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Method for generating multistage reburning controlling high-capacity coal fired boiler NOX

A coal-fired boiler, large-capacity technology, applied in the direction of combustion method, separation method, solid fuel combustion, etc., can solve the problem of harmful emissions, achieve the effect of protecting social benefits, reducing nitrogen oxide content, and significant social benefits

Inactive Publication Date: 2005-02-23
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0003] The present invention aims to solve the technical problem of generation and discharge of harmful gas nitrogen oxides (NOx) during the combustion of the existing coal-fired boilers in power plants, and provides a boiler for the existing coal-fired power plants as the transformation object, which utilizes reburning fuel and adopts multi-stage A Method for Controlling NOx Formation by Implementing Low Pollution Combustion by Staged Supply

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  • Method for generating multistage reburning controlling high-capacity coal fired boiler NOX

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0013] The multi-stage staged reburning technology is implemented on the main burner of the power plant boiler. Such as figure 1 As shown, along the boiler furnace 1 from bottom to top, it is divided into main combustion zone 5, primary reburning zone 4, secondary reburning zone 3 and burnout zone 2. One method is to inject about 75%-85% pulverized coal fuel into the main combustion zone 5 through the nozzle of the main burner, and the excess air coefficient α>1.0 forms low NO at a low combustion rate with rich oxygen x Combustion; the first-stage reburning nozzle in the lower layer is set above the primary air nozzle on the top of the main burner, and the injection amount of the first-stage reburning fuel is about 10%-15%, forming a slightly rich combustion-reducing atmosphere condition in the first-stage reburning area, The excess air coef...

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Abstract

A method for eliminating NOx generation by large coal boiler in power plant is achieved by arranging multiple stage-and-section re-firing nozzles between the top primary nozzle and final nozzle. Fuels are supplied at some ratio at the stages and sections and blowing volumes are also regulated to form a re-firing area for complete combustion at top of the primary combustor to extend the time for reduction of NOx as pollutant. The re-firing nozzles are arranged beneath the primary combustor in several stages to reduce exhaust of NOx obviously.

Description

technical field [0001] The invention relates to the technical field of large-capacity boiler harmful gas control, in particular to a method for controlling NOx generation of large-capacity coal-fired boilers. Background technique [0002] At present, coal-fired power plants are concentrated areas of energy consumption, and the harmful gas nitrogen oxides (NO x ) is one of the main sources of air pollution today. How to effectively control the generation and emission of nitrogen oxides, and then improve the quality of atmospheric environment, is one of the most important problems to be solved urgently in today's society. Existing control coal combustion process NO x There are two main ways to generate quantity: one is to suppress NO x formation, and the second is to reduce the formed NO x . Fuel multi-stage reburning method is to reduce NO x A very effective method in the method; already controlled NO x There are many methods such as flue gas re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56F23L9/00
Inventor 任建兴李芳芹潘卫国孙坚荣刘燕燕
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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