玉米秸热解动力学研究

生物质能具有低硫和二氧化碳零排放的特点，其在能源结构中的地位越来越重要。作为一种高效生物质能转化途径，热化学转化可获得气、液和固态多种能源产物。其中，热解是热化学转化中最为基本的过程，是气化、液化及燃烧过程的初始和伴生反应，对热解的分析有助于热化学转化过程控制及高效转化工艺的开发。热解动力学是表征热解过程中反应过程参数对原料转化率影响的重要手段，通过动力学分析可深入了解反应过程和机理，预测反应速率及难易程度，为生物质热化学转化工艺的研究开发提供重要的基础数据。国外对纤维素热解动力学已进行了一些研究，但生物质作为纤维素、半纤维素、木质素等的复杂聚合物，其热解行为与单纯纤维素差别较大。因此本文的热解研究集中在玉米秸这种常见的软质秸秆类生物质原料。

Study on the kinetics of corn stalk pyrolysis by TG-DTG analysis

The pyrolysis kinetics is very important for the development of biomass thermal chemical conversion technology. By means of the TG DTG analysis, the pyrolysis behavior and kinetics of corn stalk were investigated with the heating rate from 5℃/min to 100℃/min. The experimental data reveal that the kinetic parameters are much influenced by the operating conditions. And the activation energy of pyrolysis reaction increases with heating rates. Through the kinetics compensation processing, the apparent kinetic parameters of pyrolysis are obtained with the activation energy of 66.5kJ/mol and the frequency factor of 3165s－1. A kinetic model is validated for the corn stalk pyrolysis, which can well fit the experimental results. Moreover, some fundamental data of pyrolysis is provided, which is much valuable for the understanding of process mechanism.