| Summary: | 碩士 === 東海大學 === 環境科學系 === 90 === Burning of coal supplies more than 60﹪ of the electricity generated in Taiwan. Coal-burning utilities have responded to evolving clean air standards in a number of ways, including adding flue-gas desulfurization（FGD）to existing plants or switching to lower sulfur coals. Most of the SO2 emissions from coal-fired power plants－and almost half of all SO2 emissions－would be eliminated if all power plants were held to the new plant standards. The new emission standard imposes much stricter emissions limits on coal-burning power plants. In order to determine the effect of power plant SOx reduction strategies and the resulting change of surface SO2 concentration distribution, this study used the Circuit trajectory transfer coefficient model（CTx v0.73）and ISC model to simulate the period of 1997 to 2000.
The results show that the contribution to surface SO2 concentration from the Taichung power plant has gradually decreased and the impact from the Tunghsiao power plant has become more important. The comparison between 1997 and 2000 from the Taichung power plant indicated a decrease from about 5~10ppb to 1ppb. When applied in the Homei, Lukang, Hsienhsi, Shenkang and Wuchi regions it also indicated that the Taichung power plant contribution in 2000 was about 66~85﹪ lower than 1997. The main area affected by the Taichung power plant emission is the cities of Changhwa and Taichung. The Tunghsiao power plant contributed 5~10ppb of SO2 from along the Taichung county seashore area to the Datu Hill.
Meteorological conditions play an important role in the dispersion of air pollutants. In this study, SO2 levels from the power plant have been found to be affected by mixing height and solar radiation.
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