A test device for simulating cryogenic leakage and splash guards

Abstract

This utility model discloses a simulated cryogenic leakage and splash guard test device, comprising: a liquid storage tank with at least two inlet pipes and an outlet pipe inserted thereon; a support leg assembly including multiple support legs; an insulation assembly including a prefabricated insulation layer and an on-site insulation structure; a leakage channel formed inside the prefabricated insulation layer, with its first end connected to the outlet pipe; and a recovery assembly including a guide plate and at least two liquid collection tanks located below the guide plate. The second end of the leakage channel extends to the bottom of the prefabricated insulation layer and is connected to the guide plate, so as to guide the second liquefied gas discharged through the outlet pipe to the liquid collection tank for recovery. This utility model, by setting a prefabricated insulation layer with a leakage channel formed inside it, and by simulating the actual cargo hold overflow principle, the cryogenic liquefied gas flow rate in the leakage channel, and the sealing performance of the insulation layer, shortens the overall cargo hold test time, reduces costs, and achieves rapid demonstration, thus having certain promotional value.

Description

Technical Field

[0001] This utility model relates to the field of liquefied natural gas cargo tank construction technology, and in particular to a test device for simulating low-temperature leakage and splash screen. Background Technology

[0002] Liquefied gas carriers are vessels used to transport large quantities of liquefied gas (LPG). LPG typically refers to a cryogenic liquid, primarily composed of gases such as methane and ethane, cooled to approximately -50°C to -163°C and compressed to a fraction of its gaseous volume. It is an important energy source and chemical raw material. LPG carriers are the main means of transporting LPG at sea, and are high-tech, high-difficulty, and high-value-added vessels. The containers holding the LPG are called cargo tanks, and are the most important facilities on an LPG carrier. According to the International Maritime Organization (IMO), cargo tanks are classified into Type A, Type B, Type C, and membrane-type cargo tanks based on their design. Due to the large temperature difference between LPG and the external environment, without insulation, a large amount of LPG will vaporize, leading to waste and safety issues.

[0003] Traditional liquid cargo tank insulation uses polyurethane or polystyrene foam materials, and the insulation methods are usually either sprayed or panel-assembled, but each has its own problems: 1) Among them, spray insulation is used, and the insulation material is bonded to the tank body. For Type B tanks, it is necessary to consider that in the event of leakage, the insulation layer can act as a splash screen to prevent liquid leakage and ensure that the leaked liquid flows out. Therefore, spray insulation is not suitable for the insulation of Type B liquid cargo tanks. 2) For panel-type assembled insulation, separating the insulation panel from the tank body is beneficial for draining leaked liquid, but it has the disadvantages of long test time and high cost for the whole tank. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a test device for simulating low-temperature leakage and splash screens, which solves the problems of high testing costs and long testing cycles due to the large cargo hold.

[0005] To achieve the above technical effects, this utility model provides a device for simulating low-temperature leakage and splash guard testing, which includes: A liquid storage tank, wherein at least two inlet pipes for inputting cryogenic liquefied gas are inserted at the top of the liquid storage tank and an outlet pipe for discharging the cryogenic liquefied gas is inserted at the bottom, and both the inlet pipes and the outlet pipe are connected to the interior of the liquid storage tank; The support leg assembly includes multiple support legs fixedly connected to the bottom of the liquid storage tank; The insulation component includes a prefabricated insulation layer fixedly installed on the outer surface of the bottom of the liquid storage tank and an on-site insulation structure surrounding the liquid storage tank and the outer periphery of the prefabricated insulation layer. A leakage channel is formed inside the prefabricated insulation layer, and the first end of the leakage channel is connected to the liquid outlet pipe; The recovery assembly includes a guide plate disposed at the bottom of the prefabricated insulation layer and at least two liquid collection tanks disposed below the guide plate. The second end of the leakage channel extends to the bottom of the prefabricated insulation layer and is connected to the guide plate to guide the cryogenic liquefied gas discharged through the liquid outlet pipe to at least two of the liquid collection tanks for recovery.

[0006] Preferably, each of the legs is provided with an insulating plate at the connection point between it and the liquid storage tank.

[0007] Preferably, the top of the liquid storage tank is also provided with a pressure gauge and a level gauge, and both the pressure gauge and the level gauge are inserted into the interior of the liquid storage tank.

[0008] Preferably, a pressure relief valve for adjusting the internal pressure of the liquid storage tank is installed on the side wall of the liquid storage tank.

[0009] Preferably, at least one discharge component is inserted and connected within the prefabricated insulation layer to release the pressure generated during the vaporization of the cryogenic liquefied gas within the prefabricated insulation layer, and at least one of the discharge components passes sequentially through the prefabricated insulation layer, the field insulation structure, and extends to the outside of the test device.

[0010] The technical effects achieved by this utility model due to the adoption of the above technical solution are as follows: By setting up a prefabricated insulation layer, a leakage channel is formed within the prefabricated insulation layer. By simulating the actual cargo hold overflow principle, the low-temperature liquefied gas flow rate in the leakage channel, and the sealing performance of the insulation layer, the overall cargo hold test time is shortened, costs are reduced, and rapid demonstration is achieved. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a first perspective view of the test device for simulating low-temperature leakage and splash guards according to an embodiment of this utility model.

[0013] Figure 2 This is a second perspective view of the simulated low-temperature leakage and splash screen test device of this utility model embodiment.

[0014] Figure 3This is a front view of the test device for simulating low-temperature leakage and splash protection in an embodiment of this utility model.

[0015] Figure 4 This is a side view of the simulated low-temperature leakage and splash screen test device according to an embodiment of this utility model.

[0016] Figure 5 yes Figure 3 AA section view.

[0017] Figure 6 yes Figure 4 BB cross-section diagram.

[0018] Figure 7 This is a partial top view of the structure in an embodiment of this utility model.

[0019] Figure 8 yes Figure 7 CC cross-section diagram The correspondence between the numbers in the attached diagram is as follows: 1. Support leg assembly; 2. Liquid storage tank; 3. On-site insulation structure; 4. First liquid inlet pipe; 5. Second liquid inlet pipe; 6. Liquid outlet pipe; 7. Pressure relief valve; 8. Pressure gauge; 9. Liquid level gauge; 10. Prefabricated insulation layer; 11. Leakage channel; 12. Baffle plate; 13. First liquid collection tank; 14. Second liquid collection tank; 15. Cryogenic liquefied gas; 16. Insulation board; 17. Bolt assembly; 18. Fixing assembly; 19. Discharge pipe; 20. Vent pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1 to 8As shown, this utility model embodiment provides a simulated cryogenic leakage and splash screen test device, including a liquid storage tank 2, a support leg assembly 1, a heat insulation assembly, a leakage channel 11, and a recovery assembly. The liquid storage tank 2 has at least two inlet pipes (in this embodiment, a first inlet pipe 4 and a second inlet pipe 5) inserted at its top for inputting cryogenic liquefied gas, and an outlet pipe 6 inserted at its bottom for discharging cryogenic liquefied gas. Both the at least two inlet pipes and the outlet pipe 6 are connected to the interior of the liquid storage tank 2. The support leg assembly 1 includes multiple legs fixedly connected to the bottom of the liquid storage tank 2. The heat insulation assembly includes a support leg fixedly installed on the liquid storage tank 2. The prefabricated insulation layer 10 on the bottom outer surface of the liquid tank 2 (in this embodiment, the prefabricated insulation layer 10 is fixed to the bottom plane of the liquid tank 2 by a fixing component 18, which can be in the form of bolts and fixing blocks) and the field insulation structure 3 surrounding the liquid tank 2 and the prefabricated insulation layer 10 (in this embodiment, field-foamed polyurethane foam is used to provide insulation, and the setting of the insulation component can effectively reduce the heat loss of the medium to meet the pressure and temperature required for the test); the leakage channel 11 is formed inside the prefabricated insulation layer, and the first end of the leakage channel 11 is connected to the liquid outlet pipe 6; Furthermore, the recovery assembly includes a guide plate 12 located at the bottom of the prefabricated insulation layer 10 and at least two liquid collection tanks located below the guide plate 12. The second end of the leakage channel 11 extends to the bottom of the prefabricated insulation layer 10 and is connected to the guide plate 12 to guide the cryogenic liquefied gas discharged through the liquid outlet pipe 6 to the at least two liquid collection tanks for recovery. It should be noted that in this embodiment, a first liquid collection tank 13 and a second liquid collection tank 14 are provided. The opening of the second liquid collection tank 14 is lower than the opening of the first liquid collection tank 13. After the cryogenic liquefied gas 15 is guided to the first liquid collection tank 13 by the guide plate 14, the second liquid collection tank 14 is provided to prevent the liquid inside the first liquid collection tank 13 from becoming overloaded and flowing to other places.

[0022] Please see Figure 1 , Figure 3 and Figure 6 As shown in this embodiment, each support leg is provided with an insulating plate 16 at the connection between it and the liquid storage tank 2. The insulating plate 16 is fixedly connected to the liquid storage tank 2 and the corresponding support leg by a bolt assembly 17. By setting the insulating plate 16, the liquid storage tank 2 can prevent the temperature from being transferred to the support leg assembly 1 after receiving liquid, thereby causing the support leg assembly 1 to deform at low temperature.

[0023] Furthermore, in this embodiment, the top of the liquid storage tank 2 is also provided with a pressure gauge 8 and a level gauge 9, and both the pressure gauge 8 and the level gauge 9 are inserted into the interior of the liquid storage tank 2. Preferably, a pressure relief valve 7 for adjusting the internal pressure of the storage tank 2 is installed on the side wall of the storage tank 2. The cryogenic liquefied gas 15 enters the storage tank 2 through the first inlet pipe 4 and the second inlet pipe 5. The internal pressure of the storage tank 2 is determined by checking the pressure gauge 8. If the pressure is too high, the pressure relief valve 7 is opened to release the internal pressure to the design pressure. The liquid level inside the storage tank 2 is determined by the level gauge 9. When the liquid level reaches the liquid outlet height of the outlet pipe 6, the liquid flow rate of the leakage channel 11 is checked and the inlet speed is adjusted according to the design flow rate. An on-site insulation structure 3 is also set on the outer periphery of the prefabricated insulation layer 10. When the cryogenic liquefied gas 15 enters through the first inlet pipe 4 and the second inlet pipe 5, the liquid level inside the storage tank 2 is checked by the level gauge 9, and it is observed whether there are cold spots, frost, or other phenomena on the surface of the prefabricated insulation layer 10.

[0024] Please see Figure 2 and Figure 8 As shown, in this embodiment, at least one discharge component is inserted and connected inside the prefabricated insulation layer to release the pressure generated when the low-temperature liquefied gas in the prefabricated insulation layer 10 is vaporized. The at least one discharge component passes through the prefabricated insulation layer 10 and the field insulation structure 3 in sequence and extends to the outside of the test device. It should be noted that in this embodiment, at least one discharge component is formed by inserting a discharge pipe 19 and a vent pipe 20 inside the prefabricated insulation layer 10 respectively.

[0025] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A splash screen test device for simulating cryogenic leaks, characterized in that, include: A liquid storage tank, wherein at least two inlet pipes for inputting cryogenic liquefied gas are inserted at the top of the liquid storage tank and an outlet pipe for discharging the cryogenic liquefied gas is inserted at the bottom, and both the inlet pipes and the outlet pipe are connected to the interior of the liquid storage tank; The support leg assembly includes multiple support legs fixedly connected to the bottom of the liquid storage tank; The insulation component includes a prefabricated insulation layer fixedly installed on the outer surface of the bottom of the liquid storage tank and an on-site insulation structure surrounding the liquid storage tank and the outer periphery of the prefabricated insulation layer. A leakage channel is formed inside the prefabricated insulation layer, and the first end of the leakage channel is connected to the liquid outlet pipe; The recovery assembly includes a guide plate disposed at the bottom of the prefabricated insulation layer and at least two liquid collection tanks disposed below the guide plate. The second end of the leakage channel extends to the bottom of the prefabricated insulation layer and is connected to the guide plate to guide the cryogenic liquefied gas discharged through the liquid outlet pipe to at least two of the liquid collection tanks for recovery.

2. The simulated cryogenic leak, splash shield test apparatus of claim 1, wherein: An insulating plate is provided at the connection between each of the legs and the liquid storage tank.

3. The simulated cryogenic leak, splash shield test apparatus of claim 1, wherein: The top of the liquid storage tank is also equipped with a pressure gauge and a level gauge, and both the pressure gauge and the level gauge are inserted into the interior of the liquid storage tank.

4. The simulated cryogenic leak, splash shield test apparatus of claim 1, wherein: A pressure relief valve for adjusting the internal pressure of the liquid storage tank is installed on the side wall of the liquid storage tank.

5. The simulated cryogenic leak, splash shield test apparatus of claim 1, wherein: At least one discharge component is inserted and connected within the prefabricated insulation layer to release the pressure generated during the vaporization of the cryogenic liquefied gas within the prefabricated insulation layer, and at least one of the discharge components passes sequentially through the prefabricated insulation layer, the field insulation structure, and extends to the outside of the test device.

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