W-type flame boiler combustion and pulverizing system

Abstract

The invention discloses a W-shaped flame boiler combustion and pulverization system, which includes a furnace, a hot air pipe drawn from the outlet of an air preheater, a cold ash hopper arranged at the bottom of the furnace, a pulverized coal separator, and a pulverized coal separator. The device includes a powder return pipe. The system also includes a slag cooler and an air chamber installed at the bottom of the cold ash hopper. There are several powder feeding inlets on the front and rear walls of the cold ash hopper. There is an air distribution plate, on which bed material is loaded, the cold ash hopper is connected to the slag cooler through a hot slag pipe through the air distribution plate and the air chamber, and the hot air pipe is connected to the air inlet of the slag cooler , the air outlet of the slag cooler is connected to the air chamber through a hot air pipe, and the powder return pipe is connected to the powder feeding inlet to form a bubbling fluidized bed combustion. The invention couples the bubbling fluidized bed combustion technology and the slag cooler to the existing W flame boiler to further burn the slag, recover the waste heat of the slag, reduce the unit consumption of pulverizing and steel ball wear, and improve the combustion stability of the main combustion zone.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion, and relates to a W-shaped flame boiler combustion and pulverizing system. Background technique [0002] W-shaped flame boiler is a boiler specially designed for burning low-volatile coal such as anthracite and lean coal. Long-term practice shows that W-shaped flame design can significantly improve low-volatile coal in terms of ignition and low-load stable combustion. The performance guarantees the safe and stable operation of the unit. [0003] However, from the perspective of long-term operation, although the W-type boiler has strong adaptability to coal types, when it is used to burn low-quality anthracite, it also has prominent problems such as high carbon content in fly ash and slag, especially when burning low-volatility anthracite. , High ash coal, not only the output of slag and fly ash is large, resulting in a significant increase in combustion loss, but also the combustion sta...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a W-type flame mixed combustion mode coupled with the bubbling fluidized bed combustion technology that can combust the coarse coal particles separated by the separator of the pulverization system, improve the stability of the main combustion zone, and recover the waste heat of the slag. Boiler, used to solve the above-mentioned shortcomings of the existing W-type flame boilers when burning inferior coal

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