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Nowadays, the method of wet limestone-gypsum flue gas desulphurization （FGD） is the most widely used in the world. But the early investment、 operation and support expenses of this system are very high. To some extent, the high expenses hold up the application of FGD in our fired power station. Therefore, in order to reduce the expenses of FGD system and economize the area, optimization of the FGD system design has got important meaning.This text introduce firstly about the SO2 emission situation and controlling status. Some advanced FGD techniques and their applications worldwide also be introduced thoroughly. Then taking the aim at the limestone-gypsum FGD process, the most widely used domestic and international in the thermal power plant the current. Analyzing the principle, typical process, system equipments and their functions and characteristics about this FGD process. Then basing on a new set up power units （2 X 300MW）, put forward two sets of total processes. Studied completely and systematically that under the current technique term, how to reduce the expenses of the FGD system through designing, choosing and optimizing, moreover, it also can economize the area, and was more effective and safety. At last, the evaluation of economy about the selected progress was analyzed.Through designing and optimizing, the total static state investment of process I cost roughly 132,000,000 RMB, the unit removal costs was 220 RMB/kW.h. Be converted to each kW.h was 0.0091RMB, and remove of each ton SO2 cost 952.5RMB. Compared to process II, the total static state investment reduced 15,000,000RMB, pure operation expenses each year reduced roughly 2,300,000 RMB, reduced area roughly 1000m2. The research indicates that it must be very careful to select removal rate and the coal’ Sar%, and could not pursue to too highly removal rate and Sar% blindly, because it will increase system investment and operation expenses consumedly. At the same time, canceling the GGH is viable. A set of wet chimney FGD system compare to the system which with GGH was Not only economic area, but also has much lower investment and operation expenses.
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