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Preparation method of ultrafine coal powder

A technology of fine coal powder and coarse coal powder, which is applied in the field of preparation of ultra-fine coal powder, can solve the problems of sudden rise in temperature of powder coal equipment, inability to work for a long time, heat generation, etc., and achieve the effect of avoiding spontaneous combustion and explosion

Active Publication Date: 2018-12-21
CCTEG CHINA COAL RES INST
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Problems solved by technology

But in the same way, this scheme uses graded collection and separation of ultra-fine coal powder, and the obtained ultra-fine coal powder is not all components, and the use of dry grinding is prone to heat generation, which will cause the temperature of the final coal equipment to rise sharply, and cannot work for a long time, especially deterioration It is difficult to achieve ultra-fine pulverization in a short period of time for coal with a high degree of

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  • Preparation method of ultrafine coal powder
  • Preparation method of ultrafine coal powder
  • Preparation method of ultrafine coal powder

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Embodiment 1

[0039] Such as figure 1 Shown technique, the preparation method of superfine pulverized coal described in the present embodiment, comprises the steps:

[0040] (1) Get the bituminous coal and carry out the coarse crushing for the first time, and crush to the particle diameter of the bituminous coal<3mm, and make coarse coal powder;

[0041] (2) Carry out second fine crushing to the coarse pulverized coal after above-mentioned coarse crushing, till the particle diameter of bituminous coal figure 2 shown;

[0042] (3) Add water and steel balls to the fine coal powder for ball milling and crushing, and control the steel balls. The masses of fine coal powder, steel balls, and water are 40g, 600g, and 80g respectively. The rotational speed of the planetary ball mill is controlled to be 300r / min, and the coal grinding time is 30min to obtain superfine coal powder. The particle size distribution of the ultra-fine coal powder analyzed by the laser particle size analyzer, such as i...

Embodiment 2

[0045] Such as figure 1 Shown technique, the preparation method of superfine pulverized coal described in the present embodiment, comprises the steps:

[0046] (1) Get the bituminous coal and carry out the coarse crushing for the first time, and crush to the particle diameter of the bituminous coal<3mm, and make coarse coal powder;

[0047](2) Carry out second fine crushing to the coarse pulverized coal after above-mentioned coarse crushing, till the particle diameter of bituminous coal Figure 4 shown;

[0048] (3) Add water and steel balls to the fine coal powder for ball milling and crushing, and control the gradation number of medium balls in the steel balls as large balls: medium balls: small balls=1:11:25, and The masses of fine coal powder, steel balls and water are 30g, 450g and 60g respectively, the rotational speed of the planetary ball mill is controlled to 250r / min, and the coal grinding time is 20min to obtain superfine coal powder. The particle size distribution...

Embodiment 3

[0051] Such as figure 1 Shown technique, the preparation method of superfine pulverized coal described in the present embodiment, comprises the steps:

[0052] (1) Get the anthracite and carry out the coarse crushing for the first time, and crush to the particle diameter of bituminous coal<3mm, and make coarse coal powder;

[0053] (2) Carry out second fine crushing to the coarse pulverized coal after above-mentioned coarse crushing, till the particle diameter of bituminous coal Figure 6 shown;

[0054] (3) Add water and steel balls to the fine coal powder for ball milling and crushing, and control the steel balls. The masses of fine coal powder, steel balls and water are 40g, 450g and 40g respectively, the rotational speed of the planetary ball mill is controlled to 200r / min, and the coal grinding time is 45min to obtain superfine coal powder. The particle size distribution of the ultra-fine coal powder analyzed by the laser particle size analyzer, such as Figure 7 shown....

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Abstract

The invention belongs to the technical field of superfine coal powder preparation, and particularly relates to a preparation method of ultrafine coal powder. The preparation method of ultrafine coal powder can obtain a whole-composition particle superfine coal powder with low crude particle content through the combine of the ball milling mode of a ball mill and grading crushing and optimizing thecontrol parameters of all steps of a planetary ball mill, the proportion of the the superfine coal powder fine particles smaller than 10 microns is large, and laboratory research and characterizationrequirements can be met. According to the preparation method of ultrafine coal powder, the coal powder is crushed by adopting a wet method, spontaneous combustion explosion of coal powder and potential safety hazards caused by dry crushing method are effectively avoided, long-time safe crushing operation can be achieved and the relatively uniform superfine coal powder can be obtained, and a corresponding theoretical guidance is provided for the preparation process of ultra-pure coal.

Description

technical field [0001] The invention belongs to the technical field of ultrafine coal powder preparation, and in particular relates to a preparation method of ultrafine coal powder. Background technique [0002] Coal has always been the main energy source in China. The conventional utilization of coal is mainly as primary energy and coal conversion. At present, the most prominent in coal utilization is the preparation of oil-substituting coal-water slurry and coal-based materials. However, whether it is oil-substituting coal-water slurry or high-quality coal-based materials, there are high requirements on coal quality, especially the ash content of coal, so there are certain limitations, and the ultra-pure coal that has attracted widespread attention can completely solve the above problems. [0003] Ultra-pure coal is a high value-added coal product that can be used as a high calorific value fuel to replace diesel and natural gas for internal combustion engines, gas turbines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C17/20
CPCB02C17/20B02C21/00
Inventor 白向飞涂华朱川张宇宏丁华王东升陈亚飞陈洪博杨晓毓
Owner CCTEG CHINA COAL RES INST