PVC管低温传热特性及高效输冷应用研究  

Study on Cryogenic Heat Transfer Features and High Efficient Cooling Transfer Application of PVC Pipe

作　　者：李方政[1,2] 张松 崔兵兵 丁航 

机构地区：[1]北京中煤矿山工程有限公司,北京100013 [2]煤炭科学研究总院建井研究分院,北京100013

出　　处：《建井技术》2017年第1期18-23,共6页Mine Construction Technology

基　　金：北京市科技计划资助项目(Z151100002815023)

摘　　要：为探究PVC管输送低温盐水的可行性,首先通过PVC管约束条件下的温度应力试验,获得了PVC管低温收缩应变增长规律及线膨胀系数,为低温管路收缩节设计提供依据。然后对PVC管路横截面温度场进行了数值模拟,结果显示:冻结前20d内,PVC盐水管壁温度随时间的延长,成对数规律分布,外壁温度比管内盐水温度高3~12℃;与同条件下的钢管相比,PVC管保温层中心点温度高出1.5~4℃。PVC管输送低温盐水,千米温差小于0.5℃,冷量散失量仅为同条件钢管的42.3%左右,节能效果显著,值得推广应用。In order to investigate the feasibility of low temperature brine transportation with PVC pipe,a temperature stress test was passed under the constraint condition of the PVC pipe,the low temperature shrinkage strain increased law and linear expansion coefficient of the PVC pipe were obtained and could provide the basis to the design of the shrinkage joint in the low temperature pipeline.Then a numerical simulation was conducted on the cross-section temperature field of the PVC pipeline.The results showed that within 20 days before the freezing operation,the temperature of the PVC brine pipe wall would be distributed in a logarithm law with the time passed and the outer wall temperature would be 3~12 ℃ higher than the brine temperature within the pipeline.In comparison with the steel pipe under the same condition,the central point temperature of the PVC pipe thermal insulation layer would be 1.5~4 ℃ higher than the steel pipe.When the low temperature brine was transported with the PVC pipeline,a temperature difference per 1 000 mwould be less than 0.5℃and a dissipated value of the cooling capacity would be only about 42.3% of the steel pipe under the same condition.Thus the energy saving effect of the PVC pipeline was obvious and the promotion and application would be valuable.

关 键 词：PVC管 盐水干管 高效输冷 温度场 水密性 

分 类 号：TD265.33[矿业工程—矿井建设]