流体机械

2013, v.41;No.497(11) 66-70

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CO_2水合物浆固相分数的计算及其对流动特性的影响
Solid Fraction Determination and the Flow Property of CO_2 Hydrate Slurry

刘妮;余宏毅;戴海凤;
LIU Ni;YU Hong-yi;DAI Hai-feng;University of Shanghai for Science and Technology;

摘要(Abstract):

CO2水合物浆做为一种新型的两相载冷剂,具有较高的相变潜热和合适的相变温度,在蓄冷领域有良好的发展前景。而明确水合物浆的物性参数及其计算方法是对其进行高效安全应用的基础。本文对CO2在水合物存在下的溶解度特性及其流变特性等计算方法进行了分析探讨,建立了CO2水合物浆固相分数的理论计算模型,并试验研究了不同固相分数下CO2水合物浆的流动特性,结果发现流速0.6~0.65m/s为流动特性的转折区域。在低流速时,CO2水合物浆的流变指数小于1,且随着固相分数的增大而减小。研究结果可为CO2水合物浆蓄冷技术的发展应用提供理论指导。
CO2 hydrate slurries are two-phase fluids composed of hydrate crystals in suspension in a liquid phase. The interest in CO2hydrate slurries is not limited to CO2 capture and storage for the ever increasing CO2 concentration in the atmosphere. One of the applications relates to secondary refrigeration due to the high latent heat of melting CO2 hydrates and used as phase-change materials. Moreover,the melting temperatures of CO2 hydrate slurries are consistent with the temperature need in cool storage applications such as air conditioning. However,the investigation of the parameters of CO2 hydrate slurries and the approaches to determine the parameters are essential for safe and efficient application. In this paper,the methods to determine various parameters of CO2 hydrate slurries are discussed,including CO2 solubility in the presence of gas hydrate,apparent viscosity,and the rheological property. Based on the mass balance of CO2 in different states,a solid fraction model is proposed which can be used to calculate the solid fraction of CO2 hydrate slurries. The flow property of CO2 hydrate slurries are studied experimentally. The results show a transition zone for CO2 hydrate slurries at the flow velocity of 0. 6 ~ 0. 65m / s. At v < 0. 6m / s,the rheological index is lower than 1 and it decreases with the increase of solid fraction. This research work provides significant guide for the development and practical application of CO2 hydrate slurries.

关键词(KeyWords): CO2水合物浆;溶解度;固相分数;流变特性
CO2 hydrate slurry;solubility;solid fraction;rheological property

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(50706028);; 上海市教委科研创新项目(12YZ106)

作者(Authors): 刘妮;余宏毅;戴海凤;
LIU Ni;YU Hong-yi;DAI Hai-feng;University of Shanghai for Science and Technology;

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