Abstract: The waste heat boiler is key equipment in gasification unit of IGCC power plant. The whole system efficiency can be improved by adopting the waste heat boiler to recover the heat of syngas. The waste heat of the boiler has three characteristics, high temperature, high pressure and strong reduction. Some problems must be pay more attention to solve , such as temperature corrosion, seal, and slag discharge for The radioactive waste heat boiler and fouling, plug and wear for the convection waste heat boiler .The key issues for research and design of waste heat boiler were summarized and analyzed, and the related methods were proposed.

Key words: IGCC, waste heat boiler, heat recovery, waste heat utilization