Cooling system for metallized pellets of rotary hearth furnace

The utility model relates to a cooling system for metallized pellets of a rotary hearth furnace, and belongs to the technical field of metallurgy. The cooling system comprises a cooling cylinder, a rotary hearth furnace burner, a heat exchanger and a pressurizing machine, the cooling cylinder is provided with an outlet and an inlet and is vertically arranged, the cooling cylinder is sequentially divided into a discharging area, a cooling area, a hot material area and a distributing area from the outlet to the inlet, and the height of the discharging area and the height of the hot material area are both larger than the height of the cooling area so that pressure difference can be formed; a gas inlet pipe is arranged at one end, close to the discharging area, of the cooling area, an exhaust pipe is arranged at the other end of the cooling area, one end, far away from the cooling cylinder, of the gas inlet pipe is connected with an external coke oven gas pipeline, and one end, far away from the cooling cylinder,