蒸汽热网热力损失与管损特性实验研究

Experimental study on characteristics of thermal andpipeline loss of steam heating pipeline network

采用焓降法和表面热流法,分别对实际运行的蒸汽热网特性进行现场测试,分析得到热网散热损失特性和组成特征.结果表明,运行工况和蒸汽状态对焓降法在评估供热管道散热损失中的准确性具有重要的影响.所测热网的实际散热热流密度达到135.66 W/m2,其中管道保温散热为67.67 W/m2,约占49.88%;蒸汽流动阻力损失占14.98%,支架、弯头、疏水器等局部散热占35.14%.基于实际管损与热网冷凝散热损失的关系,定义热网冷凝损失系数.建立基于热网散热损失的管损模型,结合实际测量数据,得到该热网的冷凝损失系数为0.16.

The characteristics of steam heat network in actual operation were tested using enthalpy drop method and surface heat flow method.Heat loss characteristics and composition characteristics of the heating network were analyzed.Results showed that operating conditions and steam state greatly influenced on the accuracy of enthalpy drop method in evaluating heat loss of steam heating pipe.The actual heat rate of heat supply network was 135.66 W/m2,of which the heat rate of pipeline insulation was 67.67 W/m2,accounting for about 49.88%.The steam flow resistance loss accounted for 14.98%,and the local heat loss of supports,elbows and traps accounted for 35.14%.The condensation loss coefficient of the heat supply network was defined based on the relationship between actual pipe loss and condensation loss of the heat supply network.Heat loss model was constructed based on heat loss of the heat supply network combined with actual measurement data.The condensation loss coefficient of the heat supply network was 0.16.