[0022] Example
[0023] A double thermal angle protection structure, such as Figure 1 ~ Figure 2 As shown, it is arranged between the inner and outer tanks 1 of the low-temperature storage tank, and includes an upper thermal corner structure and a lower thermal corner structure 12;
[0024] The upper thermal corner structure includes the thermal corner protective wall plate 2, the lower edge plate 13, the upper sliding bottom plate 11, the edge baffle 16 and the flexible sealing layer 15 with a uniform ring tank body design; the lower edge plate 13 is flat, and the thermal corner is protected The wall plate 2 is erected on one end of the lower edge plate 13 close to the outer tank 1. The thermal corner protection wall plate 2 and the lower edge plate 13 are preferably connected by a fixed method such as welding at 90°; the upper sliding bottom plate 11 is laid on the edge of the lower layer The board 13 can be slid freely. Specifically, the upper sliding bottom plate 11 is connected to the main body of the lower edge board 13 by an inclined or vertical section. There is a certain distance between the lower edge board 13 and the main body of the upper sliding bottom board 11. Activity space.
[0025] The edge baffle 16 is erected on the upper sliding bottom plate 11, and the edge baffle 16 and the upper sliding bottom plate 11 are preferably connected by a fixed method such as welding at 90°; the edge between the thermal corner protection wall plate 2 and the edge baffle 16 The lower edge plate 13 and the upper sliding bottom plate 11 are laid with a flexible sealing layer 15 with telescopic performance;
[0026] The lower thermal corner structure 12 includes a thermal insulation layer arranged between the upper thermal corner structure and the outer tank 1. The thermal insulation layer can maintain good thermal insulation performance in a low-temperature environment, and serves as the second most important part of the upper thermal corner structure. For protection, in this embodiment, the thermal insulation layer may be a foamed glass brick, preferably a high-density polyurethane layer, and the polyurethane is provided by spraying or the like.
[0027] A thermal corner protective top ring plate 4 is provided between the top of the thermal insulation layer and the thermal corner protective wall plate 2. The thermal corner protective top ring plate 4 and the thermal corner protective wall plate 2 are preferably fixed by welding, and the thermal corner protective top ring The plate 4 is used to protect the lower thermal corner structure 12.
[0028] With the solution of this embodiment, the low temperature medium is normally allowed, the upper sliding bottom plate 11 and the edge baffle 16 will shrink to the center due to low temperature, and the upper sliding bottom plate 11 can slide freely because it overlaps on the lower edge plate 13, so Do not affect each other. The connection between the thermal corner protective wall plate 2 and the lower edge plate 13 will not produce temperature difference stress except for its own shrinkage, and the upper thermal corner protective structure will therefore not be damaged under normal working conditions. When low-temperature medium leakage occurs in the inner tank, the upper sliding bottom plate 11 can also shrink freely without generating temperature difference stress, and the flexible sealing layer 15 covers and seals the area between the thermal corner protective wall plate 2 and the edge baffle 16 to ensure The cryogenic medium will not leak further down. Even under extreme working conditions, the upper hot corner structure is damaged, the lower hot corner structure 12 can still withstand the low-temperature impact of the leaking medium without being damaged, and it doubles the protection of the connection between the outer tank 1 tank wall and the tank bottom. .
[0029] In this embodiment, the two ends of the flexible sealing layer 15 are respectively bonded to the thermal corner protective wall plate 2 and the edge baffle 16 with low temperature glue. Adopt the method of bonding at both ends, the middle is a free section, and the free section is laid on the upper sliding bottom plate 11 and the lower edge plate 13. Due to the telescopic function, the middle free section of the flexible sealing layer 15 has a certain degree of protection against shrinkage at low temperatures. Tear effect. In this embodiment, the flexible sealing layer 15 is preferably a flexible composite fiber cloth made of glass fiber aluminum material.
[0030] In this embodiment, the flexible sealing layer 15 is folded at the edge baffle 16, and an elastic support 14 is also provided between the thermal corner protection wall 2 and the edge baffle 16. The elastic support 14 is preferably in the LNG storage tank. The elastic felt is widely used in this paper, and the elastic support portion 14 is used to support the folded portion of the flexible sealing layer 15. The folds are arranged to function as a telescopic expansion joint, which further ensures that the flexible sealing layer 15 will not be torn and damaged when the upper sliding bottom plate 11 is contracted at low temperature. At the same time, the elastic support 14 is provided for the vertical folding part of the flexible sealing layer 15 The support ensures that the flexible sealing layer 15 will not overturn when shrinking and rebounding.
[0031] This embodiment also provides a low-temperature storage tank, which includes an inner tank and an outer tank 1. The double thermal angle protection structure described in this embodiment is provided between the inner tank and the outer tank 1.
[0032] In this embodiment, a tank wall elastic felt 5 and perlite 3 are arranged between the inner tank wall 6 and the inner wall of the outer tank 1 in sequence, and a leveling is provided between the middle of the inner tank bottom plate 8 and the double thermal angle protection structure. Layer 9 foam glass bricks 10 or other cold insulation materials, concrete ring walls 7 are set between the two sides of the inner tank bottom plate 8 and the double thermal angle protection structure as a support, and the outer tank 1 can be a concrete outer tank or a metal outer tank. In the case of a concrete outer tank, an inner wall lining board is also arranged between the lower thermal corner structure 12 and the inner wall of the outer tank 1.
[0033] In this embodiment, the lower edge plate 13 and the upper sliding bottom plate 11 of the dual thermal corner protection structure are placed under the concrete ring wall 7, so that the temperature of the thermal corner protection bottom plate under normal operating conditions is increased, and the bottom plate is reduced. The amount of low-temperature shrinkage under normal operating conditions also reduces the amount of use of the lower thermal corner structure 12 and saves costs.
[0034] Using the low-temperature storage tank of this embodiment solves the problem of low-temperature shrinkage of the thermal corner protection structure, and improves the safety and stability of the low-temperature storage tank.
