新型煤气化间接燃烧联合循环研究

INVESTIGATION OF A NOVEL GASIFICATION CHEMICAL LOOPINGCOMBUSTION COMBINED CYCLE

以煤为燃料,通过气化和间接燃烧等技术,实现燃煤发电的CO2分离。水煤浆增压后,利用间接燃烧过程热源气化。以金属氧化物为载氧体,实现间接燃烧(CLC),即载氧体与煤气的“燃烧”和载氧体与空气的再生,“燃烧” 气相产物为H2O(汽)+CO2,冷凝水后,可分离出CO2。结合燃气蒸汽联合循环技术,构成新型煤气化间接燃烧联合循环,实现燃煤高效和CO2分离。文中通过数学建模方法,对系统特性进行仿真计算,预测煤气成分,研究载氧体还原比率、循环倍率、煤气成分等参数对间接燃烧性能的影响,为间接燃烧技术的实验研究和系统概念设计提供基础数据。

A novel combined cycle based on gasification and chemical-looping combustion(GCLC-CC) is proposed. The system offers a potential method for coal combustion with CO2 separation. After pressurized, coal slurry enters a pipe-typed gasifier immersed in the CLC air reactor and takes in the heat released from the air reactor. After removal of particulates, the syn-gases are used as the fuel of CLC fuel reactor. The technique involves the use of a metal oxide as an oxygen carrier which transfers oxygen from the combustion air to the fuel, and the direct contact between fuel and combustion air is avoided. The products of combustion, i.e. CO2 and H2O, are kept separate from the rest of the flue gas. After condensation of the water almost pure CO2 is obtained. Combined with the technology of gas turbine and steam turbine, a combined cycle is formed. The components of syn-gases are estimated according to mass equations and reaction equations in this paper. The influence of oxygen carrier reduction ratio, circulation ratio and water/coal ratio on the performance of the CLC reactor, for example, inlet and outlet temperature of air reactor and fuel reactor, the minimum air needed, are discussed. Some useful results are reached and can be used to design the experiment device and for further study.