Method for preparing high-concentration coal water slurry by means of fine crushing and little grinding

Abstract

The invention discloses a method for preparing high-concentration coal water slurry by means of fine crushing and little grinding. The method includes steps of (1), mixing and stirring fine coal powder, water and additives with one another in mixing and stirring tanks to obtain slurry; (2), finely grinding the slurry by the aid of wet processes to obtain fine slurry A, feeding the fine slurry A back into the mixing and stirring tanks, mixing and stirring the fine slurry A, the fine coal powder, the water and the additives with one another to obtain finished coal water slurry, diluting a part of the finished coal water slurry by water and then finely grinding the diluted finished coal water slurry by the aid of wet processes to obtain fine slurry B, feeding the fine slurry B back into the mixing and stirring tanks in a circulation manner and carrying out mixing and stirring steps. The method has the advantages that the high-concentration coal water slurry is prepared by means of fine crushing and little grinding, the conventional single-rod / ball mill ore grinding slurry production can be replaced, slurry production energy consumption can be saved by 40-65%, accordingly, the slurry production cost can be obviously reduced, and the high-concentration coal water slurry is high in concentration, low in viscosity and good in flowability and stability.

Description

technical field [0001] The invention relates to a method for preparing high-concentration coal-water slurry, in particular to a method for preparing high-concentration coal-water slurry through fine crushing and less grinding, and belongs to the technical field of coal-water slurry. Background technique [0002] Coal water slurry is a coal-based fluid raw material composed of coal, water and additives. As a raw material for gasification of coal water slurry, it is widely used in the production of chemical products such as synthetic ammonia, methanol, olefins, oil products and natural gas. According to incomplete statistics, by the end of 2017, the gasification coal-water slurry consumption of coal chemical enterprises in my country has exceeded 300 million tons per year; coal-water slurry is also a low-pollution coal-based fluid fuel, which is widely used in power station boilers, industrial boilers and Industrial kilns, burning instead of oil, gas and coal. [0003] At pres...

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Problems solved by technology

[0005] (1) Low pulping concentration

In the process of preparing gasified coal-water slurry by conventional single-rod mill, due to the lack of adjustment means, unreasonable particle size distribution of coal slurry, poor rheology and stability of coal slurry, the concentration of coal slurry is low, generally 58-61wt%

Because the coal-water slurry carries a large amount of excess water into the gasifier, the gasification efficiency of the coal-water slurry gasification is low, and the effective gas content is low, generally 79-80%;

[0006] (2) High energy consumption for pulping

When using a conventional single rod mill to prepare gasified coal-water slurry, the raw coal is generally crushed to less than 13mm, and directly enters the rod mill for wet grinding and pulping. Due to low grinding efficiency and high energy consumption, the production cost of pulping is high.

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