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A kind of coal-water slurry adopting discontinuous particle size distribution and its preparation method

A coal-water slurry and particle size grading technology, which is used in liquid carbon-containing fuels, petroleum industry, fuels, etc., can solve the problem that the particle size grading has not been effectively controlled, it is difficult to meet the needs of the development of the coal-water slurry industry, and the concentration of the coal-water slurry can be improved. The limited range and other problems can achieve the effects of strong safety and operability, simple preparation method and improved stacking efficiency.

Active Publication Date: 2020-12-29
CHINA COAL RES INST CCRI ENERGY SAVING TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology is to supplement the fine particles with an average particle size of 20 μm in the finished coal-water slurry, and the particle size distribution has not been effectively controlled, and only a small increase in the particle size range of <45 μm. The increase in the concentration of the coal-water slurry is limited, which is difficult to meet The needs of coal water slurry industry development

Method used

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  • A kind of coal-water slurry adopting discontinuous particle size distribution and its preparation method
  • A kind of coal-water slurry adopting discontinuous particle size distribution and its preparation method

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Effect test

Embodiment 1

[0036] Embodiment 1, adopt the preparation of the high-concentration coal-water slurry of discontinuous particle size distribution

[0037] The raw coal used in this embodiment is Shenhua extra low ash coal: Shenhua 1# coal=1:1 coal blending (hereinafter referred to as "Shenhua coal"), its full water M t =16%, received base ash A ar = 9%, received base volatile V ar = 23%.

[0038] according to figure 2 Shown preparation process, utilize this raw material coal to prepare the process of high-concentration coal-water slurry as follows:

[0039] (1) The Shenhua coal is crushed to coal powder with a particle size of ≤30mm.

[0040] (2) Coal powder ≤ 30mm is mixed with process water and additives (lignin sulfonate) for rough grinding to obtain coal slurry A with a concentration of 50wt%. Coal slurry A enters a spiral classifier for separation and selects a critical particle size d pc = 0.2mm, to obtain a concentration of 60wt% coal slurry B and a concentration of 25wt% coal ...

Embodiment 2

[0046] Embodiment 2, the preparation of the high-concentration coal-water slurry that adopts discontinuous particle size distribution

[0047] The raw coal used in this embodiment is Xinjiang Hongshan coal (hereinafter referred to as "Hongshan coal"), and its full water M t = 24%, A ar = 14%, V ar = 30%.

[0048] (1) Crushing Hongshan coal to coal powder with particle size ≤ 30mm.

[0049](2) Coal powder ≤ 30mm is mixed with process water and additives (complex of naphthalene sulfonate formaldehyde condensate and lignin sulfonate) for rough grinding to obtain a concentration of 45wt% coal slurry A, coal slurry A enters the classifier for separation, select the critical particle size d pc = 0.15mm, to obtain a concentration of 55wt% coal slurry B and a concentration of 32wt% coal slurry C, wherein the coal particle size of coal slurry B is 0.15mm ~ 2.5mm, and the coal particle size of coal slurry C is 0 ~ 0.15mm.

[0050] (3) Coal slurry B composed of coal powder with a p...

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Abstract

The invention discloses coal water slurry with discontinuous grain size distribution and a preparation method thereof. The coal water slurry is composed of coal powder, an additive and water, whereinthe coal powder consists of coal powder A from critical granular size to 2.5 mm and coal powder B being less than 0.045 mm in granular size, the critical granular size being 0.09-0.3 mm. In the method, by combination of coarse grinding of raw coal and coal powder separation, control on the grain size distribution in the coal water slurry is achieved, and stacking efficiency of coal granules is greatly increased, and coal slurry concentration can be increased respectively by 5% and 2% than first-generation and second-generation slurry making technologies. The method is a wet-process in total and is great in safety and operability. The preparation method is simple and is a continuous production process, and can satisfy the demand of continuous and stable production in coal water slurry preparation and coal chemical enterprises.

Description

technical field [0001] The invention relates to a coal water slurry adopting discontinuous particle size gradation and a preparation method thereof, belonging to the technical field of coal water slurry. Background technique [0002] Coal water slurry is a coal-based fluid fuel and gasification raw material composed of coal, water and additives. It can be used for combustion power generation or gas supply of industrial boilers, kilns and power plant boilers, and can also be used for coal gasification to produce synthetic ammonia, methanol, olefins, oil, etc. chemicals and natural gas. According to incomplete statistics, by the end of 2017, the consumption of fuel coal-water slurry in my country has reached 30 million tons per year, and the consumption of gasified coal-water slurry has exceeded 200 million tons per year. With the large-scale promotion and application of fuel and gasified coal-water slurry, many problems caused by low concentration of coal-water slurry have g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32C10L1/24
CPCC10L1/2437C10L1/326
Inventor 李发林王国房尚庆雨苏鑫王建军蔡洪涛何红兴张静张桂玲杜丽伟边岳
Owner CHINA COAL RES INST CCRI ENERGY SAVING TECH CO LTD