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High-concentration coal-water slurry and method for preparing high-concentration coal-water slurry by high-efficiency grading particle control

A high-concentration water and coal slurry technology is applied in the petroleum industry, liquid carbon-containing fuels, and fuels. It can solve the problems of small increase in coal slurry concentration, poor operability, and complicated processes, and achieve long-term safety and continuity. , Reasonable gradation and simple process

Active Publication Date: 2018-05-18
CCTEG CLEAN ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the highest concentration of the coal-water slurry can only reach 60wt%, and its preparation method only uses grinding, which consumes a lot of energy
[0006] However, most of the existing coal-water slurry production methods have problems such as small increase in coal slurry concentration, complicated process, poor operability, and high energy consumption.

Method used

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  • High-concentration coal-water slurry and method for preparing high-concentration coal-water slurry by high-efficiency grading particle control
  • High-concentration coal-water slurry and method for preparing high-concentration coal-water slurry by high-efficiency grading particle control

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preparation example Construction

[0055] figure 1 It is the preparation method of the first high-concentration coal-water slurry provided by an embodiment of the present invention, and the preparation method comprises the following steps:

[0056] (1) The raw coal is subjected to high-fine crushing to a particle size of ≤3.0mm, which is the first material;

[0057] (2) Grading and screening: the first material is screened, the particle size of the undersize is ≤2.0mm, the oversize is returned to step (1) for high-fine crushing, the undersize is coarse coal powder, and the coarse coal powder The mass percentage of pulverized coal with a particle size of ≤75 μm in the amount of coarse pulverized coal is 0-30wt%;

[0058] (3) Shaping and particle control: 10-100wt% coarse coal powder is subjected to wet or dry grinding and shaping together with optional water and additives to obtain fine particle coal slurry or fine particle coal powder, fine particle coal slurry Or the particle size of fine coal powder indepen...

Embodiment 1

[0065] The raw coal used in this embodiment is taken from the Yulin area of ​​Shaanxi Province. Its total water is 13.11%, analytical water is 3.70%, air-drying base ash content is 13.98%, air-drying base volatile content is 33.00%, and air-drying base fixed carbon is 55.08%. The grindability index is 52, and the low heating value on the basis of as received is 23.9MJ / kg.

[0066] The method of preparing coal slurry by traditional single rod / ball mill pulping process is as follows:

[0067] (1) Put the raw coal into the crusher and crush it to ≤6.0mm;

[0068] (2) Add the crushed coal powder, water and additives to a rod / ball mill for grinding. After grinding for a certain period of time, when the particle size of the coal slurry meets the following particle size distribution, take out the coal slurry.

[0069] <2400μm

<1400μm

<420μm

<75μm

<45μm

98-100wt%

95-99wt%

90-95wt%

35-45wt%

25-35wt%

[0070]Under the traditional si...

Embodiment 2

[0078] The raw coal used in this embodiment is taken from the Ordos area of ​​Inner Mongolia. Its total water is 17.32%, analytical water is 5.40%, air-drying base ash content is 7.84%, air-drying base volatile content is 30.38%, and air-drying base fixed carbon is 57.34%. The grindability index is 62, and the low calorific value on the basis of as received is 23.44MJ / kg.

[0079] The method of preparing coal slurry by traditional single rod / ball mill pulping process is as follows:

[0080] (1) Put the raw coal into the crusher and crush it to ≤6.0mm;

[0081] (2) Add the crushed coal powder, water and additives to a rod / ball mill for grinding. After grinding for a certain period of time, when the particle size of the coal slurry satisfies the following particle size distribution, take out the coal slurry.

[0082] <2400μm

<1400μm

<420μm

<75μm

<45μm

98-100wt%

95-99wt%

90-95wt%

35-45wt%

25-35wt%

[0083] Under the tradition...

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Abstract

The invention provides high-concentration coal water slurry and a method for efficient classified grain control preparation of the high-concentration coal water slurry. Components of the high-concentration coal water slurry comprise coarse-grained coal powder, fine-grained coal slurry or fine-grained coal powder, an additive or water, and the concentration of the coal water slurry is 50 to 75 weight percent, wherein the mass ratio of the dry basis content of the coarse-grained coal powder, the dry basis content of the fine-grained coal slurry or the fine-grained coal powder and the additive is (0-90):(10-100):(0.1-1.0). The high-concentration coal water slurry is reasonable in grain size distribution and high in coal slurry concentration, flowability, stability and atomization performance. By the preparation method, the accumulation efficiency of the coal slurry can be improved, grain size distribution of the coal slurry can be optimized, and compared with a conventional single-rod / ball mill water coal slurry preparation process, the method has the advantage that the concentration can be increased by 4-6 percent or above; the flow is simple, extremely high in operability and extremely low in energy consumption, and long-term safe and continuous production requirements can be met; the prepared coal slurry can meet requirements on gasifying water coal slurry and combustion coal water slurry.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry preparation, and relates to a high-concentration coal-water slurry and a preparation method thereof, in particular to a high-concentration coal-water slurry and a method for preparing high-concentration coal-water slurry through high-efficiency grading particle control. Background technique [0002] Coal water slurry is made by mixing coal powder, water and additives with a certain particle size distribution in a certain proportion. It has good stability, fluidity and atomization performance, safe storage, convenient transportation and measurement, and can be transported over long distances. . According to the purpose, coal water slurry can be divided into fuel coal water slurry and gasification coal water slurry. Fuel coal water slurry is mainly used in industrial boilers, kilns and power station boilers, burning instead of coal and oil, and gasification coal water slurry Mainly used i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/32
CPCC10L1/326
Inventor 何国锋段清兵吕向阳张胜局王冉柳金秋
Owner CCTEG CLEAN ENERGY CO LTD
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