In 2020, Shougang Jingtang will improve the blast furnace operation system, continue to optimize the large-ball ratio smelting technology of the large blast furnace, and ensure the long-term stable operation of the blast furnace. It will scientifically grasp the two key indicators of molten iron physical heat and furnace temperature, and focus on the use of big data and information. Refined operations are strengthened by means of chemical and other means. At the same time, facing the challenges of new crown pneumonia epidemic prevention and control, environmental protection management, series of maintenance, etc., we have worked hard and worked hard to take the initiative to ensure the high-level operation of blast furnaces. Three large-scale blast furnaces of 5,500 cubic meters are comprehensive Complete various production tasks in 2020. Talk about technology and respect the laws of scienceIn 2020, Shougang Jingtang aims to fully realize the "Four First Classes", work hard on refinement, continuously accumulate technical experience and form quantitative indicators to guide operations, and achieve high-level operation of blast furnaces. "We adhere to the scientific and refined transformation, attach importance to data quantification and technology accumulation, and insist that digital ironmaking has become the technical pursuit of the ironmaking department." Wang Kai, the minister of the ironmaking department, said confidently.In 2020, under the large ball ratio charge structure, the Ironmaking Department will rely on the "Wu Shengli Expert Workstation" and three blast furnaces to further promote the metallurgical performance analysis of the comprehensive charge structure, improve the charging sequence of ore and coke, and optimize the blast furnace slag system. The research work on the reasonable matching of the charging system and the air supply system has formed the Jingtang blast furnace operation system through quantitative technical standards. The ironmaking department has established a four-shift evaluation mechanism daily and monthly by setting up operational indicators such as the “Blast Furnace Temperature Hit Rate” for the blast furnace operator, and improved and strengthened the implementation of the "Blast Furnace Temperature Management Measures" to ensure that the blast furnace full air rate reaches Above 98%; under the premise of stable furnace conditions, the oxygen enrichment rate of the three blast furnaces has gradually increased to above 7.0%, the activity of the hearth continues to increase, and new breakthroughs have been made in the consumption of molten iron.The production of pellets starts with ingredients, temperature, and mineral phases. The reduction expansion rate of acid and alkali pellets is scientifically controlled to be less than 14% and 18%, respectively, and the proportion of high finished pellets from 10 mm to 14 mm is greater than 80% and 85%, respectively. The ironmaking department explored the mechanism of alkaline ball reduction expansion over time to improve the quality of falling earth agglomerates. Sintering production is calculated through the solid waste ratio measurement, combined with the characteristics of the solid waste varieties, differentiated storage and allocation, to ensure that the load of harmful elements into the blast furnace reaches the standard. By using magnetic powder, maintaining proper alkalinity, steadily increasing MgO content, and reducing Al2O3 content, the department will achieve an average low-temperature reduction and pulverization rate of sintered ore of 70.12% in 2020, the best level since the startup. This department uses the favorable conditions of self-produced white ash to effectively increase the alkalinity stability rate of sinter.In addition, through technical research, the three blast furnaces of this department have successively realized the production mode of three tapping, which not only activates the hearth, improves and optimizes the gas distribution, reduces the pressure difference in the furnace, and improves the response to sudden changes in blast furnace tapping. The ability to adapt to the development situation has made production and operation more stable, creating conditions for the blast furnace to increase production and achieve results. The first blast furnace and the second blast furnace will realize the pressure equalization transformation of the hot blast furnace in May and September 2020 respectively, which reduces the fluctuation of air pressure during the furnace exchange process. The air volume and air pressure of the blast furnace is more stable during the furnace exchange. The fluctuation dropped from the original 200 cubic meters/minute to below 100 cubic meters/minute.At the beginning of 2020, due to the impact of the new crown pneumonia epidemic, Shougang's secret iron production was suspended, which means that Jingtang pellets, who are used to eating "fine grains", will have to eat "Hundred Foods", which is a severe test for pellet quality control and blast furnace adaptability. Jingtang Ironmaking Technicians, Shougang Technology Research Institute, Wu Shengli Expert Workstation, etc. conducted joint scientific research to reduce fluctuations in the quality of sinter and pellets, thereby reducing the impact on the condition of the blast furnace. To this end, Shougang Jingtang Co., Ltd., based on the premise of the smooth stability of the blast furnace, is striving to stabilize the quality of raw materials entering the furnace while expanding non-Peruvian resource channels. Shougang Jingtang Manufacturing Department, Ironmaking Department and Shougang Technology Research Institute organized 28 non-Peruvian fine powder blending test technology research, pellets conducted "cage test" 23 times, new resource sinter cup test 6 times, and improved RDI sintering Twelve cup tests, 18 comprehensive charge metallurgical performance tests... 293 sets of tests were carried out 87 times to ensure that the quality of pellets and sinters into the furnace meets the needs of the blast furnace during the application of new resources and the adjustment of the raw material ratio. The company adjusted the pellet structure more than 60 times in accordance with the principle of "early adjustment, less adjustment, and fine adjustment". Based on laboratory tests and industrial applications, the company purchased and added 2.02 million tons of non-secret resources, successfully coping with the adverse effects of the new crown pneumonia epidemic caused by the secret iron, and ensuring the stability of the blast furnace.Keep your eyes inward and consolidate basic managementStability is the soul of organizing iron production.In the daily production of the blast furnace, the four-shift operator of the ironmaking process strictly implements the operating system and actively connects the various systems. The ironmaking process strengthens the process control in the furnace, enhances the rapid reaction ability of the technicians, pre-judges the trend of the furnace conditions, makes control adjustments in advance, and maintains a reasonable and stable thermal system. By strengthening the summary of the operation law of blast furnace materials, the technicians carefully master the metallurgical performance parameters of various furnace materials, and fine-tune the proportion of addition. Wang Xiaopeng, secretary of the party committee of the ministry, said: “Now we have a clear division of labor and each perform its own duties. There are standards and red lines for blast furnace operations, and everything is managed. The entire blast furnace system is not in charge of a certain leader, but data and standards. ."At the peripheral management level of the blast furnace, the Ministry advocates the “three clarifications and three in place” as the starting point, lays out problems, implements responsibilities, sinks to the scene to strengthen services, and pays close attention to closed-loop management. Stable quality of raw materials and fuels is a powerful guarantee for efficient operation of blast furnaces. To this end, the ironmaking department actively organizes and strengthens control from the aspects of charge quality assurance, quality monitoring, and warehouse location control. The production of sinter is measured and calculated through the ratio of solid waste to separate storage and distribution to ensure that the load of harmful elements into the blast furnace reaches the standard. Kang Haijun, deputy director of the Production Technology Office, said: "Now we strictly control the harmful elements in the blast furnace, and the standards and red lines are very clear. We follow up and calculate from the pellets, sintering and blending to ensure that the harmful elements entering the furnace are within the standard range." Strengthen management, establish a weekly tracking mechanism for raw and fuel quality, strengthen closed-loop management of inspection and tracking of raw materials entering the factory, raw materials warehousing, and raw materials, and improve the ability to organize and guarantee the stability of the incoming charge. The raw material professionals Di Helong, Liu Yudong, and Dong Maolin visit the stockyard every day to find out the physical quality of the blast furnace raw fuel that day, and guide the blast furnace to do a good job in operation and response. Liu Yudong said: "The purpose of looking at the material is to know what we know. Once we know it, so will the blast furnace."Be prepared for danger in times of peace. The Shougang Group and the company’s party committee have made long-term decisions and made decisive decisions with the goal of longevity of the blast furnace. In July 2019, the second blast furnace was overhauled and put into operation smoothly, and the first blast furnace was completed and put into production in May 2020. The large-scale maintenance of two 5,500 cubic meters blast furnaces for two consecutive years is unprecedented for Shougang Jingtang. The iron smelter did not back down, faced the problem and worked harder, overcoming many construction problems, and completed high-level overhauls of two blast furnaces, which eliminated hidden operating hazards from the root cause, improved equipment performance, and provided hardware guarantees for the high-level operation of the blast furnace. This is like giving the "soldiers" on the battlefield a more sophisticated "weapons". Equipment inspection personnel closely focus on the goal of "maintaining smoothness and stability", strengthen equipment operation management and control, clarify management responsibilities by improving equipment system management methods, and effectively integrate maintenance inspection units, production positions, inspection and professional management forces to perform inspection work Refinement and full-time work further clarify the division of labor, provide equipment maintenance training for production positions, promote the independent management of equipment by post employees, and realize full participation in equipment management, which provides a guarantee for the smooth and stable production of the blast furnace.The balance of ferro-coke has always been a key problem affecting the balance of the company's operating and production rhythm. In 2020, high-level operation of blast furnace production will create conditions for a breakthrough in post-steel production and at the same time create conditions for iron coke balance. Entering 2020, Shougang Jingtang will take the integrated management of iron fronts as the starting point, focusing on the goal of "guaranteeing supply and reducing costs" to overcome the impact of the new crown pneumonia epidemic on the supply of blast furnace materials. The manufacturing department takes the lead in organizing the ironmaking operation department, Various departments of the pre-iron system, such as the coking operation department and the material supply operation department, actively promote the integration of "production-supply-research". With the weekly iron maintenance meeting as the link, the changes in the types and proportions of materials between departments have been gradually formed "Adjustment-feedback-adjustment" work coordination mechanism. Since 2020, three blast furnaces have actively responded to the suspension of iron ore production in Peru, created a new model of alternative varieties, overcome the impact of frequent changes, overcome difficulties, and achieved high-level operation of blast furnaces. The average coke load has stabilized above 5.3, which is a new balance for iron and coke. The breakthrough has laid a solid foundation.A century of ironmaking has cultivated a rich tradition and a rich cultural heritage. Entering the new era, the party committee of the Ironmaking Ministry takes "world leader" as its mission, inherits and carries forward the spirit of Shougang, cultivates the iron man sentiment of cadres and employees who love iron making and cares about blast furnaces, and promote the common development of iron making people and the iron making industry, and make a century The ironmaking culture has given new vitality in the new era.
