Demonstration and its validation for ventilation air methane (VAM) thermal oxidation and energy recovery project

摘要

In the present work, a preliminary technical and demonstration running assessment had been conducted in the Dafosi coal mine, China. First commercially available technologies for both mitigation and utilization of coal mine methane (VAM) combined with drained low concentration methane by premixing and co-oxidation was briefly described. Based on the methane emission characteristics, the running properties of thermal flow reversal reactor (TFRR) and gas mixing unit have been analyzed systemically. Under the experimental condition, TFRR should be preheated for about 27 h until the central temperature of monolith bed reaching to about 1000 degrees C. Another 9 h are needed to make the temperature evolutes to the similar profiles under the stable operation conditions with the help of electric heater and fed methane gas oxidation. For the TFRR, about 31.61%-46.82% energy can be recovered and used for electricity generation at the stable running conditions. Methane concentration corresponding to TFRR stable and self-maintained running should not be less than 0.25%. However, the effective and economical operation with heat recovery for electricity generation is possible only for the methane concentrations higher than 0.6%, and recommended at 1.0 vol.% methane concentration. (C) 2015 Elsevier Ltd. All rights reserved.