Primary Air Pollutant Emissions and Future Prediction of Iron and Steel Industry in China

10.4209/aaqr.2015.01.0029

Xuecheng Wu；Lingjie Zhao；Yongxin Zhang；Chenghang Zheng；Xiang Gao；Kefa Cen

Iron and steel industry ； Emission inventory ； China ； Process and technology-based methodology

Aerosol and Air Quality Research

15卷4期（2015 / 08 / 01）

1422 - 1432

英文

China is the largest iron and steel producing and consuming country in the world, which leads to enormous quantities of emitted air pollutants. Direct emissions of air pollutants from the iron and steel industry in China were estimated by developing a process and technology-based methodology using information of the proportion of pig iron, crude steel, and rolled steel produced from different processes and technology. Emissions of sulfur dioxide (SO_2), nitrogen oxides (NOx), particulate matter (PM), volatile organic compound (VOCs), and dioxin (PCDD/Fs) were estimated for the year 2012, and future emissions of major pollutants (SO_2, NOx, TSP) were projected up to 2030 based on technology developing trends and emission control policies. According to the estimation, 2222kt of SO_2, 937kt of NOx, 1886kt of TSP, 555kt of PM_2.5, 254kt of VOCs, 618 g I-TEQ of PCDD/Fs was produced in China in 2012. Sintering produced 72.4% of SO_2, 49.4% of NOx, 22.5% of TSP, 24.0% of PM_2.5, 69.6% of VOCs and 98.0% of PCDD/Fs, which is the main emission source. Through faithful implementation of closing down outdated production and emission control policies, approximately 77%, 49%, 67% and 64% of SO_2, NOx, TSP and PCDD/Fs emissions, respectively, could be further reduced in 2012. Emissions in 2020 and 2030 of iron and steel sectors were predicted applying scenario analysis. The removal potential for SO_2 and TSP is larger than NOx by improvement of removal facilities, and southwest, northwest, and north China has the largest SO_2, NOx, TSP and PCDD/Fs removal potential respectively.