Modelling and Simulation of Retentate-Permeate Recycle Premeator for the Enrichment of Methane

Abstract

Ketulenan komponen kurang telap (CH₄) boleh dipertingkatkan dengan menggunakan penelap kitar semula bendalir tertelap-tertahan. Sebuah model matematik telah dibangunkan dan kesan parameter terhadap ketulenan dan pemulihan aliran sisa telah dikaji melalui penyelakuan. Penahan didapati lebih berkesan digunakan pada keadaan nisbah tekanan yang rendah, komposisi komponen kurang telap yang rendah dalam suapan, dan kememilihan unggul yang tinggi. Terdapat juga satu julat optimum bagi luas membran tak berdimensi supaya penelap kitar semula boleh beroperasi dengan berkesan. Kebolehgunaan penelap ini dalam pengayaan metana daripada biogas dan gas asli turut dipertimbangkan. Penelap kitar semula didapati berpotensi untuk digunakan dalam pengayaan metana daripada biogas. Kata kunci: Membran; penelap; pengayaan metana; biogas; pemodelan; penyelakuan The purity of less permeable component (CH₄) can be enhanced by using a retentate-permeate recycle permeator. A mathematical model has been derived and the effect of some parameters on the retentate purity and recovery have been studied through simulation. The retentate-permeate recycle permeator has been found to be more effective at low pressure ratio, low composition of the less permeable component in the feed, and large ideal selectivity. There is an optimal range of dimensionless membrane area for effective recycle. The applicability of retentate-permeate recycle permeator in enrichment of methane from biogas and natural gas has been considered. It was found that the retentate-permeate recycle permeator has the potential to be used in enrichment of methane in biogas. Key words: Membrane; permeator; methane enrichment; biogas; modelling; simulation