Sušenje u fluidiziranom sloju - Utjecaj procesnih parametara na kinetiku sušenja i morfologiju kristala

undergraduate thesis

• Title (english): Fluidized bed drying - Influence of process parameters on drying kinetics and crystal morphology
• Author: Katarina Jozinović
• Mentor: Aleksandra Sander (mentor)
• Committee member: Aleksandra Sander (predsjednik povjerenstva)
• Committee member: Jasna Prlić Kardum (član povjerenstva)
• Committee member: Igor Dejanović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-09-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U ovom je radu istražena kinetika sušenja natrijeve soli cirkonija u različitim laboratorijskim sušionicima. Odabrana su dva vakuum sušionika, jedan s pliticama i jedan rotacijski te sušionik s fluidiziranim slojem. Osim vrste sušionika, istražen je i utjecaj početnog sadržaja vlage materijala kao i temperature na kinetiku sušenja i morfološka svojstva osušenih kristala. Kinetika sušenja praćena je gravimetrijski u vakuum sušionicima te psihrometrijski u sušioniku s fluidiziranim slojem. U sušioniku s fluidiziranim slojem također je istraženo može li se bliskom infracrvenom spektroskopijom (NIR, engl. Near InfraRed) pratiti kinetika sušenja. Mjerni podaci aproksimirani su Lewisovim i Pageovim matematičkim modelom te je za svaku vrstu sušionika odabran model koji uz najviši stupanj korelacije opisuje kinetiku sušenja. Parametri oba modela dovedeni su u vezu s uvjetima provedbe procesa sušenja. Rezultati su pokazali da vrsta sušionika i temperatura utječu na kinetiku sušenja i morfologiju kristala. Veće brzine sušenja ostvarene su pri višim temperaturama. Pri nižim temperaturama sušenje je brže u sušioniku s fluidiziranim slojem, a pri višim temperaturama u vakuum sušionicima. U rotacijskom vakuum sušioniku i u sušioniku s fluidiziranim slojem dolazi do loma kristala. Bliska infracrvena spektroskopija pokazala se kao dobra metoda praćenja kinetike sušenja u fluidiziranom sloju.

Abstract (english)

This paper explores drying kinetics of zirconium sodium salt in different laboratory dryers. Drying was performed in two vacuum dryers, a tray dryer, a rotary dryer and a fluid bed dryer. Additionally, the effect of starting humidity levels and temperature on drying kinetics and morphological properties of dried crystals was explored. Drying kinetics was monitored gravimetrically in vacuum dryers and psychrometrically in fluid bed dryer. The possibility of monitoring drying kinetics with Near InfraRed spectroscopy in fluid bed dryer was also explored. Measurements were approximated with Lewis and Page mathematical models and the model with the highest correlation coefficient that was selected for each dryer. The parameters of both models were correlated with drying conditions. The results show that the type of dryer and the temperature affect drying kinetics and morphology of the crystals. At lower temperatures, drying was faster in fluid bed dryer whereas when the temperatures were higher, drying was faster in vacuum dryers. In rotational vacuum dryer and fluid bed dryer the crystals broke. Near InfraRed spectroscopy proved to be a good method for monitoring drying kinetics in a fluidized bed.

• Keywords: kinetika sušenja; matematički modeli; bliska infracrvena spektroskopija; sušenje u fluidiziranom sloju; vakuum sušenje
• Keywords (english): drying kinetics; mathematical models; Near InfraRed spectroscopy; fluid bed drying; vacuum drying
• Language: croatian
• URN:NBN: urn:nbn:hr:149:566100
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-05-23 13:18:35