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Investigation into the Reactivity of Calcium Sulfate with Gaseous and Solid Fuels and Thermodynamic Analysis of Carbon Deposits and Sulfur Evolution in Chemical-Looping Combustion System

H. Tian(1*), Q. Guo(2)

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Abstract


The pollution of environment and the changes of climate are caused directly by the CO2 emission in combustion process of coal. Chemical looping combustion could easily concentrate CO2 in combustion processes by efficient and energy-saving ways. A new compound oxygen carrier with calcium sulfate and metal oxides is prepared by impregnation method in this paper. The reaction in thermal gravimetric analyzer between the compound oxygen carrier and some gaseous fuels such as CO and some solid fuels such as coal char is investigated. The reaction rate between the compound oxygen carrier impregnated with trace Fe2O3 and NiO and solid fuels is much faster than that between CaSO4 oxygen carrier and solid fuels. Fe2O3 addition improves the reaction performance of oxygen carrier with solid fuels more than NiO. Furthermore, different influencing factors, including pressure, fuel reactor temperature, and oxygen excess number, on the formation of carbon deposits and sulfur evolution are investigated. It can be predicted that the temperatures in the range from 900 to 1050 °C, the pressure form 1 to 5 bar and the excess oxygen number from 0.9 to 1.1 can be regarded as the optimum operation conditions.
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Keywords


Chemical-Looping Combustion; Compound Oxygen Carrier; Carbon Deposits; Impregnation Method; Sulfur Evolution

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References


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