Slag blocking preventing type wall-attached air device based on air staged combustion

Abstract

The invention relates to a slag blocking preventing type wall-attached air device based on air staged combustion. The slag blocking preventing type wall-attached air device comprises a wall-attached air nozzle consisting of a jet flow air nozzle and a protective air nozzle; the jet flow air nozzle faces the air flow jet direction of a pulverized coal combustor, and the protective air nozzle is arranged back to the air flow jet direction of the pulverized coal combustor; the jet flow air nozzle and the protective air nozzle are separated by a partition plate; and a coke poking device is arranged in the jet flow air nozzle and can push coke slag adhered to the jet flow air nozzle into a hearth. According to the slag blocking preventing type wall-attached air device, air staged combustion isrealized, and NOx generated by combustion is reduced advantageously; protective air forms an air film at the wall-attached position of a water-cooled wall, and the atmosphere at the wall-attached position of the water-cooled wall is improved. Under the action of jet flow air and protective air, the problem of high-temperature corrosion of the boiler water-cooled wall can be solved. Meanwhile, slagbonding or burning loss of the nozzle due to the fact that coke slag particles adhere to the wall-attached air nozzle in the combustion process can be prevented.

Description

technical field [0001] The invention belongs to the field of coal-fired power plant boilers, and in particular relates to an anti-blocking slag type wall-attached wind device based on air staged combustion. Background technique [0002] In order to meet the requirements of environmental protection emissions and reduce the operating pressure of the denitrification system of coal-fired power plant boilers, most domestic pulverized coal boilers adopt low-nitrogen combustion technology (low NOx burners or set compact overfired air COFA and separate overfired air SOFA) to control NOx in combustion. x The equivalent air coefficient in the combustion area (that is, the initial stage of combustion) is less than 1.0, so that the coal combustion process is in an oxygen-deficient combustion state at the beginning, and the oxygen required for combustion is supplemented in the middle and later stages to promote the combustion of pulverized coal and CO gas. burn out. [0003] However, un...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high temperature corrosion of the boiler water wall in the prior art, and provide an anti-slagging type wall-attached air device based on air graded combustion, which can effectively solve the problem of high-temperature corrosion of the boiler water wall and the difficulty of the wall-attached air nozzle. Slag plugging

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