煤焦-CO 2高温气化反应特性的实验研究.pdf

煤焦-CO_2高温气化反应特性的实验研究1
2 2
2 tion temperature and gas flowrate on gasification reaction were investigated with relevant
kinetic parameters calculated. The results showed that when the gasification temperature is lower
than the fusion point of char ash , the coal char CO2 conversion rate and the peak value of reaction
rate both increase with increasing gasification temperature. However , when the gasification
temperature is higher than the fusion point , the carbon conversion and reaction rates both change
so slowly even tend to decrease. The kinetic parameters on gasification reaction with different
types of coal char used differ from each other , e. g. , the activation energy of coal char used in
Ansteel and Bensteel is 140 kJ/ mol , while that of the coal char from Fuxin is just 70 kJ/ mol.
Then , the diffusion becomes the main bottleneck to the gasification reaction if the gasification
temperature is higher than the fusion point of char ash. So , increasing the gas flowrate will
benefit the char CO2 gasification reaction.
Key words : coal char ; gasification ; kinetics ; the isothermal thermogravimetry ; CO2
近年来 ,随着石油价格的不断攀升和环境问 解和煤焦气化两部分 ,煤的气化反应性很大程度
题的日益严重 ,发展先进的洁净煤技术已迫在眉