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Characteristics of rice husk tar secondary thermal cracking

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  • Zhai, Ming
  • Wang, Xinyu
  • Zhang, Yu
  • Dong, Peng
  • Qi, Guoli
  • Huang, Yudong

Abstract

A two-stage fixed bed pyrolysis system for rice husk tar high-temperature thermal cracking was designed. Pyrolysis of rice husk and high-temperature thermal cracking of the rice husk tar were separated. High-temperature flue gas was used to promote rice husk pyrolysis, and then high-temperature secondary thermal cracking tar started in the high-temperature environment. The characteristics of secondary thermal cracking of rice husk tar were investigated. Results show that rice husk tar yield is 18 mg/kg of dry rice husk, or 11.7 mg/Nm3 at 1200 °C, and no tar is collected at 1300 °C. At the temperature of 1200 °C and residence time of 0.5 s, the rate of decline of tar reaches the maximum. The oxy-organics content in the tar at 700 °C reaches the maximum 24.5% and becomes zero at 1100 °C. The naphthalene content in the tar reaches the maximum 26.4% at 800 °C. With the increase in temperature, all the tar converts into non-condensable gas and char finally.

Suggested Citation

  • Zhai, Ming & Wang, Xinyu & Zhang, Yu & Dong, Peng & Qi, Guoli & Huang, Yudong, 2015. "Characteristics of rice husk tar secondary thermal cracking," Energy, Elsevier, vol. 93(P2), pages 1321-1327.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p2:p:1321-1327
    DOI: 10.1016/j.energy.2015.10.029
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    References listed on IDEAS

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    1. Han, Jun & Kim, Heejoon, 2008. "The reduction and control technology of tar during biomass gasification/pyrolysis: An overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(2), pages 397-416, February.
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    1. Meng, Xiaoxiao & Sun, Rui & Ismail, Tamer M. & Zhou, Wei & Ren, Xiaohan & Zhang, Ruihan, 2018. "Parametric studies on corn straw combustion characteristics in a fixed bed: Ash and moisture content," Energy, Elsevier, vol. 158(C), pages 192-203.
    2. Lin, Qunqing & Zhang, Shuping & Wang, Jiaxing & Yin, Haoxin, 2021. "Synthesis of modified char-supported Ni–Fe catalyst with hierarchical structure for catalytic cracking of biomass tar," Renewable Energy, Elsevier, vol. 174(C), pages 188-198.
    3. Buentello-Montoya, D.A. & Zhang, X. & Li, J., 2019. "The use of gasification solid products as catalysts for tar reforming," Renewable and Sustainable Energy Reviews, Elsevier, vol. 107(C), pages 399-412.
    4. Longwei Pan & Yong Jiang & Lei Wang & Wu Xu, 2018. "Kinetic Study on the Pyrolysis of Medium Density Fiberboard: Effects of Secondary Charring Reactions," Energies, MDPI, vol. 11(9), pages 1-17, September.

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