Analysis of volumetric mass transfer and overall gas hold-up in gas-liquid reactors relating to gas fermentation
Bogatenko, Daria (2017)
Diplomityö
Bogatenko, Daria
2017
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe201708118081
https://urn.fi/URN:NBN:fi-fe201708118081
Tiivistelmä
The concept of gas fermentation is of great interest nowadays. Flue gases of manufactories can be utilized as a feedstock for production of biofuels, such as ethanol. The process of fermentation involves gas-liquid mixing that is why the specific parameters of these systems were studied.
Volumetric mass transfer, gas hold-up, flooding, bubble size and other parameters make significant effect on gas-liquid mixing system. Also, these parameters are deeply connected to each other and all together form system that provide mixing efficiency. Gas hold-up is in almost linear relation with gas flow rate. However, if bubbles are not well dispersed the increase of gas flow rate can result in decrease of gas-liquid mass transfer.
The thesis was aimed at the comparison of gas-liquid mixing parameters for three reactors at laboratory scale. The conventional air-lift and stirred tank reactors were compared with new reactor OKTOP designed by Outotec company.
Based on achieved experimental results coefficients for the equations of mass transfer, power draw and gas hold-up were determined for all the reactors in studied solutions.
Volumetric mass transfer, gas hold-up, flooding, bubble size and other parameters make significant effect on gas-liquid mixing system. Also, these parameters are deeply connected to each other and all together form system that provide mixing efficiency. Gas hold-up is in almost linear relation with gas flow rate. However, if bubbles are not well dispersed the increase of gas flow rate can result in decrease of gas-liquid mass transfer.
The thesis was aimed at the comparison of gas-liquid mixing parameters for three reactors at laboratory scale. The conventional air-lift and stirred tank reactors were compared with new reactor OKTOP designed by Outotec company.
Based on achieved experimental results coefficients for the equations of mass transfer, power draw and gas hold-up were determined for all the reactors in studied solutions.