DBD低温等离子体气化杨木及模型化合物

DBD low-temperature plasma gasification of poplar and model compounds

本文利用低温等离子体技术,使用介质阻挡放电反应器气化杨木屑、纤维素、木聚糖和木质素,用控制变量法研究了频率、载气对反应系统产气能力的影响以及生物质化学组成的气化特性.结果表明,频率越小、载气电离能越低,气化率越高,杨木的最佳气化率为64.11%;木聚糖和纤维素气化产物相似,较纤维素和木质素产气率更高并且能够产生更多CO;木质素主要生成气化炭.同时,利用SEM、BET对原料及气化炭进行了表征研究得出碱金属在高温下发生结晶;木聚糖在气化过程中会发生熔融;等离子体的高功率以及更多的氧化性物质能够使气化炭比表面积显著增加,达到150.71m^(2)/g.

The low-temperature plasma and a dielectric barrier discharge reactor were used to gasify poplar sawdust,cellulose,xylan and lignin.The control variable method was employed to study the effect of frequency,carrier gas on the gas production capacity,and the gasification characteristics of the chemical composition of biomass.The results showed that the lower frequency and carrier gas ionization energy could take the higher gasification rate,the best gasification rate of poplar was 64.11%.The gasification productions of xylan and cellulose were similar,the gas production rate was higher than that of cellulose and lignin and it could produce more CO.Also,lignin mainly produced coke.At the same time,SEM and BET were used to characterize the raw materials and coke,it was found that alkali metals were crystallized at high temperatures.Xylan could be melted during gasification.And the high power of plasma and more oxidizing substances could make the specific surface area of coke increased significantly,reached to 150.71m^(2)/g.