There are a series of advantages in use of seawater as absorbent to remove SO2 in stack gas. Use of seawater for stack gas desulfurization is the first choice method for thermal power plant located on seaside. A study on the possibility of desulfurization by seawater of the East China Sea has be done by our institute. The qualities of seawaters have been investigated. These seawater samples were sampled from the East China Sea located Shanghai and Zhejiang province in China. The stack gas desulfurization of coal-fired power plant by seawater was conducted on 100 m3/h scale at Zhejiang. A pilot plant with 6000 m3/h scale has been completed and put into operation in Shanghai. It is found that the removal efficiency of SO2 increase with ratio of seawater with stack gas. The removal rate of SO2 in stack gas reached about 90≈95% when a plate tower was used. The waste seawater absorbed SO2 can return to the sea after aeration and neutralization.
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