Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (11): 2815-2824.doi: 10.1016/j.cjche.2019.03.032

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

Co-pyrolysis characteristics and interaction route between low-rank coals and Shenhua coal direct liquefaction residue

Kai Li1,2,3,4,5, Xiaoxun Ma1,2,3,4,5, Ruiyu He1,2,3,4,5, Zhenni Li1,2,3,4,5   

  1. 1 School of Chemical Engineering, Northwest University, Xi'an 710069, China;
    2 International Scientific and Technological Cooperation Base of the Ministry of Science and Technology(MOST) for Clean Utilization of Hydrocarbon Resources, Xi'an 710069, China;
    3 Chemical Engineering Research Center of the Ministry of Education(MOE) for Advanced Use Technology of Shanbei Energy, Xi'an 710069, China;
    4 Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi'an 710069, China;
    5 Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, China
  • Received:2019-02-01 Revised:2019-03-25 Online:2019-11-28 Published:2020-01-19
  • Contact: Xiaoxun Ma
  • Supported by:
    Supported by National High-tech Research and Development Program of China (2011AA05A2021), the National Natural Science Foundation of China (21536009), and Science and Technology Plan Projects of Shaanxi Province (2017ZDCXL-GY-10-03).

Abstract: To reasonably utilize the coal direct liquefaction residue (DLR), contrasting research on the co-pyrolysis between different low-rank coals and DLR was investigated using a TGA coupled with an FT-IR spectrophotometer and a fixed-bed reactor. GC-MS, FTIR, and XRD were used to explore the reaction mechanisms of the various co-pyrolysis processes. Based on the TGA results, it was confirmed that the tetrahydrofuran insoluble fraction of DLR helped to catalyze the conversion reaction of lignite. Also, the addition of DLR improved the yield of tar in the fixed-bed, with altering the composition of the tar. Moreover, a kinetic analysis during the co-pyrolysis was conducted using a distributed activation energy model. The co-pyrolysis reactions showed an approximate double-Gaussian distribution.

Key words: Low-rank coal, Coal direct liquefaction residue, Co-pyrolysis, Kinetics