Optimization And Economic Evaluation Of Wet Flue Gas Desulphurization Technology

In recently, the environment, social economy and human life suffer from large amounts of SO2 emission. We know that most of the coal- fire power plants in China solve the problem on SO2 emission by using the limestone-gypsum Wet Flue Gas Desulfurization(WFGD) system. However, with the development of economy and industry, the traditional limestone- gypsum(WFGD) system can’t meet the strict request of the air pollutants emission in C hina. So based on the limestone-gypsum(WFGD) system. The foreign researcher give some propose for the traditional(WFGD).Most of researches about the modification of the limestone-gypsum(WFGD) focus on analyzing system and comparing the advantages and disadvantage of each technique. However, for the power plants, they will pay more attention to applicability and economic effect of the WFGD. Nowadays, few people make a optimal choice based on the actual conditions in plant. At the same time, Few people use the scientific method to analyze the technical parameters and economic effect of the modification about WFGDIn order to solve the problem abo ve, this research will use the fuzzy comprehensive evaluation which is more reliable, after analyzing several kinds of process evaluation method and the actual requirements of power plant. Based on the principle of the system in this four limestone- gypsum WFGD, fuzzy comprehensive evaluation and three dimension we got the result as the below show:This research use the fuzzy comprehensive evaluation method to assess different modification of the limestone- gypsum(WFGD). Then we determine evaluation standard to find the difference between the optimum WFGD and the traditional one. The standard include liquid- gas ratio, transformation area, maintenance cycle, the time to modify, new operation cost and new power consumption to total output.By the method of multi- level fuzzy comprehensive evaluation in assessing four kinds of WFGD, we draw a conclusion below: synthesizes each kind of situation, the arrangement from high to low is Swirl atomizing transformation, Desulfurization tower reconstruction, tray modification and the twin tower binary transformation. According to economic effect, the arrangement is the same as above.This paper analyzes the GuangZhou power plant after using Swirl atomizing transformation in three dimension about investment, new operating cost and environment effect. The total investment for the modification is 3.9 million yuan. Unit investment is 32.5RMB/KW. The cost for operator is 958581 yuan per year. The electricity price increase by 0.00145yuan/degree without change the effect. The environmental effect is 828351 yuan per year. All in all, the Swirl atomizing transformation used by GuangZhou power plant is a economic and feasible way.Based on the research above, this paper can provide the way to calculation and act as reference for the coal-fire power plant in modification of WFGD.