Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique

CIESC Journal ›› 2009, Vol. 17 ›› Issue (3): 522-529.

Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique

付鹏, 胡松, 向军, 孙路石, 杨涛, 张安超, 张军营

State Key Lab of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

收稿日期:2008-12-03 修回日期:2009-04-07 出版日期:2009-06-28 发布日期:2009-06-28
通讯作者: HU Song,E-mail:hssh30@163.com
基金资助:
Supported by the Special Funds for Major State Basic Research Projects of China (2004CB217704);the National NaturalScience Foundation of China (50721005)

Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique

FU Peng, HU Song, XIANG Jun, SUN Lushi, YANG Tao, ZHANG Anchao, ZHANG Junying

State Key Lab of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Received:2008-12-03 Revised:2009-04-07 Online:2009-06-28 Published:2009-06-28
Supported by:
Supported by the Special Funds for Major State Basic Research Projects of China (2004CB217704);the National NaturalScience Foundation of China (50721005)

摘要/Abstract

摘要： 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℃. 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℃. The releasing behavior of CO is similar to H₂O and CO₂ between 200 and 400℃. The production of CH₄ happens, compared to CO₂ and CO, at higher temperatures of 275-400℃ with the maximum at 309℃. When the temperature exceeds 200℃, 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℃, the material becomes increasingly more aromatic and the ether groups decreases with an increase of temperature. The aromatization process starts at ≈350℃ and continues to higher temperatures.

关键词: rice straw, pyrolysis, mechanism, Fourier transform infrared

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℃. 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℃. The releasing behavior of CO is similar to H₂O and CO₂ between 200 and 400℃. The production of CH₄ happens, compared to CO₂ and CO, at higher temperatures of 275-400℃ with the maximum at 309℃. When the temperature exceeds 200℃, 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℃, the material becomes increasingly more aromatic and the ether groups decreases with an increase of temperature. The aromatization process starts at ≈350℃ and continues to higher temperatures.

Key words: rice straw, pyrolysis, mechanism, Fourier transform infrared

付鹏, 胡松, 向军, 孙路石, 杨涛, 张安超, 张军营. Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique[J]. CIESC Journal, 2009, 17(3): 522-529.

FU Peng, HU Song, XIANG Jun, SUN Lushi, YANG Tao, ZHANG Anchao, ZHANG Junying. Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique[J]. , 2009, 17(3): 522-529.

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Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique

Mechanism Study of Rice Straw Pyrolysis by Fourier Transform Infrared Technique

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