供热系统监控数据的分析

Analysis of Monitoring Data of Heating System

以某供热系统为例,根据2020年2月的监控数据,对热源、一级管网、热力站、二级管网、用户的运行情况、存在问题进行分析。对于热源、一级管网:热源供水温度随室外温度变化,一级管网质量流量基本保持稳定,说明一级管网采用质调节方式运行。对于热力站(均为混水连接热力站):各热力站的单位供热面积耗热功率参差不齐,在确保供热质量的前提下,不同热力站的单位供热面积耗热功率不同,应区别对待。各热力站的单位供热面积耗电量差别很大,主要与热力站混水连接形式有关。单位供热面积耗热功率基本随热力站供热面积的增大而降低。非节能办公建筑的单位供热面积耗热功率最低,酒店、医院略高,非节能老小区最高。对于二级管网:经水力平衡改造后的二级管网,各楼的日平均回水温度、日平均供回水平均温度均比较接近。与未进行水力平衡改造的二级管网比较,单位供热面积耗热功率降低15.9%,且低于非节能老小区的平均水平,改造效果良好。对于经水力平衡改造的二级管网用户:在二级管网实现水力平衡的前提下,楼内不同位置用户的室内温度依然存在差异,边角用户室内温度低于中间用户,上层用户室内温度高于低层用户室内温度。除二级管网水力平衡外,消除楼内用户室内温度差异是二级管网节能的重要方向。

Taking a heating system as an example,based on the monitoring data in February 2020,the operation of heat sources,primary heating network,heating station,secondary heating network,users and existing problems are analyzed.For the heat source and the primary heating network:the temperature of the heat source water supply changes with the outdoor temperature,and the mass flow of the primary heating network remains basically stable,indicating that the primary heating network operates in a constant flow regulation mode.For the heating station(all are heating stations with water-mixing connection):the heat consumption power per unit heating area of each heating station is uneven.Under the premise of ensuring the heating quality,different heating stations have different heat consumption per unit heating area and should be treated differently.The power consumption per unit heating area of each heating station varies greatly,which is mainly related to the form of water-mixing connection of the heating station.The heat consumption power per unit heating area basically decreases with the increase of the heating area of the heating station.The heat consumption power per unit heating area of non-energy-saving office buildings is the lowest,that of hotels and hospitals is slightly higher,and that of non-energy-saving old residential areas is the highest.For the secondary heating network:after the hydraulic balance transformation of the secondary heating network,the daily average return water temperature and the daily average temperature of supply and return water of each building are relatively close.Compared with the secondary heating network without hydraulic balance transformation,the heat consumption power per unit heating area is reduced by 15.9%,which is lower than the average level of non-energy-saving old residential areas,and the transformation effect is good.For users of the secondary heating network transformed by hydraulic balance:under the premise of achieving hydraulic balance in the secondary heating network,the indoor temperature of users at different locations in the building still differs,the indoor temperature of corner users is lower than that of intermediate users,and the indoor temperature of upper users is higher than that of lower users.In addition to the hydraulic balance of the secondary heating network,eliminating the indoor temperature difference between users in the building is an important direction for energy saving in the secondary heating network.