Method for preparing coal-water slurry using fractal grading technology and prepared coal-water slurry

A technology of coal-water slurry and slurry, which is applied in the petroleum industry, liquid carbon-containing fuel, fuel, etc., can solve the problems of low coal-water slurry accumulation efficiency, low concentration of coal-water slurry, and poor stability, so as to expand the scope of application, High concentration and good stability

Active Publication Date: 2018-04-06
CCTEG CLEAN ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coal-water slurry has good fluidity and high coal concentration, such as 60%, but the obtained coal-water slurry has low accumulation efficiency, low concentration of coal-water slurry, high water separation rate and poor stability, so it is not applicable for all coal types

Method used

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  • Method for preparing coal-water slurry using fractal grading technology and prepared coal-water slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing coal-water slurry by using Shenfu coal as coal raw material. Shenfu coal is a kind of common coal in Inner Mongolia area. The analytical water is 4.9%, the total water is 13%, and the ash content is 13.9%.

[0053] The method comprises the steps of:

[0054] (1) crushing the coal raw material to obtain the first slurry with a particle size≤13mm;

[0055] (2) Divide the first slurry into slurry I and slurry II, the pulverized coal in the slurry I accounts for 75wt% of the quality of the pulverized coal in the first slurry, and the pulverized coal in the slurry II accounts for 75% by weight of the first slurry 25wt% of the pulverized coal mass in the material, the slurry I and water are subjected to shaping wet rough grinding with a mass ratio of 7:3 to obtain the second slurry with a pulverized coal particle size of 2000 μm;

[0056] (3) Return a part of the second slurry as slurry I ' to the raw material of the shaping wet ball mill (the coal pow...

Embodiment 2

[0065] The invention discloses a method for preparing coal-water slurry from Xinjiang Hongshan coal as coal raw material. Hongshan coal is a common coal in Xinjiang area, the total water content is 24%, and the ash content is 14%.

[0066] The method comprises the steps of:

[0067] (1) crushing the coal raw material to obtain the first slurry with a particle size≤13mm;

[0068] (2) Divide the first slurry into slurry I and slurry II, the pulverized coal in the slurry I accounts for 80wt% of the quality of the pulverized coal in the first slurry, and the pulverized coal in the slurry II accounts for 80% by weight of the first slurry 20wt% of the pulverized coal mass in the material, the slurry I and water are subjected to shaping wet rough grinding in a mass ratio of 8:2 to obtain the second slurry with a pulverized coal particle size of 1000 μm;

[0069] (3) mixing slurry II, water and additives in a mass ratio of 70:30:0.1 for shaping wet fine grinding to obtain a third slu...

Embodiment 3

[0078] The invention discloses a method for preparing coal-water slurry from lignite as coal raw material. Lignite is a common coal in Inner Mongolia. The analyzed water is 20.8%, the total water is 34.5%, and the ash content is 8.5%.

[0079] The method comprises the steps of:

[0080] (1) crushing the coal raw material to obtain the first slurry with a particle size≤13mm;

[0081] (2) Divide the first slurry into slurry I and slurry II, the pulverized coal in the slurry I accounts for 85wt% of the quality of the pulverized coal in the first slurry, and the pulverized coal in the slurry II accounts for 85% by weight of the first slurry 15wt% of the mass of coal powder in the material, the slurry I and water are subjected to shaping wet rough grinding according to the mass ratio of 7:3 to obtain the second slurry with a particle size of coal powder of 600 μm;

[0082] (3) A part of the second slurry is added as slurry I' back to the raw material of the shaping wet ball mill (...

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Abstract

The invention provides water-coal-slurry and a preparation method thereof. The preparation method of the water-coal-slurry comprises the steps of mixing a mixture of slurry A, slurry B, slurry C and slurry D with water and an additive; kneading and mixing to obtain mixed slurry; then shearing to obtain the water-coal-slurry, wherein the grain size of pulverized coal in the slurry A is 500 to 2,400mum; the grain size of pulverized coal in the slurry B is 300 to 500mum; the grain size of pulverized coal in the slurry C is 10 to 30mum; the grain size of pulverized coal in the slurry D is less than or equal to 10mum. The invention utilizes graded crushing, fractal grinding and multigrade grading theories to guide, develop and process a novel pulping process, so that the optimum granularity grading of the water-coal-slurry is realized. Compared with other process technologies, the gasification energy consumption and the production cost are reduced, the effective gas proportion is improved, the application range of raw materials is expanded, the coal pulp concentration can be improved by 6 to 8 percent, the stability is good, and the water separating proportion is less than 10 percent after 48-hour standing.

Description

technical field [0001] The invention belongs to the technical field of clean utilization of coal resources, and relates to a coal-water slurry and a preparation method thereof, in particular to a method for preparing the coal-water slurry by utilizing a fractal gradation technology and the prepared coal-water slurry. Background technique [0002] Coal Water Mixture (CWM) has obvious social, economic and environmental benefits among clean fuels. It is in line with my country's national conditions of coal-rich, oil-deficient, and gas-poor and realizes the energy strategy of "replacing oil with coal", which is beneficial to urban Sustainable development, broad prospects for promotion and application in our country. The environmental benefits, economic benefits and energy saving benefits of the development of coal water slurry have been initially reflected. [0003] As a new type of clean fuel, coal water slurry can not only effectively solve the problem of "expensive fuel oil a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32
CPCC10L1/326
Inventor 何国锋段清兵吕向阳张胜局王冉
Owner CCTEG CLEAN ENERGY CO LTD
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