Production process for concentrating water coal slurry by gasification in coal chemical industry and used device

Abstract

The invention discloses a production process for concentrating water coal slurry by gasification in coal chemical industry and a used device. The production process comprises the following steps of: (1) putting steam coal with the particle size being less than or equal to 20mm into a plurality of rod grinder for grinding to obtain coarse water coal slurry, then entering rod-grinder buffering tanksafter carrying out primary sieving, and pumping to a slurry accumulating groove; (2) drawing 10%-20% of the coarse water coal slurry entering the slurry accumulating groove, conveying the drawn coarse water coal slurry and the steam coal with the particle size being less than or equal to 6mm into a ball grinder for grinding to obtain 325-mesh fine water coal slurry with the passing rate being 75%, then leading the fine water coal slurry to enter a ball-grinder buffering tank, and pumping to a mixing stirrer; pumping the other coarse water coal slurry entering the slurry accumulating groove tothe mixing stirrer; (3) mixing and stirring the fine water coal slurry and the coarse pumped into the mixing stirrer; (4) leading the water coal slurry after primary sieving into the buffering tank,pumping into a gasifying furnace as a coal gasifying material to carry out gasification. The production process disclosed by the invention has the beneficial effects that the concentration of the water coal slurry is increased by 2%-3%, and the gasifying efficiency and the coal conversion efficiency of the gasifying furnace are greatly improved.

Description

technical field [0001] The invention belongs to the field of gasification coal-water slurry pulping, and in particular relates to a coal chemical gasification coal-water slurry thickening production process and a device used therefor. Background technique [0002] The current coal chemical gasification pulping process uses a wet rod mill as a grinding device, which has a large capacity, relatively coarse gasification slurry particles (200 mesh pass rate of 75%), and low accumulation efficiency of coal-water slurry. Therefore, thermal coal is used The concentration of pulping coal-water slurry is generally only 58% to 60%. However, the CWS particles after ball mill grinding are relatively fine (325 mesh pass rate is 75%), and the CWS accumulation efficiency is high, so the CWS concentration can reach up to 63% to 65%. Through the mixing of coarse slurry and fine slurry, the accumulation efficiency of the slurry is improved, and the gasification efficiency and conversion effi...

AI Technical Summary

Problems solved by technology

The traditional two-stage pulping and thickening technology adopts rod mill + wet vertical fine mill. Due to technical limitations, the largest fine mill in China currently has a specification of 5000L / h, which has small production capacity, high energy consumption, and high failure rate. Can no longer meet the continuous production requirements of modern large-scale coal chemical industry

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