I. Scientific and technological achievements of "research and innovation on key technologies of high-efficiency, low-carbon and high-air-temperature wind stoves".

Second, in the context of green and low-carbon development, the project focuses on the common technical problems such as efficient combustion, ultra-low emission, safe and stable operation of blast furnace hot blast stove, and develops a new type of top-fired hot blast stove with high efficiency and low carbon, green and clean, high temperature and long life, and key technologies. The main innovations are as follows.

1. High-efficiency, low-carbon, high-air temperature top-fired hot air furnace and its key technologies are developed and applied. Proposed a new generation of top-fired hot air furnace based on the optimization of the dissipative structure of efficient and clean combustion theory, invented the top-fired hot air furnace three-dimensional swirl diffusion combustion technology and ultra-high-power high-efficiency cyclone diffusion burner, the single combustion power of 180MW. integrated and innovative high-efficiency low-carbon clean combustion and efficient conversion of energy and key technologies, CO combustion dissipation rate of less than 20 ppm, the thermal efficiency of the system reaches 85% or more. The thermal efficiency of the system has reached 85% or above.

2. Innovative development of high-efficiency, low-carbon and clean combustion technology for top-fired hot air furnace. Using multi-field coupled numerical simulation, physical modeling experimental research, thermal semi-industrial test research, hot stove actual operation test research and other research modes, research and analysis of three-dimensional vortex diffusion combustion type of high-efficiency combustion combustor gas diffusion, mixing, mass transfer and combustion process, invented based on the cyclone high-efficiency combustion, strengthened diffusion and mixing, low nitrogen oxides and low air excess coefficient of the ultra-high-power combustion burner. Under the condition of wind temperature of 1250°C, the fuel consumption of hot blast stove is reduced to below 1.14GJ/ t (converted blast furnace gas consumption of 370Nm³t), and the NOx and CO emissions in the flue gas of the hot blast stove are reduced to above 50mg/Nm³ and 20mg/Nm³ respectively.

3. Created a new type of top-fired hot stove refractory design, manufacture and configuration of technical standards system. After the study of the service after the hot stove refractory damage mechanism, put forward to improve the service performance and safety and reliability of the technical solutions; optimization of the design of the key parts of the hot stove refractory brick structure, physical composition, thermal parameters, etc.; developed a series of creep resistance performance of the series of high-efficiency lattice bricks and high-temperature thermal shock resistance of the mullite - rhodochrosite - dungite bricks, the development of ceramic burners, high-temperature hot air pipe Key technologies such as casting, prefabrication and combination of refractory materials have been developed and put into large-scale production and application.

4. Developed low-stress - no overheating hot stove furnace and piping long life technology, designed and developed low-stress hot stove furnace and hot air piping system. The research analyzed the mechanism and law of local overheating, stress corrosion fatigue cracking and breakage of key parts such as shell, refractory material and hot air pipe in the high temperature zone of large hot blast furnace, adopted new corrosion-resistant stainless steel-high-strength alloy steel composite shell structure in the top-ignition hot blast furnace of 5500m³ blast furnace, developed corrosion-resistant - low-stress shell construction technology, and established intelligent monitoring, evaluation and so on, which are used for the elimination of post-soldering residual stress in the shell, the furnace and pipeline, and the design and development of low-stress hot blast furnace and hot blast piping. and pipeline intelligent monitoring, evaluation and other technical systems.

5. Developed the hot blast stove combustion dynamic precise control model and intelligent information physics system (CPS) hot blast stove body and piping system all-weather intelligent monitoring system. The energy efficiency ratio index of hot blast stove was proposed, laying the foundation for high efficiency and low carbon, energy saving and emission reduction of hot blast stove, and improvement of energy efficiency evaluation standard. Through digital control, the precise control of gas and combustion air flow rate hot blast furnace vault temperature, air supply temperature, flue gas temperature and composition is realized. The blast furnace wind temperature is stabilized to more than 1250°C, the energy efficiency ratio of the hot blast furnace is ≤1.15, the excess coefficient of combustion air is ≤1.02%, and the difference between the hot blast furnace vault temperature and wind temperature is ≤100°C. The hot blast furnace has a high efficiency and low carbon emission reduction, and it has laid the foundation for improving the energy efficiency evaluation standard.

Third, the results have been authorized 37 invention patents (including 4 international patents), the development of national and industry standards and specifications 10, published more than 60 academic papers. The technology has been applied to more than 240 blast furnaces and 780 hot blast furnaces at home and abroad, such as Shougang Jingtang No.3 5500m³ blast furnace, Qiangang No.2 blast furnace hot blast furnace upgrading and renovation, Zhongtian Iron and Steel, Baowu Meigang, Hesteel Serbia Iron and Steel, and MMK Iron and Steel, etc., and has achieved remarkable economic, social and environmental benefits, and has a bright prospect of application.

II. "large-scale high air temperature top-fired hot air furnace technology and equipment development and application" scientific and technological achievements

Second, improving the hot blast furnace air temperature is one of the important directions to realize energy saving and emission reduction in contemporary blast furnace ironmaking. The project has developed large-scale high air temperature top-fired hot blast furnace system technology and equipment and materials through collaborative innovation in research, engineering design and material manufacturing, and has achieved the following results:

Developed a dynamic and accurate design system for hot blast stove, realizing the systematic optimization of structure and material design for large-scale top-fired hot blast stove; developed and applied two-stage double preheating technology, realizing the high-efficiency utilization of low-quality gas; under the guidance of the coupling research of flow field, temperature field, pressure field, etc., developed the diffusion-type high-power high-burner with the advantages of uniform distribution of airflow velocity and concentration, complete combustion of gas, and low emission of CO and NOx. ring ceramic burner, completed the design and manufacture of a series of small-hole lattice bricks, and The design and manufacture of a series of small-hole lattice bricks have been completed, which eliminates the phenomenon of high local stress and overheating commonly found in pipeline systems; the configuration and performance index system of refractory materials for the top-fired hot stove have been created, three national and industrial standards have been formulated, and the core technology of key refractory materials has been formed.

Third, The results were firstly applied to Shougang Jingtang 5000m-class blast furnace, and achieved a wind temperature of 1300C with a fuel ratio of 480kg/t. The results were also applied to Anshan Steel, Baosteel, and Baoji Steel. The results are also successfully applied in many large and extra-large blast furnaces of Anshan Steel, Baosteel, Baotou Steel, Tangshan Steel, Xingcheng Steel and other factories, with obvious economic, environmental and social benefits.

Suggestion: For blast furnaces of different sizes, serialize and accelerate the application of this technology.