含夹层盐穴建腔期浓度场相似试验

Similar Experiment of the Concentration Field in Layered Salt-rock Cavity in Construction Period

以湖北云应地区层状盐岩能源地下储库群建造工程为背景,利用相似理论中的量纲分析法建立建腔期腔内浓度场相似模拟实验平台,对含夹层盐穴建腔期腔内浓度场分布进行系统分析,为含夹层盐穴的形状优化提供理论依据。研究发现:夹层的存在并不改变卤水浓度随时间成指数分布的规律;除边界层外,溶腔内夹层周围卤水浓度在同一水平面上是均匀分布的;当单一短夹层处于进水口上方时,腔内夹层周围卤水浓度在竖直方向上较无夹层时有所降低,而进水口下方的卤水浓度在竖直方向基本能和无夹层腔内卤水浓度相同;当单一短夹层处于进水口下方时,夹层上方的卤水浓度升高且夹层上下方卤水浓度梯度减小;夹层数量增加到2个时,不仅夹层周围的卤水浓度会有相应的变化,腔内卤水浓度也会整体升高;增加夹层的长度,腔内卤水浓度随深度的变化趋势不会改变,但会整体提高腔内卤水浓度。

Taking the Yunying underground energy storage of layered salt rock in Hubei province as a demonstration project,a similar simulation experimental platform of concentration field in construction period of salt caverns was established based on the similar theory of dimensional analysis. The concentration distribution in salt rock cavity with interlayer in construction period was studied for providing the theory basis of shape optimization. The results showed that when there are interlayers existing in the cavity,the concentration of brine is subjected to exponential distribution with time,which is the same as that without interlayer. Except for boundary layer,the concentration of brine around the interlayer in the same level is uniformly distributed. When the cavity has a single short interlayer which located over the water inlet,the concentration of brine around the interlayer will decrease compared with the cavity with no interlayer,but the concentration of brine which below the water inlet will keep un-changed. When the single short interlayer is located under the water inlet,the concentration of brine which over the interlayer will increase and the concentration gradient around the interlayer in vertical direction will decrease. When there are two interlayers existed in the cavity,the concentration of brine around the interlayer will change accordingly,and the cavity's concentration will increase integrally. Lengthening the interlayer,the trend of the brine's concentration with depth will stay the same,but it will increase the concentration of the cavity.