Simulation of cryogenic biogas upgrading using HYSYS

Abstract

Biogas is the gas resulting from the biodegradation of an organic substance when there is no oxygen. Biogas originates from organic matter and is a type of biofuel and is produced by anaerobic digestion or fermentation of biodegradable materials such as biomass, fertilizer, sewage, solid waste, green waste, plants and energy crops.  Due to the high percentage of carbon dioxide, the upgrades (removal of carbon dioxide) are complex and difficult. From this standpoint, this study focused on studying possible solutions for the upgrade process, as it will study the possibility of using the cryogenic method used in liquefaction of natural gas and its modification to meet the purposes of biogas promotion and separation of carbon dioxide This study concluded that this technique can be applied in separating carbon dioxide from biogas and promoting it to the level of natural gas despite the high percentage of carbon dioxide in biogas, as the proportion of carbon dioxide has  been reduced from 40% to less than 3%. The degree of purity of the methane gas has been raised from 60% to more than 97%.