中文摘要：

提出基于CaSO4载氧体的串行流化床煤化学链燃烧分离CO2技术，分析了燃料反应器内水煤气反应、CaSO4以及金属氧化物载氧体还原反应热力学特性参数，表明CaSO4是煤化学链燃烧反应理想的载氧体。应用Aspen Plus软件，建立了基于CaSO4煤化学链燃烧串行流化床内各种物质的质量平衡、化学平衡和能量平衡模型，进行模拟研究：结果表明，随着燃料反应器温度不断提高，燃料反应器气体产物中H2O体积浓度基本维持不变，CO2浓度略有降低，CO迅速上升，而H2缓慢增大；H2S随反应温度呈幂指数规律衰减，SO2显著递增，表明燃料反应器产物中SO2和H2S中的硫不全部是煤中硫，部分硫来自于CaSO4载氧体竞争反应的产物；载氧体循环倍率随燃料反应器温度升高呈幂指数级增加，随空气反应器温度呈幂指数级递减。

英文摘要：

Chemical looping combustion of coal with the use of CaSO4 as an oxygen carder was presented. Coal and steam were introduced to the fuel reactor that contains CaSO4 particles. The coal gasification and the reduction of CaSO4 with the syngas took place simultaneously in the fuel reactor, producing carbon dioxide and water. The products of CO2 and steam were kept separate frofn the rest of the flue gas. After condensation of the steam almost pure CO2 was obtained. The reduced oxygen carder （CaS） was then transported to the air reactor, where it was oxidized with air back to its original form before it was returned to the fuel reactor. In this way CaSO4 was used as a chemical looping oxygen carrier. The thermodynamics of CO-CaSO4 and H2-CaSO4 parallel reactions were discussed to investigate the possibility of reactions in the fuel reactor. Simulation on the processes of coal gasification, and reduction of CaSO4 oxygen carrier was carded out with Aspen Plus software. With an increase of the fuel reactor temperature, the H2O content in the flue gas from the fuel reactor kept almost constant and CO2 decreased appreciably, while CO increased rapidly. Sulfur contained in coal was converted to SO2 and H2S in the fuel reactor. The recirculation of CaSO4 oxygen carder particles increased linearly with the ratio of water to coal, and decreased exponentially with the air reactor temperature. It is recommended that the air reactor and fuel reactor operate at about 1100℃, 900-950℃, respectively.