Abnormal material returning control system of circulating fluidized bed boiler

The utility model discloses a material returning abnormity control system of a circulating fluidized bed boiler, which is used for alarming material returning abnormity and comprises a hearth pressure difference module, a bed temperature high pressure module, a boiler load module, a hearth negative pressure module and a processing module, the input end of the hearth pressure difference module inputs hearth pressure difference data, and the output end of the hearth pressure difference module is electrically connected with the first input end of the processing module. The control system for the abnormal material returning of the circulating fluidized bed boiler, disclosed by the utility model, can give an abnormal material returning alarm by combining the pressure difference change of the upper layer of the boiler and the negative pressure change of the hearth at each time when the material returning is abnormal, is used for assisting operation judgment, and has the advantages of high judgment precision, high s