556 / 2019-01-17 20:19:44

Development of chemical looping oxygen carriers and reactors at Huazhong University of Science & Technology

Chemical looping, oxygen carrier, inter-connected fluidized bed reactor, reaction kinetics, density functional theory

全体主题 > 燃料利用与化学循环技术

With growing concerns on the global warming, there is an urgent need for green, low-cost, and sustainable ways of energy conversion. Holding the merits of inherent CO2 separation and high-efficient energy utilization in fossil fuel conversion, chemical looping technique is emerging as a perfect alternative to conventional fuel conversion processes. In terms of the current development status of chemical looping processes, there are two key issues to be addressed before their successful application to industry scale: one is the synthesis of high-performance and low-cost oxygen carriers, and the other is the design and operation of reliable chemical looping reactors. To date, over 1000 kinds of oxygen carriers have been screened, synthesized and investigated by different research groups worldwide. In the meanwhile, chemical looping reactors with different configuration and different thermal power input have been designed, constructed and operated. The chemical looping related research work conducted at the Huazhong University of Science & Technology (HUST) has undergone a rapid development during the past 10 years, from rational synthesis of oxygen carriers to the operation of chemical looping combustion reactors. In this work, a comprehensive review on the development of oxygen carriers and inter-connected fluidized bed reactors for chemical looping processes at HUST was conducted, mainly includes the following aspects: oxygen carrier screening, optimization and promotion, reaction kinetics of oxygen carrier with gaseous fuels, microcosmic level understanding of the reaction mechanism in chemical looping processes via density functional theory (DFT) calculation, effect of pollutant compounds (like sulfur and chlorides) on the performance of oxygen carriers, continuous operation experience of the 5 kWth and 50 kWth inter-connected fluidized bed reactors, et al. Overall, this review will present the developing route of chemical looping related research at HUST in details. And at the same time, some useful guidance and research experience on chemical looping will be provided to the relevant readers.