Feedstock atomization effects on FCC riser reactors selectivity

Theologos, KN; Lygeros, AI; Markatos, NC

dc.contributor.author	Theologos, KN	en
dc.contributor.author	Lygeros, AI	en
dc.contributor.author	Markatos, NC	en
dc.date.accessioned	2014-03-01T01:14:40Z
dc.date.available	2014-03-01T01:14:40Z
dc.date.issued	1999	en
dc.identifier.issn	0009-2509	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13174
dc.subject	Catalytic Cracking	en
dc.subject	Critical Parameter	en
dc.subject	Droplet Size	en
dc.subject	Mixing Condition	en
dc.subject	Model Development	en
dc.subject	Parametric Study	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Atomization	en
dc.subject.other	Catalysts	en
dc.subject.other	Computational fluid dynamics	en
dc.subject.other	Computer simulation	en
dc.subject.other	Drop formation	en
dc.subject.other	Feedstocks	en
dc.subject.other	Fluid catalytic cracking	en
dc.subject.other	Mathematical models	en
dc.subject.other	Mixing	en
dc.subject.other	Residual fuels	en
dc.subject.other	Vaporization	en
dc.subject.other	Fluid catalytic cracking riser reactors	en
dc.subject.other	Chemical reactors	en
dc.subject.other	atomization	en
dc.subject.other	mixing	en
dc.subject.other	reactor	en
dc.subject.other	riser	en
dc.title	Feedstock atomization effects on FCC riser reactors selectivity	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0009-2509(99)00294-8	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0009-2509(99)00294-8	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	Feedstock atomization affects catalytic cracking reactions that take place in an FCC riser reactor, and is considered a critical parameter especially when processing heavy fuels. A finely atomized feed allows instantaneous flash vaporization and quick quenching of the catalyst, conditions that allow the feed components to be subjected to an ideal mixing temperature. Mixing conditions at the inlet of the riser reactor also affect cracking reactions selectivity. An atomization modeling scheme has been incorporated into a CFD model developed by Theologos and Markatos (1993, A.I.Ch.E. Journal, 39(6), 1001.) and Theologos, Nikou, Lygeros and Markatos (1997, A.I.Ch.E. Journal, 43(2), 486) and has been used to evaluate atomization effects on feedstock vaporization rates, cracking reactions initiation, reactor selectivity and overall reactor performance. Cracking reactions are simulated using a simplified 3-lump model. The atomization modeling scheme takes into account the initial feed droplet size at nozzle's exit, as well as droplet size reduction along with vaporization. Droplet vaporization parameters from the literature have been considered. To evaluate the degree of feedstock atomization effects on reactor performance, a parametric study is carried out considering three different initial feed droplet sizes, namely 30, 100, and 500 μm. The area where feedstock vaporization takes place inside the reactor is predicted and the evolution of atomized droplet size is illustrated. The effect of the initial degree of atomization on cracking reactions selectivity is discussed.Feedstock atomization affects catalytic cracking reactions that take place in an FCC riser reactor, and is considered a critical parameter especially when processing heavy fuels. A finely atomized feed allows instantaneous flash vaporization and quick quenching of the catalyst, conditions that allow the feed components to be subjected to an ideal mixing temperature. Mixing conditions at the inlet of the riser reactor also affect cracking reactions selectivity. An atomization modeling scheme has been incorporated into a CFD model developed by Theologos & Markatos and Theologos, Nikou, Lygeros & Markatos and has been used to evaluate atomization effects on feedstock vaporization rates, cracking reactions initiation, reactor selectivity and overall reactor performance. Cracking reactions are simulated using a simplified 3-lump model. The atomization modeling scheme takes into account the initial feed droplet size at nozzle's exit, as well as droplet size reduction along with vaporization. Droplet vaporization parameters from the literature have been considered. To evaluate the degree of feedstock atomization effects on reactor performance, a parametric study is carried out considering three different initial feed droplet sizes, namely 30, 100, and 500 μm. The area where feedstock vaporization takes place inside the reactor is predicted and the evolution of atomized droplet size is illustrated. The effect of the initial degree of atomization on cracking reactions selectivity is discussed.	en
heal.publisher	Elsevier Science Ltd, Exeter, United Kingdom	en
heal.journalName	Chemical Engineering Science	en
dc.identifier.doi	10.1016/S0009-2509(99)00294-8	en
dc.identifier.isi	ISI:000082287100027	en
dc.identifier.volume	54	en
dc.identifier.issue	22	en
dc.identifier.spage	5617	en
dc.identifier.epage	5625	en