oa South African Journal of Chemical Engineering - Process simulation and parametric study of a biogas upgrading plant using gas permeation technique for methane enrichment
An operational biogas upgrading plant with cleaning process and methane (CH4) enrichment has been presented in this study. Parametric study was carried out to investigate the effect of varying the operating conditions on CH4 recovery, product purity and gas processing cost (GPC). Double stage with permeate recycle gave a good approximation of the plant upgrading result. An increase in %CO2 in the feed composition from 10-60% reduces the CH4 recovery by 4.1%. Increase in membrane selectivity from 5.6 to 33.33 increased CH4 recovery by 7.11% and reduced the membrane area required for separation by 47.73%. Pressure increase also increased CH4 recovery up to the module design configuration limit. Increasing feed flow rate from 80-140m3/h increased CH4 recovery by 6.2% with 2.6% increase in membrane area. The GPC at optimal condition was $0.36/Nm3 with 96% CH4 recovery and 91% product purity.
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