Abstract
Slow pyrolysis (200–650°C) experiments on citrus residues (orange peel waste “OP” and lemon peel waste “LP”) were carried out in lab scale fixed bed batch reactor. Bio-oil and bio-char obtained by thermal degradation are more stable, more homogeneous and higher energy content fuels when compared to the parent feedstock. Thermogravimetric analysis (TGA) showed higher stability of LP waste, which appears related to the higher lignin content . Mass and energy yields of solid and liquid products (i.e., char and oil) were measured to determine the effects of peak temperature on feedstock. A linear correlation between Gross Calorific Value (GCV), peak temperatures and mass loss (ML) allows easy analytical calculation of energy properties of residues in the range between 200°C and 325°C (peak temperatures). Highest GCV and energy density (ED) of bio-chars are obtained at 500°C peak temperature for both LP and OP residues: EDLP_CHAR=1.70, EDOP_CHAR=1.75. Char reactivities were measured in TGA in a nitrogen atmosphere. High temperature chars (500 and 600°C) showed a higher reactivity than low temperature ones, between 100°C and 400°C. This higher reactivity may be explained by the higher thermal conductivity due to higher ash content and higher surface area of high temperature chars. The tars extracted from pyrolytic bio-oil showed GCVs of approximately 19,700 and 17,000J/g for LP and OP, respectively, independently of pyrolysis peak temperature. Despite the difference in the GCVs, both LP and OP tars show nearly identical FT-IR spectra denoting the presence of very similar chemical species, mainly phenolic, polyaromatics, ketones, ethers and carboxylic acids.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
