No.54 微粉炭燃焼場における硫化水素の挙動解明とモデリング(ガス化・燃焼・液化(1))

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In coal-fired power plant, hydrogen sulphide (H_2S) concentration in boiler has a tendency to become higher owing to low-NO_x combustion, sulfide corrosion of boiler tube hence becomes a severe problem. In this study, numerical model, which is to evaluate H_2S behavior in pulverized coal combustion, was developed. Sulfur behavior was experimentally investigated by using the drop tube furnace (DTF). Results show that sulfur is mainly released as H_2S irrespective of coal property and pyrolysis temperature, and devolatilization rate of sulfur depends on the rate of the form of sulfur in coal, namely, organic sulfur, pyritic sulfur and sulfate sulfur. Therefore, H_2S devolatilization model was developed using the form of sulfur as input parameters. Gaseous reaction model and gas-solid reaction models were also developed and these models were introduced into the numerical simulation code. Furthermore, numerical simulation was performed for the coal combustion test furnace. Results show that the calculated profile of H_2S is qualitatively in good agreement with the experimental result, and the difference of H_2S behavior caused by the difference of coal property can be numerically predicted.
2012-10-15