| Energy shortages have been an important issue in China’s economic development,and inequalities in energy distribution also exist.Central heating has developed rapidly in China recently,but due to the increasing heating radius of heating area,the phenomenon of pipe network imbalance is becoming more and more serious.In addition,coupled with unreasonable operation of heat source and heat exchange,the energy consumption problem is particularly serious and prominent.Hence,energy-saving operation has become the primary work of central heating station.In this study,we chose central heating area as research object,mainly studied the existing problems of severe imbalanced network,inefficient heating system operation and insufficient energy-saving effect.Firstly,via analyzing the causes of hydraulic imbalance in the operating system,the imbalanced network was improved by installing the self-balancing valve.Secondly,together with the internet of things(IoT)technology,a dynamic central heating network system was built.The real-time operation data of the Heat Transfer Station(HTS)is collected and uploaded to the control center.Via monitoring and analyzing the indoor and outdoor temperature changes,the control center could timely feedback this information to the HTS and thus achieved the dynamic adjustment.Thirdly,A centralized energy-saving operation system was established via analyzing the big data of the heat exchange station,combining meteorological data and the influence of building type on heating,setting a reasonable operation curve and adjustment range.Finally,the operation mode of packet segmentation was used after the system was put into operation.Through the above-mentioned energy-saving reformation,the hydraulic imbalance of pipe network is significantly improved.The indoor temperature difference between the near end and the remote users was reduced,which could keep the indoor temperature at about21℃.This reformation not only met the requirement of basic indoor temperature,but also maximized the energy saving.Compared the coal consumed before and after this reformation,the average coal consumption per unit area was reduced from about1.31kg tce/m~2 to 0.66kg tce/m~2.It achieved to save 2.31 million yuan on coal consumption and the annual energy saving rate up to 4%.To sum up,the energy-saving reformation of heating system solved the problem of serious hydraulic imbalance in pipe network.The efficiency and energy saving were improved significantly via the intelligent operation of HST.This reformation had positive economic and environmental benefits and it was worth to promote.It also could provide reference for energy-saving reformation of central heating system to neighbor.HTSs in surrounding areas. |
