LNG (Liquefied Natural Gas) storage tank open type cold insulation system for recovering cooling capacity of cooling water

Abstract

The utility model relates to the technical field of cold insulation systems, in particular to an LNG (Liquefied Natural Gas) storage tank open type cold insulation system capable of recovering cooling capacity of cooling water. According to the technical scheme, the system comprises an LNG storage tank used for storing liquefied natural gas, and the output end of the LNG storage tank communicates with a high-pressure pump through a pipeline; the open-frame vaporizer is arranged at the output end of the high-pressure pump and used for exchanging heat of seawater, and the output end of the open-frame vaporizer is communicated with a shutoff valve through a pipeline; the cooling assembly is fixedly arranged on the outer wall of the LNG storage tank and used for heat insulation, and a driving assembly used for driving the cooling assembly to rotate is arranged at the upper end of the LNG storage tank. Cooling water is sprayed to the outer wall face of the LNG storage tank through the spray head, the outer wall face of the LNG storage tank is cooled, and the outer wall face of the LNG storage tank is kept at a low temperature, so that the evaporation capacity of BOG in the LNG storage tank is reduced, the internal pressure of the LNG storage tank is prevented from rising, and the operation safety of the LNG storage tank is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cold insulation systems, in particular to an open cold insulation system for an LNG storage tank that recovers the cooling water heat quantity. Background Art

[0002] An LNG storage tank is a container for storing liquefied natural gas. The superiority of its cold insulation performance is directly related to the economy of the operation of the LNG storage tank. The existing LNG stored in the tank is approximately at -162°C. Although the storage tank has good heat insulation performance, it still inevitably absorbs the heat transmitted from the outside world, which causes part of the LNG to evaporate into gas. This part of the evaporated gas is BOG. If the BOG is not processed in time, it will cause the pressure of the storage tank to rise and affect the safe operation of the storage tank. For this reason, the utility model proposes an open cold insulation system for an LNG storage tank that recovers the cooling water heat quantity. Content of the Utility Model

[0003] The purpose of the utility model is to address the problem in the background art that part of the LNG evaporates into gas, and this part of the evaporated gas is BOG. If the BOG is not processed in time, it will cause the pressure of the storage tank to rise and affect the safe operation of the storage tank, and propose an open cold insulation system for an LNG storage tank that recovers the cooling water heat quantity.

[0004] The technical solution of the utility model: An open cold insulation system for an LNG storage tank that recovers the cooling water heat quantity, comprising: an LNG storage tank for storing liquefied natural gas, the output end of the LNG storage tank is connected through a pipeline to a high-pressure pump; an open rack vaporizer arranged at the output end of the high-pressure pump for heat exchange with seawater, the output end of the open rack vaporizer is connected through a pipeline to a throttle valve; a cooling component fixedly arranged on the outer wall of the LNG storage tank for heat insulation, a driving component for driving the cooling component to rotate is arranged at the upper end of the LNG storage tank; a cofferdam is arranged around the LNG storage tank for preventing the cooling water flowing down along the outer wall surface of the LNG storage tank from overflowing.

[0005] Optionally, two groups of the cooling components are provided, which are respectively located at the top and middle of the outer wall of the LNG storage tank. The cooling component includes a plurality of support blocks fixedly arranged on the outer wall of the LNG storage tank. One end of the support block is provided with a sliding groove, a slider is slidably arranged inside the sliding groove, an annular pipe is fixedly arranged on the outer ring surface of the slider, a support rod is arranged between the annular pipes, a plurality of spray heads are connected and arranged at the bottom of the annular pipe, and the spray ports of the spray heads face the outer wall of the LNG storage tank. A spring hose is connected and arranged on the outer wall of the annular pipe, and one end of the spring hose is connected to a supply pump.

[0006] Optionally, the driving component includes a fixed block fixedly arranged on the upper surface of the LNG storage tank. One end of the fixed block is fixedly connected to a motor, the output end of the motor is fixedly connected to a gear, the inner ring surface of the slider is fixedly provided with an arc-shaped rack, and the arc-shaped rack is meshed with the gear.

[0007] Optionally, the throttle valve is a two-way setting. One end of the throttle valve communicates with the sea, and the other end of the throttle valve is communicated with the supply pump through a pipeline.

[0008] Optionally, a discharge pipe is arranged through the bottom surface of the cofferdam, and one end of the discharge pipe is communicated with the cofferdam and leads to the sea.

[0009] Optionally, the chute and the slider are arranged in a "T" shape.

[0010] In summary, the present application includes at least one of the following beneficial technical effects of the open-type cold insulation system for LNG storage tanks for recovering the cooling water cooling capacity:

[0011] In the present utility model, seawater exchanges heat with LNG in the open rack vaporizer to form low-temperature cooling water, which is transported to the annular pipes fixed on the top and middle of the LNG storage tank through a supply pump. A spray head is used to spray the cooling water onto the outer wall surface of the LNG storage tank to cool the outer wall surface of the LNG storage tank, maintain the outer wall surface of the LNG storage tank at a relatively low temperature, thereby reducing the evaporation amount of BOG inside the LNG storage tank, avoiding the increase of the internal pressure of the LNG storage tank, and ensuring the safe operation of the LNG storage tank;

[0012] Furthermore, in the present utility model, the motor drives the gear to rotate, and the gear drives the spray head at the bottom of the arc-shaped rack to rotate around the LNG storage tank through the arc-shaped rack, so that the spray head can evenly spray the cooling water on the outer wall of the LNG storage tank, helping to reduce the temperature of the outer surface of the LNG storage tank, thereby reducing the heat transfer to the inside of the LNG storage tank and maintaining the internal low-temperature state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A structural schematic diagram of an open-type cold insulation system for an LNG storage tank for recovering the cooling water cooling capacity of the present utility model is given;

[0014] Figure 2 For Figure 1 the structural schematic diagram of the LNG storage tank in;

[0015] Figure 3 For Figure 2 the structural schematic diagram of the cooling component in;

[0016] Figure 4 For Figure 3 the split structural schematic diagram of.

[0017] Reference numerals:

[0018] 1. LNG storage tank; 2. High-pressure pump; 3. Open rack vaporizer; 4. Shut-off valve;

[0019] 5. Cooling assembly; 51. Support block; 52. Chute; 53. Slide block; 54. Annular pipe; 55. Support rod; 56. Spray head; 57. Spring hose; 58. Supply pump;

[0020] 6. Driving assembly; 61. Fixed block; 62. Motor; 63. Gear; 64. Arc rack;

[0021] 7. Cofferdam; 8. Discharge pipe. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively with reference to the relevant accompanying drawings. Several embodiments of the present utility model are given in the accompanying drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used herein in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] Embodiment

[0027] As Figure 1 and Figure 2As shown in the figure, an open-type cold insulation system for an LNG storage tank that recovers and cools the cooling water volume proposed by the present utility model includes: an LNG storage tank 1 for storing liquefied natural gas, and a plurality of stainless-steel support feet are fixedly arranged at the bottom of the LNG storage tank 1. The use of stainless-steel material avoids being eroded by contact with seawater and increases the service life. The output end of the LNG storage tank 1 is connected through a pipeline to a high-pressure pump 2 for boosting the liquefied natural gas into gaseous natural gas; an open-frame vaporizer 3 arranged at the output end of the high-pressure pump 2 for heat exchange with seawater. The open-frame vaporizer 3 is a prior art, and the seawater is cooled by natural gas entering the cooling pipe, which will not be described here. The output end of the open-frame vaporizer 3 is connected through a pipeline to a throttle valve 4, which can control the discharge direction of seawater; a cooling component 5 fixedly arranged on the outer wall of the LNG storage tank 1 for heat insulation, which is convenient for keeping the inside of the LNG storage tank 1 at a low temperature. A driving component 6 for driving the cooling component 5 to rotate is arranged at the upper end of the LNG storage tank 1, which can make the sprayed cooling water of the cooling component 5 more uniform; a cofferdam 7 is arranged around the LNG storage tank 1 for preventing the cooling water flowing down along the outer wall surface of the LNG storage tank 1 from overflowing, which is convenient for centralized collection of seawater.

[0028] As Figures 2 to 4 shown, two groups of cooling components 5 are provided, which are respectively located at the top and middle of the outer wall of the LNG storage tank 1, which can make the temperature of the sprayed cooling water more uniform. The cooling component 5 includes a plurality of support blocks 51 fixedly arranged on the outer wall of the LNG storage tank 1. One end of the support block 51 is provided with a chute 52, and a slider 53 is slidably arranged inside the chute 52. The slider 53 is arranged in a ring structure, which can stably support the slider 53 and can also make the slider 53 rotate. The outer ring surface of the slider 53 is fixedly provided with an annular pipe 54, and the annular pipe 54 is sleeved on the outer wall of the LNG storage tank 1. A support rod 55 is arranged between the annular pipes 54, which can drive the two annular pipes 54 to rotate simultaneously. The bottom of the annular pipe 54 is connected to a plurality of nozzles 56, and the spray ports of the nozzles 56 face the outer wall of the LNG storage tank 1, which can spray the cooling water on the outer wall of the LNG storage tank 1 more uniformly. A spring hose 57 is connected to the outer wall of the annular pipe 54, which can make the annular pipe 54 unrestricted during rotation. One end of the spring hose 57 is connected to a supply pump 58, which is convenient for introducing the cooled seawater into the annular pipe 54.

[0029] As Figure 2 shown, the driving component 6 includes a fixed block 61 fixedly arranged on the upper surface of the LNG storage tank 1. One end of the fixed block 61 is fixedly connected to a motor 62, which can stably install the motor 62. The output end of the motor 62 is fixedly connected to a gear 63. An arc-shaped rack 64 is fixedly arranged on the inner ring surface of the slider 53. The arc-shaped rack 64 is meshed with the gear 63, which can drive the annular pipe 54 to rotate in a small amplitude in a cycle, making the nozzles 56 on the annular pipe 54 spray more uniformly.

[0030] Further, the shut-off valve 4 is a two-way setting. One end of the shut-off valve 4 communicates with the sea, and the other end of the shut-off valve 4 is connected to the supply pump 58 through a pipeline, facilitating the stable transmission of seawater.

[0031] Secondly, a discharge pipe 8 is penetrated through the bottom surface of the cofferdam 7. One end of the discharge pipe 8 communicates with the cofferdam 7 and leads to the sea, facilitating the discharge of the used seawater into the sea.

[0032] Furthermore, the chute 52 and the slider 53 are arranged in a "T" shape, which can make the connection between the chute 52 and the slider 53 more stable and drive the rotation of the annular pipe 54 more stably.

[0033] The working principle of this embodiment is as follows: The low-temperature liquefied natural gas in the LNG storage tank 1 is boosted to gaseous natural gas by the high-pressure pump 2. The gaseous natural gas enters the open rack vaporizer 3 and contacts with seawater inside the open rack vaporizer 3, enabling the gaseous natural gas to absorb the heat of the seawater, forming cooling water from the seawater, and turning into liquid natural gas after the gaseous natural gas absorbs heat. Subsequently, the cooled seawater is transmitted to the supply pump 58 through the shut-off valve 4. The cooling water is pressurized and transmitted into the spring hose 57 by the supply pump 58, enters the annular pipe 54 from the spring hose 57, and the cooling water is sprayed on the outer wall of the LNG storage tank 1 through a plurality of nozzles 56 at the bottom of the annular pipe 54.

[0034] During the spraying process of the nozzle 56, the motor 62 is started. The output end of the motor 62 drives the gear 63 to rotate. The gear 63 drives the arc-shaped rack 64 to rotate. The arc-shaped rack 64 drives the slider 53 to rotate in a small amplitude in a circular motion within the chute 52 on the support block 51. The slider 53 drives the plurality of nozzles 56 on the annular pipe 54 to rotate in a circular motion. At the same time, the annular pipe 54 drives the nozzles 56 on the annular pipe 54 in the middle of the LNG storage tank 1 to rotate in a small amplitude in a circular motion through the support rod 55, so as to evenly spray the cooling water on the outer wall of the LNG storage tank 1, helping to reduce the temperature of the outer surface of the LNG storage tank 1, thereby reducing the heat transfer to the inside of the LNG storage tank 1 and maintaining a low-temperature state inside.

[0035] The cooling water sprayed by the nozzle 56 flows down along the outer wall of the LNG storage tank 1 into the inside of the cofferdam 7 and is discharged into the sea through the discharge pipe 8.

[0036] The above specific embodiments are only several alternative embodiments of the present invention. Based on the technical solution of the present invention and the relevant revelations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An open cold insulation system for an LNG storage tank that recovers the cooling water volume of cooling water, characterized in that, Including: An LNG storage tank (1) for storing liquefied natural gas, the output end of the LNG storage tank (1) is connected with a high-pressure pump (2) through a pipeline; An open rack vaporizer (3) arranged at the output end of the high-pressure pump (2) for heat exchange with seawater, the output end of the open rack vaporizer (3) is connected with a throttle valve (4) through a pipeline; A cooling component (5) fixedly arranged on the outer wall of the LNG storage tank (1) for heat insulation, a driving component (6) for driving the cooling component (5) to rotate is arranged at the upper end of the LNG storage tank (1); A cofferdam (7) is arranged around the LNG storage tank (1) to prevent the cooling water flowing down along the outer wall surface of the LNG storage tank (1) from overflowing.

2. The open cold insulation system for LNG storage tank that recovers the cooling water quantity of cooling water according to claim 1, wherein: Two groups of the cooling components (5) are arranged, respectively located at the top and the middle of the outer wall of the LNG storage tank (1). The cooling component (5) includes a plurality of support blocks (51) fixedly arranged on the outer wall of the LNG storage tank (1). One end of the support block (51) is provided with a chute (52). A slider (53) is slidably arranged inside the chute (52). An annular pipe (54) is fixedly arranged on the outer ring surface of the slider (53). A support rod (55) is arranged between the annular pipes (54). A plurality of spray nozzles (56) are communicated and arranged at the bottom of the annular pipe (54), and the spray ports of the spray nozzles (56) face the outer wall of the LNG storage tank (1). A spring hose (57) is communicated and arranged on the outer wall of the annular pipe (54). One end of the spring hose (57) is connected with a supply pump (58).

3. The open-type cold insulation system for LNG storage tank that recovers the cooling water quantity of cooling water according to claim 2, wherein: The driving component (6) includes a fixed block (61) fixedly arranged on the upper surface of the LNG storage tank (1). One end of the fixed block (61) is fixedly connected with a motor (62). The output end of the motor (62) is fixedly connected with a gear (63). An arc-shaped rack (64) is fixedly arranged on the inner ring surface of the slider (53). The arc-shaped rack (64) is meshed and connected with the gear (63).

4. The open-type cold insulation system for an LNG storage tank that recovers the cooling water quantity of the cooling water according to claim 2, characterized in that: The throttle valve (4) is arranged in a two-way manner. One end of the throttle valve (4) is communicated with the sea, and the other end of the throttle valve (4) is communicated with the supply pump (58) through a pipeline.

5. The open cold insulation system for LNG storage tank that recovers the cooling water quantity of cooling water according to claim 1, characterized in that: A discharge pipe (8) is arranged through the bottom surface of the cofferdam (7), and one end of the discharge pipe (8) is communicated with the cofferdam (7) and leads to the sea.

6. The open-type cold insulation system for LNG storage tank that recovers the cooling water quantity of cooling water according to claim 2, wherein: The chute (52) and the slider (53) are arranged in a "T" shape structure.

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