Side wall water-cooling wall adherence protecting device based on horizontal shade separation

Abstract

The invention relates to a side wall water-cooling wall adherence protecting device based on horizontal shade separation. The device comprises wall-adhering air nozzles arranged on two sides of a front wall and a back wall of a fired coal power station boiler respectively, wherein burners are arranged between the wall-adhering air nozzles on two sides of the front and back walls. Each burner comprises an outermost burner adjacent to the wall-adhering air nozzles and other several middle regional burners; a window-shades type pulverized coal concentrator is arranged in a primary air pipe of the outermost burner, the primary air pipe of the outermost burner is divided into a concentrated pulverized coal nozzle and a light pulverized coal nozzle, the concentrated pulverized coal nozzle is arranged on the side, close to the middle regional burner, along the width direction of the boiler, the light pulverized coal nozzle is arranged on the side, close to the left or right side wall of the boiler, a pulverized coal pipeline of the outermost burner is introduced from a horizontal height direction of the primary air pipe and is connected to the primary air pipe through a bend; and air distribution adjustment can be carried out on the concentrated pulverized coal nozzle and the light pulverized coal nozzle through air valve baffle plates arranged independently. The device can improve a wall adherence atmosphere of the side wall water-cooling wall obviously.

Description

technical field [0001] The invention belongs to the field of coal-fired power station boilers, and relates to a side wall water-cooled wall sticking protection device based on horizontal concentration and light separation. Background technique [0002] The burners of the front and rear wall opposed combustion boilers are arranged on the front wall and the rear wall of the boiler, and the middle area of ​​the left wall and the right wall is prone to high temperature corrosion. device elevation position. For example, a 350MW supercritical unit with a height between the B and C layer burners has high-temperature corrosion problems on the left / right wall spiral pipe ring water wall, and the lowest side thickness of the most severely thinned water wall is about 1.2mm. It is less than 1 / 5 of the original wall thickness; there is a high-temperature corrosion problem in the elevation range from the lower burner to the upper burner on the two side walls of a 660MW supercritical unit...

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Problems solved by technology

[0004] However, there are still many problems in the implementation of the existing technology, mainly including: the anti-corrosion spraying protection of the water wall is greatly affected by the spraying process and spraying materials, and spraying needs to be re-applied every 2 to 3 years; subject to changes in the coal market With the operating pressure of coal-fired power stations, the proportion of high-sulfur coal mixed with coal is relatively large; in order to meet the output of the coal mill and the load capacity of the unit, the fineness of coal powder cannot be controlled to be too fine; the opening of the secondary air outside the outermost burner is the largest, and the rotation The weakening of flow intensity results in a decline in the ability to entrain high-temperature flue gas, which is not conducive to the ignition and stable combustion of coal powder; the additional wall-mounted air nozzle is prone to slagging and burning, and loses the effect of wall-mounted air

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