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The impact of lignocellulosic ethanol yields in polygeneration with district heating: A case study
Mälardalen University, School of Sustainable Development of Society and Technology. (MERO)
Mälardalen University, School of Sustainable Development of Society and Technology.
Mälardalen University, School of Sustainable Development of Society and Technology.ORCID iD: 0000-0003-0300-0762
Mälardalen University, School of Sustainable Development of Society and Technology.ORCID iD: 0000-0002-3485-5440
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2012 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 92, 791-799 p.Article in journal (Refereed) Published
Abstract [en]

The development towards high energy efficiency and low environmental impact from human interactions

has led to changes at many levels of society. As a result of the introduction of penalties on carbon

dioxide emissions and other economic instruments, the energy industry is striving to improve energy

efficiency and climate mitigation by switching from fossil fuels to renewable fuels. Biomass-based combined

heat and power (CHP) plants connected to district heating networks have a need to find uses for the

excess heat they produce in summer when the heat demand is low. On the other hand, the transport sector

makes a substantial contribution to the increasing CO

2

emissions, which have to be reduced. One

promising alternative to address these challenging issues is the integration of vehicle fuel production

with biomass-based CHP plants. This paper presents the configuration and operating profits in terms

of electricity, heat and ethanol fuel from cellulosic biomass. A case study of a commercial small scale

CHP plant was conducted using simulation and modeling tools. The results clearly show that electricity

production can be increased when CHP production is integrated with cellulosic ethanol production. The

findings also show that the economic benefits of the energy system can be realized with near-term commercially

available technology, and that the benefits do not rely solely on ethanol yields.

Place, publisher, year, edition, pages
2012. Vol. 92, 791-799 p.
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-13297DOI: 10.1016/j.apenergy.2011.08.031ISI: 000300463800085Scopus ID: 2-s2.0-84855257802OAI: oai:DiVA.org:mdh-13297DiVA: diva2:457315
Available from: 2011-11-17 Created: 2011-11-17 Last updated: 2015-07-06Bibliographically approved
In thesis
1. From Combined Heat and Power to Polygeneration
Open this publication in new window or tab >>From Combined Heat and Power to Polygeneration
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In order to reach targets on reducing greenhouse gas emissions from fossil resources it is necessary to reduce energy losses in production processes. In polygeneration, several processes are combined to complement each other to avoid sub-optimization of the standalone processes. This thesis addresses polygeneration with focus on Combined Heat and Power (CHP) production integrated with other processes. Biomass-fired CHP plants are commonly dimensioned to have surplus heat production capacity during periods with lower heat demand. At the same time, production of biomass based vehicle fuels and fuel upgrading are heat demanding processes. The opportunity to combine CHP with ethanol production from lignocellulosic feedstock and torrefaction with the aim of replacing fossil fuels are used as cases during the evaluation of polygeneration. Simulation models are used to investigate the performance of CHP integrated with production of ethanol and torrefaction. Measured data from commercial CHP plants have been used to reflect the operation boundaries. The findings show that polygeneration can compete with stand-alone production in both energy and economic performance. Polygeneration offers a wider operating range where reduced minimum load gives increased annual operating time. Therefore, under limited heat demand more renewable electricity production is possible due to increased operating hours and steam extraction from the turbine during part-load operation. Resource availability and fluctuations in fuel price have the largest impact on the profit of polygeneration. Other aspects that have substantial effects on the economy in polygeneration are the electricity spot price and subsidies. Furthermore, it has been proven that the yield of each product in a multiproduct process plant, the size of the plant and the heat demand have a large impact on the economy. Polygeneration turns by-products into buy-products.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2015
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 181
National Category
Mechanical Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-28442 (URN)978-91-7485-221-9 (ISBN)
Public defence
2015-09-02, Paros, Mälardalens högskola, Västerås, 13:15 (English)
Opponent
Supervisors
Available from: 2015-07-06 Created: 2015-06-23 Last updated: 2015-08-24Bibliographically approved

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Starfelt, FredrikDaianova, LiliaYan, JinyueThorin, EvaDotzauer, Erik
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