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首页> 外文期刊>International Journal of Offshore and Polar Engineering >Soil Freezing Characteristics and Temperature Distribution in In-Ground LNG Storage Tank
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Soil Freezing Characteristics and Temperature Distribution in In-Ground LNG Storage Tank

机译：地下液化天然气储罐的土壤冻结特征和温度分布

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摘要

The in-ground type of LNG storage tank is constructed below ground level, except for its roof, and has a slurry wall bearing soil and pore water pressure to store LNG in a safe condition. During the long-term operation, soil freezing occurs around the in-ground storage tank, despite the insulation provided inside the concrete tank, due to the cryogenic temperature of LNG. Experimental and numerical studies were conducted on the soil-freezing characteristics and on the temperature distribution for an LNG storage tank constructed in coarse-grained and fine-grained soil; these are presented. A major concern is the ability to predict the freezing pressure from the results of laboratory freezing tests. The freezing pressure arising within the soil samples and the temperature of the samples inside were monitored with elapsed time. The degree of saturation versus freezing pressure curve is presented for fine-grained soil samples, and the maximum pressure is closely related to this curve. A time domain reflectometry apparatus was used to measure the volumetric water content by measuring the unfrozen water contents of frozen soils. This paper presents the results of the numerical analysis for the LNG storage tank in the West Sea LNG Receiving Terminal to evaluate the temperature distribution of 4 in-ground storage tanks. The connected observation between the results of a laboratory freezing test and the numerical analysis has revealed that the temperature variation of the concrete structure and soil is predictable, and the results are applicable in designing the in-ground storage tank.
机译：地下式LNG储罐的顶部除外，其地下构造均低于地面，并且其泥浆壁承受土壤和孔隙水的压力，从而可以安全地存储LNG。在长期运行过程中，由于LNG的低温，尽管混凝土罐内提供了隔热层，但地下储罐周围仍发生土壤冻结。对在粗粒和细粒土壤中建造的液化天然气储罐的土壤冻结特性和温度分布进行了实验和数值研究。这些介绍。主要关注的是根据实验室冷冻测试结果预测冷冻压力的能力。用经过的时间监测土壤样品内部产生的冷冻压力和内部样品的温度。给出了细颗粒土壤样品的饱和度与冻结压力的关系曲线，最大压力与该曲线密切相关。使用时域反射仪，通过测量冷冻土壤的未冻结水含量来测量体积水含量。本文介绍了西海LNG接收站LNG储罐的数值分析结果，以评估4个地下储罐的温度分布。实验室冷冻测试结果与数值分析之间的联系观察表明，混凝土结构和土壤的温度变化是可以预测的，并且该结果可用于设计地下储罐。

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