A high-temperature anti-corrosion device for coal-fired boilers with self-cooling function

Abstract

The invention discloses a coal-fired boiler high-temperature anti-corrosion device with a self-cooling function. The coal-fired boiler high-temperature anti-corrosion device comprises a near-wall air device and an air source system of the near-wall air device, wherein the near-wall air device comprises a near-wall air bellow (4), an ash bucket (6), a lead-in section (1) of water wall tubes sunken into a boiler, a diversion section (2) of the water wall tubes sunken into the boiler, a lead-out section (3) of the water wall tubes sunken into the boiler, a near-wall air nozzle (11), a near-wall air inlet branch tube (5) and an ash discharge tube (7); a water wall sunken into the boiler is formed in a way that fins (12) and the water wall tubes (13) are connected in sequence and is positioned below an area, in which high-temperature corrosion is easy to occur, of a boiler wall of a coal-fired boiler; the near-wall air nozzle (11) is arranged on the lead-out section (3) of the water wall tubes sunken into the boiler and is formed by slits formed by cutting the fins (12) which are connected with the water wall tubes (13); the ash bucket (6) is arranged below the near-wall air bellow (4); the water wall sunken into the boiler is fixedly connected with the near-wall air bellow (4) through ribbed plates (14).

Description

technical field [0001] The invention relates to a high-temperature anti-corrosion device for a coal-fired boiler with a self-cooling function, and belongs to the technical field of high-temperature anti-corrosion for power plant boilers. Background technique [0002] The phenomenon of high-temperature corrosion of the water wall of coal-fired boilers in my country is widespread. This is because the quality of coal burned in my country is poor. 2 Strong corrosive substances such as S and [S] can easily cause slagging and high-temperature corrosion of the water wall; when low-nitrogen combustion technology is used, the problems of slagging and high-temperature corrosion of the water wall become more serious. [0003] In recent years, many colleges and universities and scientific research institutions have proposed a series of solutions to this high-temperature corrosion problem, among which the sticking wind technology is an effective measure. That is, fresh air is sent throu...

AI Technical Summary

Problems solved by technology

All these methods can achieve the effect of wind sticking to the wall, but the internal components are prone to slagging and high-temperature corrosion, so wind must be used for forced cooling, and a large amount of cold air needs to be introduced during the boiler start-up stage.

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