摘要
燃气加臭是保证燃气安全使用和运输的重要环节,直接关系到用户能否第一时间察觉燃气泄漏,燃气管网中的四氢噻吩浓度在线检测对保证用户端加臭剂浓度合格十分重要。针对燃气管网中四氢噻吩浓度在线检测问题,以MSP430为控制核心,电化学传感器为检测手段设计了一款低成本、高可靠性的在线检测仪。首先分析了电化学传感器检测混合气体时的交叉干扰特性并建立了交叉干扰数学模型,对电化学传感器在线检测时易中毒的缺点提出优化方案;其次,开发了检测仪的硬件和软件部分,并采用双重防爆外壳设计确保其在燃气环境下的使用安全;最后在实验室环境下进行了检测仪的标定与性能检定实验,同时在现场完成了与气相色谱仪的比对实验。实验结果表明,所设计的四氢噻吩在线检测仪真实值与测量值之间具有较好的线性关系,直线趋势拟合的程度指数R2=0.996。与此同时检测仪在响应时间、稳定性、重复性、高低温交变以及气源压强影响测试等检定实验测试中均具有良好的测试结果,其中量程漂移为0.7%,重复性RSD为1.88%,示值误差为1.10%,检测精度达到4.0级,可以实现压力0.1~0.3 MPa,温度-10℃~40℃的环境下对天然气四氢噻吩浓度的在线测量。研究为解决燃气管网四氢噻吩浓度在线检测问题提供了科学可靠的依据和手段,对保证燃气管网的安全运行和燃气用户的生命财产安全具有重大意义。
Gas odorization is an important step in ensuring the safe use and transportation of gas.It is directly related to whether users can detect gas leaks in the first time.Online detection of tetrahydrothiophene concentration in the gas pipeline network is very important to ensure that the concentration of odorants at the user end is qualified.This article focuses on the problem of online detection of tetrahydrothiophene concentration in gas pipeline networks.A low-cost and high reliability online detection instrument is designed with MSP430 as the control core and electrochemical sensors as the detection method.Firstly,the cross interference characteristics of electrochemical sensors in detecting mixed gases were analyzed,and a mathematical model of cross interference was established.An optimization scheme was proposed to address the disadvantage of electrochemical sensors being prone to poisoning during online detection.Secondly,the hardware and software parts of the detector were developed.In addition,the detector adopts a dual explosion-proof housing design to ensure its safe use in gas environments.Finally,calibration and performance verification experiments were conducted on the detector in a laboratory environment,and a comparison experiment with a gas chromatograph was completed on site.The experimental results show that there is a good linear relationship between the true value and the measured value of the tetrahydrothiophene online detector designed,and the degree index R2 of the linear trend fitting is 0.996.The detector has shown good response performance in response time,Stability,repeatability,high and low temperature alternation,and the influence of gas source pressure test in the calibration experiment,with a range drift of 0.7%,repeatability RSD of 1.88%,indication error of 1.10%,and detection accuracy of 4.0 level.It can realize accurate measurement of tetrahydrothiophene concentration under gas environment with pressure 0.1~0.3 MPa and temperature-10℃~40℃.To solve the problem of gas pipe network tetrahydrothiophene concentration detection provides a scientific and reliable basis and means to ensure the safe operation of the gas pipe network and gas users’life and property safety is of great significance.
作者
葛亮
徐一鹏
肖小汀
母小琳
马乐
Ge Liang;Xu Yipeng;Xiao Xiaoting;Mu Xiaolin;Ma Le(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;School of Electric and Information,Southwest Petroleum University,Chengdu 610500,China)
出处
《电子测量与仪器学报》
北大核心
2025年第7期247-258,共12页
Journal of Electronic Measurement and Instrumentation
基金
西南石油大学自然科学“启航计划”项目(2023QHZ003)
南充市与西南石油大学市校科技战略合作项目(23XNSYSX0022/23XNSYSX0026)
四川省科技计划项目(2023ZHCG0020)
四川省国际港澳台科技创新合作项目(2025YFHZ0218/25GJHZ0475)资助。
关键词
气体浓度在线检测
燃气管网
燃气加臭
四氢噻吩
燃气安全
online detection of gas concentration
gas pipeline network
gas odorization
tetrahydrothiophene
gas safe
