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Effect of coalbed methane airflow with optimum action concentration on coal oxidation under low temperatures
Author(s) -
Xu Qin,
Yang Shengqiang,
Yang Wenming,
Tang Zongqing,
Song Wanxin,
Zhou Buzhuang,
Yang Kai
Publication year - 2020
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2577
Subject(s) - coal , chemistry , oxidizing agent , airflow , coalbed methane , fourier transform infrared spectroscopy , methane , reactivity (psychology) , oxygen , radical , analytical chemistry (journal) , inorganic chemistry , chemical engineering , environmental chemistry , coal mining , organic chemistry , thermodynamics , physics , engineering , medicine , alternative medicine , pathology
To explore the effect of coalbed methane (CBM) airflow on coal oxidation under low temperatures, an experimental apparatus was developed and applied to simulate coal oxidation under different oxidizing atmospheres. The formation of carbon monoxide CO, the index gas, in CBM airflow was analyzed to obtain the optimum concentration of CH 4 that exerted the strongest influence on coal oxidation. Then, a comparison experiment was performed on coal oxidation in dry air and in CH 4 at the optimum concentration by using electron spin resonance (ESR) and Fourier transform infrared (FTIR) technology. The results suggest that 25% of CH 4 has the strongest effect on coal oxidation at low temperatures. The free radical concentration ( N g ) in coal increases with temperature in both dry air and 25% CH 4 . At this concentration, CH 4 can inhibit the reactivity of coal substantially while raising the excitation temperature. The oxidation of aliphatic hydrocarbons is severely inhibited by 25% CH 4 , which reduces its consumption rate and abates its decrement in the initial phase. Although 25% CH 4 restricts the consumption of –OH and –COOH in oxidation, it promotes the formation of –C–O.