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Techno-economic performance analysis of biomass-to-methanol with solid oxide electrolyzer for sustainable bio-methanol production
(2024-12-30)
Detchusananard, Thanaphorn
;
Wiranarongkorn, Kunlanan
;
Im-orb, Karittha
The analysis of the technical and economic performance of an integrated biomass to methanol and solid oxide electrolysis process (BtM-SOEC) is studied to find more sustainable process of bio-methanol production. The oil palm empty fruit branch (EFB) which is abundant in Thailand is used as biomass feedstock. Modeling of the BtM-SOEC is done using Aspen Plus. For technical aspects, the production rate of oxygen and hydrogen from the SOEC can be enhanced through an appropriate adjustment of the number of cells and cell temperature. The BtM-SOEC offers higher methanol yield and overall efficiency, while consumes less energy than the conventional biomass to methanol process (BtM). The maximum methanol production rate of 0.4995 kmol hr−1 derived from BtM-SOEC is achieved at a number of cells of 325 cells and a cell temperature of 700 °C, at this condition the overall efficiency is 64.79 %. The economic assessment indicates that the conventional BtM and BtM-SOEC are still not economically feasible. However, the conventional BtM is more economically feasible than the BtM-SOEC. The methanol cost of BtM-SOEC can turn out to be economically feasible when renewable electricity cost and SOEC cost decrease substantially. The methanol cost of the BtM-SOEC (620 USD ton−1) can be competitive to that of the BtM (703 USD ton−1) when the cost of input renewable electricity decreases by 80 %. Consequently, this research highlights the potential of BtM-SOEC from agricultural residues for sustainable bio-methanol production in the future market condition that the cost of renewable electricity tends to continuously decrease with the technology development and increased technology adoption and the carbon policy tends to be tightened to relieve global warming.
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Sustainability analysis of the bio-dimethyl ether (bio-DME) production via integrated biomass gasification and direct DME Synthesis Process
(2023-05-01)
Im-orb, Karittha
;
Piroonlerkgul, Pakorn
The sustainability analysis based on life cycle assessment (LCA) of bio-dimethyl ether (bio-DME) production via an integrated biomass gasification and direct DME synthesis (IBG-DME) process, using oil palm residue as feedstock, was performed. The IBG-DME process was simulated in Aspen plus. Operating at selected condition, the IBG-DME was an exothermic process, whereas for 1 kg h−1 of oil palm trunk, bio-DME of 0.3456 kg h−1 and bio-methanol of 0.015 kg h−1 were produced as main product and by product, respectively, with energy efficiency at 59.5%. The energy consumption increased as gasifying temperature increased and reached thermal self-sufficient condition at approximately 890 °C but the CO<inf>2</inf> emission showed opposite trend. LCA result indicated that the carbon footprint of each unit operation relied on the energy consumption. For biomass gasification section, the global warming potential (GWP) accounted for approximately 91% of the total impact. The DME production section highly contributed toward the ozone depletion potential (ODP), eco-toxicity (ET), and human toxicity-non-carcinogenics (HTNC) whereas the syngas cleaning and conditioning section highly contributed toward GWP, human toxicity potential by ingestion (HTPI), and aquatic toxicity potential (ATP). The endpoint impact on the ecosystem were higher than the human health for all process sections.

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