This work is focused on the performance prediction of pilot scale catalytic reverse flow reactors used for combustion of lean methane-air mixtures. An unsteady one-dimensional heterogeneous model for the reactor was e...This work is focused on the performance prediction of pilot scale catalytic reverse flow reactors used for combustion of lean methane-air mixtures. An unsteady one-dimensional heterogeneous model for the reactor was established to account for the influence of the reactor wall on the heat transfer. Results of the simulation indicate that feed concentration, switch time and compensatory temperature impose important influence on the performance of the reactor. The amount of the heat extracted from the mid-section of the reactor can be optimized via adjusting the parameters mentioned above. At the optimal operating conditions, Le. switching time of 400 s, feed concentration of 1% （by volume）, and insulation layer temperature of 343 K, the axial temperature of the reactor revealed a comparatively symmetrical ＂saddle＂ distribution, indicating a favorable operating status of the catalytic reverse flow reactor.展开更多
The catalytic combustion of low concentration methane was systematically investigated in a pilot scale reverse flow reactor.The influences of cyclic period,the concentration of reactant and the space velocity on the o...The catalytic combustion of low concentration methane was systematically investigated in a pilot scale reverse flow reactor.The influences of cyclic period,the concentration of reactant and the space velocity on the operation performance of reactor were studied.The experimental results showed that,for the reverse flow reactor,cyclic period,the concentration of reactant and the space velocity were three important operation parameters that obviously affected the axial temperature profiles of reactor.It′s possible to maintain autothermal operation with high conversion of methane even though the methane concentration decreased to 0.5%.When the methane concentration was increased up to 0.8%,the highest temperature of catalyst bed was beyond 700 ℃.It suggests that the energy of the hot gas should be recovered and this reactive technology is able to be used in power production with low concentration methane.展开更多
基金Supported by the National High Technology Research and Development Program of China(2006AA030201)
文摘This work is focused on the performance prediction of pilot scale catalytic reverse flow reactors used for combustion of lean methane-air mixtures. An unsteady one-dimensional heterogeneous model for the reactor was established to account for the influence of the reactor wall on the heat transfer. Results of the simulation indicate that feed concentration, switch time and compensatory temperature impose important influence on the performance of the reactor. The amount of the heat extracted from the mid-section of the reactor can be optimized via adjusting the parameters mentioned above. At the optimal operating conditions, Le. switching time of 400 s, feed concentration of 1% （by volume）, and insulation layer temperature of 343 K, the axial temperature of the reactor revealed a comparatively symmetrical ＂saddle＂ distribution, indicating a favorable operating status of the catalytic reverse flow reactor.
文摘The catalytic combustion of low concentration methane was systematically investigated in a pilot scale reverse flow reactor.The influences of cyclic period,the concentration of reactant and the space velocity on the operation performance of reactor were studied.The experimental results showed that,for the reverse flow reactor,cyclic period,the concentration of reactant and the space velocity were three important operation parameters that obviously affected the axial temperature profiles of reactor.It′s possible to maintain autothermal operation with high conversion of methane even though the methane concentration decreased to 0.5%.When the methane concentration was increased up to 0.8%,the highest temperature of catalyst bed was beyond 700 ℃.It suggests that the energy of the hot gas should be recovered and this reactive technology is able to be used in power production with low concentration methane.
