Liquefied natural gas vaporization apparatus

Abstract

The utility model relates to liquefied natural gas field, and disclose a kind of liquefied natural gas gasification equipment;Including fixed tank, the top of the fixed tank one side is welded with gasification tank, the inside welding of the fixed tank has outer coil pipe, the inside through -going of the outer coil pipe is provided with gasification coil pipe, the top of the gasification coil pipe is fixedly connected with gasification tank inside, the inside of the outer coil pipe and the outer surface of gasification coil pipe between filling has heat carrier oil, the bottom of the fixed tank inner chamber is bolted with electric heater. By filling heat carrier oil in the space between the inside of outer coil pipe and the outer surface of gasification coil pipe. Since heat carrier oil has good heat conduction performance, after electric heater heats heat carrier oil, heat carrier oil can uniformly heat liquefied natural gas in the inside of gasification coil pipe after heat absorption, improve liquefied natural gas gasification efficiency.

Description

Technical Field

[0001] This utility model relates to the field of liquefied natural gas, specifically to a liquefied natural gas gasification device. Background Technology

[0002] In the existing technology, natural gas is usually pressurized and liquefied for convenient transportation, so the liquefied natural gas needs to be gasified before use.

[0003] Currently, Chinese utility model patent CN222760710U discloses a liquefied natural gas (LNG) vaporization device. Existing LNG vaporization devices use heating to vaporize LNG; however, due to the poor heat conduction efficiency of air, the vaporization effect is generally limited for LNG located far from the heater within the coil. It only effectively vaporizes LNG closer to the heater coil, thus limiting its practicality. Furthermore, excessive LNG injected into the coil, or delayed or insufficient discharge of vaporized LNG, can lead to excessive pressure within the vaporization device, causing damage and increasing safety hazards. Utility Model Content

[0004] The purpose of this invention is to provide a liquefied natural gas (LNG) gasification device for existing equipment, which has the advantages of improving the gasification effect of LNG and preventing excessive gas pressure inside the device.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a liquefied natural gas gasification device, including a fixed tank, a gasification tank welded to one side of the top of the fixed tank, an outer coil welded inside the fixed tank, a gasification coil being installed through the inner part of the outer coil, the top end of the gasification coil being fixedly connected to the inner part of the gasification tank, a heat carrier oil being filled between the inner part of the outer coil and the outer surface of the gasification coil, and an electric heater being bolted to the bottom of the inner cavity of the fixed tank.

[0006] The above technical solution involves filling the space between the outer coil and the outer surface of the vaporization coil with heat carrier oil. Due to the excellent thermal conductivity of the heat carrier oil, after being heated by the electric heater, the oil absorbs heat and can uniformly heat the liquefied natural gas (LNG) inside the vaporization coil, improving LNG vaporization efficiency. By overcoming the spring force when the pressure inside the vaporization tank is too high, some natural gas can enter the storage tank for temporary storage. After the vaporization tank has finished supplying natural gas, the natural gas from the storage tank is pushed back into the vaporization tank. This allows for automatic pressure reduction when the pressure inside the vaporization tank is too high, improving the safety of LNG vaporization.

[0007] The present invention is further configured such that a fixed cylinder is welded to the top of the gasification tank, and a through hole communicating with the fixed cylinder is opened on the top of the gasification tank. A spring is bolted inside the fixed cylinder, and a first piston plate that is slidably connected to the bottom of the spring is fixedly connected to the bottom of the fixed cylinder. A gas storage tank that is fixedly connected to the fixed cylinder is bolted to the top of the fixed tank away from the gasification tank. A second piston plate is slidably connected inside the gas storage tank. A threaded rod that is threadedly connected to the gas storage tank is rotatably connected to the side of the second piston plate away from the gasification tank. A connecting valve pipe is fixedly connected between the gas storage tank and the gasification tank.

[0008] By adopting the above technical solution, the pressure inside the gasification tank can be automatically reduced when it is too high, thus preventing excessive pressure inside the equipment and improving the safety of liquefied natural gas gasification.

[0009] The present invention is further configured such that an air inlet valve pipe bolted to a fixed tank is fixedly connected to one end of the gasification coil away from the gasification tank, and an air outlet valve pipe is fixedly connected to the side of the gasification tank away from the gas storage tank.

[0010] The above technical solution involves injecting liquefied natural gas into the gasification coil through the inlet valve pipe and discharging the vaporized liquefied natural gas from the gasification tank through the outlet valve pipe.

[0011] The present invention is further configured such that a telescopic rod fixedly connected to the first piston plate is bolted inside the fixed cylinder, and the spring is sleeved on the surface of the telescopic rod.

[0012] The above technical solution is used to support and limit the up-and-down sliding of the first piston plate, thereby improving sliding stability.

[0013] The present invention is further configured such that the surfaces of the vaporization coil, the inlet valve pipe, the outlet valve pipe, and the threaded rod are all fitted with sealing rings that respectively engage with the interior of the fixed tank, the vaporization tank, and the gas storage tank.

[0014] The above technical solution improves the sealing of the gasification equipment and prevents natural gas from leaking out.

[0015] The present invention is further provided that an inspection door is bolted to one side of the surface of the fixed tank.

[0016] By adopting the above technical solution, the interior of the fixed tank can be opened by disassembling the inspection door, thereby allowing the electric heater to be repaired.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention fills the space between the inside of the outer coil and the outer surface of the gasification coil with heat carrier oil. Because heat carrier oil has excellent thermal conductivity, after being heated by the electric heater, the heat carrier oil absorbs heat and can evenly heat the liquefied natural gas inside the gasification coil, thereby improving the gasification efficiency of the liquefied natural gas.

[0019] This invention overcomes the spring force when the gas pressure inside the vaporizer is too high, allowing some natural gas to temporarily enter the storage tank for storage. After the vaporizer has finished supplying natural gas, the natural gas in the storage tank is pushed back into the vaporizer. This automatically reduces the pressure inside the vaporizer when it becomes too high, improving the safety of liquefied natural gas vaporization. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0022] Figure 3 This is a partial structural cross-sectional view of the present invention.

[0023] In the diagram: 1. Fixed tank; 2. External coil; 3. Vaporization coil; 4. Heat carrier oil; 5. Vaporization tank; 6. Through hole; 7. Spring; 8. First piston plate; 9. Fixed cylinder; 10. Gas storage tank; 11. Second piston plate; 12. Threaded rod; 13. Connecting valve pipe; 14. Electric heater; 15. Inlet valve pipe; 16. Outlet valve pipe; 17. Telescopic rod; 18. Sealing ring; 19. Inspection door. Detailed Implementation

[0024] 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.

[0025] Example 1:

[0026] refer to Figure 1 , Figure 2 , Figure 3A liquefied natural gas (LNG) vaporization device includes a fixed tank 1, a vaporization tank 5 welded to one side of the top of the fixed tank 1, an outer coil 2 welded inside the fixed tank 1, a vaporization coil 3 penetrating through the outer coil 2, and a fixed connection between the top end of the vaporization coil 3 and the interior of the vaporization tank 5. Heat carrier oil 4 is filled between the interior of the outer coil 2 and the outer surface of the vaporization coil 3. An electric heater 14 is bolted to the bottom of the inner cavity of the fixed tank 1. By filling the space between the interior of the outer coil 2 and the outer surface of the vaporization coil 3 with heat carrier oil 4, the device utilizes the excellent thermal conductivity of the heat carrier oil 4. Therefore, after the electric heater 14 heats the heat carrier oil 4, it can uniformly heat the LNG inside the vaporization coil 3, improving the LNG vaporization efficiency.

[0027] refer to Figure 1 A maintenance door 19 is bolted to one side of the surface of the fixed tank 1. The interior of the fixed tank 1 can be opened by removing the maintenance door 19, so as to perform maintenance on the electric heater 14.

[0028] Brief description of the usage process: First, liquefied natural gas is injected into the vaporization coil 3. Then, the electric heater 14 is turned on to heat the heat carrier oil 4 inside the outer coil 2. Because the heat carrier oil 4 has excellent thermal conductivity and is evenly filled in the space between the outer coil 2 and the outer surface of the vaporization coil 3, it can evenly heat the liquefied natural gas inside the vaporization coil 3. Finally, the vaporized natural gas is transferred to the vaporization tank 5 for storage through the vaporization coil 3.

[0029] Example 2:

[0030] refer to Figure 1 , Figure 2 A liquefied natural gas (LNG) vaporization device includes a vaporization tank 5 with a fixed cylinder 9 welded to its top. The top of the vaporization tank 5 has a through hole 6 communicating with the fixed cylinder 9. A spring 7 is bolted inside the fixed cylinder 9, and a first piston plate 8, which is slidably connected to the bottom of the spring 7, is fixedly connected to the fixed cylinder 9. A storage tank 10, which is fixedly connected to the fixed cylinder 9, is bolted to the top of the fixed tank 1 on the side away from the vaporization tank 5. A second piston plate 11 is slidably connected inside the storage tank 10, and a threaded rod 12, which is threadedly connected to the storage tank 10, is rotatably connected to the side of the second piston plate 11 away from the vaporization tank 5. A connecting valve pipe 13 is fixedly connected between the storage tank 10 and the vaporization tank 5. When the internal pressure of the vaporization tank 5 is too high, the spring force of the spring 7 is overcome, allowing some natural gas to enter the storage tank 10 for temporary storage. After the vaporization tank 5 has finished supplying natural gas, the natural gas in the storage tank 10 is pushed back into the vaporization tank 5. This allows for automatic pressure reduction when the internal pressure of the vaporization tank 5 is too high, improving the safety of LNG vaporization.

[0031] refer to Figure 1 , Figure 2 The end of the gasification coil 3 away from the gasification tank 5 is fixedly connected to an inlet valve pipe 15 bolted to the fixed tank 1. The side of the gasification tank 5 away from the gas storage tank 10 is fixedly connected to an outlet valve pipe 16. Liquefied natural gas is injected into the gasification coil 3 through the inlet valve pipe 15, and the liquefied natural gas vaporized inside the gasification tank 5 is discharged through the outlet valve pipe 16.

[0032] refer to Figure 2 The inside of the fixed cylinder 9 is bolted with a telescopic rod 17 that is fixedly connected to the first piston plate 8. The spring 7 is sleeved on the surface of the telescopic rod 17 to support and limit the up and down sliding of the first piston plate 8, thereby improving sliding stability.

[0033] refer to Figure 2 The surfaces of the gasification coil 3, the inlet valve pipe 15, the outlet valve pipe 16, and the threaded rod 12 are all fitted with sealing rings 18 that are respectively engaged with the inside of the fixed tank 1, the gasification tank 5, and the gas storage tank 10, thereby improving the sealing performance of the gasification equipment and preventing natural gas from leaking out.

[0034] Brief description of the operation: When the internal gas pressure inside the gasification tank 5 is too high, the pressure overcomes the elastic force of the spring 7, pushing the first piston plate 8 upward. This allows the gasified natural gas inside the gasification tank 5 to enter the fixed cylinder 9 through the through hole 6, and then into the storage tank 10 for storage. When some of the gasified natural gas inside the gasification tank 5 is discharged, the pressure decreases and can no longer overcome the elastic force of the spring 7. The first piston plate 8 then re-seals the top of the through hole 6. Simultaneously, by rotating the threaded rod 12, which engages with the threaded connection of the storage tank 10, the second piston plate 11 slides, opening the connecting valve pipe 13. This allows the natural gas stored in the storage tank 10 to be pushed into the gasification tank 5 after the natural gas inside the gasification tank 5 has been discharged, continuing the discharge process.

[0035] Although embodiments of the present invention 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 the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquefied natural gas vaporization device, comprising a fixed tank (1), characterized in that: A vaporization tank (5) is welded to one side of the top of the fixed tank (1). An outer coil (2) is welded inside the fixed tank (1). A vaporization coil (3) is installed through the inner part of the outer coil (2). The top end of the vaporization coil (3) is fixedly connected to the inner part of the vaporization tank (5). Heat carrier oil (4) is filled between the inner part of the outer coil (2) and the outer surface of the vaporization coil (3). An electric heater (14) is bolted to the bottom of the inner cavity of the fixed tank (1).

2. The liquefied natural gas gasification equipment according to claim 1, characterized in that: A fixed cylinder (9) is welded to the top of the gasification tank (5). A through hole (6) communicating with the fixed cylinder (9) is opened on the top of the gasification tank (5). A spring (7) is bolted inside the fixed cylinder (9). A first piston plate (8) is fixedly connected to the bottom of the spring (7) and is slidably connected to the fixed cylinder (9). A gas storage tank (10) is bolted to the side of the top of the fixed tank (1) away from the gasification tank (5) and is fixedly connected to the fixed cylinder (9). A second piston plate (11) is slidably connected inside the gas storage tank (10). A threaded rod (12) is rotatably connected to the side of the second piston plate (11) away from the gasification tank (5) and is threadedly connected to the gas storage tank (10). A connecting valve pipe (13) is fixedly connected between the gas storage tank (10) and the gasification tank (5).

3. The liquefied natural gas gasification equipment according to claim 2, characterized in that: The gasification coil (3) is fixedly connected to an air inlet valve pipe (15) bolted to the fixed tank (1) at one end away from the gasification tank (5), and the gasification tank (5) is fixedly connected to an air outlet valve pipe (16) on the side away from the gas storage tank (10).

4. The liquefied natural gas gasification equipment according to claim 2, characterized in that: The fixed cylinder (9) is bolted to the inside of a telescopic rod (17) that is fixedly connected to the first piston plate (8), and the spring (7) is sleeved on the surface of the telescopic rod (17).

5. A liquefied natural gas vaporization device according to claim 3, characterized in that: The surfaces of the vaporization coil (3), the inlet valve pipe (15), the outlet valve pipe (16), and the threaded rod (12) are all fitted with sealing rings (18) that respectively engage with the inside of the fixed tank (1), the vaporization tank (5), and the gas storage tank (10).

6. The liquefied natural gas vaporization equipment according to claim 1, characterized in that: An inspection door (19) is bolted to one side of the surface of the fixed tank (1).

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