Aspects of Ash Transformations in Pressurised Entrained-Flow Gasification of Woody Biomass: Pilot-scale studies

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Ma, CharlieLuleå tekniska universitet,Energivetenskap,Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå, Sweden (författare)

Aspects of Ash Transformations in Pressurised Entrained-Flow Gasification of Woody Biomass : Pilot-scale studies

BokEngelska2017

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Luleå :Luleå tekniska universitet,2017
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:ltu-62914
ISBN:9789175838748
ISBN:9789175838755
https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62914URI
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-159449URI

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Språk:engelska
Sammanfattning på:engelska

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Doctoral thesis / Luleå University of Technology,1402-1544

Anmärkningar

Pressurised entrained-flow gasification (PEFG) of woody biomass has the potential to produce high purity syngas for the production of vital chemicals, e.g., biofuels. However, ash-related issues such as reactor blockages and refractory corrosion need to be addressed before this potential can be realised from a technical perspective. These undesirable consequences can be brought about by slag formation involving inorganic ash-forming elements and the chemical transformations that they undergo during fuel conversion. The objective of this study was to elucidate the ash transformations of the major ash-forming elements and the slag formation process. A pilot-scale PEFG reactor was used as the basis of the study, gasifying different woody biomass-based fuels including wood, bark, and a bark/peat mixture. Different ash fractions were collected and chemically analysed. Reactor slags had elemental distributions differing from that of the fuel ash, indicating the occurrence of fractionation of ash material during fuel conversion. Fly ash particles from a bark campaign were also heterogeneous with particles exhibiting differing compositions and physical properties; e.g., molten and crystalline formations. Si was consistently enriched in the reactor slags compared to other major ash-forming elements, while analyses of other ash fractions indicated that K was likely volatilised to a significant extent. In terms of slag behaviour, near-wall temperatures of approximately 1050-1200 °C inside the reactor were insufficient to form flowing ash slag for continuous extraction of ash material during firing the woody biomass fuels alone. However, fuel blending of a bark fuel with a silica-rich peat changed the chemical composition of the reactor slags and bulk slag flow behaviour was evident. Thermochemical equilibrium calculations supported the importance of Si in melt formation and in lowering solidus and liquidus temperatures of Ca-rich slag compositions that are typical from clean wood and bark. Viscosity estimations also showed the impact that solids have upon slag flow behaviour and corresponded qualitatively to the experimental observations. Corrosion of reactor refractory was observed. The mullite-based refractory of the reactor formed a slag with the fuel ash slag, which caused the former to flux away. Reactor blockages were also resultant because of the high viscosity of this slag near the outlet. A preliminary study into the corrosion of different refractories was also carried out, based on firing a bark/peat mixture. Alumina-rich refractories consisting of corundum, hibonite, mullite, and andalusite tended to form anorthite and exhibited varying degrees of degradation. Infiltration of slag was evident for all the samples and was a severe mode of degradation for some refractories. For fused-cast periclase and spinel-based refractories, slag infiltration was limited to voids and no extensive signs of refractory dissolution were found. This is also supported by a thermochemical equilibrium calculations mimicking slag infiltration that incorporated viscosity estimations. The findings from this thesis contribute towards the development of woody biomass PEFG by highlighting issues concerning ash fractionation, slag behaviours and ash\slash refractory interaction that should be investigated further.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Industriell bioteknik Bioenergi hsv//swe
ENGINEERING AND TECHNOLOGY Industrial Biotechnology Bioenergy hsv//eng
NATURVETENSKAP Kemi Oorganisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Inorganic Chemistry hsv//eng
TEKNIK OCH TEKNOLOGIER Kemiteknik Kemiska processer hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Chemical Process Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
woody biomass
gasification
ash transformation
slag behaviour
refractory corrosion
Energiteknik
Energy Engineering

Biuppslag (personer, institutioner, konferenser, titlar ...)

Öhman, Marcus,ProfessorLuleå tekniska universitet,Energivetenskap (preses)
Luleå tekniska universitetEnergivetenskap (creator_code:org_t)

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Av författaren/redakt...: Ma, Charlie; Öhman, Marcus, P ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Industriell biot ...; och Bioenergi

NATURVETENSKAP: NATURVETENSKAP; och Kemi; och Oorganisk kemi

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik; och Kemiska processe ...

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Energiteknik

Delar i serien: Doctoral thesis ...

Av lärosätet: Luleå tekniska universitet; Umeå universitet

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