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Method for burning of low nitrogen oxides in coal-burning boiler

A low-nitrogen oxide, coal-fired boiler technology, which is applied in the combustion of solid fuels, combustion equipment, lighting and heating equipment, etc. Slagging and other problems are prone to occur in the reburning zone and the reburning zone.

Inactive Publication Date: 2007-08-15
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention aims to solve the problems that the reburning area is not easy to form a stable reducing atmosphere, the reduction rate of nitrogen oxides is low, and the main combustion area and the reburning area are prone to slagging and high-temperature corrosion.

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  • Method for burning of low nitrogen oxides in coal-burning boiler

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specific Embodiment approach 1

[0005] Specific embodiment one: in this embodiment, a method for low nitrogen oxide combustion in a coal-fired boiler is realized through the following steps: (1) sending conventional particle size pulverized coal, which accounts for 80% to 85% of the calorific value of the boiler fuel, into the The main combustion zone at the lower part of the boiler furnace is burned with the horizontal thick-lean air combustion technology under the condition that the excess air coefficient is 0.8-1.05; The pulverized coal, which accounts for 15% to 20% of the calorific value of the boiler fuel, is injected as reburning fuel from above the main combustion zone to form a reburning zone. The excess air coefficient at the outlet of the reburning zone is controlled at 0.85 to 0.95, and the residence time of flue gas in the reburning zone is 0.2 Seconds to 0.8 seconds, the reburning fuel is burned with horizontal rich-lean combustion technology or direct-flow combustion; (3) Inject the overburning...

specific Embodiment approach 2

[0006] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step (1), the conventional particle size pulverized coal that accounts for 82% to 84% of the boiler fuel calorific value is put into the main combustion zone of the boiler furnace bottom. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0007] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step (1), the conventional particle size pulverized coal that accounts for 83% of the boiler fuel calorific value is put into the main combustion zone of the boiler furnace bottom. Other steps are the same as in the first embodiment.

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Abstract

A method used to burn low-nitrogen oxide in coal boiler, which can form stable reduction gas, comprises that 1, burning general coal in main burning area via horizontal wind technique, 2, using fine coal powder as burning fuel to burn via dense-dilute burning technique to form a reburning area with reduction gas and the smoke in the nitrogen oxide of main burning area is reduced when passes reburning area, 3, injecting burnt air above the reburning area to form a burnt area, while the not burnt product is burnt in the burnt area. The invention can reduce 50-65% of nitrogen oxide discharge, to reduce high temperature corrosion and slag.

Description

technical field [0001] The invention relates to a method for combustion with low nitrogen oxides. Background technique [0002] Nitrogen oxides produced by pulverized coal combustion are one of the main sources of air pollution. In addition to forming acid rain and destroying the ecological environment, they can also form photochemical smog, which is harmful to human health. The pulverized coal reburning low-NOx combustion technology is a measure to reduce nitrogen oxides with high denitrification efficiency, low investment, and low operating costs. The key to the pulverized coal reburning low-NOx combustion technology is to form a reburning zone with a reducing atmosphere. However, the coal quality of thermal coal in my country is generally poor. With pulverized coal as the reburning fuel, it is difficult to form a stable reducing atmosphere in the reburning zone, and the nitrogen oxide reduction rate is low; the burnout of reburning pulverized coal is also poor; technology,...

Claims

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Application Information

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IPC IPC(8): F23B70/00
Inventor 吴少华刘辉孙绍增邱朋华孙锐秦明李争起秦裕琨
Owner HARBIN INST OF TECH
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