Abstract
A method to directly use biogas as a gaseous energy source was investigated. Utilizing this method, a prototype “refining-compression-filling (RCF) facility” for biogas, which uses membrane separation, was developed. The facility forms the core of a system for supplying dairy farms and facilities in suburbs with energy by filling gas cylinders with biogas reformed to a high calorific value. The recovery rate of methane from the biogas achieved by this prototype is about 80%, and for mass production of equipment, the officials and manufacturers in municipalities introducing the facility have requested further improvement in the methane-purification efficiency of the RCF facility. The purpose of this study was to establish optimal arrangements of the membrane module unit for improving the methane-purification efficiency of the biogas-dedicated purification RCF facility. The results of this study showed that a combination of three membrane modules arranged in series (a “three-stage-module in-series type”) was found to effectively increase the methane concentration to about 99%. To further increase methane-recovery rates, a module configuration that combines the series and parallel arrangements of modules (“three-stage-module composite type”) was found to effectively increase the methane recovery rate to approximately 95%.
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