbent bin for adding the alkaline absorbent into the absorption tower, wherein the absorbent bin is connected with the absorption tower through a feeder;
an atomized water spraying device for providing water required by the reaction of the alkaline absorbent and controlling the temperature of the outlet of the absorption tower;
the second denitration agent prepared by the oxidant preparation device is sprayed into the flue gas through the high-density spraying and mixing device, and the second denitration agent comprises at least one of oxidizing gas, oxidizing liquid and oxidizing solid.
Preferably, the above desulfurization and denitrification system further comprises a waste heat boiler for recovering heat from flue gas, wherein the waste heat boiler is arranged between the SNCR denitrification device and the oxidation device.
Preferably, among the above-mentioned SOx/NOx control system, still include the electrostatic precipitator who carries out preliminary dust removal to the flue gas, electrostatic precipitator sets up exhaust-heat boiler with between the oxidation unit.
Preferably, in the above desulfurization and denitrification system, the second denitrifying agent is ozone, chlorine dioxide, chlorine gas, a sodium hypochlorite solution, a sodium chlorite solution, a potassium permanganate solution, hydrogen peroxide, sodium chloride, sodium chlorate or potassium sulfate.
Preferably, in the desulfurization and denitrification system, the alkaline absorbent is quicklime or slaked lime.
Preferably, the system for desulfurization and denitrification further comprises a bag-type dust collector for collecting dust in flue gas, wherein the bag-type dust collector is located at the outlet side of the dry-type desulfurization and denitrification integrated reaction equipment.
Preferably, in the above desulfurization and denitrification system, the recovery treatment inlet of the dry-type desulfurization and denitrification integrated reaction equipment is connected to the recovery treatment outlet of the bag-type dust collector through an air chute.
According to the technical scheme, the cement flue gas desulfurization and denitrification system comprises an SNCR denitrification device for pre-denitrifying flue gas in a cement kiln, wherein the SNCR denitrification device utilizes a reducing agent injection device to inject a first denitrification agent into an area with the temperature range of 800-1100 ℃ of the flue gas in the cement kiln, and the first denitrification agent comprises at least one of ammonia water, liquid ammonia, ammonia gas and urea; the dry type desulfurization and denitrification integrated reaction equipment is used for deeply denitrifying and desulfurizing the flue gas; wherein: dry-type SOx/NOx control integration reaction facility includes: the absorption tower removes sulfur oxides and nitrogen oxides through the reaction of an alkaline absorbent; the absorbent bin is used for adding an alkaline absorbent into the absorption tower and is connected with the absorption tower through a feeder; providing water required by the reaction of the alkaline absorbent and an atomized water spraying device for controlling the temperature of an outlet of the absorption tower; the second denitration agent prepared by the oxidant preparation device is sprayed into the flue gas through the high-density jet mixing device, and the second denitration agent comprises at least one of oxidizing gas, oxidizing liquid and oxidizing solid.
In the application process, this application adopts the SNCR denitration at first through SNCR denitrification facility, utilizes first denitrifier in cement kiln, reduces NOx in the flue gas to harmless N2And H2O, realizing pre-denitration; then the flue gas enters dry desulfurizationThe denitration integrated reaction equipment firstly utilizes a second denitration agent generated by an oxidation device to oxidize NO in flue gas, and then generates water-soluble NO2，N2O5High-valence nitrogen oxides, then entering an absorption tower and SO2The flue gas after the desulfurization and the denitration is discharged to a chimney by a draught fan. .
This application utilizes SNCR denitrification facility and oxidation denitrification facility to realize the two-stage denitration, and the denitration is efficient, has overcome the defect that single-stage denitration is efficient, and investment and working costs are lower, and the SOx/NOx control can be realized simultaneously in the secondary denitration process to reach high-efficient SOx/NOx control.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic process flow diagram of a cement flue gas desulfurization and denitrification system disclosed in an embodiment of the application.
Detailed Description
The embodiment of the application discloses desulfurization and denitrification system of cement flue gas, has realized high-efficient desulfurization and denitrification, has overcome the defect that single-stage denitration is inefficient, and investment and working costs are lower.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to the attached drawing 1, the desulfurization and denitrification system for cement flue gas disclosed in the embodiment of the application comprises an SNCR denitrification device 2 for pre-denitrifying flue gas in a cement kiln 1, wherein the SNCR denitrification device 2 utilizes a reducing agent injection device to inject a first denitrification agent into an area with a flue gas temperature range of 800-1100 ℃ in the cement kiln 1, and the first denitrification agent comprises at least one of ammonia water, liquid ammonia, ammonia gas and urea; the dry type desulfurization and denitrification integrated reaction equipment is used for deeply denitrifying and desulfurizing the flue gas; wherein: the dry desulfurization and denitrification integrated reaction equipment comprises an absorption tower 11, wherein sulfur oxides and nitrogen oxides are removed through the reaction of an alkaline absorbent; an absorbent bin 9 for adding an alkaline absorbent into the absorption tower 11, wherein the absorbent bin 9 is connected with the absorption tower 11 through a feeder; an atomized water spraying device 10 for providing water required by the reaction of the alkaline absorbent and controlling the temperature of the outlet of the absorption tower 11; and the oxidation device 8 is arranged on an inlet flue of the absorption tower 11, the oxidation device 8 comprises an oxidant preparation device 6 and a high-density jet mixing device 7, a second denitration agent prepared by the oxidant preparation device 6 is sprayed into the flue gas through the high-density jet mixing device 7, and the second denitration agent comprises at least one of oxidizing gas, oxidizing liquid and oxidizing solid.
In the application process, the SNCR denitration method is adopted by the SNCR denitration device 2, the first denitration agent is utilized in the cement kiln 1, and the NOx in the flue gas is reduced into harmless N2And H2O, realizing pre-denitration; then the flue gas enters a dry type desulfurization and denitrification integrated reaction device, NO in the flue gas is oxidized by a second denitrifying agent generated by an oxidizing device 8 to generate water-soluble NO2，N2O5High-valence nitrogen oxides, and then entering an absorption tower 11 and SO2And the flue gas after deep denitration and desulfurization is discharged to a chimney 16 by a draught fan 13.
The alkaline absorbent in the absorbent bin 9 can be added into the dry desulfurization and denitrification integrated reaction equipment through the feeder as required to supplement fresh alkaline absorbent, and meanwhile, the atomized water injection device 10 is adjusted as required, so that the outlet temperature of the reaction equipment is controlled to be 80-110 ℃, and high-temperature flue gas damage to rear-end treatment equipment is avoided while efficient desulfurization and denitrification is ensured.
This application utilizes SNCR denitrification facility 2 and oxidation unit 8 to realize the two-stage denitration, and the denitration is efficient, has overcome the defect that single-stage denitration is efficient, and investment and working costs are lower, and SOx/NOx control can be realized simultaneously in the secondary denitration process to reach high-efficient SOx/NOx control.
In addition, SO is arranged in the dry type desulfurization and denitrification integrated reaction equipment2、SO3、NO2And the acid gas reacts with the added alkaline absorbent to be removed. The gas phase and the solid phase in the dry type desulfurization and denitrification integrated reaction equipment are violently turbulent and mixed due to the action of the gas flow, and are fully contacted, so that the mass transfer and the heat transfer between the gas phase and the solid phase are greatly enhanced, and the full absorption and removal of the acidic substances are ensured.
Moreover, this application adopts dry-type SOx/NOx control integration reaction equipment, and the operation process does not have waste water and produces. In addition, not only can no aerosol be generated, but also the original aerosol in the smoke can be effectively removed. The temperature of the smoke is controlled to be 10-15 ℃ above the dew point temperature, so that white smoke is avoided. The corrosion of the equipment is less, and the chimney 16 does not need to be anticorrosive.
The desulfurization and denitrification system further comprises a waste heat boiler 4 for recovering heat of the flue gas, wherein the waste heat boiler 4 is arranged between the SNCR denitrification device 2 and the oxidation device 8. The flue gas after primary denitration carries out heat recovery through exhaust-heat boiler 4, has reduced the flue gas temperature simultaneously, has reduced the temperature requirement of follow-up treatment facility, reduce cost.
The desulfurization and denitrification system further comprises an electric dust remover 5 for primarily removing dust from the flue gas, wherein the electric dust remover 5 is arranged between the waste heat boiler 4 and the oxidation device 8. This application is carried out preliminary dust collection to the flue gas through electrostatic precipitator 5, alleviates the wearing and tearing to follow-up plant equipment. This electric precipitator 5 may not be provided.
The second denitrifier is ozone, chlorine dioxide, chlorine, a sodium hypochlorite solution, a sodium chlorite solution, a potassium permanganate solution, hydrogen peroxide, sodium chloride, sodium chlorate or potassium sulfate. In the specific embodiment, the second denitrifier is ozone, the oxidation device 8 is arranged before the desulfurization device, and the ozone oxidant is sprayed by high densityThe mixing device 7 is sprayed into the flue gas, the ozone has strong oxidizing property, and NO in the flue gas can be oxidized into NO which is easily dissolved in water2，N2O5The high-valence nitrogen oxides are obtained, and the deep denitration efficiency is controlled to be about 70%.
This application adopts ozone as second denitrifier, and ozone can be discharged into the atmosphere again after fully reacting and decomposing in reaction equipment, safe and reliable. Of course, the second denitration agent may be another oxidizing agent.
Specifically, the alkaline absorbent is quicklime or slaked lime, and absorbs sulfur oxides and nitrogen oxides through a calcium base, so that the cost is low, and of course, other substances capable of absorbing the sulfur oxides and the nitrogen oxides can be adopted.
The desulfurization and denitrification system also comprises a bag-type dust collector 12 for collecting dust in the flue gas, and the bag-type dust collector 12 is positioned at the outlet side of the dry-type desulfurization and denitrification integrated reaction equipment. The outlet of the dry type desulfurization and denitrification integrated reaction equipment is directly connected with a bag-type dust collector 12, and the bag-type dust collector 12 collects smoke dust and unreacted materials.
This application is through two-stage denitration, dry-type desulfurization and dust removal, NOx, SO2And dust can be stably discharged at 100mg/Nm3、50mg/Nm3、5mg/Nm3The following ultra low emission standards. The combined desulfurization and denitrification process has the advantages of high desulfurization, denitrification and dust removal efficiency, low investment and operation cost and simple system.
The system is stable and can meet the ultra-clean requirement.
Preferably, the recovery treatment inlet of the dry desulfurization and denitrification integrated reaction equipment is connected with the recovery treatment outlet of the bag-type dust collector 12 through an air chute 14. Most of the materials output by the dry type desulfurization and denitrification integrated reaction equipment are returned to the reaction equipment through the air chute 14 for recycling and continuously participate in the reaction, and a small amount of byproducts are discharged outside through the bin pump 15. The clean flue gas after desulfurization, denitrification and dust removal enters a chimney 16 through a desulfurization and denitrification draught fan 13.
The desulfurization and denitrification system provided by the embodiment of the invention comprises the following main process flows:
the flue gas passes through the kiln tail of the cement rotary kilnThe temperature range of the decomposing furnace 3 is set in the 800-1100 ℃ region to be provided with the SNCR denitration device 2 for pre-denitration, the first denitration agent is sprayed into the decomposing furnace 3 through the SNCR denitration device 2, and NOx is converted into N by utilizing high-temperature conditions and reducing agents2、H2Harmless substances such as O and the like; the flue gas after pre-denitration enters a waste heat boiler 4 to recover heat in the flue gas, then is subjected to pre-dust removal in an electric dust remover 5, then enters dry type desulfurization and denitration integrated reaction equipment provided with an oxidation device 8 to perform desulfurization and deep denitration, an oxidant generated by an oxidant preparation device 6 is sprayed into a flue through a high-density spraying and mixing device 7 to react, NO is converted into NO2、N2O5Nitrogen oxides of high valence state; SO in flue gas in the absorption tower 112、SO3、HCl、NO2And the pollutants and the sprayed calcium-based absorbent are quickly removed through reaction. The flue gas after desulfurization and denitrification is subjected to deep dust removal by the bag-type dust remover 12, and the hot flue gas after desulfurization, denitrification and dedusting is discharged into the chimney 16 through the induced draft fan 13.
Example one
As shown in fig. 1, the desulfurization and denitrification system for cement flue gas comprises a cement kiln 1 connected in sequence; an SNCR denitration device 2; a decomposing furnace 3; a waste heat boiler 4; an electric dust collector 5; an oxidant preparation device 6; a high-density jet mixing device 7; an oxidation device 8; an absorbent bin 9; an atomized water spray device 10; an absorption tower 11; a bag-type dust collector 12; and an induced draft fan 13.
The SNCR denitration device 2 is arranged in the temperature range of 800-1100 ℃ of the decomposing furnace 3, the reducing agent is sprayed into the decomposing furnace 3 through the SNCR denitration device 2 for pre-denitration, and NOx is converted into N under the high-temperature condition2And H2Harmless substances such as O and the like; the heat in the flue gas is recovered by the flue gas after pre-denitration through a waste heat boiler 3; then pre-dedusting is carried out by an electric precipitator 5; the oxidation device 8 is arranged between the dry type desulfurization and denitrification integrated reaction equipment and the electric dust collector 5. The oxidation device 8 uses ozone as oxidant, the oxidant generated by the oxidant preparation device 6 is sprayed into the flue gas through the high-density spraying and mixing device 7 to convert NO into NO2、N2O5Nitrogen oxides of high valence state; in the absorption tower 11, SO in the flue gas2、SO3、NO2The pollutants and the sprayed calcium-based absorbent are quickly removed through reaction; the atomized water spraying device 10 is a water spraying gun to perform water spraying reaction temperature control, so that the temperature of the flue gas passing through the dry type desulfurization and denitrification integrated reaction equipment is stabilized at 80-100 ℃; finally, the flue gas after desulfurization and denitrification is deeply dedusted by the bag-type deduster 12 and enters the chimney 16 through the induced draft fan 13 to be discharged to the atmosphere.
Example two
The desulfurization and denitrification system is used in 4500t/d cement kiln, and the flue gas volume is 340000Nm3The standard condition is/h; the concentration of NOx in the flue gas is about 800mg/Nm3，SO2Is 1000mg/Nm3. Using Ca (OH)2Used as an absorbent and ozone is used as a denitration oxidant.
The invention is adopted to process the flue gas. The flue gas needing to be purified is firstly denitrated in advance in a cement kiln by using an SNCR denitration device 2, and the concentration of NOx at an SNCR outlet can be stabilized at 200-300 mg/Nm3Then the oxidation device 8 takes the high-concentration ozone generated by the oxidant preparation device 6 as an oxidant and sprays the ozone into the flue gas to convert NO into NO2、N2O5Nitrogen oxides of high valence state; in the absorption tower 11, SO in the flue gas2、SO3、NO2The pollutants and the sprayed calcium-based absorbent are quickly removed through reaction; then the dust is removed by an electric dust remover 5, and finally the dust is discharged into a chimney 16 through a draught fan 13.
The flue gas purification device realizes standard discharge, the desulfurization efficiency can reach more than 99 percent, the combined denitration efficiency can reach more than 85 percent, and the discharge concentration is respectively lower than 50mg/Nm3、100mg/Nm3(ii) a Dust concentration is less than 5mg/Nm3。
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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 (7)
1. The utility model provides a desulfurization denitration system of cement flue gas which characterized in that includes:
the SNCR denitration device (2) is used for carrying out pre-denitration on flue gas in the cement kiln (1), the SNCR denitration device (2) utilizes a reducing agent injection device to inject a first denitration agent into a region with the flue gas temperature range of 800-1100 ℃ in the cement kiln (1), and the first denitration agent comprises at least one of ammonia water, liquid ammonia, ammonia gas and urea;
the dry type desulfurization and denitrification integrated reaction equipment is used for deeply denitrifying and desulfurizing the flue gas;
wherein: the dry type desulfurization and denitrification integrated reaction equipment comprises:
the absorption tower (11) removes sulfur oxides and nitrogen oxides through the reaction of an alkaline absorbent;
an absorbent bin (9) for adding the alkaline absorbent into the absorption tower (11), wherein the absorbent bin (9) is connected with the absorption tower (11) through a feeder;
an atomized water spraying device (10) for providing water required by the reaction of the alkaline absorbent and controlling the temperature of the outlet of the absorption tower (11);
the second denitration agent is characterized by comprising an oxidation device (8) arranged on an inlet flue of the absorption tower (11), wherein the oxidation device (8) comprises an oxidant preparation device (6) and a high-density jet mixing device (7), the second denitration agent prepared by the oxidant preparation device (6) is jetted into flue gas through the high-density jet mixing device (7), and the second denitration agent comprises at least one of oxidizing gas, oxidizing liquid and oxidizing solid.
2. The desulfurization and denitrification system according to claim 1, further comprising a waste heat boiler (4) for recovering heat from flue gas, wherein said waste heat boiler (4) is disposed between said SNCR denitrification apparatus (2) and said oxidation apparatus (8).
3. The desulfurization and denitrification system according to claim 2, further comprising an electric dust collector (5) for preliminarily removing dust from the flue gas, wherein the electric dust collector (5) is arranged between the exhaust-heat boiler (4) and the oxidation device (8).
4. The desulfurization and denitrification system according to claim 1, wherein the second denitrification agent is ozone, chlorine dioxide, chlorine gas, a sodium hypochlorite solution, a sodium chlorite solution, a potassium permanganate solution, hydrogen peroxide, sodium chloride, sodium chlorate or potassium sulfate.
5. The SOx/NOx control system of claim 1, wherein the alkaline absorbent is quicklime or slaked lime.
6. The desulfurization and denitrification system according to claim 1, further comprising a bag-type dust collector (12) for collecting dust in flue gas, wherein the bag-type dust collector (12) is located at the outlet side of the dry desulfurization and denitrification integrated reaction equipment.
7. The desulfurization and denitrification system according to claim 6, wherein the recovery treatment inlet of the dry desulfurization and denitrification integrated reaction device is connected with the recovery treatment outlet of the bag-type dust collector (12) through an air chute (14).
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| CN113332839A (en) * | 2021-04-25 | 2021-09-03 | 北京建筑材料科学研究总院有限公司 | Cement kiln flue gas desulfurization and denitrification coupling recycling system and method |
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