Flue gas waste heat recycling component and application method thereof

The invention discloses a flue gas waste heat recycling component. The component comprises a cylindrical heat exchange cover arranged horizontally, a heat exchanger is arranged inside the heat exchange cover, the heat exchanger is of a round-cake structure, the heat exchanger is arranged obliquely, and the included angle between the heat exchanger and the horizontal plane ranges from 0 degree to 30 degrees; a cavity used for storing liquid is formed inside the heat exchanger, one or more heat exchange holes are formed in the heat exchanger in the vertical direction, the heat exchange holes penetrate through the cavity vertically, and the cavity is not communicated with the heat exchange holes; two horizontal openings, namely a water inlet and a water outlet, are formed oppositely in the side wall of the cylindrical heat exchange cover, the water inlet and the water outlet are communicated with the heat exchanger respectively, and the water inlet and the water outlet are located at the highest point and the lowest point of the heat exchanger in the vertical direction respectively. The flue gas waste heat recycling component is simple in structure, convenient to operate, capable of reducing cost, long in service life, simple to detach and clean and flexible in assembly, and the component can be assembled at will according to technology requirements.