The Grinding Process Optimization Control And Information Integration Applied Research

The grinding process automatic control, benefit optimization and information integration in metallurgical industry was studied in detail and a proper solution method was provided in the paper. The solution has been used in the integrative automation project of MeiShan Concentration Plant, Shanghai BaoShan Steel Group.The grinding is an important process in mineral beneficiation, in which the main control objective can be stated as maximizing the throughput subject to maintaining the product size within an allowable range. Grinding system is a complex multi-variable, nonlinear and large time lag system. According to the control objective and the characters of the grinding system, a cascade control scheme was given out on the basis of analyzing system model. In the subsystems, the product size control relating quality and mineral feeding control relating throughput were discussed on emphasis. The fuzzy strategy was used in the former and the optimization strategy was used in the latter. The complex control strategy worked well as the system shown in real running condition.The grinding optimization objective can be considered a problem of economic optimization with constraints. Step-searching self-optimizing method was adopted in solving optimization and the robustious distributed optimization was adopted in the strategy, which allowed the system run in the optimization state.The information integration basing on the database, the application of industrial Ethernet and Web technology in the distributed control system was studied also.On the basis of fully study the grinding optimization control and information integration, the three levels solution in the grinding DCS was giving out , which was made up of Controlling Level, Supervisory Control Level and Management Level.The realities show that the grinding process optimization control system runs well economically and robustiously, which not only can be adapted to the industry of metallurgical but also have great significance to the automation and information renovation of the other old industries.