Uranium Multi-tower Level Process Control System And Design

In the Hydrometallurgical process，the resin ion exchange method is used to extracturanium, they are completed in a series connection blocks of the adsorption tower. One of theimportant factors that affect the efficiency of uranium production. is the difference of the resinlevel height among each towers, Adjusting the resin level height of each tower to the same hasgreat significance for the full utilization of production equipment.This paper takes the automation control process of uranium hydrometallurgy as thebackground. It takes the resin level height in six towers as controlled object, uses theimplementation of control strategies to resin emissions. This paper combines with mathematicalmodeling techniques, communication and detection technology. Researches and designs themulti-objective automatic balance system in the hydrometallurgical process. This paper mainlyincludes the following aspects:Firstly, Modeling and solving. Taking the resin level height in six towers as controlledobject, using material balance principle to establish the mathematical model, The objectivefunction of the model is that under the level height of six towers tend to balanced final, the resinemissions of each tower as large as possible. The constraints of model is the tank’s volumelimit. Then analyzing the model by the basic decision-making theories of Voting AnalyticHierarchy Process(VAHP). The resin emissions of the first tower should be solved at first, thenthe resin emissions of other tower’ can be calculated. Programming the mathematic model byMatlab, the analyzing results show that material level tend to balance quickly with the modelconstructed in this paper.Secondly, Design of the hardware. The IPC of Advantech’s is used as a host computer andSiemens S7-300PLC is selected as the core of the system, the PC and PLC can be connected byPROFIBUS-DP. Selecting the radar level to measure the level height of each tower, UsingRadio-Frequency Admittance Level Indicator to detect the resin level in tanks. choosing theelectromagnetic flow meter to collect the feed flow of each tower, Some related hardwarecircuit have been designed, Whites the uranium hydrometallurgy level control system programin PLC STEP7V5.4software, selecting PID regulator to control the valve of each tower.Programs which using VAHP to solved the model are designed，resin emissions are identifiedin each tower, and control programs such as resin feed, discharge, enhance are completed.Thirdly, Design of the monitoring interface. The KingView configuration software is usedto create monitoring interface for the level control system of uranium hydrometallurgy, theoperating state of these equipments can be dynamically showed in the main window. Somecontrol variables are displayed through the real-time and historical curve. Finally, the communication state between PC and PLC is debugged. Debugged PLCprogram and monitoring interface. Analysis of the data results demonstrates that the systemwhich designed in this paper is feasible.