Energy storage tank strength

Are molten salt tanks a thermal energy storage system?

Thermal energy storage systems in CSP plants, particularly the widely used molten salt tanks, are advantageous for increasing efficiency and reducing costs [3, 4]. Recent studies have focused primarily on the structural design and thermal characteristics of molten salt tanks.

How much stress does a weld tank have?

The von Mises stress ranges from 11.3 kPa to 215.9 MPa for the cold tank and 23.4 kPa to 166.0 MPa for the hot tank, with the maximum values located at the top weld toe, as shown in Fig. 5. The Tresca stress demonstrates a similar distribution, with maximum values of 241.2 MPa and 177.2 MPa in the cold and hot tanks, respectively.

How is stress measured in a tank wall?

The stress in the tank wall is evaluated through stress linearization, and the results of the calculated primary stresses along the five selected linearization lines satisfy the requirements for structural safety. The stress concentration in the weld region is also studied.

What is the stress distribution in cold and hot tanks?

According to the overall stress distributions in the cold and hot tanks, the stress value at each point is below the yielding stress of the materials.

What is the maximum wall displacement of cold and hot tanks?

The maximum wall displacement of the cold and hot tanks with corresponding sizes of 9.88 mm and 7.86 mm are located at 1.70 m and 1.85 m from the bottom of the tank, respectively. Long-period large deformation may cause irreversible plastic damage.

What is the average operating liquid level of the two tanks?

The average operating liquid level of the two tanks is 12 m. The structures of the two tanks are designed based on API 650–2013 , GB 50341–2014 , and SH 3046–1992 . A self-supporting, ribbed dome roof is selected for two tanks.