煤的快速热解动力学研究

煤的快速加热条件下的热解研究对煤气化反应过程以及气化炉的运行有着重要的意义。试验采用TGA/SDTA 851型热天平对不同煤种、不同升温速率、不同灰煤比下的煤快速热解特性进行研究，同时对3种气氛下煤的动力特性进行分析。研究发现：随着升温速率的增加，最大失重速率也有所提高；随着煤的变质程度提高，热解最大失重速率有所降低；随着灰/煤比的增加，失重速率先升后降。说明存在一个最佳的灰/煤比，使得失重速率达到最大值；在N2、、O2、CO2 3种气氛下，CO2气氛下的气化反应进行的温度要高于N2气氛下的热解和O2气氛下的燃烧温度，气化与燃烧相比，气化反应进行的剧烈程度远远小于燃烧。文中也根据Coast-Redfern积分方法得出了煤热解的表观动力学参数。

Research on Fast Thermolysis Kinetics of Coal

It is important to make pyrolysis research during coal fast heating-up condition for coal gasification process and operation of gasifier. Research of coal fast pyrolysis character was made by using TGA/SDTA 851 thermo-gravimetric analyzer with different type coals, different heating-up speed rate, different coal/ash rate in the experiment. Results shows, with heating-up speed rate increase, maximal weight loss speed rate increases. With coal degree of metamorphism increases, maximal weight loss speed rate reduces. With coal/ash rate increase, weight loss speed rate increases at first and then reduces, it is concluded that optimal coal/ash rate exist. In N2, O2, CO2 three type atmosphere, gasification temperature in CO2 is higher than pyrolysis in CO2 and combustion in O2. Combustion reaction is much stronger than gasification. Apparent kinetics parameter is obtained by Coast-Redfern integration method .