| 1.1 Design Principles of Sintering Automatic Control System □ Considering the features of similar system at home and abroad, and specific situation in domestic sintering plant, work out the design proposal of Electrical-Instrument-Automatic system. Features are reflected in possibility of improving online, advanced, rationality. □ Ensure reliability of device, the system use the advanced computer and PLC, foreign hardware equipment, considering selection and subscription for the interface to existing equipment, besides the repair & maintenance, spare parts, support services and training should be considered. □ Fully absorbed years project experience, design and develop new systems to meet the company’s future technology development, production and information management needs, meantime, taking into account the facilities for system expansion and upgrading. □ Working out the overall plan and action program. 1.2 Functions of Sintering Automatic Control System Sintering automatic control system is consisted of computer, instrument control and electrical control, which functions are: □ Through communication devices, computers collect production process data, handle the data and output control order. Main functions: collect the information of iron water and scrap steel, static and dynamic blowing control, production plan control, report printing and so on. □ Functions of instrument system: detect and control parameters (pressure, temperature, flow, unnecessary, ingredient), weighing of raw materials. □ Electrical system is used for controlling the pump station: belt conveyor control, raw materials input control, the three machines (sintering machine, round stick feeder, annular cooler) security interlock protection. According to product process and operating requirements of converter furnace, the whole process automatic control system adopt existing mature computer control system. Basic grading cores are PLC and HMI, using network technology constitute the controller-based distributed control system, complete electrical transmission control and instrument process control. Electrical-Instrument-Automatic information sharing and coordination among systems, achieve the purpose of automatic control, monitoring and management. 1.3 Functions of Sintering Automatic Control System Key processes of the system: □ Fuel feeding and broken system □ Ingredients mixed system □ Granulation system □ Sintering, cold screening, back to mine and end product system □ Nose dust removal system □ Tail dust removal system □ Ingredients bag dust removal system □ Fuel bag dust removal system □ The iron feeding material system □ Main air blower system 1.4 Sintering Automatic Control System Network Topology
□ Electrical & instrument equipment and control computer of the main process line form a unified information system, which control dispersed EIC integration system. □ The system uses computer grading control, which contains two grading, the basic automatic grading (equipment automatic control level) and process control grading (monitoring level), building the process production database and historical data records, creating the conditions to improve the production technology. □ The automatic system uses open architecture, has good scalability. □ The automatic control system focus on automatic operation, considering using kinds of CRT manual back-up means to make sure process production normally. □ Instruments and electrical equipments integrate, easy maintenance, least equipments. □ Low Cost Automation (LCA), basic automatic grading, use powerful Siemens S7414-2 PLC control system, the Advantech IPCs are used for process control grading, with universal software supporting, compact and effective functions. |
