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This paper describes the effect of hydrothermal dewatering of lignite on pyrolysis products characterization and dynamic behaviors. The effects of different hydrothermal temperature (200 °C, 250 °C, 300 °C) on pyrolysis products were tested. The pyrolysis of hydrothermal dewatering lignite (300 °C) resulted in the solid yields of up to 77.98 %, and gaseous product by 11.73 % yield. Analysis showed that all the hydrothermal dewatering promoted the solid products yields and the reducing of the gaseous and solid products yields. The chemicals in the pyrolysis gas from lignite with and without hydrothermal dewatering were mainly H 2 , O 2 , N 2 , CH 4 , CO, and CO 2 . The quality of pyrolysis gas of hydrothermal dewatering lignite was obviously higher than that of raw lignite. The effect of hydrothermal dewatering on the characteristics of pyrolysis carbocoal was explored by MIP, and TG analyses. The pore volume for the lignite treated in hydrothermal dewatering processing conditions is in the macropore size region. The gasification reactivity and ignition temperature of pyrolysis carbocoal of hydrothermal dewatering lignite were reduced, respectively. Kinetic parameters were obtained by Coats–Redfern method and used to model the TG curve. The average activation energy was increased with the increase of hydrothermal temperature. The obtained activation energy for first stage (400–500 °C) pyrolysis was comparably higher than that for the second stage (500–600 °C). The experiments results help to understand and predict the pyrolysis behaviors and propose pre-treatment technology for low rank coals.

Pyrolysis Products Characterization and Dynamic Behaviors of Hydrothermally Treated Lignite