Design of a Methane Monitoring System for Landfill and Duct Emissions

• 作者: Federico Hahn Gaudencio Grande
• 来源期刊: 自然资源(英文)
• 学科: 化学
• 关键词: Methane Detection MQ-4 Sensor Monitoring Head Current Consumption
• 年，卷（期）: 2020,（11）
• 页码范围: 520-529
• 页数: 10页
• 分类号: O64

摘要

<span style="font-family:;" "=""><span style="font-family:Verdana;">Methane is released from waste disposal areas as a result from anaerobic decay of food. Methane causes more greenhouse effects than carbon dioxide so a methane monitoring system is required to warn its release from gas emitting environments. The low explosive limit of methane is 5% in ambient air, so gas leakage is dangerous and can produce explosions. An entire head monitoring system was built around a MQ-4 methane gas sensor as it is cheap and reliable. The design proves to be flexible enough as it can measure CH</span>_{<span style="font-family:Verdana;">4</span>}<span style="font-family:Verdana;"> emissions in ducts, CH</span>_{<span style="font-family:Verdana;">4</span>}<span style="font-family:Verdana;"> in landfills at different depths and even in cattle barns. The measuring system head consists of a suction pump, solenoids, and a methane sensor. Measurements are taken 13 seconds after methane gas sucking. </span><span style="font-family:Verdana;">A timing of 100 seconds is required for purging the chamber before the</span><span style="font-family:Verdana;"> second solenoid is turned-on. Devices temperature during operation was sampled with a thermal Flir-One camera and solenoid coil temperature was of 24.9</span></span><span style="font-family:;" "=""><span style="font-family:Verdana;"><span style="white-space:nowrap;">&#730;</span>C </span><span style="font-family:Verdana;">after a continuous operation of 30 seconds. As hoses for emission sampling</span><span style="font-family:Verdana;"> become larger time for sampling increases as well as energy consumption.</span></span>