基于弱反射光栅阵列的覆土储罐泄漏监测方法

Leakage Monitoring Method of Earth-Covered Storage Tank Based on Weak Reflection Grating Array

摘要:

储罐在覆土情况下,可能会因土壤压力导致罐体变形从而产生泄漏,故采取可靠的罐体泄漏在线监测技术,在确保储罐生产安全中显得尤为重要。为解决目前储罐泄漏安全监测存在的定位精度低、响应速度慢、监测范围小等问题,文章采用弱反射型布拉格光栅阵列(FBG)双波长波分/时分混合复用组网技术实现对覆土储罐表面温度全时、全域在线监测。FBG阵列测温精度为±1℃,传感器空间分辨率为1m,经过对覆土储罐两个月的数据监测和高压充水实验,分别验证了传感器在覆土情况下的长期稳定性和可靠性。结果表明,将FBG应用到储罐监测中,将有效提高储罐的生产安全性,具有较大的推广应用价值。

Abstract:

When the storage tank is covered with soil, the tank body may be deformed and leak due to soil pressure. Therefore, it is particularly important to adopt reliable online monitoring technology for tank leakage to ensure the safety of storage tank production. To solve the problems of low positioning accuracy, slow response time, and small monitoring range in the current storage tank leakage safety monitoring, this paper adopted a new generation of weak reflection fiber Bragg gratings (FBGs) dual-wavelength wavelength division/time division hybrid multiplexing networking technology to achieve full time and full area online monitoring of the surface temperature of earth-covered storage tanks. The temperature measurement accuracy of the FBGs array was ±1℃, and the spatial resolution of the sensor was 1m. After two months of data monitoring and high-pressure water filling experiments on the earth-covered storage tanks, the long-term stability and reliability of the sensor in the earth-covered situation were verified. The results show that the application of FBGs to storage tank monitoring will effectively improve the production safety of storage tanks and has great value for promotion and application.