工業革命以來，人類大量使用石化燃料，使得二氧化碳氣體排放劇增，造成全球暖化與氣候變遷。因此，在1997年《京都議定書》之後，「減碳」的議題逐漸受到各國政府及企業的重視，進而衍生出許多關於減碳的技術。而如何將二氧化碳以更有效率的方式吸收，並將捕碳後的產物，以更有效益的方式再利用，將是目前需要改善的課題。
本研究將以強鹼溶液為吸收劑，並結合超重力系統來作為吸收二氧化碳的程序，來解決二氧化碳溶解度低、吸收效率不佳的問題，並將吸收後的產物，碳酸鹽、碳酸氫鹽，提供為微藻的養分來源。主要研究以鹼液的二階段碳酸化來計算並分析二氧化碳的捕獲效率、吸收程序的總質傳係數等指標，來評估包括轉速、進料氣液比、吸收劑等參數的優劣，並將最適化的參數進行實質減碳分析與經濟效益的評估。
由實驗結果顯示，轉速為1000 rpm、進料氣液比32時，為本研究所使用的超重力系統之最佳操作參數，並進一步測試廢鹼液為吸收劑之可行性。總體而言，以碳酸鉀作為終端產物之吸收程序的負碳量最高，二氧化碳的捕獲率達78.9%，總質傳係數為0.47s-1，年負碳量可達56.3噸；而以1M氫氧化鉀作為吸收劑，二氧化碳的捕獲效率最高為78.9%，總質傳係數為0.47s-1，以碳酸氫鉀作為終端產物之吸收程序的淨利最高，年淨利可達57萬元。本系統已於實廠進行鍋爐尾氣的吸收實驗與微藻培養驗證，初步確定商業化之可行性。

Since the Industrial Revolution, the extensive use of fossil fuels by humans has led to a significant increase in carbon dioxide (CO2) emissions, resulting in global warming and climate change. As a response, the issue of "carbon reduction" has gained attention from governments and businesses worldwide since the Kyoto Protocol in 1997. This has given rise to various carbon reduction technologies aimed at efficiently capturing CO2 and effectively utilizing the captured carbon products. However, challenges remain in improving the efficiency of CO2 absorption and finding beneficial ways to reuse the captured carbon products.
To address these challenges, this research focuses on using a strong alkaline solution as an absorbent and combining it with a Higee system for CO2 absorption. By leveraging the advantages of the rotating packed bed, such as enhanced mass transfer, the aim is to overcome the limitations of low CO2 solubility and inefficient absorption. The captured carbon products, such as carbonates and bicarbonates, can be repurposed as a nutrient source for microalgae, providing a potential avenue for beneficial utilization.
The study primarily focuses on analyzing the two-stage carbonation process of the alkaline solution to calculate key indicators such as CO2 capture efficiency and the overall mass transfer coefficient. Parameters including rotational speed, gas-liquid feed ratio, and absorbent properties are evaluated to determine their impact on system performance. Optimization of these parameters is conducted to achieve substantial carbon reduction and assess the economic benefits associated with the optimized conditions.
The research findings indicate that a rotational speed of 1000 rpm and a gas-liquid feed ratio of 32 are identified as the optimal operational parameters for the rotating packed bed. Additionally, the feasibility of utilizing waste alkaline solution as the absorbent is tested. This study reveals that the absorption process with potassium carbonate as the end product demonstrates the highest negative carbon value, CO2 capture rate of 78.9%, and a total mass transfer coefficient of 0.47 s-1. Another notable finding is that using 1 M potassium hydroxide as the absorbent yields a CO2 capture efficiency of 78.9% and a total mass transfer coefficient of 0.47 s-1. The absorption process with potassium bicarbonate as the end product exhibits the highest net profit, with an annual net profit of 570,000 NTD. Furthermore, the system has been successfully tested for flue gas absorption and microalgae cultivation in an industrial setting, providing preliminary evidence of its commercial feasibility.
In conclusion, this research aims to address the challenges of CO2 absorption and utilization by employing a strong alkaline solution and a rotating packed bed. The findings demonstrate the potential of the proposed approach in terms of CO2 capture efficiency and the utilization of captured carbon products. The successful implementation of the system in an industrial setting supports its commercial viability. Further research and development are needed to optimize and scale up the system for broader deployment while considering factors such as cost-effectiveness, environmental impact, and long-term sustainability.

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