Ultra-low concentration coal bed methane is difficult to utilize due to its low concentration and fluctuant flow. A laboratory fluidized bed reactor was employed to burn ultra-low concentration coal bed methane. The temperature and pressure characteristics during combustion were studied experimentally. The temperature characteristic and its effect on methane conversion, CO concentration were analyzed. The effects of superficial velocity on pressure variation at different bed height were investigated. And the pressure fluctuation characteristic at different bed height was also studied. The results show that temperature performs uniformly in fluidized bed furnace and temperature differences are very small. The temperatures in bed and on bed surface show small-scope fluctuation. Methane conversion and CO concentration augment with increasing bed temperature. When superficial velocity is added, plenum pressure, bed pressure and freeboard pressure increase. The critical fluidized velocity slightly drops when rises bed temperature. Fluctuation phenomenon exists in fluidized bed, and its scope on the bed surface is greater than that in bed. The average pressure value drops when methane is introduced. The research results provide theoretical supports for coal bed methane further utilization.

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