Hits:

Indexed by:期刊论文

Date of Publication:2009-12-01

Journal:INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS

Included Journals:SCIE、EI、Scopus

Volume:16

Issue:6

Page Number:626-631

ISSN No.:1674-4799

Key Words:mathematical model; slab temperature; dynamic control; continuous casting

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.