微藻微波催化裂解研究及动力学分析

采用微波设备对微藻粉末进行热解实验,分别研究了活性炭、H₃PO₄、NaOH、MgCl₂、MgO对微藻微波裂解的影响,以及不同功率(200、600、900 W)下微藻裂解失重的变化。结果表明,对于所研究的五种无机添加剂,均能够显著增加固体产物产率,明显减少气体产物产率,添加剂对液体产率的影响不是很显著,但H₃PO₄和MgCl₂使液体产率提高,NaOH使液体产率降低。微藻的微波裂解过程大致可以分成脱水、干燥、快速裂解和缓慢裂解四个阶段。采用Flynn-Wall-Ozawa法对微藻微波裂解进行动力学分析,计算出相应的微藻快速裂解阶段的活化能,活化能基本上随反应的进行而增大。

Catalytic cracking and kinetics analysis of microalgae by microwave

A series of experiments of microalgae pyrolysis using microwave were carried out.The influences of different additives such as activated carbon,H3PO4,NaOH,MgCl2,MgO on microalgae pyrolysis were examined.The weight loss during pyrolysis of microalgae with different microwave powers(200,600,and 900 W) were studied.The result shows that there are four stages in microalgae pyrolysis: dehydration,drying,rapid pyrolysis and slow pyrolysis.All the additives improve the yield of solid product significantly,but reduce the gaseous yield;and have no remarkable influence on the liquid yield.However,H3PO4 and MgCl2 raise the liquid yield,NaOH is opposite.The corresponding activation energy of microalgae rapid pyrolysis was obtained by Flynn-Wall-Ozawa method(FWO),and the value generally increases with the deepening of the reaction.