サイクロン式石炭ガス化器のコールドモデルシミュレーション : 第1報,代数応力モデルによるフローパターン解析

概要

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An isothermal swirling flow pattern in a cold model of a two-stage air-injection cyclone slagging gasifier is numerically analyzed to attain both high slag rejection and gasification efficiency by elucidating the optimum shape and operation parameters. In this numerical analysis the turbulence Algebraic Stress Model coupled with the QUICK method for discretization of the convective terms is adopted. The numerical mesh size is adjusted locally to stabilize the calculation. It is possible for this analytical treatment to simulate accurately the strong swirling turbulent flow field taking place in the gasifier. It is found that the simulated results agree well with the experimental results for the various shape and operation parameters such as the exit diameter and gas-supply conditions. In order to obtain the optimum flow field, the exit diameter should be larger than half the furnace inner diameter, and the injection angle of the downsteam air should be 30 deg.
一般社団法人日本機械学会の論文
1995-11-25