Coal for direct liquefaction and preparation method of coal

A direct, clean coal technology, applied in the preparation of liquid hydrocarbon mixtures, petroleum industry, grain processing, etc., can solve the problems of uneconomical separation, ineffective separation, cumbersome sorting process, etc., and achieve improved coal conversion rate and liquefaction The effect of increasing oil yield, improving effective utilization rate and improving separation efficiency

Active Publication Date: 2014-07-23
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Claims
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AI Technical Summary

Problems solved by technology

Since the particle size of 60wt% to 90wt% of pulverized coal after grinding is -0.074μm, the flotation method will introduce a series of flotation equipment, namely pulping equipment, flotation equipment, dehydration equipment, drying equipment, etc., and the The disadvantage of the method is that because the coal powder particle size is very low, the scale of the equipment is large, the one-time investment is high, and the amount of water used to dehydrate the product is large, and the drying process is time-consuming and laborious. This method is used for fine particle size Separation of coal microcomponents is not economical
And this method does not mention what kind of flotation agent is used. Currently, commercially available flotation agents are used to separate coal and gangue according to the different properties, and no flotation agent that can be used for the separation of coal microcomponents has been developed. Pharmacy, the feasibility of flotation to separate microscopic components is still to be discussed, and the separation process adopted is relatively cumbersome, the investment is high, and the effect obtained is not obvious
Therefore, the separation method of coal for direct coal liquefaction still needs to be improved

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  • Coal for direct liquefaction and preparation method of coal

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preparation example Construction

[0022] In a typical embodiment of the present invention, as figure 1 As shown, a method for preparing coal for direct liquefaction is provided, the preparation method comprising the following steps: crushing the raw coal for the first time to obtain the first crushed coal; sieving the first crushed coal to obtain the sieved The upper material and the undersize material; the first separation of the oversize material to obtain the first clean coal, medium coal and first tailing coal; the second crushing of the medium coal to obtain the second crushed coal; the second crushing After the coal is mixed with the undersize, the second separation is carried out to obtain the second clean coal and the second tailing coal; the first clean coal and the second clean coal are combined to obtain coal powder containing vitrinite and exinite ; Grinding coal powder containing vitrinite and exinite to obtain coal for direct liquefaction.

[0023] By adopting the above scheme of the present inv...

Embodiment 1

[0039] 100kg of raw coal is crushed for the first time with a toothed roller crusher, and the crushing particle size is 3mm to obtain the first crushed coal;

[0040] The first crushed coal is sieved at 0.5mm level, and the sieved material enters the three-product dense medium cyclone for separation, and the separation density is 1.42g / cm -3 Sorting to obtain 50.3kg of the first clean coal, 13.1kg of the first tailing coal and 30.8kg of medium coal;

[0041] The 30.8kg middling coal separated by the dense medium cyclone is crushed for the second time, and the crushing particle size is 0.5mm to obtain the second crushed coal;

[0042] Mix the second crushed coal with the undersize and enter the small-diameter dense medium cyclone for separation. The separation density is 1.47g / cm -3 , to obtain 23.6kg of second clean coal and 5.9kg of second tailing coal;

[0043] Combine the first clean coal and the second clean coal obtained by the two kinds of gravity separation equipment ...

Embodiment 2

[0045] 100kg of raw coal is crushed for the first time with a drum crusher, and the crushing particle size is 50mm to obtain the first crushed coal;

[0046] The first crushed coal is sieved at 0.5mm level, and the sieved material enters the three-product dense medium cyclone for separation, and the separation density is 1.3g / cm -3 Sorting to obtain 23.7kg of the first clean coal, 16.8kg of the first tailing coal and 58.7kg of medium coal;

[0047] The 58.7kg medium coal obtained from the separation of the dense medium cyclone is crushed for the second time, and the crushed particle size is 0.5mm to obtain the second crushed coal;

[0048] Mix the second crushed coal with the undersize and enter the small-diameter dense medium cyclone for separation. The separation density is 1.35g / cm -3 , to obtain 47.9kg of second clean coal and 10.3kg of second tailing coal;

[0049] Combine the first clean coal and the second clean coal obtained by the two kinds of gravity separation equ...

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Abstract

The invention discloses coal for direct liquefaction and a preparation method of the coal. The preparation method comprises the following steps: carrying out first breaking on raw material coal to obtain first broken coal; screening the first broken coal to obtain an oversize material and an undersize material; carrying out first sorting on the oversize material to obtain first clean coal, middling coal and first tail coal; carrying out second breaking on the middling coat to obtain second broken coal; mixing the second broken coal with the undersize material and carrying out second sorting on the mixture to obtain second clean coal and second tail coal; combining the first clean coal with the second clean coal to obtain coal powder containing vitrinite and exinite; grinding the coal powder containing the vitrinite and the exinite to obtain the coal for direct liquefaction. According to the preparation method disclosed by the invention, the raw material coal is broken, preliminarily screened according to the breaking particle size and further sorted twice according to the density difference of different coal macerals, so that the effective separation of high-activity components and high-inertness components in the coal is realized.

Description

technical field [0001] The invention relates to the technical field of direct liquefaction of coal, in particular to a coal for direct liquefaction and a preparation method thereof. Background technique [0002] Direct coal liquefaction has relatively high requirements on coal types. In the coal liquefaction process, the coal quality is divided into active components and inert components. It is generally believed that the vitrinite and exinite in the organic microscopic components of coal are liquefied. The active components all participate in the hydrogenation liquefaction in the direct liquefaction process, while the inert components are the inert components of the liquefaction, and only a small part participates in the conversion. [0003] Among the three major microcomponents of coal rocks, vitrinite and inertinite are the two main microcomponents in coal rocks, and the content of exinite is generally low. If the inert components in the raw coal can be separated from th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C23/08C10L5/00C10G1/00
Inventor 李导王洪学李克健章序文
Owner CHNA ENERGY INVESTMENT CORP LTD
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