Fixed bed-fluidized bed serially connected gasification method and apparatus

Abstract

The invention relates to a method and a device for gasification, in particular to the method and the device for serial gasification of a fixed bed and a fluidized bed, wherein the method comprises the following steps: 1) feeding a gasification raw material with the particle size of between 13 and 50 millimeters and a gasification agent to a fixed bed gasifier to perform gasification reaction so as to generate coal gas and ash content, discharging the ash content from an ash discharging opening of the fixed bed, and introducing the coal gas to the lower part of a dense phase zone of a fluidized bed gasifier; 2) feeding a thin particle shapeed coal gasification raw material with the particle size of between 0.5 and 8 millimeters and the gasification agent into a fluidized bed gasifier to perform gasification reaction with the vertically raising coal gas so as to generate the coal and the ash content, discharging the ash content from the ash discharging opening of the fluidized bed, and introducing the coal gas into a cyclone separator; and 3) performing gas-solid separation on the coal gas in the cyclone separator, outputting the coal gas from a coal gas outlet of the cyclone separator, and sending back solid particles carried by the coal gas to the fluidized bed gasifier through a dipleg of the cyclone separator to perform the gasification reaction continuously. The method and the device have quite important significance on improving the economic benefit and reducing the sewage treatment cost for the medium and small-sized coal chemical enterprises in China.

Description

technical field [0001] The invention relates to a gasification method and device, in particular to a fixed-bed fluidized-bed serial gasification method and device. Background technique [0002] With the economic development, the demand for industrial gas and synthetic gas in my country is increasing day by day. Coal gasification technology is widely used in metallurgy, chemical industry, building materials, machinery and other industrial industries and civil gas. Coal gasification technology is mainly divided into fixed bed, fluidized bed and entrained bed gasification, atmospheric pressure coal gasification mainly adopts fixed bed and fluidized bed. [0003] Atmospheric fixed bed gasification technology is mainly based on mixed generator, UGI (UGI (atmospheric fixed bed coal gasification), water gas furnace, two-stage mixed generator, two-stage water gas furnace, etc., which have the advantages of simple operation, less investment Larger and lower equipment cost. However,...

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Problems solved by technology

The traditional fluidized bed gasification method has a high carbon content in the ash, resulting in low carbon conversion

[0005] The existing fixed-bed gasifiers that use biomass or coal as raw materials generally have a high tar content in the product gas, which seriously affects the use of coal gas

In addition, due to the periodicity of biomass growth, it also brings periodicity in the supply of biomass raw materials, which affects the continuous stability of biomass gasification production

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