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CO_2 HYDRATE GROWTH MODEL AND RELATED EXPERIMENTAL DATA

机译:CO_2水合物生长模型及相关实验数据

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摘要

CO_2 hydrate slurry have been proposed to be suitable for refrigeration application. In this study, the hydraternforming conditions are experimentally investigated. CO_2 hydrates are formed from CO_2 and water mixture atrnelevated pressures by cooling down the solution until a supersaturated condition is obtained. A theoreticalrncrystal growth model is presented that will be used to predict the amount of hydrates produced in the experimentalrnset-up. The previously developed flash model is used to predict the CO_2 concentration in the bulkrnliquid under super-saturation conditions. Equilibrium conditions, which are expressed through the equality ofrnfugacities of each component in all phases, are assumed at the hydrate-liquid interface. The resulting concentrationrndifference between bulk and interface is the driving force considered for the mass transfer from solutionrninto the hydrate crystals. This will be combined with a simultaneous heat and mass transfer model andrnused in a control volume approach. This allows for the prediction of amount of crystal material formed as thernsolution flows through a coil heat exchanger.
机译:已经提出了CO_2水合物浆料适合于制冷应用。在这项研究中,对水合物形成条件进行了实验研究。通过冷却溶液直至获得过饱和条件,在升高的压力下由CO_2和水的混合物形成CO_2水合物。提出了理论上的晶体生长模型,该模型将用于预测实验装置中产生的水合物的量。先前开发的闪蒸模型用于预测过饱和条件下本体液体中的CO_2浓度。假设在水合物-液体界面处达到平衡条件,平衡条件通过各组分在所有相中的逸度相等来表示。所得的体积与界面之间的浓度差是从溶液到水合物晶体的质量转移所考虑的驱动力。它将与同时传热和传质模型结合在一起,并以控制量方法使用。这使得能够预测随着溶液流过盘管热交换器而形成的晶体材料的量。

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