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Coal tar recovery method and system

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

Active Publication Date: 2018-04-13
ENN SCI & TECH DEV
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  • Application Information

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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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  • Coal tar recovery method and system
  • Coal tar recovery method and system

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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 and aims to avoid high water consumption, prevent generation ofa great quantity of tar-containing wastewater and effectively increase tar recovery rate without using expensive scrubbing oil. The method includes: step 1) subjecting coil to gasification or pyrolysis reaction to obtain raw gas and byproduct semi-coke; step 2) adopting an indirect condensation method for condensation of obtained raw gas to recover heavy tar and light tar in the raw gas; step 3) adopting a solid adsorbent for adsorption and desorption of the raw gas subjected to condensation to continue recovery of residual light tar in the raw gas. The coal tar recovery method and the systemare used for recovery of tar generated in coal pyrolysis and gasification.

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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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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