TY - GEN
T1 - Numerical simulation of molten-slag flow in coal gasifier
AU - Otaka, Maromu
AU - Watanabe, Hiroaki
AU - Hara, Saburo
PY - 2005/11/21
Y1 - 2005/11/21
N2 - In this paper, numerical simulations of the heat transfer in molten-slag flow with free surface and phase change (solidification) is carried out, and we propose a new evaluation method for discharging performance of the molten-slag from coal gasifier. A stable operation of the coal gasifier requires that the molten-slag should be discharged from the slag-hole continuously. In the maintenance of discharging a molten slag, it is necessary to keep the molten-slag temperature higher than an ash fluid temperature, and to hold the fluidity of the molten-slag. From the viewpoint of gasification performance, if the air ratio is set low in order to raise the cold gas efficiency, the molten-slag is not able to get enough heat for its discharge, because of the lowering of gas temperature in the coal gasifier. To strike a balance between the maintenance of continuity on the molten-slag discharge and the improvement in gasification performance, it is important to develop a prediction and evaluation method for discharge performance of the molten-slag from coal gasifier.
AB - In this paper, numerical simulations of the heat transfer in molten-slag flow with free surface and phase change (solidification) is carried out, and we propose a new evaluation method for discharging performance of the molten-slag from coal gasifier. A stable operation of the coal gasifier requires that the molten-slag should be discharged from the slag-hole continuously. In the maintenance of discharging a molten slag, it is necessary to keep the molten-slag temperature higher than an ash fluid temperature, and to hold the fluidity of the molten-slag. From the viewpoint of gasification performance, if the air ratio is set low in order to raise the cold gas efficiency, the molten-slag is not able to get enough heat for its discharge, because of the lowering of gas temperature in the coal gasifier. To strike a balance between the maintenance of continuity on the molten-slag discharge and the improvement in gasification performance, it is important to develop a prediction and evaluation method for discharge performance of the molten-slag from coal gasifier.
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M3 - Conference contribution
AN - SCOPUS:27744546064
SN - 0791841820
SN - 9780791841822
T3 - Proceedings of the ASME Power Conference, 2005
SP - 1471
EP - 1476
BT - Proceedings of the ASME Power Conference, 2005
T2 - 2005 ASME Power Conference
Y2 - 5 April 2005 through 7 April 2005
ER -