温度对水葫芦热解特性的影响

Effects of temperature on pyrolysis characteristics of water hyacinth

水葫芦是一种水体污染物,其蕴藏着大量的能量。为了使水葫芦变废为宝,解决环境污染的同时,提供一定的能源补给,在热重分析的基础上,采用固定床,借助GC、GC-MS、XRD和SEM等技术手段,研究不同热解温度段水葫芦热解后的气、液、固三相产物的特性。结果表明,低温热解温度段275～375℃生成的生物油不仅产率增加较大,而且生物油酸类较少、酯类较多,热值较高,品质明显优于高温热解温度段450～550℃生成的生物油;但高温热解温度段450～550℃下,明显有利于气体产物中高热值气体H2和CO的生成,生物质炭的结构孔径较大,晶体相态更加稳固,可见热解温度对三相产物的影响很大。

Water hyacinth is a pollutant for the water body and contains a large amount of energy.In order to solve environmental pollution and at the same time provide a certain energy supply,in this paper based on thermogravimetric analysis,the characteristics of gas,liquid and solid products produced from the fixed bed pyrolysis of water hyacinth at different temperature were investigated by GC,GC-MS,XRD and SEM techniques.The results showed that compared with the bio-oil produced at 450—550 ℃ not only the increase of bio-oil at 275—375 ℃ was bigger but also the quality of bio-oil with less acid,more esters and higher calorific value was better;while at 450—550 ℃,it was apparently beneficial for the production of high calorific value gas such as H2 and CO,the aperture of biomass carbon was larger and the crystal structure was more stable.So it is obvious that the pyrolysis temperature has a big effect on the three phase products.