|Title:||Bulk permeability characteristics in a biomass moving bed and their effects on reactor design and scaling|
Thengane, Sonal K.
|Published in:||Chemical Engineering Journal|
|Abstract:||Moving or fixed bed reactors are commonly used for continuous processing of biomass in a wide range of applications, such as torrefaction, slow pyrolysis, gasification, and incineration. Many of these moving bed reactors for biomass applications behave like a quasi-fixed bed reactor because of longer solid residence times in comparison to fluid. In order to ensure effective heat and mass transfer through such beds, a good understanding of the bulk hydrodynamic characteristics in the bed is of critical importance. There lacks sufficient data in the literature documenting these characteristics with respect to different types of biomass of various particle sizes. In this paper, we describe both theoretical and experimental frameworks to determine and quantify the bulk bed hydrodynamic characteristics. We assumed—and verified—that the gas flow inside a biomass bed moving at a slow speed can be roughly approximated via Darcy's law. The bulk porosities of different types of biomass are obtained and are observed to often diverge from predictions derived from common empirical correlations. The newfound data is then used for a specific application of designing a torrefaction reactor for scale-up, which showed that under certain conditions, the reactor can be powered entirely by the stack effect generated by a hot column of rising gas without any external pressure drive. It is shown that the developed framework can be useful in informing some fundamental scaling questions regarding biomass reactor operation and performance. © 2021 Elsevier B.V.|
|Citation:||Chemical Engineering Journal, 420|
|Author Scopus IDs:||55776982600|
|Author Affiliations:||Kung, K.S., Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States, Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States, Cyclotron Road Program, Lawrence Berkeley National Laboratory, Berkeley, CA, United States, Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, BC, Canada|
Thengane, S.K., Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States, Department of Hydro and Renewable Energy, Indian Institute of Technology Roorkee, Roorkee, India
Ghoniem, A.F., Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
Lim, C.J., Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, BC, Canada
Sokhansanj, S., Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, BC, Canada
|Funding Details:||The materials and equipment of work was funded by the MIT Tata Center. KSK would like to acknowledge the MIT Tata Center Fellowship, the Cyclotron Road Fellowship, the Dolores Zohrab Liebmann Fellowship, the Legatum Fellowship, and the Natural Sciences and Engineering Research Council of Canada Fellowship for support. SKT would like to acknowledge the MIT Abdul Latif Jameel Water and Food Systems Lab (J-WAFS) for support. Natural Sciences and Engineering Research Council of Canada, NSERC|
|Corresponding Author:||Kung, K.S.; Department of Mechanical Engineering, United States; email: firstname.lastname@example.org|
|Appears in Collections:||Journal Publications [HRE]|
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