Design Of The Heat Exchange Station Monitoring System For Pingshuo Living Area

With the continuous expansion of the urban scale, people’s sense of environmental protection constantly enhances, so it is necessary to replace the original scattered boiler heating into the central heating. The problem is that the number of heat exchange stations increases and heating pipe network scale is more complexity. It is the primary problem how to make the heat exchange station operate energy efficient under the condition of best meeting heat load. Meanwhile, it is also the primary problem in heat exchange station control system how to deploy uniformly the heat in monitoring center and how to realize effective centralized control and management.There are some problems in heat exchange station running process of Pingshuo living area, and these issues are as follows.Thermostatic heating losses large heat in in the secondary network, and heating energy is greater than the requirements of heat load; Higher operating costs caused by large power used by equipment and energy wasted badly in heat exchange station; Central heating can not achieve centralized deployment of heat, because of instability in data transmission and communication and poor system linkage. In this paper, there are two parts. First,from rational allocation of energy and energy saving, how to adjust the temperature and pressure of heating pope network is detailed analyzed. Second, according to the process of heat exchange station and control requirements, heat exchange station monitoring system hardware is selected, and the control loop is designed, next network and software programming is established. In the second part, it contains instrument selection, analog data acquisition, design of supply of the main circuit power supply, the design of supply pump’s control loop, the programming of PLC and monitor and design of system’s network architecture. Monitoring system designed by this paper includes three parts, which are device-level, functional level and monitoring level. The design of control system’s network is based on PROFIBUS-DP fieldbus, MPI fieldbus and GPRS wireless network. Using PROFIBUS-DP fieldbus to construct master-slave control system, the system completes communication and chain control between devices. MPI fieldbus and GPRS wireless network make functional level, touch screen and WinCC monitoring System in monitor connected, then related hardware configuration and software programming are given.The monitoring system is mainly implemented some features listed as follows. First, the system can real-time monitor the heat exchange station equipment and related pope network operating data, and it matches reasonably operating conditions. Second, in the heat exchange station, electric control valve opening in primary side and the flow and temperature in secondary network are evenly regulated, which eliminates uneven temperature between remote users proximal users and guarantees the heat demand according to heat load. Third, computer monitoring system in operations center can record and inquire the dates and operational failures generated during system operation, which improved the system’s ability of document management and quantitative management. The monitoring system designed by this paper is applied into the heat exchange station of a city. The results show that the running efficiency is improved obviously, power is saved and pollution is reduced. Meanwhile, it provides an intuitive user-friendly interface to the operators. So the operators can monitor site equipment operating conditions and parameters in real time through the monitor screen, and the operators can centralized deployment of heat by controlling the field devices.