添加CaO影响生物质流化床高温热解特性的实验研究

EXPERIMENTAL RESEARCH ON EFFECT OF CALCIUM OXIDE ON BIOMASS HIGH-TEMPERATURE PYROLYSIS IN FLUIDIZED BED

为了研究CaO对生物质高温热解特性的影响,采用小型流化床反应器,在700~850℃下进行CaO质量分数分别为0、5%、10%和20%的木薯秆热解实验,并且分别利用傅氏转换红外线光谱(FTIR)和气相色谱-质谱(GC-MS)分析半焦表面官能团和焦油成分。结果表明:CaO会固定半焦中的含氧官能团,从而增加半焦产率;同时,CaO还可降低焦油产率,脱除焦油中的含氧官能团,促进焦油的缩聚反应。另外,CaO可明显提高H2产率,降低CO2、CO的产率,改善热解气的品质。

In order to investigate the effect of calcium oxide on biomass high-temperature pyrolysis characteristics,cassava straw high-temperature pyrolysis experiments with different amount(0,5%,10%,20%)of calcium oxide were carried out in a fluidized bed,under the temperature range from 700 ℃ to 850 ℃. FTIR was used to analyze the functional groups of char, and the components of tar was analyzed by GC-MS. The results show that calcium oxide can fix a few oxygencontaining functional groups in the char,thus increased the char yield. At the same time,the yield of tar was decreased with the addition of calcium oxide,it may conclude that calcium oxide can reduce the amount of oxygen-containing functional groups in the tar,promoting the condensation polymerization reaction. The addition of calcium oxide can apparently raise the yield of H2,reduce the yield of CO2 and CO,and improve the quality of pyrolysis gas.