Lythcke-Jørgensen, Christoffer Ernst

Denne afhandling fokuserer på fleksible multigenerationssystemer, som er dynamiske og integrerede energikonverteringsanlæg kendetegnet ved deres evne til at indpasse driften i forhold til variationer i eksterne driftsforhold. Hypotesen er at disse anlæg kan bidrage til omkostningseffektiv balancering af fluktuerende produktion fra vedvarende energikilder ved at sammenkoble de forskellige energisektorer med lokale energidistributionssystemer. En central udfordring i udviklingen af fleksible multigenerationssystemer er den manglende kobling mellem procesdesign, hvori variationer og dynamik i det overordnede energisystem simplificeres, og energisystemsanalyse, hvori procesintegrations-synergi ikke overvejes. Det overordnede formål med denne afhandling er at udvikle en metode der sammentænker procesdesign med energisystemsanalyse for derigennem at kunne udføre en sammenhængende og holistisk designoptimering af fleksible multigenerationssystemer. I afhandlingen præsenteres en metode til designoptimering af fleksible multigenerations-systemer der forholder sig til: Valg, dimensionering, placering og integration af processer; driftsoptimering i forhold til både timevise variationer i eksterne driftsforhold samt i forhold til den langsigtede udvikling i energisystemet; biomasse-forsyningskæder og tilgængelighed af lokale ressourcer; kombineret med global følsomheds- og usikkerheds-analyse. Metoden inkluder en nyudviklet teknik til at aggregere data for eksterne driftsforhold, kaldet CHOP metoden. Derudover præsenteres tre cases der behandler integration af biomasseforarbejdning og anden energikonverteringsteknologi i eksisterende danske kraftvarmeværker ved brug af den udviklede metode. Resultaterne indikerer at den udviklede designmetode er effektiv til at identificere lovende designs blandt mange muligheder. Derudover understreger case-resultaterne vigtigheden af at man i designoptimering forholder sig systematisk til variationer i eksterne driftsforhold, procesintegration samt usikkerhedsanalyse. Det foreslås at videre forskning undersøger mulige energisystemeffekter fra fleksible multigenerationssystemer, samt udvikling af designoptimeringsmetoden så den kan forholde sig til lagre. Søgeord: Biomasseforarbejdning, designoptimering, driftsoptimering, energikonvertering, fleksible multigenerationssystemer, polygeneration, procesintegration, smart energi.This thesis focuses on the design of flexible multi-generation systems, which are dynamic and integrated energy conversion systems characterized by the ability to adjust operation in response to fluctuating operating conditions. It is the hypothesis that these systems may support the balancing of variable renewable energy sources in a cost-effective way by linking the different sectors in the energy system with local energy supply systems. A key challenge faced in the development of flexible multi-generation system is the knowledge gap between process design practices, which simplify energy system variations and dynamics, and energy system analysis, which fails to consider process integration synergies in local systems. The primary objective of the thesis is to derive a methodology for linking process design practices with energy system analysis for enabling coherent and holistic design optimization of flexible multi-generation systems. A methodology is presented for optimizing the design of flexible multi-generation systems which considers: Selection, dimensioning, location and integration of processes; operation optimization with respect to both hourly variations in operating conditions as well as long term energy system development; biomass supply chains and local resource availability; combined with global sensitivity and uncertainty analysis. The methodology includes a novel method for aggregating external operating condition datasets, named the CHOP method. In addition, three case studies focusing on integrating biomass processing and energy conversion technologies in existing combined heat and power plants in Denmark are conducted using the developed methods. The outcomes of this thesis indicate that the developed design methodology is efficient in screening for promising designs of flexible multi-generation system. In addition, the case study results emphasize the importance of considering flexible operation, systematic process integration, and systematic assessment of uncertainties in the design optimization. It is recommended that future research focus on assessing system impacts from flexible multi-generation systems and performance improvements from storage options

Online Research Database In Technology

Design and optimization of flexible multi-generation systems

http://orbit.dtu.dk/ws/files/130571666/S218_Christoffer_Ernst_Lytcke_J_rgensen.pdf

Design and optimization of flexible multi-generation systems

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Online Research Database In Technology