发布时间：2024-12-16

文章标题：本组毛元豪博士生一作论文有关碳捕集加压一体化技术研究，最新发表在Energy Conversion and Management

内容：

Energy Conversion and Management

Volume 325, 1 February 2025, 119377

Theoretical and experimental validation of an electrochemical-mediated integrated system for CO₂ capture and compression

Yuanhao Mao, Huifeng Fan, Sayd Sultan, Yunsong Yu, Zaoxiao Zhang*, Xiaomei Wu*

 

Highlights

• An electrochemical-mediated integrated system for CO₂ capture and compression is proposed.

• The thermodynamic model shows the low-energy consumption property of the system.

• Experimental results prove the stability and effectiveness of the proposed system.

• The system performance remains nearly constant with a 40% increase in pressure.

 

Abstract

The carbon dioxide capture and compression processes represent the most energy-intensive stages in the carbon capture and storage (CCS) process, which are usually treated independently in the existing studies. Integrating the CO₂ capture and compression stages is a possible way to effectively reduce the compressor size and the total energy consumption of the CCS process. The recent development of electrochemically mediated amine regeneration (EMAR) technology provides a promising approach for this integration due to the strong driving force of the electrochemical reaction and the copper–amine complexation reaction. In this paper, we propose an electrochemical-mediated integrated system for CO₂ capture and compression and verify its pressurized operation performance both theoretically and experimentally. A thermodynamic model was developed to analyze the energy performance of the system and a bench-scale flow-cell system was designed to verify its ability to output CO₂ under pressurized conditions. The thermodynamic modelling results indicated that the energy consumption of the integrated system is significantly affected by different operational paths. At lower pressures, CO₂ bubbles are easier to form and the system tends to operate in 3-steps, higher pressures lead the system to function in 4-steps. Furthermore, the total energy consumption of the CCS process can be reduced by releasing CO₂ at a suitable pressure. The results of the bench-scale flow system indicated that a 40% increase in release pressure resulted in a nearly constant driving voltage and released CO₂ amount, thereby demonstrating its capacity to release pressurized CO₂. In conclusion, the results demonstrate the feasibility of the electrochemical-mediated integrated system, which provide an innovative low-energy pathway to support the achievement of global carbon neutrality.

 

Keywords

CO₂ capture

Electrochemically mediated amine regeneration (EMAR)

Thermodynamic model

Integrated system

Energy consumption

 

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摘要

二氧化碳（CO₂）捕集与压缩步骤作为碳捕集与封存（CCS）技术中能量密集程度最高的阶段，目前通常将其分开单独研究。将CO₂捕集与压缩过程进行耦合是降低系统总尺寸和CCS过程总能耗的潜在方案。由于电化学反应和Cu胺配合反应具有强大的推动力，近年来兴起的电化学介导胺再生（EMAR）碳捕集技术为整合捕集和压缩阶段提供了新的途径。本文提出了一种电化学介导的CO₂捕集和压缩一体化系统，并从理论和实验上验证了系统加压运行能力。通过热力学模型分析系统的能耗表现，并在实验室搭建流动电解池系统验证其在加压下释放CO₂的能力。热力学计算结果表明不同运行路径对集成系统能耗表现具有显著影响。在较低的压力下，CO₂气泡较易形成，系统倾向于三步运行模式，升高温度将使系统趋向于四步操作。此外，适宜的释放压力会降低使用该集成系统的CCS过程总能耗。流动电解池实验结果表明，当CO₂释放压力增加40%时，电池电压和CO₂解吸量几乎保持不变，表明该系统释放加压CO₂的能力。本研究结果初步证明了通过电化学介导实现捕集加压的集成系统的可行性，为实现高效碳捕集利用提供了一种新型低能量途径。