关键词: 复合载氧体, 流化床, 化学链气化, 循环反应性, 制备

Abstract: In this test，one kind of Ca-based compound oxygen carrier was prepared by chemical impregnation and further processed by extruding granulation device. The method is characterized by simple operation and high yield，which was suitable for large-scale preparation of oxygen carrier. An investigation into the reduction reactivity between compound oxygen carriers and the coal was carried out in TGA and a fluidized bed，respectively. The reaction rate for the compound oxygen carrier impregnated with nickel nitrate，reacting with coal was much faster than that for fresh CaSO4 oxygen carrier. The reaction between CaAlNi oxygen carrier and coal took place at a lower temperature than that between fresh CaSO4 oxygen carrier and coal. Increasing the immersing amount of Ni ions has no effect on the reaction rate，which shortens the reaction time slightly. Experiment of CaAlNi10 oxygen carrier and coal was carried out in a fluidized bed by ten redox cycles. Further，it showed that NiO was able to capture S which released by CaSO4.The CaAlNi10 oxygen carrier particles were featured by the high reactivity and regeneration rate and excellent cycling stability in the fluidized bed during ten redox cycles. Therefore，the CaAlNi oxygen carrier is appropriate for industrial production.

Key words: compound oxygen carrier, fluidized bed, chemical-looping gasification（CLG）, circular mechanism, preparation