| Steel is one of the most important raw materials in modern society. Steel Industry, as well as is one of the pillar industries of a country. In steel plant blast furnace is the main equipment to produce molten iron, which is the major raw materials of steelmaking. As an important basic equipment in a steel production line, the blast furnace is needed to supply molten iron timely and stably. Take on the reasons of the large size, complex production process, large amount of raw materials, high operating rate and the request of longevity, the operation of blast furnace is complicated . And the blast furnace is closed, it is necessary to use many detection instrumentations to monitor the internal situation. Therefore the application of automation has become an inevitable trend in ironmaking production.The task researches the new-build project of 4# blast furnace's feeding control system design in JIYUAN STEEL&IRON Co. Referring to a lot of correlation literature domestic and overseas, taking the enterprise's actual status as a basis and combining modern blast furnace's control technical and developing trend, we obtain the control system program with optimum cost-effectiveness. The new control system uses IEC equipment integration, in which basic automation uses PLC method, process automation uses IPC, and production process monitoring is realised with industry control configuration software.With the Siemens PLC S7-400 and the corresponding programming software Step 7 that helps in control software programming, the blast furnace's feeding control system meets the requirements of automatic material proportioning, weighing, loading and distribution, and the requirements of the interlocking and sequence control.And we use WinCC, which is also a product from Siemens, to configure the blast furnace's feeding system, and design various visual HMI with Windows features ,with which we can realize the supervising and controlling, dynamic simulation, real-time data-logging, record checking, alarming of the production process.Feeding Control PLC, the IPCs in the scheduler room, and the field devices are linked together via Profibus to form a hybrid feeding control system, with which other parts of the control system components blast furnace control system through Industrial Ethernet.The control system overcomes many inadequates of the traditional relay control system, and accesses a more accurate control, higher efficiency, better reliability, lower failure rate. Thereby the blast furnace's production level of technology and economic indicators are substantially raised.
|
PDF Full Text Request