PLC application in water purification equipment

Industry in developing countries played an indelible role in the development of economy, especially in China today, the development of industry led to the rapid development of related industries, to become one of the important pillar of national economy. But with rapid development of industrial countries understand that the development of industry also means the destruction of the natural environment, especially in severe water pollution, so the protection of water sources, sewage management, water purification is very important. With the continuous improvement of people's lives, especially in hospital, chemical laboratory and other units, also put forward higher requirements on water quality, so according to the needs of the present situation, for a better water purification equipment also puts forward the corresponding requirements. Which promoted the rapid growth of the purification equipment company, is also more stable to control part requirement, more reliable! Like some increased investment in capital and technology of water purification equipment manufacturers, with PLC instead of the previous single chip microcomputer control system. Background: equipment control system: power supply module + is given priority to with 8051 single chip microcomputer, and extended A/D and I/O chip to build PCB panel; System analysis: system by single chip microcomputer to realize the automatic control system, due to the overall design of the circuit can not very reasonable, protection measures such as peak is bad, very capacity circuit malfunction. This has increased the service, also increased the cost of the product, the invisible influence the development of the company's market, so users will want to use more reliable system instead of the original system, to reduce services, reduce the comprehensive cost. Principle: chemical reaction in a special box, through the PLC controller control two heating signals and timely collection of PT100 temperature signal, make the temperature of the reaction tank always stay in setting, again through the PLC pulse to control metering pump to join ClO2 dosage, make the appropriate concentration of ClO2 react with water, and achieve the purpose of disinfection. Control requirements: 1. Reaction temperature control: the system shall be carried out under the specified temperature, so you need to keep the reaction tank water temperature constant. Concrete method is to set a temperature D414, setting back to bad D410, set D535 overtemperature. When collecting temperature less than D414 D310, began to heat, when the temperature reaches D414 + D410 stop heating, the temperature drops to D414 reheating, the make temperature within the set back to the poor, to achieve the purpose of constant temperature. If the temperature more than set D535 has to stop heating and overtemperature alarm. 2. ClO2 dosing quantity control: control system must be strictly controlled to join the ClO2 concentration inside the reactor, can make the water disinfection, and not too much to form secondary pollution, so the control of chlorine gas high accuracy requirement. Specific methods are ClO2 dosing quantity according to stay disinfectant fluid flow and unit dosing quantity calculation, and then, the sensor will feedback to the controller of residual chlorine in water quantity ( PLC controller) With the set value, the residual chlorine ( The target) Compare and dosing quantity according to the difference of both units of correcting speed and amplitude, calculate the new unit dosing quantity, thus to control the dosing quantity, within the scope of the reasonable water flow by ClO2 unit dosing quantity, metering pump frequency residual chlorine is higher than set value of the output ( The target value) After, reducing unit dosing quantity, reduction is controlled by the size difference. Residual chlorine is lower than the set value ( The target value) After dosing quantity increase unit, of the controlled by difference size. Traffic signal is detected, the after time delay involved in the operation, the delay time length can be set in 0 ~ 150 minutes, after operation under control the frequency of the pump ( Control the amount of adding the ClO2) Output control of metering pump frequency calculation formula: 3. Alarm control: overpressure pressure water under voltage, negative pressure system, the lack of raw material - - - - - - - - Stop alarm, metering pump, high temperature water and overtemperature - - - - - Alarm and stop the heater selection: 1. Controller: the in DVP14SS11T2 + DVP04PT - S+ DVP06XA- S。 The host DVP14SS11T2 responsible for reaction tank two heating signals; And control of metering pump frequency control to join reaction tank ClO2 dosage. DVP04PT - S acquisition reaction tank 2 temperature signals; 2. Display section: the stage of DOPA - A57GSTD and TP04 terminal display. Depending on the end user to choose different display. 3. Milton Roy (m 弥尔顿罗伊) LMI electromagnetic drive diaphragm metering pump: ( Model P766 - Y/traffic 0. 8 to 7. 6 l/H / 3 pressure. 5bar） Supply ClO2 reactor, the metering pump is controlled by the PLC pulse, PLC each send a pulse, metering pump action time, output a stroke ClO2, maximum 100 times/min; Metering pump stroke can be manually adjusted, metering pump every action to the output of liquid, can be set 0 ~ 100% range. 4. Sodium chlorate and hydrochloric acid using electromagnetic valve switch to supply. 5. Reaction tank temperature acquisition with a standard Pt100, da DVP04PT - with Taiwan S direct acquisition and conversion, is very convenient.
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