冬季电力行业对长江中游城市群空气质量影响

Impact of the Electric Power Industry on Air Quality in Winter of Urban Agglomerations Along the Middle Reaches of the Yangtze River

为分析长江中游城市群电力行业对区域冬季空气质量的影响,本研究基于自下而上建立的高分辨率排放清单,以污染最严重的典型月份1月为模拟时段,采用WRF-CAMx-PSAT模型模拟现状下电力行业对长江中游城市群的空气质量影响,并另设置关停小机组和大机组替代小机组两种减排情景,对区域空气质量影响进行评估.结果表明,电力行业小机组对区域污染物浓度贡献占整个电力行业对区域污染物浓度贡献比例较大.关停小机组和大机组替代小机组情景下,SO2、NOx和PM_(2.5)的区域浓度贡献相对于关停前削减了36.2%~39.8%、30.5%~33.5%和25.9%~30.7%,且两种减排情景的效果相近.鄂西北地区、湘西地区、襄荆宜经济带和江淮城市群四个地区的小机组污染物排放对区域电力行业污染物贡献影响最为明显,两种减排情景下污染物贡献率相对于现状情景降幅在40%~70%.因此,冬季小机组对长江中游城市群的区域影响较为明显,应加强对长江中游城市群小机组的管控.

A WRF-CAMx-PSAT model was applied to analyze the impact of the electric power industry on urban agglomerations along the middle reaches of the Yangtze River. A high-resolution emission inventory based on a bottom-up approach was developed for air quality simulation. A typical month with heavy air pollution in this region （i. e. , January） was chosen for simulation, and two mitigation scenarios were set for assessing lower capacity power units＇ impact on regional air quality. One scenario was for shutting down the lower capacity power units, and the other was for replacing lower capacity power units with higher capacity power units. Results showed that lower capacity power units contributed bigger pollutant concentrations to the regional contribution of the electric power industry. The concentration contributions of SO2, NOx, and PM25 in the two mitigation scenarios were reduced by 36.2%-39.8% , 30.5%-33.5% , and 25.9%-30.7% , respectively, than those under the current situation. Meanwhile, the decreases in pollutant concentration contribution for different regions were very similar for the two mitigation scenarios. In addition, lower capacity power units in four regions （ i. e. , northwest of Hubei province, west of Hunan province, Xiang-Jing-Yi economic belt region, and Hefei-centered urban agglomerations） contributed obviously to the regional pollutant concentration contributions of the electric power industry. Regional pollutant concentration contributions in the two mitigation scenarios were reduced by 40%-70%. Therefore, lower capacity power units make a bigger irapaet on the air quality of urban agglomerations along the middle reaches of the Yangtze River and should be paid special attention to achieve better regional air quality.