Industrial-Scale Experimental Study on the Thermal Oxidation of Ventilation Air Methane and the Heat Recovery in a Multibed Thermal Flow-Reversal Reactor

In the present work, an industrial-scale experiment on ventilation air methane (VAM) utilization by a multibed thermal flow-reversal reactor (TFRR) is conducted in China. The influence of the inlet flow rate, feed methane concentration, and cycle time on the temperature distribution of the bed and heat recovery efficiency are investigated. The methane conversion in the studied cases exceeds 97%. The results show that the methane concentration during self-maintained operation of the TFRR without heat recovery should not be less than 0.22 vol % when the inlet flow rate is 103,000 Nm 3 /h and the cycle time is 300 s. As the inlet flow rate decreases, the lower concentration limit of automatic thermal maintenance increases. The peak temperature of the bed approaches the inlet side as the feed methane concentration increases and the cycle time decreases. The heat recovery efficiency increases linearly with increasing inlet flow rate, rises parabolically with an increasing feed methane concentration, and decreases weakly with increasing cycle time.

[2]  M. Jaschik,et al.  Thermal combustion of lean methane–air mixtures: Flow reversal research and demonstration reactor model and its validation , 2012 .

[3]  You-Rong Li,et al.  Numerical simulation of thermodynamic performance in a honeycomb ceramic channel , 2016 .

[4]  Baiquan Lin,et al.  Demonstration and its validation for ventilation air methane (VAM) thermal oxidation and energy recovery project , 2015 .

[5]  Shengfu Ji,et al.  Simulation of Catalytic Combustion of Methane in a Monolith Honeycomb Reactor , 2006 .

[6]  Xiong Yang,et al.  Vacuum Exhaust Process in Pilot-Scale Vacuum Pressure Swing Adsorption for Coal Mine Ventilation Air Methane Enrichment , 2018 .

[7]  M. Jaschik,et al.  A study on thermal combustion of lean methane–air mixtures: Simplified reaction mechanism and kinetic equations , 2009 .

[8]  K. Gosiewski.  Efficiency of heat recovery versus maximum catalyst temperature in a reverse-flow combustion of methane , 2005 .

[9]  Defu Che,et al.  Catalytic Combustion of Ventilation Air Methane in a Reverse-Flow Reactor , 2010 .

[10]  Krzysztof Gosiewski,et al.  Catalytic or thermal reversed flow combustion of coal mine ventilation air methane: What is better choice and when? , 2014 .

[11]  Hua Guo,et al.  An assessment of mine methane mitigation and utilisation technologies , 2005 .

[12]  Ruixiang Liu,et al.  Modeling Thermal Oxidation of Coal Mine Methane in a Non-Catalytic Reverse-Flow Reactor , 2014 .

[13]  Javier Fernández,et al.  Combustion of coal mine ventilation air methane in a regenerative combustor with integrated adsorption: Reactor design and optimization , 2016 .

[14]  Krzysztof Gosiewski,et al.  Homogeneous vs. catalytic combustion of lean methane—air mixtures in reverse-flow reactors , 2008 .

[15]  Evanthia A. Nanaki,et al.  New Aspects to Greenhouse Gas Mitigation Policies for Low Carbon Cities , 2016 .

[16]  Shudong Wang,et al.  Steady and Transient Characteristics of Catalytic Flow Reverse Reactor Integrated with Central Heat Exchanger , 2014 .

[17]  G. Aydin,et al.  Mine ventilation air methane as a sustainable energy source , 2011 .

[18]  Sheng Xue,et al.  Characteristics of coal mine ventilation air flows. , 2008, Journal of environmental management.

[19]  C. Özgen Karacan,et al.  Coal mine methane: A review of capture and utilization practices with benefits to mining safety and to greenhouse gas reduction , 2011 .

[20]  Zhenhua Li,et al.  Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions , 2018 .

[21]  Pablo Marín,et al.  Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation , 2010 .

[22]  Krzysztof Gosiewski,et al.  Energy recovery from ventilation air methane via reverse-flow reactors , 2015 .

[23]  Pablo Marín,et al.  Procedures for heat recovery in the catalytic combustion of lean methane―air mixtures in a reverse flow reactor , 2009 .

[24]  J. Ran,et al.  Experiment and modeling of low-concentration methane catalytic combustion in a fluidized bed reactor , 2016 .

[25]  Krzysztof Gosiewski,et al.  Combustion of lean methane–air mixtures in monolith beds: Kinetic studies in low and high temperatures , 2015 .