Dissolution sleeve heat exchanger

Abstract

A single-stage sleeve comprises one or more inner pipes and an outer pipe, the outer pipe surrounds the one or more inner pipes, a first partition plate is packaged at a port of a U-shaped elbow, a second partition plate packages a port, facing the U-shaped elbow, of the outer pipe, and a leak detection gap is formed between the first partition plate and the second partition plate. The inner pipe sequentially penetrates through the second partition plate and the leak detection gap and then penetrates through the first partition plate or is communicated with the through hole of the first partition plate, so that the inner pipe is communicated with the U-shaped elbow. The leakage detection gap is clamped between the two independent partition plates, the possibility that steam condensate water is polluted by leakage of welding seams at the connecting positions of the partition plates and the inner pipe is fundamentally eradicated, the two media are completely separated, and the steam condensate water cannot be polluted even if leakage occurs; the leakage point can be found and processed without dismounting the U-shaped elbow, the fault judgment and processing time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a mine heat exchanger, in particular to a digestion sleeve heat exchanger. Background Art

[0002] The digestion sleeve heat exchanger is a pressure vessel used for heat exchange between pulp and steam.

[0003] In the existing design of our unit, multiple single-stage sleeves are connected in series through U-shaped elbows to form a multi-stage sleeve heat exchanger. A single-stage sleeve (a single-section sleeve) includes one or more inner tubes (tube passes) and an outer tube (shell pass), and the outer tube surrounds the one or more inner tubes; both ends of the outer tube are sealed with partition plates, so the ports of the outer tube are connected to the corresponding ports of the U-shaped elbows through the partition plates. The space enclosed in the outer tube is suitable for steam to flow through, and the inner tubes pass through the partition plates and lead into the U-shaped elbows, so that the pulp can be led into the inner tubes of the next single-stage sleeve through the U-shaped elbows. The pulp in the inner tubes is suitable for heat exchange with the steam in the outer tubes.

[0004] It is actually found that the pulp in the inner tubes contains strong alkalinity and abrasiveness, and the steam pressure in the outer tubes is about 7.0 Mpa. The welded joint between the inner tubes and the partition plates is prone to caustic embrittlement leakage, resulting in the pulp in the inner tube ports and / or U-shaped elbows flowing into the outer tubes, contaminating the steam condensate.

[0005] In addition, in the multi-stage sleeve heat exchanger of our unit, the number of U-shaped elbows and partition plates is large; when pulp-steam mixed pollution occurs, it is difficult to quickly find the specific leakage point. Summary of the Utility Model

[0006] The utility model aims to solve at least one of the above-mentioned technical problems, and provides a digestion sleeve heat exchanger, in which the pulp and steam are completely separated, steam condensate pollution is not likely to occur, the time for finding and dealing with leakage points is increased, and the production efficiency is improved.

[0007] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0008] A digestion sleeve heat exchanger includes single-stage sleeves, U-shaped elbows and second partition plates. A plurality of single-stage sleeves are provided, and each single-stage sleeve includes one or more inner tubes and an outer tube. The outer tube surrounds the one or more inner tubes. The ports of the U-shaped elbows are sealed with first partition plates, such as welding, screw connection / riveting with sealing rings, etc. The second partition plates seal the ports of the outer tubes facing the U-shaped elbows, such as welding, screw connection / riveting with sealing rings, etc. A leak detection gap is provided between the first partition plates and the second partition plates. After passing through the second partition plates and the leak detection gap in sequence, the inner tubes pass through the first partition plates or communicate with the through holes of the first partition plates, so that the inner tubes are communicated with the U-shaped elbows.

[0009] Compared with the prior art, the beneficial effects of the present application include: The inner pipe port is connected to the U-shaped elbow through the first partition. There is a leak detection gap and a second partition between the first partition and the outer pipe. It is difficult for the slurry to leak from the connection between the inner pipe and the first partition to the steam chamber of the outer pipe; even if the point where the inner pipe is welded to the second partition cracks and leaks, the brittle leakage can only occur in the leak detection gap; by sandwiching the leak detection gap with two independent partitions and placing the leak detection gap outside, the possibility of weld leakage at the connection between the partition and the inner pipe contaminating the steam condensate is fundamentally eliminated. The two media are completely separated. Even if leakage occurs, it will not contaminate the steam condensate; in the multi-stage casing heat exchanger, the leak detection gaps are independently separated, and the leak points can be quickly detected. The leak points are exposed and easy to handle, improving the time for finding and handling leak points. There is no need to disassemble the U-shaped elbow to find and handle leak points, shortening the time for fault judgment and handling, and improving production efficiency; in the multi-stage casing heat exchanger, the outer pipes are completely separated. Even when slurry leaks into one outer pipe, it is difficult to overflow into the steam chamber of another outer pipe.

[0010] As an improvement of the above technical solution, the inner pipe is provided with a flange adapted to be connected to the inner side of the second partition. The flange is connected to the inner side of the second partition by a sealing ring screw. The second partition is welded to the outer pipe, and the first partition is welded to the U-shaped elbow and the inner pipe.

[0011] As an improvement of the above technical solution, the second partition is welded to the outer pipe, the first partition is welded to the U-shaped elbow, and the part of the inner pipe exposed to the leak detection gap is welded to the first partition and the second partition.

[0012] As an improvement of the above technical solution, the U-shaped elbow includes an elbow main body and two docking heads. One end of the docking head is flange-connected to the corresponding port of the elbow main body, and the other end is welded to the corresponding first partition.

[0013] As an improvement of the above technical solution, the leak detection gap communicates with the atmosphere, and a slurry collection tank is provided below the leak detection gap.

[0014] As an improvement of the above technical solution, a bracket adapted to support the inner pipe is provided inside the outer pipe. The bracket is welded to the inner wall of the outer pipe. The bracket is also adapted to separate the multiple inner pipes in the outer pipe, and the inner pipe can rotate on the bracket.

[0015] As an improvement of the above technical solution, a cone is detachably connected to the port of the inner pipe. The cone is adapted to guide the inner pipe through the corresponding through hole or corresponding notch of the bracket.

[0016] As an improvement of the above technical solution, the bracket is provided with an arc concave part adapted to support the inner pipe.

[0017] As an improvement to the above technical solution, the multiple single-stage sleeves are arranged in sequence in the up and down direction. A steam inlet is provided laterally at one end of the outer tube, and a steam condensate outlet is provided at the lower part of the other end. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings, where:

[0019] Figure 1 is a schematic structural diagram of a digestion sleeve heat exchanger according to an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a partial cross-sectional view showing the digestion sleeve heat exchanger;

[0021] Figure 3 is Figure 2 a partial structural schematic diagram showing the digestion sleeve heat exchanger;

[0022] Figure 4 is Figure 1 a partial cross-sectional view showing the digestion sleeve heat exchanger from the front view angle;

[0023] Figure 5 is a partial cross-sectional view of a single-stage sleeve according to an embodiment of the present invention from the side view angle.

[0024] The drawings are only one specific embodiment of the present invention, and the form and structure of this specific embodiment should not limit the expansion of other embodiments.

[0025] Single-stage sleeve 100, inner tube 110, outer tube 120, steam inlet 121, steam condensate outlet 122, bracket 130;

[0026] U-shaped elbow 200, elbow body 210, docking head 220;

[0027] First partition 310, second partition 320, leak detection gap 330. SPECIFIC EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Refer to Figures 1 to 4, the present utility model provides a dissolution sleeve heat exchanger, which includes a single-stage sleeve 100, a U-shaped elbow 200 and a second partition plate 320. A plurality of single-stage sleeves 100 are provided, and each of them includes one or more inner tubes 110 and an outer tube 120. The outer tube 120 surrounds the one or more inner tubes 110. The port of the U-shaped elbow 200 is encapsulated with a first partition plate 310, such as by welding, screw connection / riveting with a sealing ring, etc. The second partition plate 320 encapsulates the port of the outer tube 120 facing the U-shaped elbow 200, such as by welding, screw connection / riveting with a sealing ring, etc. And a leak detection gap 330 is provided between the first partition plate 310 and the second partition plate 320. After the inner tube 110 passes through the second partition plate 320 and the leak detection gap 330 in sequence, it passes through the first partition plate 310, or communicates with the through hole of the first partition plate 310, so that the inner tube 110 communicates with the U-shaped elbow 200.

[0030] Referring to Figure 1 , Figure 2 and Figure 4 , it can be understood that the outer tube 120 is provided with a steam inlet 121 and a steam condensate outlet 122.

[0031] The operation process of the present utility model is as follows: Referring to Figure 2 , Figure 4 , the single-stage sleeve 100 is assembled. One or more inner tubes 110 pass through the corresponding through holes of the second partition plate 320 and the first partition plate 310, and a gap is left between the first partition plate 310 and the second partition plate 320. Among them, the first partition plate 310 tightly sleevs, seals the inner tube 110 by sleeving, or welds the inner tube 110. The second partition plate 320 tightly sleevs, seals the inner tube 110 by sleeving, connects the inner tube 110 by screw with a sealing flange, or welds the inner tube 110. The outer tube 120 surrounds the one or more inner tubes 110, and the second partition plate 320 encapsulates the corresponding port of the outer tube 120, completing the assembly of the single-stage sleeve 100;

[0032] The multi-stage heat exchanger is assembled. The port of the U-shaped elbow 200 is encapsulated with the first partition plate 310, completing the assembly of the heat exchanger;

[0033] For heat exchange work, steam flows through the cavity of the outer tube 120. Referring to Figure 4 the V 2in and V 2out directions, pulp flows through the inner tube 110 and the U-shaped elbow 200. Referring to Figure 4 the V 1in and V 1out directions, the pulp and the steam flow in the same or opposite directions, and the pulp is suitable for heat exchange with the steam through the peripheral wall of the inner tube 110.

[0034] Compared with the prior art, the beneficial effects of the present application include: the port of the inner tube 110 is connected to the U-shaped elbow 200 through the first partition 310. There is a leak detection gap 330 and a second partition 320 between the first partition 310 and the outer tube 120. It is difficult for the slurry to leak from the connection between the inner tube 110 and the first partition 310 to the steam chamber of the outer tube 120; even if the point where the inner tube 110 is welded to the second partition 320 cracks and leaks, the brittle crack leakage can only occur in the leak detection gap 330; by sandwiching the leak detection gap 330 with two independent partitions and placing the leak detection gap 330 outside, it fundamentally eliminates the possibility of the weld at the connection between the partition and the inner tube 110 leaking and contaminating the steam condensate. The two media are completely separated. Even if there is a leak, it will not contaminate the steam condensate; in the multi-stage casing heat exchanger, the leak detection gaps are independently separated, and the leak points can be quickly detected. The leak points are exposed and easy to handle, which improves the time for finding and dealing with the leak points. There is no need to disassemble the U-shaped elbow 200 to find and deal with the leak points, shortens the time for fault judgment and handling, and improves production efficiency; in the multi-stage casing heat exchanger, the outer tubes 120 are completely separated. Even when slurry leaks into one outer tube 120, it is difficult to overflow into the steam chamber of another outer tube 120.

[0035] During the heat treatment of the slurry, the inner tube 110 is a long pipe fitting with a length of dozens of meters. Its cost is more expensive than that of the partition and the U-shaped elbow 200. After the inner tube 110 is used for a certain period of time, it needs to be rotated and adjusted in position so that the worn and thinned lower edge becomes the upper edge; in addition, the inner tube 110 and the outer tube 120 are long pipe fittings. When the inner tube 110 and the outer tube 120 are both connected to the second partition 320 through flanges, the accuracy requirements for the flange mounting holes are extremely high. Preferably, the inner tube 110 is provided with a flange suitable for connecting to the inner side of the second partition 320. The flange is connected to the inner side of the second partition 320 through a sealing ring screw. The second partition 320 is welded to the outer tube 120, the first partition 310 is welded to the U-shaped elbow 200 and the inner tube 110, and the inner tube 110 does not have an additional flange to connect to the first partition 310. Without increasing the size of the inner tube 110, the inner tube 110 can be provided with a larger through-hole diameter. In addition, preferably, the part of the inner tube 110 exposed to the leak detection gap 330 is welded to the first partition 310. In the present utility model, when it is necessary to loosen the inner tube 110 for screwing and adjusting the position, the weld marks between the second partition 320 and the outer tube 120, the weld marks between the U-shaped elbow 200 and the first partition 310, and the weld marks between the inner tube 110 and the first partition 310 are ground, and then the end faces of the second partition 320, the outer tube 120, and the first partition 310 are ground and polished. The polished part of the outer wall of the inner tube 110 is built-up welded and / or polished, and then the heat exchanger is reassembled; before and after maintenance, the inner tube 110 retains the flange connection to the first partition 310, the flange of the inner tube 110 and the second partition 320 maintain stable sealing performance, and the second partition 320, the outer tube 120, and the first partition 310 become shorter after the end faces are ground, and their impact on the sealed assembly of the heat exchanger is extremely small.

[0036] In some embodiments of the present utility model, all flanges of the inner pipe 110 are omitted, and the inner pipe is completely set as a through pipe, further simplifying its casting mold. Refer to Figures 1 to 4 , specifically, the second partition plate 320 is welded to the outer pipe 120, the first partition plate 310 is welded to the U-shaped elbow 200, and the part of the inner pipe 110 exposed to the leak detection gap 330 is welded to the first partition plate 310 and the second partition plate 320, that is, the outer side of the first partition plate 310 is welded to the inner pipe 110, and the outer side of the second partition plate 320 is welded to the inner pipe 110; when the inner pipe 110 cracks and leaks due to reasons such as poor soldering and thinning at the position where the inner pipe 110 is welded to the second partition plate 320, the pulp in the inner pipe 110 can only leak into the leak detection gap 330.

[0037] Refer to Figures 1 to 4 , in some embodiments of the present utility model, the U-shaped elbow 200 includes an elbow main body 210 and two docking heads 220. One end of the docking head 220 is flange-connected to the corresponding port of the elbow main body 210, and then the other end is welded to the corresponding first partition plate 310. When the end of the U-shaped elbow 200 is difficult to repair, the docking head 220 can be directly replaced, reducing the maintenance cost of the U-shaped elbow 200.

[0038] In some embodiments of the present utility model, the leak detection gap 330 communicates with the atmosphere, and a pulp collection tank is arranged below the leak detection gap 330.

[0039] The base material is damaged during welding, and there is a risk of leakage in the inner pipe 110; during the manufacturing process of the equipment, reducing the welding amount as much as possible is one of the effective measures to ensure that the equipment does not leak. Refer to Figure 2 、 Figure 3 and Figure 5 , in some embodiments of the present utility model, a bracket 130 suitable for supporting the inner pipe 110 is arranged in the outer pipe 120. The bracket 130 is welded to the inner wall of the outer pipe 120. The bracket 130 is also suitable for separating multiple inner pipes 110 in the outer pipe 120 to ensure the heat exchange effect of the multiple inner pipes 110, and the inner pipe 110 can rotate on the bracket 130. The inner pipe 110 does not need to be welded and fixed to the bracket 130, reducing the welding points of the inner pipe 110 and lowering the leakage risk; the multiple inner pipes 110 are independently separated. When a single pipe is damaged, it is convenient to draw out the inner pipe 110 for repair welding. Affected by the physical properties of the pulp density, the lower edge part of the inner wall of the inner pipe 110 wears faster, and the upper edge of the inner wall of the inner pipe 110 wears slower. After the equipment operates for a certain period, a single inner pipe 110 can be rotated 180°, adjusting the positions of the upper and lower edges of the inner wall of the inner pipe 110 to improve the service life of the equipment.

[0040] In practice, the aperture diameter of the outer tube 120 is about 630 mm, and the aperture diameter of the outer tube 120 allows workers to drill into it and facilitates the workers to install the support 130 into the outer tube 120. Specifically, the support 130 is arranged at a relatively shallow position of the outer tube 120, such as a position about 30 cm inward from the port of the outer tube 120. The support 130 is convenient to place and also facilitates the welding construction of the support 130.

[0041] The width of the support 130 is preferably 100 ± 20 mm and is preferably made of Q345R.

[0042] In some embodiments of the present invention, a tapered block is detachably connected to the port of the inner tube 110, and the tapered block is adapted to guide the inner tube 110 to pass through the corresponding through hole or corresponding notch of the support 130. Under the guidance of the tapered tip of the tapered block, the inner tube 110 penetrates into the outer tube 120 and passes through the corresponding orifice of the support 130. After the guidance is completed, the tapered block disengages from the inner tube 110, and the inner tube 110 is supported on the corresponding through hole or notch.

[0043] Preferably, in the single-stage casing 100, three inner tubes 110 are provided, and the three inner tubes 110 are distributed in a triangular pattern.

[0044] In some embodiments of the present invention, the support 130 is provided with an arc concave portion adapted to support the inner tube 110, which facilitates the rotation of the inner tube 110 and ensures that the inner tube 110 flows the pulp for heat exchange more smoothly.

[0045] Refer to Figure 4 In some embodiments of the present invention, the multiple single-stage casings 100 are arranged in sequence in the up and down direction. A steam input port 121 is provided laterally at one end of the outer tube 120, and a steam condensate outlet 122 is provided at the lower part of the other end.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the technical solutions of the present invention.

Claims

1. A dissolution sleeve heat exchanger, characterized in that, Comprising: A plurality of single-stage sleeves, each including one or more inner tubes and an outer tube, the outer tube surrounding the one or more inner tubes; A U-shaped elbow with a first partition plate sealed at its port; A second partition plate sealing the port of the outer tube facing the U-shaped elbow, and a leak detection gap is provided between the first partition plate and the second partition plate. After passing through the second partition plate and the leak detection gap in sequence, the inner tube passes through the first partition plate or communicates with the through hole of the first partition plate, so that the inner tube communicates with the U-shaped elbow.

2. The dissolution sleeve heat exchanger according to claim 1, wherein The inner tube is provided with a flange adapted to be connected to the inner side of the second partition plate, and the flange is connected to the inner side of the second partition plate by a sealing ring screw. The second partition plate is welded to the outer tube, and the first partition plate is welded to the U-shaped elbow and the inner tube.

3. The dissolution sleeve heat exchanger according to claim 1, wherein The second partition plate is welded to the outer tube, the first partition plate is welded to the U-shaped elbow, and the part of the inner tube exposed in the leak detection gap is welded to the first partition plate and the second partition plate.

4. The dissolution sleeve heat exchanger according to any one of claims 1 to 3, characterized in that, The U-shaped elbow includes an elbow body and two docking heads. One end of the docking head is flange-connected to the corresponding port of the elbow body, and the other end is welded to the corresponding first partition plate.

5. The dissolution sleeve heat exchanger according to any one of claims 1 to 3, characterized in that, The leak detection gap communicates with the atmosphere, and a pulp collection tank is provided below the leak detection gap.

6. The dissolution sleeve heat exchanger according to any one of claims 1 to 3, characterized in that A support adapted to support the inner tube is provided inside the outer tube. The support is welded to the inner wall of the outer tube, and the support is also adapted to separate the multiple inner tubes in the outer tube. The inner tube can rotate on the support.

7. The dissolution sleeve heat exchanger according to claim 6, wherein A cone is detachably connected to the port of the inner tube, and the cone is adapted to guide the inner tube to pass through the corresponding through hole or corresponding notch of the support.

8. The dissolution sleeve heat exchanger according to claim 6, wherein The support is provided with an arc concave portion adapted to support the inner tube.

9. The dissolution sleeve heat exchanger according to any one of claims 1 to 3, characterized in that, The plurality of single-stage sleeves are arranged in sequence in the up and down direction. A steam input port is provided laterally at one end of the outer tube, and a steam condensate outlet is provided at the lower part of the other end.

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