CN112325648A - Method for reducing harmful gas emission in workshop - Google Patents
Method for reducing harmful gas emission in workshop Download PDFInfo
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- CN112325648A CN112325648A CN202011288718.7A CN202011288718A CN112325648A CN 112325648 A CN112325648 A CN 112325648A CN 202011288718 A CN202011288718 A CN 202011288718A CN 112325648 A CN112325648 A CN 112325648A
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- nitrogen
- flue gas
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- combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
Abstract
The invention discloses a method for reducing harmful gas emission in a workshop, relates to the technical field of heating furnace tail gas treatment, and solves the technical problem that the smoke emission of a heating furnace of the existing gas meter exceeds standard and pollutes the environment. The method for reducing the harmful gas emission of the workshop comprises the steps of S1 controlling the nitrogen content of the fuel, namely adopting the fuel without nitrogen or with low nitrogen content, S2 controlling the generation amount of nitrogen oxide in the combustion process, namely adopting a low excess air coefficient combustion technology or adopting a low nitrogen oxide combustor or a flue gas recirculation combustion technology and S3 to treat the combusted flue gas, namely adopting a wet flue gas denitration technology or adopting a dry flue gas denitration technology or a catalytic decomposition method. The invention can be used for reducing the emission of nitrogen oxides in tail gas of a gas heating furnace. The method for reducing the harmful gas emission of the workshop reduces the nitrogen oxides discharged by the heating furnace by treating the fuel, the combustion process and the combustion tail gas, thereby achieving the aim of protecting the environment.
Description
Technical Field
The invention relates to the technical field of alumina production and manufacturing, in particular to a method for reducing harmful gas emission in a workshop.
Background
Along with the more and more strict requirements of the country on environmental protection, the smoke emission standard of each region on a gas heating furnace is more and more strict, the heating furnace of an extrusion workshop mainly comprises an aluminum bar heating furnace, a section aging furnace, an annealing furnace, a casting furnace, a homogenizing furnace, a drying furnace and the like, at present, the most adopted heating mode is natural gas heating with high cost performance, and the main harmful substance in smoke emitted by the heating furnace adopting natural gas as fuel is nitrogen oxide.
Disclosure of Invention
The invention mainly aims to provide a method for reducing harmful gas emission in a workshop, and solves the technical problem that the smoke emission of a heating furnace of the existing gas meter exceeds standard and pollutes the environment. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for reducing harmful gas emission in a workshop, which comprises the following steps:
s1 controls the nitrogen content of the fuel, namely, the fuel without nitrogen or with little nitrogen content is adopted, S2 controls the generation amount of nitrogen oxide in the combustion process, namely, the combustion technology with low excess air coefficient or the low nitrogen oxide combustor or the flue gas recirculation combustion technology and S3 are used for treating the combusted flue gas, namely, the wet flue gas denitration technology or the dry flue gas denitration technology or the catalytic decomposition method are used.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, the burned flue gas is treated, and the nitrogen oxides are chemically absorbed by water, dilute nitric acid or alkaline solution by using a wet flue gas denitration technology.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, treating the burned flue gas, and reducing nitrogen oxide into nitrogen by using ammonia gas and a catalyst at the temperature of 200-450 ℃ by using a dry flue gas denitration technology, wherein the catalyst of the dry flue gas denitration technology is iron, vanadium or chromium.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, the burned flue gas is treated, and nitrogen oxide is directly decomposed into nitrogen and oxygen by a catalytic decomposition method, wherein the catalyst used by the catalytic decomposition method is gold.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, the burned flue gas is treated, and the nitrogen oxides are chemically absorbed by water, dilute nitric acid or alkaline solution by using a wet flue gas denitration technology.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, treating the burned flue gas, and reducing nitrogen oxide into nitrogen by using ammonia gas and a catalyst at the temperature of 200-450 ℃ by using a dry flue gas denitration technology, wherein the catalyst of the dry flue gas denitration technology is iron, vanadium or chromium.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, the burned flue gas is treated, and nitrogen oxide is directly decomposed into nitrogen and oxygen by a catalytic decomposition method, wherein the catalyst used by the catalytic decomposition method is gold.
Based on the technical scheme, the following technical effects can be generated:
the method for reducing the harmful gas emission of the workshop, provided by the embodiment of the invention, can be used for reducing the emission of nitrogen oxides in tail gas of a gas heating furnace. According to the method for reducing the harmful gas emission in the workshop, the fuel, the combustion process and the combustion tail gas are treated, so that the nitrogen oxide discharged by the heating furnace is reduced, and the technical problem that the smoke emission of the heating furnace of the existing gas meter exceeds the standard and the environment is polluted is solved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a method for reducing harmful gas emission in a workshop, which comprises the following steps:
s1 controls the nitrogen content of the fuel, namely, the fuel without nitrogen or with little nitrogen content is adopted, S2 controls the generation amount of nitrogen oxide in the combustion process, namely, the combustion technology with low excess air coefficient or the low nitrogen oxide combustor or the flue gas recirculation combustion technology and S3 are used for treating the combusted flue gas, namely, the wet flue gas denitration technology or the dry flue gas denitration technology or the catalytic decomposition method are used.
As an alternative embodiment, a method for reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, the burned flue gas is treated, and the nitrogen oxides are chemically absorbed by water, dilute nitric acid or alkaline solution by using a wet flue gas denitration technology. .
As an alternative embodiment, a method for reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, treating the burned flue gas, and reducing nitrogen oxide into nitrogen by using ammonia gas and a catalyst at the temperature of 200-450 ℃ by using a dry flue gas denitration technology, wherein the catalyst of the dry flue gas denitration technology is iron, vanadium or chromium.
As an alternative embodiment, a method for reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, the burned flue gas is treated, and nitrogen oxide is directly decomposed into nitrogen and oxygen by a catalytic decomposition method, wherein the catalyst used by the catalytic decomposition method is gold.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, the burned flue gas is treated, and the nitrogen oxides are chemically absorbed by water, dilute nitric acid or alkaline solution by using a wet flue gas denitration technology.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, treating the burned flue gas, and reducing nitrogen oxide into nitrogen by using ammonia gas and a catalyst at the temperature of 200-450 ℃ by using a dry flue gas denitration technology, wherein the catalyst of the dry flue gas denitration technology is iron, vanadium or chromium.
Alternatively or preferably, a method of reducing harmful gas emissions from a plant, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, the burned flue gas is treated, and nitrogen oxide is directly decomposed into nitrogen and oxygen by a catalytic decomposition method, wherein the catalyst used by the catalytic decomposition method is gold.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. S1, controlling the nitrogen content of the fuel, namely, adopting the fuel with no nitrogen or low nitrogen content, S2 controlling the generation amount of nitrogen oxide in the combustion process, namely, using a low excess air coefficient combustion technology or using a low nitrogen oxide combustor or a flue gas recirculation combustion technology and S3 to treat the combusted flue gas, namely, using a wet flue gas denitration technology or using a dry flue gas denitration technology or a catalytic decomposition method.
2. The method for reducing harmful gas emissions from a plant according to claim 1, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, the burned flue gas is treated, and the nitrogen oxides are chemically absorbed by water, dilute nitric acid or alkaline solution by using a wet flue gas denitration technology.
3. The method for reducing harmful gas emissions from a plant according to claim 1, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, treating the burned flue gas, and reducing nitrogen oxides into nitrogen by using ammonia gas and a catalyst at the temperature of 200-450 ℃ by using a dry flue gas denitration technology.
4. The method for reducing harmful gas emission of a workshop according to claim 3, wherein the method comprises the following steps: the catalyst of the dry flue gas denitration technology is iron, vanadium or chromium.
5. The method for reducing harmful gas emissions from a plant according to claim 1, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the output of nitrogen oxide in the combustion process, using a low excess air coefficient combustion technology and a second nitrogen oxide burner, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, nitrogen in the air is prevented from being oxidized, the low nitrogen oxide burner is used for preventing flue gas from staying in a high-temperature area for a long time, the production of the nitrogen oxide is inhibited, and the flue gas is circulated in the burner by utilizing the injection effect of fuel gas and air, so that the oxygen concentration in the combustion process is reduced, meanwhile, the flue gas absorbs heat, the combustion temperature is reduced, the local high temperature is prevented from being generated, the staying time of the flue gas in the high-temperature area is shortened, and the production of; s3, the burned flue gas is treated, and nitrogen oxides are directly decomposed into nitrogen and oxygen by a catalytic decomposition method.
6. The method for reducing harmful gas emission of a workshop according to claim 5, wherein the method comprises the following steps: the catalyst used in the catalytic decomposition process is gold.
7. The method for reducing harmful gas emissions from a plant according to claim 1, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, the burned flue gas is treated, and the nitrogen oxides are chemically absorbed by water, dilute nitric acid or alkaline solution by using a wet flue gas denitration technology.
8. The method for reducing harmful gas emissions from a plant according to claim 1, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, treating the burned flue gas, and reducing nitrogen oxide into nitrogen by using ammonia gas and a catalyst at the temperature of 200-450 ℃ by using a dry flue gas denitration technology, wherein the catalyst of the dry flue gas denitration technology is iron, vanadium or chromium.
9. The method for reducing harmful gas emissions from a plant according to claim 1, comprising the steps of: s1, controlling the nitrogen content of the fuel, and adopting the fuel without nitrogen or the fuel with low nitrogen content; s2, controlling the yield of nitrogen oxides in the combustion process, and using a low excess air coefficient combustion technology and a flue gas recirculation technology, wherein the low excess air coefficient combustion technology is characterized in that the air coefficient in the combustion process is properly controlled, so that the air entering a heating furnace is reduced, and the nitrogen in the air is prevented from being oxidized; s3, the burned flue gas is treated, and nitrogen oxide is directly decomposed into nitrogen and oxygen by a catalytic decomposition method, wherein the catalyst used by the catalytic decomposition method is gold.
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Application publication date: 20210205 |