二氧化碳捕集论文蜂窝状活性炭吸附CO2及电解吸过程的研究.doc

二氧化碳捕集论文：蜂窝状活性炭吸附CO2及电解吸过程的研究 【中文摘要】随着哥本哈根会议的召开与京都议定书的生效,特别是近期南非德班气候大会的顺利闭幕,国际CO2减排形势日益严峻,减缓温室效应、对CO2实施减排已经刻不容缓。本文拟采用低压降蜂窝状活性炭吸附捕集烟道气中的CO2,并利用蜂窝状活性炭良好的导电导热性能,研发先进的电解吸技术,取代传统的真空解吸工艺。估算捕集CO2过程的能耗,为蜂窝状活性炭吸附捕集温室气体CO2的工业应用提供基础依据。蜂窝状活性炭不仅具有比表面积高、孔隙结构可控的优点,还具有开孔率高、压降低、吸脱附速率快、机械强度高、不易堵塞等优点,因此被认为是捕集烟道气中C02重要吸附剂。本文选用商业可得到的蜂窝状煤基活性炭和蜂窝状椰壳活性炭吸附捕集烟道气中CO2,并采用K2CO3溶液浸渍蜂窝状活性炭,提高吸附烟道气中低浓度C02的容量和增加CO2/N2的选择性。利用磁悬浮天平测定了K2CO3溶液浸渍前后蜂窝状活性炭吸附C02和N2的平衡等温线；采用Langmuir、Multi-site Langmuir和Virial模型对CO2和N2的吸附平衡实验数据进行拟合；比较了K2CO3溶液浸渍前后蜂窝状活性炭吸附CO2容量、CO2/N2选择性以及吸附热,为吸附工艺的优化设计提供基础数据。优化设计蜂窝状活性炭填充床,解决吸附剂与吸附器的良好匹配,提高电加热时能量的利用率。建立了蜂窝状活性炭导电导热性能测试装置,实验测量电加热时吸附器内蜂窝状活性炭的电流、电阻变化曲线及温升曲线,计算电加热每公斤吸附材料需要的能耗,讨论电能的有效利用率。实验研究蜂窝状活性炭吸附捕集烟道气中CO2及其电解吸过程,研究捕集CO2的操作条件,如进气C02浓度、解吸温度、解吸时间、吹扫气速等对烟道气C02回收率、产品气CO2纯度、吸附剂再生率以及过程能耗的影响。核算捕集每公斤CO2所需要的能耗,探讨电解吸工艺可行性。总之,研发新型的、导电导热性能良好的、高效CO2吸附材料；解决吸附剂与吸附器的良好匹配,提高电加热时能量的利用率；优化CO2吸附及电解吸过程,降低捕集烟道气中CO2成本及能耗,将使电解吸工艺在CO2吸附捕集技术中发挥显著的优势。 【英文???要】With Copenhagen conference, Kyoto Protocol and Durban climate conference, the greenhouse effect which caused great environmental problems has become one of the most important issues in the world. The massive emission of CO2 during the combustion of fossil fuels was considered as the important contribution. So the effective measures must be taken to reduce the emission of CO2 from the flue gas. In this paper, activated carbon (AC) monoliths were used as adsorbents to capture CO2 from the flue gas. Based on the good electrothermal behavior of AC monolith, the electrothermal desorption process for the adsorbent regeneration was developed, instead of the traditional vacuum desorption process. The feasibility and efficiency of the process for CO2 capture by AC monolith adsorption with the electrothermal desorption were evaluated.AC monolith had the advantages of high specific surface area, controllable pore structure, high adsorption and desorption rates, low pressure drop as well as excellent