Temperature distribution and dynamic control of secondary cooling in slab continuous casting |
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| Authors: | Liang-liang Guo Yong Tian Man Yao Hou-fa Shen |
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| Affiliation: | aSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China;bAnshan Iron and Steel Group, Anshan 114021, China;cDepartment of Mechanical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | To predict and optimize the temperature distribution of slab continuous casting in steady operational state, a three-dimensional model (named “offline model”) based on the heat transfer and solidification theories was developed. Both heat transfer and flux distribution characteristics of the nozzle sprays on the slab were considered, and the complicated boundary conditions, such as spray cooling, natural convection, thermal radiation as well as contact cooling of individual rolls were involved in the model. By using the calibrated caster dependent model factors, the calculated temperature and shell thickness accorded well with the measured. Furthermore, a dynamic secondary water cooling control system was also developed on the basis of a two-dimensional transient heat transfer model (named “online model”) and incremental PID control algorithm to reduce slab surface temperature fluctuation in unsteady state. Compared with the traditional spray table control method, the present online model and dynamic PID control demonstrate a higher capability and flexibility to adjust cooling water flowrate and reduce slab surface temperature fluctuation when the casting speed is changed. |
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| Keywords: | mathematical model slab temperature dynamic control continuous casting |
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