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The European Community has set a target for 20% of its energy consumption to come from renewable sources by 2020. One of the research projects set up to achieve this is Metrology for Biogas, a three-year program which began in June 2014. Its purpose is to devise and validate traceable methods for determining key impurities, moisture, particulates, calorific value, and density in biogas and bio-methane so it can be used as a mainstream alternative to natural gas.
VSL is working on the measurement of moisture and water dew point calibration. As an industrial collaborator, Michell Instruments has provided a moisture analyser – the OptiPEAK TDL600 – for assessment testing. It uses advanced tuneable diode laser absorption spectroscopy, to provide a fast response to changes in moisture concentration whilst being able to withstand the acidic nature of the biogas. Because the sensor uses laser light to measure moisture content, there is no contact between it and the biogas – meaning that there is no long-term degradation of performance or stability of the analyzer from the corrosive elements of the gas.
The tests have been conducted on three compositions representing biogas, with 20% concentration of carbon dioxide in methane, as well as processed biomethane with reduced CO2 concentrations including 100% methane. Moisture contents in the range 10 to 1,000 ppmV were generated within the VSL primary high-pressure humidity generator. Mr Andrea Peruzzi of VSL commented, ‘The Michell TDLAS analzyer proved helpful to further our understanding of the relationship of dew-point temperature to moisture concentration in biogas which exhibits non-ideal behaviour.’
The testing work is now complete, and the results will be published in a paper to be presented at NEN Gas Analysis, Rotterdam in June 2017.
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