Biomass and pulverized coal premixing device, operation method and application

The invention provides a biomass and pulverized coal premixing device, an operation method and application, the premixing device comprises a fuel spray pipe and an air spray pipe arranged on the periphery of the fuel spray pipe in a sleeving mode, a mixing block is arranged on the inner surface of the fuel spray pipe, a rotating blade is arranged in an annular cavity between the fuel spray pipe and the air spray pipe, a fuel inlet and a pulverized coal inlet which are mutually independent are formed in one end, extending out of the air spray pipe, of the fuel spray pipe, an air inlet is formed in the air spray pipe, one end of the premixing device extends into a hearth, and fuel and pulverized coal are injected into the fuel spray pipe to be mixed and then injected into the hearth of the boiler under the air injection action of the air spray pipe. According to the biomass and pulverized coal premixing device, the safe and stable combustion of biomass materials is achieved, energy generated by combustion is co