摘要
埋地供热管道发生小规模泄漏时,泄漏工质首先进入聚氨酯保温层中,此过程是研究泄漏工质进入周围土壤环境进行热质传递的重要基础。根据供热管道泄漏的实际情况,搭建了用于模拟实际管段泄漏的实验系统,建立了用于描述泄漏工质在保温层中渗流特性的三维数学模型并利用实验数据验证了其准确性。在此基础上,模拟分析了管道入口压力、泄漏孔径、泄漏孔朝向等因素对泄漏工质在保温层中渗流特性的影响。研究结果表明:泄漏工质在保温层中的压力与速度随管道入口压力与泄漏孔径的增大而增大,泄漏孔朝向越趋于管道正下方,泄漏工质在保温层中的压力与速度越大。管道入口压力对于泄漏工质在保温层中流动特性的影响最大、泄漏孔径次之、泄漏孔朝向对其影响最小。本文为完整研究管道泄漏过程及其检测领域提供了理论基础。
When a small scale leakage occurs in buried heating pipeline, the leakage media first enters into polyurethane insulation layer. This process is important to study the heat and mass transfer of leakage media into the surrounded soil environment. An experimental system was established to simulate the pipeline leakage according to the actual situation of heating pipeline leakage, and a corresponding three-dimensional mathematical model was also established and its accuracy was verified by experimental data. On this basis, the influence of inlet pressure of the pipeline, leakage aperture and leakage hole’s position on the seepage characteristics of leakage media in the insulation layer was analyzed by this model. The results showed that the pressure and velocity in the insulation layer increased with the increase of inlet pressure of the pipeline and leakage aperture, and the more the direction of the leakage hole’s position tends to be directly below the pipeline, the greater the pressure and velocity of the leakage media are. The inlet pressure of the pipeline has the greatest influence on the flow characteristics of leakage media in the insulation layer, followed by the leakage aperture and the position of the leakage hole. This paper can provide a theoretical basis for the complete study of buried heating pipeline leakage process and its detection.
作者
刘联胜
魏朝阳
王晓雪
高忠旺
张春来
董生启
LIU Liansheng;WEI Zhaoyang;WANG Xiaoxue;GAO Zhongwang;ZHANG Chunlai;DONG Shengqi(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Chengde Heating Group Co.ltd,Chengde,Hebei 067000,China)
出处
《河北工业大学学报》
CAS
2023年第1期50-57,共8页
Journal of Hebei University of Technology
基金
天津市科技计划项目(19YFZCSF00850)
河北省重点研发计划(19274502D)。
关键词
供热管道
聚氨酯保温层
泄漏工质
数值模拟
渗流特性
heating pipeline
polyurethane insulation
leakage media
numerical simulation
flow characteristics
