Experiment Study Of Coal Mine Ventilation Air Methane Oxidation

Every year,about 130～170 billion m³ methane is emited though the ventilation air of coal mines in our country.The global warming potential(GWP) of methane is 21 times to CO₂.Ventilation air methane(VAM) has the characteristics of low methane concentration and huge volume flow.The conventional method to deal with it is discharging VAM into the atomsphere directly.It is a great damage and has a significant greenhouse effect to the environment.The thesis tries to build up a laboratory device to oxidate the methane and study the thermal nature and laws of it.First of all,the thermal nature like self-ignition temperature and temperature rise of VAM was studied in the thesis.With the capacity of 1000 Nm³/h,the oxidation bed which consists of honeycomb ceramic was calculated and designed too.Based on the calculation results,the laboratory device,which consists of regenerator, direction conversion system,thermal start system,control system,was built up.And then, the cold experiments and thermal nature and laws performance of the device were performed,using the mixture of air and methane as the VAM.Furthermore,some calculation and analysis of the economy investment and income of the demonstration project with the capacity of 100,000 Nm³/h was studied in the paper.According to the research results,the thermal calculation method adopted is efficient and the steady and self-maintenance running of the device can be realized.The economy analysis of the demonstration project also shows that this technology has a significant environmental benefits.And the economic benefits is also very impressive when it is under the support of CDM projects.It is with the national and even global perspective for promotion.