Abstract:

Aiming at the problem that the waste heat of the hydration tower of two-step thermal phosphoric acid process was notutilized,a waste heat utilization scheme and device for the hydration tower was proposed.According to the energy balance,the energy flow chart of the hydration tower was obtained,and the heat balance equation of the hydration tower was established.The calculation formula of the thermal efficiency positive and negative balance of the hydration tower,the heat exchange amount in the tower,the steam production and various heat losses were obtained.Technical measures to im-prove the heat utilization efficiency of the hydration tower were analyzed and an example calculation was conducted.

Key words: thermal process phosphoric acid, hydration tower, heat balance, heat utilization efficiency