Nitrogen Oxides Emissions from Thermal Power Plants in China: Current Status and Future Predictions

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• 作者：Hezhong Tian ; Kaiyun Liu ; Jiming Hao ; Yan Wang ; Jiajia Gao ; Peipei Qiu ; Chuanyong Zhu
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：October 1, 2013
• 年：2013
• 卷：47
• 期：19
• 页码：11350-11357
• 全文大小：363K
• 年卷期：v.47,no.19(October 1, 2013)
• ISSN：1520-5851

文摘

Increasing emissions of nitrogen oxides (NO_x) over the Chinese mainland have been of great concern due to their adverse impacts on regional air quality and public health. To explore and obtain the temporal and spatial characteristics of NO_x emissions from thermal power plants in China, a unit-based method is developed. The method assesses NO_x emissions based on detailed information on unit capacity, boiler and burner patterns, feed fuel types, emission control technologies, and geographical locations. The national total NO_x emissions in 2010 are estimated at 7801.6 kt, of which 5495.8 kt is released from coal-fired power plant units of considerable size between 300 and 1000 MW. The top provincial emitter is Shandong where plants are densely concentrated. The average NO_x-intensity is estimated at 2.28 g/kWh, markedly higher than that of developed countries, mainly owing to the inadequate application of high-efficiency denitrification devices such as selective catalytic reduction (SCR). Future NO_x emissions are predicted by applying scenario analysis, indicating that a reduction of about 40% by the year 2020 can be achieved compared with emissions in 2010. These results suggest that NO_x emissions from Chinese thermal power plants could be substantially mitigated within 10 years if reasonable control measures were implemented effectively.