Study Of Flow Mass Distribution Characteristic Of Thermal Flow-Reversal Oxidation Device

It is not only a kind of energy waste, but also polluting the atmosphere and intensifying the greenhouse effect if ventilation air methane is emissioned directly because it isdifficult to directly use. Hence, it is of great significance to promote the development ofenergy conservation and emissions reduction and low carbon economy by using thermalreverse flow reactor to reduce the VAM. Therefore, to improve the uniformity oftemperature distribution by studying it’s thermal resistance characteristic and masteringthe influence of various parameters and the relationships between flow distribution andthermal resistance, will has great significance for the device performance optimizationand reliability.First, VAM thermal oxidation calculation model has been built and experimentalverification has been done. S.Zhdanok’s experiment were simulated by using fluentsoftware and porous medium model in this paper, the accuracy of the simulation methodin this paper is verified by contrasting the simulation values to the experimental data.Then, by building three-dimensional model and control equations of thermaloxidation and using porous medium model for the coal mine ventilation air methanethermal reverse flow reactor processing capacity of60000m3/h developed by ShanDongUniversity of Technology， the effects of honeycomb ceramic’s inlet parameters(including inlet gas velocity, inlet methane concentrations, etc.), geometric parameters(including porosity, oxidation bed height, etc.), physical parameters (such as ceramicdensity, specific heat capacity, thermal conductivity, etc.), operating parameters(including heat dissipated power, the initial temperature field, etc.) on temperaturedistribution and resistance loss within the honeycomb ceramic oxidation bed and theunsteady changes of the resistance in every working cycle of the honeycomb ceramicoxidation bed are studied. The results show that: the combustion wave movementvelocity is related to inlet gas velocity, temperature and pressure of the gas; the resistanceloss is related to the size of high temperature area output; what’s more, the unsteadychanges of the resistance depend on whether the heat input is more than the heat.Finally, by building two-dimensional model and control equations of thermaloxidation and using porous medium model for the coal mine ventilation air methanethermal reverse flow reactor processing capacity of60000m3/h developed by ShanDongUniversity of Technology，the unsteady wave characteristics of honeycomb ceramic’stwo-dimensional flow distribution and temperature distribution are studied. The effects of the inlet parameters, geometric parameters, physical parameters and operating parameterson the flux distribution and temperature distribution uniformity inside the oxidation bedare mainly studied. The relationships between flow distribution and thermal resistance areconcluded, which can improve the uniformity of flow distribution and temperaturedistribution inside the oxidation bed, thereby, enhance the oxidation bed life andoperation safety.