Method for improving quality of low-temperature tar during coal pyrolysis

A technology for low-temperature tar and low-temperature coal tar, which is applied in the field of coal pyrolysis, can solve problems such as poor quality and low tar yield, and achieve the effects of convenient operation, improved yield and quality, and simple production process

Inactive Publication Date: 2014-04-30
EAST CHINA UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0004] However, the traditional pyrolysis process generally has problems such as low tar yield and poor quality.
The co-pyrolysis p

Method used

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  • Method for improving quality of low-temperature tar during coal pyrolysis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Raw coal is peat.

[0033] After crushing, sieving and grinding, the pulverized coal and low-temperature coal tar that meet the particle size requirements of 10-1000 μm are mixed according to the mass ratio of 100:1, and then placed on the fixed bed of the pyrolysis reactor for pyrolysis reaction. The reaction temperature is 600 ° C. The residence time is 30min. Centrifugal dehydration can be used for tar dehydration.

[0034] The yield of tar was 1.79% higher than the theoretically calculated value of pyrolysis of the two raw materials alone, and the yield of n-hexane solubles was 2.98% higher than the calculated value.

Embodiment 2

[0036] The raw coal is lignite.

[0037] After crushing, sieving, and grinding, the pulverized coal and low-temperature coal tar that meet the particle size requirements of 10-1000 μm are mixed according to the mass ratio of 100:3, and placed on the fluidized bed of the pyrolysis reactor for pyrolysis reaction. The reaction temperature is 600 ℃, the residence time is 30min. Centrifugal dehydration can be used for tar dehydration.

[0038] The yield of tar is 1.36% higher than the theoretically calculated value of pyrolysis of the two raw materials alone, and the yield of n-hexane solubles is 3.53% higher than the calculated value.

Embodiment 3

[0040] Raw coal is bituminous coal.

[0041] After crushing, sieving, and grinding, the pulverized coal and low-temperature coal tar that meet the particle size requirements of 10-1000 μm are mixed according to the mass ratio of 100:5, and then placed in a pyrolysis reactor for pyrolysis reaction. The reaction temperature is 600 ° C. The time is 30 minutes. Centrifugal dehydration can be used for tar dehydration.

[0042] The yield of tar was 0.91% higher than the theoretically calculated value of pyrolysis of the two raw materials alone, and the yield of n-hexane solubles was 3.64% higher than the calculated value.

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Abstract

The invention provides a method for improving the quality of pyrolysis tar during co-pyrolysis of low-temperature coal tar and coal. According to the novel preparation method, the low-temperature coal tar or the distillation residues of the low-temperature coal tar are added into the feed coal for co-pyrolysis to obtain tar and gaseous hydrocarbon products, wherein the mass ratio of the low-temperature coal tar or the distillation residues of the low-temperature coal tar to the feed coal is (0.5 to 100) to (20 to 100), and the reaction conditions are that the pyrolysis temperature is 400-800 DEG C and the pyrolysis time is 0-90 minutes. Through the method, the yields of the pyrolysis tar and pyrolysis gas are increased, the content of light components with high added values in the pyrolysis tar is greatly increased, and the problems of processing and utilization of heavy pyrolysis tar are solved.

Description

technical field [0001] The invention relates to coal pyrolysis technology, in particular to a coal pyrolysis technology for improving the quality of low-temperature tar. Background technique [0002] Facing the major challenge of my country's energy development, and the current shortage of conventional domestic primary energy supply, especially the heavy reliance on imports of transportation fuels has become a bottleneck restricting my country's economic development, coupled with my country's coal-based energy structure, How to efficiently, cleanly and rationally utilize non-renewable coal resources has become a top priority. The main ways of preparing liquid fuel from coal are: direct liquefaction, indirect liquefaction, pyrolysis, etc. Compared with other coal conversion methods, pyrolysis has the characteristics of simple process, mild conditions, less investment, and low production cost. Especially for middle and low rank coal with low degree of metamorphism, it has inc...

Claims

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Application Information

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IPC IPC(8): C10B57/04C10B53/04
Inventor 张德祥潘铁英高晋生马晓龙王胜春
Owner EAST CHINA UNIV OF SCI & TECH
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