TDPモデルを用いた微粉炭燃焼場の数値解析 : 第1報,小型ジェットバーナへの適用(熱工学,内燃機関,動力など)

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A new coal devolatilization model employing a tabulated-devolatilization-process (TDP model) is developed, and its validity is investigated by performing a numerical simulation of a pulverized coal combustion field formed by a small non-swirling jet burner. In the TDP model, appropriate values of the devolatilization parameters, which are the ratio of volatile matter mass to coal particle mass and the pre-exponential factor and activation energy in the volatile matter evolution rate equation, are extracted from the devolatilization database. Namely, these devolatilization parameters are stored beforehand in the database for various temperature histories, and are valued for each coal particle depending on the actual individual particle heating rate in the pulverized coal combustion field. The predicted characteristics of the pulverized coal combustion field employing the TDP model are compared with those employing the conventional delolatilization model and the experiments. The results show that the coal particle velocities predicted by the numerical simulation employing the TDP model are in better agreement with the experiments than those employing the conventional model, with a slight increase in computation time. Since the TDP model can represent the devolatilization behavior at various particle heating rates, it is expected to facilitate the accurate numerical simulations of pulverized coal combustion fields under various combustion conditions.
2010-09-25

TDPモデルを用いた微粉炭燃焼場の数値解析 : 第1報,小型ジェットバーナへの適用(熱工学,内燃機関,動力など)

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