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首页> 外文期刊>International Journal of Chemistry and Chemical Engineering >Carbon Dioxide Scrubbing by Chemical and Electrochemical Method
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Carbon Dioxide Scrubbing by Chemical and Electrochemical Method

机译：通过化学和电化学方法擦洗二氧化碳

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The main greenhouse gas contributing towards the global warming phenomena is Carbon dioxide (CO2), the level of which in the atmosphere is steadily increasing in manifold over the years. Carbon dioxide is a pollutant, as hazardous as sewage or radioactive waste. Carbon sequestering, carbon capture and trade, carbon tax are some of the policies that governments have implemented around the world, to limit the carbon footprint. Nonetheless, the atmospheric level of CO2 is ever increasing. New technologies have the potential to provide a cost-effective mitigation option to limit greenhouse gas level. I here study about the cheap and energy efficient ways to scrub the atmospheric CO2 by combining chemical and electrochemical methods. Sodium Hydroxide (NaOH) is chosen because in addition to being inexpensive, abundant and non-hazardous, it has lower vapor pressure to prevent water loss, it can contain higher concentrations of hydroxide for more efficient contacting systems and can be easily recycled back in the electrochemical method. In the first stage of chemical scrubbing, bubble column apparatus and packed column apparatus have been found to effectively able to scrub 83.9% and 86.8% of the inlet carbon dioxide gas. Also parameters like concentration of the NaOH solution, Height to Diameter ratio (H/D), gas velocity were varied over a wide range of values and their effect on gas holdup, saturation point were studied. The change of slope in gas holdup versus gas velocity indicates the transition point from homogeneous to heterogeneous regime occurred in the range of 0.6-0.9ms~(-1). An electrochemical method to regenerate the used scrubbing solution and release carbon dioxide yielded a carbon dioxide gas recovery efficiency of 69-73 %. The minimum power consumption within the operation conditions studied in this work was found to be 0.895 kW.h/kg-CO2 which was achieved at the current density of 2mA/cm~2.'
机译：主要的温室气体导致全球变暖现象是二氧化碳（二氧化碳），多年来，在大气中的水平在歧管中稳步增加。二氧化碳是一种污染物，与污水或放射性废物一样危险。碳封存，碳捕获和贸易，碳税是各国政府在世界各地实施的一些政策，以限制碳足迹。尽管如此，CO2的大气水平越来越多。新技术有可能提供具有限制温室气体水平的经济有效的缓解选择。我在这里通过结合化学和电化学方法来研究廉价和节能的方式来擦洗大气二氧化碳。选择氢氧化钠（NaOH），因为除了廉价，丰富和无危险的外，它还具有较低的蒸气压，以防止水分损失，可含有更高浓度的氢氧化物用于更有效的接触系统，并且可以容易地回收电化学方法。在化学擦洗的第一阶段，已经发现泡柱装置和填充柱装置有效地能够擦洗83.9％和86.8％的入口二氧化碳气体。还可以参数，如NaOH溶液的浓度，高度为直径比（H / D），气体速度在各种值范围内变化，研究了对气体储存的影响，研究了饱和点。气体堆叠中的斜率变化与气体速度表示从均匀到异质状态的过渡点发生在0.6-0.9ms〜（-1）的范围内。再生使用的洗涤溶液和剥离二氧化碳的电化学方法产生二氧化碳气体回收效率为69-73％。在该工作中研究的操作条件内的最小功耗被发现为0.895 kW.h / kg-co2，其在电流密度为2mA / cm〜2。

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