| During the course of rectifying zinc, the fluid of coarse liquid zinc puts into Pb column from furnace works as a key technical parameter. Whether the fluid of coarse liquid zinc is steady or not is one of the most important factors that affect the life of distillation column and the output and quality of product.Nowadays, the automatic measure online to such a parameter hasn't been realized for the corrosive, high-temperature and little-flux liquid in the world. In this paper, a new soft sensor method—weighing method on the basis of understanding deeply rectifying craftwork is proposed, which resolves the problem that the flow of high temperature coarse liquid zinc has never been measured. This method looks upon weight as parameter to be measured and gets result from mathematics model between flow and weight based on orifice flow of hydrodynamics.The paper presents the structure of the two-level computer control system and the control process : the host computer outputs the flux enactment according to the production and scheduling, then the lower computer (PLC) controls the step motor which adjusts the opening degree of the value and realizes the steady control of the liquid zinc flux with PID controllers according to the flux enactment .At the same time, the paper designs a set of software to realize the supervisory of the fields and the management of the workers.The system has been applied in the factory. The running result indicates that the system works reliably. The method resolves the difficult control problem about the flux of corrosive, high-temperature and little-flux liquid and brings much economic benefits for the factory. |
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