A few days ago, the 2015 China Iron and Steel Industry Association, China Metal Society Metallurgical Science and Technology Award professional evaluation recommend award-winning projects were publicized. Among the 12 projects that won the first prize, the project "Research and Application of Key Technologies for High Blast Temperature in Super Large Blast Furnace" ranked first.

This project completed by Beijing Shougang International Engineering Technology Co., Ltd., Shougang Jingtang Iron and Steel United Co., Ltd., Zhengzhou Annike Industrial Co., Ltd., and Beijing University of Science and Technology shows that the research and application of key technologies for high blast temperature of super-large blast furnaces in my country New important results have been achieved, and the high blast temperature technology of blast furnaces in the steel industry has made considerable progress.

In this regard, as one of the few R & D representatives of hot blast furnace integrated service enterprises in addition to iron and steel enterprises, Li Fuchao, chairman of Zhengzhou Annike Industrial Co., Ltd., introduced in an interview that the achievement was identified as the international leading level and won the first prize of Henan Science and Technology Progress Award; after preliminary examination and on-site defense, it has been officially awarded the first prize of 2015 Metallurgical Science and Technology Award. He believes that China's blast furnace hot blast stove technology has been rapid development. As a unit engaged in the research and development of blast furnace hot blast stove technology and related products for a long time, the fourth-generation new top-burning hot blast stove developed by them has attracted the attention of the steel industry and achieved good operating results.

Innovative design makes high air temperature more economical

The hot blast stove is an important auxiliary equipment for blast furnace ironmaking, and the air temperature level and service life it can provide directly affect the production technical indicators and economic benefits of the blast furnace. In order to adapt to the "new normal" of the steel industry, the hot blast stove field must uphold the concept of energy saving and environmental protection, and accelerate the development and application of advanced technology. Zhengzhou Annike Industrial Co., Ltd. combined the characteristics of industrial policies and integrated domestic and foreign resources. In 2013, it developed a new fourth-generation top-burning hot blast stove with better energy-saving and environmental protection effects and completely independent intellectual property rights, breaking through the long-term foreign The technical barriers of the hot blast stove monopolized by enterprises have played a positive role in energy saving and emission reduction, production increase and cost reduction in the steel industry.

It is understood that the fourth generation of new top-burning hot blast stove is a new development of a more advanced top-burning hot blast stove on the basis of summarizing research and analysis of other types of hot blast stoves. The new hot blast stove mainly adopts three-stage independent structure, cone-column composite burner, 37-hole small aperture high-efficiency lattice brick and other core technologies. The new hot blast stove has five core characteristics of "three low and one high and long", namely: low investment, low operation, low maintenance, high wind temperature and long life.

So, how does the new hot blast stove achieve the goal of obtaining high air temperature and more economical?

Li Fuchao introduced that the new type of hot blast stove burner is of cone-column composite structure and adopts the key technology of air and gas space swirl and plane trickle high-speed injection. The air and gas mixing effect is good, the air excess coefficient is small, a shorter flame is formed in the vault space, the combustion is more complete, the air flow is evenly distributed on the upper surface of the lattice brick and the central negative pressure area is reduced, and the efficiency of the lattice brick is significantly improved, conducive to energy conservation and environmental protection and reduce operating costs.

Due to the use of high-power short-flame burner and 37-hole small aperture high-efficiency grid brick, thermal efficiency is fully utilized, the height of the hot stove is lower than other types of top-burning hot stove, can significantly reduce investment costs, is a new type of top-burning hot stove in the new and old hot stove transformation has broad application prospects.

In terms of precise structural design, the 4th generation of new top-burning hot blast stove adopts the burner mixing chamber easy-to-purge, micro-explosion and non-displacement structure, reflux zone rectifying diversion technology, interlocking combustion chamber flat structure, multi-ring interlocking anti-channeling hot air outlet structure, stress-free orifice structure, lattice brick edge brick positioning and inlaying technology, "Z" shaped self-locking closed pipe structure, "combined brick + pouring" three-fork structure, composite furnace grate structure, and cold air mixing technology, hot air pipe expansion and tensioning device, anti-intergranular stress corrosion measures, bottom furnace shell and variable diameter arc connection, hot air furnace symmetrical arrangement arrangement and other dozens of patents and proprietary technologies. According to introduction, the 4th generation of new top-burning hot blast stove can reduce the height of the hot blast stove and increase the vault temperature due to the innovative design based on sufficient basic research, and adopt 37-hole small-aperture high-efficiency lattice bricks, which reduces the investment by 5% ~ 10% compared with the same type of hot blast stove at home and abroad. When the energy medium indexes of hot blast stove such as air and gas temperature and gas calorific value are the same, the vific value of the 4th generation new top temperature are higher, can increase 20 degrees Celsius ~ 30 degrees Celsius air temperature.

In this regard, Wang Weixing, an iron-making expert of the Chinese Society of Metals, gave a positive evaluation. He believes that due to the improvement of the furnace structure, the new type of hot blast stove has uniform mixing of air and gas, high combustion efficiency, saving gas, obtaining high air temperature, improving gas utilization rate, reducing relative air consumption and reducing power system consumption. The successful operation practice of the new type of hot blast stove in relevant iron and steel enterprises has also fully proved this point.

The economic downturn should pay more attention to technological transformation.

Li Fuchao said that in addition to seeking breakthroughs in hot blast stove technology, obtaining high air temperature is also a breakthrough point to extend the life of hot blast stoves-improving the scientific allocation of refractory materials and improving the quality of refractory materials. It is equally important to upgrade internal equipment and innovate management. The steel situation continues to decline. For Anneke, this is a challenge and an opportunity. Li Fuchao believes that at present, the equipment level of domestic refractory manufacturing enterprises is not high, and the per capita production efficiency is also low. There is a gap between the equipment level and management level of foreign advanced enterprises. Anneke still needs to learn and improve in this respect. In the next two years, enterprises will invest more than 2000 million yuan in technological transformation and equipment upgrading. First, we must do a good job in the energy-saving and environmental protection transformation of the overall production system of the enterprise, and continue to maintain the advanced level of leading peers. The second is to do a good job in equipment automation and upgrade, and develop to intelligence to further improve production efficiency and stabilize product quality.

In order to achieve long-term development, enterprises should not rush for quick success and instant benefits, but should attach importance to basic research. Combining the actual development of the enterprise, Li Fuchao believes that if the enterprise wants to truly become the main body of innovation, the focus should be to achieve the "three combinations", that is, the technology and products developed should be closely integrated with the production needs of users, closely integrated with the problems that users urgently need to solve, and closely integrated with the development direction of the industry. In this way, enterprises can effectively improve the conversion rate of technological achievements, such as the recent research and application of the fourth generation of new top-burning hot blast stove, through the technical characteristics of "three low and one high and long", not only help iron and steel enterprises to obtain high air temperature, but also reduce gas consumption and power consumption, and truly achieve both economic and social benefits.

To this end, Zhengzhou Annike Industrial Co., Ltd. focused on the implementation of the "innovation, brand, efficiency, service" development strategy. Li Fuchao said that innovation is the way out and the only way for enterprise development; brand is the embodiment of comprehensive strength, and the value of the enterprise should be reflected through excellent performance and cases; work efficiency is mainly through various innovation and transformation, constantly improve efficiency and efficiency; service is to timely understand and grasp the mentality of users and the problems to be solved, so as to achieve active service, effective service and value-added service.

Sustainable Development by Continuous Innovation

Efforts should be made to solve problems for iron and steel enterprises, rather than simply selling their own products; to accelerate the transformation from product suppliers to hot blast stove integrated technology service providers-this is Li Fuchao's positioning for future enterprise development. And all this depends on continuous innovation.

It is based on the continuous optimization and integrated innovation based on the basic research of the system, closely combined with practice, and continuous and accurate design that Zhengzhou Annike Industrial Co., Ltd. has created a new type of top-burning hot blast stove that is more energy-saving and environmentally friendly and has independent intellectual property rights. It is relying on continuous innovation to achieve sustainable development. From the original production of high-quality refractory materials, they have now developed deeply into the research and development and application of hot blast stove integration technology, and are at the forefront of the industry on the road of innovation, transformation and upgrading. Wang Weixing believes that the most important feature and advantage of the enterprise is that it has a series of core technologies. Adequate basic research and mechanism research, perfect technology and quality assurance system, innovative design ideas, etc., have become a strong support for the rapid development and sustainable development of the enterprise.

It is understood that the enterprise has accumulated rich practical experience in the configuration and design of refractory materials for blast furnace hot blast stove, and has led the drafting and formulation of a number of refractory industry standards. Among them, the project of "top burning hot blast stove refractory material design and its standard formulation" won the second prize of scientific and technological achievements in Henan Province; The development and application of high load soft and high thermal shock resistant bricks for hot blast stove ceramic burners won the second prize of Henan Province, "Top Burning Hot Blast Stove Refractory Material Configuration and Research and Application of AH Series Andaluite Brick" won the second prize of Henan Province Science and Technology Achievement Award, "Research and Application of AH Series High Thermal Shock Resistance Special Andaluite Brick" won the second prize of Henan Province Science and Technology Achievement Award; "Siliceous Honeycomb Lattice Brick" was recognized as "Famous Brand Product of Henan Province".

Energy saving, consumption reduction, environmental protection and elimination of backward production capacity have become the main direction of transformation and upgrading of China's iron and steel industry. In this regard, Li Fuchao is full of confidence. He believes that in the field of ironmaking, the technologically backward internal combustion hot blast stove and the ball hot blast stove with high energy consumption and short life are in urgent need of transformation. The fourth generation of new top burning hot blast stove is the ideal furnace type for new construction and other furnace type transformation. It can be said that the continuous application of the fourth generation of new top burning hot blast stove technology with independent intellectual property rights in China will help to completely break the hot blast stove market monopolized by foreign enterprises for a long time, which not only saves foreign exchange for the country, but also creates considerable economic benefits for customers. In the field of blast furnace ironmaking, it can be more economical, more energy-saving and more environmentally friendly while obtaining high air temperature.