Biomass Conversion to Methanol Integrating Solid Oxide Cells and Two-Stage Gasifier: Effects of Carbon Dioxide Recirculation and Pressurized Operation

Giacomo Butera*, Søren Højgaard Jensen, Rasmus Østergaard Gadsbøll, Jesper Ahrenfeldt, Lasse Røngaard Clausen

*Corresponding author for this work

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Abstract

Synthesis of biofuels is an important step in the phase out of fossil fuels in the transportation sector, especially in long-distance sea, air and road transport where direct electrification seems unfeasible. Integration of renewable electricity enables efficient electricity storage as well as an increased utilization of the biomass carbon, which lowers the biomass demand. This paper presents a flexible system for the conversion of biomass and electricity to methanol. The system is based on the deep integration of a Two-Stage gasifier and solid oxide cells (SOC). The integration enables efficient production of a nitrogen-free high-quality syngas, suitable for methanol production. This study focuses on the system in electrolysis mode, and analyzes the effects of recirculating CO2 from the gas conditioning and methanol synthesis process back to the SOC, as well as the effects of pressurized operation of the gasifier and increased H2O content in the gasifier. Thermodynamic modeling shows that CO2-recirculation allows an increase in conversion of the carbon in the biomass to methanol from 80 % up to 92 %, with an energy efficiency of 71 %. Only a slight pressurization seems feasible, as an increase in pressure beyond ~3 bar results in significant methane formation inside the SOC.
Original languageEnglish
Book seriesChemical engineering transactions
Volume76
ISSN1974-9791
DOIs
Publication statusPublished - 2019

Cite this

@article{9ec810e475564da58a1524703bdb6316,
title = "Biomass Conversion to Methanol Integrating Solid Oxide Cells and Two-Stage Gasifier: Effects of Carbon Dioxide Recirculation and Pressurized Operation",
abstract = "Synthesis of biofuels is an important step in the phase out of fossil fuels in the transportation sector, especially in long-distance sea, air and road transport where direct electrification seems unfeasible. Integration of renewable electricity enables efficient electricity storage as well as an increased utilization of the biomass carbon, which lowers the biomass demand. This paper presents a flexible system for the conversion of biomass and electricity to methanol. The system is based on the deep integration of a Two-Stage gasifier and solid oxide cells (SOC). The integration enables efficient production of a nitrogen-free high-quality syngas, suitable for methanol production. This study focuses on the system in electrolysis mode, and analyzes the effects of recirculating CO2 from the gas conditioning and methanol synthesis process back to the SOC, as well as the effects of pressurized operation of the gasifier and increased H2O content in the gasifier. Thermodynamic modeling shows that CO2-recirculation allows an increase in conversion of the carbon in the biomass to methanol from 80 {\%} up to 92 {\%}, with an energy efficiency of 71 {\%}. Only a slight pressurization seems feasible, as an increase in pressure beyond ~3 bar results in significant methane formation inside the SOC.",
author = "Giacomo Butera and Jensen, {S{\o}ren H{\o}jgaard} and Gadsb{\o}ll, {Rasmus {\O}stergaard} and Jesper Ahrenfeldt and Clausen, {Lasse R{\o}ngaard}",
year = "2019",
doi = "10.3303/CET1976197",
language = "English",
volume = "76",
journal = "Chemical engineering transactions",
issn = "1974-9791",
publisher = "AIDIC",

}

TY - JOUR

T1 - Biomass Conversion to Methanol Integrating Solid Oxide Cells and Two-Stage Gasifier: Effects of Carbon Dioxide Recirculation and Pressurized Operation

AU - Butera, Giacomo

AU - Jensen, Søren Højgaard

AU - Gadsbøll, Rasmus Østergaard

AU - Ahrenfeldt, Jesper

AU - Clausen, Lasse Røngaard

PY - 2019

Y1 - 2019

N2 - Synthesis of biofuels is an important step in the phase out of fossil fuels in the transportation sector, especially in long-distance sea, air and road transport where direct electrification seems unfeasible. Integration of renewable electricity enables efficient electricity storage as well as an increased utilization of the biomass carbon, which lowers the biomass demand. This paper presents a flexible system for the conversion of biomass and electricity to methanol. The system is based on the deep integration of a Two-Stage gasifier and solid oxide cells (SOC). The integration enables efficient production of a nitrogen-free high-quality syngas, suitable for methanol production. This study focuses on the system in electrolysis mode, and analyzes the effects of recirculating CO2 from the gas conditioning and methanol synthesis process back to the SOC, as well as the effects of pressurized operation of the gasifier and increased H2O content in the gasifier. Thermodynamic modeling shows that CO2-recirculation allows an increase in conversion of the carbon in the biomass to methanol from 80 % up to 92 %, with an energy efficiency of 71 %. Only a slight pressurization seems feasible, as an increase in pressure beyond ~3 bar results in significant methane formation inside the SOC.

AB - Synthesis of biofuels is an important step in the phase out of fossil fuels in the transportation sector, especially in long-distance sea, air and road transport where direct electrification seems unfeasible. Integration of renewable electricity enables efficient electricity storage as well as an increased utilization of the biomass carbon, which lowers the biomass demand. This paper presents a flexible system for the conversion of biomass and electricity to methanol. The system is based on the deep integration of a Two-Stage gasifier and solid oxide cells (SOC). The integration enables efficient production of a nitrogen-free high-quality syngas, suitable for methanol production. This study focuses on the system in electrolysis mode, and analyzes the effects of recirculating CO2 from the gas conditioning and methanol synthesis process back to the SOC, as well as the effects of pressurized operation of the gasifier and increased H2O content in the gasifier. Thermodynamic modeling shows that CO2-recirculation allows an increase in conversion of the carbon in the biomass to methanol from 80 % up to 92 %, with an energy efficiency of 71 %. Only a slight pressurization seems feasible, as an increase in pressure beyond ~3 bar results in significant methane formation inside the SOC.

U2 - 10.3303/CET1976197

DO - 10.3303/CET1976197

M3 - Journal article

VL - 76

JO - Chemical engineering transactions

JF - Chemical engineering transactions

SN - 1974-9791

ER -