The Design And Application Of Blast Furnace Blower Control System

In metallurgical corporation, blast furnace air blower is very crucial and complex facility. To ensure its stable, high efficient and safe work, designing and realizing computer control system is very important. This paper analyzed and researched control system in architecture and control method, integrating blast furnace's feather. This paper focused on optimizing blower control system from different links consisting loop, such as signal acquisition, signal analysis, PID control, output control, safety protection etc. optimized control system raised controlled resolution, satisfied blower running with reliability, safety and stability, and guarantee blast furnace's expansion and increase of production.Blower control system is majored in logic control and interlock control. From this point, PLC which has strong logic control function is a desired choice. From performance, PLC product has strong handling ability in analog signal and stability, and can meet this control system's request to analog signal and stability. From system architecture, PLC system is compatible with Industry Ethernet network protocol, providing more space for communication between systems and expansion. Therefore, the choice of PLC system as main part of control system gave attention to two aspects: equipment investment and control effect.Detailed research, design and improvement involve hardware framework and control model's application of blower Simens S7-400 control system and monitoring and operating each other among 5 control systems by network communication.1. The design of PLC control system hardware frameworkAdopting Simens's large scale and pop PLC control system S7-400 as major part of control system, system realize major function, such as start, revision, adjustment, stop and security protection etc. updating signal acquisition device and actuator controlling output and so on, entire control system was optimized from field to control system. 2. The design of Control model in control systemControl system adopt a lot of advanced control technology and control thinking, such as variable gain anti-surge adjustment, decouple control of stationary blade and anti-surge adjustment, 2/3 decide of important signal, and cascade control. These control thinking guarantee safe and reliable running, and expand operation region of air blower.3. communication among control systemsIn monitor layer, information is delivered through switch and fiber optic transceiver among new S7-400 control system and 4 others, according to Industry Ethernet protocol standard. Network of 5 control system realize monitoring and operating 5 blower in each control console, improving automatic control level of plant and labor productivity.Computer control system of blast furnace blower combined with research work ofthis paper has been operating for half year in one Iron& Steel group with stableperformance and good control effect.