| In order to raise continuous casting ratio, improve product quality, decrease power consumption, fit in with the changing needs of the internal and external markets, PANGANG Iron and Steel (group) CO. decided to invest a fall continuous casting construction project. This project includes one billet continuous casting machine , one 2# slab continue casting machines, two LHs (ladle furnaces), one RH vacuum. The function of LH is to provide molten steel qualified both in temperature and composition for continuous casting and the RH processing. The writer of this thesis is the chief engineer of this project. The process of LH and the electro-mechanic characteristics of the main production devices are described first. Then the control requirements of the process are analyzed in detail. The thesis gives deep studies on how to use modern control technologies, computer network technologies, field bus technologies, electrical drive technologies, etc. in the control system design in order to make the LH control system come up to the advanced world level. A n LH control system structure, based on high speed Ethernet, field bus, programmable logic controllers and general purpose PCs, is proposed.　 After analyses of the key control elements-temperature and composition, the thesis gives detailed design of the main system control functionalities: electrode control system, alloy material adding control system and operation monitoring system. Multiple factors, such as Cost, maintenance, reliability and advanced levels, are always keeping in mind during the process of the control system design.　The constructing of LF in PANGANG Cooperation will decrease the cost of steel production and equipment maintenance, reduce the labor of workers, and provide convenience for future improvements for steelmaking. The great economic profits and social effectiveness will be achieved after the system goes into operation.
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