CN111151129A - Pellet flue gas denitration treatment device and treatment method thereof - Google Patents
Pellet flue gas denitration treatment device and treatment method thereof Download PDFInfo
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- CN111151129A CN111151129A CN202010108967.7A CN202010108967A CN111151129A CN 111151129 A CN111151129 A CN 111151129A CN 202010108967 A CN202010108967 A CN 202010108967A CN 111151129 A CN111151129 A CN 111151129A
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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
- B01D53/8631—Processes characterised by a specific device
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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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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Abstract
The invention discloses a pellet flue gas denitration treatment device and a treatment method thereof, wherein the pellet flue gas denitration treatment device comprises a rotary kiln, a pellet chain grate, an SCR (selective catalytic reduction) reactor, a denitration fan and a chimney which are sequentially connected; the pipeline between the rotary kiln and the pellet chain grate is connected with the SNCR denitration module, the pipeline between the pellet chain grate and the SCR reactor is provided with an ammonia spraying grid, the ammonia spraying grid is communicated with an ammonia water evaporator, and the ammonia water evaporator is connected with a hot air source. The invention reasonably utilizes the characteristics of the rotary kiln and the pellet chain grate in the pellet process, provides the process combining SNCR and SCR, the treated flue gas selected by SCR is the flue gas at the second preheating section of the pellet chain grate, the whole treatment process cannot be heated and heated, and simultaneously the respective advantages of the two processes are exerted to realize synergistic treatment.
Description
Technical Field
The invention relates to the technical field of flue gas treatment environmental protection equipment, in particular to a pellet flue gas denitration treatment device and a treatment method thereof.
Background
Flue gas pollutants in a pelletizing process are an important pollutant source in metallurgical waste gas, in recent years, China pays particular attention to pollutant treatment in the field of metallurgy, sulfur oxides, nitrogen oxides, particulate matters and the like are generated in the pelletizing production process, the environment of our lives is seriously harmed, and the problems of acid rain, haze and the like are frequent. In order to deal with the environmental impact caused by pellet production, the national environmental protection department promulgates the directive standard of pellet flue gas treatment, wherein the treatment requirement is further strict, and the denitration requirement is also mentioned. The guidelines make explicit requirements for the concentration of emitted pollutants in the pellet smoke, where ultra-low emission limits are imposed for environmentally sensitive areas, i.e. NOx in the smoke < 50mg/m3、SO2＜35mg/m3The particle is less than 10mg/m3. The SNCR technology of independent adoption is administered to present denitration of pelletizing flue gas, but along with new standard proposes, the flue space that rotary kiln and pelletizing grate are connected is narrow and small, does not have sufficient flue gas dwell time, and the denitration reaction is not abundant, does not have higher denitration efficiency, can't realize the emission requirement of minimum. The process of heating the flue gas entering the chimney and then entering the SCR is also provided, the process consumes more fuel for heating, has high energy consumption, and increases the operation cost of the whole treatment.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides the pellet flue gas denitration treatment device and the treatment method thereof, which combine the characteristics of SNCR and SCR, carry out comprehensive treatment cooperatively, can meet the requirement of ultralow emission and reduce energy consumption.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a pellet flue gas denitration treatment device, which comprises a rotary kiln, a pellet chain grate, an SCR (selective catalytic reduction) reactor, a denitration fan and a chimney which are sequentially connected; the pipeline between the rotary kiln and the pellet chain grate is connected with the SNCR denitration module, the pipeline between the pellet chain grate and the SCR reactor is provided with an ammonia spraying grid, the ammonia spraying grid is communicated with an ammonia water evaporator, and the ammonia water evaporator is connected with a hot air source.
Preferably, the SNCR denitration module injects 20% ammonia water into a pipeline between the rotary kiln and the pellet chain grate through evenly-arranged spray guns.
Preferably, the flue gas temperature in the pipeline between the rotary kiln and the pellet chain grate is above 850 ℃.
Preferably, the flue gas temperature in the pipeline between the pellet grate and the SCR reactor is above 300 ℃.
Preferably, the hot air source is a flue gas/air heat exchanger, a flue gas channel of the flue gas/air heat exchanger is communicated with a pipeline between the pellet chain grate and the ammonia injection grid, an air inlet end of an air channel of the flue gas/air heat exchanger is connected with an air conveying fan, and an air outlet end of the air channel of the flue gas/air heat exchanger is communicated with the ammonia water evaporator.
Preferably, a first temperature sensor is arranged on a pipeline between an air outlet end of an air channel of the flue gas/air heat exchanger and the ammonia water evaporator, the first temperature sensor is connected with an industrial personal computer, the industrial personal computer is further connected with a first air preheater, and the first air preheater is communicated with an air inlet end of the air conveying fan through a pipeline.
Preferably, a second temperature sensor is arranged on a pipeline between a flue gas channel of the flue gas/air heat exchanger and the ammonia injection grid, the second temperature sensor is connected with the industrial personal computer, the industrial personal computer is also connected with a second air preheater, the second air preheater is communicated with the flue gas channel of the flue gas/air heat exchanger and the pipeline between the ammonia injection grids through a pipeline, and the power of the second air preheater is greater than that of the first air preheater.
Preferably, when the second air preheater is the pellet grate, the gas outlet end of the pellet grate is communicated with a pipeline between a flue gas channel of the flue gas/air heat exchanger and the ammonia injection grid through a bypass pipeline, and an electromagnetic control valve connected with the industrial personal computer is arranged on the bypass pipeline.
Preferably, the catalyst in the SCR reactor is a honeycomb-shaped, corrugated-shaped or plate-shaped V-Ti catalyst.
The invention also provides a pellet flue gas denitration treatment method using the pellet flue gas denitration treatment device, which comprises the following steps:
conveying pellet flue gas flowing out of the rotary kiln into a pellet chain grate machine through a pipeline, and completing primary denitration work through an existing SNCR denitration module in the flowing process of the pellet flue gas;
the pellet flue gas after primary denitration enters the SCR reactor after passing through the ammonia injection grid, and is mixed with ammonia steam heated by hot air in the flowing process of the pellet flue gas to form mixed gas, and the mixed gas enters the existing SCR reactor to finish secondary denitration.
Compared with the prior art, the invention has the following beneficial effects:
1. the SNCR process is independently used and arranged between the rotary kiln and the pellet grate, the denitration efficiency is 30-50%, the NOx removal of 200-400mg/Nm3 cannot be realized to be below 50mg/Nm3, the heating type SCR of the whole flue gas can realize the denitration efficiency of more than 90%, the energy consumption is high, and the operation cost is high. The device reasonably utilizes the characteristics of the rotary kiln and the pellet chain grate in the pellet process, provides a process combining SNCR and SCR, the treated flue gas selected by the SCR is flue gas at the second preheating section of the pellet chain grate, the whole treatment process cannot be heated and heated, and the synergistic treatment is well realized by exerting the respective advantages of the two processes. The denitration ammonia preparation of the device adopts the diluted air to enter the ammonia water evaporator at 300 ℃ through heat exchange of the flue gas/air heat exchanger, and the ammonia water is evaporated and injected into the ammonia injection grid to provide the reducing agent required by the reaction for SCR, so that high-efficiency innovation is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a process flow diagram of a pellet flue gas denitration treatment device of the invention;
wherein, 1, the rotary kiln; 2. a pellet chain grate; 3. a flue gas/air heat exchanger; 4. an ammonia injection grid; 5, an SCR reactor; 6. a denitration fan; 7. a chimney; 8, an SNCR denitration module; 9. an air delivery fan; 10. an ammonia water evaporator.
Detailed Description
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 given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the defects and shortcomings of the prior art, the invention provides the pellet flue gas denitration treatment device and the treatment method thereof, which combine the characteristics of SNCR and SCR, carry out comprehensive treatment cooperatively, can meet the requirement of ultralow emission and reduce energy consumption.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the invention provides a pellet flue gas denitration treatment device, which comprises a rotary kiln 1, a pellet chain grate 2, an SCR reactor 5, a denitration fan 6 and a chimney 7 which are connected in sequence; the pipeline between the rotary kiln 1 and the pellet chain grate 2 is connected with the SNCR denitration module 8, the pipeline between the pellet chain grate 2 and the SCR reactor 5 is provided with an ammonia injection grid 4, the ammonia injection grid 4 is communicated with an ammonia water evaporator 10, and the ammonia water evaporator 10 is connected with a hot air source.
Among them, the SNCR denitration module 8 is a denitration structure existing in the prior art, and is well known to those skilled in the art for its specific structural configuration, and the pellet grate 2 is also a device commonly used in the art and is not detailed for its specific structure; in the invention, the flue gas treated by the SNCR denitration module 8 is fed into the SCR reactor 5 for denitration reaction again; the process combining SNCR and SCR is provided, the treated flue gas selected by SCR is the flue gas at the second preheating section of the pellet chain grate 2, the whole treatment process cannot be heated and heated, and the respective advantages of the two processes are brought into play simultaneously, so that the synergistic treatment is well realized.
In order to improve the denitration effect of the SNCR denitration module 8, 20% of ammonia water is sprayed into the SNCR denitration module 8 through uniformly arranged spray guns and enters a pipeline between the rotary kiln 1 and the pellet chain grate 2.
In order to ensure that the whole reaction is carried out at an effective temperature, the flue gas temperature in a pipeline between the rotary kiln 1 and the pellet chain grate 2 is more than 850 ℃.
The flue gas temperature in the pipeline between the pellet chain grate 2 and the SCR reactor 5 is above 300 ℃.
In order to fully utilize the temperature of the flue gas, the hot air source is a flue gas/air heat exchanger 3, a flue gas channel of the flue gas/air heat exchanger 3 is communicated with a pipeline between the pellet chain grate 2 and the ammonia injection grid 4, the air inlet end of the air channel of the flue gas/air heat exchanger 3 is connected with an air conveying fan 9, and the air outlet end of the air channel of the flue gas/air heat exchanger 3 is communicated with an ammonia water evaporator 10.
In order to control the temperature of air in a pipeline conveniently, a first temperature sensor is arranged on the pipeline between an air outlet end of an air channel of a flue gas/air heat exchanger and an ammonia water evaporator, the first temperature sensor is connected with an industrial personal computer, the industrial personal computer is also connected with a first air preheater, and the first air preheater is communicated with an air inlet end of an air conveying fan through a pipeline; the first temperature sensor, the industrial personal computer and the first air preheater are all existing devices, are not particularly limited, and only can achieve functions of the first temperature sensor, for example, the first air preheater is heating equipment such as a high-power electric heating wire, the preheating temperature threshold of the first temperature sensor is 300 ℃, when the temperature is lower than 300 ℃, the industrial personal computer controls the first air preheater to be started, when the temperature is higher than 300 ℃ (the error is 10 ℃), the first air preheater is closed, and the control method is a conventional control method in the prior art.
In order to control the flue gas temperature in the main pipeline conveniently, a second temperature sensor is arranged on a pipeline between a flue gas channel of the flue gas/air heat exchanger and the ammonia spraying grid, the second temperature sensor is connected with an industrial personal computer, the industrial personal computer is also connected with a second air preheater, the second air preheater is communicated with the pipeline between the flue gas channel of the flue gas/air heat exchanger and the ammonia spraying grid through the pipeline, and the power of the second air preheater is greater than that of the first air preheater; the second temperature sensor, the industrial personal computer and the second air preheater are all existing devices, are not particularly limited, and only can achieve the functions of the second temperature sensor, for example, the second air preheater is heating equipment such as a high-power electric heating wire, the preheating temperature threshold of the second temperature sensor is 850 ℃, the industrial personal computer controls the second air preheater to be started when the temperature is lower than 850 ℃, and the second air preheater is closed when the temperature is higher than 850 ℃, and the control method is also a conventional control method (the error is 10 ℃) in the prior art.
In order to improve the energy utilization rate, when the second air preheater is a pellet grate, the air outlet end of the pellet grate is communicated with a pipeline between a flue gas channel of a flue gas/air heat exchanger and an ammonia injection grid through a bypass pipeline, and an electromagnetic control valve connected with an industrial personal computer is arranged on the bypass pipeline; the preheating temperature threshold value of the second temperature sensor is 850 ℃, when the temperature is lower than 850 ℃, the industrial personal computer controls the electromagnetic control valve to start, when the temperature is higher than 850 ℃, the electromagnetic control valve is closed, and the control method is also a conventional control method (the error is 10 ℃) in the prior art.
In order to improve the SCR reaction effect, the catalyst in the SCR reactor is a honeycomb-shaped, corrugated-shaped or plate-shaped V-Ti catalyst.
The invention also provides a pellet flue gas denitration treatment method using the pellet flue gas denitration treatment device, which comprises the following steps:
conveying pellet flue gas flowing out of the rotary kiln into a pellet chain grate machine through a pipeline, and completing primary denitration work through an existing SNCR denitration module in the flowing process of the pellet flue gas;
the pellet flue gas after primary denitration enters the SCR reactor after passing through the ammonia injection grid, and is mixed with ammonia steam heated by hot air in the flowing process of the pellet flue gas to form mixed gas, and the mixed gas enters the existing SCR reactor to finish secondary denitration.
According to the above, the more specific implementation process is as follows: the SNCR denitration module 8 shown in FIG. 1 is used for injecting 20% ammonia water through a spray gun, the ammonia water enters the rotary kiln 1 and a flue of the pellet grate 2, the spray gun is uniformly arranged, the temperature of the flue is above 850 ℃, the SNCR reaction can be carried out, and the NOx in the flue gas is removed to 150-mg/Nm 3; the flue gas at the second preheating section of the pellet chain grate 2 is extracted from the rear end of the pellet chain grate to carry out SCR denitration, the temperature of the flue gas at the section is above 300 ℃, medium-high temperature denitration reaction can be carried out, the catalyst is honeycomb-shaped, corrugated-shaped or plate-type V-Ti catalyst, ammonia gas for denitration is realized by evaporating ammonia water after being preheated by air, the preheated air is used for evaporating a heat source and diluting air, the concentration of the ammonia gas is controlled to be below 5%, and the ammonia gas enters the SCR reactor 5 through the ammonia spraying grid 4. After the flue gas is subjected to SCR denitration, the concentration of pollutants is controlled to be below 50mg/Nm3, and the flue gas enters a chimney 7 through a denitration fan 6 and is discharged into the atmosphere.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The utility model provides a pellet flue gas denitration treatment device which characterized in that: comprises a rotary kiln, a pellet chain grate, an SCR reactor, a denitration fan and a chimney which are connected in sequence; the pipeline between the rotary kiln and the pellet chain grate is connected with the SNCR denitration module, the pipeline between the pellet chain grate and the SCR reactor is provided with an ammonia spraying grid, the ammonia spraying grid is communicated with an ammonia water evaporator, and the ammonia water evaporator is connected with a hot air source.
2. The pellet flue gas denitration treatment device of claim 1, characterized in that: and the SNCR denitration module sprays 20% of ammonia water into a pipeline between the rotary kiln and the pellet chain grate through uniformly arranged spray guns.
3. The pellet flue gas denitration treatment device of claim 2, characterized in that: the flue gas temperature in the pipeline between the rotary kiln and the pellet chain grate is above 850 ℃.
4. The pellet flue gas denitration treatment device of claim 1 or 3, characterized in that: the flue gas temperature in the pipeline between the pellet chain grate and the SCR reactor is above 300 ℃.
5. The pellet flue gas denitration treatment device of claim 1, characterized in that: the hot air source is a flue gas/air heat exchanger, a flue gas channel of the flue gas/air heat exchanger is communicated with a pipeline between the pellet chain grate and the ammonia spraying grid, an air inlet end of an air channel of the flue gas/air heat exchanger is connected with an air conveying fan, and an air outlet end of the air channel of the flue gas/air heat exchanger is communicated with the ammonia water evaporator.
6. The pellet flue gas denitration treatment device of claim 5, characterized in that: the ammonia water evaporator is characterized in that a first temperature sensor is arranged on a pipeline between an air outlet end of an air channel of the flue gas/air heat exchanger and the ammonia water evaporator, the first temperature sensor is connected with an industrial personal computer, the industrial personal computer is further connected with a first air preheater, and the first air preheater is communicated with an air inlet end of the air conveying fan through a pipeline.
7. The pellet flue gas denitration treatment device of claim 6, characterized in that: the industrial personal computer is also connected with a second air preheater, the second air preheater is communicated with the flue gas channel of the flue gas/air heat exchanger and the pipeline between the ammonia injection grids through the pipeline, and the power of the second air preheater is greater than that of the first air preheater.
8. The pellet flue gas denitration treatment device of claim 7, characterized in that: when the second air preheater is the pellet chain grate, the air outlet end of the pellet chain grate is communicated with a pipeline between a flue gas channel of the flue gas/air heat exchanger and the ammonia injection grid through a bypass pipeline, and an electromagnetic control valve connected with the industrial personal computer is arranged on the bypass pipeline.
9. The pellet flue gas denitration treatment device of claim 1 or 8, characterized in that: the catalyst in the SCR reactor is a honeycomb-shaped, corrugated-shaped or plate-shaped V-Ti catalyst.
10. A pellet flue gas denitration treatment method using the pellet flue gas denitration treatment device as defined in any one of claims 1 to 9, comprising the steps of:
conveying pellet flue gas flowing out of the rotary kiln into a pellet chain grate machine through a pipeline, and completing primary denitration work through an existing SNCR denitration module in the flowing process of the pellet flue gas;
the pellet flue gas after primary denitration enters the SCR reactor after passing through the ammonia injection grid, and is mixed with ammonia steam heated by hot air in the flowing process of the pellet flue gas to form mixed gas, and the mixed gas enters the existing SCR reactor to finish secondary denitration.
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| CN202010108967.7A CN111151129A (en) | 2020-02-21 | 2020-02-21 | Pellet flue gas denitration treatment device and treatment method thereof |
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| CN202010108967.7A CN111151129A (en) | 2020-02-21 | 2020-02-21 | Pellet flue gas denitration treatment device and treatment method thereof |
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| CN110721568A (en) * | 2019-12-02 | 2020-01-24 | 中国科学院过程工程研究所 | Pellet roasting flue gas denitration and desulfurization device and method based on chain grate-rotary kiln |
| CN212039849U (en) * | 2020-02-21 | 2020-12-01 | 中冶大地工程咨询有限公司 | Pellet flue gas denitration treatment device |
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| US20080089821A1 (en) * | 2005-09-06 | 2008-04-17 | Headwaters Incorporated | Method and System for Reducing Ammonia Slip After Selective Reduction of Nox |
| CN102713483A (en) * | 2009-11-06 | 2012-10-03 | 法孚北美燃烧有限公司 | Apparatus and methods for achieving low NOx in a grate-kiln pelletizing furnace |
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| CN110721568A (en) * | 2019-12-02 | 2020-01-24 | 中国科学院过程工程研究所 | Pellet roasting flue gas denitration and desulfurization device and method based on chain grate-rotary kiln |
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