Horizontal type circulating fluidized bed gasification method and device

Abstract

The invention provides a horizontal type circulating fluidized bed gasification method and device and relates to the technical field of solid carbon-containing fuel gasification. The method comprises the following steps: by adopting gasification in partitions, carrying out gasification reaction on solid carbon-containing fuel added into a first gasification chamber and a first gasifying agent in the first gasification chamber to generate raw coal gas, conveying the raw coal gas into a second gasification chamber, and separating unreacted carbon-containing solid substances and coal gas by virtue of an inertia separator; enabling the carbon-containing solid substances to fall into the second gasification chamber to be further gasified with a second gasifying agent in the second gasification chamber at gasification temperature higher than that of the first gasification chamber, so as to generate coal gas, then carrying out cyclone separation, then forming purified coal gas, outputting the purified coal gas, and returning a separated solid material to the first gasification chamber by virtue of a material returning device; and carrying out solid-state deslagging at the bottom of the first gasification chamber. The device mainly comprises the first gasification chamber, the second gasification chamber, the inertia separator, the cyclone separator, a vertical tube and the material returning device. The method and device which are provided by the invention have the advantages that the problems that carbon content of solid slag of an existing circulating fluidized bed gasification furnace is relatively high, fly ash content of coal gas is high and fly ash carbon content is high can be solved, carbon conversion rate and coal gas cooling efficiency are improved, and the carbon-containing fuel is utilized more effectively.

Description

technical field [0001] The invention relates to the technical field of gasification of solid carbon-containing fuels; in particular, it relates to a horizontal circulating fluidized bed gasification method and device, and belongs to the technical field of gasification of solid carbon-containing fuels to produce gas or syngas under fluidization. Background technique [0002] Chinese invention patent 201410117504.1, application date 2014.3.26, publication date 2014.7.9, publication number CN103911179A, name: coal gasification method and device; The carbon content of the gas is relatively high, the amount of fly ash in the gas is large, and the carbon content is high. And Chinese invention patent application 201510641319.7, application date 2015.9.30, publication date 2017.4.5, publication number CN106554826A, name: coal gasification method and device of circulating fluidized bed with fine powder ash fusion; it discloses the existing circulating fluidized Due to the low gasifi...

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Problems solved by technology

[0014] Aiming at the problems of high carbon content in solid slag, large amount of fly ash in gas, and high carbon content in fly ash in existing circulating fluidized bed gasifiers in the prior art, the technology to be solved by the embodiment of the present invention The problem is to propose a horizontal circulating fluidized bed gasification method and device with better effect

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