New progress in application of converter automatic steelmaking technology

　　Under the background of the continuous improvement of industrial control technology and the rapid development of computer network technology, the level of automatic control technology of converter steelmaking has also been significantly improved. Compared with the traditional converter steelmaking technology, the automatic control technology of converter steelmaking fully calculates and analyzes various parameters such as oxygen lance blowing height, oxygen blowing amount and solvent addition amount by using two-level computer according to the type of steel smelting, temperature and weight parameters of molten iron. Then through the analysis of the dynamic model adjustment data, the purpose of automatic control of the steelmaking process is achieved.

　　1、 Advantages of furnace automation Steelmaking Technology

　　As the most advanced technology at the present stage, the converter automatic steelmaking process technology has the advantages that it can improve the production capacity, shorten the tapping and smelting time, accurately control the dynamic oxygen blowing, reduce the consumption of molten iron and additives, improve the smelting effect and working conditions, improve the utilization rate of equipment, and reduce the production and operation cost; In addition, the application of this technology can also play a role in protecting the environment and saving resources. In the past ten years, the fully automatic steel-making technology has been widely used in large and medium-sized converters. The domestic key iron and steel enterprises have also optimized and improved the original automatic steel-making technology. The large and medium-sized iron and steel enterprises have also developed and applied more advanced automatic steel-making technology, which has achieved good results and economic benefits. For example, Laiwu Iron and Steel Co., Ltd. has made large-scale steelmaking 4 # converter capable of automatic slag splashing through vigorous innovation, which is a major breakthrough in fully automatic steelmaking technology.

　　2、 Progress in application of furnace automation Steelmaking Technology

　　1. Transformation of converter auxiliary gun system

　　At present, China's converter auxiliary gun system has gradually developed towards the direction of independent transformation and research from the traditional method of relying on import, and this technology has already possessed certain independent intellectual property rights. For example, in China's iron and steel enterprises, Baosteel No. 2 steel works imported from Kawasaki heavy industries in Japan. Some parts of the auxiliary gun system of No. 4 furnace and No. 5 furnace, which require low technical level, are manufactured by relevant units in China, while some advanced key components are still manufactured by Kawasaki heavy industries. Some problems were exposed in the sub gun system of some converters during the actual operation, and these problems were solved to a great extent after the subsequent improvement.

　　2. Problem overview

　　First, there are many links that need to be operated, and the actual rotation at the probe installation and extraction station can only rotate at an angle of 33 °. Moreover, there is a certain conflict between the emergency repair of the converter auxiliary gun equipment and the actual production process, which also has a negative impact on the converter production; Second, many links in the control system and operating system are complex; Third, during the design period, there are certain defects in the installation of the probe and the extraction device, and the automatic installation of the probe is often unsuccessful; Fourth, in the process of installing and extracting the probe, it needs to consume a long measurement period.

　　3. Overview of transformation methods

　　First of all, the process needs to be reformed. The maintenance platform of each layer of the converter auxiliary gun operation system is rearranged, and the standby position previously set in the system is cancelled. Secondly, the equipment is reformed. Reasonably adjust the position of the electro-hydraulic cylinder receiver in the converter auxiliary gun, and provide the probe with functions such as gripping while retaining the function of the lifting device that the previous probe can play; The function of the probe in the tank structure is modified, and the tank chute pattern is changed to the straight groove pattern. Cancel the previously applied manipulator, and then add a device that can be used for probe extraction. After the sampling operation for the sub gun is completed, the probe installed on the gun body can be removed by automatic method. The chain drive method is adopted to transform the probe conveying device, the probe is installed under the storage tank, and the slide pipe function of the probe is redesigned and manufactured. Thirdly, the operation steps are optimized. Since the process and equipment have changed to a great extent after the transformation, the operation process should be adjusted accordingly. The process of the auxiliary gun system after the transformation is shown in Figure 1 below:

　　Finally, the control system is reformed. The software and hardware system of the control system are reformed to make the system more compatible with the requirements of the convenience of automatic steelmaking operation.

　　4. Overview of transformation effect

　　Firstly, the measurement period of the secondary lance of the secondary blowing converter has been obviously reduced after the transformation; Secondly, the maintenance cost and maintenance time of the equipment have been significantly shortened; Thirdly, the success rate of automatic probe installation is significantly improved, and the number of manual probe installation is significantly reduced; Fourth, the operation procedures have been significantly optimized, the aesthetic effect of the operation interface has been improved, and the contents of the human-machine communication interface are more humanized; Fifth, the scope of application of the converter includes the function of producing silicon steel and other cutting-edge steel; Finally, the success rate of the test was significantly higher than before, exceeding 99%.

　　3、 Overview of functions and models of process control system independently developed by converter

　　1. Research and development process of Benxi Steel

　　At present, the following problems generally exist during the use of some converters in China: first, during the actual production and operation, there are many cases where the measurement information is not standardized. For example, the scrap steel is not classified when it is used in the furnace, the composition content in the raw materials is not accurate, and even the production operation is carried out without detecting the raw materials. The existence of these problems will inevitably affect the development of the model to a large extent. Based on this situation, we must ensure the scientificity and rationality of the structure selected in the process of model development, so as to improve the adaptability of the model; Second, some enterprises often have the problem that they can not guarantee the adaptability and accuracy of the model at the same time. Based on this situation, we must pay attention to the adaptability of the model during the design of the static control model, and pay full attention to the accuracy of the model when designing the dynamic model; Third, because the production capacity of steel-making equipment in China is enough to meet the production requirements of converter auxiliary gun technology, we should make full use of independent intellectual property rights to promote the progressiveness of the system and strengthen the core competitiveness of Benxi Steel in the market economy system.

　　2. Overview of R & D of Meishan Iron and Steel Co., Ltd

　　Meishan Iron and Steel Co., Ltd. has made some independent research and development on automatic steel-making technology. In the second steel-making project of Meishan Iron and Steel Co., Ltd., the automatic steel-making technology has been applied to a certain extent by means of independent integrated design, and the results have been relatively successful. The integrated design includes: first, the static grouping method and the self-learning grouping method shall be carefully refined in full combination with the requirements of converter smelting steel and the actual conditions of molten iron, and the specific range shall be set in strict accordance with the conditions of self-learning furnace, and the relevant rules of self-learning shall be reasonably improved; Second, reasonably optimize and adjust the relevant smelting parameters in the main raw materials, standardize the operation methods of each link during the converter period, vigorously apply intelligent and automatic methods to control, significantly reduce the occurrence of human intervention, and effectively improve the self-learning function and reproducibility of the static model; Second, for the point to be blown and the oxygen point in the switch, the speed of the regulating valve and the oxygen gun and the time of opening and closing the valve are adjusted; Third, control technology is added in the process of adding converter by-products.

　　3. Study on dynamic and static model parameters of Magang

　　The 300 ton top bottom combined blowing converter automatic steelmaking system introduced from Danieli Corus company is used in the main project of the new project of Masteel. This system belongs to the steelmaking equipment with high technical level in recent years and is also the most advanced steelmaking technology in the steelmaking industry. In recent years, Masteel has improved its data collection function in the steel-making process, improved the accuracy of basic data, and realized the optimization of dynamic model and static model parameters.

　　The improvement and optimization work includes:

　　First, the management of raw and auxiliary materials has been refined and strengthened, including refining the classification method of scrap steel, specifying the classification method and treatment method of returned slag, and doing a good job in the management of the storage process of returned slag, and properly optimizing the management of converter slag; Second, continuously optimize and adjust the parameters in all aspects of the model, and also refine and adjust the actual speed of decarbonization. In combination with the process and results of dynamic blowing calculation, adjust and refine the cooling effect of the ore, correct and refine the specific tapping time and actual tapping temperature, and reasonably improve and optimize the process window of the main blowing target; Third, the data processing function and data transmission capability in the primary and secondary systems were effectively improved, the accuracy of data was further strengthened, and the accuracy of loading calculation was optimized again.

　　4. Research on Optimization of automatic steelmaking technology in WISCO

　　At present, more and more enterprises in our country have introduced the computer dynamic control method of converter auxiliary gun, and after the application of this system, the auxiliary gun and automatic steelmaking control system have played an excellent role. However, during the actual application, some problems are still exposed, such as: first, the management level and equipment maintenance capacity are far from the production demand, and manual intervention is often required. During the actual application of the steel-making management mode, there is a mismatch with the demand of computer automatic steel-making, and the equipment often fails; Second, the metering capacity of converter smelting process is insufficient, and the reasonable classification of raw materials cannot be realized; Third, there are certain defects in the actual production period, and the smelting model is not perfect.

　　The equipment and technology used in the fourth branch of the general steelmaking plant of WISCO are relatively high, and the production technology level of the plant is also the most advanced level in China. The methods to optimize the production process include: first, optimize the stability performance of the converter auxiliary gun for the actual operation, and effectively improve the actual stability effect of the static process, and appropriately strengthen the c-wenshuangming middle road; Second, adopt reasonable methods to quickly add coolant to the converter; Third, improve the stability of the oxygen supply system during operation. In addition, the third branch of WISCO steelmaking plant has also optimized the production technology. For example, without changing the external raw material conditions and production mode, the dynamic and static models and pre tapping models have been reasonably improved, the automatic carbon drawing technology has been continuously optimized, and the technical level of rapid tapping has been continuously improved.

　　After the application of automatic steel-making technology and converter auxiliary gun, the traditional steel-making enterprise has changed the mode of steel-making based on experience for a long time. Moreover, the application of this technology has greatly improved the informatization level and operation standardization of steel-making production management, and promoted the improvement of data collection function. It also promotes the optimization of the data collection function, promotes the improvement of the accuracy of the basic data, optimizes the dynamic model parameters and static model parameters, and effectively reduces the level of resource consumption and energy consumption, which is of great help to the improvement of the development level of new steel. The method of introducing foreign advanced technology to develop the steelmaking industry, It has also gradually transformed into a method of promoting the development of the steel-making industry through independent research and development, further improving the overall technical level of steel-making.