465323 Performance and Dynamic Behavior of Shell Entrained-Flow Gasifier By Coals with Different Moisture and Rank in a 300 MW Integrated Gasification Combined Cycle (IGCC) Power Plant
The effects of coal moisture amounts and ranks on the dynamic behavior and efficiency of coal gasifier were investigated by using the developed dynamic model. The outlet gas composition and amount of syngas were significantly affected by coal moisture as well as rank. In addition, the slag formation in a gasifier and additional steam generation in a membrane wall were changed by the amount of coal moisture even though the same rank coal was used. The amount of steam generated in syngas cooling zone was also predicted in accordance with coal ranks. Since some coals led to low slag temperature, severe accumulation of slag layer on the gasifier wall was observed. Therefore, when a feed coal property is changed, operating conditions should be delicately controlled because many units after the gasifier, such as WGS reactor, sulfur removal unit, and gas turbine, are affected by generated gas property and amount. It is expected that the simulated dynamic results can give a guideline to operate a coal gasifier according to coal moisture and rank.