摘要
为了提高填料塔的传质性能,对比研究新型CO_(2)吸收剂,在CY-700型不锈钢规整填料中试吸收和解吸塔内,研究了不同操作条件下乙醇胺(MEA)水溶液吸收CO_(2)的总体积传质系数K Ga v和捕集率,并对连续捕集CO_(2)工艺的再生能耗进行了分析。结果表明,K Ga v随液体流量的增大而增大,随溶液CO_(2)负载和CO_(2)分压的增大而减小,但是气体流量的增加对K Ga v有不利影响;中试连续循环运行结果表明,液气比和塔顶溶剂回流量对体系操作循环负载和再生能耗均有较大影响,在目标CO_(2)吸收率≥90%、吸收剂流量为5 L/h、气体流量为0.48 m 3/h的操作条件下,捕集CO_(2)再生能耗约为8.5 MJ/kg,循环负载约为0.67 mol/kg。研究结果验证了装置运行的稳定性和可重复性,CY-700填料塔的传质性能较好,为下一阶段探索新型贫水有机胺吸收剂捕集CO_(2)的性能提供重要的对比参考数据。
In order to improve the mass transfer performance of packed column and investigate comparatively different absorbents,a monoethanolamine(MEA)-based lab pilot plant with CO_(2)absorption and desorption packed columns with CY-700 structured packings was built.The volumetric mass transfer coefficient(K Ga v)and CO_(2)capture rate of monoethanolamine(MEA)aqueous solution absorbing CO_(2)under different operating conditiions were investigated,and the regeneration energy consumption was also evaluated.The results show that K Ga v increases with the increasing liquid flow rate and decreases with the increase of lean CO_(2)loading and CO_(2)partial pressure.However,the increasing gas flow rate has negative effect on K Ga v.Liquid-to-gas ratios and reflux rate of condensate back to the desorber have significant effect on the working cyclic capacity and regeneration energy.Specifically,under the conditions with CO_(2)capture rate≥90%,5 L/h liquid flow rate and 0.48 m 3/h gas flow rate,the regeneration energy and the cyclic capacity were about 8.5 MJ/kg CO_(2)and 0.67 mol/kg respectively.The findings verify the stability and repeatability of the CO_(2)capture pilot plant,and the good mass transfer performance of CY-700 packing,which also provide important comparative reference data of the baseline solvent for comparison with novel water-lean amine-based absorbents in the next step of work.
作者
崔广毅
申淑锋
CUI Guangyi;SHEN Shufeng(School of Chemical and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang Hebei 050018,China)
出处
《河北科技大学学报》
CAS
北大核心
2023年第4期374-383,共10页
Journal of Hebei University of Science and Technology
基金
河北省硕士在读研究生创新能力培养资助项目(CXZZSS2023094)
河北省科技厅重点研发计划(21373703D)。
关键词
吸收
CO_(2)捕集
填料塔
乙醇胺
传质性能
再生能耗
absorption
CO_(2)capture
packed column
monoethanolamine
mass transfer performance
regeneration energy consumption
作者简介
第一作者:崔广毅(1999-),男,福建南平人,硕士研究生,主要从事化学吸收法捕集CO_(2)方面的研究;通信作者:申淑锋,教授。E-mail:sfshen@hebust.edu.cn。
