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Tesi etd-06252018-102720


Thesis type
Tesi di laurea magistrale
Author
BERNARDINI, LUCA
URN
etd-06252018-102720
Title
Improvement and force transmission error analysis of two gravimetric sorption analyzers, and application to adsorption measurement
Struttura
INGEGNERIA DELL'ENERGIA, DEI SISTEMI, DEL TERRITORIO E DELLE COSTRUZIONI
Corso di studi
INGEGNERIA ENERGETICA
Commissione
relatore Prof. Desideri, Umberto
correlatore Prof. Richter, Markus
Parole chiave
  • tandem sinker densimeter
  • magnetic coupling
  • adsorption
  • carbon dioxide
Data inizio appello
13/07/2018;
Consultabilità
completa
Riassunto analitico
Force transmission error analysis was applied to improve two different gravimetric sorption analyzer based on magnetic suspension balance technology. For the setup, improvement and commissioning of the apparatuses the following steps were conducted: installation and modification of mechanical parts and devices, execution of the calibrations required, software development, and data analyzing. Force transmission error parameters and density of nitrogen were investigated and compared with reference values available in literature. Three different kind of measurements were conducted: vacuum measurements to calculate the apparatus contribution, synthetic air measurements with a mixture of 20,5 ± 0,5 % of O2 in N2 to determine the apparatus specific constant, and pure nitrogen measurements to calculate the correction factor and therefore determine the density of N2. Vacuum measurements were conducted at different temperatures, 20, 50 and 80 °C, and synthetic air and nitrogen measurements were conducted at 20 °C at different pressures, 20, 40, 60 up to 80 bar. Once improved, the second apparatus analyzed was applied to sorption equilibrium and kinetic sorption measurements. A sample of synthetic hydrocarbon char (FE/HTC-800) was investigated, measurements conducted in vacuum mode at 25 °C and using CO2 at 25 and 50 °C combined with different pressures, 0,5, 1, 2 up to 4 bar. Equilibrium data were calculated before and after force transmission error correction, and also compared with data carried out with a volumetric apparatus at University of Western Australia in Perth. Kinetic data were analyzed using the models of Carslaw and Jaeger and Kociric et al. and the effective diffusion coefficient was carried out.
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