Design And Implementation Of Thermoelectric Chemical Water Making Automatic System

This paper mainly to the system upgrading thermoelectric chemical water making automatic system in Power Plant of Xingtai Iron and Steel CORP.,LTD in HeBei province as the research object, and discusses the application of programmable control) technology, PID control technology and human-machine interface technology in the field of water treatment.The main research work in this paper includes:(1) It describes the process characteristics and control requirements, of thermoelectric Chemical water making automatic system, and discuss the design of thermoelectric Chemical water making automatic system, including hardware selection, network configuration and control system configuration, software design etc..(2)According to the existing characteristics of the chemical water treatment equipment, this paper selects S7-300 series PLC of SIEMENS company as a controller in hardware selection and further introduces the programming environment and programming features of S7- 300 PLC. We use Advantech IPC Taiwan as equipment and use WINCC of SIEMENS as software development of human-machine interface, and uses the distributed field bus PROFIBUS-DP network to realize the CPU master station and the I / O from the information transmission between stations. Control mode of the system includes centralized monitoring control and the operation on the spot, the operation person can use the monitoring pictures on CRT for monitoring and control of the whole production system operation. In addition, it builds local operation box which includes remote control/manual switch nearby the process equipment. It use to put into operation before the failure occurs in the process of debugging or running after repair.(3)At the same time, based on the thermoelectric chemical water system in addition to the brine constant pressure for problems in-depth explanation; And at the same time the constant control of the liquid level put forward its own practices, and the practice is a good try, meet the requirements of the user. At the same time, in order to guarantee the stability of the power supply system of PLC for control system of power supply system reform also is introduced.(4)Thermoelectric Chemical water making automatic system of field operation results show that the system can meet the requirements of automation, feed water treatment of boiler in thermal power plant control requirements, and has the advantages of high reliability, stable, running, flexible control, meet the requirements of customers design.