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首页> 外文期刊>International Journal of Heat and Mass Transfer >Transient model of carbon dioxide desublimation from nitrogen-carbon dioxide gas mixture
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Transient model of carbon dioxide desublimation from nitrogen-carbon dioxide gas mixture

机译：氮气-二氧化碳气体混合物中二氧化碳脱附的瞬态模型

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摘要

Carbon dioxide (CO2) cryogenic desublimation separation has become an emerging carbon capture method in recent years due to its advantages of a contamination-free process and compactness. So far, there have been few research works on revealing the detailed desublimation characteristics of CO2associated with the flow as well as mass and energy conservation in the practical cryogenic CO2capture process. In this study, a transient model for analyzing the CO2cryogenic desublimating in mixture gas is proposed. The model contains a tube-in-tube counter-flow heat exchanger including three control volumes, the nitrogen (or helium) coolant, the wall with the solid CO2layer and the mixture. The deposition distribution, capture rate and energy consumption of the dynamic desublimation process under different operation conditions are investigated. The model is verified by some experiment results. Results show that an improved modeling accuracy is obtained by taking the solid CO2layer into consideration. During the dynamic desublimation process, the deposition rate is the highest near the inlet of gas mixture due to the high mass diffusion there, and a low energy consumption will be obtained at high concentration and low flow velocity of CO2supply. The theoretical method here provides better understanding of the CO2desublimation features in annular tube, which will be helpful for conducting an efficient CO2capture process.
机译：二氧化碳（CO2）低温升华分离技术由于其无污染工艺和紧凑性的优势，近年来已成为一种新兴的碳捕获方法。到目前为止，在实际的低温二氧化碳捕集过程中，很少有研究工作揭示与流动相关的二氧化碳的详细升华特性，以及质量和能量守恒。在这项研究中，提出了一个用于分析混合气体中二氧化碳低温升华的瞬态模型。该模型包含一个管中管逆流热交换器，包括三个控制体积，氮气（或氦气）冷却剂，带有固体CO2层的壁和混合物。研究了不同操作条件下动态升华过程的沉积分布，捕获率和能耗。通过一些实验结果验证了该模型。结果表明，通过考虑固体二氧化碳层可以提高建模精度。在动态升华过程中，由于气体混合物的高质量扩散，沉积速率在气体混合物的入口附近最高，并且在高浓度和低CO2供应流速下将获得较低的能耗。这里的理论方法可以更好地理解环形管中的CO2升华特性，这将有助于进行有效的CO2捕获过程。

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