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Design of a Methane Monitoring System for Landfill and Duct Emissions

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Document pages: 10 pages

Abstract: Methane is released from waste disposal areas as a result from anaerobicdecay of food. Methane causes more greenhouse effects than carbon dioxide so amethane monitoring system is required to warn its release from gas emittingenvironments. The low explosive limit of methane is 5 in ambient air, so gasleakage is dangerous and can produce explosions. An entire head monitoringsystem 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 CH4 emissions in ducts, CH4 in landfills at different depths and even incattle barns. The measuring system head consists of a suction pump, solenoids,and a methane sensor. Measurements are taken 13 seconds after methane gassucking. A timing of 100 seconds is requiredfor purging the chamber before the second solenoid is turned-on. Devicestemperature during operation was sampled with a thermal Flir-One camera andsolenoid coil temperature was of 24.9˚C after a continuous operation of 30seconds. As hoses for emission sampling become larger time for samplingincreases as well as energy consumption.

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