Heat and mass transfer to/from active particles in a fluidize bed-An analysis of the Baskakov-Palchonok correlation

Heat and mass transfer to or from single active particles surrounded by inert (passive) particles in a fluidized bed has been investigated based on published correlations. Special emphasis is on the application of a proposal by Baskakov, further developed by Palchonok. This representation describes heat and mass transfer as a function of the size ratio of inert to active particles. Two limits have been chosen: the limit of small active particles, where the active and the inert particles are equal, and the limit of large active particles, where the influence of the size of the active particle has vanished. The presentation aims at finding a suitable relationship, describing the size ratio of inert to active particles on heat and mass transfer to/from particles in fluidized beds and to critically evaluate its usefulness. It seems that the agreement between available correlations is qualitative and only approximate estimations can be made. A generalized scheme for calculations is presented. The formulation is made for bubbling fluidization. A discussion is presented on its use in circulating fluidized bed applications for fuel conversion as well. (C) 2020 The Author(s). Published by Elsevier Ltd.

Automated summary

The heat and mass transfer between single active particles surrounded by inert particles in a fluidized bed is studied, focusing on the size ratio of inert to active particles. A generalized scheme for calculations in bubbling fluidization is presented, along with discussions on its application in fuel conversion.