Abstract: A certain chemical plant is equipped with three 75t/h circulating fluidized bed boilers. These boilers have significant advantages in fuel adaptability, combustion efficiency, environmental protection performance and utilization of ash and slag. However, due to their unique combustion mechanism and oil gun ignition method, the accident risk during the startup stage of these boilers is markedly higher than that of conventional types. This paper mainly analyzes the common coking accidents and furnace explosion accidents during the startup of circulating fluidized bed boilers, and elaborates on how to prevent the occurrence of these accidents. The aim is to enable timely detection of problems in future work and to handle accidents safely and smoothly.

Key words: circulating fluidized bed boiler, accident, coking, furnace explosion