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

A technology of high-concentration water and coal slurry, which is applied in the field of preparing high-concentration coal-water slurry and preparing high-concentration coal-water slurry with fine crushing and less grinding, can solve the problem of unreasonable particle size distribution of coal slurry, low gasification efficiency and low effective gas content and other problems, to achieve the effect of saving pulping energy consumption, reducing pulping cost and good fluidity

Active Publication Date: 2019-01-04
CHINA COAL RES INST CCRI ENERGY SAVING TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1, high concentration coal-water slurry is prepared by finely breaking and less grinding

[0036] The raw coal is Xinjiang Heishan coal (hereinafter referred to as "Heishan coal"), and its total water Mt=20%, Aar=14%, Var=30%.

[0037] according to figure 1 In the process of preparing high-concentration coal-water slurry by finely breaking and less grinding in the present invention, the process of using the raw coal to prepare high-concentration coal-water slurry is as follows:

[0038] (1) Finely crushing Heishan coal to prepare coal powder with a particle size≤1.0mm to obtain fine coal powder;

[0039] (2) Add fine coal powder, water and sodium lignin sulfonate into a mixing tank according to the mass ratio of 1:0.9:0.005 on a dry basis, and stir to prepare a slurry with a concentration of 45wt%;

[0040] (3) Send the slurry prepared in step (2) into a wet fine grinder for grinding, and prepare a fine slurry with an average particle diameter of 18 μm, whi...

Embodiment 2

[0045] Embodiment 2, preparation of high-concentration coal-water slurry by fine crushing and less grinding

[0046] The Shenfu coal used is a common long-flame coal in northern Shaanxi, containing 5.9% of analytical water, 12.8% of total water, and 19.9% ​​of ash.

[0047] according to figure 1 In the process of preparing high-concentration coal-water slurry by finely breaking and less grinding in the present invention, the process of using the raw coal to prepare high-concentration coal-water slurry is as follows:

[0048] (1) finely crushing Shenfu coal to prepare pulverized coal with a particle size of ≤0.8mm;

[0049] (2) Add the fine coal powder, water and ammonium lignosulfonate into the mixing tank according to the mass ratio of 1:1:0.005 on a dry basis, and stir to prepare a slurry with a concentration of 45wt%;

[0050] (3) Send the slurry prepared in step (2) into a wet fine grinder for grinding, and prepare a fine slurry with an average particle diameter of 20 μm...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32
CPCC10L1/326C10L2290/24C10L2290/28
Inventor 蔡洪涛王国房李发林苏鑫韩崇刚王建军何红兴杜丽伟张桂玲张静边岳
Owner CHINA COAL RES INST CCRI ENERGY SAVING TECH CO LTD
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