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| Application on one-key alloy feeding optimization system for steelmaking process of 90 t EAF |
| LI Bo1, YANG Ling-zhi1, SONG Jing-ling2, GUO Yu-feng1, LI Zhi-hui1 |
1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China;
2. Steelmaking Branch, Hengyang Valin Steel Tube Co., Ltd., Hengyang 421000, Hunan, China |
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Abstract EAF steelmaking process is the important process on steel industry transformation path, as the standard of special steel components increasing, the higher requirement of composition control for EAF steelmaking in iron and steel enterprises has put forward, and alloy feeding EAF steelmaking process is one of the important means for regulating composition. Because of alloy type and quality needed in different steel grades during smelting are different and the price of alloy is not average, therefore, alloy cost is always been an important part of the production cost of EAF steelmaking. At present, the alloy feeding operation process of 90 t EAF steelmaking process in Hengyang Hualing Steel Tube Co., Ltd., relies on the experienced technical staff, and does not fully consider the difference of alloy element yield for different steels. The fluctuation of price and composition of alloy raw materials in different batches results in less control of narrow composition, more frequency of alloy feeding and high alloy cost. In order to solve this problem,based on the dynamic database of alloy element yield rate and the two-stage simplex algorithm, the influencing factors of alloy feeding process were analyzed in the article. Using SQL database, Visual Studio 2013 development platform and OPC interface technology, the alloy feeding optimization system with one-key operation was developed. The calculation results of the system were transmitted to PLC to realize the one-key alloy feeding operation. The system operation results show that the alloy element yield rates of different steels are optimized. The alloy allocation ratio in the ladle after EAF tapping increased from about 73.88% to 85.11%, compared with the whole steelmaking process. The system calculation cost of alloy feeding in ladle after EAF tapping reduced 6.32%-8.07% and the system calculation cost of alloy feeding in LF reduced 1.04%-22.59%. The total cost of EAF steelmaking process decreased by 1.53%-10.02%.
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Received: 26 August 2021
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2022, Vol. 57 
