The invention discloses a cover for
barrel roasting heat exchanging. A center hole is formed in the middle of the cover arch of the cover and is communicated with a
flame path (23). The center hole is connected with a vertical flow guiding cylinder (2).
Fuel gas heat exchanging pipelines (4) and hot air pipes (5) are arranged in the flow guiding cylinder (2). The heat exchanging pipelines (4) and the hot air pipes (5) are arrayed in a distributing mode to form a heat exchanging longitudinal
pipe group. The number of the pipelines (4) and the number of the air pipes (5) of the heat exchanging longitudinal
pipe group are the same. The lower portion of the heat exchanging longitudinal
pipe group is communicated with the horizontal sections of the pipelines (4) and the air pipes (5) in the
flame path (23). The horizontal section pipelines (4) and the air pipes (5) are arrayed in the
flame path (23) in a
radiation mode. Fluid of each pipeline (4) and each air pipe (5) in the flame path (23) is communicated with the same
combustion chamber (9). Flames and
smoke can go to an upper cavity through a gasification pipe (29). The upper cavity is communicated with a
tail gas outlet (1). A gasification section is provided with a water replenishing opening (11). A steam outlet (6) is formed above the water replenishing opening (11), so that steam is discharged.