Method for preparing high concentration water-coal-slurry by low-rank coal

A high-concentration water and low-rank coal technology, applied in the direction of combustion methods, block/powder fuel preparation, combustion equipment, etc., can solve the problems of high processing temperature, long processing time, etc., to improve particle size distribution and reduce preparation energy consumption effect

Active Publication Date: 2008-05-07
CHINA COAL RES INST CCRI ENERGY SAVING TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

This method can effectively improve and subsequently reduce the water content of low-rank coal, but this method adopts higher treatment temperature and longer treatment time, which is contrary to the lower temperature and shorter time required by industrialization , thus limiting the wide use of low-rank coal in the preparation of high-concentration coal-water slurry

Method used

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  • Method for preparing high concentration water-coal-slurry by low-rank coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The low-rank raw coal used in this example is Shangwan coal with a water content of 7.5%. The process of utilizing this coal to prepare high-concentration coal-water slurry is as follows:

[0030] (1) Ultra-fine crushing of Shangwan coal until the coal particle size reaches 1mm;

[0031] (2) Mix the crushed Shangwan coal particles with water in a mass ratio of 7:3, and then send the mixture into a coarse grinder for wet coarse grinding, so that the particle size of the coal particles in the coal slurry formed at the outlet of the coarse grinder ≤800μm, coal particle size less than 75μm in the coal slurry accounts for more than 60% of the total mass of dry coal;

[0032] (3) Mix 20% of the coal slurry flow at the outlet of the coarse mill with water in a mass ratio of 10:3, and then send the mixture into the fine mill for wet fine grinding, so that the coal in the coal slurry at the outlet of the fine mill Particle size≤20μm;

[0033] (4) 50% of the coal slurry amount...

Embodiment 2

[0039] The low-rank raw coal used in this example is Chifeng coal with a water content of 14%. The process of utilizing this coal to prepare high-concentration coal-water slurry is as follows:

[0040] (1) Superfinely crush Chifeng coal until the coal particle size reaches 1mm;

[0041] (2) Mix the crushed Chifeng coal particles with water in a mass ratio of 6:4, and then send the mixture into a coarse grinder for wet coarse grinding, so that the particle size of the coal particles in the coal slurry formed at the outlet of the coarse grinder is ≤ 1000μm, coal particle size less than 75μm in the coal slurry accounts for more than 50% of the total mass of dry coal;

[0042] (3) Mix 10% of the coal slurry flow rate at the outlet of the coarse mill with water in a mass ratio of 5:1, and then send the mixture into the fine mill for wet fine grinding, so that the coal in the coal slurry at the outlet of the fine mill Particle size≤20μm;

[0043] (4) The coal slurry after the wet...

Embodiment 3

[0048]The low-rank raw coal used in this example is Halagou coal with a water content of 5%. The process of utilizing this coal to prepare high-concentration coal-water slurry is as follows:

[0049] (1) Carry out ultra-fine crushing of the Halagou coal until the coal particle size reaches 1mm;

[0050] (2) Mix the broken Halagou particles with water in a mass ratio of 8:2, and then send the mixture into a coarse grinder for wet coarse grinding, so that the particle size of the coal particles in the coal slurry formed at the outlet of the coarse grinder ≤800μm, coal particle size less than 75μm in the coal slurry accounts for more than 60% of the total mass of dry coal;

[0051] (3) Mix 30% of the coal slurry flow rate at the outlet of the coarse mill with water in a mass ratio of 5:2, and then send the mixture into the fine mill for wet fine grinding, so that the coal in the coal slurry at the outlet of the fine mill Particle size≤15μm;

[0052] (4) The coal slurry after t...

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Abstract

The invention relates to a method for preparing high-concentration coal-water slurry by using low-rank coal. The steps include: 1) ultrafine crushing of low-rank coal; 2; 3) wet coarse grinding of the mixture; 4) ① mix 10% to 30% of the total amount of coal slurry after coarse grinding with water in a mass ratio of 5:1 to 2, and then carry out Wet fine grinding; ②The coal slurry after wet coarse grinding other than wet fine grinding is directly sent to the filter device; 5) The coal slurry after step 4) ① fine grinding is processed in the following way: ①Return all the coal slurry to step 3 ) for circulating coarse grinding; or ② return part of the coal slurry to step 3) for circulating coarse grinding, and send another part of finely ground coal slurry directly into the filter device; or ③ directly send all the coal slurry into the filter device; 6) The coal slurry sent to the filter device is filtered through a 18-20 mesh filter, and then stirred at a high speed in the stirring device, left standing, or stirred at a low speed to obtain a high-concentration coal-water slurry product.

Description

technical field [0001] The invention relates to a method for preparing coal-water slurry, in particular to a method for preparing high-concentration coal-water slurry by using low-rank coal. Background technique [0002] At present, international oil prices remain high, and fuel resources are increasingly in short supply, and coal-water slurry is an ideal substitute for fuel oil. The concentration and particle size of coal water slurry directly affect the effect of coal water slurry replacing fuel oil. In the preparation process of coal water slurry, the pulping process plays a very important role. The quality of the pulping process directly affects the final preparation concentration of coal water slurry and the energy consumption and cost of pulping. To prepare high-concentration coal-water slurry by conventional pulping process, it is often necessary to select coal types that are easy to slurry (low water content), and low-rank coal, which accounts for the largest propor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K1/02
Inventor 何国锋段清兵王国房贾传凯梁兴纪磊刘解王秀月
Owner CHINA COAL RES INST CCRI ENERGY SAVING TECH CO LTD
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