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A preparation method of optimized gradation, low energy consumption and high concentration of coal-water slurry

A high-concentration water and coal-water slurry technology, applied in liquid carbon-containing fuels, petroleum industry, fuels, etc., can solve the problems of high energy consumption of grinding equipment, limited concentration of coal-water slurry, complex process, etc., and achieve good energy-saving effect, The effect of widening pulping coal types and simple pulping process

Active Publication Date: 2019-08-16
NANJING UNIV +1
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  • Application Information

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Problems solved by technology

[0003] Chinese patent application CN201610925779.7 proposes a high-concentration coal-water slurry and a method for preparing high-concentration coal-water slurry by efficient classification. This method can improve the accumulation efficiency of coal particles in the coal slurry and optimize the particle size distribution of the coal slurry. Compared with the rod / ball mill coal-water slurry preparation process, the concentration can be increased by 4-6%, but this process is severely restricted by coal types, and the process is complicated, so it cannot solve the existing problems
However, this process is limited in increasing the concentration of coal-water slurry, and the process is complicated and energy-consuming
[0005] Chinese patent application CN201610480018.5 proposes a novel method for preparing high-concentration coal-water slurry, which combines kneading, shaping, sieving and shearing with ultra-fine grinding and shaping fine grinding, so that The particle size distribution of the prepared coal-water slurry is reasonable, effectively fills the gaps between the coal powder, improves the slurry concentration, and the concentration can be increased by 3-5%. The method can effectively widen the particle size distribution of the coal-water slurry and improve the water Coal slurry concentration, but excessive use of grinding equipment consumes too much energy

Method used

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  • A preparation method of optimized gradation, low energy consumption and high concentration of coal-water slurry
  • A preparation method of optimized gradation, low energy consumption and high concentration of coal-water slurry
  • A preparation method of optimized gradation, low energy consumption and high concentration of coal-water slurry

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Effect test

Embodiment 1

[0025] (1) Coarse powder accounts for 50 parts, fine powder accounts for 50 parts, and naphthalene-based dispersant accounts for 0.4 part in the dry basis mass fraction of the prepared coal-water slurry;

[0026] (2) The coal is crushed by the crocodile crusher and then passed through a 14-mesh sieve to obtain a coarse powder, and a fine slurry is obtained by an intermittent small ball mill, and the dried 75g Wangjiata coal coarse powder is slowly added to 175g and stirred A slurry with a wide particle size distribution (concentration of 42.3%, average particle size of 29.3 μm, 60 mesh, and 200 mesh passing rates of 99.8% and 92.3%, respectively) was obtained from the ultrafine slurry in the slurry. Slowly add the coarse powder of 83g Dongbo coal after drying into the superfine slurry in 167g stirring to make a slurry with wide particle size distribution (concentration is 49.5%, average particle diameter 28.2μm, 60 mesh, 200 mesh through 99.9% and 93.5% respectively), analyze ...

Embodiment 2

[0032] (1) Coarse powder accounts for 60 parts, fine powder accounts for 40 parts, and aliphatic dispersant accounts for 0.2 part in the dry mass fraction of the prepared coal-water slurry;

[0033] (2) The coal is crushed by a crocodile crusher and then passed through a 14-mesh sieve to obtain a coarse powder, and a fine slurry is obtained by an intermittent small ball mill, and the dried 130g of flat coal powder is slowly added to 170g of stirring A slurry with a wide particle size distribution (concentration of 50.0%, average particle size of 27.1 μm, 60 mesh, and 200 mesh passing rates of 99.9% and 94.1%, respectively) was obtained in the ultrafine slurry. Add 33g of water to 147g of ultrafine slurry (concentration is 41%, average particle size 26.9μm, 60 mesh, 200 mesh pass rate 99.8%, 95.8%), and add 90.5g of dried Zhundong coal while stirring Coarse powder was used to prepare a slurry with a wide particle size distribution. The viscosity, concentration and stability of ...

Embodiment 3

[0041] (1) Coarse powder accounts for 70 parts, fine powder accounts for 30 parts, and lignin dispersant accounts for 3 ‰ in the mass fraction of dry basis of the prepared coal-water slurry;

[0042](2) After the coal is crushed by the crocodile crusher, the coarse powder is obtained through a 14-mesh sieve, and a fine slurry is obtained by intermittent small-scale vibration grinding, and the coarse powder of 145g Erlin Rabbit Coal after drying is slowly added to the A slurry of wide particle size distribution (40.0% concentration, 26.8 μm average particle diameter, 99.9% and 94.8% passing rates of 60 mesh and 200 mesh respectively) was prepared in 155 g of stirring ultrafine slurry. Add 31g of water to 126g of ultra-fine slurry with a concentration of 40.2%, average particle size of 24.8μm, 60 mesh, and 200 mesh pass rates of 99.9% and 96.8%, respectively, and add 118g of dried Zhundong coal powder while stirring A slurry with a broad particle size distribution was produced. ...

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Abstract

The invention discloses a preparation method for coal water slurry with optimizing gradation, low energy consumption and high concentration. The preparation method includes the steps that (1) coarse powder and fine powder are prepared, wherein the coarse powder is prepared from breaking coal through a crusher and sieving through a sieve of 14 mesh; coal water slurry with a concentration of 40-60% is produced by a ball milling machine, and the coal water slurry with the average grain diameter of less than 30 micrometers is used as the fine powder; (2) the coarse powder and fine powder prepared by the step (1) are mixed according to the dry base ratio of 1-3:1 to form the mixture, and by adding water and coal slurry additives to the mixture, the coal water slurry with a viscosity of 500-1500 mPa.S is prepared. The preparation method can greatly improve the concentration of the coal water slurry, and meet the requirements of the gasification slurry preparation, and meanwhile, the preparation of the coarse particles which directly adopts the crushing process with high efficiency, has a good effect of energy saving. The preparation method has the advantages that the slurry preparation process is simple; the energy consumption is low; coal kinds for slurry preparation are widened, and the coal water slurry concentration is remarkably improved; the preparation method has a good industrial application prospect.

Description

technical field [0001] The invention relates to a method for preparing coal-water slurry with optimized gradation, low energy consumption and high concentration. Background technique [0002] Coal chemical industry is a technology to improve the conversion and clean utilization of coal. The core of this technology is the preparation of synthetic gas through coal gasification. The technology began in the 1930s. After nearly 100 years of development, it mainly adopts high thermal efficiency and single furnace capacity. The United States Texaco coal-water slurry gasifier (TEXCO) and the British Shell pulverized coal gasifier (SHELL) with large, high conversion efficiency and less pollution, China has also developed a coal-water slurry multi-nozzle gasifier and aerospace powder Coal gasifier. Texaco coal gasification is a pressurized coal water slurry gasification technology. Its process is to first make coal water slurry and pump it into the gasification furnace, and then use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32C10L1/16
CPCC10L1/16C10L1/1625C10L1/326
Inventor 胡柏星何其慧许仁富田万成
Owner NANJING UNIV
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