Flue gas waste heat recovery device based on heat and power cogeneration boiler

The utility model provides a flue gas waste heat recovery device based on a heat and power cogeneration boiler. The flue gas waste heat recovery device based on the heat and power cogeneration boiler comprises a stack and a direct contact type waste heat heat-exchange tower connected with the stack, wherein the stack is connected with the heat and power cogeneration boiler. The direct contact type waste heat heat-exchange tower comprises a tower body, a flue gas inlet, a flue gas outlet, a spray device, a demister, a flue gas booster fan and a heat pump system, wherein the flue gas inlet and the flue gas outlet are formed in the tower body, the spray device is arranged in the tower body, the demister is arranged in the tower body and positioned above the spray device, and the flue gas booster fan is connected with the flue gas inlet. The spray device comprises nozzles in vertical multilayer arrangement and a spray circulating water line extending into the tower body, and is connected with the spray circulating water line, and the heat pump system is connected with the spray circulating water line. The flue gas waste heat recovery device based on the heat and power cogeneration boiler has the advantages that heat of flue gas is absorbed by spray intermediary water, and the temperature is decreased from about 90 DEG C to about 30 DEG C.