Biomass fast pyrolysis in a drop tube reactor for bio oil production: Experiments and modeling

FUEL

卷:207

Article

Guizani, Chamseddine¹  Valin, Sylvie¹  Billaud, Joseph¹  Peyrot, Marine¹  Salvador, Sylvain² 

[1] CEA, LITEN DTBH SBRT LTB, F-38054 Grenoble 09, France

[2] CNRS, Mines Albi, RAPSODEE, UMR 5302, Route Teillet, F-81013 Albi 09, France

关键词: Biomass;    Fast-pyrolysis;    Drop tube reactor;    Experiments;    Modeling;   

DOI  :  10.1016/j.fuel.2017.06.068

来源: Elsevier

【 摘 要 】

Woody biomass fast pyrolysis in Entrained Flow Reactor (EFR) is studied both with experiments in a lab-scale drop tube reactor (DTR) and simulations with a 1-D model. The parameters of the study are temperature (450-600 degrees C), woody biomass particle size (370-640 mu m) and gas residence time (12.6-20.6 s). The most critical phenomena affecting the bio-oil yield are considered in the model: heating of the biomass particles, slip velocity of the biomass particles varying with biomass/char properties, biomass pyrolysis and tar cracking. The analyses of all products - char, bio-oil and gas - also brought information on the advancement of the pyrolysis and cracking for the different tests. The reactor temperature and particle size were found to have a major influence on the pyrolysis product distribution. The production of bio-oil reaches a maximum of 62.4 wt.% at 500 degrees C for the 370 mm particles. The particle conversion advancement is then estimated at 94% at the reactor exit. The bio-oil yield is lower at higher temperatures for a constant particle size due to tar cracking. At 550 degrees C, increasing the particle size from 370 mm to 640 mu m induces a decrease of the bio-oil yield from 48.3 to 34.8 wt.%, which was shown to be due to incomplete pyrolysis of the particles, because of a too short residence time as well as a too long heating time of particles. The pyrolysis conditions - temperature, particle size - were not found to have any significant influence on the bio-oil properties, such as acidity. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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