Temperature and pressure correlation for volume of gas hydrates with crystal structures sI and sII
Temperature and pressure correlation for volume of gas hydrates with crystal structures sI and sII
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晶体结构 sI 和 sII 气体水合物体积的温度和压力相关性
DOI:
10.1051/epjconf/201714302141
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
C. Breitkopf
中科院分区:
文献类型:
--
作者:
V. Vinš;A. Jäger;S. Hielscher;R. Span;J. Hrubý;C. Breitkopf
The temperature and pressure correlations for the volume of gas hydrates forming crystal structures sI and sII developed in previous study [Fluid Phase Equilib. 427 (2016) 268-281], focused on the modeling of pure gas hydrates relevant in CCS (carbon capture and storage), were revised and modified for the modeling of mixed hydrates in this study. A universal reference state at temperature of 273.15 K and pressure of 1 Pa is used in the new correlation. Coefficients for the thermal expansion together with the reference lattice parameter were simultaneously correlated to both the temperature data and the pressure data for the lattice parameter. A two-stage Levenberg Marquardt algorithm was employed for the parameter optimization. The pressure dependence described in terms of the bulk modulus remained unchanged compared to the original study. A constant value for the bulk modulusB0= 10 GPa was employed for all selected hydrate formers. The new correlation is in good agreement with the experimental data over wide temperature and pressure ranges from 0 K to 293 K and from 0 to 2000 MPa, respectively. Compared to the original correlation used for the modeling of pure gas hydrates the new correlation provides significantly better agreement with the experimental data for sI hydrates. The results of the new correlation are comparable to the results of the old correlation in case of sII hydrates. In addition, the new correlation is suitable for modeling of mixed hydrates.
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DOI:
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发表时间:
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