A shell-and-tube heat exchanger, a leak detection method and a storage system

Abstract

The application discloses a shell-and-tube heat exchanger, which comprises a shell, a heat exchange pipe assembly, a sealing disc and a sealing head. The heat exchange pipe assembly is arranged in the shell and is connected with the shell in a sleeving mode. The heat exchange pipe assembly is connected with the sealing disc in a detachable mode and penetrates through the sealing disc. The sealing head is arranged on the side of the sealing disc which is away from the heat exchange pipe assembly and is connected with the side wall of the sealing disc in a detachable mode. In the leakage detection process, the heat exchange pipe assembly is pulled out from the sealing disc after being pressurized by nitrogen or water. After the heat exchange pipe assembly is disassembled, the leakage points are eliminated by welding, so that the heat exchange pipe assembly can continue to participate in heat exchange, the working efficiency of the heat exchanger can be kept as the initial state, the problem that the efficiency of the heat exchanger is reduced due to a large amount of plugging is directly avoided, and the cost of enterprises is directly reduced. The application also discloses a leakage detection method of the shell-and-tube heat exchanger and a storage system of the leakage detection method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange tube leak detection, and particularly relates to a shell-and-tube heat exchanger, a leak detection method thereof and a storage system. BACKGROUND

[0002] The shell-and-tube heat exchanger is a heat exchanger most widely used in chemical enterprises, which mainly comprises a shell, a tube sheet, heat exchange tubes, a head, a baffle and the like. The working principle is that heat exchange is performed between a medium in the heat exchange tubes and a medium outside the heat exchange tubes. In a normal case, when the medium in the heat exchange tubes or the medium outside the heat exchange tubes is corrosive, in a long-period continuous operation process, the heat exchange tubes will be corroded by the medium for a long time, and gradually cracks or sand holes will appear, so that the two original media in and outside the heat exchange tubes will be mixed together, which affects the normal production, so the enterprises often perform leak detection and leak elimination on the heat exchanger during annual overhaul.

[0003] At present, there are two methods of water leak detection and nitrogen leak detection. The water leak detection method is to inject water into the heat exchanger, and after the water is filled, the water in the heat exchanger is pressurized by a water pump to a certain pressure to detect the leak of the heat exchanger. After the leak detection is completed and the mark is made, the pressure is released and the water is drained, and then the leak is blocked. If the heat exchanger is large and the leakage is serious, the water pressure will leak at a lower pressure, and the water must be drained and blocked. After the leak blocking is completed, the water is filled and pressure tested, and the process is repeated, which increases the heat exchanger maintenance time. Because the water filling and pressurizing need a lot of time, the leakage position needs to be dried before the fire welding and leak elimination, otherwise the quality of the fire welding and leak elimination will be affected. If there is a flammable medium in the heat exchanger, nitrogen must be replaced, and the operation of fire welding and leak elimination can be performed after the nitrogen is qualified, otherwise fire and explosion will occur, which will endanger the safety of personnel and equipment. The nitrogen leak detection method is to use nitrogen to pressurize and leak test the shell-and-tube heat exchanger, and then perform the leak blocking and fire operation, without the need for replacement treatment, so the leak elimination process is relatively fast, and the maintenance and leak elimination time is saved.

[0004] Although the above characteristics are obtained by using nitrogen leakage test, both of them have the common problem that the leakage elimination process is by plugging method, the essence of which is to plug the two ends of the leaking heat exchange tube to prevent the medium that should flow into the heat exchange tube from entering the heat exchange tube, that is, the medium no longer enters the heat exchange tube and no longer participates in heat exchange, so the number of heat exchange tubes participating in work will be reduced. If a small number of heat exchange tubes are plugged in the heat exchanger, it has little effect on the working efficiency of the heat exchanger, but when the number of plugged heat exchange tubes is large or even accounts for more than half of the total number, only half of the heat exchange tubes are left to participate in heat exchange work, which directly leads to a significant reduction in the heat exchange effect of the heat exchanger, causing the related production process parameters before and after the device or section to be in an abnormal state, which has a huge negative impact on normal production, resulting in low production efficiency and high production cost. Ultimately, the only way out is to replace the new heat exchanger, which increases the maintenance cost or fixed asset cost. SUMMARY

[0005] In order to solve the problem that the frequent plugging will greatly reduce the working efficiency of the heat exchanger and increase the cost of the enterprise, the present application provides a tube heat exchanger, which is composed of a heat exchange tube assembly and a packaging disc to form a detachable tube heat exchanger, the heat exchange tube is directly disassembled from the heat exchanger for repair welding, and the repaired heat exchange tube can continue to participate in heat exchange work.

[0006] In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0007] A tube heat exchanger, comprising:

[0008] A shell.

[0009] A heat exchange tube assembly arranged in the shell and sleeved with the shell, used for being drawn out from the shell to the outside of the shell, and repaired by plugging and inserting or clamping.

[0010] A packaging disc fixed to the end of the shell and detachably connected with the heat exchange tube assembly, the heat exchange tube assembly being inserted into the packaging disc to limit the position of the heat exchange tube assembly in the shell.

[0011] A head arranged on the side of the packaging disc away from the heat exchange tube assembly and detachably connected with the packaging disc.

[0012] Compared with the prior art, the present application has the following advantages:

[0013] The sealing disc connects the heat exchange pipes by penetrating and limits the heat exchange pipe assembly between the two end covers and the shell after connecting with the covers to form a column tube heat exchanger with detachable interior and firm connection exterior. In the working process, two media participating in heat exchange enter the shell and the heat exchange pipe assembly respectively to exchange heat. In the leakage checking process, the heat exchange pipe assembly is pulled out of the sealing disc after being pressed by nitrogen or water, and the heat exchange pipe assembly is disassembled to eliminate the leakage points by welding, so that the heat exchange pipe assembly continues to participate in heat exchange, maintains the working efficiency of the heat exchanger as the initial state, directly avoids the problem of reducing the efficiency of the heat exchanger due to large leakage plugging amount, and directly reduces the cost of the enterprise.

[0014] Further preferably, the heat exchange pipe assembly comprises:

[0015] The first pipe disc is arranged on the side of the sealing disc away from the cover and detachably connected with the sealing disc.

[0016] The heat exchange pipe is arranged on the first pipe disc, one end of the heat exchange pipe penetrates the first pipe disc and is inserted into the sealing disc, and the pipe wall of the heat exchange pipe is fixedly connected with the first pipe disc.

[0017] The second pipe disc is arranged on the pipe wall of the heat exchange pipe in a fixed sleeve connection mode, located at the other end of the heat exchange pipe, the other end of the heat exchange pipe extends out of the second pipe disc, the heat exchange pipe is used for leading the first medium into the first pipe disc and flowing out of the second pipe disc, so that the first medium exchanges heat with the second medium flowing outside the heat exchange pipe.

[0018] The connecting disc is sleeved on the side wall of the second pipe disc, the inner wall of the connecting disc is detachably connected with the end face of the second pipe disc, and the outer wall of the connecting disc is detachably connected with the cover.

[0019] By adopting the above technical scheme, if it is determined that a certain heat exchange pipe has a leakage point in the leakage checking process, the second pipe disc in which the heat exchange pipe is arranged is taken off from the connecting disc, the first pipe disc is pushed, the first pipe disc drives the heat exchange pipe to move, the heat exchange pipe drives the second pipe disc to move and is exposed, so that the heat exchange pipe can be directly welded and the space for welding the leakage point is provided.

[0020] Further preferably, the number of the first pipe discs is multiple, each first pipe disc is arranged in a sleeved mode, the first pipe discs are arranged in a concentric ring shape, and each first pipe disc is detachably connected with the sealing disc through the heat exchange pipe, and the sealing disc is used for limiting the relative position between adjacent first pipe discs.

[0021] By adopting the above technical scheme, when working normally or checking leakage by nitrogen pressure, the multiple first pipe discs arranged in a concentric ring shape are fixed on the cover through the sealing disc, so that the structure of the heat exchange pipe assembly is more stable, and normal heat exchange or nitrogen leakage checking can be performed. When welding is needed, the first pipe disc is timely detached from the sealing disc to provide convenience for exposing the heat exchange pipe.

[0022] Further preferably, the number of the second tube discs is multiple, each of the second tube discs is sleeved together in a concentric ring shape, the inner wall of the connecting disc is inserted into the surface of each of the second tube discs to limit the relative position between adjacent second tube discs, and the second tube disc is used to drive the heat exchange tube and the first tube disc to move by plugging when repairing the leakage point.

[0023] By using the above technical scheme, when working normally or carrying out nitrogen pressure test, the relative position between each of the adjacent two second tube discs in the concentric ring shape is fixed by the connecting disc, so that the heat exchange tube assembly can carry out normal heat exchange or nitrogen test.

[0024] Further preferably, the internal structure of the connecting disc is the same as that of the packaging disc, and the packaging disc is provided with:

[0025] A packaging groove is arranged on the inner wall of the packaging disc and is inserted into the end of the heat exchange tube;

[0026] A packaging tube head is arranged in the packaging groove, is inserted into the heat exchange tube and is tightly connected with the inner wall of the heat exchange tube, and is used to seal the heat exchange tube after being combined with the packaging groove.

[0027] By using the above technical scheme, the packaging tube head and the packaging groove are sealed from the inside and outside of the heat exchange tube respectively, the packaging disc seals the heat exchange tube, the first tube disc and the second tube disc, and the medium in the shell side is prevented from mixing with the medium in the tube side to lose the heat exchange effect.

[0028] The application further discloses a leakage detection method of the tube-type heat exchanger.

[0029] S601 respectively obtains data information of the packaging disc and the heat exchange tube assembly.

[0030] S602 establishes a virtual model according to the data information.

[0031] S603 injects nitrogen or water into the packaging disc to carry out pressure test.

[0032] S604 obtains the heat exchange tube with water leakage on the first tube disc of the virtual model by the pressure change, and locks the position of the heat exchange tube.

[0033] S605 extracts the heat exchange tube and the second tube disc where the heat exchange tube is located.

[0034] S606 finds the leakage point of the heat exchange tube.

[0035] S607 repairs the leakage point.

[0036] The technical scheme is adopted, so that the process includes collecting data, establishing a model, pressing and leaking, locking the heat exchange pipe, extracting the heat exchange pipe, finding the leakage point and repairing the leakage point, a virtual model of the column packaging disc and the heat exchange pipe assembly is established through the obtained data information, the packaging disc and the heat exchange pipe assembly can be intuitively presented on the computer, and each heat exchange pipe is marked and locked, which provides an accurate position basis for pressing and finding the heat exchange pipe with a leakage point, so that the specific position of the leakage point can be accurately found and targeted repair welding is performed, so that the heat exchange pipe returns to the heat exchange state, and the heat exchange efficiency of the column tube heat exchanger is improved to the initial state at the time of delivery.

[0037] Further optimization is that S601 obtains data information of the packaging disc and the heat exchange pipe assembly, including:

[0038] S701 obtains data information of the packaging disc to obtain packaging disc data.

[0039] S702 obtains data information of the heat exchange pipe assembly to obtain heat exchange pipe assembly data.

[0040] The technical scheme is adopted, and accurate data basis is provided for obtaining the virtual model of the packaging disc and the virtual model of the heat exchange pipe assembly.

[0041] Further optimization is that S602 establishes a virtual model according to the data information, including:

[0042] S801 reads the packaging disc data and the heat exchange pipe assembly data.

[0043] S802 obtains the position of the heat exchange pipe at the center of the packaging disc as the center coordinate, divides the heat exchange pipes on the packaging disc, and establishes a coordinate system.

[0044] S803 places the packaging disc data and the heat exchange pipe data into the coordinate system respectively to obtain a data model.

[0045] S804 associates the data model with the packaging disc and the heat exchange pipe respectively to mark the heat exchange pipe to obtain a virtual model.

[0046] The technical scheme is adopted, the heat exchange pipe at the center is defined as the center coordinate, a virtual concentric circle coordinate system is established by simulating the physical packaging disc, the size of the packaging disc and the number of heat exchange pipes can be corresponded to the virtual model, the position of each heat exchange pipe is accurately determined through the data model, and accurate data basis is provided for subsequent leakage detection and finding of the heat exchange pipe with a leakage point.

[0047] Further optimization is that S803 places the packaging disc data and the heat exchange pipe data into the coordinate system respectively to obtain a data model, including:

[0048] S901 associates the position of the geometric center of the packaging disc with the circle point coordinate of the coordinate system.

[0049] S902 associates and corresponds the position of each heat exchange tube with the coordinates in the coordinate system.

[0050] S903 corresponds the heat exchange tube located at the geometric center of the packaging disc with the circle point coordinates to obtain a data model.

[0051] The above technical scheme can place the physical packaging disc and each heat exchange tube into the coordinate system, and the data model obtained by association and correspondence can reproduce the position of the heat exchange tube, thereby providing accurate basis for finding the leaking heat exchange tube and quickly finding the specific position of the leaking heat exchange tube.

[0052] Further optimization is a storage system of a tube-type heat exchanger leak detection method, comprising:

[0053] The acquisition module is configured to acquire image information of the packaging disc and the heat exchange tube assembly.

[0054] The processing module is in data connection with the acquisition module and is configured to convert the image information into data information.

[0055] The modeling module is in data connection with the processing module and is configured to establish a virtual model according to the data information.

[0056] The analysis module is in data connection with the modeling module and the acquisition module, and is configured to associate and correspond the leaking heat exchange tube in the image information with the leaking heat exchange tube in the virtual model, and lock the position of the leaking heat exchange tube.

[0057] The above technical scheme transmits the acquired image information to the processing module by the acquisition module, converts the image information into data information by the processing module, and transmits the data information to the modeling module, and establishes a virtual model by the modeling module. In the process of pressure test and leak detection, the analysis module locks the position of the leaking heat exchange tube in real time, thereby forming a complete leak detection process and providing accurate position basis for subsequent repair welding. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 It is a structural schematic diagram of the embodiment one.

[0059] Figure 2 It is a structural schematic diagram of the heat exchange tube assembly in the embodiment one.

[0060] Figure 3 It is a structural schematic diagram of the packaging disc in the embodiment one.

[0061] Figure 4 It is a structural schematic diagram of the connection between the packaging disc and the shell in the embodiment one.

[0062] Figure 5 It is a structural schematic diagram of the connection disc in the embodiment one.

[0063] Figure 6 Structure diagram of the encapsulation pipe head and the encapsulation groove in Example 1.

[0064] Figure 7 Structure diagram of the encapsulation disc in Example 1.

[0065] Figure 8 Method flow chart of the leak detection method in Example 2.

[0066] Figure 9 Method flow chart of the data information acquisition method in Example 2.

[0067] Figure 10 Method flow chart of the virtual model establishment method in Example 2.

[0068] Figure 11 Method flow chart of the data model acquisition method in the coordinate system in Example 2.

[0069] Figure 12 Functional module diagram of Example 3.

[0070] The figure marks: 1-encapsulation head; 2-heat exchange pipe assembly; 21-first pipe disc; 22-second pipe disc; 23-heat exchange pipe; 24-connection disc; 3-casing; 4-encapsulation disc; 41-encapsulation pipe head; 42-encapsulation groove. DETAILED DESCRIPTION

[0071] Currently, there are two methods for leak detection, i.e. water leak detection method and nitrogen leak detection method. The water leak detection method is to inject water into the heat exchanger, to pressurize the water in the heat exchanger to a certain pressure after the water is filled, and to detect the leak of the heat exchanger. After the leak detection is completed, the pressure is released and the water is drained, and then the leak is blocked. If the heat exchanger is large and the leakage is serious, the water pressure will leak at a lower pressure, and the water has to be drained and blocked. After the leak blocking is completed, the water is filled and the pressure is tested, and the process is repeated, increasing the heat exchanger maintenance time. Because the water filling and pressurizing need a lot of time, the leakage position needs to be dried before the fire welding and leakage elimination, otherwise the quality of the fire welding and leakage elimination will be affected. If there is a flammable medium in the heat exchanger, nitrogen replacement must be carried out before the fire welding and leakage elimination operation, otherwise fire and explosion will occur, endangering the safety of personnel and equipment. The nitrogen leak detection method is to use nitrogen to pressurize and leak test the tube type heat exchanger, and then to block the leak and perform the fire operation, without the need for replacement treatment, so the leakage elimination process is relatively fast, saving the maintenance and leakage elimination time. The comparison of the two leak detection methods shows that the nitrogen leak detection method saves a lot of maintenance time and maintenance cost.

[0072] Although the above characteristics are obtained by using nitrogen to leak test, both of them have the common problem that the leak elimination process is by plugging method, which is to plug the two ends of the leaking heat exchange tube, preventing the medium from flowing into the heat exchange tube, that is, the medium no longer enters the heat exchange tube and no longer participates in heat exchange, so the number of heat exchange tubes participating in work will be reduced. If a small number of heat exchange tubes are plugged in the heat exchanger, it has little effect on the working efficiency of the heat exchanger, but when the number of plugged heat exchange tubes is large, even more than half of the total number, only half of the heat exchange tubes are left to participate in heat exchange work, which directly leads to a significant reduction in the heat exchange effect of the heat exchanger, causing the related production process parameters before and after the device or section to be in an abnormal state, which has a huge negative impact on normal production, resulting in low production efficiency and high production cost. Ultimately, the only way out is to replace the new heat exchanger, which increases the maintenance cost or fixed asset cost.

[0073] Therefore, the existing technology has the problem that frequent plugging greatly reduces the working efficiency of the heat exchanger and increases the cost of the enterprise.

[0074] In view of the above technical problems, the present application makes the following design and concept: abandoning the method of plugging to eliminate leakage, fundamentally changing the structure of the tube-type heat exchanger in the prior art, allowing the heat exchange tube to be removed, and allowing the heat exchange tube to continue to exchange heat by repairing the leakage point. The method is also used to determine the specific position of the leakage point by modeling and searching for the heat exchange tube, providing an accurate position basis for repair welding, and the method is placed in a computer system, and each module in the system completes the process of finding the leakage point.

[0075] Based on the above design and concept, the following specific embodiments are combined with the accompanying drawings to further illustrate the present application. Figures 1-8 The present application will be further described in detail. Embodiment

[0076] A tube-type heat exchanger, as shown in Figure 1 , comprising:

[0077] A shell 3.

[0078] A heat exchange tube assembly 2 is arranged in the shell 3 and is sleeved with the shell 3, and is used to be pulled out from the shell 3 to the outside of the shell 3, and is repaired by plugging and inserting and clamping.

[0079] An encapsulation disc 4, as shown in Figure 2 , is fixed to the end of the shell and is detachably connected with the heat exchange tube assembly 2, the heat exchange tube assembly 2 penetrates into the encapsulation disc 4, and the encapsulation disc 4 is used to limit the position of the heat exchange tube assembly 2 in the shell 3.

[0080] A head 1 is arranged on the side of the encapsulation disc 4 away from the heat exchange tube assembly 2 and is detachably connected with the side wall of the encapsulation disc 4.

[0081] The packing disc 4 is connected with the heat exchange pipe assembly 2 by penetrating, and the heat exchange pipe assembly 2 is limited between the two end covers 1 and the shell 3 after being connected with the end covers 1, thereby forming a column tube heat exchanger which is internally detachable and externally firmly connected. In the working process, two media participating in heat exchange enter the shell 3 and the heat exchange pipe assembly 2 respectively, the direction of the media entering the shell 3 is the shell side direction, and the direction of the media entering the heat exchange pipe assembly 2 is the tube side direction, and heat exchange is performed in the space between the heat exchange pipe assembly 2 and the shell 3. In the leakage detection process, after being pressurized by nitrogen or water, the heat exchange pipe assembly 2 is pulled out of the packing disc 4, the heat exchange pipe assembly 2 is disassembled, and then the leakage point is repaired by welding to make the heat exchange pipe assembly 2 continue to participate in heat exchange, so that the working efficiency of the heat exchanger is maintained as the initial state, the problem of reducing the efficiency of the heat exchanger due to a large amount of plugging is directly avoided, and the enterprise cost is directly reduced.

[0082] Specifically, as shown in Figure 1 and Figure 5 , the heat exchange pipe assembly 2 in the embodiment includes:

[0083] The first pipe disc 21 is arranged on the side of the packing disc 4 away from the end cover 1 and is detachably connected with the packing disc 4.

[0084] The heat exchange pipe 23 is arranged on the first pipe disc 21, one end of the heat exchange pipe 23 penetrates the first pipe disc 21 and is inserted into the packing disc 4, and the pipe wall of the heat exchange pipe 23 is fixedly connected with the first pipe disc 21.

[0085] The second pipe disc 22 is arranged on the pipe wall of the heat exchange pipe 23 and is fixedly sleeved on the pipe wall of the heat exchange pipe 23, and is located at the other end of the heat exchange pipe 23. The other end of the heat exchange pipe 23 protrudes from the second pipe disc 22 and is fixedly connected with the pipe wall of the heat exchange pipe 23. The heat exchange pipe 23 is used for introducing the first medium from the first pipe disc 21 and flowing out from the second pipe disc 22, so that the first medium exchanges heat with the second medium flowing outside the heat exchange pipe 23.

[0086] The connecting disc 24 is sleeved on the side wall of the second pipe disc 22, the inner wall of the connecting disc 24 is detachably connected with the end surface of the second pipe disc 22, and the outer wall of the connecting disc 24 is detachably connected with the end cover.

[0087] In the leakage detection process, if it is determined that a certain heat exchange pipe 23 has a leakage point, the second pipe disc 22 in which the heat exchange pipe 23 is arranged is taken off from the connecting disc 24, the first pipe disc 21 is pushed, the first pipe disc 21 drives the heat exchange pipe 23 to move, the heat exchange pipe 23 drives the second pipe disc 22 to move and is exposed, so that not only the welding repair can be directly performed, but also the fire operation space for repairing the leakage point is provided.

[0088] Specifically, as shown in Figure 2 , Figure 3 and Figure 4As shown in the drawings, the number of the first tube discs 21 in the embodiment is multiple, each of the first tube discs 21 is sleeved together to form a concentric ring, and each of the first tube discs 21 is detachably connected to the packaging disc 4 through the heat exchange tube 23, and the packaging disc 4 is used to limit the relative position between adjacent first tube discs 21.

[0089] When working normally or carrying out nitrogen pressure test, the multiple first tube discs 21 in the concentric ring are fixed on the shell 3 through the packaging disc 4, so that the structure of the heat exchange tube assembly 2 is more stable, and normal heat exchange or nitrogen test is carried out. When repair welding is needed, the first tube disc 21 is timely detached from the packaging disc 4, so as to provide convenience for exposing the heat exchange tube 23.

[0090] Specifically, as shown in the drawings, Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the number of the second tube discs 22 in the embodiment is multiple, each of the second tube discs 22 is sleeved together to form a concentric ring, the inner wall of the connecting disc is inserted into the surface of each of the second tube discs 22 to limit the relative position between adjacent second tube discs 22, and the second tube disc 22 is used to drive the heat exchange tube 23 and the first tube disc 21 to move through the plug-in mode when repairing the leakage point.

[0091] When working normally or carrying out nitrogen pressure test, the relative position between each of the adjacent two second tube discs 22 in the concentric ring is fixed through the connecting disc 24, so that the heat exchange tube assembly 2 carries out normal heat exchange or nitrogen test. When repair welding is needed, the second tube disc 22 is timely detached from the connecting disc 24, the heat exchange tube 23 is gradually exposed by pushing the first tube disc 21, and convenience is provided for repairing the leakage point on the heat exchange tube 23.

[0092] Specifically, as shown in the drawings, Figure 2 , Figure 3 , Figure 6 and Figure 7 , the connecting disc 24 in the embodiment has the same internal structure as the packaging disc 4, and the packaging disc 4 is provided with:

[0093] a packaging groove 42 which is arranged on the inner wall of the packaging disc 4 and into which the end of the heat exchange tube 23 is inserted;

[0094] a packaging tube head 41 which is arranged in the packaging groove 42, inserted into the heat exchange tube 23 and tightly connected with the inner wall of the heat exchange tube 23, and used to seal the heat exchange tube 23 after being combined with the packaging groove 42.

[0095] In this way, the sealing pipe head 41 and the sealing groove 42 seal the inner and outer of the heat exchange pipe 23 respectively, so as to realize the purpose of sealing the heat exchange pipe 23, the first pipe disc 21 and the second pipe disc 22 of the sealing disc 4, and prevent the medium in the shell side from mixing with the medium in the tube side to lose the heat exchange effect.

[0096] Similarly, the connecting disc 24 seals and connects the heat exchange pipe 23 through the same structure as the sealing groove 42 and the sealing pipe head 41, and one end of the connecting disc 24 is sleeved on the second pipe disc 22, and the other end is detachably connected with the head 1, so as to fix the other end of the heat exchange pipe 23 on the shell, and realize the purpose of sealing and detaching the heat exchange pipe 23 for repair welding. Embodiment

[0097] The application further discloses a leak detection method of the column-tube heat exchanger, as shown in Figure 7 and Figure 8 , comprising the following steps.

[0098] S601 respectively acquire data information of the sealing disc 4 and the heat exchange pipe assembly 2.

[0099] S602 establishes a virtual model according to the data information.

[0100] S603 punches nitrogen or water into the sealing disc 4 to detect the leak.

[0101] S604 obtains the heat exchange pipe 23 on the first pipe disc 21 of the virtual model through the change of the pressure, and locks the position of the heat exchange pipe 23.

[0102] S605 extracts the heat exchange pipe 23 and the second pipe disc 22 where the heat exchange pipe 23 is located.

[0103] S606 finds the leak point of the heat exchange pipe 23.

[0104] S607 repairs the leak point.

[0105] Therefore, the process includes data collection, model establishment, leak detection, heat exchange pipe locking, heat exchange pipe extraction, leak point finding and leak point repair. The virtual model of the sealing disc 4 and the heat exchange pipe assembly 2 is established according to the acquired data information, the sealing disc 4 and the heat exchange pipe assembly 2 can be intuitively presented on the computer, and each heat exchange pipe 23 is marked and locked, so as to provide accurate position basis for detecting the heat exchange pipe 23 with the leak point through the pressure detection. Therefore, the specific position of the leak point can be accurately found, and targeted repair welding is carried out, so that the heat exchange pipe 23 returns to the heat exchange state, and the heat exchange efficiency of the column-tube heat exchanger is improved to the initial state when the column-tube heat exchanger is delivered.

[0106] Specifically, as shown in Figure 9As shown, in this embodiment, step S601 acquires data information from the encapsulation disk 4 and the heat exchanger tube assembly 2, including:

[0107] S701 obtains the data information of packaged disk 4 and gets the data of packaged disk 4.

[0108] Data information of heat exchanger tube assembly 2 in S702 is obtained.

[0109] This provides accurate data for obtaining the virtual models of the encapsulation disk 4 and the heat exchange tube assembly 2, respectively.

[0110] Specifically, such as Figure 10 As shown, in this embodiment, S602 establishes a virtual model based on data information, including:

[0111] S801 reads data from packaged disk 4 and heat exchanger tube assembly 2.

[0112] S802 obtains the position of the heat exchange tube 23 at the center of the packaged disk 4 as the center coordinate, divides the heat exchange tube 23 on the packaged disk 4, and establishes a coordinate system.

[0113] S803 places the data of the encapsulation disk 4 and the heat exchange tube 23 into the coordinate system to obtain the data model.

[0114] S804 associates the data model with the encapsulation disk 4 and the heat exchange tube 23 respectively, and marks the heat exchange tube 23 to obtain the virtual model.

[0115] By setting the heat exchange tube 23 at the center as the center coordinate, a virtual concentric circle coordinate system is established to simulate the physical packaging plate 4. The size of the packaging plate 4 and the number of heat exchange tubes 23 can be mapped to the virtual model. The position of each heat exchange tube 23 can be accurately determined through the data model, providing accurate data basis for subsequent leak detection and finding of the heat exchange tube 23 with leak points.

[0116] Specifically, such as Figure 11 As shown, in this embodiment, S803 places the data of the encapsulation disk 4 and the heat exchange tube 23 into the coordinate system to obtain the data model, including:

[0117] S901 associates the position of the geometric center of the package disk 4 with the coordinates of the dot in the coordinate system.

[0118] S902 will represent the correspondence between the position of each heat exchange tube 23 and the coordinates in the coordinate system.

[0119] S903 maps the heat exchange tube 23, located at the geometric center of the encapsulation disk 4, to the coordinates of the dot, thus obtaining the data model.

[0120] With this, the physical encapsulation disc 4 and each heat exchange tube 23 can be placed in the coordinate system, and the position of the heat exchange tube 23 can be reproduced through the associated data model, thereby providing an accurate basis for finding the leaking heat exchange tube 23 and quickly finding the specific position of the leaking heat exchange tube 23.

[0121] Specifically, as shown in Figure 12 the storage system of the tube bundle heat exchanger leak detection method in the embodiment, the storage system is built in a computer and includes:

[0122] The acquisition module is configured to acquire image information of the encapsulation disc 4 and the heat exchange tube assembly 2.

[0123] The processing module is in data connection with the acquisition module and is configured to convert the image information into data information.

[0124] The modeling module is in data connection with the processing module and is configured to establish a virtual model according to the data information.

[0125] The analysis module is in data connection with the modeling module and the acquisition module, respectively, and is configured to lock the position of the leaking heat exchange tube 23 according to the association and correspondence between the leaking heat exchange tube 23 in the image information and the virtual model.

[0126] The image information acquired by the acquisition module is transmitted to the processing module, the image information is converted into data information by the processing module and then transmitted to the modeling module, and the virtual model is established by the modeling module. In the pressure test and leak detection process, the analysis module locks the position of the heat exchange tube 23 with a leak in real time, thereby forming a complete leak detection process and providing an accurate position basis for subsequent repair welding.

[0127] Please refer to Figures 1-12 for a detailed description of the leak detection process of the present application by taking nitrogen leak detection as an example.

[0128] Acquisition and modeling process

[0129] In application examples two and three, the tube bundle heat exchanger is isolated from the work section, nitrogen gas is filled into the interior of the tube bundle heat exchanger through the head 1, and replacement is performed. In the replacement process, the acquisition module acquires image information of the encapsulation disc 4 and the heat exchange tube assembly 2, respectively, and transmits the image information to the processing module. The processing module converts the image information into data information and then transmits the data information to the modeling module. The modeling module establishes a virtual model and then corresponds the encapsulation disc 4 and the heat exchange tube assembly 2 to the virtual model.

[0130] Pressure test and leak detection process:

[0131] Continuing to fill nitrogen from the head 1 to the tube heat exchanger, the pressure in the tube heat exchanger reaches the normal working pressure range, stop filling nitrogen, observe the pressure in the set time period, when the pressure continuously decreases, the specific position of the heat exchange tube 23 is analyzed by the analysis module in the virtual model, the position of the heat exchange tube 23 on the packaging disc 4 is found out through the position of the heat exchange tube 23 in the coordinate system, and the heat exchange tube 23 is locked.

[0132] Please combine example one, example two and example three, remove the end head 1, one end of the connecting disc 24 and the second tube disc 22 are disassembled, and the other end of the packaging disc 4 and the first tube disc 21 are disassembled, the first tube disc 21 and the second tube disc 22 are exposed. The tool is used to take out the second tube disc 22 where the heat exchange tube 23 with the leak point from the connecting disc 24, specifically, the first tube disc 21 is pushed to the second tube disc 22 direction to push out the heat exchange tube 23, then the specific position of the leak point on the heat exchange tube 23 with the leak point is found out by conventional means, and the repair welding is carried out.

[0133] The application breaks the conventional plugging method, and the leak elimination process is carried out by collecting, modeling, locking the leak point heat exchange tube 23, finding the leak point and repair welding, so that the medium that should flow into the heat exchange tube continues to enter the heat exchange tube, so that the heat exchange tube 23 can continue to recover to the working state and continue to participate in the heat exchange work, and the number of heat exchange tubes 23 participating in the heat exchange work remains unchanged, not only restores the production to normal state, but also greatly reduces the maintenance cost or fixed asset cost, and saves huge production cost for enterprises all the year round.

[0134] The specific embodiment is only an explanation of the application, which is not a limitation of the application, and those skilled in the art can make non-creative contribution modifications to the embodiment according to the needs after reading the specification, but as long as it is within the protection scope of the application, it is protected by the patent law.

Claims

1. A shell-and-tube heat exchanger, characterized by It includes: The shell (3); Heat exchange tube assembly (2), the heat exchange tube assembly (2) includes: the first tube disc (21) is arranged on the side of the packing disc (4) away from the head (1) in a concentric ring, and is detachably connected with the packing disc (4);Heat exchange tube (23) is arranged on the first tube disc (21), one end of which penetrates the first tube disc (21) and is inserted into the packing disc (4), and the tube wall is fixedly connected with the first tube disc (21);The second tube disc (22) is arranged in a concentric ring and is fixedly sleeved on the tube wall of the heat exchange tube (23) at the other end of the heat exchange tube (23), and the other end of the heat exchange tube (23) protrudes from the second tube disc (22), the heat exchange tube (23) is used for introducing the first medium from the first tube disc (21) and flowing out from the second tube disc (22), so that the first medium exchanges heat with the second medium flowing outside the heat exchange tube (23);The connecting disc (24) is sleeved on the side wall of the second tube disc (22), the inner wall is detachably connected with the end face of the second tube disc (22), and the outer wall is detachably connected with the head (1);The heat exchange tube assembly (2) is arranged in the shell (3), and is sleeved with the shell (3), used for being pulled out from the shell (3) to the outside of the shell (3), and the leakage point is repaired by pulling and inserting, clamping; The connecting disc (24) and the internal structure of the packing disc (4) are the same, the packing disc (4) is provided with: a packing groove (42) is formed in the inner wall of the packing disc (4), the end of the heat exchange tube (23) is inserted into the packing groove (42), and the outer wall of the heat exchange tube (23) is tightly connected with the packing groove (42);The packing tube head (41) is arranged in the packing groove (42) and is inserted into the heat exchange tube (23) and tightly connected with the inner wall of the heat exchange tube (23), which is used for sealing the heat exchange tube (23) after being combined with the packing groove (42);The packing disc (4) is fixed to the end of the shell (3) and is detachably connected with the heat exchange tube assembly (2), the heat exchange tube assembly (2) penetrates into the packing disc (4), and the packing disc (4) is used to limit the position of the heat exchange tube assembly (2) in the shell (3); The head (1) is arranged on the side of the packing disc (4) away from the heat exchange tube assembly (2) and is detachably connected with the packing disc (4).

2. The shell-and-tube heat exchanger according to claim 1, characterized in that The number of the first tube disc (21) is multiple, each of the first tube disc (21) is sleeved together inside and outside, which constitutes a concentric ring, and each of the first tube disc (21) is detachably connected with the packing disc (4) through the heat exchange tube (23), and the packing disc (4) is used to limit the relative position between adjacent first tube discs (21).

3. The shell-and-tube heat exchanger according to claim 2, characterized in that The second tube disc (22) is a plurality of numbers, each of the second tube disc (22) is sleeved together in a concentric ring, the inner wall of the connecting disc (24) is inserted on the surface of each second tube disc (22), so as to limit the relative position between adjacent second tube discs (22), when the leakage point is repaired, the second tube disc (22) is used to drive the heat exchange tube (23) and the first tube disc (21) to move by plugging.

4. The method for detecting leaks in a heat exchanger according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: S601 respectively acquiring data information of the packaging disc (4) and the heat exchange tube assembly (2); S602, according to the data information, establishing a virtual model, comprising: S801 reading the data of the packaging disc (4) and the data of the heat exchange tube (23); S802 obtaining the position of the heat exchange tube (23) at the center of the packaging disc (4) as the center coordinate, dividing the heat exchange tube (23) on the packaging disc (4), and establishing a coordinate system; S803 placing the data of the packaging disc (4) and the data of the heat exchange tube (23) into the coordinate system respectively to obtain a data model; S804 associating the data model with the packaging disc (4) and the heat exchange tube (23) respectively to mark the heat exchange tube (23) and obtain a virtual model; S603 injecting nitrogen or water into the packaging disc (4) to carry out pressure test; S604, by the pressure change, obtaining the heat exchange tube (23) leaking on the first tube disc (21) on the virtual model, and locking the position of the heat exchange tube (23); S605 extracting the second tube disc (22) where the heat exchange tube (23) is located; S606 finding the leakage point of the heat exchange tube (23); S607 repairing the leakage point.

5. The method of claim 4, wherein the step of detecting the leak is performed by detecting a change in the temperature of the fluid in the tube side of the heat exchanger. The S601 respectively acquiring data information of the packaging disc (4) and the heat exchange tube assembly (2) comprises: S701 acquiring data information of the packaging disc (4) to obtain packaging disc (4) data; S702, the data information of the heat exchange tube assembly (2) obtains heat exchange tube assembly (2) data.

6. The method of claim 4, wherein The S803 respectively placing the data of the packaging disc (4) and the data of the heat exchange tube (23) into the coordinate system to obtain a data model, comprising: S901 associating the position of the geometric center of the packaging disc (4) with the circular point coordinate of the coordinate system; S902 associating the position of each heat exchange tube (23) with the coordinate in the coordinate system; S903 corresponding the heat exchange tube (23) located at the geometric center of the packaging disc (4) with the circular point coordinate to obtain a data model.

7. The storage system of a leak hunting method of a tubular heat exchanger according to any one of claims 4 to 6, characterized in that, It comprises: The acquisition module is used for acquiring image information of the packaging disc (4) and the heat exchange tube assembly (2); The processing module is connected with the acquisition module, and is used for converting the image information into data information; The modeling module is connected with the processing module, and is used for establishing a virtual model according to the data information; An analysis module is connected with the modeling module and the acquisition module respectively, and is used for locking the position of the heat exchange pipe (23) of the leakage point according to the association and correspondence between the heat exchange pipe (23) of the leakage point in the image information and the heat exchange pipe (23) of the leakage point in the virtual model.

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