Quantitative Assessment Of Energy Conservation Potential And Environmental Benefits By Green Transformation For The Typical Iron And Steel Enterprise In Henan Province

After decades of development,China has surpassed Japan to become the world's largest iron and steel producer.China's crude steel output reached 832 million tons in 2017,accounting for half of the world's total output.The iron and steel industry has made important contributions to China's economic development,while it also causes serious damage to the environment.In 2017,the emissions of SO2,NOx and dust in China's iron and steel industry accounted for 7%,10%and 20%of the total pollutant emissions in the country.At present,energy,resources and environment issues have become important challenges for sustainable development,and exploring the green transformation approach of iron and steel industry has become the primary task.This study selected Anyang Iron and Steel Group Co.,Ltd.,a typical iron and steel plant in Henan Province,as the research object.First,a comprehensive emission inventory of pollutant emissions was established through emission factor method.The emission inventory has laid the foundation for the follow-up assessment of energy saving and emission reduction potential in Anyang Iron and Steel Group.Secondly,the crude steel production and scrap reserves in Henan Province were forecasted in this study,and the energy saving and emission reduction potentials of Anyang Iron and Steel Group in 2020,2025 and 2030 were evaluated.Finally,based on the three green transformation approaches of energy efficiency improvement,EAF promotion and charcoal substitution,the business-as-usual(BAU)scenario,energy efficiency improvement(EEI)scenario,energy structure adjustment(ESB)scenario,production structure adjustment(ESI)scenario,and integrated(ITG)scenario were designed,and the energy saving and emission reduction potential of Anyang Iron and Steel Group was comprehensively analyzed.The traditional energy conservation supply curve has been improved by combining with the emission reduction benefits of air pollutants to accurately assess the cost-effectiveness of energy efficiency technologies.The main conclusions are as follows:(1)Through the establishment of an emission inventory,it can be found that the sources of pollutants in Anyang Iron and Steel Group include fuel combustion sources and process sources.The fuel combustion source is the main source of greenhouse gas emissions,accounting for 91.6%of the emissions,of which the greenhouse gas emissions caused by the coking process are as high as 8.4 million tons CO2-eq.Air pollutants mainly come from process sources,of which 73%of VOCs comes from the coking process,and 45%of CO comes from the sintering process.(2)Under the synergistic effects of the three green transformation approaches,significant energy-saving and environmental benefits could be achieved in Anyang Iron and Steel Group.Energy consumption in ITG scenario is significantly reduced,from 4.19 million tons of standard coal in 2017 to 2.99 million tons of standard coal in 2030.In 2025,Anyang Iron and Steel Group's greenhouse gas emissions under the BAU scenario,EEI scenario,ESB scenario,ESI scenario and ITG scenario will be 11.14,10.25,10.25,9.55 and 8.06 million tons CO2-eq,respectively.In ITG scenario,the emissions of SO2,NOx,PM2.5,PM10,CO and VOCs in 2030 are decreased by 54.14%,37.44%,27.95%,41.42%,18.64%and 26.1%,respectively,compared with BAU scenario.(3)Combining the energy conservation supply curve with the emission reduction benefits of air pollutants can significantly reduce the cost of the technology,which is more conducive to the promotion and application of the technology.Taking into account the benefits of emission reduction,23 of the 31 technologies of the BF-BOF route are cost-effective,and 11 of the 17 technologies of the EAF route are cost-effective,with cumulative energy savings of 5.97 and 2.47 GJ/ton of crude steel.This research provides important theoretical support for the green and sustainable development of the iron and steel industry,and provides a scientific basis for the Henan Provincial Government to formulate energy-saving and emission reduction policies for the iron and steel industry,to promote the green transformation and upgrading of the iron and steel industry in Henan Province.