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Method for preparing coal-water slurry by treating and modifying lignite or long-flame coal

A long-flame coal and coal-water slurry technology, which is applied in liquid carbon-containing fuels, petroleum industry, fuels, etc., can solve the problems of high energy consumption, high operating costs, and high equipment requirements, and achieve low energy consumption, low operating costs, The effect of improving grindability

Active Publication Date: 2021-01-26
辽宁大唐国际阜新煤制天然气有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the reaction temperature of the method disclosed in Chinese patent CN104449917B is relatively low, yet, the drying step adopted in the method needs to be carried out under an inert gas environment, and the equipment requirements are high, and the water content of lignite is reduced to below 4% (need to remove Partially bound water,), high energy consumption, high operating costs

Method used

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  • Method for preparing coal-water slurry by treating and modifying lignite or long-flame coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Take Huolinhe lignite with a total water content of 32.9%, a low calorific value of 3216kCal / kg, an ash content of 14.6%, and a particle size of less than 6mm, and dry it at 130°C for 40 minutes to obtain a water content of 17%. The dried lignite is treated and modified under a nitrogen atmosphere at 250° C., the residence time is controlled at 75 minutes, and naturally cooled to 80° C. to obtain the cooled modified coal.

[0052] The cooled modified coal is placed in a coal mill for coal grinding and sample preparation. Use 0.2mm and 0.074mm sieves to sieve coal samples. Coal samples that do not pass through the 0.2mm sieve (that is, coal samples with a particle size greater than 0.2mm) are re-sent to the coal mill for grinding, and those that pass the 0.2mm sieve but fail to pass Coal samples with a 0.074mm sieve (that is, coal samples with a particle size smaller than 0.2mm and larger than 0.074mm) and coal samples that pass through a 0.074mm sieve (that is, coal sam...

Embodiment 2

[0054] Take Huolinhe lignite with a total water content of 32.9%, a low calorific value of 3216kCal / kg, an ash content of 14.6%, and a particle size of less than 6mm, and dry it at a temperature of 150°C for 30 minutes to obtain a water content of 12%. The dried lignite is treated and modified under a nitrogen atmosphere at 275° C., the residence time is controlled at 60 minutes, and naturally cooled to 60° C. to obtain cooled modified coal.

[0055] The cooled modified coal is placed in a coal mill for coal grinding and sample preparation. Use 0.2mm and 0.074mm sieves to sieve the coal samples, and the coal samples that do not pass the 0.2mm sieve (that is, the coal samples with a particle size greater than 0.2mm) are sent to the coal mill again, and the coal samples that pass the 0.2mm sieve but fail to pass the 0.074mm sieve The coal sample (that is, the coal sample with a particle size smaller than 0.2mm and larger than 0.074mm) and the coal sample that passed through a 0....

Embodiment 3

[0057] Take Huolinhe lignite with a total water content of 32.9%, a low calorific value of 3216kCal / kg, an ash content of 14.6%, and a particle size of less than 6mm, and dry it at a temperature of 105°C for 40 minutes to obtain a water content of 20%. The dried lignite is treated and modified under a nitrogen atmosphere at 300° C., the residence time is controlled at 60 minutes, and naturally cooled to 60° C. to obtain cooled modified coal.

[0058] The cooled modified coal is placed in a coal mill for coal grinding and sample preparation. Use 0.2mm and 0.074mm sieves to sieve the coal samples, and the coal samples that do not pass the 0.2mm sieve (that is, the coal samples with a particle size greater than 0.2mm) are sent to the coal mill again, and the coal samples that pass the 0.2mm sieve but fail to pass the 0.074mm sieve The coal sample (that is, the coal sample with a particle size smaller than 0.2mm and larger than 0.074mm) and the coal sample that passed through a 0....

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Abstract

The invention relates to a method for processing and modifying lignite or long-flame coal to prepare coal-water slurry. The method comprises the following steps: (1) providing lignite or long-flame coal with a particle size less than or equal to 10mm and a water content of 12-20% (2) process and modify the lignite or long-flame coal provided in step (1) under normal pressure and inert gas protection to obtain modified coal, the temperature of the treatment is 250-375 ° C, and the residence time is 45 ~ 90 minutes; and (3) cooling the modified coal obtained in step (2) to below 80°C under the protection of an inert gas, taking out the cooled modified coal and grinding until the particle size is less than or equal to 0.2mm, adding water to prepare CWS. The method provided by the invention has the advantages of moderate investment, energy saving and consumption reduction in operation, and high slurry concentration, and is especially suitable for making lignite or long-flame coal into high-concentration coal-water slurry.

Description

technical field [0001] The invention relates to a technique for producing coal-water slurry from lignite or long-flame coal, in particular to a method for preparing coal-water slurry through treatment and modification of lignite or long-flame coal. Background technique [0002] Lignite and long-flame coal have high reactivity and high gasification efficiency when used as gasification raw materials. However, due to the high internal moisture and high oxygen-carbon ratio of lignite and long-flame coal, it is difficult to make high-concentration coal-water slurry due to their poor slurryability. However, for coal-water slurry gasification, the higher the concentration and quality of the coal-water slurry, the higher the production capacity of the synthesis system, and the lower the specific oxygen consumption and specific coal consumption. Therefore, the economic benefits brought about by the increase of the concentration of the coal-water slurry are very considerable. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32
Inventor 徐胜利姜成旭王立夫周鑫刘阳戚爱芹杨言江孟庆捷陈继军李永昌王文霞孙波涛蔺肖肖张鹏洲
Owner 辽宁大唐国际阜新煤制天然气有限责任公司
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