| Combustible gas detectors play an important role and significance in leakage detection of combustible gases.When gas leaks occur,they can sound an alarm,which is crucial for protecting life and property safety.In practical applications,external environmental conditions such as high and low temperatures,wind speed,rain and snow,etc.,affect the function and performance of detectors,which may lead to fire and explosion accidents.Moreover,the environment faced during actual monitoring is often not a single one,but usually a composite of high and low temperatures,wind,rain,snow,etc.Existing research on the adaptability of combustible gas detectors focuses on the sensors of the detector,and the environmental conditions tested are only single natural environments.There is a lack of performance research on combustible gas detectors under complex environmental conditions,especially in test research.There is also a lack of comprehensive performance evaluation of combustible gas detectors’ adaptability under complex environmental conditions.This study analyzes the various complex environments that detectors may encounter in practical use,and uses relevant testing platforms to simulate various natural environments.Methane is selected as the typical combustible gas,and laser combustible gas detectors(combustible gas monitors and industrial combustible gas detectors)are selected as the research objects to conduct environmental adaptability tests.The study investigates the effect of methane readings on the combustible gas monitor and the effect of methane readings and alarm time on the industrial combustible gas detector.It constructs an environmental adaptability index system for combustible gas detectors under complex conditions and combines it with the experimental data of environmental adaptability tests to conduct case analysis.Finally,the study uses the Analytic Hierarchy Process-Fuzzy Comprehensive Evaluation method to conduct a comprehensive evaluation of the laser combustible gas detector.The results show that:(1)In the adaptability test of combustible gas monitoring instruments for urban lifelines,the methane indication monitored by the instruments decreases overall as the temperature decreases below-5℃.The measurement error is larger than that of working ambient temperature at temperatures below-25℃ and above 65℃.Under environmental conditions of 10～80℃,the battery voltage remains stable,but it drops at temperatures between-35℃and-25℃.Single disaster environments such as rain,snow,and icing have a relatively large impact on the performance of the combustible gas monitoring instrument,while composite environmental conditions such as wind,high and low temperatures,rain,icing,and snow have a greater impact.However,the battery is not affected,and is mainly influenced by temperature changes.(2)The combustible gas detector performs best when monitoring methane in the temperature range of 15～25℃.High temperature environments have a significant impact on measurement accuracy,and temperature also affects the alarm time of the detector.Under conditions of 20℃ temperature and 0.5～3m/s wind speed,the methane concentration reading decreases as the wind speed increases,with greater error,but the detector’s monitoring performance is good in this environment;the alarm time is shortest under conditions of 20℃ and 0.8m/s wind speed.The optimal environmental conditions for using the combustible gas detector are temperature range of 15～25℃ and wind speed of 0.5～1m/s,which provides the highest measurement accuracy and fastest alarm time.(3)The comprehensive evaluation of the laser combustible gas detector in a complex environment using the AHP-Value Function method scored more than 80,which is consistent with the experimental conclusion,proving that the constructed comprehensive evaluation method of combustible gas detectors is reasonable and feasible.Figure [ 36 ] Table [ 31] References [ 63 ]... |
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