To ensure the quality of heating, there must be two important prerequisites. The first is to ensure that there is corresponding pressure in the system. The second is to ensure the proper temperature and flow of the aqueous medium in the system. Only by ensuring these two important prerequisites can we have the conditions for ensuring the quality of heating. This requires monitoring and management of the heating network.
The monitoring system consists of: The whole system is divided into a central station and N substations. The central station is located in the heating dispatch center. The data transmission station of the central station is connected to the host computer through the RS-232 serial port; The main heating pipe heat exchange station, substation digital radio (module) is directly connected to the RTU terminal, can collect temperature, pressure, flow and other data and control the heating pipe network measurement point and the heating source control terminal operation.
The specific system block diagram is as follows:
The data transmission station of the central station is connected to the host computer by an RS232 serial port, and the substations are monitored and managed in real time.
The block diagram is as follows:
Each substation is connected to the RTU using a digital radio station in the heat exchange station to collect real-time data such as temperature, pressure, and flow, and to effectively control each collection point according to the central station instruction. The block diagram is as follows:
Solution Analysis:
The system consists of a central station and a secondary station. The master station is responsible for monitoring and management. The slave station uses RTU modules to implement data acquisition, storage, control, and upload.
The slave station uses the RTU module to collect and process signals such as temperature, pressure, flow rate, current, temperature, and start/stop status of the heat exchange station. The data is transmitted to the central station via the data transmission radio station and receives commands from the central station at the same time. The heat exchanger pump, control valve, etc. are controlled. The system can perform real-time automatic monitoring of the heat exchange station. The operator can see the data of each heat exchange station at the main station and control the heat exchange station to realize the unattended operation of the heat exchange station.
The main station uses a PC computer. The computer's RS-232 serial port is connected to the data transmission station. The master station sends data to the slave station and receives data from the slave station. The master station receives the respective signals from the station and displays the output after processing. If an abnormal situation occurs, an audible alarm may be issued to remind the operator to take measures to prevent accidents. The system has an online configuration function. According to the status of the entire thermal system, it automatically configures each slave online and controls the automatic operation of the entire system. The host can automatically generate a variety of reports, and is equipped with on-duty inspection functions and timing printing, random printing capabilities, to achieve the automation of the entire thermal system.
System advantages:
1. The thermal network monitoring system solves the problem of misalignment of the thermal network, realizes the balanced operation of the thermal network, and greatly improves the heating effect.
2. It plays a role of saving energy and reducing consumption. The thermal station automatically adjusts the temperature of the water supply according to the change of outdoor temperature, thereby maximally saving energy consumption and improving the service quality of heating.
3. The data of the thermal network monitoring center is basically in sync with the on-site data. This is how far the human and material resources invested in the operation of the thermal network are impossible to achieve.
4, to avoid the phenomenon of stealing steam, steam leakage, due to 24-hour online operation, to eliminate the user's idea of ​​stealing, on-site measurement failure can be found in the shortest possible time, and the failure time record for the record. Avoid the loss of measurement.
5, through the simulation system for the thermal network of water, thermal calculations, thermal network control operation analysis, so that the heat network to achieve optimal operation. The use of fault diagnosis, energy loss analysis to understand the pipe network insulation, resistance loss, the efficiency of the use of equipment, so that the thermal network of pipe losses to a minimum, in order to achieve the most economical operation. Through the comparison of historical data and real-time data, it is analyzed whether there is leakage in the pipeline network and whether the equipment needs maintenance to achieve the safest operation.
Conclusion: Centralized heating is a nationally promoted energy-saving and environmental protection measure. A heat exchange station is an extremely important link between a heating station and a user. Its work safety and reliability directly affect the quality of heat supply. As a traditional data transmission device in the field of industrial control, the digital radio station has solved the disadvantages of the user's heat transfer station's decentralized management, and when it uses a digital radio station for one-to-many networking, it not only solves the disadvantages of decentralized stations, but also reduces Its unit cost is a real-time, reliable and economical choice.
Gudi Digital Radio's Urban Heating Pipe Network Monitoring Solution
The urban heating system is a large, closed, complex circulatory system consisting of heat sources, heating networks, and heating users (indoor heating systems). With the rapid development of urban heating pipe network construction, from a single heat source to multiple heat sources, the scale and quantity of pipe network are continuously expanding, and the number of heat users is increasing rapidly. How to effectively manage the facilities and equipment of the urban heating system, improve the efficiency of the heating network, save energy, and meet the needs of users have become an urgent problem to be solved before the urban heating department.