Green, low-carbon and intelligent lead the transformation and upgrading of the steel industry

The by-product gas produced in the process of iron and steel metallurgy is a high-quality raw material of carbon chemical industry. Coke oven gas and converter gas can be purified and used to synthesize a variety of chemical products, so that resources can be used more effectively and carbon emissions can be reduced more greatly. The integrated intelligent control system for the production and energy of tempered joint enterprises developed by MCC South, through the flat monitoring, management and system optimization of the global energy production and consumption of enterprises, establishes an objective energy assessment and evaluation system, promotes the optimization of the allocation of gas resources in iron and steel enterprises, improves the energy utilization rate, and builds an energy industry chain, thereby reducing carbon emissions.

In order to solve the problem of energy waste and environmental pollution caused by the emission of a large amount of low-calorific value gas in the process of iron and steel smelting, MCC South developed a series of high-parameter miniaturized gas power generation technology, which is the best guarantee means of "zero gas emission" dispatching, and the technology won the first prize of metallurgical science and technology. This technology has been iteratively upgraded to the 6th generation - supercritical gas power generation technology, the thermal efficiency of the whole plant can reach 46%, which is 50% higher than the power generation efficiency of traditional technology.

The primary gas purification and recovery process of traditional converter adopts spray method for initial dust removal, which not only causes waste of sensible heat resources below 900℃ in the flue gas, but also consumes water, steam and electricity. As a leader in the domestic primary flue gas treatment technology of converter, MCC South has developed pure dry purification and deep recovery technology of waste heat from converter flue gas. Sensible heat resources of 200℃-900℃ in flue gas are recovered by waste heat recovery device, and ceramic fiber filter is used for flue gas purification, the whole process does not require water spray and steam, and the steam recovery amount of tons of steel is increased by about 60 kg. Reduce the water consumption of tons of steel by 0.4-0.6 cubic meters, and the treated flue gas dust content meets the ultra-low emission requirements.

In addition, MCC Jingcheng original sintering flue gas constant temperature composite cycle waste heat recovery technology, aiming at sintering process flue gas sensible heat and cooling exhaust gas waste heat utilization, can achieve sintering flue gas and cooling exhaust gas dual heat source balance complementary heat, generating capacity up to 25kWh tons of sinter. In terms of converter flue gas heat recovery, MCC Jingcheng has developed a complete set of high-efficiency long-life technology, which can recover 90kg-120kg steam per ton of steel, and the service life of vulnerable sections such as active smoke hoods can reach more than 3 years, and the waste heat recovery amount is 10%-20% higher than that of traditional technology. In terms of ultra-high parameter gas power generation technology, it has achieved full coverage of single superunit, double superunit and sub-critical unit performance in the steel industry. In the field of energy saving of metallurgical heating furnaces, ultra-low nitrogen burners and combustion systems and whole-furnace intelligent control systems have been developed, which can save 3%-8% of energy. The above product indicators have been at the leading level in the industry.

Enhance the level of scientific and technological empowerment polishing green intelligent ecological background color

In recent years, MCC South has continued to promote the deep integration of the Internet, big data, artificial intelligence and the steel industry, and built a new green intelligent manufacturing integrated technology system with the whole production process, comprehensive management, and the whole life cycle of products, accelerating the process of carbon reduction and carbon reduction, leading to the peak of carbon and carbon neutrality.

The fuel ratio level of blast furnace iron-making process determines the carbon dioxide emission intensity. MCC South Intelligent blast furnace system will open the blast furnace smelting "black box", dynamic display of the blast furnace from the top to the entire production process, and has evaluation, diagnosis and early warning functions, to achieve "intelligent perception - intelligent analysis - intelligent decision - intelligent execution" scientific closed loop. After the successful application of the system in Ningsteel, WisCO and other enterprises, it will show the effect of furnace top distribution in real time, accurately obtain the airflow state, timely diagnose the abnormal operation furnace type, reduce the fuel ratio of blast furnace, and significantly improve the gas utilization rate.

The South automatic steelmaking technology of MCC adopts the control model of "static model + sub-gun detection + dynamic model", which has been successfully applied in many projects such as WisCO, Shougang, Liugang, Indonesia Dexin Steel, etc., which can effectively reduce the amount of molten iron and improve the utilization rate of scrap steel resources, so as to achieve carbon emission reduction.