Dynamic simulation and control of conveyor-belt dryers

Kiranoudis, CT; Maroulis, ZB; Marinos-Kouris, D

dc.contributor.author	Kiranoudis, CT	en
dc.contributor.author	Maroulis, ZB	en
dc.contributor.author	Marinos-Kouris, D	en
dc.date.accessioned	2014-03-01T01:09:51Z
dc.date.available	2014-03-01T01:09:51Z
dc.date.issued	1994	en
dc.identifier.issn	0737-3937	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11214
dc.subject	Dynamic Simulation	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	Atmospheric humidity	en
dc.subject.other	Belt conveyors	en
dc.subject.other	Control	en
dc.subject.other	Cooling	en
dc.subject.other	Drying	en
dc.subject.other	Dynamics	en
dc.subject.other	Heat transfer	en
dc.subject.other	Mass transfer	en
dc.subject.other	Mathematical models	en
dc.subject.other	Simulators	en
dc.subject.other	Temperature control	en
dc.subject.other	Thermal effects	en
dc.subject.other	Conveyor belt dryer	en
dc.subject.other	Digital simulation	en
dc.subject.other	Drying air humidity	en
dc.subject.other	Drying air temperature	en
dc.subject.other	Drying chamber	en
dc.subject.other	Dynamic simulation	en
dc.subject.other	Moisture content	en
dc.subject.other	Dryers (equipment)	en
dc.title	Dynamic simulation and control of conveyor-belt dryers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/07373939408962188	en
heal.identifier.secondary	http://dx.doi.org/10.1080/07373939408962188	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	The dynamic behavior of conveyor-belt dryers involving externally controlled heat and mass transfer phenomena has been studied via digital simulation. The investigation concerned an industrial dryer used for the moisture removal from wet raisins. The dryer consisted of three drying chambers and a cooling section, all involving the same conveyor belt. For each chamber, perfect temperature control was assumed for the drying air temperature, while its humidity was left uncontrolled. The effect of material temperature and moisture content at the entrance of the dryer and the drying air temperature on material temperature and moisture content at the exit of the dryer and the corresponding drying air humidity, have been explored by step forcing the disturbance and manipulated variables in the non-linear dryer model simulator. Results showed that material moisture content at the exit of the dryer is greatly affected by material moisture content at the entrance as well as by the drying air temperature. Reliable transfer functions for each process module were obtained by fitting several transfer function models on the simulated data using a least-squares approach. It was found that when input material moisture content could be instantly measured, the system responded slowly enough so that excellent control could be achieved for material moisture content at the exit of each chamber. In this case a PI-feedback cascade temperature controller was used. When a 15 sec delay measuring sensor was introduced, poor performance was observed. A simplified lead-lag feedforward controller, added to the system, in conjunction with the primary PI-feedback cascade controller, resulted in good control performance of the delay sensor system.	en
heal.publisher	Marcel Dekker Inc, New York, NY, United States	en
heal.journalName	Drying Technology	en
dc.identifier.doi	10.1080/07373939408962188	en
dc.identifier.isi	ISI:A1994PG40000004	en
dc.identifier.volume	12	en
dc.identifier.issue	7	en
dc.identifier.spage	1575	en
dc.identifier.epage	1603	en