Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/61792
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Type: Journal article
Title: On the burning of sawdust in a MILD combustion furnace
Author: Dally, B.
Shim, S.
Craig, R.
Ashman, P.
Szego, G.
Citation: Energy and Fuels, 2010; 24(6):3462-3470
Publisher: Amer Chemical Soc
Issue Date: 2010
ISSN: 0887-0624
1520-5029
Statement of
Responsibility: 
Bassam. B. Dally, Sung Hoon Shim, Richard. A. Craig, Peter J. Ashman and George G. Szegö
Abstract: The purpose of this work is to extend the applicability of moderate or intense low oxygen dilution (MILD) combustion to solid biomass fuels. A laboratory-scale furnace fitted with a parallel jet burner was operated in conventional nonpremixed flame mode, and in MILD combustion mode, using either natural gas or pine sawdust particles. Sawdust with particle sizes in the range of 212-355 μ were injected into the furnace using either air, CO2, or N2 as a carrier gas. Measurements of in-furnace wall temperatures and exhaust gas emissions of O2, CO, NOx, and ash are presented, together with visual observations at the burner exit region. It was found, through detailed comparisons, that MILD combustion was established without air preheat for both gaseous and solid fuels, suggesting that the parallel jet burner system is suitable for MILD combustion. A 3-fold reduction in NOx emissions and an increase in CO were recorded during the transition from conventional to MILD combustion using natural gas. The optimal equivalence ratio (φ) to reduce both CO and NOx emissions, when burning sawdust, was determined to be in the range of φ = 0.71-0.75, with CO2 as the carrier gas, and at φ ≈ 0.75, with N2 as the carrier gas. Ash content analysis showed that the extent of carbon burnout was low, which is thought to be due to the relatively short furnace residence times. © 2010 American Chemical Society.
Rights: Copyright © 2010 American Chemical Society
DOI: 10.1021/ef901583k
Published version: http://dx.doi.org/10.1021/ef901583k
Appears in Collections:Aurora harvest 5
Chemical Engineering publications
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