Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Drying of Porous Particles containing Liquid Mixtures in a Continuous Vibrated Fluid Bed Dryer
KTH, School of Chemical Science and Engineering (CHE).
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Torkning av porösa partiklar innehållandevätskeblandningar i en vibrerande fluidbäddtork (Swedish)
Abstract [en]

The influence of operation parameters on the drying of spherical porous particles containing a mixture of solvents evaporating into nitrogen in a continuously worked vibrated fluid-bed dryer was studied. A simulation based on the analytical solution to heat and mass transfer equations was applied and modifications were suggested.

 

Four different ternary liquid mixtures were selected: Acetone-Chloroform-Methanol (ACM), Ethanol-

2-propanol-Water (EIpW), Water-Ethanol-Ethyl Acetate (WEEa) and Ethanol-Methylethylketone- Toluene (EMekT). For the solid, physical properties of Pyrex was used.

 

Comparison of composition- and temperature- profiles indicated that there is no resistance against heat transfer within the solid and that the heat transfer is much faster than mass transfer.

 

Selectivity diagrams were drawn. The results indicated that selectivity is an important parameter in predicting the drying behavior.

 

The retention ratio was studied as performance parameter. Its variation was studied in response to changes in operation parameters, including gas velocity and temperature, as well as solid temperature and particle size.

 

A  modification  to  the  model  was  examined  by  assuming  a  liquid-content-dependent  diffusion resistance factor. It was observed that implementing such an assumption yields decreased values for retention ratios.

 

The  effect  of  vibration  on  heat  and  mass  transfer  coefficients  was  included  using  a  correlation suggested by Sbrodov and the resulting effect on retention ratio was examined.

 

Abstract [sv]

Inverkan   av   driftparameter  på  torkning  av   sfäriska  porösa  partiklar  som   innehåller lösningsmedelblandningar som avdunstar i kväve i en kontinuerligt viberande fluidbädd-tork studerades.  En  simuleringsmodell  baserad  på  den  analytiska  lösningen  till  värme-  och materieöverföringsekvationerna användes och ändringar föreslogs.

 

Fyra  olika  tärnar  vätskeblandningar  valdes:  aceton-kloroform-metanol(ACM),  etanol-2- propanolvatten,(EIpW),     vatten-etanol-etylacetat     (WEEa)     och     etanol-metyletylketon- toluen(EMekT). För den fasta fasen användes fysikaliska egenskaper liknande Pyrex.

 

Sammansättnings-  och  temperatur-profiler  visade  att  det  inte  finns  något  motstånd  mot värmeöverföring  i  den  fasta  fasen  och  att  värmeöverföringen  sker  mycket  snabbare  än materieöverförningen.

 

Selektivitetsdiagram ritades. Resultaten indikerar att selektivititen är en viktig parmeter för att förutsäga beteendet vid torkning.

 

Retentionsförhållandet  användes  som  ett  prestandamått.  Dess  variation  med  avseende  på förändringar av  driftsparmetrar,  bland  annat  gasen  hastighet  och  temperatur  samt  den  fasta  fasens temperatur och partikelstorlek, studerades.

 

En modifiering av modellen undersöktes genom att införa en vätskehalts-beroende faktor för diffusionsmotståndet. Detta minskade värdena på retentionsförhållandena.

 

Vibrationens inverkan på värme- och materieöverföring infördes genom att använda Sbrodov samband, och den resulterande effekten på retentionsförhållandet observerades.

Place, publisher, year, edition, pages
2012. , 59 p.
Keyword [en]
Analytical solution, aroma retention ratio, multicomponent mass transfer, selectivity
Keyword [sv]
analytisk lösning, arom retentionsförhållandet, flerkomponent materieöverföring
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-156215OAI: oai:DiVA.org:kth-156215DiVA: diva2:765818
Available from: 2014-11-25 Created: 2014-11-25 Last updated: 2014-12-17Bibliographically approved

Open Access in DiVA

fulltext(795 kB)209 downloads
File information
File name FULLTEXT01.pdfFile size 795 kBChecksum SHA-512
8a544823efc07023efef9fa690d927602fec0541ea1145a6bf5c740c7f049c8717029416644ca108cb14fd67ce87cfff0a000309e0390306ae646b50111d8523
Type fulltextMimetype application/pdf

By organisation
School of Chemical Science and Engineering (CHE)
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 209 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 295 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf