Abstract
Nowadays the boilers are still an important component among various power equipments in industrial enterprises. Along with the fast development of modem industry，high efficient energy utilization is pursued more and more. And the boiler are a kind of Primary equipments for converting raw energy into secondary energy，so their control and supervision is very important for promoting energy utilization efficiency. But in our country，only some big and medium-sized boilers have adopted. Advanced control technique. Most boilers being used by medium and small enterprises，such as 10T/h and 20T/h boilers，are controlled by mete/relays，or even manually. That can not meet demand. In this paper，a control system scheme of PLC+IPC is Proposed，which is aiming at a 10T/h industrial boilers.
An advanced boiler control technique composed of PLC，inverter，and communication are detailly described with respect theory and application in this paper，which is based on two PLC control systems of 10T/h boilers in certain plant. The S7-300 series PLC of siemens company is adopted in the boiler control systems. The Step7 programming software is used to design the ladder chart，the STL language and the PLC correspondence network. Automatic control for the boilers has been realized，such as three impulse control for the water level，burning Process control，vapor pressure control. Moreover，an amicable man-machine interface，automatic storage of important boiler run data，and automatic print of reports in need is realized by using the configurations software WinCC of Siemens company. Each boiler in the system is controlled by one PLC respectively. PLC and IPC shaped into a MPI net. By using the MPI overall situation telecommunication technique and the WinCC software of Siemens company redundancy controls of the two IPC are designed for the safety. The automatic control of public facilities such as deoxidization equipment is also realized in the system.
