ABSORPTION PROCESS FOR BIOGAS PURIFICATION AND FILLING INTO CYLINDERS FOR USING AS A TRANSPORT FUELRanjeet Singh and S.K. Mandal
The development of biogas purification and filling system for production of methane enriched biogas, which will substitute fossil fuel like petrol, diesel, LPG and CNG used in transport vehicles. Biogas can be used in automobiles after its purification (removing carbon dioxide, hydrogen sulfide and moisture present in it). A chemical purification and filling technology is developed at Kanpur gaushala society, Kanpur, based on chemical absorption of carbon dioxide in concentrated sodium hydroxide solution (15%). The purification system is able to remove carbon dioxide (97.7 % v/v) from biogas by passing into the scrubber and spraying concentrated sodium hydroxide solution from top of the scrubber in counter current action. Methane enriched biogas is passed through second scrubber where hydrogen sulfide is absorbed (100 % v/v) by iron oxide, then this biogas is passed through silica gel column to remove moisture by absorption, and the purified biogas is finally stored in reservoir which is joined by a three - stage compressor for filling in steel cylinders (as used in CNG filling). The methane enriched biogas cylinders are tested as a fuel in Maruti van successfully.
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