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蒸汽活化生物质焦吸附模拟烟气中so2和no的研究

, PP. 627-635

Keywords: 生物质焦,蒸汽活化,吸附特性,so2,no

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Abstract:

?以麦秆和稻壳生物质为研究对象,在不同的热解温度、热解速率以及蒸汽活化温度条件下制备了生物质焦,采用比表面积与孔隙度分析仪测定生物质焦的比表面积和孔隙结构参数。利用固定床吸附装置,研究了热解温度、热解速率、活化温度和模拟烟气中so2和no浓度等因素对生物质焦吸附so2和no性能的影响。结果表明,蒸汽活化可以显著提高生物质焦的bet比表面积、d-r比表面积、d-r微孔容积和总孔容,降低其平均孔径,并显著增加蒸汽活化生物质焦对so2与no吸附的起始穿透时间和吸附量。快速热解下制得的蒸汽活化焦对so2和no的吸附效果优于慢速热解,热解温度为873k的蒸汽活化焦的吸附性能明显好于热解温度为673与1073k的蒸汽活化焦。在973~1173k下,随着蒸汽活化温度的提高,蒸汽活化生物质焦对so2和no的吸附量呈现先上升后下降的趋势。随着模拟烟气中so2与no浓度的降低,蒸汽活化生物质焦对so2与no吸附的起始穿透时间延长,但相应的so2和no吸附量下降。在873k、快速热解和1073k条件下制得的蒸汽活化麦秆焦对so2和no吸附量最大,其值分别为109.02和21.77mg/g。

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