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Limestone gypsum method of flue gas desulphurization

This process is the world's most widely used technology, which is applied in the coal-fired power plants of more than *0% in Japan, Germany and the United States.

Its working principle is: the limestone powder is made into slurry by adding water, which is pumped into the absorbing tower for fully mixing with flue gas. The sulfur dioxide in flue gas and the calcium carbonate in the slurry will react with the help of air pumped from under, during which period the calcium sulfate will be produced. When the calcium sulfate reaches certain saturation, it becomes dihydrate gypsum. The gypsum slurry discharged from the absorbing tower will be concentrated and dehydrated, and then its water content will be less than *0%. Conveyor will send the dry gypsum to storage for stacking. After desulphurization, the flue gas will be discharged into the atmosphere by chimney by passing through the mist eliminator and heat exchanger. The absorbent slurry in the absorbing tower will be circulated by pump, so it can contact with the flue gas repeatedly, accordingly its utilization rate is high and the calcium-sulfur ratio is low. Generally, the desulphurization efficiency is greater than *5%.