Analytical Model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles

doi:10.1016/S1004-9541(13)60577-7

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (10): 1114-1120.DOI: 10.1016/S1004-9541(13)60577-7

• 催化、动力学与反应工程 • 上一篇下一篇

Analytical Model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles

Alireza Rahbari¹, Fatemeh Ebrahiminasab², Mehdi Bidabadi²

1 Department of Mechanical Engineering, Shahid Rajaee Teacher Training University (SRTTU), Tehran, Iran;
2 Department of Mechanical Engineering, Iran University of Science and Technology, Combustion Research Laboratory, Narmak, Tehran, Iran

收稿日期:2011-01-28 修回日期:2012-12-28 出版日期:2013-10-28 发布日期:2013-10-29
通讯作者: Fatemeh Ebrahiminasab

Analytical Model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles

Alireza Rahbari¹, Fatemeh Ebrahiminasab², Mehdi Bidabadi²

1 Department of Mechanical Engineering, Shahid Rajaee Teacher Training University (SRTTU), Tehran, Iran;
2 Department of Mechanical Engineering, Iran University of Science and Technology, Combustion Research Laboratory, Narmak, Tehran, Iran

Received:2011-01-28 Revised:2012-12-28 Online:2013-10-28 Published:2013-10-29
Contact: Fatemeh Ebrahiminasab

摘要/Abstract

摘要： This paper presents the combined influence of heat-loss and radiation on the pyrolysis of biomass particles by considering the structure of one-dimensional, laminar and steady state flame propagation in uniformly premixed wood particles. The assumed flame structure consists of a broad preheat-vaporization zone where the rate of gas-phase chemical reaction is small, a thin reaction zone composed of three regions: gas, tar and char combustion where convection and the vaporization rate of the fuel particles are small, and a broad convection zone. The analysis is performed in the asymptotic limit, where the value of the characteristic Zeldovich number is large and the equivalence ratio is larger than unity (i.e.Ψ≥1). The principal attention is made on the determination of a non-linear burning velocity correlation. Consequently, the impacts of radiation, heat loss and particle size as the determining factors on the flame temperature and burning velocity of biomass particles are declared in this research.

关键词: analytical model, heat loss, radiation, particle size, pyrolysis, flame temperature, burning velocity

Abstract: This paper presents the combined influence of heat-loss and radiation on the pyrolysis of biomass particles by considering the structure of one-dimensional, laminar and steady state flame propagation in uniformly premixed wood particles. The assumed flame structure consists of a broad preheat-vaporization zone where the rate of gas-phase chemical reaction is small, a thin reaction zone composed of three regions: gas, tar and char combustion where convection and the vaporization rate of the fuel particles are small, and a broad convection zone. The analysis is performed in the asymptotic limit, where the value of the characteristic Zeldovich number is large and the equivalence ratio is larger than unity (i.e.Ψ≥1). The principal attention is made on the determination of a non-linear burning velocity correlation. Consequently, the impacts of radiation, heat loss and particle size as the determining factors on the flame temperature and burning velocity of biomass particles are declared in this research.

Key words: analytical model, heat loss, radiation, particle size, pyrolysis, flame temperature, burning velocity

Alireza Rahbari, Fatemeh Ebrahiminasab, Mehdi Bidabadi. Analytical Model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles[J]. Chinese Journal of Chemical Engineering, 2013, 21(10): 1114-1120.

Alireza Rahbari, Fatemeh Ebrahiminasab, Mehdi Bidabadi. Analytical Model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles[J]. Chin.J.Chem.Eng., 2013, 21(10): 1114-1120.

参考文献

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Analytical Model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles

Analytical Model for Predicting the Heat Loss Effect on the Pyrolysis of Biomass Particles

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