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A method of preparing gasified coal-water slurry by combining dry coal powder and semi-coke

A technology for gasifying coal-water slurry and drying coal, which is applied in the petroleum industry, liquid carbon-containing fuels, fuels, etc., and can solve the problems of difficult processing, utilization, storage and transportation of dry coal powder

Active Publication Date: 2017-10-27
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to increase the overall slurry concentration of lignite, make full use of the waste water produced in the pyrolysis process, and solve the safety problem that dry coal powder is difficult to process, utilize, store and transport

Method used

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  • A method of preparing gasified coal-water slurry by combining dry coal powder and semi-coke

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Experimental program
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Effect test

Embodiment 1

[0010] The lignite dried at 100-200°C is taken and sieved to obtain a dry powder smaller than 6mm. The dry coal powder smaller than 6mm is further crushed and ground until the particle size smaller than 0.075mm accounts for 34.9%, and its air-dry basis moisture is 9.2%, which is used as raw material for pulping coarse powder. Continue to pyrolyze dry coal blocks larger than 6mm at 500-600°C to obtain semi-coke. The semi-coke is further crushed and ground until the particle size of less than 0.075mm accounts for 74.0%, and its air-drying basis moisture content is 3.5%, which is used as a fine powder raw material for pulping. Take 60% of the above-mentioned coarse powder and 40% of the above-mentioned fine powder according to the mass ratio, add a naphthalene-based dispersant accounting for 1.0% of the total mass of the dry base coarse and fine coal powder, add pyrolysis process wastewater accounting for 32% of the total mass of the coal-water slurry, Stir evenly to prepare a c...

Embodiment 2

[0012] The lignite dried at 180-280°C is taken and sieved to obtain a dry powder smaller than 3mm. The dry coal powder smaller than 3mm is further crushed and ground until the particle size smaller than 0.075mm accounts for 30.2%, and its air-dry basis moisture is 6.1%, which is used as raw material for pulping coarse powder. Continue to pyrolyze dry coal blocks larger than 3mm at 500-700°C to obtain semi-coke. The semi-coke was further crushed and ground until the particle size smaller than 0.075mm accounted for 84.8%, and its air-dried basis moisture content was 4.5%, which was used as a fine powder raw material for pulping. Take 50% of the above-mentioned coarse powder and 50% of the above-mentioned fine powder according to the mass ratio, add a naphthalene-based dispersant accounting for 1.2% of the total mass of the dry base coarse and fine coal powder, add pyrolysis process wastewater accounting for 37% of the total mass of the coal-water slurry, Stir evenly to prepare ...

Embodiment 3

[0014] The lignite is dried at 120-200° C. and then sieved to obtain a dry powder smaller than 6 mm. The dry powder smaller than 6mm was further crushed and ground until the particle size smaller than 0.075mm accounted for 45.1%, and its air-drying basis moisture was 12.2%, which was used as raw material for pulping coarse powder. Continue to pyrolyze dry coal larger than 6mm at 500-700°C to obtain semi-coke. The semi-coke is further crushed and ground, so that the particle size smaller than 0.075mm accounts for 88.3%, and its air-dried basis moisture is 1.0%, which is used as a fine powder raw material for pulping. Take 55% of the above-mentioned coarse powder and 45% of the above-mentioned fine powder according to the mass ratio, add a naphthalene-based dispersant accounting for 1.2% of the total mass of the dry base coarse and fine coal powder, add new water accounting for 35% of the total mass of the coal-water slurry, and stir evenly , the prepared concentration is 59.2%...

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Abstract

The invention relates to a method for preparing gasified coal-water slurry by coordinating dried coal powder and semi-coke, which is suitable for the technological process of increasing the concentration of lignite-coal-water slurry by adopting lignite drying and pyrolysis processing. The method aims at preparing high-concentration lignite coal-water slurry, and grades and optimizes dry products and pyrolysis products to make slurry, and the concentration of the coal-water slurry reaches 59-65%. The principle of obtaining high-concentration lignite coal-water slurry is that dry coal powder has poor grindability and high activity, and is suitable as a coarse powder component of pulping raw materials, which can effectively increase the concentration of coal-water slurry; semi-coke slurry The performance has been greatly improved and the grindability is good, but the reactivity is slightly poor, and it is suitable as a fine powder component of pulping raw materials. The use of dry lignite powder as a pulping coarse powder component can avoid the defect of poor slurryability of dry lignite, reduce the energy consumption of ore grinding, and because of its good reactivity, it is not necessary to prolong the gasification reaction time due to the increase in particle size. At the same time, the gasification time of coarse and fine particles in the coal-water slurry in the entrained bed is similar, and the carbon loss rate is low.

Description

technical field [0001] The invention relates to a method for preparing gasified coal-water slurry by combining dried coal powder and semi-coke, and belongs to the field of high-value and clean utilization of coal. Background technique [0002] Lignite thermal upgrading includes drying and pyrolysis. The moisture of lignite can be reduced by drying; the volatile content of lignite can be reduced by pyrolysis, and the calorific value and stability of lignite can be improved. The slurrying property of lignite is improved after drying, but it cannot meet the concentration requirement of gasified coal-water slurry; the slurrying property of lignite is greatly improved after pyrolysis, but the pyrolysis of lignite requires raw material to have a certain lumpiness. Due to the particularity of lignite coal quality, lignite will be severely fragmented and pulverized during the drying and thermal upgrading process, resulting in a large number of pulverized products in the drying and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32C10L1/16C10L1/192C10L1/18
Inventor 初茉赵曼曲洋
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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