摘要
氮氧化物(NOx)已成为我国首要大气污染物,钢铁工业是工业源NOx排放的主要来源.烧结、球团、炼焦等工序是钢铁工业NOx超低排放改造的重点,但其烟气特性与火电厂烟气存在差异,烟气脱硝技术不能完全照搬现有燃煤锅炉脱硝工艺.目前,选择性催化还原(SCR)、活性炭(焦)(AC)吸附催化、臭氧(O_(3))氧化协同吸收等技术已在烧结、球团、炼焦等工序成功应用,并均取得了良好效果.本文针对钢铁工业超低排放的迫切需求,梳理了钢铁工业烧结、球团、炼焦等主要工序的现有烟气脱硝技术及其应用,重点总结并对比分析了SCR技术、AC吸附催化和O_(3)氧化协同吸收技术的应用进展及优劣势.其中,SCR技术正逐步成为钢铁工业脱硝市场的主流技术,占比超过70%,因此脱硝催化剂及其再生具有长期巨大的市场需求.AC吸附催化和O_(3)氧化协同吸收等新型技术因其适用温度低,无需烟气升温等,在钢铁工业越来越受到青睐,将逐步得到更多钢铁企业的支持.
Nitrogen oxides(NOx)are the primary air pollutant in China.The iron and steel industries have become the primary industrial sources of NOx emissions in China.The NOx emissions from iron and steel industries account for 27.3%of all industrial NOx emissions from sources nationwide,surpassing thermal power generation and cement manufacturing.Over the past ten years,China’s iron and steel industry has achieved tremendous results in flue gas desulfurization,but a huge gap in denitrogenate(deNOx)still remains.In 2019,the Ministry of Ecology and Environment and other departments jointly issued“Opinions on Promoting the Implementation of Ultra-low Emission in the Iron and Steel Industry”,which promoted the retrofitting of ultra-low emission in the iron and steel industry.Sintering,pelleting,coking,and other processes are the focus of retrofitting for NOx emissions.Because their low-temperature flue gas contains several contaminants that differ from the flue gas of thermal power plants,they cannot completely copy the existing deNOx technology for the coal-fired boiler flue gas of thermal power plants.At present,selective catalytic reduction(SCR),activated carbon(AC)adsorption catalysis,ozone(O_(3))oxidation and absorption,and other technologies are used in sintering,pelleting,and coking processes.These technologies have achieved good results.Herein,we investigated the existing flue gas deNOx technologies for sintering,pelleting,and coking processes in iron and steel industries and analyzed the advantages and disadvantages of SCR technology,AC adsorption catalysis,and O_(3) oxidation and absorption technologies.The SCR technology has high efficiency and reliable performance,but the operation process requires heating of the flue gas,which uses large amounts of blast furnace gas or coking oven gas,and the service life of the catalyst is typically approximately three years.The waste SCR catalysts are recognized as HW50 hazardous waste.AC adsorption catalytic technology can simultaneously desulfurize and deNOx;its operat
作者
张柏林
洪华
王天球
张新远
邬博宇
刘波
张深根
ZHANG Bolin;HONG Hua;WANG Tianqiu;ZHANG Xinyuan;WU Boyu;LIU Bo;ZHANG Shengen(Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Jianlong Steel Holdings Co.Ltd.,Tangshan 064200,China;Shunde Innovation School,University of Science and Technology Beijing,Foshan 528399,China)
出处
《工程科学学报》
EI
CSCD
北大核心
2023年第9期1602-1612,共11页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(52204414)
佛山市人民政府科技创新专项资金资助项目(BK22BE001)
北京科技大学顺德创新学院博士后科研资助项目(2020BH012)
中央高校基本科研业务费资助项目(FRF-TP-20-097A1Z)。
关键词
氮氧化物
钢铁工业
超低排放
选择性催化还原
活性炭
臭氧
nitrogen oxides
iron and steel industry
ultra-low emission
selective catalytic reduction
activated carbon
ozone
