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Study on the steam gasification reaction of biomass char under the synergistic effect of Ca‐Fe : Analysis of kinetic characteristics
Author(s) -
Wu Yuting,
Pang Yunji,
Chen Yisheng,
Zhai Maosen,
Zheng Mingjie
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6366
Subject(s) - char , activation energy , chemistry , reaction rate , chemical engineering , sintering , biomass (ecology) , diffusion , kinetic energy , catalysis , thiele modulus , thermodynamics , materials science , pyrolysis , organic chemistry , oceanography , physics , engineering , geology , quantum mechanics
Summary Biomass char gasification is an important part of biomass conversion technology; the addition of additives can effectively change the gasification reaction rate of char. The kinetic characteristics of steam gasification reaction of biomass char particles were explored by adding CaO, Fe 2 O 3 , and Ca‐Fe mixed catalyst to biomass, and the apparent activation energy and pre‐exponential factors of char particles were obtained. Experimental results show that the kinetic reaction process of char steam gasification follows the shrinking cylinder model. Through linear fitting, it can be obtained that there is a good linear correlation between activation energy and pre‐exponential factor, which follows the dynamic compensation effect. Under the same temperature conditions, CaO can accelerate the reaction rate of char, while Fe 2 O 3 can delay the gasification rate of char particles because of sintering phenomenon at high temperature. The synergistic effect of Ca‐Fe can reduce the total activation energy of the reaction. The addition of CaO can greatly change the kinetic performance of the Fe 2 O 3 catalyst, inhibit the sintering deactivation reaction of Fe 2 O 3 at high temperature, increase the diffusion path of steam, and promote the char steam gasification reaction.