Application Research Of Terminal Dynamic Load Forecasting And Energy Saving Control Strategy About Central Heating System

With the rapid development of the domestic economy,people is increasingly demanding the comfort of the living environment.The central heating is an important basic livelihood cause in China,and an important means to ensure the comfort of winter living environment in northern China.At present,because of grim situation of China's energy and environmental protection,the use of advanced technology and control strategies to ensure the efficient and energy-saving operation is the trend of Central heating systems.With the development of frequency control technology,heating metering and network monitoring technology,network control technology,relying on these advanced technologies to research energy-saving control strategies for central heating systems and improving the energy efficiency of central heating systems have become important content of research and attention in the heating field.Based on the date of the thermal network monitoring and heating management platform technology of a thermal power company in Shijiazhuang,hebei Province,this paper takes the central heating secondary network system as the research object,and studies the energy-saving control strategy of the heat exchange station and the terminal equipment:This paper analyzes the overall structure and operation regulation process of the central heating system,and finds that there are limitations in the current variable flow control strategy of the central heating station system and the calculation of the secondary water supply temperature by the climate compensator.In view of the deficiency of the current control strategy which is based on the centralized effect of the system to control the average heating effect of the whole system,considering the actual heat demand of the end-users,the mobile polynomial least squares method with the characteristics of dynamic adjustment is adopted.The end load of the central heating system is predicted dynamically,and then basing this load,this paper puts forward that energy-saving operation strategy of the terminal equipment,and the regulation and control strategy of the water pump of the heat exchange station,which satisfies the heating on demand as much as possible and reduces the energy consumption of the secondary side of the heating system.This paper for the hydraulic imbalance of the heating system,analyzes the working principle of the current throttle balancing valve and the applicability of the static balancing valve and the self-operating flow balancing valve under the variable flow system,and putsforward the idea of active regulating flow for the terminal equipment.The method can truly realize the whole network frequency conversion adjustment,not only energy saving,but also effectively solve the problem of hydraulic imbalance in the central heating system;this paper compares the advantages and disadvantages of the active regulation mode and the throttle regulation mode,and the whole network frequency conversion adjustment mode can not only Improve the traditional valve throttling adjustment method to disturb the change of the system along the path resistance,and the system economic index has not increased significantly.It is a worthwhile operation mode of the central heating system.This study also designed the end active variable frequency regulation system.Structure and corresponding system.Aiming at the problem of hydraulic imbalance in heating system,this paper analyzes the working principle of current throttle balance valve and the applicability of static balance valve and self-operated flow balance valve under variable flow rate system,and puts forward the idea of active regulating flow rate at the end of the system.This way can truly realize the whole network frequency conversion regulation,not only energy-saving,but also can effectively solve the problem of hydraulic imbalance in the central heating system;The paper compares the advantages and disadvantages of active control mode and throttle regulation mode.The whole network variable frequency regulation mode can not only improve the disturbance of the traditional valve throttle regulation mode to the change of system resistance along the road,but also the economic index of the system has not obviously increased.It's a central heating system value.The paper also designs the structure and the corresponding system of the terminal active variable frequency control system.On the basis of terminal dynamic load forecasting,aiming at the limitation of climate compensator in heat exchanger station at present,this paper puts forward to energy saving control strategy of heat exchange station and terminal equipment in central heating system by the variable flow.In this paper,when the variable flow regulation in heat exchange station,the mobile polynomial least squares method is used to dynamically forecast the load of the system,and the calculation of the secondary water supply temperature is modified and improved.Considering the thermal hysteresis of the heating system in engineering application,and combined with the dynamic load prediction at the end of the system and the actual measured heating parameters,the control strategy of the water supply temperature and flow rate in the secondary network of the heat exchange station is put forward.On the basis of the actual operation data of a thermal power company in Shijiazhuang area of Hebei Province,this paper modify the water supply flow of the secondary network dynamically,verifies and analysis the effects of the proposed controls strategy.The results show that the centralizedsupply system control strategy with terminal dynamic load forecasting can save the output energy consumption by about 24.4% compared with the traditional control strategy.It can meet the comfort requirements of thermal users,reduce the energy consumption of central heating system and improve the operating efficiency of the system.