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Analysis of energetics and economics of sub-ambient hybrid post-combustion carbon dioxide capture
AIChE Journal ( IF 3.7 ) Pub Date : 2021-08-17 , DOI: 10.1002/aic.17403 Stephen J. A. DeWitt 1 , Rohan Awati 1 , Héctor Octavio Rubiera Landa 1 , Jongwoo Park 1 , Yoshiaki Kawajiri 1 , David S. Sholl 1 , Matthew J. Realff 1 , Ryan P. Lively 1
AIChE Journal ( IF 3.7 ) Pub Date : 2021-08-17 , DOI: 10.1002/aic.17403 Stephen J. A. DeWitt 1 , Rohan Awati 1 , Héctor Octavio Rubiera Landa 1 , Jongwoo Park 1 , Yoshiaki Kawajiri 1 , David S. Sholl 1 , Matthew J. Realff 1 , Ryan P. Lively 1
Affiliation
Adsorption of CO2 from post-combustion flue gas is one of the leading candidates for globally impactful carbon capture systems. This work focused on understanding the opportunities and limitations of sub-ambient CO2 capture processes utilizing a multistage separation process. A hybrid process design using a combination of pressure-driven separation of CO2 from flue gas (e.g., adsorption- or membrane-based separation) followed by CO2-rich product liquefaction to produce high-purity (>99%) CO2 at pipeline conditions is considered. The operating pressure of the separation unit is a key cost parameter and also an important process variable that regulates the available heat removal necessary to reach the sub-ambient operating conditions. The economic viability of applying pressure swing adsorption (PSA) processes using fiber sorbent contactors with internal heat management was found to be most influenced by the productivity of the adsorption system, with productivities as high as 0.015 /kgsorb−1 sec−1 being required to reduce costs of capture below $60/ton CO2 captured. This analysis was carried out using a simplified two-bed process, and thus there is opportunity for further cost reduction with exploration of more complex cycle designs. Three exemplar fiber sorbents (MIL-101(Cr), UiO-66, and zeolite 13X) were considered for application in the sub-ambient process of PSA unit. Among the considered sorbents, zeolite 13X fiber composites were found to perform better at ambient temperatures as compared to sub-ambient. MIL-101(Cr) and UiO-66 fiber composites had improved purity, recovery, and productivity at colder temperatures reducing costs of capture as low as $61/ton CO2. Future economic improvement could be achieved by reducing the required operating pressure of the PSA unit and pushing the Pareto frontier closer to the final pipeline requirement via a combination of PSA cycle design and material selection.
中文翻译:
亚环境混合燃烧后二氧化碳捕获的能量学和经济学分析
从燃烧后烟道气中吸附 CO 2是具有全球影响力的碳捕获系统的主要候选者之一。这项工作的重点是了解利用多级分离过程的亚环境 CO 2捕获过程的机会和局限性。混合工艺设计,结合压力驱动从烟道气中分离 CO 2(例如,基于吸附或基于膜的分离),然后将富含CO 2 的产品液化以生产高纯度 (> 99%) CO 2考虑管道条件。分离单元的操作压力是一个关键的成本参数,也是一个重要的过程变量,它调节达到低于环境操作条件所需的可用热量去除。使用具有内部热管理纤维吸附剂接触器施加压力摆动吸附(PSA)工艺的经济可行性,发现由吸附系统的生产率影响最大,具有生产率高达0.015 / kg的吸着-1秒-1被要求将捕集成本降低至 60 美元/吨 CO 2 以下捕获。该分析是使用简化的两床工艺进行的,因此有机会通过探索更复杂的循环设计来进一步降低成本。三种示例性纤维吸附剂(MIL-101(Cr)、UiO-66 和沸石 13X)被考虑用于 PSA 装置的低温工艺。在考虑的吸附剂中,发现沸石 13X 纤维复合材料在环境温度下的性能比低于环境温度的性能更好。MIL-101(Cr) 和 UiO-66 纤维复合材料在较冷的温度下提高了纯度、回收率和生产率,将捕获成本降低至 61 美元/吨 CO 2. 未来的经济改善可以通过降低 PSA 装置所需的运行压力,并通过 PSA 循环设计和材料选择的结合,使帕累托边界更接近最终管道要求,从而实现经济改善。
更新日期:2021-10-09
中文翻译:
亚环境混合燃烧后二氧化碳捕获的能量学和经济学分析
从燃烧后烟道气中吸附 CO 2是具有全球影响力的碳捕获系统的主要候选者之一。这项工作的重点是了解利用多级分离过程的亚环境 CO 2捕获过程的机会和局限性。混合工艺设计,结合压力驱动从烟道气中分离 CO 2(例如,基于吸附或基于膜的分离),然后将富含CO 2 的产品液化以生产高纯度 (> 99%) CO 2考虑管道条件。分离单元的操作压力是一个关键的成本参数,也是一个重要的过程变量,它调节达到低于环境操作条件所需的可用热量去除。使用具有内部热管理纤维吸附剂接触器施加压力摆动吸附(PSA)工艺的经济可行性,发现由吸附系统的生产率影响最大,具有生产率高达0.015 / kg的吸着-1秒-1被要求将捕集成本降低至 60 美元/吨 CO 2 以下捕获。该分析是使用简化的两床工艺进行的,因此有机会通过探索更复杂的循环设计来进一步降低成本。三种示例性纤维吸附剂(MIL-101(Cr)、UiO-66 和沸石 13X)被考虑用于 PSA 装置的低温工艺。在考虑的吸附剂中,发现沸石 13X 纤维复合材料在环境温度下的性能比低于环境温度的性能更好。MIL-101(Cr) 和 UiO-66 纤维复合材料在较冷的温度下提高了纯度、回收率和生产率,将捕获成本降低至 61 美元/吨 CO 2. 未来的经济改善可以通过降低 PSA 装置所需的运行压力,并通过 PSA 循环设计和材料选择的结合,使帕累托边界更接近最终管道要求,从而实现经济改善。