| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 106 === In this thesis, heat loss of the system and relationship between the oxygen carries circulation rate and the air flowrate were studied to meet the actual operating conditions for chemical looping process. The moving bed reactor was used in the chemical looping hydrogen production process. Due to the scales of reactor are quite large, the heat transfer effect of the external heater must be reduced as increasing the size of the reactors. Therefore, this study investigated how the heat loss affects the maximum hydrogen yield of the system in different temperature conditions under isothermal and adiabatic simulation.
Under the actual operations of the chemical looping combustion process, the oxygen carrier circulation rate and the air flow are dependent on each other. Hence, the relationship between the oxygen carrier circulation rate and the air flow is developed, and the effects of different inert support ratio of oxygen carrier and operating temperatures are discussed. Leave it at that, the chemical looping combustion process would be maintained at the heat balance condition by raising the air flowrate and the oxygen carrier circulation rate finally. Then, the result of fuel conversion would be analyzed.
In the isothermal simulation, as operated at 750 oC, the chemical looping hydrogen production process would have the maximum hydrogen yield and minimum impact of heat loss. And yet, the system can tolerate the larger heat loss with a smaller decrease of hydrogen yield when operating at the lower temperature in the adiabatic simulation. Because of the influence of the relationship, the inert support ratio of oxygen carrier is directly proportional to the air flow but indirectly proportional to oxygen carrier circulation rate. The results show that the minimum oxygen carrier circulation rate and air flow rate could be found when the fuel reactor inlet temperature is higher. The circulating oxygen carrier changed from the Fe3O4 to the Fe2O3 when the system was operated in 2.89 ~ 2.90 times Rmin. Until there is no Fe3O4 in the outlet of air reactor, the system is stable.
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