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Syngas as an Additional Energy Carrier in the Pulp and Paper Industry: A Mill-Wide System Analysis of a Combined Drying Concept, Utilizing On-Site Generated Gas and Steam
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper.ORCID-id: 0000-0002-9919-1040
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper.ORCID-id: 0000-0002-5864-4576
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper.ORCID-id: 0000-0002-5764-7062
2014 (Engelska)Ingår i: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 28, nr 9, s. 5841-5848Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Large amounts of thermal energy are required for different unit operations in the pulp and paper industry. Typically, this energy is distributed by means of steam. In this study, introduction of in-situ-generated syngas as an energy carrier in parallel to the predominant steam has been investigated. The examined systems use dual fluidized-bed gasification integrated with a solid fuel boiler of a paper mill together with impingement drying in combination with cylinder drying, a concept enabling higher specific drying rates. The studied systems exhibit reduced overall energy use when compared to the present situation with conventional steam-heated cylinder drying. Cold tar cleaning by condensation/absorption and firing of the syngas in a gas turbine followed by utilization of the exhaust gases for drying are interesting options because this results in reduced biomass consumption with maintained power production.

Ort, förlag, år, upplaga, sidor
Washington, DC, USA: American Chemical Society (ACS), 2014. Vol. 28, nr 9, s. 5841-5848
Nationell ämneskategori
Energisystem
Forskningsämne
Miljö- och energisystem
Identifikatorer
URN: urn:nbn:se:kau:diva-33956DOI: 10.1021/ef5010144ISI: 000342118200030OAI: oai:DiVA.org:kau-33956DiVA, id: diva2:752208
Forskningsfinansiär
KK-stiftelsenTillgänglig från: 2014-10-02 Skapad: 2014-10-02 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Ingår i avhandling
1. Added value from biomass by broader utilization of fuels and CHP plants
Öppna denna publikation i ny flik eller fönster >>Added value from biomass by broader utilization of fuels and CHP plants
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The present work, where additional value-creating processes in existing combined heat and power (CHP) structures have been examined, is motivated by a political- and consumer-driven strive towards a bioeconomy and a stagnation for the existing business models in large parts of the CHP sector.

The research is based on cases where the integration of flash pyrolysis for co-production of bio-oil, co-gasification for production of fuel gas and synthetic biofuels as well as leaching of extractable fuel components in existing CHP plants have been simulated. In particular, this work has focused on the CHP plants that utilize boilers of fluidized bed (FB) type, where the concept of coupling a separate FB reactor to the FB of the boiler forms an important basis for the analyses. In such dual fluidized bed (DFB) technology, heat is transferred from the boiler to the new rector that is operating with other fluidization media than air, thereby enabling other thermochemical processes than combustion to take place. The result of this work shows that broader operations at existing CHP plants have the potential to enable production of significant volumes of chemicals and/or fuels with high efficiency, while maintaining heat supply to external customers.

Based on the insight that the technical preconditions for a broader operation are favourable, the motivation and ability among the incumbents in the Swedish CHP sector to participate in a transition of their operation towards a biorefinery was examined. The result of this assessment showed that the incumbents believe that a broader operation can create significant values for their own operations, the society and the environment, but that they lack both a strong motivation as well as important abilities to move into the new technological fields.

If the concepts of broader production are widely implemented in the Swedish FB based CHP sector, this can substantially contribute in the transition towards a bioeconomy.

Abstract [en]

Bioeconomy has been identified to hold a great potential for reducing fossil fuel dependence and for maintaining and creating economic growth. Large parts of the combined heat and power (CHP) sector, which successfully have contributed in the transition towards a fossil free society, are at present facing stagnation. District heating actors are facing challenges due to warmer climate, better insulated buildings and competition from heat pumps. The forest industry where CHP plants supplies processes with heat is facing structural changes foremost in the graphic segments.

The emerging bioeconomy and the stagnation for the existing business models in large parts of the CHP sector form the background for the examination of additional value-creating processes in the existing CHP structure presented in this thesis. The technical viability for integration of fast pyrolysis, gasification and leaching with existing CHP plants has been analysed as well as the motivation and ability of the CHP incumbents to participate in a transition towards the bioeconomy by developing their plants to biorefineries. 

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstads universitet, 2016
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2016:44
Nyckelord
biofuels, bioeconomy, pyrolysis, gasification, leaching
Nationell ämneskategori
Energisystem
Forskningsämne
Miljö- och energisystem
Identifikatorer
urn:nbn:se:kau:diva-46906 (URN)978-91-7063-727-8 (ISBN)
Disputation
2016-12-08, 9C203 Nyquistsalen, 09:00 (Svenska)
Opponent
Handledare
Forskningsfinansiär
KK-stiftelsen
Tillgänglig från: 2016-11-21 Skapad: 2016-10-20 Senast uppdaterad: 2019-06-10Bibliografiskt granskad

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Gustavsson, ChristerNilsson, LarsRenström, Roger

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Institutionen för ingenjörs- och kemivetenskaper
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Energy & Fuels
Energisystem

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