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  • Towards automatic control of slab-reheating in pusher-type furnace in ACRONI d.o.o.
    Vode, Franci, 1978- ; Jaklič, Anton, 1970-
    In hot-rolling plant of ACRONI d.o.o. steelwork steel slabs are reheated in a pusher-type furnace. Application of slab-reheating control (level 2) of pusher-type furnace in ACRONI is underway, here ... we present its concept, main features and technical solutions. The furnace is equipped with on-line mathematical model of slab reheating process, which is the cornerstone of model-based slab-reheating process. The model calculates distributed slab temperature, which enables slab-temperature control according to the desired reheating parameters. The model is firstly used off-line for determination of reference reheating curves (RRCs), which are stored in a table of MyAQL database. The RRC for cold slab charging are determined by simulation of mathematical model, where reheating parameters are set as prescribed by technological rules. The RRC for higher initial temperatures (100, 150, 200, ...)oC are determined using developed furance control system. The RRC for both, cold and hot charging, consider furnace geometry as well as furnace limitations. The furnace zone-temperature limitations are considered in this phase as well as during on-line control. The RRC for each charging type is defined separately for virtually `lower` and `upper` half of slab. Tracing of RRC of each slab is obtained by dynamically setting appropritate reference of level 1 zone-temperature regulators in all zones. Drop out interval is feed-forwarded dynamically in that way, that each slab finishes reheating according to its RRC at a time, when it is discharged from the furnace, and where beside this are considered all kind of delays in production line including delays due to synchronization with rolling mills. The main feature of the used slab-reheating system is that it enables closed-loop slab-temperature control according to the predefined RRC during normal operation as well as during all kind of delays. The control system is implemented using C programming language, MySQL C-API for accessing MySQL database, altogether running on standard PC with SuSE linux operating system. The data transfer from main process computer to slab-reheating-control-system computer and vice-versa are TCP/IP sockets, which demonstrated fast and reliable data transfer during tests.
    Vir: Program in knjiga povzetkov = Program and book of abstracts (str. 27)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2008
    Jezik - angleški
    COBISS.SI-ID - 59856

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