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Modelling of Biomass Pyrolysis with Ex-situ Catalytic Upgrading for Bio-crude Production
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

This study presents a techno-economic assessment of slow pyrolysis of pine sawdust continued by ex-situ catalytic upgrading. The overall process consists of six sections: feed drying, pyrolysis, vapor filtration, ex-situ catalytic upgrading, vapor quenching, and combustion of permanent gas. In the process simulation, biomass is objected to slow pyrolysis at 450ºC in an electrically-heated screw reactor and pyrolysis vapors is upgraded in fixed catalytic bed reactor at 425 ºC (using HZSM-5). The model is then used to investigate effects of feed moisture variation and type of heating source in pyrolysis unit, i.e. thermal vs. electrical heating, to oil energy efficiency. According to the simulation model, the endothermic pyrolysis step requires1.46 MJ/kg dry-feed. On the other hand, ex-situ upgrading is slightly exothermic and releases50kJ/kg dry-feed. Overall, the conversion of biomass to bio-oil demonstrates a mass efficiency of 19.65%wt and an energy efficiency of 29.10%. The energy efficiency raises to 32.81% if a direct thermal source is applied instead of electrical heating. The bio-oil energy efficiency increases by 1.38% if the moisture content of the biomass decreases by 10%wt. In average,bio-oil and char production in ex-situ catalytic upgrading generate profit 1.47 SEK/kg dry feed. The uncertainty of bio-oil price causes the highest profit variation.

Place, publisher, year, edition, pages
2018. , p. 53
Keywords [en]
ex-situ catalytic upgrading, slow pyrolysis, screw reactor, fixed bed catalytic reactor, process design
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-231489OAI: oai:DiVA.org:kth-231489DiVA, id: diva2:1228811
Subject / course
Energy and Furnace Technology
Educational program
Master of Science - Innovative Sustainable Energy Engineering
Presentation
2018-06-18, Sefstrom, 14:00 (English)
Supervisors
Examiners
Available from: 2018-06-29 Created: 2018-06-28 Last updated: 2018-06-29Bibliographically approved

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