Wound tube type heat exchanger

Abstract

The utility model discloses a coiled tube type heat exchanger which comprises a shell, two shell pass tube openings are formed in the side wall of the shell, a shell pass sealing head is arranged at each of the two ends of the shell, inner tube plates are arranged at the center of the outer end, away from the shell, of each shell pass sealing head, a plurality of tube bundles are arranged between the two inner tube plates, and outer tube plates are arranged on the opposite sides of the two inner tube plates. A tube pass end socket is arranged on the side, back on to the inner tube plate, of the outer tube plate, and a tube pass tube opening is formed in the tube pass end socket. An outer tube plate tube hole is formed in the outer tube plate, and the end part of the tube bundle is fixedly connected with the outer tube plate tube hole; and a gap is reserved between the inner tube plate and the outer tube plate on the same side of the shell. The inner tube plate and the outer tube plate on the same side of the shell form a double-tube-plate structure connected with the tube bundle, the risk of medium leakage is greatly reduced, a material leakage observation area is formed in a gap between the inner tube plate and the outer tube plate, and once leakage is observed, operation of equipment is stopped, and then cross contamination of tube pass media and shell pass media is prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat exchanger technical field, concretely relates to a coiled tube heat exchanger. BACKGROUND

[0002] The coiled tube heat exchanger has incomparable advantages relative to the common column tube heat exchanger, and is suitable for the heat exchange occasions between multiple fluids in the fields of petroleum, natural gas and chemical industry, has wide temperature range, can adapt to thermal shock, can eliminate thermal stress itself and has high compactness. The structure of the coiled tube heat exchanger usually comprises a shell, two shell side tube openings are arranged on the side wall of the shell, shell side end covers are arranged at the axial two ends of the shell, tube sheets are arranged at the centers of the shell side end covers, a plurality of tube bundles spirally wound around a core cylinder are arranged between the upper and lower tube sheets, the core cylinder is fixed between the two tube sheets, through holes communicating with the tube bundles are arranged on the tube sheets, tube side end covers are respectively connected to the opposite end faces of the two tube sheets, and tube side tube openings are arranged on the two tube side end covers. When the connection between the tube bundle and the tube sheet is not tight, there is a risk of mutual leakage and penetration of the tube side medium and the shell side medium. However, the existing structure in which a single tube sheet is arranged at the tube side end portion cannot observe the leakage of the medium, because the two sides of the tube sheet are respectively the shell side region and the tube side end cover. SUMMARY

[0003] To solve the problem that the leakage of the medium in the existing coiled tube heat exchanger cannot be observed, the utility model provides a coiled tube heat exchanger.

[0004] A coiled tube heat exchanger comprises a shell, two shell side tube openings are arranged on the side wall of the shell, shell side end covers are arranged at the two ends of the shell, inner tube sheets are arranged at the centers of the outer ends of the shell side end covers away from the shell, a plurality of tube bundles spirally wound around a core cylinder are fixedly arranged between the two inner tube sheets, the core cylinder is fixed between the two inner tube sheets, and inner tube sheet holes are arranged on the inner tube sheets.

[0005] An outer tube sheet is arranged on each side of the two inner tube sheets away from each other, a tube side end cover is fixedly arranged on the side of the outer tube sheet away from the inner tube sheet, and a tube side tube opening is arranged on the tube side end cover.

[0006] An outer tube sheet hole is arranged on the outer tube sheet, and the end portion of the tube bundle is fixedly connected to the corresponding outer tube sheet hole.

[0007] A gap is left between the inner tube sheet and the outer tube sheet on the same side of the shell.

[0008] Preferably, the inner diameter of the shell is greater than the inner diameter of the opening of the tube side end cover facing the outer tube sheet.

[0009] Preferably, a center connecting block is arranged at the center of the gap, and the center connecting block is fixedly connected to the corresponding inner tube sheet and outer tube sheet.

[0010] Preferably, the radially outer end of the void is uniformly provided with a plurality of external connecting blocks in the circumferential direction, and the external connecting blocks are fixedly connected with the radially outer side wall of the corresponding inner tube plate and outer tube plate.

[0011] Preferably, the radially outer side of the void is formed into a closed structure through an annular sealing plate, and the annular sealing plate is provided with a leak detection hole penetrating into the void.

[0012] Preferably, the annular sealing plate is fixedly connected with the axial end face of the corresponding inner tube plate and outer tube plate.

[0013] Preferably, the annular sealing plate is fixedly connected with the radially outer side of the corresponding inner tube plate and outer tube plate.

[0014] Preferably, the outer annular flange coaxially arranged on the end face of the outer tube plate facing the inner tube plate serves as the annular sealing plate, and the outer annular flange is fixedly connected with the axial end face of the adjacent inner tube plate.

[0015] Preferably, the inner annular flange coaxially arranged on the end face of the inner tube plate facing the outer tube plate serves as the annular sealing plate, and the inner annular flange is fixedly connected with the axial end face of the adjacent outer tube plate.

[0016] The utility model discloses a beneficial effect is:

[0017] (1) in the utility model discloses a coiled tube heat exchanger, and the inner tube plate and the outer tube plate of the same side of the shell form the double tube plate structure connected with the tube bundle, and the double tube plate structure is compared to the single tube plate structure of prior art, on one hand, the risk of medium leakage is greatly reduced, and on the other hand, the material leakage observation area is formed at the void between the inner tube plate and the outer tube plate, and once the leakage is observed, the operation of the equipment is stopped, and then the cross contamination of the tube medium and the shell medium is prevented.

[0018] (2) the setting of the annular sealing plate of the utility model, through the leak detection hole, whether the heat exchanger has leakage can be observed, and the medium pressure difference balance can be filled into the closed void. DRAWINGS

[0019] The drawings accompanying the specification of this application form a part hereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application and explanations thereof, make an explanation of the application, and do not constitute improper limitations on the application.

[0020] Figure 1 It is the structure schematic diagram of the utility model discloses a coiled tube heat exchanger;

[0021] Figure 2 It is the structure schematic diagram of the void in the utility model embodiment 1;

[0022] Figure 3 It is the structure schematic diagram of the void in the utility model embodiment 2;

[0023] Figure 4 is the structural schematic diagram of the interspace in the embodiment 3 of the utility model;

[0024] Figure 5 is the structural schematic diagram of the interspace in the embodiment 5 of the utility model;

[0025] Figure 6 is the structural schematic diagram of the interspace in the embodiment 6 of the utility model;

[0026] Figure 7 is the structural schematic diagram of the interspace in the embodiment 7 of the utility model;

[0027] Figure 8 is the structural schematic diagram of the interspace in the embodiment 8 of the utility model;

[0028] Wherein:

[0029] 1-shell, 101-shell tube mouth, 2-shell head, 3-inner tube plate, 301-outer annular flange, 4-tube bundle, 5-outer tube plate, 501-outer annular flange, 6-tube head, 601-tube mouth, 7-interspace, 701-center connecting block, 702-external connecting block, 8-annular sealing plate. DETAILED DESCRIPTION

[0030] In order to make the technical personnel of the prior art better understand the technical scheme of the utility model, the utility model is further explained in detail below in combination with the drawings and specific embodiments.

[0031] Embodiment 1:

[0032] As shown in Figure 1 A spiral wound heat exchanger, comprising a shell 1, two shell tube mouths 11 are arranged on the side wall of the shell 1, one shell head 2 is arranged at each end of the shell 1, an inner tube plate 3 is arranged at the center of the outer end of the shell head 2 away from the shell 1, a plurality of spiral wound tube bundles 4 are fixedly arranged between the two inner tube plates 3, the core barrel is fixed between the two inner tube plates 3, inner tube plate tube holes are arranged on the inner tube plate 3, and the tube bundle 4 passes through the corresponding inner tube plate tube hole and is expanded with the inner tube plate tube hole;

[0033] One outer tube plate 5 is arranged on the side of each of the two inner tube plates 3, a tube head 6 is fixedly arranged on the side of the outer tube plate 5 away from the inner tube plate 3, and a tube mouth 601 is arranged on the tube head 6;

[0034] Through holes are arranged on the outer tube plate 5, and the end of the tube bundle 4 is fixedly connected with the corresponding outer tube plate tube hole;

[0035] As shown in Figure 2 The interspace 7 is left between the inner tube plate 3 and the outer tube plate 5 on the same side of the shell 1.

[0036] Preferably, the inner diameter of the shell 1 is larger than the opening inner diameter of the tube side head 6 facing the outer tube plate 5, so that the heat exchanger forms a contracted structure, reducing the size of the tube plate and lowering the production cost.

[0037] In the tube around heat exchanger in embodiment 1, the inner tube plate 3 and the outer tube plate 5 on the same side of the shell 1 form a double tube plate structure connected with the tube bundle 4. Compared with the existing single tube plate structure, on the one hand, the risk of medium leakage is greatly reduced, and on the other hand, a material leakage observation area is formed at the gap 7 between the inner tube plate 3 and the outer tube plate 5. Once leakage is observed, the operation of the equipment is stopped, thereby preventing cross contamination of the tube side medium and the shell side medium.

[0038] Embodiment 2:

[0039] On the basis of embodiment 1, as shown in the figure, a center connecting block 701 is arranged at the center of the gap 7, and the center connecting block 701 is fixedly connected with the corresponding inner tube plate 3 and outer tube plate 5, thereby playing a fixing role. Figure 3

[0040] Embodiment 3:

[0041] On the basis of embodiment 1, as shown in the figure, a plurality of outer connecting blocks 702 are uniformly arranged along the circumferential direction at the radial outer end of the gap 7, and the outer connecting blocks 702 are fixedly connected with the radial outer side walls of the corresponding inner tube plate 3 and outer tube plate 5, thereby playing a fixing role. The outer connecting blocks 702 can be removed after the heat exchanger is processed, or can be partially retained. Figure 4

[0042] Embodiment 4:

[0043] On the basis of embodiment 1, the radial outer side of the gap 7 forms a closed structure through the annular sealing plate 8, and the annular sealing plate 8 is provided with a leak detection hole penetrating into the gap 7.

[0044] In embodiment 4, through the leak detection hole, it is convenient to observe whether the heat exchanger has leakage, and the medium balance pressure difference can also be filled into the closed gap 7. The structure of embodiment 4 can reduce the leakage of the medium, and is suitable for the working condition that a small amount of leakage will cause great harm.

[0045] Embodiment 5:

[0046] On the basis of embodiment 4, as shown in the figure, the annular sealing plate 8 is fixedly connected with the axial end faces of the corresponding inner tube plate 3 and outer tube plate 5. Specifically, the annular sealing plate 8 and the axial end faces of the corresponding inner tube plate 3 and outer tube plate 5 are welded and connected. Figure 5

[0047] Embodiment 6: ​​​

[0048] On the basis of embodiment 4, as shown in Figure 6 The annular sealing plate 8 is fixedly connected with the radially outer side of the corresponding inner tube plate 3 and outer tube plate 5, and specifically, the annular sealing plate 8 is welded with the radially outer side of the corresponding inner tube plate 3 and outer tube plate 5.

[0049] Embodiment 7:

[0050] On the basis of embodiment 4, as shown in Figure 7 The outer annular flange 501 as the annular sealing plate 8 is coaxially arranged on the end face of the outer tube plate 5 facing the inner tube plate 3, and the outer annular flange 501 is fixedly connected with the axial end face of the adjacent inner tube plate 3.

[0051] The outer annular flange 501 is welded with the axial end face of the adjacent inner tube plate 3.

[0052] In embodiment 7, the outer annular flange 501 is integrally arranged on the outer tube plate 5 as the annular sealing plate 8, thereby reducing the welding amount, reducing the late influence of welding on the expansion joint between the tube bundle 4 and the tube plate, and increasing the strength and operability.

[0053] Embodiment 8:

[0054] On the basis of embodiment 4, as shown in Figure 8 The inner annular flange 301 as the annular sealing plate 8 is coaxially arranged on the end face of the inner tube plate 3 facing the outer tube plate 5, and the inner annular flange 301 is fixedly connected with the axial end face of the adjacent outer tube plate 5.

[0055] The inner annular flange 301 is welded with the axial end face of the adjacent outer tube plate 5.

[0056] In embodiment 8, the inner annular flange 301 is integrally arranged on the inner tube plate 3 as the annular sealing plate 8, thereby reducing the welding amount, reducing the late influence of welding on the expansion joint between the tube bundle 4 and the tube plate, and increasing the strength and operability.

[0057] Although the specific embodiments of the utility model have been described in combination with the drawings, it is not a limitation of the utility model, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.

Claims

1. A spiral wound heat exchanger characterized by: The application relates to a shell (1) provided with two shell-side pipe orifices (101) on the side wall, one shell-side end cover (2) arranged at the outer end of the shell (1), an inner tube plate (3) arranged at the center of the outer end of the shell (1) away from the shell-side end cover (2), a plurality of tube bundles (4) spirally wound around a core cylinder fixed between the two inner tube plates (3), the core cylinder being fixed between the two inner tube plates (3), and inner tube plate tube holes being arranged on the inner tube plate (3). One outer tube plate (5) is arranged on the side of the two inner tube plates (3) away from each other, a tube-side end cover (6) is fixed on the side of the outer tube plate (5) away from the inner tube plate (3), and a tube-side pipe orifice (601) is arranged on the tube-side end cover (6). Through-holes are arranged on the outer tube plate (5), and the end of the tube bundle (4) is fixedly connected with the corresponding through-hole. A gap (7) is arranged between the inner tube plate (3) and the outer tube plate (5) on the same side of the shell (1).

2. The pipe-in-pipe heat exchanger of claim 1, wherein, The inner diameter of the shell (1) is larger than the opening inner diameter of the tube-side end cover (6) facing the outer tube plate (5).

3. The pipe-in-pipe heat exchanger of claim 1, wherein, A center connecting block (701) is arranged at the center of the gap (7), and the center connecting block (701) is fixedly connected with the corresponding inner tube plate (3) and outer tube plate (5).

4. The pipe-in-pipe heat exchanger of claim 1, wherein, A plurality of outer connecting blocks (702) are uniformly arranged in the circumferential direction at the radial outer end of the gap (7), and the outer connecting blocks (702) are fixedly connected with the radial outer side wall of the corresponding inner tube plate (3) and outer tube plate (5).

5. The pipe-in-pipe heat exchanger of claim 1, wherein, The radial outer side of the gap (7) is formed into a closed structure through an annular sealing plate (8), and leak detection holes are arranged on the annular sealing plate (8) and penetrate into the gap (7).

6. The pipe-in-pipe heat exchanger of claim 5, wherein, The annular sealing plate (8) is fixedly connected with the axial end face of the corresponding inner tube plate (3) and outer tube plate (5).

7. The pipe-in-pipe heat exchanger of claim 5, wherein, The annular sealing plate (8) is fixedly connected with the radial outer side face of the corresponding inner tube plate (3) and outer tube plate (5).

8. The pipe-in-pipe heat exchanger of claim 5, wherein, An outer annular flange (501) serving as the annular sealing plate (8) is coaxially arranged on the end face of the outer tube plate (5) facing the inner tube plate (3), and the outer annular flange (501) is fixedly connected with the axial end face of the adjacent inner tube plate (3).

9. The pipe-in-pipe heat exchanger of claim 5, wherein, An inner annular flange (301) serving as the annular sealing plate (8) is coaxially arranged on the end face of the inner tube plate (3) facing the outer tube plate (5), and the inner annular flange (301) is fixedly connected with the axial end face of the adjacent outer tube plate (5).

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