| With the development of non-ferrous metallurgical industry, the present situation of China's metallurgical acid production have made a remarkable progress. And the production of sulfuric acid preparation from flue gas are more and more big in the total production of sulphuric acid. Sulphuric acid crossflow system as a vital crucial procedure, not only absorb the vast majority of sulphur dioxide which can solve environmental problems, but produce product acid which can create enormous economic returns, and the operational readiness directly influence the operating condition of the whole acid making system. However, Sulphuric acid crossflow system is a big inertia, big time-dealy and time-varying nonlinear system, which have more disturbance factor. Therefore, it is difficult to establish a math model to reflect working situation of sulphuric acid crossflow system accurately and gain ideal control effect.The research purpose of the paper is to adopt advanced intelligent control strategy to adjust important variable of sulphuric acid crossflow system, and Siemens PLC and WinCC configuration software are used to design an automatic acid crossflow control system of sulphuric, so as to achieve efficient production of energy-saving and emission reduction.The treatment of acid-making system which use smelting gas and the composition of acid crossflow system is analyzed, and an automatic control system to realize the real-time detection, adjustment of procedure variables and process monitoring is designed.The system control scheme is designed after analysis and discussion of sulphuric acid crossflow system. Due to fuzzy control do not need accurate mathematical model and robustness is strong, disturbance and parametric variation to control effect were greatly abated. In the meanwhile, fuzzy control were adopted in the consistency control to adjust 93% valve and 98% valve, and Partical Swarm Optimization is used to optimize membership function. Simulation results from laboratory show that the fuzzy control strategy is effective. Because of acid crossflow process can bring about level change in the two recirculating tank, we adopted threshold treatment in this field.Based on the system control scheme, hardware and software of control system are designed in the paper, S7-400H PLC controller for programming and configuring is adopted, and the industrial Ethernet and FidldBus technologies is adopted to provide the communication and connection between the locale and controlling room. In the meanwhile, procedures of automation process and fuzzy control is designed, and the monitor screen is also designed by using WinCC software. The control requirements of the system are fuifilled. |
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