Boiler apparatus for preventing high temperature corrosion of water screen and method therefor

Abstract

The invention relates to a boiler apparatus for preventing high temperature corrosion of a water screen, which comprises a body of heater, a low nitrogen eddy flow combustor and a high nitrogen eddy flow combustor. And the body of heater comprises a front wall, a back wall, a left side wall and a right side wall; the high nitrogen eddy flow combustor is installed on the areas of the front wall and the back wall near the left side wall and the right side wall, and the low nitrogen eddy flow combustor is installed on the central section area of the front wall and the back wall far from the left side wall and the right side wall. The invention replaces the combustors close to the left side wall and the right side wall into a high nitrogen eddy flow combustor by reasonable arrangement of two kinds of eddy flow combustors, thereby solving the problem of high temperature corrosion of the side wall water screen with simple operation and convenient operation management and without negative influences to the stability of the combustion in furnace and increased boiler operation maintenance cost.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a boiler device and method for preventing high-temperature corrosion of a water wall. Background technique [0002] With the state on NO x With the continuous improvement of emission requirements, low-nitrogen swirl burners and air staging technologies have been widely used in boilers. Although low-nitrogen swirl burners and air staging technologies can effectively suppress and reduce NO x Generated, but the problem of high-temperature corrosion of the water wall of the boiler followed. The main reasons are: 1. The low-nitrogen burner and air-staged supercritical boiler are applied, and the main combustion zone is anoxic-combusted to form a reducing atmosphere, which is beneficial to the corrosive gas H 2 The formation of S is also conducive to the formation of Cl corrosion; 2. Low nitrogen swirl burners usually use delayed mixing of primary air and secondary air to achieve low...

AI Technical Summary

Problems solved by technology

High-temperature corrosion causes the thickness of water-cooled wall tubes to decrease year by year, and the metal loss rate of boiler water-cooled wall tubes is even as high as 2.5mm / year, which poses a serious threat to the safe and stable operation of boilers

[0003] At present, the commonly used methods to reduce or prevent high-temperature corrosion of boiler water-cooled walls are: 1. Perform surface anti-corrosion treatment such as aluminizing on the water-cooled wall tubes, but this method is expensive and the protection period is short; 2. Install on the side wall Adhering to the wall, but the investment of the wall-attached air system is relatively large, the structure is complex, and the wall-attached air requires a large wind speed, which is easy to affect the stability of combustion in the furnace

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