Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
HBIS Group Co., Ltd., Shijiazhuang 050023, China.
J Environ Sci (China). 2023 Jan;123:83-95. doi: 10.1016/j.jes.2022.01.044. Epub 2022 Feb 9.
The iron and steel industry is not only an important foundation of the national economy, but also the largest source of industrial air pollution. Due to the current status of emissions in the iron and steel industry, ultra-low pollutant emission control technology has been researched and developed. Liquid-phase proportion control technology has been developed for magnesian fluxed pellets, and a blast furnace smelting demonstration project has been established to use a high proportion of fluxed pellets (80%) for the first time in China to realize source emission reduction of SO and NO. Based on the characteristics of high NO concentrations and the coexistence of multiple pollutants in coke oven flue gas, low-NO combustion coupled with multi-pollutant cooperative control technology with activated carbon was developed to achieve efficient removal of multiple pollutants and resource utilization of sulfur. Based on the characteristics of co-existing multiple pollutants in pellet flue gas, selective non-catalytic reduction (SNCR) coupled with ozone oxidation and spray drying adsorption (SDA) was developed, which significantly reduces the operating cost of the system. In the light of the high humidity and high alkalinity in flue gas, filter materials with high humidity resistance and corrosion resistance were manufactured, and an integrated pre-charged bag dust collector device was developed, which realized ultra-low emission of fine particles and reduced filtration resistance and energy consumption in the system. Through source emission reduction, process control and end-treatment technologies, five demonstration projects were built, providing a full set of technical solutions for ultra-low emissions of dust, SO, NO, SO, mercury and other pollutants, and offering technical support for the green development of the iron and steel industry.
钢铁工业不仅是国民经济的重要基础，也是工业大气污染的最大来源。鉴于钢铁行业目前的排放状况，已经研发了超低污染物排放控制技术。开发了镁质熔剂球的液相比例控制技术，并建立了高炉冶炼示范项目，首次在中国高比例使用熔剂球（80%），实现了 SO 和 NO 的源头减排。基于焦炉烟气中高浓度 NO 和多种污染物共存的特点，开发了低 NO 燃烧与活性炭多污染物协同控制技术，实现了多种污染物的高效去除和硫的资源利用。基于球团烟气中多种污染物共存的特点，开发了选择性非催化还原（SNCR）与臭氧氧化和喷雾干燥吸附（SDA）相结合的技术，显著降低了系统的运行成本。针对烟气湿度高、碱性强的特点，制造了耐高湿、耐腐蚀的滤料，并开发了一体化预充电袋式除尘器装置，实现了细颗粒物的超低排放，降低了系统的过滤阻力和能耗。通过源头减排、过程控制和末端处理技术，建立了五个示范项目，为粉尘、SO、NO、SO、汞等污染物的超低排放提供了一整套技术解决方案，为钢铁工业的绿色发展提供了技术支持。
