Heat exchange panel for an open rack type vaporizer, and an open rack type vaporizer equipped with the heat exchange panel.
The heat exchange panel with varied fin configurations improves vaporization capacity and efficiency by reducing tube spacing and ice coverage in open rack type vaporizers.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- SUMITOMO PRECISION PRODUCTS CO LTD
- Filing Date
- 2022-07-13
- Publication Date
- 2026-07-29
AI Technical Summary
Existing heat transfer tube panels in open rack type vaporizers have wide spacing between tubes, limiting vaporization capacity and prone to ice formation which impairs heat transfer function.
A heat exchange panel with in-plane and out-of-plane fins of varying lengths and angles, allowing for closer tube spacing and reduced ice coverage, enhancing vaporization performance.
Increases vaporization capacity and maintains heat transfer efficiency by minimizing ice interference while optimizing fluid flow and heat transfer area.
Smart Images
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Abstract
Description
Technical Field
[0001] The technology disclosed herein relates to a heat exchange panel of an open rack type vaporizer and an open rack type vaporizer provided with the heat exchange panel.
Background Art
[0002] Patent Document 1 describes a heat transfer tube panel used in an open rack type vaporizer. This vaporizer is a device for vaporizing liquefied natural gas with seawater. The heat transfer tube panel has a plurality of heat transfer tubes. Seawater flows out from the trough toward the outer surface of the heat transfer tubes.
[0003] The heat transfer tubes described in Patent Document 1 have a plurality of fins arranged at equal intervals in the circumferential direction of the tube body. The plurality of fins include orthogonal fins protruding from the tube body in a direction orthogonal to the outflow direction of the seawater flowing out from the trough, and fins arranged in a region between the orthogonal fins and a virtual line extending from the tube body toward the trough along the outflow direction. In the heat transfer tubes described in Patent Document 1, the length in the radial direction of the fins arranged in the region is shorter than that of the orthogonal fins, and the length in the radial direction is longer as it is closer to the orthogonal fins. Thereby, in the vaporizer described in Patent Document 1, the opening length in the arrangement direction in the space between the fins adjacent to each other in the region is the same, and seawater can be uniformly supplied to each space.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] The aforementioned orthogonal fins extend in the direction in which the heat transfer tubes are aligned. The heat transfer tubes described in Patent Document 1 have long orthogonal fins. As a result, the heat transfer tube panels described in Patent Document 1 have wide spacing between the heat transfer tubes. The length of the panel (i.e., the length in the direction in which the heat transfer tubes are aligned) is limited, for example, by the installation location of the vaporizer. If the spacing between the heat transfer tubes is wide, the number of heat transfer tubes included in a single panel decreases. As a result, the vaporization capacity of a single panel decreases.
[0006] Furthermore, in a vaporizer, the lower part of the heat transfer tube is in contact with low-temperature liquefied natural gas. Ice tends to form on the outer surface of the lower part of the heat transfer tube. In the heat transfer tube described in Patent Document 1, the radial length of the fins arranged in the aforementioned region is short. Therefore, if the outer surface of the heat transfer tube is covered with ice, the short fins may become buried in the ice. As a result, the heat transfer function of the fins cannot be performed, and the vaporization performance of the heat exchange panel deteriorates.
[0007] The technology disclosed herein enhances the vaporization performance of heat exchange panels in open rack type vaporizers. [Means for solving the problem]
[0008] The technology disclosed herein relates to a heat exchange panel for an open rack type vaporizer. The heat exchange panel vaporizes the target fluid by allowing a heat transfer medium to flow down its outer surface. Each of the heat exchange panels comprises a plurality of heat transfer tubes through which the target fluid flows and which are aligned in the in-plane direction, The heat transfer medium is supplied to the heat exchange panel from an out-of-plane direction perpendicular to the in-plane direction. The heat transfer tube has a main body and a plurality of fins that protrude outward from the outer surface of the main body. The plurality of fins include in-plane fins that protrude in the in-plane direction and out-of-plane fins that protrude in a direction different from the in-plane direction, and the in-plane fins of adjacent heat transfer tubes are in contact with each other. The protruding length of the in-plane fin is less than or equal to the protruding length of the out-of-plane fin, and is the shortest among the plurality of fins.
[0009] According to the above configuration, the in-plane fins protruding in the heat exchange tubes constituting the heat exchange panel have a short protrusion length. Although the in-plane fins of adjacent heat exchange tubes come into contact with each other, the short protrusion length of the in-plane fins reduces the spacing between adjacent heat exchange tubes. This allows for a larger number of heat exchange tubes to be included in a single heat exchange panel without increasing the length of the panel itself. This also allows for a higher vaporization capacity of a single heat exchange panel.
[0010] Furthermore, the out-of-plane fins, which protrude in a direction different from the in-plane direction, have a relatively long protrusion length. Even if ice forms on the outer surface of the heat transfer tube, the out-of-plane fins with their long protrusion length are less likely to be buried in the ice. This suppresses a decrease in the heat transfer function of the out-of-plane fins.
[0011] Therefore, this configuration of heat exchange panel improves vaporization performance.
[0012] The plurality of fins are provided at equal intervals in the circumferential direction on the outer surface of the main body. In the cross-section of the heat transfer tube, the out-of-plane fins are inclined away from the in-plane fins with respect to the radial direction from the center of the main body. The inclination angle of the out-of-plane fins with respect to the radial direction may be larger for out-of-plane fins that are closer to the in-plane fins.
[0013] Out-of-plane fins located near in-plane fins face off against out-of-plane fins on adjacent heat transfer tubes. As mentioned above, when the protrusion length of in-plane fins is short and the distance between adjacent heat transfer tubes is narrow, the distance between opposing out-of-plane fins on adjacent heat transfer tubes is also narrow. When the distance between out-of-plane fins is narrow, the amount of heat transfer fluid that passes between those out-of-plane fins and reaches the body of the heat transfer tube is reduced. This is detrimental to improving the vaporization performance of the heat exchange panel.
[0014] By tilting out-of-plane fins that are close to in-plane fins away from the in-plane fins, the spacing between opposing out-of-plane fins in adjacent heat transfer tubes increases. This suppresses the reduction in the amount of heat transfer fluid that passes between the out-of-plane fins and reaches the main body of the heat transfer tube. As a result, the vaporization performance of the heat exchange panel improves.
[0015] Furthermore, the inclination angle of the out-of-plane fins with respect to the radial direction is increased for out-of-plane fins closer to the in-plane fins, or in other words, the inclination angle is decreased for out-of-plane fins further away from the in-plane fins. By changing the inclination angle according to the position of the out-of-plane fins, the spacing between adjacent out-of-plane fins can be made uniform or nearly uniform throughout the heat exchange panel. This makes it possible to make the amount of heat transfer medium that passes between the out-of-plane fins and reaches the main body of the heat transfer tubes uniform or nearly uniform, thereby improving the vaporization performance of the heat exchange panel.
[0016] The protruding length of the out-of-plane fin may be longer for out-of-plane fins that are further away from the in-plane fins.
[0017] In this configuration, the protrusion length of out-of-plane fins near the in-plane fins is short. This prevents the spacing between opposing out-of-plane fins in adjacent heat transfer tubes from becoming too narrow. This reduces the amount of heat transfer fluid that passes between the out-of-plane fins and reaches the body of the heat transfer tube. This improves the vaporization performance of the heat exchange panel.
[0018] Furthermore, out-of-plane fins located away from in-plane fins have a long protrusion length. In other words, out-of-plane fins that protrude out of plane, or nearly out of plane, have a long protrusion length. Out-of-plane fins that protrude out of plane, or nearly out of plane, do not interfere with other out-of-plane fins, even if their protrusion length is long. By increasing the protrusion length of out-of-plane fins, the heat transfer area is expanded. Also, even if the outer surface of the heat transfer tube is covered with ice, out-of-plane fins with long protrusion lengths will not be buried in the ice. The heat transfer function of the out-of-plane fins is utilized, and even if ice forms on the outer surface of the heat transfer tube, the vaporization performance of the heat exchange panel is maintained at a high level.
[0019] The technology disclosed herein relates to an open rack type vaporizer. This open rack type vaporizer includes the heat exchange panel described above, and a first header pipe attached to one end of the heat transfer pipe constituting the heat exchange panel and supplying the target fluid to the heat transfer pipe, and a second header pipe attached to the other end of the heat transfer pipe and through which the vaporized fluid flows, and a trough disposed above the heat exchange panel and supplying the heat medium to the outer surface of the heat exchange panel.
[0020] As described above, since the heat exchange panel improves the vaporization performance, the open rack type vaporizer provided with the heat exchange panel also has improved performance.
Effect of the Invention
[0021] As described above, the heat exchange panel of this open rack type vaporizer and the open rack type vaporizer provided with the heat exchange panel can improve the vaporization performance.
Brief Description of the Drawings
[0022] [Figure 1] FIG. 1 is a diagram showing a configuration example of an open rack type vaporizer. [Figure 2] FIG. 2 is a cross-sectional view of the heat exchange panel (a part of the cross-section II-II in FIG. 1). [Figure 3] FIG. 3 is a corresponding diagram to FIG. 2 showing a modified example of the heat exchange panel.
Modes for Carrying Out the Invention
[0023] Hereinafter, the open rack type vaporizer disclosed herein and the heat exchange panel used therein will be described in detail with reference to the drawings. Note that the following description is illustrative.
[0024] (Configuration of Open Rack Type Vaporizer) Figure 1 shows the overall configuration of an Open Rack Vaporizer (ORV) 1. This ORV 1 is a device that heats and vaporizes liquefied natural gas (LNG), which is a low-temperature liquid, using seawater as a heat transfer medium. Figure 1 shows the heat exchange panel 3 and its associated equipment, which constitute the main part of the ORV 1. The ORV 1 is equipped with a heat exchange panel 3, which is made up of multiple heat transfer tubes 2 that extend vertically and are arranged horizontally in parallel to form a panel. Although not shown in the illustration, the ORV 1 is configured by arranging multiple heat exchange panels 3 in parallel according to the specifications.
[0025] An upper header pipe 4 extending horizontally is installed above the heat exchange panel 3. A lower header pipe 5 extending horizontally is installed below the heat exchange panel 3, parallel to the upper header pipe 4. Each heat transfer tube 2 has its upper end connected to the upper header pipe 4 and its lower end connected to the lower header pipe 5. The heat transfer tubes 2 connect the upper header pipe 4 and the lower header pipe 5 to each other.
[0026] The upper header pipe 4 is connected to the upper manifold 6. The lower header pipe 5 is connected to the lower manifold 7.
[0027] A trough 8 extending horizontally is positioned above the heat exchange panel 3, adjacent to the heat transfer tubes 2. When seawater is supplied to the trough 8, the seawater overflowing from the trough 8 flows down along the outer surface of the heat exchange panel 3 (i.e., the heat transfer tubes 2).
[0028] LNG is supplied to the lower header pipe 5 via the lower manifold 7 and flows into the heat transfer tubes 2. The LNG that flows into the heat transfer tubes 2 vaporizes by exchanging heat with seawater flowing down along the surface of the heat exchange panel 3, becoming NG, which flows out from the upper end of the heat transfer tubes 2 into the upper header pipe 4. The NG that flows out into the upper header pipe 4 is sent to the outside through the upper manifold 6. Alternatively, the ORV1 may be configured such that LNG flows into the upper manifold 6, vaporizes as it flows down the heat transfer tubes 2, and then the NG flows out from the lower manifold 7.
[0029] (Configuration of the heat exchange panel) Figure 2 shows a cross-sectional view of the heat exchange panel 3. Note that hatching that should be applied to the cross-section is omitted in Figure 2. As mentioned above, the heat exchange panel 3 is composed of multiple heat transfer tubes 2 arranged in the in-plane direction. The in-plane direction is the direction in which the heat transfer tube panel 3 expands and is perpendicular to the out-of-plane direction in which seawater is supplied from the trough 8. The in-plane direction is the left-right direction on the paper in Figure 2, and the out-of-plane direction is the up-down direction on the paper in Figure 2.
[0030] The heat transfer tube 2 is composed of a cylindrical body 21 and a plurality of fins 22 that extend radially outward from the outer surface of the body 21. Each fin 22 protrudes radially outward from the outer surface of the body 21. Although detailed illustration is omitted, each fin 22 extends in the direction of the tube axis of the heat transfer tube 2, that is, in the direction perpendicular to the plane of the paper in Figure 2.
[0031] In the configuration example shown in Figure 2, the heat transfer tube 2 has 10 fins 22. The 10 fins 22 are arranged at equal intervals in the circumferential direction on the outer surface of the main body 21. The heat transfer tube 2 is configured symmetrically with respect to a plane extending out of the plane, and also symmetrically with respect to a plane extending in the in-plane direction.
[0032] The 10 fins 22 include in-plane fins that protrude in the in-plane direction and out-of-plane fins that protrude in a direction different from the in-plane direction. In Figure 2, the in-plane fin that protrudes from the main body 21 toward the right of the paper is designated as the first fin F1, and the fins 22 are designated as the second fin F2, third fin F3, fourth fin F4, fifth fin F5, sixth fin F6, seventh fin F7, eighth fin F8, ninth fin F9, and tenth fin F10 in a counterclockwise direction from the first fin F1. The first fin F1 and the sixth fin F6 are in-plane fins that protrude in the in-plane direction, while the second fins F2 to the fifth fins F5 and the seventh fins F7 to the tenth fins F10 are out-of-plane fins. The in-plane fins, the first fin F1 and the sixth fin F6, are in contact with the sixth fin F6 and the first fin F1 of the heat transfer tube 2 adjacent to each other in the in-plane direction.
[0033] Furthermore, this heat transfer tube 2 does not have fins that protrude out of the plane from the main body 21.
[0034] Next, we will explain the length and angle of each fin. As mentioned above, the heat transfer tube 2 is symmetrical with respect to both the plane extending out of plane and the plane extending in plane. Therefore, we will explain the first fin F1, the second fin F2, and the third fin F3. The explanation for the first fin F1, the second fin F2, and the third fin F3 is the same for the sixth fin F6, the fifth fin F5, and the fourth fin F4, as well as the sixth fin F6, the seventh fin F7, and the eighth fin F8, and the first fin F1, the ninth fin F9, and the tenth fin F10.
[0035] First, the length of each fin will be described. This length means the protruding length from the outer peripheral surface of the main body 21 of the heat transfer tube 2 (shown by the dashed line in FIG. 2) to the tip of the fin. When comparing the length L1 of the first fin F1, the length L2 of the second fin F2, and the length L3 of the third fin F3, in the example of FIG. 2, the length L1 of the first fin F1 is the shortest, the length L3 of the third fin F3 is the longest, and the length L2 of the second fin F2 is intermediate, being greater than or equal to L1 and less than or equal to L3. The lengths L1 of the first fin F1, L2 of the second fin F2, and L3 of the third fin F3 only need to satisfy the relationship L1 ≤ L2 ≤ L3 (where L1 < L3). In other words, the protruding length of the in-plane fin is less than or equal to the protruding length of the out-of-plane fin and is the shortest among the plurality of fins. In the example of FIG. 2, as the distance from the first fin F1 increases, the length of the fin becomes longer.
[0036] Since the protruding length of the first fin F1, which is an in-plane fin, is short, the distance between adjacent heat transfer tubes 2 is relatively narrow. The length of the heat exchange panel 3 in the ORV1, that is, the length in the in-plane direction in which the heat transfer tubes 2 are arranged, is restricted by, for example, the installation location of the ORV1. When the distance between the heat transfer tubes 2 is narrow, even if the length of the heat exchange panel 3 is not increased, the number of heat transfer tubes 2 included in a single heat exchange panel 3 can be increased. This heat exchange panel 3 can enhance the vaporization capacity per sheet.
[0037] The out-of-plane fins have a long protruding length. In the ORV1, since the lower part of the heat transfer tube 2 to which LNG is supplied has a low temperature of LNG, ice is likely to adhere to the outer surface. Therefore, the outer surface of the heat exchange panel 3 may be covered with ice. As virtually shown in FIG. 2, even if the outer surface of the heat exchange panel 3 is covered with ice 100, since the protruding lengths of the second fin F2 and the third fin F3, which are out-of-plane fins, are long, it is suppressed that the second fin F2 and the third fin F3 are buried in the ice 100. As a result, the heat transfer function by the out-of-plane fins is exerted, and it is suppressed that the vaporization performance of the heat exchange panel 3 deteriorates.
[0038] Next, let's explain the angles of each fin. As mentioned earlier, the first fin F1 protrudes in the in-plane direction. The second fin F2 is inclined at an angle θ2 away from the first fin F1 with respect to the radial direction from the center of the heat transfer tube 2, as shown by the dashed line in Figure 2. The third fin F3 is also inclined at an angle θ3 away from the first fin F1 with respect to the radial direction from the center of the heat transfer tube 2. Angle θ3 is smaller than angle θ2.
[0039] The second fin F2 is closer to the first fin F1 than to the third fin F3. The second fin F2 faces the fifth fin F5 of the adjacent heat transfer tube 2. As mentioned above, if the protruding length of the in-plane fin is short and the distance between adjacent heat transfer tubes 2 is narrow, the distance between the second fin F2 and the fifth fin F5 will also be narrow. If the distance between the second fin F2 and the fifth fin F5 is narrow, the amount of seawater that passes between the second fin F2 and the fifth fin F5 and reaches the main body 21 will decrease. This is detrimental to improving the vaporization performance of the heat exchange panel 3.
[0040] Therefore, as mentioned above, by tilting the second fin F2 (and the fifth fin F5) away from the first fin F1 (and the sixth fin F6), the distance P1 between the tips of the second fin F2 and the fifth fin F5 is increased. Also, as mentioned above, the length L2 of the second fin F2 (and the length of the fifth fin F5) is shorter than the length L3 of the third fin F3 (and the length of the fourth fin F4). This also increases the distance P1 between the tips of the second fin F2 and the fifth fin F5. By increasing the distance P1 between the tips of the second fin F2 and the fifth fin F5, a sufficient amount of seawater can pass through this area and reach the main body 21.
[0041] Furthermore, by relatively reducing the inclination angle θ3 of the third fin F3, which is farther from the first fin F1, the distance P2 between the tips of the third fin F3 and the second fin F2, and the distance P3 between the tips of the third fin F3 and the adjacent fourth fin F4, become relatively larger. As a result, the distances P1, P2, and P3 between the tips of the fins become uniform or nearly uniform throughout the heat exchange panel 3. This makes the amount of seawater passing between the fins and reaching the main body 21 uniform or nearly uniform, improving the vaporization performance of the heat exchange panel 3.
[0042] As mentioned above, this heat transfer tube 2 does not have fins that protrude out of plane; in other words, there are no fins between the third fin F3 and the fourth fin F4. As a result, the distance P3 between the tips of the third fin F3 and the fourth fin F4 becomes relatively large, making it possible to supply seawater evenly or nearly evenly to the entire heat exchange panel 3.
[0043] The third fin F3 and the fourth fin F4 each protrude from the body 21 of the heat transfer tube 2 in a direction close to the out-of-plane direction, and the third fin F3 and the fourth fin F4 are approximately parallel to each other. Therefore, even if the length L3 of the third fin F3 and the fourth fin F4 is increased, they do not interfere with the other fins, and the distance between the tips of the fins does not become narrower. By making the length L3 of the third fin F3 (and the fourth fin F4) the longest, the heat transfer area is increased. In addition, even if ice 100 forms on the heat transfer tube 2, the third fin F3 (and the fourth fin F4) will not be buried in the ice 100. The decrease in the vaporization performance of the heat exchange panel 3 is suppressed.
[0044] (Modified heat exchange panel) Figure 3 shows a modified example of the heat exchange panel. The heat exchange panel 3 in Figure 3 has a different configuration of the heat transfer tubes 20 from that of the heat exchange panel 3 in Figure 2. The heat transfer tube 20 has 12 fins 22. The 12 fins 22 are provided at equal intervals in the circumferential direction on the outer peripheral surface of the main body 21. The heat transfer tube 20 is configured to be plane-symmetric with respect to a plane extending in the out-of-plane direction and also plane-symmetric with respect to a plane extending in the in-plane direction.
[0045] In Figure 3, the in-plane fin protruding from the main body 21 in the right direction of the paper surface is defined as the first fin F1. When each fin 22 is defined as the second fin F2, the third fin F3, the fourth fin F4, the fifth fin F5, the sixth fin F6, the seventh fin F7, the eighth fin F8, the ninth fin F9, the tenth fin F10, the eleventh fin F11, and the twelfth fin F12 in the counterclockwise direction from the first fin F1, the first fin F1 and the seventh fin F7 are in-plane fins protruding in the in-plane direction, and the second fin F2 to the sixth fin F6 and the eighth fin F8 to the twelfth fin F12 are out-of-plane fins, respectively. The fourth fin F4 and the tenth fin F10 are fins protruding in the out-of-plane direction, respectively.
[0046] Next, the lengths of each fin will be described. When comparing the length L1 of the first fin F1, the length L2 of the second fin F2, and the length L3 of the third fin F3, in the example of Figure 3, the length L1 of the first fin F1 is the shortest, the length L3 of the third fin F3 is the longest, and the length L2 of the second fin F2 is intermediate between L1 and L3. The lengths L1 of the first fin F1, L2 of the second fin F2, and L3 of the third fin F3 only need to satisfy the relationship of L1 ≤ L2 ≤ L3 (where L1 < L3). In the example of Figure 3, the length of the fin increases as it moves away from the first fin F1. Incidentally, the length L4 of the fourth fin F4 may be the same as or longer than the length L3 of the third fin F3.
[0047] By shortening the length L1 of the first fin F1, which is an in-plane fin, the spacing between adjacent heat transfer tubes 20 in this heat exchange panel 3 can be reduced, thus increasing the number of heat transfer tubes 20 included in a single heat exchange panel 3. This allows for an increase in the vaporization capacity per panel of this heat exchange panel 3.
[0048] Furthermore, because the protruding lengths L2, L3, and L4 of the out-of-plane fins, the second fin F2, the third fin F3, and the fourth fin F4, are long, it is suppressed that these fins become buried in the ice. As a result, the heat transfer function of the out-of-plane fins is utilized, and a decrease in the vaporization performance of the heat exchange panel 3 is suppressed.
[0049] Next, we will explain the angles θ2 and θ3 of each fin. The inclination angle of the out-of-plane fins decreases as they move away from the first fin F1. Specifically, the inclination angle θ2 of the second fin F2 is greater than the inclination angle θ3 of the third fin F3.
[0050] By making the inclination angle θ2 of the second fin F2 relatively large, the distance P1 between the tips of the second fin F2 and the sixth fin F6 of the adjacent heat transfer tube 20 can be widened. Also, because the length L2 of the second fin F2 is relatively short, this also widens the distance P1 between the tips of the second fin F2 and the sixth fin F6. A sufficient amount of seawater can be secured to pass between the second fin F2 and the sixth fin F6 of the adjacent heat transfer tube 20 and reach the main body 21.
[0051] Furthermore, by relatively reducing the inclination angle θ3 of the third fin F3, the distance P2 between the third fin F3 and the second fin F2, and the distance P3 between the third fin F3 and the fourth fin F4, become relatively larger. As a result, the distances P1, P2, and P3 between the tips of the fins become uniform or nearly uniform throughout the heat exchange panel 3. This makes the amount of heat transfer medium passing between the fins uniform or nearly uniform, improving the vaporization performance of the heat exchange panel 3.
[0052] Furthermore, by increasing the lengths L3 and L4 of the third fin F3 and the fourth fin F4, the heat transfer area can be increased without the fins interfering with each other or narrowing the gap between the tips of the fins. In addition, even if ice forms on the heat transfer tube 20, the third fin F3 and the fourth fin F4 will not be buried in the ice. The decrease in the vaporization performance of the heat exchange panel 3 is suppressed.
[0053] Note that the configuration examples for heat transfer tubes 2 and 20 are not limited to those listed here. The number of fins on the heat transfer tubes can be set to an appropriate number. [Explanation of Symbols]
[0054] 1. Open rack type vaporizer 2 Heat transfer tubes 20 heat transfer tubes 21 Main unit 22 fins 4. Upper header pipe (second header pipe) 5. Lower header pipe (first header pipe) 8 Trough F1 1st fin (in-plane fin) F2 Second fin (outside fin) F3 3rd fin (outside fin) F4 4th fin (outside fin) F5 5th fin (outside fin) F6 6th fin (in-plane fin, out-plane fin) F7 7th fin (in-plane fin, out-plane fin) F8 8th fin (outside fin) F9 9th fin (outside fin) F10 10th fin (outside fin) F11 11th fin (outside-plane fin) F12 12th fin (outside fin)
Claims
1. A heat exchange panel for an open rack type vaporizer, in which a heat transfer medium flows down the outer surface to vaporize the target fluid, Each of the heat exchange panels comprises a plurality of heat transfer tubes through which the target fluid flows and which are aligned in the in-plane direction, The heat transfer medium is supplied to the heat exchange panel from an out-of-plane direction perpendicular to the in-plane direction. The heat transfer tube has a main body and a plurality of fins that protrude outward from the outer surface of the main body. The plurality of fins include in-plane fins that protrude in the in-plane direction and out-of-plane fins that protrude in a direction different from the in-plane direction, and the in-plane fins of adjacent heat transfer tubes are in contact with each other. The protruding length of the in-plane fin is less than or equal to the protruding length of the out-of-plane fin, and is the shortest among the plurality of fins. The base ends of the plurality of fins are provided at equal intervals in the circumferential direction on the outer surface of the main body. In the cross-section of the heat transfer tube, the out-of-plane fins are inclined away from the in-plane fins with respect to the radial direction from the center of the main body. The inclination angle of the out-of-plane fins with respect to the radial direction is larger for out-of-plane fins that are closer to the in-plane fins in the heat exchange panel of an open rack type vaporizer.
2. In the heat exchange panel of the open rack type vaporizer described in claim 1, The out-of-plane fins have a protruding length that is longer for out-of-plane fins that are farther from the in-plane fins, and this is the case for the heat exchange panel of an open rack type vaporizer.
3. A heat exchange panel according to claim 1 or 2, A first header pipe is attached to one end of the heat transfer tubes constituting the heat exchange panel and supplies the target fluid to the heat transfer tubes, A second header pipe is attached to the other end of the heat transfer tube and through which the vaporized fluid flows, An open rack type vaporizer comprising a trough disposed above the heat exchange panel and supplying the heat transfer medium to the outer surface of the heat exchange panel.