Device and method for blowing ash in entrained flow gasifier

Abstract

The invention discloses a device and a method for blowing ash in an entrained flow gasifier. The device comprises a pipe joint, an annular main pipe, a plurality of first branch pipes and a plurality of second branch pipes, wherein the pipe joint is welded on the shell of the entrained flow gasifier and extends into the entrained flow gasifier, the annular main pipe is arranged between the shell of the entrained flow gasifier and the water cooled wall of the entrained flow gasifier and is connected with the pipe joint, the first branch pipes are communicated with the annular main pipe, and the second branch pipes are communicated with the first ash blower branch pipes respectively, penetrate through the water cooled wall of the entrained flow gasifier and are arranged on the inner surface of the water cooled wall of the entrained flow gasifier. The head part of each second ash blower branch pipe is provided with two small holes, and the small holes are aligned to the ash deposition position of the water cooled wall 6 of the entrained flow gasifier. The method comprises the following steps: introducing N2 or CO2 into the device, and blowing the surface of the water cooled wall of the entrained flow gasifier continuously through the small holes to prevent the deposition of ash. By adopting the device and the method, the deposition of the ash and the formation of an adhesive bottom layer can be inhibited, the flying ash can be blown away before being adhered onto the heated surface, and the adhesion of the flying ash can be reduced. The device and the method have the characteristics of good ash blowing effect and low consumption of gases for ash blowing.

Description

technical field [0001] The invention relates to the technical field of coal-based synthesis gas dedusting, in particular to a soot blowing device and a soot blowing method used in an entrained bed gasification furnace. Background technique [0002] Entrained bed gasification is an important form of coal gasification. The raw coal is fed into the furnace in powder form. The pulverized coal and gasification agent are sprayed into the gasifier through nozzles or burners, and are fully mixed and Combustion and gasification reactions. The gasification furnace provides a reaction space for the gasification reaction. The reaction temperature of the entrained bed gasification is very high, generally maintained at a high temperature of 1400-1600 ° C, thus ensuring the complete conversion of carbon. After the high-temperature gas leaves the gasifier, the temperature of the gas needs to be lowered. Generally, there are two ways to reduce the temperature: water-cooled wall tube heat ex...

AI Technical Summary

Problems solved by technology

Since fly ash is carried in the gas, and fly ash is sticky at high temperature, the fly ash will bond on the heating surface of the arranged water-cooled wall. When the bonding bottom layer is formed, the fly ash will be more easily bonded to the heating surface The bonded fly ash is not easy to be taken away by the gas, thus blocking the gas channel and forming ash blockage, resulting in the failure of normal operation of the equipment

[0004] At present, there is an existing device, which adopts the intermittent soot blowing method. When the fly ash is deposited on the heating surface of the water wall, the bonded ash is blown away with a large instantaneous air volume, which is a method of post-processing. The blowing gas volume is large, and it is not easy to blow off the ash

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