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Comparison of direct and indirect contact heat exchange to improve recovery of bio-oil

Author

Listed:
  • Dalluge, Dustin L.
  • Whitmer, Lysle E.
  • Polin, Joseph P.
  • Choi, Yong S.
  • Shanks, Brent H.
  • Brown, Robert 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.

Suggested Citation

  • Dalluge, Dustin L. & Whitmer, Lysle E. & Polin, Joseph P. & Choi, Yong S. & Shanks, Brent H. & Brown, Robert C., 2019. "Comparison of direct and indirect contact heat exchange to improve recovery of bio-oil," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    • Handle: RePEc:eee:appene:v:251:y:2019:i:c:48
    DOI: 10.1016/j.apenergy.2019.113346
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    Cited by:

    1. Zha, Yunfei & He, Shunquan & Meng, Xianfeng & Zuo, Hongyan & Zhao, Xiaohuan, 2023. "Heat dissipation performance research between drop contact and immersion contact of lithium-ion battery cooling," Energy, Elsevier, vol. 279(C).
    2. Wang, Chu & Yuan, Xinhua & Li, Shanshan & Zhu, Xifeng, 2021. "Enrichment of phenolic products in walnut shell pyrolysis bio-oil by combining torrefaction pretreatment with fractional condensation," Renewable Energy, Elsevier, vol. 169(C), pages 1317-1329.

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