Method for reducing nitrogen oxide of powder coal boiler mixed burning gas fuel

A gas fuel and pulverized coal boiler technology, applied in the direction of combustion, burner, lighting and heating equipment using gaseous fuel and powder fuel, can solve the problems of excessive consumption of reburning fuel, affecting the formation of reducing atmosphere in the reburning zone, etc., to achieve Conducive to ignition and burnout, moderate initial investment and operating costs, and improved efficiency

Inactive Publication Date: 2007-10-10
HARBIN INST OF TECH
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Problems solved by technology

[0004] In order to solve the problem that excess oxygen in the main combustion zone enters the reburning zone in the existing gas reburning technology, resulting in excessive consumption of reburning fuel in the reburning zone and affecting the formation of a reducing atmosphere in the reburning zone, the present invention provides a pulverized coal boiler mixed combustion The method for reducing nitrogen oxides by gaseous fuel, the specific steps are:

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  • Method for reducing nitrogen oxide of powder coal boiler mixed burning gas fuel

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specific Embodiment approach 1

[0017] Specific implementation mode 1: The steps of the method for reducing nitrogen oxides by co-combusting gaseous fuel in pulverized coal boilers in this embodiment are as follows:

[0018] Step 1: Introduce primary gas fuel at the bottom of the main burner in the main combustion zone as a combustion-supporting fuel; increase the flue gas temperature in the main combustion zone to make the pulverized coal in the main combustion zone burn stably;

[0019] Step 2: Introduce secondary gas fuel at the top of the main combustion zone, form a reducing atmosphere in the reburning zone, and make the NO generated in the main combustion zone X When passing through the reburning zone, it is reduced by CHi, NHi, HCN, CO and other groups formed by the combustion of reburning fuel;

[0020] Step 3: Introduce the burnout air at the top of the reburning zone, so that the unburned products in the reburning zone are fully burned in the burnout zone above the reburning zone.

[0021] In this...

specific Embodiment approach 2

[0026] Specific embodiment two: In the method for reducing nitrogen oxides by co-combusting gas fuel in pulverized coal boilers in this embodiment, biomass gas is used as co-combusting gas, and biomass gas accounting for 10% of the boiler heat is introduced into the furnace at the lower part of the pulverized coal burner , the main combustion area adopts the horizontal thick-lean air combustion technology, the excess air coefficient in the main combustion area is controlled to 1.05, and the biomass gas, which accounts for 12% of the boiler heat, is introduced into the furnace at the upper part of the pulverized coal burner, and forms a reburning area with a reducing atmosphere. The excess air coefficient is 0.85, and groups such as CHi and NHi in the reburning zone reduce the NO generated in the main combustion zone X , the excess air coefficient in the burnout zone is 1.2.

specific Embodiment approach 3

[0027] Specific implementation mode three: In the method for reducing nitrogen oxides by co-combusting gas fuels in pulverized coal boilers in this embodiment, natural gas is used as co-combusting gas, and natural gas accounting for 10% of the boiler heat is introduced into the furnace at the lower part of the pulverized coal burner, and the main combustion zone The horizontal thick-lean air combustion technology is adopted, the excess air coefficient in the main combustion zone is controlled to 0.9, and the natural gas accounting for 10% of the boiler heat is introduced into the furnace at the upper part of the pulverized coal burner to form a reburning zone with a reducing atmosphere. The excess air coefficient in the reburning zone is 0.85, In the reburning zone CHi, HCN, NHi and other groups reduce the NO generated in the main combustion zone X , the excess air coefficient in the burnout zone is 1.2. The calorific value of natural gas is good, it is a good reburning fuel a...

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Abstract

A method for decreasing nitrogen oxide of mixed gas fuel used on pulverized-coal boiler includes dividing gas fuel to be two grades then leading them into pulverized-coal furnace tank, leading in primary gas fuel as combustion-assistant fuel at bottom of master burner at master combustion region to burn it by utilizing gradation air-combustion technique with low air overdose parameter, leading in secondary gas fuel at top of master combustion region to form reducing atmosphere of re-combustion region and leading in burn out air at top of re-combustion region.

Description

Technical field: [0001] The invention relates to a low-nitrogen oxide combustion technology for pulverized coal boilers. Background technique: [0002] Nitrogen oxides (NO X ) is one of the main air pollutants emitted by coal-fired boilers. In addition to forming acid rain and destroying the ecological environment, nitrogen oxides can also form photochemical smog, which directly endangers human health. At present, nitrogen oxides have become an air pollutant second only to sulfur dioxide in my country, and their impact on acid rain, air quality and ground ozone concentration is increasing. On January 1, 2004, the new "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2003) was implemented, and the "Emission Standards" are more stringent than the previous standards. Since July 1, 2004, the state has charged 0.6 yuan for each pollution equivalent of nitrogen oxides (the equivalent of nitrogen oxides is 0.95 kg) to the units that discharge pollutants, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C1/12F23D17/00
Inventor 刘辉吴少华赵广播邱朋华孙绍增秦明孙锐秦裕琨
Owner HARBIN INST OF TECH
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