Heat exchange tube, gasification device and machining die

Abstract

The utility model belongs to the technical field of vaporizer parts, and discloses a heat exchange tube, a vaporizing device and a machining die. The heat exchange tube comprises a tube body, a through hole is formed in the tube body, a to-be-gasified part circulates in the through hole, and seawater circulates on the periphery of the tube body so as to gasify the to-be-gasified part; a plurality of annular interference structures are arranged on the peripheral face of the pipe body at intervals in the axis direction of the pipe body so as to disturb water flow. An anti-icing layer is further arranged on the peripheral face of the pipe body and used for reducing adhesion of ice crystals. According to the heat exchange tube, the adhesive force of ice crystals on the surface of the heat exchange tube can be reduced, the service life of the heat exchange tube is effectively prolonged, flowing of seawater is affected, and forming of a water film is destroyed.

Description

Technical Field

[0001] The utility model relates to the technical field of parts of a vaporizer, in particular to a heat exchange tube, a vaporization device and a processing die. Background Technique

[0002] Liquefied Natural Gas (LNG) is a combustible gas in which natural gas is liquefied under low temperature and pressure. When using LNG, it is often vaporized by a vaporizer and then transported to various demand positions for use. At present, an Open Rack Vaporiser (ORV) is often used, which is a device that uses seawater to heat and vaporize LNG. During operation, seawater flows down along the heat exchange tube from the top and exchanges heat with the LNG flowing in the opposite direction inside the tube.

[0003] There are many problems with the existing ORV, which mainly include: 1. After the ORV works for a period of time, ice layers are easily accumulated and condensed at the bottom of the heat exchange tube through fine ice crystals, resulting in an increase in thermal resistance and a decrease in heat transfer effect, thus affecting the performance of the ORV. Therefore, it is necessary to detect the ice layer thickness during operation for a long time and stop the machine to remove ice when necessary. 2. In the upper section of the heat exchange tube, that is, the LNG gas outlet end, the seawater flow rate is small, resulting in a thick water film, a stable boundary layer structure, a large heat transfer thermal resistance, and a poor heat transfer effect. These problems mentioned above affect the heat exchange effect of the ORV on LNG and its own service life, and increase the maintenance frequency.

[0004] On this basis, a star-shaped heat exchange tube is also designed in the existing technology to increase the heat exchange area per unit length inside and outside the heat exchange tube, with good heat transfer effect and high pressure resistance. However, it still cannot solve the above two main problems. Therefore, two ORVs are often set up and the ice layer thickness is monitored or inspected at all times. Before the ice layer thickness reaches the warning line, the operation of the current ORV is ended and switched to the standby ORV for operation; and the previous ORV is maintained. The operation is complex and the cost is high, but there is still no mature solution for the second problem.

[0005] Therefore, there is an urgent need for a heat exchange tube to solve the above technical problems. Content of the Utility Model

[0006] An object of the utility model is to provide a heat exchange tube, which can reduce the adhesion of ice crystals on the surface of the heat exchange tube, effectively extend the service life of the heat exchange tube, and affect the seawater flow and destroy the formation of the water film.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The heat exchange tube includes a tube body. A through hole is provided in the tube body, and a component to be vaporized flows through the through hole. Seawater flows outside the tube body to vaporize the component to be vaporized. Among them, a plurality of annular interference structures are provided at intervals along the axial direction of the outer peripheral surface of the tube body to disturb the water flow. An anti-icing layer is further provided on the outer peripheral surface of the tube body, and the anti-icing layer is used to reduce the adhesion of ice crystals.

[0009] Optionally, the tube body includes a base body and outer fins, and a plurality of outer fins are circumferentially distributed on the outer periphery of the base body.

[0010] Optionally, a plurality of inner fins are circumferentially distributed on the inner wall of the through hole.

[0011] Optionally, the cross-sectional shape of the inner fin is wavy.

[0012] Optionally, the annular interference structure is a groove structure and / or a protrusion structure.

[0013] Optionally, the anti-icing layer is a superhydrophobic layer.

[0014] Optionally, the anti-icing layer is formed by spraying, depositing or etching on the outer peripheral surface of the tube body.

[0015] Optionally, along the direction from the upper part to the lower part of the tube body, the distance between two adjacent annular interference structures is increased.

[0016] The beneficial effects of the heat exchange tube of the present utility model are as follows: By providing a plurality of annular interference structures on the outer periphery of the tube body of the heat exchange tube, in the seawater flow direction, due to the interference of the annular interference structures on the outer periphery of the tube body, the stable seawater boundary layer structure will be intermittently destroyed, effectively reducing the formation of a stable seawater film. As a result, the seawater in heat exchange connection with the tube body is continuously updated and changed, and the contact area between the seawater and the tube body is increased, improving the heat exchange effect between the seawater and the tube body. At the same time, the scouring ability of the seawater on the ice crystals is increased, and the adhesion ability of the ice crystals is reduced. Moreover, the outer peripheral surface of the tube body is provided with an anti-icing layer, which further increases the anti-icing ability of the outer peripheral surface of the heat exchange tube, thereby reducing the adhesion ability of the ice crystals on the outer peripheral surface of the heat exchange tube. Through the above two measures, the icing degree of the heat exchange tube is greatly slowed down, the service life of the heat exchange tube is effectively extended, and the maintenance frequency is reduced.

[0017] Another object of the present utility model is to provide a vaporization device, including the heat exchange tube according to any of the above solutions, which can reduce the adhesion force of ice crystals on the surface of the heat exchange tube, effectively extend the service life of the heat exchange tube, and affect the seawater flow and destroy the formation of the water film.

[0018] Another object of the present utility model is to provide a processing mold, which can realize the processing and forming of a heat exchange tube, and has high forming efficiency.

[0019] To achieve this object, the present utility model adopts the following technical solutions:

[0020] A processing mold for forming the above-mentioned heat exchange tube, the processing mold includes:

[0021] An upper mold is provided with a plurality of flow channels for supplying the material to be formed to flow through; a mold core is provided at the bottom of the upper mold, and the shape of the mold core is the same as the shape of the through hole of the heat exchange tube;

[0022] A middle mold is fixedly connected to the bottom of the upper mold. The middle mold is provided with an extrusion cavity, and the extrusion cavity is sleeved on the outer periphery of the mold core. The shape of the extrusion cavity is the same as the shape of the outer peripheral surface of the heat exchange tube, and the material to be formed flows between the inner wall of the extrusion cavity and the outer peripheral wall of the mold core;

[0023] A lower mold is detachably provided at the bottom of the middle mold. The lower mold is provided with a forming cavity, and the shape of the forming cavity is the same as the shape of the outer peripheral surface of the heat exchange tube. An annular protrusion is provided on the inner wall of the forming cavity, and the lower mold can be opened and closed to process the grooved annular interference structure.

[0024] The beneficial effect of the processing mold of the present utility model: When processing the heat exchange tube, the material to be formed flows through the flow channel to between the inner wall of the extrusion cavity and the outer peripheral wall of the mold core for extrusion forming into a semi-finished heat exchange tube. The semi-finished heat exchange tube continues to move. By the intermittent opening and closing of the lower mold, the annular protrusion can perform forming processing on the outer peripheral surface of the semi-finished heat exchange tube to form a grooved annular interference structure arranged at intervals, thereby realizing the processing and forming of the entire heat exchange tube and improving the processing efficiency of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an axonometric view of the heat exchange tube provided by the specific embodiment of the present utility model;

[0026] Figure 2 is a top view of the heat exchange tube provided by the specific embodiment of the present utility model;

[0027] Figure 3 is a sectional view of the heat exchange tube provided by the specific embodiment of the present utility model;

[0028] Figure 4 is Figure 3 a partial enlarged view at A in

[0029] Figure 5 is a schematic diagram of the principle of the heat exchange tube provided by the specific embodiment of the present utility model for damaging the seawater film and ice crystals;

[0030] Figure 6 is an axonometric view of the processing die provided by the specific embodiment of the present utility model;

[0031] Figure 7 is an axonometric view of a partial section of the processing die provided by the specific embodiment of the present utility model in the processing state;

[0032] Figure 8 is an axonometric view of the upper die provided by the specific embodiment of the present utility model;

[0033] Figure 9 is an axonometric view of the middle die provided by the specific embodiment of the present utility model;

[0034] Figure 10 is an axonometric view of the lower die provided by the specific embodiment of the present utility model.

[0035] In the figure:

[0036] 10, pipe body; 101, through hole; 102, annular interference structure; 11, base body; 12, outer fin; 13, inner fin;

[0037] 100, upper die; 110, flow channel; 120, die core;

[0038] 200, middle die; 210, extrusion cavity;

[0039] 300, lower die; 301, forming cavity; 302, annular protrusion; 310, half die;

[0040] 1, material to be formed; 2, semi-finished heat exchange tube; 3, ice crystal; 4, seawater film. Specific Embodiment

[0041] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the accompanying drawings.

[0042] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] Next, refer to Figures 1 to 10 to introduce the heat exchange tube, vaporizer and processing die provided by the present utility model.

[0046] Please refer to Figures 1 to 5 , this embodiment provides a heat exchange tube, which includes a tube body 10. A through hole 101 is formed in the tube body 10, and a to-be-vaporized component flows through the through hole 101. Seawater flows on the outer periphery of the tube body 10 to vaporize the to-be-vaporized component. Wherein, a plurality of annular interference structures 102 are arranged at intervals along the axial direction of the outer peripheral surface of the tube body 10 to disturb the water flow. An anti-icing layer is further arranged on the outer peripheral surface of the tube body 10, and the anti-icing layer is used to reduce the adhesion of ice crystals 3.

[0047] In the heat exchange tube of this embodiment, a plurality of annular interference structures 102 are formed on the outer periphery of its own tube body 10. In the seawater flow direction, due to the interference of the annular interference structures 102 on the outer periphery of the tube body 10 being disrupted, the stable seawater boundary layer structure will be intermittently destroyed, effectively reducing the formation of the stable seawater film 4. As a result, the seawater heat-exchange connected to the tube body 10 is continuously updated and changed, and the contact area between the seawater and the tube body 10 is increased, improving the heat exchange effect between the seawater and the tube body 10. At the same time, the scouring ability of the seawater on the ice crystals 3 is increased, and the adhesion ability of the ice crystals 3 is reduced. Moreover, the outer peripheral surface of the tube body 10 is provided with an anti-icing layer, which further increases the anti-icing ability of the outer peripheral surface of the heat exchange tube, thereby reducing the adhesion ability of the ice crystals 3 on the outer peripheral surface of the heat exchange tube. Through the above two measures, the icing degree of the heat exchange tube is greatly slowed down, the service life of the heat exchange tube is effectively prolonged, and the maintenance frequency is reduced.

[0048] In some embodiments, the tube body 10 includes a base body 11 and outer fins 12. A plurality of outer fins 12 are circumferentially distributed on the outer periphery of the base body 11. Such a setting increases the contact area between the heat exchange tube and seawater, thereby increasing the heat exchange area of the heat exchange tube and improving the heat exchange effect of the heat exchange tube.

[0049] In some embodiments, a plurality of inner fins 13 are circumferentially distributed on the inner wall of the through hole 101, increasing the contact area between the heat exchange tube and LNG, thereby increasing the heat exchange effect of LNG.

[0050] Optionally, the cross-sectional shape of the inner fin 13 is wavy. Such a setting not only increases the heat exchange area but also enhances the turbulent flow effect of LNG in the through hole 101, thereby better improving the heat exchange efficiency and heat exchange amount of the heat exchange tube for LNG.

[0051] In some embodiments, the annular interference structure 102 is a groove structure and / or a protrusion structure, both of which can achieve the interference and destruction effect on the seawater film 4. Optionally, the annular interference structure 102 in this embodiment is a groove structure, which is easy to process and has low cost.

[0052] Optionally, the cross-section of the annular interference structure 102 can be wedge-shaped, triangular, circular, polygonal, etc., and no specific limitation is made here.

[0053] Exemplarily, the cross-sectional shape of the annular interference structure 102 in this embodiment is an isosceles right triangle, and the groove depth is 1 mm. The groove depth is relatively deep and symmetric on both sides, so that the heat exchange tube can be used in both forward and reverse directions.

[0054] Optionally, along the axial direction of the tube body 10, the opening density of the annular interference structure 102 can be the same or different, and no specific limitation is made here.

[0055] Specifically, along the direction from the upper part to the lower part of the tube body 10, the distance between two adjacent annular interference structures 102 is increased, that is, the opening density of the annular interference structure 102 in the upper part of the tube body 10 is greater than that in the lower part of the tube body 10. Since seawater flows downward along the outer peripheral surface of the heat exchange tube, at the upper part of the heat exchange tube, the seawater flow velocity is relatively smaller than that at the lower part of the heat exchange tube. Therefore, the cross-sectional area is large, the seawater film 4 is relatively thick, and the boundary layer structure is more stable than that at the lower part of the heat exchange tube. Therefore, the heat exchange effect is worse. Therefore, increasing the density of the annular interference structure 102 in the upper part of the tube body 10 helps to increase the destruction effect on the stable seawater film 4 in the upper part of the tube body 10 and improve the heat exchange effect in the upper part of the tube body 10.

[0056] In some embodiments, the anti-icing layer is a superhydrophobic layer, that is, the water contact angle on the outer peripheral surface of the tube body 10 > 150° and the rolling angle < 10°, and it has good waterproof, anti-frosting and anti-adhesion properties.

[0057] Optionally, the anti-icing layer is formed by spraying, depositing or etching on the outer peripheral surface of the pipe body 10, and the formation of the anti-icing layer on the outer peripheral surface of the pipe body 10 can be achieved through the above surface treatment methods.

[0058] This embodiment also provides a gasification device, which includes the heat exchange tube described in any of the above solutions. By providing the above heat exchange tube, the service life of the heat exchange tube is increased, the maintenance frequency is reduced, and the gasification effect is improved.

[0059] This embodiment also provides a processing die, which is used for the formation of the heat exchange tube described in any of the above solutions.

[0060] Please refer to Figures 6 to 10 , specifically, the processing die includes an upper die 100, a middle die 200 and a lower die 300. The upper die 100 is provided with a plurality of flow channels 110 for supplying the material 1 to be formed to flow; a die core 120 is provided at the bottom of the upper die 100, and the shape of the die core 120 is the same as the shape of the through hole 101 of the heat exchange tube; the middle die 200 is fixedly connected to the bottom of the upper die 100, and the middle die 200 is provided with an extrusion cavity 210. The extrusion cavity 210 is sleeved on the outer periphery of the die core 120, and the shape of the extrusion cavity 210 is the same as the shape of the outer peripheral surface of the heat exchange tube. The material 1 to be formed flows between the inner wall of the extrusion cavity 210 and the outer peripheral wall of the die core 120; the lower die 300 is movably arranged at the bottom of the middle die 200, and the lower die 300 is provided with a forming cavity 301. The shape of the forming cavity 301 is the same as the shape of the outer peripheral surface of the heat exchange tube, and an annular protrusion 302 is provided on the inner wall of the forming cavity 301. The lower die 300 can be opened and closed to process the grooved annular interference structure 102.

[0061] In the processing die of this embodiment, when processing the heat exchange tube, the material 1 to be formed flows through the flow channels 110 to between the inner wall of the extrusion cavity 210 and the outer peripheral wall of the die core 120 for extrusion forming into a semi-finished heat exchange tube 2. The semi-finished heat exchange tube 2 continues to move. By the intermittent opening and closing of the lower die 300, the annular protrusion 302 can perform the forming process of the grooved annular interference structures 102 arranged at intervals on the outer peripheral surface of the semi-finished heat exchange tube 2, thereby realizing the processing and forming of the entire heat exchange tube and improving the processing efficiency of the heat exchange tube.

[0062] Optionally, the upper die 100 and the middle die 200 are fixed by bolts, and the fixing effect is better and the forming accuracy is higher.

[0063] Optionally, the lower mold 300 includes two half molds 310 which are capable of relative movement so that the lower mold 300 can be opened and closed. A molding cavity 301 is formed in the middle of the combined cores of the two half molds 310. The annular protrusion 302 on the inner wall of the molding cavity 301 can process the annular interference structure 102 on the outer periphery of the heat exchange tube.

[0064] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Heat exchange tube, characterized in that, It includes a tube body (10). A through hole (101) is formed in the tube body (10), and a component to be vaporized flows through the through hole (101). Seawater flows around the outer periphery of the tube body (10) to vaporize the component to be vaporized. Among them, a plurality of annular interference structures (102) are arranged at intervals along the axial direction of the outer peripheral surface of the tube body (10) to disturb the water flow. An anti-icing layer is further arranged on the outer peripheral surface of the tube body (10), and the anti-icing layer is used to reduce the adhesion of ice crystals (3).

2. The heat exchange tube according to claim 1, wherein The tube body (10) includes a base body (11) and outer fins (12), and a plurality of outer fins (12) are circumferentially distributed on the outer periphery of the base body (11).

3. The heat exchange tube according to claim 2, characterized in that, A plurality of inner fins (13) are circumferentially distributed on the inner wall of the through hole (101).

4. The heat exchange tube according to claim 3, characterized in that, The cross-sectional shape of the inner fin (13) is wavy.

5. The heat exchange tube according to claim 1, characterized in that, The annular interference structure (102) is a groove structure and / or a protrusion structure.

6. The heat exchange tube according to claim 1, wherein The anti-icing layer is a super-hydrophobic layer.

7. The heat exchange tube according to claim 1, wherein, The anti-icing layer is formed by spraying, depositing or etching on the outer peripheral surface of the tube body (10).

8. The heat exchange tube according to any one of claims 1-7, characterized in that, Along the direction from the upper part to the lower part of the tube body (10), the distance between two adjacent annular interference structures (102) is set to increase.

9. Gasification device, characterized in that, It includes a heat exchange tube according to any one of claims 1-8.

10. The processing die is characterized in that, For the forming of the heat exchange tube according to any one of claims 1-8, the processing die includes: An upper die (100) is provided with a plurality of flow channels (110) for supplying the material to be formed (1) to flow through. A die core (120) is arranged at the bottom of the upper die (100), and the shape of the die core (120) is the same as the shape of the through hole (101) of the heat exchange tube. A middle die (200) is fixedly connected to the bottom of the upper die (100). An extrusion cavity (210) is formed in the middle die (200), and the extrusion cavity (210) is sleeved on the outer periphery of the die core (120). The shape of the extrusion cavity (210) is the same as the shape of the outer peripheral surface of the heat exchange tube, and the material to be formed (1) flows between the inner wall of the extrusion cavity (210) and the outer peripheral wall of the die core (120). A lower die (300) is arranged at the bottom of the middle die (200) in a manner that can be opened and closed. A forming cavity (301) is formed in the lower die (300), and the shape of the forming cavity (301) is the same as the shape of the outer peripheral surface of the heat exchange tube. An annular protrusion (302) is formed on the inner wall of the forming cavity (301), and the lower die (300) can be opened and closed to process the groove-shaped annular interference structure (102).

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