Estimation of Enthalpy of Bio-Oil Vapor and Heat Required for Pyrolysis of Biomass

Hua Yang, Shinji Kudo, Hsiu-Po Kuo, Koyo Norinaga, Aska Mori, Ondrej Masek, Jun-ichiro Hayashi

Research output: Contribution to journalArticlepeer-review

Abstract

A method is proposed to estimate the enthalpy of bio-oil in vapor phase, Hbo, as a function of temperature in the range of 298.15–1000 K, of which experimental determination has not been done so far. The two equations proposed in this work allow determination of the standard enthalpy of formation, Hbo,0, and the difference in the enthalpy between 298.15 K and a given temperature, ∆H</u>bo(T), respectively, only based on the overall C, H and O contents of crude bio-oil. These equations were optimized using thermodynamic data of 290 and 141 organic compounds for Hbo,0, and ∆Hbo(T), respectively. Given the yields of bio-oil, char and gas, the elemental compositions of the bio-oil and char, and chemical composition of the gas, the proposed equations predict the heat required for the biomass pyrolysis, Qpy(Tpy), which is defined as the enthalpy difference between the products at the pyrolysis temperature, Tpy, and biomass at 298.15 K. The predicted Qpy at Tpy = 773–823 K for five different types of dry biomass was in the range of 1.1–1.6 MJ kg-1.
Original languageEnglish
Pages (from-to)2675-2686
Number of pages12
JournalEnergy & Fuels
Volume27
Issue number5
Early online date19 Mar 2013
DOIs
Publication statusPublished - 16 May 2013

Keywords

  • PYROLYSIS
  • bio-oil
  • enthalpy
  • biomass

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