Method for carrying out coal gasification regionally by fixed bed

Abstract

The invention relates to a method for carrying out coal gasification regionally by a fixed bed. In the method, the middle upper part of a gas furnace is divided into two gasification regions by a partition wall; in the blowing phase, a blowing valve and a nitrogen adding valve at the bottom of the gas furnace are opened, two chimney valves at the middle upper part of the gas furnace are opened, other valves are closed, air enters the gas furnace to be burnt, the temperature of the gas furnace is raised, and generated blowing gas is sent to a post station from the chimney valves to be processed; in the gas preparation phase, the nitrogen adding valve at the bottom of the gas furnace is opened, gas valves and steam valves in the two regions at the middle upper part of the gas furnace are opened and closed alternately, one region is used for conveying gas outside while the other region is used for conveying steam inwards simultaneously, and other valves are all closed; the air added with nitrogen enters the gas furnace to be burnt, high temperature air gas is generated, and steam enters the furnace to react so as to generate high temperature water gas; and two streams of high temperature gas are transversely and longitudinally mixed and flow in a horizontal and vertical crossed mode between gasification layers to continuously perform a gasification reaction and finally is output outwards through the regions where the gas valves are opened. The method has high steam resolution ratio, high gas production rate, high gas quality, low carbon residue of slags and obvious effects of saving energy and reducing consumption.

Description

technical field [0001] The invention relates to a coal gasification production method, in particular to a fixed-bed sub-area coal gasification method. Background technique [0002] The existing fixed-bed intermittent gas cycle production method is divided into six stages: blowing, blowing, recycling, up blowing, down blowing, and secondary up blowing. This method has a low steam decomposition rate and the residual carbon content of the slag is as high as 20-30%. , resulting in a serious waste of resources. How to increase the steam decomposition rate, reduce the amount of residual carbon in slag, and save resources has become an urgent problem to be solved. Contents of the invention [0003] The present invention aims at the defects of the existing fixed-bed intermittent gas production cycle production method, and provides a fixed-bed subregional coal gasification method, which realizes the purpose of improving the steam decomposition rate, reducing the amount of slag res...

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Problems solved by technology

[0002] The existing fixed-bed intermittent gas cycle production method is divided into six stages: blowing, blowing, recycling, up blowing, down blowing, and secondary up blowing. This method has a low steam decomposition rate and the residual carbon content of the slag is as high as 20-30%. , resulting in a serious waste of resources

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