 Comparison of direct and indirect contact heat exchange to improve recovery of bio-oilDustin L. Dalluge, Lysle E. Whitmer, Joseph P. Polin, Yong S. Choi, Brent H. Shanks and Robert C. Brown Applied Energy, 2019, vol. 251, issue C, - Abstract: This study investigates whether the rate of cooling of pyrolysis vapors affects the composition of the resulting bio-oil. Pure cellulose was pyrolyzed in a laboratory-scale fluidized bed reactor at 500 °C and the bio-oil collected in either an indirect contact heat exchange (conventional water-cooled condenser system) or a direct contact heat exchange (liquid quench) system developed in our laboratory. The liquid quench system was estimated to achieve a seven-fold increase in cooling rate compared to the water-cooled condensers. Direct contact cooling in the quench system also eliminated temperature gradients experienced by films of bio-oil running down the walls of the water-cooled condensers. The combination of these two factors helped reduce secondary decomposition of primary pyrolysis products, especially anhydrosugars such as levoglucosan. The quench system increased the yield of levoglucosan by over 20% while minimally effecting yield of other compounds. Keywords: Cellulose; Pyrolysis; Levoglucosan; Heat exchange; Primary reaction; Secondary reaction (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:251:y:2019:i:c:48 Ordering information: This journal article can be ordered from DOI: 10.1016/j.apenergy.2019.113346 Access Statistics for this article Applied Energy is currently edited by J. Yan More articles in Applied Energy from Elsevier |
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