The effect of pressure on coal char combustion

Liakos, HH; Theologos, KN; Boudouvis, AG; Markatos, NC

dc.contributor.author	Liakos, HH	en
dc.contributor.author	Theologos, KN	en
dc.contributor.author	Boudouvis, AG	en
dc.contributor.author	Markatos, NC	en
dc.date.accessioned	2014-03-01T01:17:14Z
dc.date.available	2014-03-01T01:17:14Z
dc.date.issued	2001	en
dc.identifier.issn	1359-4311	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14409
dc.subject	Chemical reaction kinetics	en
dc.subject	Diffusion	en
dc.subject	Pressurized char combustion	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Air	en
dc.subject.other	Diffusion in solids	en
dc.subject.other	Finite volume method	en
dc.subject.other	Fluidized beds	en
dc.subject.other	Heat radiation	en
dc.subject.other	High pressure effects in solids	en
dc.subject.other	Mass transfer	en
dc.subject.other	Mathematical models	en
dc.subject.other	Partial differential equations	en
dc.subject.other	Pressurization	en
dc.subject.other	Reaction kinetics	en
dc.subject.other	Turbulent flow	en
dc.subject.other	Coal char	en
dc.subject.other	Coal combustion	en
dc.title	The effect of pressure on coal char combustion	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S1359-4311(00)00100-9	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S1359-4311(00)00100-9	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	A two-dimensional, two-phase combustion model of pulverized coal char at elevated pressures is presented in this paper. This is often encountered in furnaces used for power generation, industrial heating and steam production, and for conversion of solids to gas and liquid products. In pressurized circulating fluidized bed boilers, the effect of pressure on char combustion is significant. Of particular importance is to reveal the relative significance of the diffusion and chemical reaction, as controlling mechanisms, and to evaluate the effect of total pressure on the performance of the combustion chamber. The partial differential equations of conservation of mass, momentum and energy are solved taking into consideration turbulent flow, interphase mass- and heat-transfer, radiation and varying operational conditions (e.g. feed of coal and primary and secondary air). The equations are integrated with the finite volume method and are solved for the flow field, temperature field in the gaseous and solid phases and the concentration of reactants and products. The results show that both chemical reaction and diffusion mechanisms control the combustion at elevated pressure. Moreover? the effect of pressure on the reaction kinetics proves to be significant. (C) 2001 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Applied Thermal Engineering	en
dc.identifier.doi	10.1016/S1359-4311(00)00100-9	en
dc.identifier.isi	ISI:000168177400002	en
dc.identifier.volume	21	en
dc.identifier.issue	9	en
dc.identifier.spage	917	en
dc.identifier.epage	928	en