Pilot scale entrained coal gasifier used in IGCC (Integrated Coal Gasification Combined Cycle) is numerically analyzed. Flow field and particle trajectory are calculated using Euler-Lagrange approach by cold model. In this paper, the throat diameter and the number of slag holes are mainly discussed. As a result, calculated results are in good agreement with experimental ones in axial and tangential velocity components. The effect of the throat diameter affects flow field, i.e. the larger the throat diameter, the smaller the axial velocity component in the upper part of combustor. On the other hand, it is shown that the effect of the number of slag holes on flow field is small.
