Experimental investigation of hardwood air gasification in a pilot scale bubbling fluidized bed reactor and CFD simulation of jet/grid and pressure conditions

Nam, Hyungseok; Rodriguez-Alejandro, David Aaron; Adhikari, Sushil; Brodbeck, Christian; Taylor, Steven; Johnson, James

doi:10.1016/j.enconman.2018.05.003

Title: Experimental investigation of hardwood air gasification in a pilot scale bubbling fluidized bed reactor and CFD simulation of jet/grid and pressure conditions

Journal Article · 25 May 2018 · Energy Conversion and Management

DOI: https://doi.org/10.1016/j.enconman.2018.05.003 · OSTI ID:1781056

^[1]; Rodriguez-Alejandro, David Aaron ^[2];

^[3]; Brodbeck, Christian ^[3]; Taylor, Steven ^[3]; Johnson, James ^[3]

Auburn University, AL (United States); Korea Institute of Energy Research (KIER), Daejeon (Korea); Auburn University
University of Guanajuato (Mexico)
Auburn University, AL (United States)

A pilot scale pressurized (50 psi) fluidized bed gasification was performed to investigate the effects of the jet/ grid air ratio (5:95–90:10) and equivalence ratio (ER = 0.23–0.45) on the gasification products such as syngas, tar, contaminant gas, and biochar. There was a noticeable effect of the jet/grid ratios on the syngas concentration. An increase in CO, CH₄, and C₂ gases was obtained at the condition closer to jet/grid = 50:50, whereas a higher jet/grid ratio favored water–gas shift reaction by increasing CO₂ and H₂ gases under the pressurized condition. The highest lower heating value (LHV) of 7.7 MJ/Nm³ was obtained at the lowest ER = 0.23. Both the jet/grid ratio and ER were important parameters in determining the H₂ concentration. The cold gasification and carbon conversion efficiencies were obtained as high as 66% and 94%, respectively. Also, higher temperature and ER promoted a reduction in contaminant gases as well as tar yield. Tar product yield was also reduced significantly after a wet scrubber, and the tar consisted of chemicals of a carbon number less than 13 (≤C₁₂). Here, the gasification biochar was also analyzed and showed an effective carbon sequestration property with a relatively higher surface area (105 m²/g). Furthermore, computational fluid dynamics simulation was performed to determine the effects of different jet/grid air ratio and pressure conditions on the hydrodynamics in the fluidized bed reactor.

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Research Organization:: University of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); US Department of Agriculture

Grant/Contract Number:: EE0006639

OSTI ID:: 1781056

Journal Information:: Energy Conversion and Management, Journal Name: Energy Conversion and Management Vol. 168; ISSN 0196-8904

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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