Heat exchanger anti-collision structure and method of use thereof

Abstract

The application provides a heat exchanger anti-collision structure and a use method thereof. The anti-collision structure comprises an anti-collision sleeve, which is installed on the inner side of a cylinder, and is communicated with a shell side connecting pipe and a connecting pipe flange. A hole is formed in the circumferential wall surface of the anti-collision sleeve, and a disc is arranged at the bottom of the anti-collision sleeve. The disc has an arched bottom. An anti-collision ring is arranged in the anti-collision sleeve. The circumferential wall surface of the anti-collision ring is alternately provided with a first large hole array and a first small hole array. The circumferential wall surface of the anti-collision ring is alternately provided with a second large hole array and a second small hole array which are matched with the anti-collision sleeve. A second guide rail groove is arranged on the inner wall of the anti-collision sleeve. The anti-collision ring is matched with the second guide rail groove through a fixing clasp on the anti-collision ring, and can rotate in the anti-collision sleeve. The inner wall of the shell side connecting pipe is provided with a vertical first guide rail groove which is matched with the fixing clasp. The first guide rail groove is communicated with the second guide rail groove, and the anti-collision ring can be slid upward and collected in the shell side connecting pipe. The application can avoid direct impact of fluid on the tube bundle, has good anti-collision effect, and can realize three-grade adjustment of flow rate.

Description

Technical Field

[0001] This invention relates to anti-impact structures, specifically to an anti-impact structure for a heat exchanger and its method of use. Background Technology

[0002] An anti-scouring structure installed at the shell-side inlet of the heat exchanger can prevent the fluid from scouring and corroding the heat exchange tubes.

[0003] Currently, heat exchanger anti-impact measures are mostly achieved by welding anti-impact baffles onto the tube bundle. However, due to the small weld surface, these baffles are not very robust. When the inlet fluid washes over the anti-impact baffles, the vibration of the baffles causes the tube bundle to vibrate. Furthermore, when the tube bundle is subjected to localized high temperatures, resulting in a significant temperature difference between its wall and the shell, substantial thermal stress will be generated in both the tube bundle and the shell. This will exacerbate the vibration of the anti-impact baffles and the tube bundle, and may even cause the anti-impact baffles to detach, leading to corrosion of the heat exchange tubes. Summary of the Invention

[0004] Purpose of the invention: The first purpose of this invention is to provide a heat exchanger anti-impact structure with good anti-impact effect and the ability to extend the service life of the tube bundle; the second purpose of this invention is to provide a method of using the heat exchanger anti-impact structure.

[0005] Technical solution: The present invention provides a heat exchanger anti-impact structure, including an anti-impact sleeve, which is installed inside the shell and connects to the shell-side nozzle and nozzle flange; the anti-impact sleeve has a hole on its circumferential wall and a disc at its bottom with an arched bottom.

[0006] During heat exchanger operation, fluid flows from the shell-side nozzle to the anti-surge sleeve, then splashes on a disc, and flows into the shell through holes in the anti-surge sleeve. This disc stabilizes the fluid flow. Compared to traditional anti-surge baffles, the anti-surge structure of this invention is welded to the shell, making it more robust and less prone to detachment during use. Furthermore, the holes in the anti-surge sleeve are located on the side, allowing the fluid to flow along them into the heat exchanger shell, thus avoiding direct impact on the tube bundle and significantly reducing vibrations caused by fluid impact on the tube bundle. This achieves excellent anti-surge performance and extends the service life of the tube bundle.

[0007] Furthermore, the anti-impact sleeve is provided with an anti-impact ring. The circumferential wall of the anti-impact sleeve is alternately provided with a first large hole array and a first small hole array. The circumferential wall of the anti-impact ring is alternately provided with a second large hole array and a second small hole array adapted to the anti-impact sleeve. Rotating the anti-impact ring changes the overlap relationship of the holes, which can change the flow cross-sectional area and adjust the flow velocity.

[0008] This technical solution can change the flow rate of the fluid entering the heat exchanger shell, which can meet the needs of specific operating conditions. During the use of the heat exchanger, the medium, flow rate, and temperature are different. Different settings can be used for different operating conditions and heat exchange requirements to achieve better heat exchange results.

[0009] Furthermore, the inner wall of the anti-impact sleeve is provided with a second guide groove, and the anti-impact ring cooperates with the second guide groove through the fixing slot on it to achieve rotation in the anti-impact sleeve.

[0010] Furthermore, the inner wall of the shell-side connector is provided with a vertical first guide groove that is adapted to the fixed bayonet. The first guide groove is connected to the second guide groove, and the anti-impact ring can slide upward and retract into the shell-side connector.

[0011] The second aspect of the present invention provides a method of using a heat exchanger anti-impact structure, comprising: a first flow rate, wherein the anti-impact ring is retracted into the shell-side nozzle; a second flow rate, wherein the second large hole array on the anti-impact ring coincides with the first large hole array on the anti-impact sleeve; a third flow rate, wherein the second small hole array on the anti-impact ring coincides with the first large hole array on the anti-impact sleeve; the first, second, and third flow rates are increased sequentially.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the fluid flows out from the hole in the inner wall of the cylinder through the anti-impact structure, which can avoid direct scouring of the tube bundle, greatly improve the corrosion problem of the tube bundle, and extend the service life of the tube bundle. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the heat exchanger anti-impact structure in an embodiment of this application;

[0015] Figure 2 This is a schematic diagram of the anti-impact sleeve in the embodiments of this application;

[0016] Figure 3 This is a schematic diagram of the anti-impact ring structure in an embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the heat exchanger anti-impact structure in one operating state in the embodiments of this application;

[0018] Figure 5 This is a schematic diagram of the two-stage operation of the heat exchanger anti-impact structure in the embodiments of this application;

[0019] Figure 6 yes Figure 5 A partial view;

[0020] Figure 7 This is a schematic diagram of the three operating states of the heat exchanger anti-impact structure in the embodiments of this application;

[0021] Figure 8 yes Figure 7 A partial view;

[0022] Figure 9 This is a flow velocity cloud diagram of the heat exchanger anti-impact structure in the embodiments of this application;

[0023] Figure 10 This is a flow velocity cloud diagram of the two-stage anti-impact structure of the heat exchanger in the embodiments of this application;

[0024] Figure 11 This is a flow velocity cloud diagram of the three-level anti-impact structure of the heat exchanger in the embodiments of this application;

[0025] Reference numerals: 1, cylinder; 2, nozzle flange; 3, shell-side nozzle; 4, anti-impact sleeve; 5, anti-impact ring; 6, first guide rail groove; 7, fixing bayonet. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0027] like Figures 1 to 3 The heat exchanger anti-impact structure shown includes an anti-impact sleeve 4 and an anti-impact ring 5 disposed within the anti-impact sleeve 4. The anti-impact sleeve 4 comprises a hollow cylinder and a disc welded to the bottom of the hollow cylinder, the disc having an arched bottom. The anti-impact sleeve 4 is installed inside the shell 1 and connects to the shell-side nozzle 3 and the nozzle flange 2.

[0028] like Figure 2 As shown, alternating and uniform arrays of large and small holes are formed on the circumferential wall of the anti-impact sleeve. There are two arrays of both large and small holes, and both large and small holes are elongated, waist-shaped holes along the circumferential direction. The height of the large hole is D1, and the height of the small hole is D2, where D1 > D2.

[0029] like Figure 3 As shown, the anti-impact ring 5 is a hollow cylindrical structure. Its circumferential wall surface is alternately and evenly provided with a second large hole array and a second small hole array adapted to the anti-impact sleeve 4. There are two of each type of hole array, and both the second large hole and the second small hole are circular. The diameter of the second large hole is d1, and the diameter of the second small hole is d2, where d1 > d2.

[0030] A pair of second guide rail grooves are provided circumferentially on the top of the inner wall of the anti-impact sleeve 4, and a pair of fixing slots 7 are provided on the top of the outer wall of the anti-impact ring 5. The anti-impact ring 5 can rotate 90° in the anti-impact sleeve 4 to change the overlap relationship of the holes and thus change the flow cross-sectional area by means of the fixing slots 7 on its fixing slots 7. In addition, a pair of vertical first guide rail grooves 6 are provided on the inner wall of the shell-side nozzle 3, which are adapted to the fixing slots 7. The first guide rail grooves 6 are connected to the corresponding second guide rail grooves, and the anti-impact ring 5 can slide upward and retract into the shell-side nozzle 3.

[0031] The following is an introduction to the usage of the anti-impact structure of the heat exchanger.

[0032] Based on the cooperation of the anti-surge sleeve 4 and the anti-surge ring 5, the heat exchanger's anti-surge structure can achieve three-level flow rate adjustment. Specifically,

[0033] like Figure 4 As shown, in the first gear, the anti-impact ring 5 is retracted into the shell-side connecting pipe 3. At this time, the fixing slot 7 is at the top of the first guide rail groove 6. After the fluid enters the shell-side connecting pipe 3, it directly enters the heat exchanger shell through the hole on the anti-impact sleeve 4, achieving a buffering effect. At this time, the flow cross-sectional area of ​​the fluid passing through the anti-impact structure is the largest.

[0034] like Figure 5 and Figure 6 As shown, in the second gear, the anti-impact ring 5 enters the anti-impact sleeve 4 downwards along the first guide groove 6, and the fixing slot 7 reaches the bottom of the first guide groove 6. At this time, the second large hole array on the anti-impact ring 5 coincides with the first large hole array on the anti-impact sleeve 4. Thus, when the fluid flows into the heat exchanger shell, the flow cross-sectional area decreases. With the same fluid flow rate, the reduced flow cross-sectional area leads to an increased fluid velocity. Therefore, the flow velocity in the second gear is greater than that in the first gear.

[0035] like Figure 7 and Figure 8 As shown, in the third gear, the fixing slot 7 of the anti-impact ring 5 is rotated 90° along the second guide rail groove. After rotating 90°, the fixing slot 7 abuts against the end of the second guide rail groove, thus fixing it in place. At this time, the second small hole array on the anti-impact ring 5 coincides with the first large hole array on the anti-impact sleeve 4, further reducing the flow cross-sectional area and reaching the maximum flow velocity.

[0036] like Figures 9 to 11 The diagram shows the velocity cloud at the three speed settings. It can be seen that the flow velocity at the interface increases sequentially, with the third speed setting being the highest and the first speed setting being the lowest. It can also be seen that the fluid flows out laterally, avoiding direct scouring of the tube bundle and providing a good buffering effect.

[0037] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A heat exchanger anti-impact structure, characterized in that, Includes an anti-impact sleeve (4), which is installed inside the cylinder (1) and connects the shell-side nozzle (3) and the nozzle flange (2); the anti-impact sleeve (4) has a hole on its circumferential wall surface and includes a hollow cylinder and a disc welded to the bottom of the hollow cylinder, the disc having an arched bottom; The anti-impact sleeve (4) is provided with an anti-impact ring (5). The anti-impact sleeve (4) has an alternating array of first large holes and an array of first small holes on its circumferential wall. The anti-impact ring (5) has an alternating array of second large holes and an array of second small holes adapted to the anti-impact sleeve (4). Rotating the anti-impact ring (5) changes the overlap relationship of the holes, which can change the flow cross-sectional area and adjust the flow rate. The inner wall of the anti-impact sleeve (4) is provided with a second guide groove. The anti-impact ring (5) cooperates with the second guide groove through the fixing slot (7) on it, and can rotate 90° in the anti-impact sleeve (4) to change the coincidence relationship of the holes. The inner wall of the shell-side connector (3) is provided with a vertical first guide groove (6) that is adapted to the fixed bayonet (7). The first guide groove (6) is connected to the second guide groove. The anti-impact ring (5) can slide upward and retract into the shell-side connector (3). The method of using the heat exchanger anti-impact structure includes: at the first flow rate, the anti-impact ring (5) is placed in the shell-side connecting pipe (3), at which time the fixing slot (7) is at the top of the first guide rail groove (6); at the second flow rate, the anti-impact ring (5) moves downward along the first guide rail groove (6) into the anti-impact sleeve (4), and the fixing slot (7) reaches the bottom of the first guide rail groove (6), so that the second large hole array on the anti-impact ring (5) coincides with the first large hole array on the anti-impact sleeve (4); at the third flow rate, the fixing slot (7) of the anti-impact ring (5) is rotated 90° along the second guide rail groove, and the fixing slot (7) abuts against the end of the second guide rail groove after rotating 90°, so that the second small hole array on the anti-impact ring (5) coincides with the first large hole array on the anti-impact sleeve (4); the first, second and third flow rates increase sequentially.

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