COAL ENGINEERING ›› 2016, Vol. 48 ›› Issue (10): 131-134.doi: 10.11799/ce201610040

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Spontaneous combustion characteristics of lignite upgraded at different temperature after undergoing moisture re-adsorption

  

  • Received:2016-02-22 Revised:2016-04-18 Online:2016-10-10 Published:2016-11-03

Abstract: In order to analyze the difference of spontaneous combustion characteristics between the fresh samples upgraded (SA) from 105oC to 800oC in fixed bed reactor and their samples suffering moisture re-adsorption (SC), the oxygen adsorbed and heating rate is obtained by the oxidation test of temperature programming. The results show that the absorbed oxygen at critical temperature for SC reduced exceeding 60% comparing with SA. But catalytic action of water resulted in that the increase for instantaneous heating rate of SC is more quickly than SA at the acceleration oxidation stage, which means the self-heating for SC is faster. Based on assessment of FCC, the spontaneous combustion tendency for SC upgraded at 200~400oC went distinctly beyond SA. So storing at high moisture environment could counteract the effect that upgrading reduced the spontaneous combustion liability for lignite.

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