Abstract: The dry bottom ash handling system affects the slagging and boiler efficiency. This paper analyzes the influencing factors of the slagging and boiler efficiency and proposes the measures to reduce the negative effects of the dry bottom ash handling system. Meanwhile the effects of slagging property coal on the wet slag system are analyzed. The study indicates that more attention should be paid to the furnace design, heat exchanger arrangement and combustion management to avoid boiler slagging. For boilers burning easy slagging property coal, effective measures should be taken to ensure the safe operation of the bottom ash handling system, whether dry or wet, and reduce the negative impacts on boiler combustion. The selection of the bottom ash handling system should follow the DL/T5142 Technical Code for the Design of Ash Handling System of Fossil-Fired Power Plant and the combustion of easy slagging property coal should not be the only reason for abandoning the dry bottom ash handling system.

Key words: slagging, boiler efficiency, dry bottom ash handling system, wet bottom ash handling system