National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Energy content of biogas is directly proportional to the methane concentration thus, removing impurities increases the energy content of the gas so that it can be used as vehicle fuel or pooled into gas grid. Removing impurities is regarded as biogas upgrading, in doing so, cryogenic method is among different enrichment methods. Cryogenic method involves the subsequent compression and expansion of biogas until the suitable pressure and temperature is attained (in other words until the required purity is attained). With this method the suitable temperature and pressure to remove CO2 and H2S are calculated to be 215K and 1MPa respectively. At this point while CO2 and H2S are in their liquid state, CH4 exists in its gaseous state. Under these conditions, CO2 and H2S are removed from the system under the action of gravity. The minimum work done to compress the gas is 0.5MJ/kg.
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