Coal gasification system and coal water slurry concentration method

Abstract

The invention relates to the technical field of coal gasification, and provides a coal gasification system and a coal water slurry concentration method. The system comprises a pulping and conveying unit, an additive breaking unit, a moisture separation unit, a gasification furnace and a moisture collection tank; the pulping and conveying unit comprises a coal mill, a coal slurry tank and a coal slurry feeding pump which are connected in sequence; the coal slurry feeding pump is connected with the additive breaking unit; the additive breaking unit is used for breaking the structure of the additive; the moisture separation unit is used for separating moisture in the coal water slurry with the broken additive structure, the additive breaking unit is connected with the moisture separation unit, the moisture separation unit is provided with a water outlet and a coal outlet, the water outlet is connected with the moisture collection tank, and the coal outlet is connected with the gasification furnace; the concentration of the coal water slurry is increased, a large amount of water is prevented from entering the gasification furnace to evaporate and occupy heat in the gasification furnace, so that additional energy consumption for maintaining the temperature in the gasification furnace is avoided, and the coal water slurry gasification cost is saved.

Description

technical field [0001] The invention belongs to the technical field of coal gasification, and in particular relates to a coal gasification system and a method for thickening coal water slurry. Background technique [0002] At present, coal water slurry is mainly used in coal water slurry gasification technology. Coal water slurry is composed of coal powder with a certain particle size, water and additives in a certain proportion. It has good stability, fluidity and other properties, and is safe to store. , transportation and measurement are convenient, and can be transported over long distances. [0003] Since the coal-water slurry is required to have good stability and fluidity during storage and transportation, additives need to be added. The use of additives greatly limits the increase of coal slurry concentration while ensuring stability and fluidity. The concentration of the existing industrial coal-water slurry is basically around 60% (wt). During the gasification pr...

AI Technical Summary

Problems solved by technology

The use of additives greatly limits the increase of coal slurry concentration while ensuring stability and fluidity

The concentration of the existing industrial coal-water slurry is basically around 60% (wt). During the gasification process, a large amount of water in the coal-water slurry needs to be evaporated, and the evaporation of water will absorb the heat in the gasifier, so it takes more Too much pulverized coal and oxygen are burned to maintain the coal gasification reaction temperature in the gasifier, resulting in generally low overall efficiency of coal-water slurry gasification technology, high specific coal consumption, specific oxygen consumption, and low effective gas content

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