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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Thermodynamic response of gas injection-and-withdrawal process in salt cavern for underground gas storage
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Thermodynamic response of gas injection-and-withdrawal process in salt cavern for underground gas storage

机译：地下储气储煤中盐穴注除加工过程的热力学响应

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摘要

Cycled mode of operation leads to temperature and pressure variation in salt cavern for underground gas storage due to mechanical and thermal loading. In this study, based on metamorphic thermodynamic principle, a mathematical model of thermal analysis is proposed for gas injection-and-withdrawal process, formulates a newly analytical solution to temperature and pressure variation with time during injection-and-withdrawal process. The proposed solution is validated with the withdrawal test results. The derived solution can be set as boundary conditions for the thermal-mechanical numerical modeling, which is capable of calculating thermodynamic response for both constant and inconstant air mass flow rate. Fully coupled thenno-mechanical numerical simulations are preformed to evaluate thermal effects on cavern wall at different gas withdrawal and injection rates. The results indicate that during process of gas-withdrawal, fast withdrawal rate leads to increase of tensile stresses, and there are distinctive tensile stress areas on the roof and floor of the cavern; while in the gas-injection period, there are no tensile stress area, however, it inclines to occur stress disturbance at intervention of interlayers. Parameters analysis shows that both the thermal coefficients and variation of injection-and-withdrawal rates have impacts on the thermodynamic responses of surrounding rock mass.
机译：循环的操作模式导致盐洞的温度和压力变化由于机械和热负荷导致地下储气。在这项研究中，基于变质热力学原理，提出了一种用于气体注射和取出过程的热分析的数学模型，适用于注射和取出过程中的时间的新分析溶液。提出的解决方案验证了戒断试验结果。衍生的解决方案可以被设定为热机械数值建模的边界条件，其能够计算恒定和不全气质流量的热力学响应。完全耦合的那种机械数值模拟是预先形成的，以评估不同气体戒断和注射率的洞穴壁的热效应。结果表明，在燃气戒断过程中，快速取出率导致拉伸应力的增加，并且洞穴的屋顶和地板上存在独特的拉伸应力区域;虽然在气体喷射期间，但没有拉伸应力区域，然而，它倾向于在中间层的干预时发生应力干扰。参数分析表明，热量系数和注射和抽出率的变化都对周围岩体的热力学响应产生了影响。

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