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Method for preparing coal water slurry

A coal-water slurry and slurry technology, which is used in the petroleum industry, liquid carbon-containing fuels, fuels, etc., can solve the problems of irregular particle size of raw coal particles at all levels, difficult-to-pulverize coal slurry effect, and inhomogeneity, etc. To achieve the effect of convenient parameter adjustment, wide range of coal adaptation, and increased concentration

Active Publication Date: 2015-11-11
CCTEG CLEAN ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although many formulas are disclosed in the prior art to assist in the calculation of which particle size distribution is more conducive to the slurrying effect of difficult-to-slurry coal, most of the formulas are limited by various practical conditions, such as the irregularity of raw coal particles and the particle size of various levels. There is a certain gap between the proportion of particle size at all levels and the conclusion of theoretical analysis, which cannot meet the actual needs.

Method used

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  • Method for preparing coal water slurry

Examples

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Effect test

Embodiment 1

[0040] A method for preparing coal-water slurry from Mengdong lignite, said Mengdong lignite is Dongming Coal Mine lignite in Hailaer, Inner Mongolia, the analysis water is 14.8%, the total water is 32%, the ash content is 12.4%, and the particle size is less than 50mm; The method includes the following steps:

[0041] (1) crushing the Mengdong lignite to below 13mm to obtain the first slurry;

[0042] (2) Mix 75wt% of the first slurry with production water in a mass ratio of 3.5:2, then add 0.2wt% sodium humate to obtain the second slurry; dry the remaining first slurry, and carry out selective screening points to obtain the eighth slurry with a particle size of 150-1000 μm;

[0043] (3) Shaping, stirring and grinding the second slurry to spherical particles at 19° C. at a stirring and grinding speed of 20 m / s to obtain the third slurry. The solid content of the third slurry is 35%, and the largest particle Less than 2.4mm, D38 is 75μm;

[0044] (4) Dehydrate and upgrade 8...

Embodiment 2

[0049]A method for preparing coal-water slurry from coal in the Wucaiwan coal mine in the Junggar area of ​​Xinjiang, the coal in the Junggar area of ​​Xinjiang has an analysis water of 11.3%, a total water of 18.6%, an ash content of 13.1%, and a particle size of less than 50mm; the method Including the following steps:

[0050] (1) crushing the coal in the Junggar region of Xinjiang to below 13 mm to obtain the first slurry;

[0051] (2) Mix 85wt% of the first slurry with production water in a mass ratio of 3.8:2, then add 0.1wt% lignosulfonate to obtain the second slurry; dry the remaining first slurry, and select sieving to obtain the eighth slurry with a particle size of 150-1000 μm;

[0052] (3) Shaping, stirring and grinding the second slurry to spherical particles at 22° C. at a stirring and grinding speed of 20 m / s to obtain the third slurry. The solid content of the third slurry is 40%, and the largest particle Less than 2.4mm, D38 is 75μm;

[0053] (4) 84wt% of t...

Embodiment 3

[0058] A method for preparing coal-water slurry from coal in the Ordos Shenfu area of ​​Inner Mongolia, the coal in the Ordos Shenfu area of ​​Inner Mongolia has an analysis water of 5.7%, a total water of 13.6%, ash content of 6.9%, and a particle size of less than 50mm; the method Including the following steps:

[0059] (1) crushing the coal in the Shenfu area of ​​Ordos, Inner Mongolia to less than 13 mm to obtain the first slurry;

[0060] (2) Mix 80wt% of the first slurry with production water in a mass ratio of 4:2, then add 0.1wt% lignosulfonate to obtain the second slurry; dry the remaining first slurry, and select sieving to obtain the eighth slurry with a particle size of 150-1000 μm;

[0061] (3) Shaping, stirring and grinding the second slurry to spherical particles at 22°C and at a stirring and grinding speed of 20m / s to obtain the third slurry, the solid content of the third slurry is 44%, the largest particle Less than 2.4mm, D40 is 75μm;

[0062] (4) Dehydra...

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Abstract

The invention relates to a method for preparing coal water slurry. Dry coal which is difficult to form slurry is crushed in steps; and then, steps such as coarse grinding, dehydrating, fine grinding, super-fine grinding and the like are carried out in parts; after the dry coal is mixed in a specific proportion, a gap formed during coal particle stacking is perfectly filled, and the stacking efficiency is improved, so that the concentration of the coal water slurry is improved; and the prepared coal water slurry can meet needs of gasification and combustion application. The method for preparing coal water slurry provided by the invention has the characteristics of a wide application scope of coal types, capacity of carrying out long-period continuous production, and convenience in parameter regulation.

Description

technical field [0001] The invention belongs to the field of coal-water slurry preparation, and relates to a method for preparing coal-water slurry, in particular to a method for preparing coal-water slurry from low-rank coal, in particular to a method made of lignite, long-flame coal, non-sticky coal, weak A method for preparing coal-water slurry from hard-to-slurry coal such as sticky coal. Background technique [0002] my country's energy structure is rich in coal, poor in oil, and low in gas. Coal accounts for about 70% of my country's energy consumption, and for a long time to come, coal will remain the main energy source in my country. [0003] Coal water slurry is made by mixing coal powder with a certain graded fineness and water. It has certain stability and fluidity. It is a slurry coal product that can be pumped for a long distance. It is a clean coal-based fluid fuel and raw material. It has the advantages of convenient preparation, storage, transportation and us...

Claims

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Application Information

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