The hot feed can increase the temperature by exchanging heat with the purified water at the bottom and side line, thus reducing the consumption of stripping steam.
Cold feed is used to control the temperature at the top of the tower to prevent the outlet pipeline from being blocked by washing at the top of the tower.
Cold feed is equivalent to cold reflux, and controlling the temperature at the top of the tower is also a measure to reduce the energy consumption of the device.
In order to control the temperature at the top of the tower, the cold feed dissolves and recovers ammonia to obtain pure hydrogen sulfide. Hot feed mainly provides raw materials to heat up to reduce the energy consumption of steam at the bottom of the tower, and ammonia can also be obtained from the side line.