生物质成型燃料的热重分析及动力学研究  

Thermo Gravimetric Analysis and Kinetics of Biomass Briquette Fuels

作　　者：蒋绍坚[1] 黄靓云 彭好义[1] 唐富强[1] 姚昆[1] 

机构地区：[1]中南大学能源科学与工程学院,长沙410083

出　　处：《新能源进展》2015年第2期81-87,共7页Advances in New and Renewable Energy

基　　金：中央高校基金科研业务费专项研究项目(2010QZZD);"可再生能源电力技术"湖南省重点实验室基金(2011DFJJ002)

摘　　要：对三种生物质成型燃料在不同气氛下和不同升温速率下进行热重实验,研究反应条件对生物质成型燃料失重特性的影响规律,并对其空气气氛下的动力学特性进行了分析。研究结果表明,生物质在空气气氛下的挥发分析出速率比N2气氛下高,随着温度升高,N2气氛下主要是纤维素、半纤维素以及木质素的分解,而空气气氛下还伴随有其分解产物的燃烧。生物质中挥发分含量较高时,反应活性也比较高。实验温度由室温升至800℃时,在升温速率为10℃/min^25℃/min范围内,随着升温速率的升高,松木热重曲线先向低温区移动再向温度较高的一侧移动,最大失重速率对应的温度也表现出相同规律,当升温速率为20℃/min时最大失重速率对应的温度最低,升温速率为25℃/min时失重峰值最大。动力学特性分析表明,采用2组分动力学模型可以较好地表征生物质在空气中的失重特性,计算结果与实验结果吻合度较高。To study the influence law of reaction conditions on the weightlessness characteristics of biomass briquette, the thermo gravimetric experiment is taken on three types of biomass briquettes under different atmospheres and heating rates, and a mathematical model is established to analyze the dynamic properties of biomass in air. The results show that the volatile emission rate of biomass in air is higher than that in nitrogen atmosphere. With the temperature increasing, the biomass mainly performs decomposition of cellulose, hemicellulose and lignin in nitrogen atmosphere, while it performs decomposition of the components mentioned above and combustion of their decomposition products. It is found that the biomass containing higher volatile component performs higher reactivity in comparison of the heating process of different kinds of biomass. The DTG curves of pine move to low temperature region, then to the high part with heating rate increasing from 10℃/min to 25℃/min, and the temperature with maximum weight loss rate performs the similar trend. The temperature with maximum weight loss rate is lowest at 20℃/min, and the weight loss peak is highest at 25℃/min. The dynamics analysis indicates that the thermo gravimetric properties of biomass can be adequately characterized at atmospheric condition using the two-component model, and that the numerical simulation results agree with the experimental data.

关 键 词：生物质 热重分析 升温速率 反应活性 动力学模型 

分 类 号：TK6[动力工程及工程热物理—生物能]