Effects of atmosphere and post catalyst on pyrolysis characteristics of Pingshuo bituminous coal

Huaixiang Li ,Mengxiang Fang ,Tong Lv ,Jiqing Yan ,Zhixiang Xia ,Jianmeng Cen

doi:10.24294/tse.v4i2.1514

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Effects of atmosphere and post catalyst on pyrolysis characteristics of Pingshuo bituminous coal

Huaixiang Li

Mengxiang Fang

Tong Lv

Jiqing Yan

Zhixiang Xia

Jianmeng Cen

Thermal Science and Engineering 2021, 4(2), 1-10; https://doi.org/10.24294/tse.v4i2.1514

Submitted：30 Apr 2021

Accepted：29 Jun 2021

Published：12 Jul 2021

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Abstract

In order to lighten the tar from coal pyrolysis, the effects of N₂, CH₄ and H₂ atmosphere on the pyrolysis characteristics of Pingshuo bituminous coal were investigated in a small fluidized bed, and Ni-based catalyst was placed downstream of coal pyrolysis to catalyze the upgrading of tar. The results show that both H₂ and CH₄ atmosphere can improve the conversion of coal pyrolysis and improve the yield of pyrolysis tar. Compared with CH₄ atmosphere, the post placed Ni-based catalyst in CH₄ atmosphere can increase the tar

yield by 10%, increase the gas yield and H₂ yield, and transform the pyrolysis tar to the light direction. Through simulated distillation and GC-MS analysis, compared with N₂ atmosphere, CH₄, H₂ atmosphere and CH₄ + Ni increased the relative contents of naphtha, phenol oil, naphthalene oil, wash oil and anthracene oil, and the increase showed that CH₄ + Ni > H₂ > CH₄, while the asphalt content decreased. Compared with CH₄, the relative contents of aromatic hydrocarbons and aliphatic hydrocarbons increased significantly under CH₄ + Ni.

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References

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