An RTD study for the flow of lignite particles through a pilot rotary dryer. Part II: Flighted drum case

Hatzilyberis, KS; Androutsopoulos, GP

dc.contributor.author	Hatzilyberis, KS	en
dc.contributor.author	Androutsopoulos, GP	en
dc.date.accessioned	2014-03-01T01:14:24Z
dc.date.available	2014-03-01T01:14:24Z
dc.date.issued	1999	en
dc.identifier.issn	0737-3937	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13048
dc.subject	Allothermal gasification plant	en
dc.subject	Particle size segregation	en
dc.subject	Residence time	en
dc.subject	Rotary kiln	en
dc.subject	Rotating drum	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	Dryers (equipment)	en
dc.subject.other	Flow of solids	en
dc.subject.other	Gasification	en
dc.subject.other	Industrial plants	en
dc.subject.other	Lignite	en
dc.subject.other	Particles (particulate matter)	en
dc.subject.other	Phase separation	en
dc.subject.other	Rotary kilns	en
dc.subject.other	Rotational flow	en
dc.subject.other	Allothermal gasification plant	en
dc.subject.other	Flighted drum case	en
dc.subject.other	Particle size segregation	en
dc.subject.other	Residence time distribution	en
dc.subject.other	Rotating drum	en
dc.subject.other	Tracer pulse input response experiments	en
dc.subject.other	Mass transfer	en
dc.subject.other	dryer	en
dc.subject.other	flow	en
dc.subject.other	gasification	en
dc.subject.other	lignite processing	en
dc.subject.other	particle size analysis	en
dc.subject.other	residence time	en
dc.title	An RTD study for the flow of lignite particles through a pilot rotary dryer. Part II: Flighted drum case	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/07373939908917568	en
heal.identifier.secondary	http://dx.doi.org/10.1080/07373939908917568	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	In Part II of this work a flighted pilot rotating cylindrical drum, intended to be used as either a dryer or calciner (kiln), has been used to investigate the flow, through it, of pulverized moist lignite. Tracer pulse input - response experiments have been performed. Residence Time Distribution (RTD) data have been deduced for three types of flight geometry, namely: Rectangular (RA), Equal Angular Distribution (E.A.D.) and Equal Horizontal Distribution (E.H.D.). For each flight shape, mean residence time t̄ has been correlated with drum operating conditions. The sequence t̄(EAD) < t̄(RA) < t̄(EHD) has been validated. A comparison between the residence time predictions for the flighted and the bare drum has indicated that t̄ for the former may be higher by up to 3.5 times than that for the latter. Exceptionally high solids hold-up values (i.e., Z = 0.13 - 0.42) have been observed and compared to theoretical predictions. Particle size segregation during lignite flow through the flighted drum was not confirmed.In Part II of this work a flighted pilot rotating cylindrical drum, intended to be used as either a dryer of calciner (kiln), has been used to investigate the flow, through it, of pulverized moist lignite. Tracer pulse input - response experiments have been performed. Residence Time Distribution (RTD) data have been deduced for three types of flight geometry, namely: Rectangular (RA), Equal Angular Distribution (E.A.D.) and Equal Horizontal Distribution (E.H.D.). For each flight shape, mean residence time t̄ has been correlated with drum operating conditions. The sequence t̄EAD < t̄RA < t̄EHD has been validated. A comparison between the residence time predictions for the flighted and the bare drum has indicated that t̄ for the former may be higher by up to 3.5 times than that for the latter. Exceptionally high solids hold-up values (i.e., 2 = 0.13 - 0.42) have been observed and compared to theoretical predictions. Particle size segregation during lignite flow through the flighted drum was not confirmed.	en
heal.publisher	Marcel Dekker Inc, New York, NY, United States	en
heal.journalName	Drying Technology	en
dc.identifier.doi	10.1080/07373939908917568	en
dc.identifier.isi	ISI:000080188000007	en
dc.identifier.volume	17	en
dc.identifier.issue	4-5	en
dc.identifier.spage	759	en
dc.identifier.epage	774	en