Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique

doi:10.1016/S1004-9541(08)60240-2

Chinese Journal of Chemical Engineering

Volume 17, Issue 3, June 2009, Pages 522-529

https://doi.org/10.1016/S1004-9541(08)60240-2 Get rights and content

Abstract

The pyrolysis mechanism of rice straw (RS) was investigated using a tube reactor with Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analyzer. The results show that the maximum pyrolysis rate increases with increasing heating rate and the corresponding temperature also increases. The three-pseudocomponent model could describe the pyrolysis behavior of rice straw accurately. The main pyrolysis gas products are H₂O, CO₂, CO, CH₄, HCHO (formaldehyde), HCOOH (formic acid), CH₃OH (methanol), C₆H₅OH (phenol), etc. The releasing of H₂O, CO₂, CO and CH₄ mainly focuses at 220-400°C. The H₂O formation process is separated into two stages corresponding to the evaporation of free water and the formation of primary volatiles. The release of CO₂ first increases with increasing temperature and gets the maximum at 309°C. The releasing behavior of CO is similar to H₂O and CO₂ between 200 and 400°C. The production of CH₄ happens, compared to CO₂ and CO, at higher temperatures of 275-400°C with the maximum at 309°C. When the temperature exceeds 200°C, hydroxyl and aliphatic C-H groups decrease significantly, while C

O, olefinic C

C bonds and ether structures increase first in the chars and then the aromatic structure develops with rising temperature. Above 500°C, the material becomes increasingly more aromatic and the ether groups decreases with an increase of temperature. The aromatization process starts at ≈350°C and continues to higher temperatures.

References (24)

H. Yang et al.
“Characteristics of hemicellulose, cellulose and lignin pyrolysis”
Fuel
(2007)
M. Becidan et al.
“Products distribution and gas release in pyrolysis of thermally thick biomass residues samples”
J. Anal. Appl. Pyrolysis
(2007)
R. Yan et al.
“Influence of temperature on the distribution of gaseous products from pyrolyzing palm oil wastes”
Combustion and Flame
(2005)
S. Hu et al.
“Kinetic study of Chinese biomass slow pyrolysis: Comparison of different kinetic models”
Fuel
(2007)
B.V. Babu et al.
“Pyrolysis of biomass: Improved models for simultaneous kinetics and transport of heat, mass and momentum”
Energy Conversion and Management
(2004)
Y.H. Park et al.
“Pyrolysis characteristics and kinetics of oak trees using thermogravimetric analyzer and micro-tubing reactor”
Bioresource Technology
(2009)
M. Muller-Hagedorn et al.
“A comparative kinetic study on the pyrolysis of three different wood species”
J. Anal. Appl. Pyrolysis
(2003)
T. Fisher et al.
“Pyrolysis behavior and kinetics of biomass derived materials”
J. Anal. Appl. Pyrolysis
(2002)
T.B. Reed et al.
“Atlas of thermal data of biomass and other fuels-A report on the forthcoming book”
Biomass and Bioenergy
(1994)
P. Grammelis et al.
“Pyrolysis kinetics and combustion characteristics of waste recovered fuels”
Fuel
(2009)

H.M. Zhu et al.

“Study on pyrolysis of typical medical waste materials by using TG-FTIR analysis”

Journal of Hazardous Materials

(2008)

Q. Liu et al.

“Mechanism of wood lignin pyrolysis by using TG-FTIR analysis”

J. Anal. Appl. Pyrolysis

(2008)

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: Supported by the Special Funds for Major State Basic Research Projects of China (2004CB217704), and the National Natural Science Foundation of China (50721005).

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Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique

Abstract

Fuel

J. Anal. Appl. Pyrolysis

Combustion and Flame

Fuel

Energy Conversion and Management

Bioresource Technology

J. Anal. Appl. Pyrolysis

J. Anal. Appl. Pyrolysis

Biomass and Bioenergy

Fuel

Journal of Hazardous Materials

J. Anal. Appl. Pyrolysis