Natural gas liquefaction heat exchanger

Abstract

The utility model belongs to the technical field of heat exchangers, and particularly relates to a natural gas liquefaction heat exchanger which comprises a tank body, a plurality of supporting legs are fixedly connected to the bottom end of the tank body, and the tank body comprises a stirring mechanism used for stirring, a cooling mechanism used for cooling and a pressure relief mechanism used for pressure relief. One side of the tank body is fixedly sleeved with a liquid inlet pipe; in the using process, heat conduction is further strengthened through the heat conduction pipes and the heat dissipation fins, heat of natural gas can be rapidly dissipated out, the liquefaction process of the natural gas is accelerated, the natural gas can be more effectively pushed to flow through the stirring blades which are arranged in a wave shape and incline by 45 degrees, and contact between the natural gas and a cooling component is increased; and the natural gas entering the tank body can be uniformly dispersed through the flow equalizing pipe, so that the distribution uniformity of the natural gas in the tank body is ensured, a good condition is provided for the subsequent cooling and liquefying process, and the liquefying quality and efficiency are favorably improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a natural gas liquefaction heat exchanger. Background Technology

[0002] Natural gas liquefaction heat exchangers are one of the key devices in the natural gas liquefaction process. They mainly utilize the evaporation and heat absorption of low-temperature refrigerants (such as propane and ethylene) within the heat exchanger to gradually lower the temperature of the natural gas to below its liquefaction temperature, thereby realizing the transformation of natural gas from a gaseous state to a liquid state. During this process, the efficient heat transfer of the heat exchanger allows the natural gas and refrigerant to exchange heat, while ensuring that the pressure, flow rate, and other parameters of the entire system are within a suitable range to ensure the stability and efficiency of the liquefaction process.

[0003] Patent CN218600114U discloses a heat exchanger for liquefied natural gas (LNG) production, relating to the field of heat exchanger technology. It includes a base, a pressure relief structure, and a stirring structure. A main body is mounted on the top of the base, and a cooling chamber is formed inside the main body. A discharge pipe is installed at the bottom of the cooling chamber, and a liquid outlet valve is installed at the bottom of the discharge pipe. The stirring structure is located inside the cooling chamber. An annular chamber is formed inside the main body outside the cooling chamber, and a cooling pipe is installed inside the annular chamber. A liquid outlet pipe is installed at the output end of the cooling pipe, and a liquid inlet pipe is installed at the input end of the cooling pipe. An air inlet pipe is installed at the middle of the top of the cooling chamber. This invention uses a slider to drive a pull rod, which in turn drives a rubber plug, causing the rubber plug to re-insert into the pressure relief pipe for sealing. This structure achieves pressure regulation inside the heat exchanger, preventing excessive pressure differences that could lead to danger.

[0004] During use, the aforementioned patent exhibits poor cooling and liquefaction effects, insufficient heat conduction enhancement, and heat exchange only occurs through the walls of the cooling chamber, potentially resulting in relatively low heat exchange efficiency and slow natural gas liquefaction speed. Furthermore, during prolonged use, the springs in the pressure relief mechanism, located within the internal cavity of the main body, are prone to elastic fatigue. This necessitates the opening of the main body and other components for replacement, leading to complex maintenance operations and high maintenance costs. Therefore, a new natural gas liquefaction heat exchanger is proposed for improvement. Utility Model Content

[0005] In order to overcome the defects of the prior art mentioned above, the inventors conducted in-depth research and, after a great deal of creative work, completed this utility model.

[0006] Specifically, the technical problem to be solved by this utility model is to provide a natural gas liquefaction heat exchanger to solve the current technical problems of poor cooling and liquefaction effect, insufficient heat transfer enhancement, and complex maintenance and operation of the pressure relief mechanism, resulting in high maintenance costs.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A natural gas liquefaction heat exchanger includes a tank body with several support legs fixedly connected to the bottom end of the tank body. The tank body includes a stirring mechanism for stirring, a cooling mechanism for cooling, and a pressure relief mechanism for depressurization.

[0009] A liquid inlet pipe is fixedly sleeved on one side of the tank body. A spiral cooling pipe is fixedly sleeved at one end of the liquid inlet pipe. The spiral cooling pipe is fixedly installed inside the side wall of the tank body. A liquid outlet pipe is fixedly sleeved at the bottom end of the spiral cooling pipe. Several heat conduction pipes are fixedly connected to the inner surface of the spiral cooling pipe. One end of each heat conduction pipe extends into the inside of the tank body and is fixedly sleeved with heat dissipation fins.

[0010] A motor is installed at the top of the tank. The output shaft of the motor is rotatably connected to an air inlet pipe through a belt drive assembly. A flow equalization pipe is fixedly sleeved on both sides of the bottom of the air inlet pipe. Several air outlet holes are opened on the bottom surface of the flow equalization pipe.

[0011] The bottom end of the air intake pipe is fixedly sleeved with a stirring shaft, and a number of stirring blades are fixedly connected to the outer surface of the stirring shaft. The stirring blades are arranged in a wavy shape and are inclined at a 45-degree angle.

[0012] As an improved technical solution, pressure relief pipes are symmetrically arranged at the top of the tank. A fixed seat is fixedly connected to one side of the pressure relief pipe. A movable plate is slidably connected to the inner wall of the fixed seat. The movable plate is provided with a sliding groove and a limiting groove.

[0013] As an improved technical solution, a first semicircular plate is rotatably connected to the inner wall of the pressure relief pipe, and a second semicircular plate is rotatably connected to the pivot of the first semicircular plate. The same end of the pivot of the first semicircular plate and the pivot of the second semicircular plate both penetrate the inner wall of the pressure relief pipe and are fixedly connected with a locking block.

[0014] As an improved technical solution, one end of the first semi-circular plate shaft is movably connected to the inner wall of the slide groove, and the locking block is movably connected to the inner wall of the limiting groove.

[0015] As an improved technical solution, a moving rod is fixedly connected to one end of the moving plate, and one end of the moving rod passes through the inner wall of the fixed base and is threadedly connected to a limit bolt.

[0016] As an improved technical solution, a spring is sleeved on the outer surface of one end of the moving rod that extends to the outside of the fixed seat. One end of the spring contacts the side wall of the fixed seat, and the other end of the spring contacts the inner side of the limiting bolt.

[0017] After adopting the above technical solution, the beneficial effects of this utility model are:

[0018] 1. In use, this utility model further enhances heat conduction through heat pipes and heat dissipation fins, which can quickly dissipate the heat of natural gas and accelerate the liquefaction process. The wavy and 45-degree inclined stirring blades can more effectively promote the flow of natural gas, increase the contact between natural gas and cooling components, and further improve the cooling and liquefaction effect. The flow equalization pipe can evenly disperse the natural gas entering the tank, ensuring the uniform distribution of natural gas in the tank and providing good conditions for the subsequent cooling and liquefaction process, which helps to improve the liquefaction quality and efficiency.

[0019] 2. In use, this utility model uses a pressure relief mechanism composed of a pressure relief pipe, a fixed base, a movable plate, a first semicircular plate, a second semicircular plate, a movable rod, a spring, a limiting bolt, and a locking block. When the spring is prone to elastic fatigue during long-term use, the movable rod and the limiting bolt place the spring outside the tank body, which facilitates maintenance and operation, allows for quick replacement, reduces manual labor intensity, and lowers maintenance costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of 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. Among them:

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a side view sectional structural diagram of the present invention.

[0023] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0024] Figure 4 This is an enlarged, disassembled structural diagram of the pressure relief mechanism in this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Tank body; 2. Support legs; 3. Stirring mechanism; 31. Motor; 32. Belt drive assembly; 33. Stirring shaft; 34. Stirring blades; 4. Air inlet pipe; 41. Flow equalization pipe; 5. Cooling mechanism; 51. Liquid inlet pipe; 52. Spiral cooling pipe; 53. Liquid outlet pipe; 54. Heat conduction pipe; 55. Heat dissipation fins; 6. Pressure relief mechanism; 61. Pressure relief pipe; 62. Fixed base; 63. Moving plate; 631. Slide groove; 632. Limiting groove; 64. First semicircular plate; 65. Second semicircular plate; 66. Moving rod; 67. Spring; 68. Limiting bolt; 69. Locking block. Detailed Implementation

[0027] 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.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0030] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] like Figure 1 and Figure 4 As shown in the figure, this embodiment provides a natural gas liquefaction heat exchanger, including a tank 1, with a plurality of support legs 2 fixedly connected to the bottom end of the tank 1. The tank 1 includes a stirring mechanism 3 for stirring, a cooling mechanism 5 for cooling, and a pressure relief mechanism 6 for pressure relief.

[0032] A liquid inlet pipe 51 is fixedly sleeved on one side of the tank body 1. A spiral cooling pipe 52 is fixedly sleeved at one end of the liquid inlet pipe 51. The spiral cooling pipe 52 is fixedly installed inside the side wall of the tank body 1. A liquid outlet pipe 53 is fixedly sleeved at the bottom end of the spiral cooling pipe 52. Several heat conduction pipes 54 are fixedly connected to the inner surface of the spiral cooling pipe 52. One end of the several heat conduction pipes 54 extends into the inside of the tank body 1 and is fixedly sleeved with heat dissipation fins 55.

[0033] A motor 31 is installed at the top of the tank body 1. The output shaft of the motor 31 is rotatably connected to the air inlet pipe 4 through the belt drive assembly 32. Both sides of the bottom of the air inlet pipe 4 are fixedly sleeved with flow equalization pipes 41. Several air outlet holes are opened on the bottom surface of the flow equalization pipe 41.

[0034] The bottom end of the air intake pipe 4 is fixedly sleeved with a stirring shaft 33. Several stirring blades 34 are fixedly connected to the outer surface of the stirring shaft 33. The stirring blades 34 are arranged in a wavy shape and are inclined at a 45-degree angle.

[0035] Specifically, firstly, refrigerant is introduced into the spiral cooling pipe 52 through the liquid inlet pipe 51. The refrigerant flows in the spiral cooling pipe 52 and cools the side wall of the tank 1. During the flow of the refrigerant in the spiral cooling pipe 52, the heat inside the tank 1 is absorbed and cooled through several heat conduction pipes 54. The heat dissipation fins 55 increase the heat dissipation area and can more efficiently dissipate the heat of the natural gas in the tank 1, thereby reducing the temperature of the natural gas and gradually achieving liquefaction.

[0036] Next, natural gas enters the flow equalization pipe 41 through the inlet pipe 4 and enters the tank 1 through the outlet. Then, the motor 31 is started, and its output shaft drives the inlet pipe 4 to rotate through the belt drive assembly 32. The inlet pipe 4 drives the flow equalization pipe 41 to rotate, which can make the natural gas more evenly dispersed in the tank 1. The stirring shaft 33 will rotate together with the inlet pipe 4. Several wave-shaped stirring blades 34 are set at a 45-degree angle. When rotating, they can fully stir the natural gas in the tank 1, making the distribution of natural gas more uniform and enhancing the heat exchange effect.

[0037] In a further embodiment, pressure relief pipes 61 are symmetrically arranged at the top of the tank body 1. A fixed base 62 is fixedly connected to one side of the pressure relief pipe 61. A movable plate 63 is slidably connected to the inner wall of the fixed base 62. The movable plate 63 has a sliding groove 631 and a limiting groove 632 respectively opened inside. A first semicircular plate 64 is rotatably connected to the inner wall of the pressure relief pipe 61. A second semicircular plate 65 is rotatably connected to the pivot of the first semicircular plate 64. The same end of the pivot of the first semicircular plate 64 and the pivot of the second semicircular plate 65 both pass through the inner wall of the pressure relief pipe 61 and are fixed. A locking block 69 is fixedly connected. One end of the first semicircular plate 64 is movably connected to the inner wall of the slide groove 631. The locking block 69 is movably connected to the inner wall of the limiting groove 632. One end of the movable plate 63 is fixedly connected to a movable rod 66. One end of the movable rod 66 passes through the inner wall of the fixed seat 62 and is threadedly connected to a limiting bolt 68. A spring 67 is sleeved on the outer surface of the end of the movable rod 66 that extends to the outside of the fixed seat 62. One end of the spring 67 contacts the side wall of the fixed seat 62, and the other end of the spring 67 contacts the inner side of the limiting bolt 68.

[0038] Specifically, when the pressure inside tank 1 is normal, spring 67 is in its normal state, and moving plate 63 is in its initial position under the action of spring 67. At this time, the first semicircular plate 64 and the second semicircular plate 65 are in contact with each other, sealing the pressure relief pipe 61 to prevent natural gas leakage;

[0039] When natural gas liquefies upon cooling inside tank 1, the pressure in pressure relief pipe 61 will decrease. At this time, a pressure difference is generated between the inside of tank 1 and the outside. Excessive pressure pushes the first semicircular plate 64 and the second semicircular plate 65 to rotate around the axis, causing the first semicircular plate 64 and the second semicircular plate 65 to open, thereby allowing outside gas to enter the inside of tank 1 through pressure relief pipe 61 and reducing its internal pressure.

[0040] During the rotation of the first semicircular plate 64 and the second semicircular plate 65, the locking block 69 at one end of it will rotate. During the rotation of the locking block 69, the moving plate 63 will move outward of the fixed seat 62. The moving plate 63 will drive the moving rod 66 and the limiting bolt 68 to move, and cause the spring 67 to contract.

[0041] When the pressure returns to normal, the elastic force of the spring 67 pushes the moving plate 63 back to its initial position, and at the same time, it causes the first semicircular plate 64 and the second semicircular plate 65 to come into contact again, sealing the pressure relief pipe 61 and preventing natural gas from continuing to leak.

[0042] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A natural gas liquefaction heat exchanger, comprising a tank (1), characterized in that: The tank (1) has several support legs (2) fixedly connected to its bottom end. The tank (1) includes a stirring mechanism (3) for stirring, a cooling mechanism (5) for cooling, and a pressure relief mechanism (6) for pressure relief. A liquid inlet pipe (51) is fixedly sleeved on one side of the tank (1). A spiral cooling pipe (52) is fixedly sleeved at one end of the liquid inlet pipe (51). The spiral cooling pipe (52) is fixedly installed inside the side wall of the tank (1). A liquid outlet pipe (53) is fixedly sleeved at the bottom end of the spiral cooling pipe (52). Several heat conduction pipes (54) are fixedly connected to the inner surface of the spiral cooling pipe (52). One end of several heat conduction pipes (54) extends into the inside of the tank (1) and is fixedly sleeved with heat dissipation fins (55). The top of the tank (1) is equipped with a motor (31), and the output shaft of the motor (31) is rotatably connected to an air inlet pipe (4) through a belt drive assembly (32). Both sides of the bottom of the air inlet pipe (4) are fixedly sleeved with flow equalization pipes (41), and the bottom surface of the flow equalization pipe (41) is provided with several air outlet holes. The bottom end of the air intake pipe (4) is fixedly sleeved with a stirring shaft (33), and a number of stirring blades (34) are fixedly connected to the outer surface of the stirring shaft (33). The number of stirring blades (34) are arranged in a wave shape and are arranged at an inclination of 45 degrees.

2. A natural gas liquefaction heat exchanger according to claim 1, characterized in that: The tank body (1) is symmetrically provided with pressure relief pipes (61) at the top. A fixed seat (62) is fixedly connected to one side of the pressure relief pipe (61). A movable plate (63) is slidably connected to the inner wall of the fixed seat (62). A sliding groove (631) and a limiting groove (632) are respectively opened inside the movable plate (63).

3. A natural gas liquefaction heat exchanger according to claim 2, characterized in that: The inner wall of the pressure relief pipe (61) is rotatably connected to a first semicircular plate (64), and a second semicircular plate (65) is rotatably connected to the pivot of the first semicircular plate (64). The pivots of the first semicircular plate (64) and the second semicircular plate (65) both pass through the inner wall of the pressure relief pipe (61) and are fixedly connected to a locking block (69).

4. A natural gas liquefaction heat exchanger according to claim 3, characterized in that: One end of the first semicircular plate (64) is movably connected to the inner wall of the slide groove (631), and the locking block (69) is movably connected to the inner wall of the limiting groove (632).

5. A natural gas liquefaction heat exchanger according to claim 2, characterized in that: One end of the movable plate (63) is fixedly connected to a movable rod (66), and one end of the movable rod (66) passes through the inner wall of the fixed base (62) and is threadedly connected to a limit bolt (68).

6. A natural gas liquefaction heat exchanger according to claim 5, characterized in that: A spring (67) is fitted on the outer surface of one end of the movable rod (66) extending to the outside of the fixed seat (62). One end of the spring (67) is in contact with the side wall of the fixed seat (62), and the other end of the spring (67) is in contact with the inside of the limiting bolt (68).

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