Efficient heat exchange structure of LNG gasifier

Abstract

The utility model discloses an efficient heat exchange structure of an LNG (liquefied natural gas) vaporizer, which relates to the technical field of LNG vaporizers and comprises a heat exchange box, a feed pipe and a discharge pipe are respectively fixed on two sides of the top end of the heat exchange box, a first water inlet pipe and a first water outlet pipe are respectively fixed on two side walls of the heat exchange box, and a heat exchange coil pipe is arranged in the heat exchange box. A feeding port and a discharging port of the heat exchange coil pipe are in sealed butt joint with the bottom end of the feeding pipe and the bottom end of the discharging pipe through detachable butt joint mechanisms correspondingly. The feeding port and the discharging port in the two sides of the heat exchange coil pipe are fixed to the bottom end of the feeding pipe and the bottom end of the discharging pipe in a butt joint mode through the detachable butt joint mechanism, so that compared with a traditional bolt fixing mode, the heat exchange coil pipe is convenient to disassemble, assemble, replace, overhaul and maintain and convenient to use, the heat exchange bent pipe is arranged in the heat exchange coil pipe, and the heat exchange efficiency is improved. And the heat exchange box is matched to conduct dual heat exchange on the liquefied natural gas in the heat exchange coil pipe, the heat exchange efficiency of the liquefied natural gas can be effectively improved, and high practicability is achieved.

Description

Technical Field

[0001] This utility model relates to the field of LNG vaporizer technology, and in particular to a high-efficiency heat exchange structure for LNG vaporizer. Background Technology

[0002] An LNG vaporizer is a device that converts liquefied natural gas (LNG) from a liquid state to a gaseous state. It uses ambient heat or other heat sources to vaporize LNG, meeting the gas demand in industrial, civil and other fields. The working principle of an LNG vaporizer is to heat the liquid LNG, causing it to change from a liquid to a gaseous state. By rationally selecting heat exchange structures and materials, LNG vaporizers can efficiently and safely vaporize LNG, meeting the gas demand in different scenarios.

[0003] For example, utility model patent application number CN202121763152.9 discloses an LNG vaporizer, including a liquid tank and a water bath heat exchange device. The liquid tank is equipped with the water bath heat exchange device, which includes an LNG manifold, an NG manifold, and a water bath heat exchange tube bundle. The two ends of the water bath heat exchange tube bundle are respectively connected to the LNG manifold and the NG manifold. The water bath heat exchange tube bundle is composed of multiple heat exchange tubes arranged in an S-shaped meandering pattern in multiple layers. The heat exchange tubes are evenly distributed side by side in each layer.

[0004] Based on existing technologies, it has been found that most existing LNG vaporizer heat exchange structures are fixed, with heat exchange tubes typically bolted to the LNG inlet and outlet pipes. This makes it difficult to disassemble, replace, and maintain the heat exchange tubes, resulting in inconvenience in use. Furthermore, existing LNG vaporizer heat exchange structures are simple, and the heat exchange effect needs improvement, failing to achieve efficient heat exchange for LNG and thus lacking practicality. Therefore, this utility model proposes an efficient heat exchange structure for LNG vaporizers to solve the problems existing in the prior art. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to propose a high-efficiency heat exchange structure for LNG vaporizers. This solves the problem that existing high-efficiency heat exchange structures for LNG vaporizers generally use bolts to fix the heat exchange tubes to the liquefied natural gas inlet and outlet pipes, which makes it inconvenient to disassemble, replace, and maintain the heat exchange tubes, and the heat exchange effect needs to be improved, thus failing to achieve high-efficiency heat exchange for liquefied natural gas.

[0006] To achieve the purpose of this utility model, the utility model is implemented through the following technical solution: a high-efficiency heat exchange structure for an LNG vaporizer, including a heat exchange box, with an inlet pipe and an outlet pipe fixed on both sides of the top of the heat exchange box, and a first water inlet pipe and a first water outlet pipe fixed on both side walls of the heat exchange box, and a heat exchange coil provided inside the heat exchange box, with the inlet and outlet of the heat exchange coil being sealed and connected to the bottom ends of the inlet pipe and the outlet pipe respectively through a detachable docking mechanism, and a heat exchange bend provided inside the heat exchange coil, with a second water inlet pipe and a second water outlet pipe respectively sealed and connected to the heat exchange bend inside the inlet pipe and the outlet pipe, and the ends of the second water inlet pipe and the second water outlet pipe away from the heat exchange bend extending to the outside of the heat exchange box.

[0007] A further improvement is that temperature sensors are fixed to the inner walls of all four sides of the heat exchange box, and a control display screen is fixed to the front of the heat exchange box. The temperature sensors are electrically connected to the control display screen.

[0008] Further improvements include: the heat exchange bend and the heat exchange coil are fixedly connected by a support rib; the bottom ends of the second inlet pipe and the second outlet pipe are both fixed with a first sealing ring; and the inlet and outlet of the heat exchange bend are both provided with a first sealing groove that matches the first sealing ring.

[0009] A further improvement is that the detachable docking mechanism includes a threaded sleeve that is slidably sleeved on the lower part of the feed pipe and the discharge pipe, and an external thread that is opened on the outer side wall of the feed port and the discharge port of the heat exchange coil. The inner wall of the threaded sleeve near the heat exchange coil is provided with an internal thread that matches the external thread.

[0010] A further improvement is that: a limiting protrusion ring is fixed to the lower part of the outer wall of both the feed pipe and the discharge pipe, and a limiting groove adapted to the limiting protrusion ring is opened on the inner wall of the threaded sleeve.

[0011] A further improvement is that: both the inlet and outlet of the heat exchange coil are fixed with a second sealing ring, and the bottom of both the inlet pipe and the outlet pipe are provided with a second sealing groove that matches the second sealing ring.

[0012] A further improvement is that: a support spring is symmetrically fixed at the bottom of the heat exchange box, a support plate is fixed at the top of the support spring, and a support groove adapted to the heat exchange coil is opened at the top of the support plate.

[0013] The beneficial effects of this utility model are as follows: This utility model includes a heat exchange box, and the inlet and outlet ports on both sides of the heat exchange coil are respectively connected and fixed to the bottom of the inlet pipe and the outlet pipe through a detachable docking mechanism. This makes the heat exchange coil easier to disassemble, replace, and maintain compared to the traditional bolt fixing method, and it is convenient to use. In addition, by replacing the heat bending tube inside the heat exchange coil, it can cooperate with the heat exchange box to perform dual heat exchange on the liquefied natural gas in the heat exchange coil, which can effectively improve the heat exchange efficiency of liquefied natural gas and has high practicality. Attached Figure Description

[0014] Figure 1 This is a front view of the present invention;

[0015] Figure 2 This is a front sectional view of the present invention;

[0016] Figure 3 This is the utility model Figure 2 Enlarged view of point A in the image;

[0017] Figure 4 This is a front view of the heat exchange coil of this utility model;

[0018] Figure 5 This is a cross-sectional view of the heat exchanger coil of this utility model.

[0019] The components are: 1. Heat exchanger; 2. Feed pipe; 3. Discharge pipe; 4. First water inlet pipe; 5. First water outlet pipe; 6. Heat exchanger coil; 7. Heat exchanger bend; 8. Second water inlet pipe; 9. Second water outlet pipe; 10. Temperature sensor; 11. Control display screen; 12. Support rib; 13. First sealing ring; 14. First sealing groove; 15. Threaded sleeve; 16. External thread; 17. Limiting protrusion; 18. Limiting groove; 19. Second sealing ring; 20. Second sealing groove; 21. Support spring; 22. Support plate. Detailed Implementation

[0020] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0021] according to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, this embodiment provides a high-efficiency heat exchange structure for an LNG vaporizer, including a heat exchange box 1 made of protective insulation material, an inlet pipe 2 and an outlet pipe 3 that are fixed to the top of the heat exchange box 1 and have their own control valves. The heat exchange box 1 is used to contain hot water for heat exchange, the inlet pipe 2 is used to add liquefied natural gas, and the outlet pipe 3 is used to discharge vaporized natural gas. A first water inlet pipe 4 for injecting hot water for heat exchange is fixed to the upper part of the left side wall of the heat exchange box 1, and a first water outlet pipe for draining water is fixed to the lower part of the right side wall of the heat exchange box 1. Pipe 5, the heat exchange box 1 is equipped with a heat exchange coil 6 for heating and vaporizing liquefied natural gas and connecting with the feed pipe 2 and the discharge pipe 3. The left feed port and the right discharge port of the heat exchange coil 6 are sealed and connected to the feed pipe 2 and the discharge pipe 3 respectively through a detachable connection mechanism to achieve detachable installation. The feed port and discharge port on both sides of the heat exchange coil 6 are respectively connected and fixed to the bottom of the feed pipe 2 and the discharge pipe 3 through the detachable connection mechanism, so that the heat exchange coil 6 is easier to disassemble, replace and maintain than the traditional bolt fixing method.

[0022] The heat exchange coil 6 has a heat exchange bend 7 with a matching shape inside. The feed pipe 2 has a second water inlet pipe 8 that is sealed and connected to the left side of the heat exchange bend 7 inside. The discharge pipe 3 has a second water outlet pipe 9 that is sealed and connected to the right side of the heat exchange bend 7 inside. The end of the second water inlet pipe 8 away from the heat exchange bend 7 passes through the feed pipe 2 and the heat exchange box 1 and extends to the outside of the heat exchange box 1. The end of the second water outlet pipe 9 away from the heat exchange bend 7 passes through the discharge pipe 3 and the heat exchange box 1 and extends to the outside of the heat exchange box 1. Control valves are installed on the first water inlet pipe 4, the first water outlet pipe 5, the second water inlet pipe 8 and the second water outlet pipe 9. By replacing the heat exchange bend 7 inside the heat exchange coil 6, the liquefied natural gas in the heat exchange coil 6 can be subjected to dual heat exchange in conjunction with the heat exchange box 1, which can effectively improve the heat exchange efficiency of liquefied natural gas.

[0023] Temperature sensors 10 are fixed to the inner walls of the heat exchange box 1 on all four sides by bolts. These sensors are used to monitor the water temperature inside the heat exchange box 1 in real time. A control display screen 11 is fixed to the front of the heat exchange box 1 by screws. The temperature sensors 10 are connected to the PLC control system of the LNG vaporizer and are used to send the monitored water temperature value to the control display screen 11 for display by the user.

[0024] A support rib 12 is fixed to the outer wall of the heat exchanger bend 7. The end of the support rib 12 away from the heat exchanger bend 7 is fixed to the inner wall of the heat exchanger coil 6, thereby fixing the heat exchanger bend 7 inside the heat exchanger coil 6. The bottom ends of the second water inlet pipe 8 and the second water outlet pipe 9 are both fixed with a first sealing ring 13. The water inlets and outlets on the left and right sides of the heat exchanger bend 7 are provided with first sealing grooves 14, and the first sealing grooves 14 are adapted to the first sealing rings 13. When the heat exchanger coil 6 is connected with the feed pipe 2 and the discharge pipe 3, the first sealing ring 13 is embedded in the first sealing groove 14, thereby achieving a sealed connection between the heat exchanger bend 7 and the second water inlet pipe 8 and the second water outlet pipe 9.

[0025] The detachable connection mechanism includes a threaded sleeve 15 and an external thread 16. The threaded sleeve 15 has two sets and is slidably sleeved on the lower part of the feed pipe 2 and the discharge pipe 3, respectively. The external thread 16 is opened on the outer wall of the feed port and the discharge port of the heat exchange coil 6. The inner wall of the threaded sleeve 15 near the heat exchange coil 6 is provided with an internal thread that matches the external thread 16. First, connect the feed port and the discharge port on both sides of the heat exchange coil 6 to the bottom end of the feed pipe 2 and the discharge pipe 3, respectively. Then, screw the threaded sleeve 15 downwards onto the feed port and the discharge port of the heat exchange coil 6. Continue to screw downwards to drive the feed pipe 2 and the discharge pipe 3 to be tightly connected with the heat exchange coil 6, so as to realize the detachable installation of the heat exchange coil 6. Then, unscrew the threaded sleeve 15 from the heat exchange coil 6 to remove the heat exchange coil 6.

[0026] The lower part of the outer wall of the feed pipe 2 and the discharge pipe 3 are both fixed with limiting protrusion rings 17. The inner wall of the threaded sleeve 15 is provided with a limiting groove 18, and the limiting groove 18 is adapted to the limiting protrusion ring 17. Through the cooperation of the limiting protrusion ring 17 and the limiting groove 18, the threaded sleeve 15 is limited.

[0027] The top of the inlet and outlet ports on both sides of the heat exchange coil 6 are fixed with second sealing rings 19. The bottom of the inlet pipe 2 and the outlet pipe 3 are provided with second sealing grooves 20, and the second sealing grooves 20 are adapted to the second sealing rings 19 to achieve a sealed connection between the heat exchange coil 6 and the inlet pipe 2 and the outlet pipe 3.

[0028] Two sets of support springs 21 are symmetrically fixed at the bottom of the heat exchange box 1. The top of the two sets of support springs 21 are fixed together with a support plate 22. The top of the support plate 22 is provided with a support groove that is compatible with the heat exchange coil 6, which plays an auxiliary support role for the heat exchange coil 6.

[0029] In actual use, the high-efficiency heat exchange structure of this LNG vaporizer first injects hot water for heat exchange into the heat exchange box 1 and the heat exchange bend 7 through the first water inlet pipe 4 and the second water inlet pipe 8, respectively. Then, the liquefied natural gas (LNG) to be heated is injected into the heat exchange coil 6 through the feed pipe 2. The LNG entering the heat exchange coil 6 undergoes dual heat exchange with the hot water in the heat exchange box 1 and the hot water in the heat exchange bend 7, and is heated and converted into gasified natural gas (NG) and discharged from the discharge pipe 3, and transported to the corresponding external storage container. The hot water in the heat exchange box 1 is discharged from the first water outlet pipe 5, and the hot water in the heat exchange bend 7 is discharged from the second water outlet pipe 9, until the entire LNG vaporization process is completed.

[0030] When it is necessary to disassemble the heat exchange coil 6 for corresponding maintenance work, first open the heat exchange box 1 (in this embodiment, the heat exchange box 1 consists of a box body with a front opening and a box cover with a sealing cover on the front of the box body, and the box body and the box cover are fixed by bolts), so that the heat exchange coil 6 is exposed. Then, use the detachable docking mechanism to release the docking fixation between the heat exchange coil 6 and the feed pipe 2 and the discharge pipe 3, so that the heat exchange coil 6 together with the heat exchange bend 7 can be taken out and the corresponding maintenance work can be carried out. During installation, the detachable docking mechanism can be used again to dock and fix the heat exchange coil 6 with the feed pipe 2 and the discharge pipe 3.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency heat exchange structure for an LNG vaporizer, comprising a heat exchange box (1), characterized in that: The heat exchange box (1) has a feed pipe (2) and a discharge pipe (3) fixed on both sides of the top. The heat exchange box (1) has a first water inlet pipe (4) and a first water outlet pipe (5) fixed on both sides of the side walls. The heat exchange box (1) has a heat exchange coil (6) inside. The feed inlet and discharge outlet of the heat exchange coil (6) are sealed to the bottom of the feed pipe (2) and the discharge pipe (3) through a detachable docking mechanism. The heat exchange coil (6) has a heat exchange bend (7) inside. The feed pipe (2) and the discharge pipe (3) have a second water inlet pipe (8) and a second water outlet pipe (9) sealed to the heat exchange bend pipe (7) inside. The ends of the second water inlet pipe (8) and the second water outlet pipe (9) away from the heat exchange bend pipe (7) both extend to the outside of the heat exchange box (1).

2. The high-efficiency heat exchange structure for an LNG vaporizer according to claim 1, characterized in that: Temperature sensors (10) are fixed on the inner walls of all four sides of the heat exchange box (1), and a control display screen (11) is fixed on the front of the heat exchange box (1). The temperature sensors (10) are electrically connected to the control display screen (11).

3. The high-efficiency heat exchange structure for an LNG vaporizer according to claim 1, characterized in that: The heat exchange bend (7) and the heat exchange coil (6) are fixedly connected by a support rib (12). The bottom ends of the second water inlet pipe (8) and the second water outlet pipe (9) are both fixed with a first sealing ring (13). The water inlet and water outlet of the heat exchange bend (7) are both provided with a first sealing groove (14) that is compatible with the first sealing ring (13).

4. The high-efficiency heat exchange structure for an LNG vaporizer according to claim 1, characterized in that: The detachable docking mechanism includes a threaded sleeve (15) slidably sleeved on the lower part of the feed pipe (2) and the discharge pipe (3) and an external thread (16) opened on the outer wall of the feed port and the discharge port of the heat exchange coil (6). The inner wall of the threaded sleeve (15) near the heat exchange coil (6) is provided with an internal thread that matches the external thread (16).

5. The high-efficiency heat exchange structure for an LNG vaporizer according to claim 4, characterized in that: The lower part of the outer wall of the feed pipe (2) and the discharge pipe (3) are fixed with a limiting protrusion ring (17), and the inner wall of the threaded sleeve (15) is provided with a limiting groove (18) that matches the limiting protrusion ring (17).

6. The high-efficiency heat exchange structure for an LNG vaporizer according to claim 4, characterized in that: The inlet and outlet of the heat exchange coil (6) are both fixed with a second sealing ring (19), and the bottom ends of the inlet pipe (2) and the outlet pipe (3) are both provided with a second sealing groove (20) that is compatible with the second sealing ring (19).

7. The high-efficiency heat exchange structure for an LNG vaporizer according to claim 1, characterized in that: The heat exchange box (1) has symmetrically fixed support springs (21) at the bottom, and a support plate (22) is fixed at the top of the support springs (21). The top of the support plate (22) has a support groove that is compatible with the heat exchange coil (6).

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