CN114353058A - Combustion method for reducing carbon dioxide emission concentration of coal-fired boiler - Google Patents
Combustion method for reducing carbon dioxide emission concentration of coal-fired boiler Download PDFInfo
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- CN114353058A CN114353058A CN202111476967.3A CN202111476967A CN114353058A CN 114353058 A CN114353058 A CN 114353058A CN 202111476967 A CN202111476967 A CN 202111476967A CN 114353058 A CN114353058 A CN 114353058A
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Abstract
The invention relates to the technical field of coal furnace combustion, in particular to a combustion method for reducing the carbon dioxide emission concentration of a coal-fired boiler, which enables top airflow to swirl to form up-down circulation, enables upper flue gas to flow back, enables flue gas carrying a large amount of carbon dioxide to flow back to a high-temperature high-carbon area to form secondary cracking, generates carbon monoxide to intervene combustion, and enables the concentration of the carbon dioxide to be reduced to be more than sixty percent; the method comprises the following steps: s1, injecting main fuel into the main combustion area, and injecting coal powder into the reburning area; s2, introducing primary air for fuel combustion into the main combustion area and the reburning area to combust main fuel, introducing flue gas generated by combustion of the main fuel into the reburning area, and igniting superfine pulverized coal and pilot flue gas; and S3, introducing targeted coherent wind from the upper part of the reburning area, injecting and burning, forming a local vacuum area in the area, enabling the airflow at the top to swirl to form an upper circulation and a lower circulation, and enabling the flue gas carrying a large amount of carbon dioxide to flow back to the main burning area to form secondary cracking and generate carbon monoxide to intervene burning.
Description
Technical Field
The invention relates to the technical field of coal furnace combustion, in particular to a combustion method for reducing the emission concentration of carbon dioxide of a coal-fired boiler.
Background
Carbon dioxide is a greenhouse gas, is nontoxic and tasteless, but has great influence on the living environment of human beings. How to reduce the concentration of the compound has become one of important research topics for human beings.
In the combustion process of the boiler, the traditional combustion mode is blowing, induced air and secondary air for supporting combustion, the traditional combustion mode can not reduce NOx after combustion, can also generate a large amount of carbon dioxide to be discharged into the atmosphere, and can not reach the range of clean combustion far away, so that the greenhouse gas is excessively discharged, and the living environment of human beings is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a combustion method for reducing the carbon dioxide emission concentration of a coal-fired boiler by rotating top airflow to form upper and lower circulation, so that upper flue gas flows back, flue gas carrying a large amount of carbon dioxide flows back to a high-temperature high-carbon area to form secondary cracking, and carbon monoxide is generated to intervene combustion, so that the carbon dioxide concentration is reduced to more than sixty percent.
The invention discloses a combustion method for reducing the emission concentration of carbon dioxide of a coal-fired boiler, which comprises the following steps:
s1, injecting main fuel into the main combustion area, and injecting coal powder into the reburning area;
s2, introducing primary air for fuel combustion into the main combustion area and the reburning area to combust main fuel, introducing flue gas generated by combustion of the main fuel into the reburning area, and igniting superfine pulverized coal and pilot flue gas;
and S3, introducing targeted coherent wind from the upper part of the reburning area, injecting and burning, forming a local vacuum area in the area, enabling the airflow at the top to swirl to form an upper circulation and a lower circulation, and enabling the flue gas carrying a large amount of carbon dioxide to flow back to the main burning area to form secondary cracking and generate carbon monoxide to intervene burning.
The coal powder is superfine coal powder and is used for igniting flue gas generated after primary combustion so as to reduce the generation amount of NOx.
The combustion method for reducing the carbon dioxide emission concentration of the coal-fired boiler controls the air coefficient introduced into the reburning zone to ensure that the excess air coefficient of the reburning zone is less than 1.0, the reburning zone has strong reducing atmosphere in the environment, NOx generated in the main burning zone is reduced, and the reburning zone not only can reduce the generated NOx, but also can inhibit the generation of new NOx.
The combustion method for reducing the carbon dioxide emission concentration of the coal-fired boiler comprises the following steps that the oxygen introducing amount of a main combustion zone accounts for 50% of the total oxygen introducing amount, and the combustion temperature is 900-1000 ℃.
The combustion method for reducing the emission concentration of carbon dioxide of the coal-fired boiler has the carbon dioxide cracking chemical formula of C + CO2=2 CO.
The invention relates to a combustion method for reducing the carbon dioxide emission concentration of a coal-fired boiler.
The invention has the beneficial effects that: the technology of injection up-down circulation utilizes targeted coherent wind to inject combustion in a designated area, a local vacuum area is formed in the area, airflow at the top is convoluted to form up-down circulation, upper flue gas is refluxed, flue gas carrying a large amount of carbon dioxide is refluxed to a high-temperature high-carbon area to form secondary cracking, carbon monoxide is generated to intervene combustion, and the concentration of the carbon dioxide is reduced to more than sixty percent.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
The method comprises the following steps:
s1, injecting main fuel into the main combustion area, and injecting coal powder into the reburning area; s2, introducing primary air for fuel combustion into the main combustion area and the reburning area to combust main fuel, introducing flue gas generated by combustion of the main fuel into the reburning area, and igniting superfine pulverized coal and pilot flue gas; s3, introducing targeted coherent wind from the upper part of the reburning area to inject and burn, forming a local vacuum area in the area, enabling airflow at the top to swirl to form up and down circulation, and enabling flue gas carrying a large amount of carbon dioxide to flow back to the main burning area to form secondary cracking and generate carbon monoxide to intervene burning; the technology of injecting up-down circulation utilizes targeted cluster wind to inject combustion in a designated area, a local vacuum area is formed in the area, airflow at the top is convoluted to form up-down circulation, upper flue gas is refluxed, flue gas carrying a large amount of carbon dioxide is refluxed to a high-temperature high-carbon area to form secondary cracking, carbon monoxide is generated to intervene combustion, and the concentration of the carbon dioxide is reduced to more than sixty percent
Example 2
The coal powder is superfine coal powder and is used for igniting flue gas generated after primary combustion, so that the generation amount of NOx is reduced; under high temperature combustion conditions, NOx exists mainly in the form of NO, NO in the initially discharged NOx accounts for about 95%, but NO is extremely easy to react with oxygen in the air in the atmosphere to generate NO2, so that the NOx in the atmosphere generally exists in the form of NO2, NO in the air and NO2 are mutually converted through photochemical reaction to reach equilibrium, NO2 further reacts with water molecules to form second important acid partial nitric acid (HNO 3) in acid rain in the presence of a high temperature or cloud mist, and the speed of converting N02 into nitric acid is accelerated in the presence of a catalyst such as proper meteorological conditions. Particularly, when NO2 and SO2 exist simultaneously, the nitric acid can be catalyzed mutually, the speed of forming the nitric acid is higher, and therefore the smoke is ignited by adopting the superfine coal powder, the NOx emission is reduced, and the acid rain disaster is prevented.
Example 3
The air coefficient introduced into the reburning zone is controlled to enable the excess air coefficient of the reburning zone to be less than 1.0, a strong reducing atmosphere exists in the environment, NOx generated in the main burning zone is reduced, and the reburning zone not only can reduce the generated NOx, but also can inhibit the generation of new NOx.
Example 4
The oxygen input amount of the main combustion zone accounts for 50% of the total oxygen input amount, and the combustion temperature is 900-1000 ℃.
Example 5
The carbon dioxide cracking chemical formula is C + CO2=2 CO.
Example 6
The reburning zone is arranged above the main burning zone.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A combustion method for reducing the emission concentration of carbon dioxide of a coal-fired boiler is characterized by comprising the following steps:
s1, injecting main fuel into the main combustion area, and injecting coal powder into the reburning area;
s2, introducing primary air for fuel combustion into the main combustion area and the reburning area to combust main fuel, introducing flue gas generated by combustion of the main fuel into the reburning area, and igniting superfine pulverized coal and pilot flue gas;
and S3, introducing targeted coherent wind from the upper part of the reburning area, injecting and burning, forming a local vacuum area in the area, enabling the airflow at the top to swirl to form an upper circulation and a lower circulation, and enabling the flue gas carrying a large amount of carbon dioxide to flow back to the main burning area to form secondary cracking and generate carbon monoxide to intervene burning.
2. The combustion method for reducing the emission concentration of carbon dioxide of a coal-fired boiler according to claim 1, wherein the pulverized coal is ultrafine pulverized coal used for igniting flue gas generated after one combustion to reduce the generation amount of NOx.
3. The combustion method for reducing carbon dioxide emission concentration of a coal-fired boiler according to claim 2, wherein the air ratio introduced into the reburning zone is controlled so that the reburning zone excess air ratio is less than 1.0, and the atmosphere having a strong reducing atmosphere in which NOx generated in the main combustion zone is reduced, and the reburning zone is capable of reducing NOx already generated and suppressing the generation of new NOx.
4. The combustion method for reducing the emission concentration of carbon dioxide of a coal-fired boiler according to claim 3, wherein the oxygen introduction amount of the main combustion zone accounts for 50% of the total oxygen introduction amount, and the combustion temperature is 900 ℃ to 1000 ℃.
5. The combustion method for reducing the emission concentration of carbon dioxide from a coal-fired boiler according to claim 4, wherein the carbon dioxide cracking chemical formula is C + CO2=2 CO.
6. The combustion method for reducing the carbon dioxide emission concentration of a coal-fired boiler according to claim 5, wherein the reburning zone is disposed above the main burning zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111476967.3A CN114353058A (en) | 2021-12-06 | 2021-12-06 | Combustion method for reducing carbon dioxide emission concentration of coal-fired boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111476967.3A CN114353058A (en) | 2021-12-06 | 2021-12-06 | Combustion method for reducing carbon dioxide emission concentration of coal-fired boiler |
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| CN114353058A true CN114353058A (en) | 2022-04-15 |
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| CN202111476967.3A Pending CN114353058A (en) | 2021-12-06 | 2021-12-06 | Combustion method for reducing carbon dioxide emission concentration of coal-fired boiler |
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- 2021-12-06 CN CN202111476967.3A patent/CN114353058A/en active Pending
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