Numerical investigation on the combustion behaviour of pre-dried Greek lignite

Agraniotis, M; Stamatis, D; Grammelis, P; Kakaras, E

dc.contributor.author	Agraniotis, M	en
dc.contributor.author	Stamatis, D	en
dc.contributor.author	Grammelis, P	en
dc.contributor.author	Kakaras, E	en
dc.date.accessioned	2014-03-01T01:31:24Z
dc.date.available	2014-03-01T01:31:24Z
dc.date.issued	2009	en
dc.identifier.issn	0016-2361	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19798
dc.subject	CFD modelling	en
dc.subject	Dry lignite	en
dc.subject	NOx emissions	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	CFD modelling	en
dc.subject.other	CFD simulations	en
dc.subject.other	Co-firing	en
dc.subject.other	Coal firing	en
dc.subject.other	Combustion simulations	en
dc.subject.other	Dry lignite	en
dc.subject.other	Efficiency increase	en
dc.subject.other	Experimental data	en
dc.subject.other	Experimental facilities	en
dc.subject.other	Experimental investigations	en
dc.subject.other	Fluidized bed drying	en
dc.subject.other	Industrial scale	en
dc.subject.other	Industrial tests	en
dc.subject.other	Internal heat	en
dc.subject.other	Large scale boilers	en
dc.subject.other	NOx emissions	en
dc.subject.other	Numerical investigations	en
dc.subject.other	Post processing	en
dc.subject.other	Slagging and fouling	en
dc.subject.other	State of the art	en
dc.subject.other	Temperature field	en
dc.subject.other	Validation with experimental data	en
dc.subject.other	Work Focus	en
dc.subject.other	Boiler firing	en
dc.subject.other	Coal combustion	en
dc.subject.other	Coal industry	en
dc.subject.other	Computational fluid dynamics	en
dc.subject.other	Dewatering	en
dc.subject.other	Drying	en
dc.subject.other	Flue gases	en
dc.subject.other	Fluidization	en
dc.subject.other	Fluidized bed combustion	en
dc.subject.other	Fluidized bed process	en
dc.subject.other	Fluidized beds	en
dc.subject.other	Gas plants	en
dc.subject.other	Heat exchangers	en
dc.subject.other	Heat transfer	en
dc.subject.other	Industrial emissions	en
dc.subject.other	Lignite	en
dc.subject.other	Smoke	en
dc.subject.other	Curing	en
dc.title	Numerical investigation on the combustion behaviour of pre-dried Greek lignite	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.fuel.2009.03.036	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.fuel.2009.03.036	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	Dry coal firing is expected to play an increasingly important role in future lignite power plants. The planned evolution from the conventional lignite drying concept with hot recirculated flue gas to the ""fluidized bed drying with internal heat utilization, WTA"", technology in the next generation of lignite power plants is estimated to bring an additional efficiency increase of 2-4% points compared to the today's state of the art. In this framework NTUA/LSB and CERTH/ISFTA has performed experimental investigations at a semi industrial scale 1 MWth facility on the characterization of Greek pre-dried lignite's combustion behaviour in terms of temperature fields, heat transfer, emissions, slagging and fouling tendency and residues quality. The present work focuses on the numerical investigation of Greek dry lignite combustion firstly by post-processing and evaluation of available experimental data and secondly by combustion simulations. Q-T plots describing the heat transfer in the experimental facility are derived and specific cases of the performed tests are simulated with a commercial CFD tool, in order to estimate flow, temperature fields, NOx emissions and compare with the available experimental data. A good agreement between simulated and experimental results will support the further work on large scale boiler simulations in raw and dry coal co-firing mode, where the possibility of validation with experimental data is limited. The obtained Q-T diagrams are used to evaluate the influence of co-firing on the heat transfer in the facility and to further extrapolate the conclusions of the performed semi industrial tests on the large scale. The overall results of the CFD simulations, including predictions of temperature and NOx profiles, are in good agreement with the available experimental data at the reference case, while at the dry coal co-firing cases succeed on reproducing the basic trends of the performed experiments. © 2009 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Fuel	en
dc.identifier.doi	10.1016/j.fuel.2009.03.036	en
dc.identifier.isi	ISI:000270641900009	en
dc.identifier.volume	88	en
dc.identifier.issue	12	en
dc.identifier.spage	2385	en
dc.identifier.epage	2391	en