3种典型水生生物质热解特性的对比研究

Comparation of pyrolysis characteristics of three typical aquatic biomass

文章通过对淡水芦苇、海水芦苇和互花米草的热解特性进行对比研究发现:互花米草的热解温度低于芦苇;互花米草炭和海水芦苇炭的比表面积大于淡水芦苇炭;互花米草炭和海水芦苇炭的灰分含量高,热值低;互花米草热解油的产率和热值均低于两种芦苇热解油,其中不含2~3环芳烃及其衍生物,单环芳烃及其衍生物的含量也较低。3种生物质热解气中的CO_(2)含量比较为“互花米草>海水芦苇>淡水芦苇”;与CO_(2)含量顺序相反,其CO_(2)和H的含量为“淡水芦苇>海水芦苇>互花米草”。以上3种生物质的热解特性差异由其“三组分”组成、无机盐含量及种类的差异所决定。

Pyrolysis characteristics of three typical aquatic biomass including Phragmites australis(reed) from freshwater/seawater and Sporobolus alterniflora were compared in this paper. The results showed that pyrolysis temperature required for Sporobolus alterniflora which had higher salt content was lower than those of the seawater/freshwater Phragmites australis;and that the specific surface areas of Sporobolus alterniflora and seawater Phragmites australis biochars were larger than that of freshwater Phragmites australis biochar. However, the former two had higher ash contents and lower calorific values. The yield and calorific value of Sporobolus alterniflora oil were lower than those of the two reed pyrolysis oils;and heavy compounds with 2-3 benzene rings were not detected in its pyrolysis oil. The ascending order of CO_(2)contents in the pyrolysis gases is Sporobolus alterniflora >seawater Phragmites australis > freshwater Phragmites australis;and the order of CO_(2) and Hcontents in the pyro lysis gases was opposite to that of the CO_(2)content. The differences in three components’ content and inorganic salts of the three typical aquatic biomass resulted in the differences in their pyrolysis ch arac teristics. These findings will help to achieve the efficient utilization of aquatic biomass resources.