燃气管道埋地甲烷监测装置研制和实验验证

Development and Experimental Verification of Buried Methane Monitoring Device for Gas Pipeline

收集整理城市燃气管道泄漏事件报告单,并在发现泄漏的燃气管道上方进行打孔实验,对比检测孔内与地面的甲烷体积分数,二者之比最高达2 750,有必要对土壤内的甲烷体积分数进行实时监测。研制埋地甲烷监测装置,将其安装于土壤中的检测筒内。埋地甲烷监测装置由防水透气壳、甲烷传感器、供电及远传模块组成。设计防水透气壳,对比分析半导体传感器、催化燃烧传感器及红外线传感器的性能,在设计的实验箱内进行实验验证。实验温度为-5～40℃,温度间隔为5℃,每个温度分别对应4个相对湿度:25%、50%、75%、100%。结果表明:催化燃烧传感器在不同的温度、湿度环境下性能较稳定;将埋地甲烷监测装置置于土壤中的检测筒内,可先于路面发现燃气泄漏。

The city gas pipeline leakage incident reports are collected and collated,and a drilling experiment is carried out over the leaked gas pipeline. The methane volume fraction in the detection hole is compared with that on the ground,and the ratio of the both is up to 2 750 times. Therefore,it is necessary to monitor the volume fraction of methane in soil in real time. The buried methane monitoring device is developed and installed in the detection cylinder in the soil. The buried methane monitoring device consists of water-proof air permeable shell,methane sensor and power supply and remote transmission module. The water-proof air permeable shell is designed,the performance of semiconductor sensor,catalytic combustion sensor and infrared sensor is compared and analyzed,and the experimental verification is carried out in the designed experimental box. The test temperature is -5 ℃ to 40 ℃,the temperature interval is 5 ℃,and each temperature corresponds to four relative humidities （25%,50%,75% and 100% respectively）. The results show that the catalytic combustion sensor has a stable performance under different temperature and humidity environments. The buried methane monitoring device is placed in the detection cylinder in the soil to detect the gas leakage before the road surface.