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CO2的吸收和捕集对于减缓温室效应和利用CO2创造经济效益具有重要的社会和经济价值。介绍了在鼓泡反应器中进行的CO2的吸收和捕集的研究进展,包括新型吸收剂的应用、反应原理的探讨、反应条件和工艺路线的优化等。这些研究为实现CO2的减排,开发新型高效吸收剂提供了参考。 相似文献
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综述了目前正在研究的各种二氧化碳分离技术。根据分离技术原理的不同,对吸收法、吸附法及膜分离法等技术进行了分类讨论。对于吸收法根据吸收剂的使用温度分为高温吸收剂和低温吸收剂进行了分类综述;根据使用材料的不同对吸附剂做了详尽的评述;并且展望了二氧化碳分离技术的未来发展趋势,提出了鉴于目前任何单一方法都不能满足燃煤电厂烟气治理的要求,应该综合各种技术的优点,制造吸附容量更高、选择性更强的复合材料,如吸附剂浸渍有机胺吸收液来提高吸附剂的选择性和吸附容量,膜材料浸渍胺的水溶液,多孔聚合物浸渍有机溶液,以及一些新型结构的吸收剂如离子溶液和金属有机骨架等等。 相似文献
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在活化MDEA溶液吸收CO2反应动力学理论指导下,以大量试验数据为依据,从工业生产的实际出发,探讨MDEA浓度和温度对吸收速率的影响。提出30%左右的MDEA浓度是适宜的操作浓度。 相似文献
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The removal of carbon dioxide from industrial gases, e.g. in thermal power stations to meet the discharge limits for CO2 in flue gases, is usually achieved with a reactive absorption technique using aqueous solutions of alkanolamines. From the absorption performance point of view, primary and secondary amines are preferred. However, in case the costs of the solvent regeneration are also taken into account, tertiary amines are much more attractive. In order to combine the specific advantages of tertiary and primary/secondary alkanolamines, both types of solvents are mixed. In this paper, mixtures of monoethanolamine and methyldiethanolamine with piperazine as absorption activator are experimentally compared with respect to CO2 removal performances at 25 °C. The absorption process in a special packed column has also been simulated with the use of published data on reaction kinetics, physicochemical properties (densities, viscosities, diffusivities, Henry coefficients) of the CO2‐amines systems, including experimentally determined hydrodynamic and mass transfer characteristics of the CO2 scrubber. 相似文献
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Among numerous techniques existing for reducing CO2 emissions, CO2 capture by absorption in aqueous alkanolamine solutions was specifically studied in this work. For the choice of the adequate amine solution, two major criteria must be taken into account: absorption performances (higher with primary and secondary amines) and energy costs for solvent regeneration (more interesting with tertiary and sterically hindered amines). The different types of amines can also be mixed in order to combine the specific advantages of each type of amines, an activation phenomenon being observed. Aqueous solutions of (piperazinyl‐1)‐2‐ethylamine (PZEA, a polyamine known as absorption activator) and 1‐amino‐2‐propanol (AMP, a sterically hindered amine), pure or mixed with other amines, are experimentally compared with respect to CO2 removal performances by means of absorption test runs achieved in a special gas‐liquid contactor at 25 °C. The positive impact of addition of PZEA to monoethanolamine (MEA), N‐methyldiethanolamine (MDEA), and AMP solutions was clearly highlighted. The absorption performances have also been satisfactorily simulated with coherent physicochemical data. 相似文献
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The influence of steric hindrance in amines upon different characteristics in carbon dioxide chemical absorption, namely, absorption rate, carbon dioxide loading, and regeneration degree, has been analyzed. Aqueous solutions of monoethanolamine, 1‐amino‐2‐propanol, and 2‐amino‐2‐methyl‐1‐propanol were used to compare their behavior during carbon dioxide absorption. The presence of one or two methyl groups on the carbon next to the amino group produced changes in the analyzed parameters. In addition, the influences of the gas‐flow rate and amine concentration on the chemical solvent behavior were studied to improve the mass transfer under different experimental conditions. 相似文献
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Biogas is a common renewable energy resource. A very important stage of biogas upgrading, studied in the present work, is its purification from H2S traces. The selective absorption of H2S and CO2 into oxido‐alkaline solutions containing hydrogen peroxide and into amine solutions was compared by performing absorption test runs in a cables‐bundle scrubber at 293.15 K and atmospheric pressure. The absorption rate and selectivity for H2S over CO2 were determined for various solute partial pressures, different alkaline absorbents and hydrogen peroxide concentrations in the scrubbing liquid, and different pH values. Higher H2S‐selective absorption performances with oxido‐alkaline solutions than with amine solutions could be observed provided that the solution is at a low pH value (9.5) and contains a sufficient hydrogen peroxide concentration. 相似文献
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Arunkumar Samanta 《Chemical engineering science》2009,64(6):1185-573
In this work, new experimental data on the rate of absorption of CO2 into piperazine (PZ) activated aqueous solutions of 2-amino-2-methyl-1-propanol (AMP) are reported. The absorption experiments using a wetted wall contactor have been carried out over the temperature range of 298-313 K and CO2 partial pressure range of 2-14 kPa. PZ is used as a rate activator with a concentration ranging from 2 to 8 wt%, keeping the total amine concentration in the solution at 30 wt%. The CO2 absorption into the aqueous amine solutions is described by a combined mass transfer-reaction kinetics-equilibrium model, developed according to Higbie's penetration theory. Parametric sensitivity analysis is done to determine the effects of possible errors in the model parameters on the accuracy of the calculated CO2 absorption rates from the model. The model predictions have been found to be in good agreement with the experimental results of rates of absorption of CO2 into aqueous (PZ+AMP). The good agreement between the model predicted rates and enhancement factors and the experimental results indicates that the combined mass transfer-reaction kinetics-equilibrium model with the appropriate use of model parameters can effectively represent CO2 mass transfer in PZ activated aqueous AMP solutions. 相似文献
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In this work, we study the process of CO2 absorption, at high partial pressures, in aqueous solutions of 3‐amino‐1‐propanol (AP), with respect to the thermal effects of this operation. All of the experiments were performed in a stirred tank gas‐liquid reactor with a flat, known interface. The variables considered were the AP concentration in the range of 0.1 to 3.0 M and the temperature within the interval of 288–313 K. From the results, we deduce that the process takes place in the instantaneous nonisothermal regime, and we propose an equation which relates the experimental results of molar flux with the initial amine concentration. At the same time, we can evaluate the temperature increase at the gas‐liquid interface. 相似文献
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A highly efficient technique of contaminant gas reduction, Turbulent Contact Absorber (TCA), is applied to CO2 removal from a typical flue gas. Aqueous K2CO3 sorbent was evaluated as a regenerable sorbent for CO2 from the flue gas. In order to identify the system, momentum and mass balance equations were written for the TCA tower. A flat plate falling film model was employed to simulate the TCA tower and the effect of turbulence was included in mass and momentum transfer coefficients. To check the accuracy of the model, a pilot scale TCA was built and operated. A Testo type gas analyzer was used to detect gas concentrations at the inlet and outlet of the rig. The model was validated successfully with pilot plant data. The effect of velocity and K2CO3 concentration on the TCA performance has also been carried out. It was found that the bed pressure drop increases linearly with gas velocity and then remains constant. An increase in the liquid flow rate increases liquid holdup, which leads to a rise in bed pressure drop. Higher turbulence within the TCA causes a velocity peak to shift from hypothetical gas‐liquid interface towards the falling film plate. An increase of the K2CO3 concentration from 1.0 g mol/L to 2.0 g mol/L was found to give an increase in CO2 removal by about 4 %. 相似文献
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The application of spray towers for CO2 capture is a development trend in recent years. However, most of the previous jobs were conducted in a cylindrical tower by using a single spray nozzle, whose configuration and performance is not good enough for industrial application. To solve this problem, the present work proposed a diameter-varying spray tower and a new spray mode of dual-nozzle opposed impinging spray to enhance the heat and mass transfer of CO2 absorption process. Experiments were performed to investigate the mass transfer performance (in terms of the CO2 removal rate (η) and the overall mass transfer coefficient (KGae2 are major factors, which affect the absorption performance and the maximums of η and KGae that are 94.0% and 0.574 kmol·m-3·h-1·kPa-1, respectively, under the experimental conditions. Furthermore, new correlations to predict the mass transfer coefficient of the proposed spray tower are developed in various CO2 concentrations with a Pearson Correlation Coefficient over 90%. 相似文献
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运用双膜理论对气液两相传质进行分析,针对二乙醇胺溶液吸收CO2建立数学模型,该模型精确描述CO2传质速率对溶液pH值依赖程度及速率强化因子随化学反应进行的变化情况. 从每种含碳离子(包括CO32-, HCO3-与RNHCOO-)在不同反应阶段的浓度分布角度分析了各自对总传质速率的影响规律,实验中分别控制溶液浓度、进气流量和复合溶液配比等工艺参数. 结果表明,CO2传质速率主要受CO32-与HCO3-控制,而RNHCOO-的作用有限. 吸收液浓度提高促进传质,但当pH值降至8.2后其作用减弱;传质速率随进气流量升高而加快,70 mL/min后趋于稳定;复配溶液较单一溶液对CO2吸收速率和吸收量均有促进作用,但复配比例变化对离子贡献率影响微弱. 相似文献