​shougang jingtang boosts green sintering development with multi-pg电子(中国)官方网站

at the shougang jingtang plant in caofeidian, two 500-m2 sinter machines are running in an intense and orderly manner with green, efficient, and low-consumption operation. this is thanks to the assistance of the sintering comprehensive injection system which continuously supplies high-quality sinter ore for jingtang’s three 5,500-m3 blast furnaces.

with the announcement of china’s “dual carbon” goals, the research and development of low-carbon and energy-saving technologies have become the “new engine” leading to the high-quality development of industrial enterprises. in long-process steel production enterprises, the sintering process, accounting for 10% of the total energy consumption, has become a critical step in achieving the carbon reduction targets. since jingtang’s two sinter machines were put into operation, it has become the common goal of all personnel engaged in sintering to reduce the energy consumption of the process and realize low-carbon production. to this end, pan wen, chief technical expert of the shougang technology research institute, led the sintering technology team and worked closely with technical personnel from jingtang’s ironmaking department to collaboratively conduct technological breakthroughs, constantly striving for cleaner and more efficient results.

innovative exploration begins with theory. the sintering technology team first embarked on basic theory and conducted extensive literature research and theoretical analysis focusing on heat distribution, demand, and theoretical oxygen consumption in different sintering stages. combining laboratory experiments and industrial test results, they proposed a carbon-oxygen reconstruction theory for the sintering process, established a mathematical calculation model, and clarified the actual demand for oxygen and carbon in different sintering stages, laying a theoretical foundation for the scientific allocation of gas and solid fuel and the efficient utilization of boiler waste gas during sintering.

with this theoretical guidance, the team immediately combined the sintering raw material and process conditions of jingtang to initiate research on key technologies for carbon reconstruction in the sintering process. adhering to linking theory with practice, based on synthesizing the existing technical data, the team systematically conducted technical validation and process simulation experiments, and cleverly combined sintering flue gas circulation, hydrogen-rich gas injection, and steam injection technologies. they ultimately proposed a comprehensive injection technology concept that can not only reduce carbon emissions but also achieve pollutant reduction.

although the technical ideas were clear, how to achieve synergistic enhancement effects among the various technologies became a challenge for the team. to prove its practicability, the team repeatedly scrutinized the flue gas recirculation process parameters, optimized the flue gas circulation route and air volume design, visited many places to specifically investigate hydrogen-rich gas injection processes, and deduced the mechanism of each technology’s effect on the sintering process after implementation. after the validation was basically clear, the sintering technology team conducted several rounds of discussions with production and technical personnel from the ironmaking department, and jointly proposed an implementation plan for the sintering comprehensive injection technology.

the ironmaking department carried out technological transformations in an orderly manner according to the plan design. through the joint efforts of all parties, the sintering comprehensive injection system was officially completed and put into operation. as a result, solid fuel consumption in the sinter machines decreased by 14.6%, energy consumption in the sintering process decreased by 15.5%, and pollutant emissions in the exhaust flue gas were reduced by more than 30%, achieving remarkable comprehensive emission reduction effects. additionally, the sinter utilization coefficient increased by 6.3% and the metallurgical properties of the sinter were significantly improved, realizing the multiple goals of carbon reduction, emission reduction, quality improvement, and efficiency enhancement in the sinter machines. in 2023, jingtang’s no. 1 sintering machine won the title of “champion furnace” in the “national key large-scale energy-consuming steel production equipment energy-saving and consumption reduction benchmarking competition”.

jingtang’s innovative sintering comprehensive injection system has achieved a number of technology integrations such as “waste flue gas collaborative natural gas injection internal flue gas circulation external flue gas circulation humidification injection”, forming a new process for sintering carbon reduction, emission reduction, and quality improvement based on carbon-oxygen reconstruction. it has since been honored as the “2023 excellent environmental protection technology case in the steel industry” by the china iron and steel association, and one of its achievements won the second prize in the metallurgical science and technology awards and first prize in the shougang science and technology awards.