Abstract: By far, the emission of CO₂ has become a key challenge for the sustainable development in the world.Amongst the CO₂ capture techniques, post-combustion decarbonization, which bases on the mature state of art of chemical solvent absorption process, is currently the only one that has access to the industrial test.And aqua ammonia, as a new, alternative absorbent, has attracted much attention in recent years.In this study, the gas phase volumetric overall mass transfer coefficients of dilute CO₂ absorption into aqueous ammonia（K_Ga_e)were measured to explore the mass-transfer performance in a structured packed column.The K_Ga_e value was evaluated over the ranges of main operating variables：gas flow rate, CO₂ partial pressure, liquid loading, and ammonia concentration.The results show that higher liquid loading of aqueous ammonia is beneficial to enhance the K_Ga_e value.On the contrary, K_Ga_e decreases as the CO₂ partial pressure increases.Gas loading has little influence on K_Ga_e.The experimental results are useful to guide the future work on the packed column design.

Key words: aqua ammonia, carbon dioxide, absorption, structured packing, volumetric overall mass transfer coefficient

摘要： 目前，CO₂排放问题已经成为世界各国可持续发展面临的重要挑战。以化学溶剂吸收法工艺为基础的燃烧后脱碳是当前比较成熟的已进入工业规模实验的技术路线。而氨水作为一种新的吸收剂受到广泛关注。以气相体积传质系数（K_Ga_e）作为表征，对规整填料塔中氨水吸收CO₂的传质性能进行了研究，探索了气速、CO₂分压、液速和氨水浓度对K_Ga_e的影响。实验结果表明，在本文的工况条件下，K_Ga_e随液速和氨水浓度的增大而增大，随CO₂分压的增大有所减小，气速对K_Ga_e的影响不大。实验结果对今后填料塔的设计工作的经济性和合理性有一定指导作用。

关键词: 氨水, 二氧化碳, 吸收, 规整填料, 体积总传质系数