Combined mass-transfer and energy-flux studies for Absorption-based CO2 capture process

基于吸收的二氧化碳捕获过程的传质和能量通量联合研究

• 批准号: 261685-2008
• 负责人: Aroonwilas, Adisorn
• 金额: $ 1.46万
• 依托单位: University of Regina
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=456060
• 关键词: Combined; mass; transfer; energy; flux

Capturing carbon dioxide (CO2) from industrial flue gas streams has been considered as one of the key strategies for mitigation of greenhouse gas emissions in Canada and the world. At present, gas absorption into an aqueous alkanolamine solution is the most reliable mitigation technique that bears no technical risk for CO2 capture. However, the current commercial technology is yet associated with high capital and operating cost. The CO2 capture cost can be reduced by enhancing absorption & regeneration performance of alkanolamines used and also by improving column design or configuration of the process. Use of energy-efficient alkanolamines could result in a significant reduction in energy requirement for the process, thereby reducing operating cost. It however leads to an increase in capital cost of the entire capture process. Therefore, it is important that performance of absorption and regeneration columns must also be improved if the overall capture cost is to be reduced. The objectives of this proposed research are: 1) to determine mass-transfer performance and hydrodynamic behavior of various columns fitted with structured packings and also spray nozzles under CO2 absorption and solvent regeneration conditions, 2) to measure energy-flux components taking part in CO2 absorption and regeneration phenomena, 3) to develop a theoretical rate-based model that integrates mass-transfer performance, energy-flux components and hydrodynamic behavior of the columns, and 4) to perform an optimization study to arrive at the optimal design of column internals for CO2 capture application. This research is important because it will lead to significant savings in not only the capital expenditure but also the operating cost of CO2 capture. The research outcomes will present Canada with a great opportunity for reducing its CO2 emissions in a timely manner without posing a burden on the growing economy.

从工业烟道气流中捕获二氧化碳（CO2）已被认为是加拿大和世界上减缓温室气体排放的关键战略之一。 目前，将气体吸收到烷醇胺水溶液中是最可靠的缓解技术，对CO2捕集没有技术风险。 然而，目前的商业技术仍然与高资本和操作成本相关联。可以通过提高所用烷醇胺的吸收和再生性能以及通过改进工艺的塔设计或配置来降低CO2捕集成本。使用节能的链烷醇胺可以导致该方法的能量需求显著降低，从而降低操作成本。然而，这导致整个捕获过程的资本成本增加。因此，重要的是，如果要降低总的捕获成本，吸收和再生塔的性能也必须提高。这项拟议研究的目标是：1）确定在CO2吸收和溶剂再生条件下装配有规整填料以及喷嘴的各种塔的传质性能和流体动力学行为，2）测量参与CO2吸收和再生现象的能量通量分量，3）开发整合传质性能的基于速率的理论模型，能量通量组件和柱的流体动力学行为，以及4）进行优化研究以达到用于CO2捕集应用的柱内部构件的最佳设计。这项研究很重要，因为它不仅可以节省资本支出，还可以节省二氧化碳捕获的运营成本。研究结果将为加拿大提供一个及时减少二氧化碳排放量的大好机会，而不会对不断增长的经济造成负担。