dc.description.abstract | The high PM2.5 pollution incidents often happen during autumn and winter in Taiwan. Long-term exposure to high concentrations of PM2.5, the human respiratory system will be destroyed severely, therefore, the issue of air pollution is of great concern to the public. High pollution incidents are mainly affected by the meteorological environment and high local emissions. The annual emissions of nitrogen oxides (NOX) and sulfur oxides (SOX) are dominated by mobile source exhaust emissions, industrial activities and the electric power industry. Nearly 40% of the emissions from all factories in Taiwan come from power plants. According to the data from Bureau of Energy in 2018, nearly 81% of Taiwan’s electricity generation comes from fossil fuels, and 53% of fossil fuels are using traditional coal-burning technologies. Pollutants not only affect the surrounding environment, but also are blown to downwind area. In recent years, the government has been committed to achieving the goals of high power generation efficiency and low emissions. It has introduced a new technology Ultra Super Critical (USC) coal-burning technology which is installed in the Linkou Power Plant to increase power generation and reduce the emissions of nitrogen oxides and sulfur oxide. The purpose of this study is to evaluate the influence of USC technology on Taiwan’s air pollution.
The results of WRF v3.8.1 and Taiwan Emission Data System (TEDS10) were incorporated into CMAQv5.2 for air quality simulation. Case 1 is February 12-13, 2020, and case 2 is February 24 to 25, 2020, at this time, Taiwan’s meteorological environment was in a weak synoptic weather. As western Taiwan was located in the leeside area and the pollutants diffusion conditions were poor, air quality in that region was bad. To further explore the influence of Linkou Power Plant on air quality of downwind area, using Brute Force Method (BFM) to adjust the emissions of Linkou Power Plant to zero (NoLKP) and compared with the Base simulation. Linkou Power Plant mainly affects Taipei, Taoyuan and Hsinchu areas, the hourly mean contribution of PM2.5 is about 0.5~1.5μg/m3. At the same time, in view of the efficiency of how USC technology improving the ambient air quality, calculate the difference Base and Subcritical(SC) which using 2013 Linkou Power Plant emission data into CMAQ model. The results show that the efficiency of air quality improvement in the northern and southern regions are better.
To explore the contribution of other high emission industries and transportation sources in the western Taiwan when high PM2.5 concentration event happened, the contribution of each pollution source is calculated by BFM. When Taiwan is in a weak synoptic weather, each pollution source mainly affects its air quality area, and the factories contribute about 1 to 2%. The Taichung power plant has the most significant impact, and the mobile source contribution affected nearly 16~23%. | en_US |