石炭ガス化燃料中のアンモニア除去に関する研究

概要

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In integrated coal gasification combined cycle power generation (IGCC) systems, ammonia in the gasified fuel is passed through a hot/dry gas cleanup facility into the gas turbine. The ammonia is converted to nitrogen oxides in the combustion process in the gas turbine. Therefore ammonia removal from coal-gasified fuel would effectively reduce NO_x emissions in IGCC systems. We're defined the optimum NO/NH_3 ratio, the optimum concentration of added O_2 and the influence of CO and H_2 in the coal-gasified fuel on NH_3 decomposition and NO reduction by experiments using a tubular flow reactor and numerical analysis based on reaction kinetics. The main results are as follows : (1) The optimum NO/NH_3 ratio is about 1 to maximize NH_3 decomposition and NO reduction. (2) The NH_3 decomposition ratio depends only on H_2, and decreases rapidly with increasing H_2 concentration. (3) The NO reduction ratio decreases with increasing H_2 concentration. (4) This method is effective for decreasing TFN by up to 60% minimizing the total concentration of remaining NH_3 and NO in air-blown coal-gasified fuel.
社団法人日本機械学会の論文
1995-12-25