为研究压气储能(CAES)储气库衬砌密封层开裂对裂隙围岩的两相渗流和传热特性的影响,基于COMSOL平台,利用弱形式PDE二次开发了双重介质两相渗流计算程序,并进行了验证。以某CAES储气库为背景,建立了储气库裂隙岩体两相渗流传热数值模型,研究了充放气过程中衬砌开裂对裂隙围岩的两相渗流和传热特性的影响。结果表明:① 衬砌开裂会使围岩裂隙和孔隙内渗流压力升高,同时导致裂隙和孔隙之间的渗流压力差增大,最大压差增大1.5 MPa。② 运行210 d后,衬砌开裂将导致渗漏的气体水平扩散范围由无开裂的54 m扩大至66.7 m。③ 初次充放气条件下,衬砌内外侧温差大,有可能超过100 K;衬砌开裂和围岩裂隙对衬砌和围岩温度分布影响微弱。因此衬砌开裂会造成渗流压力扩散,但对温度分布影响微弱。
Abstract
The aim of this research is to investigate the impact of liner seal cracking on the two-phase seepage and heat transfer characteristics of fractured surrounding rock in compressed air energy storage (CAES) cavern. A dual-media two-phase seepage calculation program was developed and validated based on a weak form of PDE using COMSOL. On this basis, a numerical model was constructed to examine the impact of liner cracking on two-phase seepage and heat transfer characteristics in the fractured rock mass during gas charging and discharging processes. The findings reveal that liner cracking induces an increase in seepage pressure within both the fractures and pore spaces of the surrounding rock, and consequently leads to an amplified seepage pressure difference between the fractures and pore spaces, with a maximum pressure difference increase of 1.5 MPa. Over a period of 210 days of operation, liner cracking results in the expansion of the horizontal gas diffusion range from 54 m in the absence of cracking to 66.7 m. Under the initial gas charging and discharging conditions, a significant temperature difference exceeding 100 K can be observed between the inner and outer sides of the liner. However, liner cracking and fractures in surrounding rock exhibit minimal effects on the temperature distribution of both the liner and the surrounding rock. It is evident that while liner cracking facilitates seepage pressure diffusion, its impact on temperature distribution remains negligible.
关键词
压缩空气储能 /
双重介质 /
两相渗流传热 /
COMSOL弱形式 /
裂隙岩体
Key words
compressed air energy storage /
dual-media /
two-phase seepage and heat transfer /
COMSOL weak form /
fractured rock mass
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基金
国家自然科学基金项目(52178381,51778070)
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