摘要
基于TG-FTIR联用技术,探讨以CaSO_4为载氧体的核桃壳半焦的化学链气化反应动力学特性。结果表明,CaSO_4/核桃壳半焦的反应在约950℃时存在1个失重峰,且反应气体产物主要有CO、CO2、COS、SO_2共4种物质;适当提高CaSO_4/核桃壳半焦的质量配比有利于增强反应活性。利用Ozawa法、Coats-Redfern积分法、Malek法对半焦/CaSO_4进行动力学计算,计算结果表明,随着转化率的增加,活化能呈现降低趋势且反应过程符合相界面收缩球状模型。
Chemical looping gasification of biomass char with CaSO4 as oxygen carrier were carried out using thermo-gravimetric analyzer coupled with Fourier transform infrared spectroscopy （TG-FTIR）and scanning electron microscocpy to get reaction parameters and characteristics. The results showed that, there is a loss peak in the chemical looping gasification process, and CO2, CO, COS, SO2 are founded in the reaction product. We could get that the appropriate proportion could enhance the reactivity of biomass char/CaSO4 from the study on different ratio. The kinetic results from methods of Ozawa, Coats-Redfern and Malek showed that, with the increase of the conversion rate, the activation energy is decreasing. What＇ s more, the shrinking cylinder model with surface reaction was the best model which agrees well with the experiment data.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第7期1643-1649,共7页
Acta Energiae Solaris Sinica
基金
重庆市重点自然科学基金(cstc2013jj B90003)
低品位能源利用技术及系统教育部重点实验室开放基金(LLEUTS-201306)
关键词
核桃壳半焦
CASO4
活化能
机理函数
walnut shell char
CaSO4
activation energy
mechanism function
