High temperature solid oxide fuel cell integrated with novel allothermal biomass gasification - Part II: Exergy analysis

Panopoulos, KD; Fryda, L; Karl, J; Poulou, S; Kakaras, E

dc.contributor.author	Panopoulos, KD	en
dc.contributor.author	Fryda, L	en
dc.contributor.author	Karl, J	en
dc.contributor.author	Poulou, S	en
dc.contributor.author	Kakaras, E	en
dc.date.accessioned	2014-03-01T01:55:34Z
dc.date.available	2014-03-01T01:55:34Z
dc.date.issued	2006	en
dc.identifier.issn	0378-7753	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/27789
dc.subject	modelling	en
dc.subject	SOFC	en
dc.subject	biomass	en
dc.subject	gasification	en
dc.subject	Aspen Plus (TM)	en
dc.subject	exergy	en
dc.subject.classification	Electrochemistry	en
dc.subject.classification	Energy & Fuels	en
dc.subject.other	SOFC SYSTEMS	en
dc.subject.other	ENERGY	en
dc.title	High temperature solid oxide fuel cell integrated with novel allothermal biomass gasification - Part II: Exergy analysis	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	Biomass gasification derived gas is a renewable fuel, which can be used for SOFC applications. This work investigates the integration of a near atmospheric solid oxide fuel cell (SOFC) with a novel allothermal biomass steam gasification process into a combined heat and power (CHP) system of less than MW, range. Heat for steam gasification is supplied from SOFC depleted fuel in a fluidised bed (FB) combustor via high temperature sodium heat pipes. In the first paper, the integrated system was modelled in Aspen Plus (TM) and critical aspects for its feasibility were identified. The aim of this second part is the evaluation of the integrated system in exergy terms. Satisfying allothermal gasification heat demand is illustrated by examining each sub-process involved separately as well as combined. For a relatively low STBR = 0.6, the SOFC fuel utilisation for which the system operates under optimum conditions is U-f =0.7. Above that value additional biomass has to be used in the FB combustor to provide gasification heat with considerable exergy losses. For SOFC operation at current density 2500 A m(-2), the system uses 90 kg h(-1) biomass, operates with electrical exergetic efficiency 32% producing 140 kW(e), while the combined electrical and thermal exergetic efficiency is 35%. (c) 2005 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	JOURNAL OF POWER SOURCES	en
dc.identifier.isi	ISI:000241012000102	en
dc.identifier.volume	159	en
dc.identifier.issue	1	en
dc.identifier.spage	586	en
dc.identifier.epage	594	en