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Assessment of bio-methanol and electricity co-production via the integration of biomass-to-methanol process, solid oxide electrolyzer, and power generator
(2025-11-01)
Detchusananard, Thanaphorn
;
Wiranarongkorn, Kunlanan
;
Im-orb, Karittha
The performance assessment of an integrated biomass to methanol and solid oxide electrolyzer with and without a power generation unit (BtM-SOEC-PG and BtM-SOEC), utilizing purge gas from BtM for production of bio-methanol and electricity, is performed. For BtM-SOEC-PG, two utilization routes of low pressure (LP) steam leaving the power generation system (case 1: LP steam is exported to external users (BtM-SOEC-PG-LPEX) and case 2: LP steam is utilized in the process (BtM-SOEC-PG-LPUT)) are examined to determine the impact on process performance of recycling purge gas from BtM to either the methanol reactor or the power generation unit. In all cases, the bio-methanol production increases with increased purge gas recycling, whereas the power generation decreases. The direct CO<inf>2</inf> emissions are also improved with increased recycling. Two BtM-SOEC-PG cases are an exothermic process, and the degree of exothermicity increased with purge gas recycling. However, the BtM-SOEC-PG-LPUT with 90 % purge gas recycling offers a maximum methanol production rate of 15.99 kg/h, and under these conditions, 3.17 kW of electricity is generated and 56.18 % energy efficiency is obtained. The energy efficiency of the BtM-SOEC-PG-LPUT, with 90 % purge gas recycling, could potentially be enhanced by 10.42 % due to pinch analysis and heat exchanger network (HEN) design. Exergy analysis indicates that the gasifier is the primary unit of exergy destruction, followed by the combustion unit and the autothermal reformer (ATR) in the second and third positions, respectively. Furthermore, the BtM-SOEC-PG-LPUT with 90 % purge gas recycling offers a competitive cost of bio-methanol (824.37 USD/ton) compared to BtM-SOEC.
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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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Process and sustainability analyses of the integrated biomass pyrolysis, gasification, and methanol synthesis process for methanol production
(2020-02-15)
Im-orb, Karittha
;
Arpornwichanop, Amornchai
Technical and sustainability analyses of the methanol production via the integrated biomass pyrolysis, gasification, and methanol synthesis (IBPGM) process using rice straw as feedstock, are performed. The utilization of emitted CO<inf>2</inf> by recycling to a gasifier as a gasifying agent is investigated for technical and environmental reasons. The effects of CO<inf>2</inf> recirculation on the product distribution and energy consumption of the IBPGM process are examined. The production rate of methanol is improved with the increased CO<inf>2</inf> recycle fraction, while that of bio-oil does not change. The IBPGM is a highly exothermic process, with the largest energy-releasing unit being the methanol reactor. The energy consumption at the gasifier exhibits the same trend and thermal self-sufficiency is consequently achieved when the recycle fraction is raised to 0.76. Environmental assessment using a life cycle analysis tool reveals that the energy management of methanol synthesis unit and syngas processor needs to be improved as they highly contribute toward the carbon footprint and potential environmental impact. The technical and environmental factors of the IBPGM process are evaluated by the analysis hierarchy process, calculated by a multi-criteria decision analysis method. The IBPGM process with the CO<inf>2</inf> recycle fraction of 0.2 offers the best performance. Under this condition, the methanol and bio-oil production rates of 0.23 and 0.09 kmol h−1, respectively, and the energy efficiency of 60.7% can be achieved, based on the biomass feed rate of 1 kmol h−1.

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