Closing-to-wall air system for preventing high temperature corrosion of water wall of four-corner tangential firing boiler, and working method thereof

Abstract

The invention relates to a closing-to-wall air system for preventing high temperature corrosion of a water wall of a four-corner tangential firing boiler, and a working method thereof. The closing-to-wall air system comprises a front wall burner area closing-to-wall air device, a rear wall burner area closing-to-wall air device, a left wall burner area closing-to-wall air device and a right wall burner area closing-to-wall air device; the front wall burner area closing-to-wall air device, the rear wall burner area closing-to-wall air device, the left wall burner area closing-to-wall air deviceand the right wall burner area closing-to-wall air device are located on a front wall water wall, a rear wall water wall, a left wall water wall and a right wall water wall separately; and the rightwall burner area closing-to-wall air device comprises a curved baffle, a closing-to-wall air box, a regulation actuator, a tapered plug, a regulating connecting rod, an air duct, a regulation air door, a main pipe, an A wall surface condition monitor and a B wall surface condition monitor. The closing-to-wall air system has the characteristics of wide cover area, capability of fine regulation, slow wind speed attenuation, good cooling effect of nozzles and the like.

Description

technical field [0001] The invention relates to a wall-attached wind system and method, in particular to a wall-attached air system and a working method for preventing high-temperature corrosion of the water wall of a four-corner tangential combustion boiler. Background technique [0002] The quality of coal used in power station boilers in my country is relatively complex, and there is often a certain deviation from the characteristics of the designed fuel. Frequent changes in coal quality and unreasonable coal blending and combustion often lead to problems such as slagging, contamination, and high-temperature corrosion. Among them, high-temperature corrosion The problem has the greatest impact on the reliability of the boiler operation; with the increase of the capacity and parameters of the coal-fired boiler, the problem of the water wall of the boiler also increases correspondingly, which also leads to the occurrence of high temperature corrosion; in addition, in order to ...

AI Technical Summary

Problems solved by technology

[0004] 1) The wall-attached wind is incompletely covered on the water-cooled wall, and the effect of preventing high-temperature corrosion in the uncovered area is poor;

[0005] 2) The wall-attached air volume cannot be finely adjusted according to the reducing atmosphere distribution on the surface of the water wall;

[0006] 3) The wind direction of the wall-attached wind is perpendicular to the axial direction of the water-cooled wall, and the wind speed attenuation is relatively fast, and the effect is halved;

[0007] 4) The cooling condition of the wall-attached air nozzle is relatively poor, and the nozzle is prone to burn out

[0008] In summary, wall-attached wind can be used as an effective method to solve high-temperature corrosion of water-cooled walls, but in practical applications, the effect is poor due to improper methods. , The wall-attached air system and method with good cooling effect of the nozzle can better solve the problem of high temperature corrosion of the water wall

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