摘要
磷酸铁锂电池因其较长的使用寿命和环保性,被广泛应用于储能系统。然而,近年来,储能电站安全事故频发,给电网稳定运行造成了威胁。在热失控过程中,磷酸铁锂电池会产生C_(2)H_(2)和C_(2)H_(6)等可燃气体,是造成燃烧、爆炸等灾害的重要原因。因此,实时准确监测储能预制舱内C_(2)H_(2)和C_(2)H_(6)等可燃气体的浓度是保障其安全稳定运行的关键。文中提出一种基于开放光路光纤环形腔衰荡光谱(fiber loop ring-down spectroscopy,FLRDS)技术的气体检测方法,可实现自由空间内微量气体在线监测。对梯度折射率(gradient index,GRIN)透镜的空间光耦合光学损耗进行理论和实验分析,建立插入损耗为0.95 dB的开放光路FLRDS气体检测系统。根据C_(2)H_(2)和C_(2)H_(6)红外光谱特性,开展激光光源性能测试。模拟开放空间气体环境研究了C_(2)H_(2)和C_(2)H_(6)的气体浓度检测方法,结果表明,该系统具有较好的稳定性,N_(2)背景下测量信号标准偏差S仅为平均值的0.156%。衰荡时间与气体浓度之间存在良好的线性关系,C_(2)H_(2)线性拟合度R2为0.99832,C_(2)H_(6)线性拟合度R^(2)为0.99472。反演计算结果表明,C_(2)H_(2)和C_(2)H_(6)的最大相对误差分别为3.215%和4.72%,最大绝对误差分别为16.86μL/L和12.74μL/L,测量精度良好。
Lithium iron phosphate batteries have been widely used in energy storage system because of the long service life and environmental protection.However,in recent years,there are many safety accidents in the energy storage power station,which threaten the stable operation of the power grid.In the process of thermal runaway,lithium iron phosphate batteries will produce combustible gases such as C_(2)H_(2) and C_(2)H_(6),which is an important cause of combustion,explosion and other disasters.Therefore,real-time monitoring of combustible gases such as C_(2)H_(2) and C_(2)H_(6) in the prefabricated cabin can ensure the safe and stable operation of the battery.In this paper,a fiber loop ring-down spectroscopy(FLRDS)technology based on open optical paths is proposed,which can realize on-line monitoring of trace gas in open space.The optical loss of gradient index(GRIN)lens is analyzed theoretically and experimentally.An open optical path FLRDS gas detection system with an insertion loss of 0.95 dB is established.According to the infrared spectral characteristics of C_(2)H_(2) and C_(2)H_(6),the performance test of laser source is carried out.The gas concentration detection methods of C_(2)H_(2) and C_(2)H_(6) are studied by using the simulated open space.The results show that the system has good stability,and the standard deviation S of the measured signal under N_(2) background is only 0.156% of the average value.There is a good linear relationship between ring-down time and concentration.R 2 of C_(2)H_(2) is 0.99832,R^(2) of C_(2)H_(6) is 0.99472.The results of the inversion calculation show that the maximum relative errors of C_(2)H_(2) and C_(2)H_(6) are 3.215% and 4.72%.The maximum absolute errors are 16.86μL/L and 12.74μL/L.The research proves that the method has good measurement accuracy.
作者
张引
蔡逸杰
李晓涵
张晓星
王邸博
卓然
ZHANG Yin;CAI Yijie;LI Xiaohan;ZHANG Xiaoxing;WANG Dibo;ZHUO Ran(Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment,Hubei University of Technology,Wuhan 430068,China;CSG Electric Power Research Institute Co.,Ltd.,Guangzhou 510080,China;United Laboratory of Advanced Electrical Materials and Equipment Support Technology,CSG,Guangzhou 510080,China)
出处
《电力工程技术》
北大核心
2023年第5期56-62,共7页
Electric Power Engineering Technology
基金
南方电网公司先进电工材料与装备基础联合实验室开放基金项目资助。
