At present, most of the sewage treatment control systems in my country have low automation, low safety, improper management, and generally lower efficiency than the world standard. The aeration process control, data communication and monitoring management in the sewage treatment system are the main problems that need to be solved urgently. China's sewage treatment automatic control system is relatively backward, the cost of sewage treatment remains high, and the quality of the treated sewage discharged from the sewage treatment plant is unstable. Therefore, how to establish an effective automatic control system to optimize the operation effect and reduce the operation cost is of great significance.
1. PLC system:PLC is the abbreviation of Programmable Logic Controller. It is used as the controller of the processing system to achieve the functional requirements of the control system. You can also use a computer as its upper computer to connect to the PLC through the network to monitor the production process in real time. Its characteristics are as follows : Convenient programming, short development cycle and easy maintenance. Strong versatility and easy to use. Strong control function. Modular structure, strong expansion ability. Therefore, it is widely used in sewage treatment.
The control objects of a sewage treatment project in Liuzhou, Guangxi include water inlet wells, coarse grid rooms, lifting pump rooms, fine grid rooms, aeration grit chambers, blower rooms, biochemical reaction tanks, secondary sedimentation tanks, ultraviolet disinfection cabinets, outlet channels, etc. , Each key control area needs to detect parameters such as liquid level, temperature, PH value and so on.
The overall block diagram of the electrical control system of the industrial sewage treatment system is shown in the figure above. The PLC is the core controller. It completes the operation, stop and operation of related equipment by detecting the input of the buttons on the operation panel, the input of various sensors, and the input of related analog quantities. Speed ​​control.
Combining control requirements and technology, this control system is a combination of on-site control and remote control. On site, Siemens S7-300 host + IM177A + OYES 200 series modules are used to collect data and control motors such as water pumps and gates, and then use the DP bus. It communicates with the engineer station located in the central control room of the office building. The central control room is equipped with an industrial computer, which monitors and remotely controls the parameters of each control area based on the upper computer software developed by KingView.
The process flow chart is as follows:
1. It adopts IM177 DP IO expansion module, which can expand 32 sub-stations and has strong expandability.
2. OYES 200 series PLC products have strong anti-interference, and the whole system is stable and reliable.
3. The OYES 200 series has a rich variety of products, which is convenient for customers to configure and select.
4. The self-diagnostic function of system failure can eliminate problems in operation in time and ensure the reliability of system operation.
5. Siemens 300 main engine + OYES 200 series products are stable, reliable, and cost-effective.
4. Concluding remarks:Considering many factors such as environmental protection and water injection, it is very necessary for industrial wastewater treatment. Therefore, the effective combination of the current state of the art process, the use of automatic metering and detection instruments, and the PLC control system technology will provide an effective automatic control method for the current industrial sewage treatment control system.
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