STEC2000 embedded controller for the urban heat network centralized monitoring system

I. Project Background The central heating business has entered a stage of rapid development since entering the year 2000. The annual heating area has increased by as much as 20%. At the end of 2001, the national central heating area has reached 1.46 billion square meters. The district's central heating area accounts for about 40% of the total housing area, and there is still much room for development. At present, there are about 1,000 thermal companies in China, and the average heating area is about 1.5 million square meters. The centralized monitoring system of the heat network has become an indispensable component. The heating network monitoring system has a very significant economic benefit for the heating company to improve the heating efficiency and reduce the operating cost. At the same time, it can reduce the long-term duty personnel of each thermal station and greatly reduce the management cost.
II. Project Example Jinan Nanjiao Thermal Power Plant has a central heating area of â€‹â€‹5 million square meters. There are two thermal power plants and one hot water boiler room, and about 80 heat exchange stations. The STEC2000 embedded controller was used to complete the monitoring system of all 20 steam heat exchange stations in 2002. The system structure is as follows:

Heat network monitoring system structure
The monitoring center uses two communication servers, one is responsible for data collection, control command transmission, one is responsible for specifically receiving alarm information of each thermal station; one database server adopts Oracle8i database; one network publishing server runs network monitoring software HOMS2 .0.
The communication network uses ordinary telephone dialing, but the monitoring center and each thermal station telephone are unified to construct an internal virtual network, and only need to dial the internal 5-digit number, which greatly reduces the communication cost.
Each thermal station uses a single STEC2000 embedded controller to perform all monitoring functions of the thermal station:
1. Real-time data acquisition: measuring steam temperature, pressure, water supply temperature, pressure, operating state of circulating pump and make-up water pump, main process parameters such as liquid level of water supply tank;
2, data storage: the controller is equipped with 16M data space, according to the needs of each thermal station, set the data storage interval, the shortest 1 second, up to 1 hour, all the collected data is stored in the field controller In the middle, all data storage for a heating season can be completed.
3. On-site control: The controller can flexibly complete the automatic control of outdoor temperature compensation, automatic water supply, temperature adjustment, duty heating, flow adjustment and so on.
The secondary network temperature control has multiple control modes such as direct setting control and outdoor temperature compensation control. The direct setting control refers to the operation of the on-site control equipment operating street personnel to directly set the appropriate secondary network water supply temperature according to experience. Then, the control device ensures that the secondary network water supply temperature reaches the set value by adjusting the primary network electric valve; the outdoor temperature compensation control adjusts the secondary network water supply temperature at any time according to the change of the outdoor temperature, either by checking the table or by The way to set the curve is realized; on the duty heating, the water supply temperature of each heat station is set according to the experience of the operating personnel.
Automatic water supply control: Automatic water supply can be divided into three types: pressure switch automatic water supply, variable frequency constant pressure water supply, start and stop automatic pressure and water supply.
4. Safety protection: Control the main process parameters through real-time monitoring. When the parameters are out of range, collect emergency measures, cut off the power supply of the regulating valve, stop the steam supply, and prevent the occurrence of safety accidents caused by vaporization.
5. Alarm: There are various alarm information such as power failure alarm, water tank water level alarm, over temperature alarm, over pressure alarm, etc. When the alarm signal appears, the controller immediately dials the control center alarm special telephone to request processing.
6. On-site display operation: Real-time monitoring of the operation process of the heat station is carried out by using a 5-inch color liquid crystal display operation screen, and the optimal operation plan is set through the keyboard, and the stored historical data and alarm records are browsed.

Field interface
Third, the system evaluation After the STEC2000 control system was put into operation, the short-term more than two months brought huge economic benefits to the owners. After the on-site actual assessment by the Commission of Science, Technology and Industry for National Defense in March 2003, the system energy saving ratio was as high as 20%. Running a heating season will recover the full investment.

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