Study On Application Of Intelligent Adjustment Of Hydraulic Balance In Heating Secondary Pipe Network

In recent years,China’s urbanization process has been rapidly advancing,leading to the continuous expansion of urban areas and an increasing concentration of heat supply.People are paying more and more attention to indoor heating temperatures during the winter season.In the secondary pipe network system of heating,especially in some old residential areas,the lack of hydraulic balance control mechanisms results in a low level of automatic hydraulic balance adjustment,causing serious hydraulic imbalance phenomena.This makes the distribution of hot water flow in the secondary pipe network uneven,resulting in severe waste of heat energy,and the indoor temperature of the endusers cannot reach the design requirements.This article uses Io T control technology to build a remote control platform through NB-Io T communication,monitoring the flow,temperature,and supply-return water pressure difference in the secondary pipe network system,and analyzing and adjusting the hydraulic balance of the secondary pipe network.This adjustment method is fast,efficient,and accurate,not only improving the quality of the heating supply but also saving energy consumption,thereby bringing good economic benefits.Firstly,this article compares and analyzes the hydraulic balance design schemes of the secondary pipe network and summarizes the reasons for the easy hydraulic imbalance in traditional secondary pipe networks.Based on this,a clustered design scheme for the secondary pipe network is proposed.By studying the water pressure distribution diagram of the secondary pipe network,it is demonstrated that the clustered design of the secondary pipe network can shorten the distance length of the most unfavorable loop circulation water,reduce the operation resistance of the main pipe,and improve the hydraulic stability of the pipe network.Secondly,based on the advanced technology of the Io T,this article uses Io T technology to build a hydraulic balance adjustment system for the secondary pipe network,establishing a data communication mechanism between the station,network,and users in the secondary network system,realizing the intelligent regulation of the secondary pipe network operation.The Io T data terminal transmits the detected temperature,pressure,flow rate,and other parameters wirelessly to the PCL data control center in the heat exchange station.Through thermal coupling analysis and calculation,the control instructions are transmitted back to the intelligent Io T data terminal,driving the intelligent balancing valve on the return water pipeline to adjust the hydraulic balance.Thirdly,this article compares several commonly used methods of hydraulic balance adjustment in secondary pipe networks,clarifies the adjustment method adopted in this study,collects the return water temperature data,and uploads it to the server.The server combines other parameters to automatically calculate the return water temperature setting of each unit and issue it to the receiver.The receiver automatically adjusts the valve opening according to the set temperature to maintain the set temperature.Finally,this study conducted on-site investigations in a small residential area in Weifang City,summarizing some problems in the secondary pipe network system,and providing renovation suggestions.After redesigning and implementing a smart secondary pipe network control system for this residential area,the system collected the opening sizes of all valves and return water temperatures during operation,then calculated the target return water temperature,set the adjustment interval and range,and achieved a consistent temperature for each unit within 5 hours,resulting in a decrease in the secondary pipe network flow rate and a drop in the frequency of the heat exchange station’s circulation water pump from 48 Hz to 45 Hz.After the renovation,the end-users of the pipe network were visited,and the indoor temperature of each unit reached above 18℃.Based on the above research,it can be concluded that the heating system in old residential areas is not intelligent enough,unable to accurately grasp the status of each device and changes in indoor temperature.Therefore,it is necessary to continuously increase the energy supply to maintain the temperature,resulting in serious energy waste.After the renovation,the system adopts advanced intelligent control technology,which can accurately grasp the opening of each valve and temperature status,achieving minimum energy.