地下储气库压缩空气温度时空分布与温控方法

Study on Temporal and Spatial Distribution and Temperature Control Methodsof the Compressed Air in Underground Cavern

为准确认识压气储能电站地下储气库在初次运行条件下的压缩空气动态热力学特性,建立了考虑压缩空气与围岩间共轭传热以及非等温流动的储气库热力学数值分析模型,并对其合理性进行了验证。通过对比分析等容积条件下不同洞室形状的储气库压缩空气热力学特性变化过程以及温度空间分布规律,提出了两种压缩空气的温控工艺并对其效果进行了分析。研究结果表明,不同洞室形状的储气库在相同工作压力下的压缩空气平均温度值差异较大;洞室形状对储气库压缩空气温度空间分布规律影响显著,其中隧道式储气库出现了局部高温现象;延长初次充气时间对隧道式储气库的温控效果较差,而合理布置进出气口位置对隧道式储气库的温控效果良好。

In order to accurately understand the thermodynamic characteristics of compressed air in a storage cavern of compressed air energy storage(CAES)plants during the first operation cycle,a numerical model for compressed air thermodynamics in storage cavern was eastablished by considering the feature of conjugate heat transfer between fluid and surrounding rock,and the feature of non-isothermal flow.The model was also validated by Huntorf CAES plant data.Based on the comparison analysis of the thermodynamic process of compressed air in the different shape of caverns with the same volume and of the spatial distribution charateristics of temperature,two ways for temperature control of compressed air in the cavern were proposed,and their effects were also explored by numerical method.The research results show that the average temperatures of compressed air in caverns with different profile shape are significantly different,even if the opreation pressures are the same.The cavern shapes also have a significant influence on the spatial distribution characteristics of compressed air temperature.Local high temperature phenomenon occurs in the tunnel type of cavern.For the tunnel type of cavern,the temperature control effect of the measurement such as extending the initial charging time is poor,while the way of reasonable arrangement of the air inlet and outlet positions has a good effect on temperature control.