Insoluble sediments may block the debrining inner tubing (DIT) in a salt cavern during construction. Most previous studies of this problem have simplified the sediment particles to spheres, which leads to significant errors in the predicted moving critical velocity of these sediment particles. In this paper, the morphological and hydraulic characteristics of sediments are quantitatively analyzed by a series of experiments. A model for calculating the minimum moving critical velocity of irregular sediment particles is established. Preventive measures for the clogging of DIT are proposed. Results show that the statistical mean values of sphericity and area circularity of sediments are 0.44 and 0.56, respectively. The moving critical velocity of sediments is much smaller than that of spherical particles of the same mass. The shape coefficient can characterize the drag coefficient of irregular sediment. Reasonable control of the minimum safe distance (MSD) between DIT and the sediment surface is an effective method to prevent DIT clogging. If the debrining rate is decreased from 200 to 20 m/h, the MSD can be decreased from 2.49 m to 0.2 m, which can increase the debrining brine volumes and the working gas volume of the cavern. The MSD in the Jintan underground gas storage salt cavern can be optimized from 4 m to 0.9 m, which can increase the working gas volume of 2.734 million m. Research results provide a technological reference for preventing clogging of DIT and the optimization of debrining parameters.

中文翻译：

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储气盐库施工过程中排除脱盐管堵塞的预防

施工期间，不溶性沉积物可能会堵塞盐洞中的除盐内管 (DIT)。以往对此问题的研究大多将沉积物颗粒简化为球体，这导致这些沉积物颗粒的移动临界速度的预测存在显着误差。本文通过一系列实验对沉积物的形态和水力特征进行了定量分析。建立了不规则沉积物颗粒最小移动临界速度的计算模型。提出了DIT堵塞的预防措施。结果表明，沉积物球形度和面积圆度的统计平均值分别为0.44和0.56。沉积物的移动临界速度比相同质量的球形颗粒小得多。形状系数可以表征不规则沉积物的阻力系数。合理控制DIT与沉积物表面的最小安全距离（MSD）是防止DIT堵塞的有效方法。如果脱盐速率由200 m/h降低到20 m/h，则MSD可以由2.49 m降低到0.2 m，从而可以增加脱盐盐水量和洞室工作气体量。金坛地下储气库盐穴MSD由4m优化至0.9m，可增加工作气量273.4万立方米。研究结果为防止DIT堵塞和优化脱盐参数提供了技术参考。