Design And Implementation Of DCS System On Rectangulararc Furnace

Since the invention of electric arc furnace, it has become the core of themetallurgical industry equipment, due to its compared with agile process, goodeconomy, and its high yield and high quality characteristics, more and more getpeople’s attention. The emergence of rectangular electric arc furnace, it is thetechnology of great development, rectangular arc furnace with special characteristics,its appearance is on the kinds of rectangular section, electrode is a word is arranged,furnace sealed structure, auxiliary equipment many and complicated, in smelting, dueto its closed space, furnace temperature high fluctuation small easy to control, caneffectively remove impurities, liquid steel stable quality is good, be helpful forsmelting including oxide more steel grade.DCS (distributed control system) used in electric arc furnace system has a longhistory. DCS was first appeared in1975,30years, each manufacturer has successivelydeveloped from protecting intellectual property rights of the DCS, DCS technologyhas been greatly improved, its application field is also rapidly expand, food,metallurgy, energy, medical, chemical industry and so on are successively into DCS toimprove production and service level, in the smelting industry, DCS is graduallybecome the indispensable system. DCS by process control level and processmonitoring level of communication network as a link to the multiple computersystems, integrated into the computer, communication, display and control4ctechnology, its basic idea is to decentralized control, centralized operation,classification management, configuration agile and convenient configuration. Arcfurnace system is complicated in structure, equipment diversity, cost and energyconsumption is very high, there are a lot of safety risk, the system control accuracyrequirement is very high, because of its each subsystem relative dispersion, such ashigh voltage substations and batching system station, environmental protection station,electrode control station are set is spread, the traditional computer control system can’tmeet the modern large-scale arc furnace process requirements and production requirements, and many of the DCS is a control system of electric arc furnace the bestchoice.In this paper, for example, panzhihua jinjiang titanium industry30000kvaelectric arc furnace system is the Asian largest rectangular arc furnace, the system ofhuge, DCS design and puts forward the very high request, arc furnace hardwareequipment, a lot can be divided into11small system, including：Superiority system,electrode system, charter system, slag car system, slag system, cast system, furnacecover system, furnace wall system, furnace system, water system, inert gas system, etc.The electrical system is very complicated, including low voltage control cabinet,operating console, electrode control system, computer system, hire control system,etc., other all sorts of electrical equipment is large Numbers.In the design of DCS, fully consider the arc furnace system equipment diversity,signal transmission of real-time, control process, and the accuracy of productionmanagement efficiency. The DCS chooses is Siemens SIMATIC PCS7, PCS andsystem for industrial automation and control to provide a broad range of hardware,software, configuration, configuration and diagnostic tools. PCS and the project is inthe PCS and engineer website design, engineer station equipped with PCS andconfiguration tools, can and automation station and operator station communication.The control system structure is mainly divided into two stage three layer, two stagefor workshop level and ChangJi, three layer is divided into the control layer, operationmonitoring layer, superior management, control layer and monitoring layer belongs tothe workshop level DCS, responsible for production process monitoring and control.As the core of the rectangular arc furnace control part, electrode regulation controladopts PID, DCS Network communication scheme design for optical fiber redundanttopological structure, which can guarantee the core part to high speed, safety andreliable data transmission, PC uses KingView design human-machine interface of thesystem to connect the operator and control station, guarantee the accurate controlcommands and data to monitor the real-time accurate. The DCS system has the designwas finished, and the rectangular arc furnace verified that the rationality of the designand reliability.