利用碳酸钾溶液提高振荡障板塔去除烟气中二氧化碳的能力

IF 5.3 Q2 ENGINEERING, ENVIRONMENTAL Cleaner Engineering and Technology Pub Date : 2024-09-28 DOI:10.1016/j.clet.2024.100815
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引用次数: 0

摘要

利用碱溶液吸收二氧化碳是减少炼油厂和发电厂烟道气中二氧化碳排放的有效方法之一。碳酸钾(K2CO3)溶液作为二氧化碳吸收剂,因其具有较高的二氧化碳吸收能力而被用于本研究。然而,K2CO3 有一个缺点,即与 CO2 的反应速度较慢。为了克服这一问题,我们使用了振荡褶流柱(OBC)作为接触器,以保持二氧化碳吸收系统中的高度混合,从而提高 K2CO3 和二氧化碳之间的反应速度,并增强传质速度。本研究探讨了不同的工艺操作条件(即入口烟气流速(15 % (v/v) CO2 与 N2 平衡)和振荡条件)对半间歇式 OBC 中 CO2 吸收的影响。实验在修正的振荡雷诺数(Reo′ = 0⎼1450)和曝气速率(0⎼1 vvm)范围内进行,使用 K2CO3 (100 g/L, 0.72 M)0.1.8-3.与障板柱(BC)(只有障板没有振荡)和平面气泡柱(PBC)(没有障板和振荡)相比,使用 OBC 所获得的二氧化碳吸收率分别提高了 5 倍。在振荡反应器(OBR)中使用 K₂CO₃ 作为溶剂来去除 CO₂ 是一种新方法,因为 K₂CO₃ 与 CO₂ 具有很高的反应活性,可形成稳定的碳酸氢盐和碳酸盐化合物。与传统反应器相比,OBR 增强的混合能力可提高传质速率和反应效率,从而更有效地捕获二氧化碳。这种组合充分利用了 K₂CO₃ 的化学反应性和 OBR 的机械优势,有可能带来更高效、更可扩展的二氧化碳去除工艺。
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Enhancement of CO2 removal from flue gas in an oscillatory baffled column using potassium carbonate solution
One of the efficient methods for reducing CO2 emissions from flue gas streams in oil refineries and power plants is the CO2absorption process using alkali solution. Potassium carbonate (K2CO3) solution, as CO2 absorbent, was used in the present study due to its high CO2 absorption capacity. However, K2CO3 has a drawback which is represented by its slow reaction with CO2. To overcome this issue, an oscillatory baffled column (OBC) was utilized as a contactor to maintain a high degree of mixing in the CO2 absorption system and thereby increasing the reaction rate between K2CO3 and CO2 as well as enhancing the mass transfer rate. In this study the effect of different operation conditions of the process namely; inlet flue gas flow rate (15 % (v/v) CO2 balanced with N2) and oscillation conditions on CO2 absorption in a semi-batch OBC were investigated. The experiments were performed with range of modified Reynolds Number of Oscillation (Reo = 0⎼1450) and aeration rates (0⎼1 vvm) using K2CO3 (100 g/L, 0.72 M)0.1.8–3.5-fold of enhancement of CO2 absorption rates was achieved by using OBC with respect to that obtained by baffled column (BC) (only baffles without oscillation) and plane bubble column (PBC) (without baffles and oscillation), respectively.
The use of K₂CO₃ as a solvent in an oscillating reactor (OBR) to remove CO₂ represents a new method due to the high reactivity of K₂CO₃ with CO₂, forming stable bicarbonate and carbonate compounds. OBR's enhanced mixing capabilities improve mass transfer rates and reaction efficiency, allowing for more effective CO2 capture compared to conventional reactors. This combination leverages the strengths of both the chemical reactivity of K₂CO₃ and the mechanical benefits of OBR, potentially leading to more efficient and scalable CO2 removal processes.
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来源期刊
Cleaner Engineering and Technology
Cleaner Engineering and Technology Engineering-Engineering (miscellaneous)
CiteScore
9.80
自引率
0.00%
发文量
218
审稿时长
21 weeks
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