中国钢铁行业大气环境影响

Contribution of Emissions from the Iron and Steel Industry to Air Quality in China

本研究基于2015年在线监测等数据,分析中国钢铁行业主要工序(烧结和球团)排口烟气浓度情况,自下而上建立了2015年中国高时空分辨率钢铁行业大气污染物排放清单(HSEC, 2015),使用CAMx模型,定量模拟钢铁行业排放对区域大气污染物浓度贡献.结果表明, 2015年中国钢铁行业共排放SO2、NOx、PM10、PM2.5、PCDD/Fs、VOCs、CO、BC、OC、EC和F分别为37.48万t、 72.05万t、 33.48万t、 15.03万t、 1.91 kg、 84.29万t、 3 478.85万t、 0.64万t、 0.83万t、 0.08万t和0.77万t.从区域角度:上海和天津钢铁行业单位面积污染排放强度最大,对区域大气污染贡献比例较高.从工序角度:2015年烧结和球团烟气排口月平均浓度降低.从污染物角度:2015年钢铁行业排放NOx对区域污染物浓度贡献最大,NOx具有较大的减排潜力.

Based on the data from a continuous emission monitoring systems network in 2015,this study analyzed the compliance rates of exhaust gas in the processes of China's iron and steel industry,and established a high-resolution steel plant emission inventory for China(HSEC,2015),based on the bottom-up method.The contribution of emissions from the iron and steel industry to regional air quality was quantitatively simulated using a CAMx model.The results showed that in 2015,the total emissions of SO2,NOx,PM10,PM2.5,PCDD/Fs,VOCs,CO,BC,OC,EC,and F were 374800 t,720500 t,334800 t,150300 t,1.91 kg,842900 t,34788500 t,6400 t,8300 t,800 t,and 7700 t,respectively.From a regional perspective,the iron and steel industry in Shanghai and Tianjin has the highest emission intensity per unit area and contributes a high proportion to regional air pollution.From a process perspective,in 2015,the exhaust concentration of flue gas in the main process gradually decreased,with a high compliance rate,and the emission factor significantly decreased to lower than that in the existing research results.From a species perspective,in 2015,NOx emission from the steel industry contributed the most to regional air quality,and there is therefore a great emission reduction potential for NOx.