摘要
利用小型固定床反应器,考察CaO对小球藻多糖热解三相产物分布的影响规律,利用气相色谱(GC)、X射线衍射(XRD)、红外光谱(FT-IR)、气相色谱/质谱联用(GC/MS)等测试手段,综合分析CaO与多糖混合热解脱氧的反应路径。结果表明,与多糖热解相比,25%CaO与75%多糖混合热解生物油有机相的含氧量降低7.32%,呋喃类产物明显减少:含氧气体产量整体下降,其中CO2降低14.87%:固体焦炭的含氧量增加23.11%。CaO与多糖混合热解脱氧主要存在2种反应路径:1)CaO可固定多糖热解过程的部分羰基(C==O)产物;2)生成Ca(OH)2来降低热解液相产物的含水率。
The effect of CaO on the distribution characteristics of three phases products from pyrolysis of Chlorella polysaccharide was studied by means of a small fixed-bed reactor. Reaction path of CaO deoxidation were analyzed comprehensively by GC,XRD,FT-IR and GC-MS. The results show that compared with the direct pyrolysis of Chlorella polysaccharide,the oxygen content of organic components decrease by 7.32% and the furan products reduce obviously;The release of CO_2 decreases by 14.87% and oxygen-containing gas yield overall decline;Furthermore,the oxygen content of solid coke increase by 23.11% when the mass ratio of CaO and polysaccharide was 1/3. FT-IR results indicate that there are two reaction paths in the deoxidation reaction of polysaccharides with CaO:one is to play an important role in the fixation of carbonyl(C==O)from pyrolysis of chlorella polysaccharide,and the other is to reduce the moisture of liquid products by generating Ca(OH)2.
引文
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