| 英文摘要 |
The three main tasks of this project include: 1) to integrally analyze air quality data and diagnose the causes of air pollution episode days; 2) to assess the performance of air pollution reduction control for air quality areas; and 3) to promote air pollution reduction for the No.6 Naphtha Cracker off-shore island industrial zone. The critical results are abstracted as bellow:
1) Air quality data analysis and air pollution causes diagnosis
According to the variation of poor air quality rate in the last ten years, it can be seen that the rate of the Middle air quality area reached the highest level during 2004-2006 and then kept decreasing. The poor air quality rate came to the least in 2010, and stay at the same level from January to October in this year. This trend shows that the air quality of the Middle air quality area is gradually improved.
PM10 is the item that was most obviously imporved among all kinds of air pollutants in the Middle air quality area. The concentration of PM10 has steadily decreased from 2005. However, there was no similar trend in the Yun-Jia-Nan air quality area. By analysing PM10 in high concentration and wind direction data, the high concentration occurred at the Changhua, Lunbei and Putzu sites was probably affected by wade dusts nearby. And the unsteady result of the high concentration showed up at the Shinying and Annan sites was considered from constrction or naked field.
Long-term NO2 concentation is the item eliminated most among all kinds of air pollutants, which decreased 22.9% in the Middle air quality area and 22.1% in the Yun-Jia-Nan air quality area as well during 2001-2010. It can be seen that transportation emission also decreased by lower CO concentration.
2) Air pollution reduction control for air quality areas
In this project, totally 2,116 industrial plant surveys of plastic/rubber products manufacturing and chemical products manufacturing were completed. About 750 industrial plants were managed, and 325 tons of air pollutants were controlled. Air pollution condition and the amount of air pollutants can be undertood and controlled more accurately with the increasing number of point sources that are managed. Uncertainty of air pollutants assessment can also be lessened for the same reason.
Based on the comparison of permitted and registered amount of air pollutants, the summation of the registered amount is much higher than that was permitted. The differences were also learned from the plant surveys in this project. Therefore, enhancing operation inspection of point sources is strongly suggested to keep the industial plants surely practicing air pollution reduction, especially the plants that already have pollution prevention equipments.
3) Promotion of air pollution reduction project in the No.6 Naphtha Cracker off-shore island industrial zone
The VOC data of the No.6 Naphtha Cracker off-shore island industrial zone in 188 days to August, 9, 2011 was compiled and calculated according to the latest “VOC standard” published in February, 1, 2011. The occurence rate of the condition that the total sulfur concentration of inletting waste gas over 650 ppm in the cracking plant is about 59%. If H2S were the contributor to the sulfur concentration, it would be against the national act.
In order to make sure that the elimination rate can reach the specific target, the national act requires to operate flares while the total net heat value is higher than 12MJ/Nm3. However, it is shown in the events report of the cracking plant that the total net heat value of the flare is less than the limit, which also reveals that the plant might be against the national rule.
It is suspected that there is a shortage of air pollution fee of the No.6 Naphtha Cracker off-shore island industrial zone. The amount is about 605 tons of SOx and 2,023 tons of VOCs each year. The payment of two defects, failed heat value of flare operation and the VOC emission concentration of equipment components are recommanded to be pursued. Other defects should be improved by revising the emission rates of air pollution control fee.
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