Yun, HAH, Ramírez-Solís, S and Dupont, V orcid.org/0000-0002-3750-0266 (2020) Bio-CH4 from palm empty fruit bunch via pyrolysis-direct methanation: Full plant model and experiments with bio-oil surrogate. Journal of Cleaner Production, 244. 118737. ISSN 0959-6526
Abstract
A promising, cleaner alternative process of thermochemical conversion of lignocellulosic biomass to biomethane is proposed and rigorously investigated via modelling and experiments for the first time. Using a conventional nickel on calcium aluminate catalyst, operated in bench scale at 1 atm, 400 °C, and with a feed molar steam to carbon ratio of 2, the Low Temperature Steam Reforming of acetic acid, representing a single compound bio-oil surrogate, achieves a promising 81.9% fuel carbon conversion to gases with a methane yield of 15.7 wt% of the feed. This compares to 21 wt% methane yield at equilibrium, thus demonstrating encouraging first time performance and scope for future catalyst optimisation. A comprehensive Aspen Plus model is developed for the first time for an industrial plant producing biomethane from palm empty fruit bunch (50 wt% initial moisture), an under-used agro-industrial waste produced in vast amounts in South-East Asia and Sub-Saharan Africa. Dependency on external heating is completely eliminated by heat recovered from combusting 25% of the gas product. Based on the simulation results of the autothermal plant, a final gas product consisting of 99.2 wt% of CH4 and 0.8 wt% of H2 is predicted with a plant thermal efficiency of 80.6%, i.e., comparable to modelled efficiencies found in the literature for wood gasification to biomethane plants that generate syngas as a necessary intermediate.
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Copyright, Publisher and Additional Information: | © 2019 Published by Elsevier Ltd. This is an open access article under the terms of the CC-BY 4.0 licence: https://creativecommons.org/licenses/by/4.0/ | ||||||
Keywords: | Synthetic natural gas (SNG); Biomethane; Palm empty fruit bunch (PEFB); Pyrolysis; Methanation; Acetic acid; Nickel | ||||||
Dates: |
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Institution: | The University of Leeds | ||||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) |
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Depositing User: | Symplectic Publications | ||||||
Date Deposited: | 08 Oct 2019 15:17 | ||||||
Last Modified: | 22 Jul 2020 22:04 | ||||||
Status: | Published | ||||||
Publisher: | Elsevier | ||||||
Identification Number: | https://doi.org/10.1016/j.jclepro.2019.118737 |