A method and system for recovering coal tar

A recovery method and recovery system technology, applied in the field of coal tar recovery, can solve the problems of poor economy, high cost, poor quality of washing oil, etc.

Active Publication Date: 2020-12-29
ENN SCI & TECH DEV
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Problems solved by technology

[0003] In the traditional coal pyrolysis gasification process, the crude gas is usually directly condensed and oil-washed to recover tar, in which a large amount of water is first contacted with the crude gas to condense the heavy tar with a higher boiling point Down, a large amount of tar-containing wastewater will be produced in this process, and then use the similar compatibility principle to use washing oil to absorb the light tar carried in the crude gas, and then recover the light tar through heating and desorption. The cost of the washing oil used in the process is high, and with the continuous adsorption and thermal desorption treatment, the quality of the washing oil will deteriorate, and fresh washing oil needs to be continuously replenished, so the economy is poor

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  • A method and system for recovering coal tar
  • A method and system for recovering coal tar
  • A method and system for recovering coal tar

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Embodiment

[0084] 1) Under the conditions of temperature 850-1000°C and pressure 5-10MPa, the coal hydrogasification reaction is carried out to generate crude gas and semi-coke as a by-product; among them, it is found through detection that: the semi-coke obtained from the coal hydrogasification reaction Volatile content 3 , specific surface>150m 2 / g; the yield of the tar in the obtained crude gas is >10%, the benzene content in the tar composition is >60%, and the pyrene oil content is >15%.

[0085] 2) The obtained crude gas is subjected to dust removal and heat recovery treatment respectively, and the dust content of the crude gas is reduced to 10mg / m 3 , after the temperature drops to 150-220°C, feed the raw gas into the Figure 4 Indirect condensation is performed in the shown indirect condensing device 2, and the tars condensed by the first condensing device 21 and the second condensing device 22 are respectively collected. Among them, it is found through detection that the tetra...

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Abstract

The invention relates to the technical field of coal pyrolysis and gasification, in particular to a coal tar recovery method and system. A large amount of water can be avoided, a large amount of waste water containing tar can be prevented, and at the same time, the recovery rate of tar can be effectively improved by avoiding the use of expensive washing oil. An embodiment of the present invention provides a method for recovering coal tar, comprising: step 1) performing gasification or pyrolysis on coal to obtain crude gas and by-product semi-coke; Condensation, to reclaim the heavy tar and light tar in the crude gas; Step 3) adopt solid adsorbent to carry out adsorption and desorption treatment to the condensed crude gas, to continue to the residual light tar in the crude gas High quality tar is recovered. The embodiment of the present invention is used for the recovery of coal pyrolysis gasification tar.

Description

technical field [0001] The invention relates to the technical field of coal pyrolysis and gasification, in particular to a coal tar recovery method and system. Background technique [0002] Coal pyrolysis gasification technology refers to the technology in which coal and gasification agent react to generate crude gas and solid materials under certain temperature and pressure conditions. [0003] In the traditional coal pyrolysis gasification process, the crude gas is usually directly condensed and oil-washed to recover tar, in which a large amount of water is first contacted with the crude gas to condense the heavy tar with a higher boiling point Down, a large amount of tar-containing wastewater will be produced in this process, and then use the similar compatibility principle to use washing oil to absorb the light tar carried in the crude gas, and then recover the light tar through heating and desorption. The cost of the washing oil used in the process is high, and with th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C1/00C10K1/04
CPCC10C1/00C10K1/04
Inventor 郑征周三刘泽龙董婵
Owner ENN SCI & TECH DEV
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