Comparative Investigation of the CO2 Gasification Characteristics of Biomass In-situ Char and Ex-situ Char

YI Qiu-ming; LIU Hua-cai; YIN Xiu-li; WU Chuang-zhi

doi:10.3969/j.issn.2095-560X.2015.03.002

Advances in New and Renewable Energy >

2015 , Vol. 3 >Issue 3: 169 - 176

DOI: https://doi.org/10.3969/j.issn.2095-560X.2015.03.002

Comparative Investigation of the CO2 Gasification Characteristics of Biomass In-situ Char and Ex-situ Char

YI Qiu-ming ,
LIU Hua-cai ,
YIN Xiu-li ,
WU Chuang-zhi

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1. CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2015-03-26

Revised date: 2015-04-23

Online published: 2015-06-30

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Abstract

The CO₂ gasification characteristics of in-situ char and ex-situ char of biomass were comparatively investigated by using rice straw and pine as samples. Effects of char structure and metal catalyst on difference of the char gasification reactivity were explored by acid-washing and catalyst loading, respectively. Kinetic analysis was conducted with a hybrid model. The results show that, gasification reactivity of in-situ char is significantly higher than that of ex-situ char. During the process of cooling and reheating, the organic functional groups in char undergo further breakage and recombination, leading to volatilization and more stable aromatic structures. Besides, the morphology of metal catalyst is changed and more stable linkage may be formed between metal and char matrix, which deactivate the catalyst. Activation energy of the in-situ char and the ex-situ char are slightly different from each other, while the pre-exponential factors differ widely, which can be attributed to the numbers of active spot on char surface.

Key words： biomass; in-situ char; ex-situ char; gasification

Cite this article

YI Qiu-ming , LIU Hua-cai , YIN Xiu-li , WU Chuang-zhi . Comparative Investigation of the CO2 Gasification Characteristics of Biomass In-situ Char and Ex-situ Char[J]. Advances in New and Renewable Energy, 2015 , 3(3) : 169 -176 . DOI: 10.3969/j.issn.2095-560X.2015.03.002

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