Heat transfer from an immersed fixed silver sphere to a gas fluidised bed of very small particles

Thermal Science

Harmsen Jan¹  Maziarka Przemyslaw²  De Smedt Jonas²  Prins Wolter²  Ronsse Frederik²  Van Swaaij Wim³ 

[1] Harmsen Consultancy b.v., Nieuwerkerk aan den IJssel, The Netherlands;University of Ghent, Faculty of Bioscience Engineering, Ghent, Belgium;University of Twente, Faculty of Science and Technology, Enschede, The Netherlands;

关键词: fluidization;    heat transfer;    heat transfer coefficient;    immersed sphere;    fine particles;    fluid catalytic cracking fines;    air;    helium;   

DOI  :  10.2298/TSCI180928175P

来源: DOAJ

【 摘 要 】

Results of unique heat transfer measurement in beds of fine, cracking catalyst particles, fluidized by air or helium gas, are compared with predictions from a theoretical model presented in the literature, and also with an earlier established empirical correlation. Moreover, the results have been related to dense phase flow conditions around a silver heat transfer probe by a simple turbulence model. A maximum heat transfer coefficient of h = 2300 W/m2K has been measured in a bed of 14μm (average diameter) particles, fluidized by helium gas. The data collected, and the model developed, can be used for the design of heat transfer tubes in fluidized beds of fine particles as for instance in fluid catalytic cracking (FCC) of crude oil heavy residues. The FCC is one of the most important conversion processes in the petroleum refineries.

【 授权许可】

Unknown