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1D finite volume scheme for simulating gas-solid reactions in a porous spherical particle
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik.ORCID-id: 0000-0002-1881-2686
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik.
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik, Energiprocesser.ORCID-id: 0000-0001-7995-3151
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nationell ämneskategori
Kemiska processer
Identifikatorer
URN: urn:nbn:se:kth:diva-263084OAI: oai:DiVA.org:kth-263084DiVA, id: diva2:1366402
Anmärkning

QC 20191104

Tillgänglig från: 2019-10-29 Skapad: 2019-10-29 Senast uppdaterad: 2019-11-06Bibliografiskt granskad
Ingår i avhandling
1. Modeling in Biomass Harvesting, Biomass Pyrolysis and Producer Gas Cleaning
Öppna denna publikation i ny flik eller fönster >>Modeling in Biomass Harvesting, Biomass Pyrolysis and Producer Gas Cleaning
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Biomass is a viable alternative in order to mitigate the environmental effectscaused by the aggressive use of fossil feedstock during the last century.This thesis builds around the idea of a biofuel production process that iscomprised of biomass production, biomass gasication, gas cleaning andfuel production. Biomass production includes microalgae synthesis followedby harvesting to supply microalgae to the gasication process. In the gasi-cation process, the prepared microalgae is dried, pyrolyzed and gasiedto obtain a producer gas containing syngas and impurities. The producergas is cleaned from the impurities and fed to a fuel production unit, e.g. amethanation process.This thesis investigates three distinct aspects related to this processscheme, namely the occulation of microalgae as part of harvesting, biomasspyrolysis as a part of gasication, and sulfur removal from the producer gasas a part of gas cleaning.The investigation of occulation focuses on secondary phenomena thataccompany the aggregation and breakup of the suspended particles, namelyrestructuring, decay of oc strength and settling. For the study of theconsidered phenomena, a population balance model is developed.Slow pyrolysis of biomass is studied on both the reactor scale and thepellet scale. A model for a rotary drum reactor, using principles of isoconversionalanalysis, is developed for the study of dierent biomass feedstock.The proposed model allows for deriving a preliminary reactor design withminimal experimental input data. A one-dimensional nite volume schemeis developed for the investigation of pyrolysis on the pellet scale. The proposedscheme accounts for convective and diusive heat and mass transfer,and is tested against analytical solutions and commercial software packages.Sulfur removal by metal oxides in a packed bed is studied on both thesystem level and the process level. Criteria for the selection of metal oxidesand the design of packed bed units are derived. A detailed analysis isundertaken to study the reaction of H2S with ZnO in a packed bed, wherethe nano-particles of ZnO experience void formation and outward growth.

Ort, förlag, år, upplaga, sidor
KTH Royal Institute of Technology, 2019. s. 80
Serie
TRITA-CBH-FOU ; 2019:65
Nyckelord
PBE modeling of flocculation; Pyrolysis in Rotary Kilns; Pellet Pyrolysis; Gas Cleaning; Desulfurization.
Nationell ämneskategori
Kemiska processer
Identifikatorer
urn:nbn:se:kth:diva-263085 (URN)978-91-7873-367-5 (ISBN)
Disputation
2019-11-28, Kollegiesalen, Brinellv. 8, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 2019-10-29

Tillgänglig från: 2019-10-29 Skapad: 2019-10-29 Senast uppdaterad: 2019-11-06Bibliografiskt granskad
2.
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Sadegh-Vaziri, RamiarWinberg-Wang, HelenBäbler, Matthäus

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Sadegh-Vaziri, RamiarWinberg-Wang, HelenBäbler, Matthäus
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