Water and electricity are important means of production that are indispensable for human life, and water and energy saving have become the characteristics of the times. Our country with a shortage of hydropower and energy is facing the wanton discharge of urban sewage and the decline in water quality. How to make the water quality reach daily life, the reliability and stability of industrial production, directly affect the normal work of residents and economic development.
With the rapid development of industrial production, equipment has increasingly higher water quality requirements. Traditional methods generally have the disadvantages of different degrees of waste of water, power resources, low efficiency, poor reliability, and low degree of automation, which seriously affect the industrial system of water. The current water supply mode should be high-efficiency, energy-saving, automatic and reliable, based on the integration of PLC control technology and electrical automation technology. By using this system, the stability and reliability of the water supply system can be improved. At the same time, the system has good energy saving, which is especially important in today's increasingly scarce energy. Therefore, the design of the system improves the efficiency of the enterprise and the people. Living standards, reducing energy consumption and other aspects have important practical significance.
The water preparation system of a water plant in Jiangxi consists of two parts: reverse osmosis pure water system and injection water preparation system. The main control objects of the reverse osmosis pure water system are raw water valve, raw water pump, water temperature control valve after sand filtration, water inlet valve, high pressure pump, flushing valve, pure water pump, metering pump, etc.
The main control objects of the injection water preparation system are the raw water inlet valve, the injection water outlet valve, the pure steam outlet valve, the injection water pump, the raw water pump, the cooling water pump, the condensate recovery pump, the steam regulating valve and the cooling water regulating valve.
In order to adapt to the development trend of the water treatment industry and meet the needs of the water treatment industry for automatic control systems, the main directions for the future development of the automatic control system of the water treatment industry include the following aspects:
Redundant control system structure
PLC reasonable communication port setting
Configuration software rich driver
Professional program module
Data analysis, technical support
Remote monitoringAccording to the system requirements, the local control adopts Siemens S7-200 series CPU, expands Aoyuexin EM277 intelligent DP slave module and other Aoyuexin 200 series IO modules, and transmits field data to Siemens in the remote control room through Profibus-DP field bus. S7 313C-2DP master station CPU. This configuration has low cost, convenient wiring, strong scalability, and the slave station can operate independently of the master station. The upper computer monitor adopts Kingview 6.55, communicates with Siemens S7 313C-2DP through MPI protocol, real-time monitors the status of each part of the system and conducts data analysis.
System process flow chart:
Water treatment system controlled by PLC electrical automation. The system uses PLC to realize the start and stop of multiple pump motors, and at the same time incorporates the control of the pump motors into the automatic control system. The pressure sensor transmits the electric signal to the control module to control the start and stop of the high-pressure pump according to the pressure, which ensures the safe operation of the high-pressure pump. Use conductivity meter and resistivity meter to monitor the quality of water produced in real time. The system not only effectively guarantees the quality of water produced by the water treatment system, but also has the advantages of reliable work, simple construction, significant energy saving effect, fully automatic control, and no secondary pollution. .
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