超长距蒸汽供热管道保温性能分析

Analysis on the thermal insulation of long-distance steam heating pipes

针对热电联产蒸汽长距离运输过程中保温的问题,结合某管网工程,采用数值模拟的方法,研究了不同敷设方式管网的散热特性,并根据设计负荷计算了管网用户处的蒸汽参数。研究结果表明,在蒸汽供热管道中,空气层和土壤可一定程度上降低管道中蒸汽的热损失,对管道起到保温效果,直埋敷设管段的热损失要小于架空敷设管段。当管网负荷较低时,部分用户处会出现冷凝,负荷增大会使管道温降减小,压降增大。该研究为供热管道工程优化提供理论基础。

In order to solve the thermal insulation problem in the long-distance transportation of cogeneration steam,a pipe network project undertaken was simulated to study its heat dissipation characteristics under different laying schemes.And the steam parameters at the network's user side were calculated based on the design load.The simulation results show that laying an air layer and soil over the steam heating pipes can reduce the heat loss of the pipes to a certain extent,so as to improve the thermal insulation of the pipelines.The heat loss of the directly buried section is less than that of the overhead pipe section.Since the increase of the load will reduce the temperature drop of the pipe and increase the pressure drop,condensation will occur at some user ends when the load of the pipe network is low.This simulation facilitates the theoretical study on heating pipe allocation optimization.