Overview of Chemical Water Treatment Systems

Thermal power plant water vapor circulation system as a thermal system working medium and cooling medium water has strict water quality requirements, such as high pressure boiler feed water not only requires low hardness, dissolved oxygen volume is minimal, solid content and organic content is also minimal, the water Must be precipitated, filtered, desalted, degassing and other high-purity water treatment equipment to seawater for the supply of water needs to be desalination equipment after treatment into the power plant water cycle system, did not meet the water supply standard water will make the power plant equipment can not be safe Economic operation. Therefore, the power plant chemical water treatment system as an important auxiliary workshop and auxiliary system of power plant, especially large-scale thermal power plant and heating power plant chemical water treatment workshop processing capacity, complex process, high water quality requirements, its operation is directly related to the power plant Safe operation and reliability.

 

Chemical water treatment system

The traditional chemical water treatment system uses analog screen monitoring, monitoring points scattered a variety of data collection and management is not concentrated, the level of automation is not high efficiency is low. My company's chemical water treatment system consists of two upper computer and a set of redundant PLC system, through the Ethernet network will be on the computer system and on-site monitoring and control points closely integrated as a whole, constitute a complete system, a chemical Water treatment unified centralized control.

 

The host computer system adopts Advantech's industrial computer to form a powerful remote monitoring and control system. The PLC control system adopts the dual-system hot standby redundancy mode, and the remote I / O way to connect the site needs to monitor and control the point. Control station can ensure that the system downtime maintenance time is zero, to minimize the intervention of the system, the host computer and PLC control station between the use of high-performance industrial Ethernet communication, information transmission is reliable, safe and stable. Through the system design and system configuration, the dynamic monitoring and control of the whole chemical water treatment process and the running state of the equipment are realized, and the functions of the curve display, historical data preservation, rights management, operation query, alarm and printing are realized.

 

The local instrument system consists of pressure and temperature transmitter, flow meter, level gauge, PH value table, acidity meter, alkalinity meter, silicate detector, conductivity tester, pressure and pressure switch, etc. Water tank level, pipe pressure, inlet and outlet water flow, water temperature, water quality testing, and through the detection value, the process of automatic control and regulation.

 

Field control equipment from the pump, fan, pneumatic valves, electric doors, control valves and other components, including water pumps, fans controlled by the motor, pneumatic doors controlled by the solenoid valve.

 

Chemical water treatment system function

The function of the host computer is: to provide a variety of parameters to monitor the screen, the digital display of chemical water treatment system in the tank level, pipe pressure, real-time value of water flow and accumulated value, water temperature, water quality testing, record the historical changes in these parameters , When the parameter value exceeds the preset value issued a voice alarm, recorded to the alarm history in order to query. The operation of the equipment, failure and other status display, the start of the device, stop the operation, and operation records, in order to query. A sound alarm is generated when each device is faulty and a fault condition (fault time, fault type, etc.) is recorded to facilitate accident analysis. Important parameters, alarm, fault can report print.

 

The main computer function includes the signal acquisition processing, the accumulation of traffic, the accumulation of running time, spread to the host computer display, accept the operation of the host computer to determine the automatic control conditions on the pump fan, pneumatic valve logic control to complete the process.

 

Water treatment program control system with the operation mode selection, equipment failure automatic alarm, on-site information collection, processing, operation display and other functions. In the control room, the operator can centrally monitor, manage and automatically control the entire process system through the control system. The operator can also operate the pneumatic valves, electric doors, pumps and fans remotely at the operator station. The system retains the local control function, provides local manual operation, even in the case of complete failure of the program control system can also be achieved through the local control of manual water treatment to ensure reliable use of the boiler unit.

 

System internal PLC through the internal procedures to set the alarm and interlock protection, in the event of failure, immediately stop the corresponding operation, and send the appropriate alarm signal, automatically start the backup device. And the valve open / overtime fault alarm, the valve position signal failure alarm, the pump / fan start / stop overtime fault alarm, water pump / fan protection device accident trip / power alarm system can also be through the switch and the whole plant auxiliary Control network system associated with remote operation parameters to monitor and manage.