Analysis on operational efficiency of steelmaking-continuous casting section based on process simulation
The operational efficiency of steelmaking-continuous casting section(SCCS)has a significant impact on the efficiency-stability and collaboration-continuity of steel manufacturing process,since it is a key section.How to further improve the operational efficiency of SCCS is an important issue for the steel industry in the context of"car-bon peaking","carbon neutrality".A domestic BOF-based steelmaking plant as the research object was taken,and Python tool was used to construct a model for simulating the operation of SCCS in terms of the analysis of actual pro-duction data.The effects of scheduling rules and other factors on the operational efficiency of SCCS are systemati-cally studied using the simulation model,and the evaluation of results are carried out by using indicators of the turn-over time of ladles,the turnover number of ladles,the time from tapping to casting,the total waiting time for turn-over process and makespan.In addition,the operational efficiency of SCCS under modes of the high scrap-ratio BOF smelting and the centralized production of LF-based steel at night are preliminary studied,based on the urgent requirement of low-carbon and low-cost production.The results indicate the order of factors influencing the opera-tional efficiency of SCCS is scheduling rules>the matching of processing time>the fluctuation of processing time.The current scheduling rule based on the earliest available equipment adopted by the studied steelmaking plant is more effective than those based on one-furnace to one-caster and the balanced equipment operation rate.By using the scheduling rule based on the shortest transfering time,the operational efficiency of SCCS can be further improved by narrowing the fluctuation range of refining time.The mode of"one BOF used for high scrap-ratio smelt-ing+two BOFs used for normal smelting"is feasible for the studied steelmaking plant.It is advisable to control the heat ratio of high-scrap ratio to 15%for ultra low carbon steel,and to ensure operational efficiency,it is necessary to match the processing times of different processes.The availability of the centralized production mode of LF-based steel is influenced by continuous casting heats significantly.For the studied steelmaking plant,it is suggested to con-trol the heat number for continuous casting to 8-12 and 6-9 respectively for typical low carbon and peritectic steels.The process simulation method proposed shows a high universality and can be used to study the operational efficiency of ironmaking and rolling sections as well.
process simulationsteelmaking-continuous castingoperational efficiencyinterface technologyscheduling rulesprocessing time matchprocessing time fluctuationhigh scrap-ratio
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