生物质热解半焦燃烧特性的实验研究

Experimental Study on Combustion Characteristics of Biomass Pyrolytic Semi-cokes

鉴于目前针对生物质热解半焦燃烧特性的研究较少,以稻壳、松木屑和玉米秸秆为原料,利用自行搭建的固定床热解实验台,在300、400、500、600℃的热解温度下制备了以上3种生物质的半焦,同时采用TG-DTG热分析联用技术,研究热解终温、粒径、升温速率和生物质种类对生物质热解半焦燃烧特性的影响。结果表明:热解终温越高,半焦的燃烧性能越差;同一种半焦,粒径越小越有利于其着火与燃尽;升温速率为50℃/min时,燃烧性能达到最佳;不同生物质种类制得的半焦燃烧性能差异很大。

Considering the fact that few studies on combustion characteristics of the biomass pyrolytic semicokes can be seen at present,through selecting the rice husk,pine sawdust and corn straw as raw materials,the self-designed fixed-bed pyrolytic test rig was adopted to prepare the above-said biomass semi-cokes at the temperature of 300,400,500,600℃ respectively,and TG-DTG hyphenated technique was employed to investigate into the impact of final pyrolysis temperature,particle size,heating rate and biomass species on the combustion characteristics of semi-cokes. The results show that the higher final pyrolysis temperature can result in the semi-cokes＇ worse combustion performance; for the same biomass semi-coke,the semi-coke with smaller particle size can benefit the combustion and when the heating rate stays at 50℃ / min,the semi-cokes＇ combustion performance achieves the best. The combustion performance of the different biomass＇ s semi-cokes differs greatly.