Study on the influence of oil fume on methane alarm response characteristics in catalytic combustion
The accurate detection of methane alarms can prevent fire and explosion accidents caused by methane gas leakage,but a harsh environment like lampblack will have an impact on its alarm effect.Given the above problems,the influence of oil fume on the response characteristics of catalytic combustion methane alarm,such as range indication deviation,alarm threshold,and alarm repeatability,is analyzed.The results show that,compared with the environment without oil fume,the range indication deviation will be larger in the smoky environment.When the tank methane concentration is 12%LEL,the range indication deviation of the methane alarm is increased by 4.95%when the oil fume concentration is 7.30 mg/m3.In addition,compared with the environment without oil smoke,the alarm threshold will increase in the environment without oil fume.When the oil fume concentration is 7.30 mg/m3,the alarm threshold increases by4.01%compared with that without oil fume.At the same time,the influence of fume and temperature coupling environment on the response characteristics of methane alarm is also studied,and it is found that with the increase of environmental temperature,the range indication deviation and the alarm threshold both increase.This study provides an experimental basis for further solving the impact of lampblack on methane gas alarm,which is conducive to improving the accurate detection of methane gas leakage so as to prevent the occurrence of fire and explosion accidents and ensure the safety of urban lifeline.
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