CO2 Absorption Characteristics in Ammonia Solution inside the Structured Packed Column

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• 作者：Fengming Chu ; Choljin Jon ; Lijun Yang ; Xiaoze Du ; Yongping Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：March 30, 2016
• 年：2016
• 卷：55
• 期：12
• 页码：3696-3709
• 全文大小：726K
• ISSN：1520-5045

文摘

Ammonia has proved an alternative and potential solvent for postcombustion CO₂ capture. It is of benefit to the reduction of energy consumption for CO₂ capture to clarify the CO₂ absorption characteristics in ammonia solution. On the basis of the representative elementary volume method and pseudo-single-liquid model, the computational model of CO₂ absorption into ammonia solution in the structured packed column of a pilot CCS plant was developed, in which the gas-phase flow was also taken into account. The modeling and computational methods were validated by comparing with the experimental data from two pilot CO₂ absorption towers. The CO₂ removal efficiency and volumetric overall mass transfer coefficient were obtained at various inlet CO₂ volume fractions, gas flow rates, aqueous ammonia solution flow rates and temperatures, and the ammonia mass fractions. The results show that the absorption process is predominated by the liquid film, so the flow rate and ammonia concentration of the aqueous ammonia solution play important roles in the mass transfer capacity of CO₂.