基于共面电容测量的PE材料老化程度测量方法研究  

Study on the Aging Degree Assessment Method for PE Materials Based on Coplanar Capacitance Measurement

作　　者：文近来 李强 李学楠 代志双 刘军 薛欣悦 韩宗凯 殷晓康 WEN Jinlai;LI Qiang;LI Xuenan;DAI Zhishuang;LIU Jun;XUE Xinyue;HAN Zongkai;YIN Xiaokang(Tianjin Branch of CNOOC(China)Co.,Ltd.,Tianjin 300459,China;CNOOC(Tianjin)Pipeline Engineering Technology Co.,Ltd.,Tianjin 300452,China;College of Mechanical and Electrical Engineering,China University of Petroleum(East China),Qingdao Shandong 266580,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459 [2]中海油(天津)管道工程技术有限公司,天津300452 [3]中国石油大学(华东)机电工程学院,山东青岛266580

出　　处：《传感技术学报》2024年第10期1709-1716,共8页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(52075549);泰山学者工程项目(202312136)。

摘　　要：海洋复合软管在海洋油气输送过程中起着至关重要的作用。管内服役环境中热源及液态介质浸润会导致内衬层材料老化降解。由于材料老化与其介电常数的变化相关,共面电容传感器可原位测量电容以反映材料的老化程度。介绍了共面电容传感器测量原理和有限元仿真分析,研究了交联聚乙烯(XLPE)和耐温聚乙烯(PERT)两种PE材料在热老化过程中的介电性能变化。对于老化与未老化样品,在1 kHz~1 MHz的频率范围内测量并联电容值C_(p),研究了老化温度、老化环境及老化时间对材料介电性能的影响。研究结果表明,PE材料的C_(p)随着老化温度的升高而略微增加,每10℃变化约0.005 pF;相较于水浸润环境下,柴油浸润环境加速老化对PE材料介电性能影响更大;加速老化时间越长,PE材料的C_(p)越大;相同老化条件下,XLPE的C_(p)变化量比PERT小,PERT对老化条件变化更敏感。实验结果证明了所提出的PE材料老化程度测量方法的可行性。Subsea composite flexible pipeline plays a vital role in the offshore oil and gas transportation process.Heat sources and fluid ingress in the flexible pipes operating environment can cause aging and degradation of the liner material.Since material aging is related to the change in its dielectric constant,coplanar capacitance sensors can measure the capacitance in situ to reflect the degree of material aging.The measurement principle and finite element simulation analysis of coplanar capacitance sensors are presented,and the changes in the dielectric properties of two PE materials,i.e.,cross-linked polyethylene(XLPE)and temperature resistant polyethylene(PERT),during thermal aging,are investigated.For the aged and unaged samples,the parallel capacitance values are measured in the frequency range of 1 kHz~1 MHz and the effects of aging temperature,aging environment and aging time on the dielectric properties of the materi als are investigated.The results show that the dielectric properties of PE materials increase slightly with the increase of aging tempera ture,with a change of about 0.005 pF per 10℃.Accelerated aging in diesel-infiltrated environment has a greater effect on the dielectric properties of PE materials compared to water-infiltrated environment.The longer the accelerated aging time,the greater the dielectric properties of PE materials.The amount of change in XLPE is smaller than that of PERT under the same aging conditions,and PERT is more sensitive to changes in aging conditions.The experimental results prove the feasibility of the aging degree measurement method of PE materials proposed.

关 键 词：叉指电容 聚乙烯材料 加速热老化 介电常数 

分 类 号：TH878[机械工程—仪器科学与技术]