Research on the mechanism of bed agglomeration and superheater fouling in CFB boiler fired pure petroleum coke

Circulating fluidized bed combustion is an effective method for the clean and efficient utilization of high-sulphur petroleum coke. In the actual production and operation process, there are serious problems of bed agglomeration and superheater fouling. The chemical and mineral compositions of the deposition were analyzed by X-ray diffraction (XRD) and X-ray fluorescence spectroscopy (XRF), and the effects of CaO sulphation and V2O5 on bed agglomeration and superheater deposits were studied through targeted experiments. The research results show that the sulphation process of CaO is the cause of bed agglomeration, and the superheater fouling is the result of the combined action of K2SO4 condensation and CaO sulphation; V2O5 in petroleum coke ash catalyzes the oxidation reaction of SO2 to accelerate the sulphation of CaO, thereby accelerating the development of bed agglomeration and superheater fouling.