Novel brown coal gasification process

Abstract

The invention discloses a novel brown coal gasification process which adopts the brown coals as materials. The novel brown coal gasification process comprises the following steps of: primarily drying the brown coals; mainly drying the brown coals; and enabling the dried brown coals to react with gasifying agent under high temperature for being combusted. The fresh coal powder is dried and pre-heated by utilizing high-temperature coal gas generated by a gasifying furnace; vapor and air are sprayed to the gasifying furnace from a plurality of different layers at different heights, and are uniformly dispersed in the whole space. Carbon-containing ashes which are discharged from the bottom of the gasifying furnace and carbon-containing fine ashes generated in the whole process are fed to a coal-fired boiler for being further combusted, so that the carbon conversion efficiency is 95%-99%. The novel brown coal gasification process disclosed by the invention can be used for producing and generating furnace coal gas, water coal gas and synthesis gas or can be applied to the fields such as city gas and carbinol synthesis, synthesis ammonia and IGCC (Integrated Gasification Combined Cycle) power generation and the like. According to the novel brown coal gasification process disclosed by the invention, the coal powder is sufficiently combusted and converted during the whole process flow, the high-temperature coal gas and the vapor are circulated for use, so that the energy utilization rate is high. Besides, the novel brown coal gasification process is environment-friendly and free of pollutant emission.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a process technology for producing producer gas, water gas and synthesis gas from solid carbonaceous materials, especially lignite. Background technique [0002] In the past ten years, with the rapid development of my country's national economy and the great improvement of material living standards, high-quality non-renewable energy such as bituminous coal and anthracite has been used in large quantities, and it is an inevitable trend to become exhausted. Vigorously developing and utilizing some other resources is conducive to ensuring the stability of the country's energy supply. Lignite is the mineral coal with the lowest degree of coalification. It is the initial product of organic biorock after peat deposition after dehydration and compaction. It is named for its brown or dark brown appearance. Lignite has the characteristics of high ash content, high moisture, an...

AI Technical Summary

Problems solved by technology

Since the oxidant enters the gasifier from a single level, its distribution in the entire gasifier is not necessarily uniform, which will lead to insufficient utilization of the oxidant and incomplete combustion conversion of fuels such as coal

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