Circular gas heat carrier coal pyrolysis system and pyrolysis method thereof

Abstract

The invention relates to a circular gas heat carrier coal pyrolysis system. The pyrolysis system comprises a drying coal grinding device, a pressure device, a heat exchanger, a pyrolysis / burner, a gas-solid separation device, a tar recovery device, a cryogenic separation device and a change / purifying / synthesis device which are sequentially connected; the gas-solid separation device is also connected with the heat exchanger through a semicoke storage tank; the tar recovery device is also connected with the pyrolysis / burner; the pyrolysis / burner is also connected with an exhaust boiler. According to the circular gas heat carrier coal pyrolysis system and a pyrolysis method thereof, the energy consumption is low, the energy conversion efficiency is high, the environment pollution is less, and the pyrolysis product additional value is high.

Description

technical field [0001] The invention belongs to the technical field of coal pyrolysis, and relates to a circulating gas heat carrier coal pyrolysis system and a pyrolysis method thereof. Background technique [0002] In recent years, the quality-based utilization of coal resources has increasingly become a new trend of technological development in the coal energy industry and has attracted widespread attention. However, the current coal pyrolysis technology always has the following technical problems in the actual use process: (1) energy The conversion efficiency is low; (2) The water vapor content in the pyrolysis gas is high, which leads to high energy consumption and energy loss in the tar recovery stage, and the separation technology is difficult; (3) The energy loss in the wet coke quenching process is large, and it is easy to cause water (4) The content of pyrolysis components is small and the quality is poor, which has a great impact on the economy of the pyrolysis pr...

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Problems solved by technology

[0002] In recent years, the quality-based utilization of coal resources has increasingly become a new trend of technological development in the coal energy industry and has attracted widespread attention. However, the current coal pyrolysis technology always has the following technical problems in the actual use process: (1) energy The conversion efficiency is low; (2) The water vapor content in the pyrolysis gas is high, which leads to high energy consumption and energy loss in the tar recovery stage, and the separation technology is difficult; (3) The energy loss in the wet coke quenching process is large, and it is easy to cause water Pollution and water immersion of semi-coke; (4) The content of pyrolysis components is small and the quality is poor, which has a great impact on the economy of the pyrolysis process

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