A new spherical series-parallel model for effective thermal conductivity of hydrate

被引：0

作者：

Sun S. ^{[1
]}

Gu L. ^{[1
]}

Yang Z. ^{[1
]}

Li Y. ^{[1
]}

机构：

[1] Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation/, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Shandong, Qingdao

来源：

Natural Gas Industry | 2022年 / 42卷 / 10期

关键词：

Effective thermal conductivity; Ice power method; Natural gas hydrate; Pore fluid; Porosity; Sample preparation; Sample quality; Spherical series-parallel model;

D O I：

10.3787/j.issn.1000-0976.2022.10.013

中图分类号：

学科分类号：

摘要：

Thermal conductivity is one of the important thermophysical parameters of natural gas hydrate, but the thermal conductivity of pure hydrate can be hardly measured because there are pores in the hydrate samples prepared in the laboratory. Based on the principle of thermal resistance, a new spherical series-parallel model for the effective thermal conductivity of hydrate was developed. The semi-empirical equation of the thermal conductivity of pure methane hydrate was obtained according to the existing experimental data, while through this model, the effective thermal conductivity and porosity of hydrate samples were calculated and the influence of sample preparation method on sample quality was analyzed. The thermal conductivity of pure methane hydrate is in the range of 0.755 7–0.771 2 W/(m·K) under the pressure of 4.0–9.5 MPa and the temperature of 263.15 K – 279.15 K. Compared with porosity, the properties of pore fluid had a greater influence on the measurement results. Sample compaction effectively reduced porosity, but caould not realize zero porosity. The residual surfactant in the sample prepared by the dissolved gas method impacts the purity of the sample. The average porosity of samples prepared by the pre-compacted ice powder method was 18.73% ± 0.23%, which is better than that by the general compaction method.

引用

页码：131 / 138

页数：7

共 35 条

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