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化工学报  2014 

中空纤维膜接触器脱碳和传质性能的数值研究

DOI: 10.3969/j.issn.0438-1157.2014.06.045, PP. 2285-2293

Keywords: 中空纤维膜接触器,二氧化碳,操作参数,模型,数值模拟

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Abstract:

中空纤维膜吸收烟气中CO2是一种清洁、高效、最具潜力的脱碳技术方法之一。本文建立了一个二维的中空纤维膜接触器平行逆流吸收混合气中CO2的非润湿模型。考虑轴向和径向扩散,模拟了EEA、EDA和PZ3种吸收剂在不同操作条件下对CO2的脱除效果和传质性能。结果表明:脱碳性能从大到小为PZ>EDA>EEA;气相参数对脱碳和传质的影响比液相参数更显著;提高气体流速、CO2浓度和气温,脱碳率均会下降;提高液速、吸收剂浓度和液温,脱碳率均增大,而传质速率只有在提高气温时会下降,其他参数的升高均会使其增大;应采用适当的液相参数,防止操作参数过高带来的不利影响。

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