Energy-saving shell-and-tube heat exchanger and method of use thereof

Abstract

An energy-saving shell-and-tube heat exchanger and its usage method are disclosed. This relates to the field of heat exchangers. The heat exchanger includes a shell and two tube sheets disposed within the shell. A plurality of heat exchange tubes are inserted between the two tube sheets. The shell has a first inlet pipe and a first outlet pipe for shell-side fluid flow, and a second inlet pipe and a second outlet pipe for tube-side fluid flow. A third inlet pipe is located on one side of the bottom of the shell, and a third outlet pipe is located on the other side. A housing is located on the outer side of the shell. The housing contains cleaning fluid and cleaning blocks. A first pump is mounted on the third inlet pipe, which pumps the cleaning fluid and cleaning blocks to flow back and forth between the third inlet pipe, the heat exchange tubes, the third outlet pipe, and the housing. The surface of the cleaning blocks has several edges and several grooves. The maximum outer diameter of the cleaning blocks is smaller than the inner diameter of the heat exchange tubes, the third inlet pipe, and the third outlet pipe. This application features rapid and convenient cleaning of the heat exchanger.

Description

Technical Field

[0001] This application relates to the field of heat exchangers, specifically to an energy-saving shell-and-tube heat exchanger, and also to a method of using the energy-saving shell-and-tube heat exchanger. Background Technology

[0002] Shell-and-tube heat exchangers, also known as tubular heat exchangers, are a type of indirect heat exchange equipment widely used in industries such as chemical, petroleum, pharmaceutical, and food processing.

[0003] Chinese patent document CN222718748U discloses a shell-and-tube heat exchanger that is easy to clean, specifically disclosing a shell, hydraulic cylinders, push rods, and a locking mechanism. A front cover is detachably mounted on one end of the shell, and a rear cover is detachably mounted on the other end. A tube bundle mechanism is installed on the inner wall of the front cover. Multiple sets of hydraulic cylinders are arranged in a circular array on the outer wall of the shell, with the telescopic ends of the hydraulic cylinders fixedly connected to the outer wall of the front cover. The hydraulic cylinders are used to move the front cover along the horizontal axis of the shell. Multiple push rods are arranged parallel to the hydraulic cylinders, with one end of each push rod fixedly connected to the outer wall of the front cover. Multiple locking mechanisms are fixedly mounted on the outer wall of the rear cover, with each locking mechanism corresponding to one of the push rods. This patent improves the ease of cleaning the interior of the shell-and-tube heat exchanger.

[0004] However, the aforementioned patent still requires disassembling the housing for cleaning, which is complicated. Moreover, once the tube bundle assembly is removed from the housing, only the outer surface of the tube bundle assembly can be cleaned relatively easily, while the inner wall of the tube bundle assembly cannot be cleaned quickly, resulting in low overall cleaning efficiency. Summary of the Invention

[0005] In order to overcome the problems of complex operation and low cleaning efficiency of heat exchanger cleaning in the prior art, this application provides an energy-saving shell and tube heat exchanger and its usage method.

[0006] In a first aspect, this application provides an energy-saving shell-and-tube heat exchanger, which is implemented by the following technical solution: An energy-saving shell-and-tube heat exchanger includes a shell and two tube sheets disposed inside the shell, with a plurality of heat exchange tubes passing through the two tube sheets. The shell is provided with a first inlet pipe and a first outlet pipe for shell-side fluid flow, and a second inlet pipe and a second outlet pipe for tube-side fluid flow. A third inlet pipe is provided on one side of the bottom of the shell, and a third outlet pipe is provided on the other side. A housing is provided on the outer side of the shell.

[0007] The box contains cleaning fluid and cleaning blocks. A first pump is installed on the third input pipe. The first pump is used to transport the cleaning fluid and cleaning blocks to flow back and forth in the third input pipe, heat exchange pipe, third discharge pipe and box.

[0008] The surface of the cleaning block has several edges and corners, and the surface of the cleaning block is also provided with several grooves. The maximum outer diameter of the cleaning block is smaller than the inner diameter of the heat exchange tube, the third inlet tube and the third outlet tube.

[0009] By adopting the above technical solution, heat exchange between shell-side fluid and tube-side fluid can be achieved. Under the pumping action of the first pump body, cleaning liquid and cleaning blocks are transported through the third input pipe, the third discharge pipe and the box body, so that the cleaning liquid and cleaning blocks flow back and forth in the third input pipe, heat exchange tube, third discharge pipe and the box body. In this way, the cleaning blocks with edges and grooves and appropriate outer diameter can effectively scrape and clean the inner wall of the heat exchange tube.

[0010] Optionally, the shell includes a tube box and end caps. The tube box is tubular, and a tube sheet is provided on the inner side of each end of the tube box. Each end face of the tube box is connected to an end cap. A sealed cavity is formed between the tube sheet and the end caps, and the cavity is in communication with the heat exchange tube.

[0011] The first input pipe and the first discharge pipe are both connected to the pipe box, and the second input pipe, the second discharge pipe, the third input pipe and the third discharge pipe are all connected to the cavity.

[0012] By adopting the above technical solution, the shell is designed as a tube box and end cap structure, which facilitates the welding of the tube sheet and heat exchange tubes. A closed cavity is formed between the tube sheet and the end cap and is connected to the heat exchange tubes, ensuring that the tube-side fluid can first enter the cavity and then uniformly enter all the heat exchange tubes. Similarly, during the cleaning step, the cleaning liquid carrying the cleaning block can also uniformly enter all the heat exchange tubes, thereby achieving the cleaning of the inner wall of the heat exchange tubes.

[0013] The shell-side fluid can enter the tube box through the first inlet pipe, and the tube-side fluid can enter the cavity through the second inlet pipe and then flow into the heat exchange tube, realizing the flow heat exchange of the shell-side and tube-side fluids; at the same time, the third inlet pipe and the third outlet pipe are connected to the cavity, which facilitates the entry of cleaning liquid and cleaning block into the heat exchange tube for cleaning.

[0014] Optionally, the tube sheet is bowl-shaped, and the protrusion direction of the tube sheet is opposite to the protrusion direction of the adjacent end cap.

[0015] By adopting the above technical solution, the cavity is nearly spherical with fewer dead angles, which avoids the cleaning block getting stuck in the cavity and thus prevents the cleaning block from mixing into the fluid in the tube.

[0016] Optionally, each cavity is provided with a piston plate, and each end cap is provided with a threaded sleeve. A lead screw is screwed into the threaded sleeve. One end of the lead screw is located inside the cavity and connected to the piston plate, and the other end of the lead screw is located outside the housing and is provided with a handwheel.

[0017] The second input pipe and the third input pipe, as well as the second discharge pipe and the third discharge pipe, are all staggered in the horizontal direction. The connection between the third input pipe and the pipe box is close to one of the pipe plates, and the connection between the third discharge pipe and the pipe box is close to another of the pipe plates.

[0018] By adopting the above technical solution, the piston plate can be moved in the cavity by using the lead screw and handwheel. On the one hand, the cavity volume can be changed to adapt to different working conditions. On the other hand, it can cut off the second input pipe and the second discharge pipe, ensuring that the cleaning fluid and cleaning block will not enter the second input pipe or the second discharge pipe.

[0019] Optionally, the box body is provided with a partition, which divides the internal space of the box body into an upper chamber and a lower chamber. The middle part of the partition is recessed downward, and a conduit is provided in the middle part of the partition, with a valve body provided on the conduit.

[0020] The outer wall of the housing is provided with a branch pipe and a water inlet pipe. One end of the branch pipe is connected to the upper chamber and the other end is connected to the third input pipe. The connection between the branch pipe and the third input pipe is located downstream of the first pump body. A second pump body is provided on the branch pipe.

[0021] The third input pipe is connected to the lower chamber, the third output pipe is connected to the upper chamber, the branch pipe and the third output pipe are located on both sides of the upper chamber, and the water inlet pipe is used to deliver cleaning fluid into the upper chamber.

[0022] By adopting the above technical solution, the central recess of the partition plate and the guide tube, together with the valve body, control the direction of the cleaning fluid flow. The branch pipe and the second pump body can achieve cleaning fluid delivery through different paths. The water inlet pipe can replenish the cleaning fluid in the upper chamber in time. At the same time, when the first pump body and the valve are closed, only the cleaning fluid will flow in the heat exchange tube, which improves the cleaning effect and ensures that no cleaning block remains in the shell.

[0023] Optionally, both the housing and the box are provided with air inlet pipes, which are used to deliver gas to the cavity and the upper chamber.

[0024] By adopting the above technical solution, the air inlet pipe on the shell inflates the space between the end cap and the piston plate, which can prevent the cleaning fluid or tube fluid from penetrating into the space between the end cap and the piston plate. The air inlet pipe on the box is used to blow gas into the lower chamber. When the gas adheres to the groove of the cleaning block, it can lift the cleaning block and improve the scraping effect of the cleaning block on the inner wall of the heat exchange tube.

[0025] Optionally, the piston plate is made of rubber material, and the outer wall of the piston plate is fitted with the inner wall of the housing.

[0026] By adopting the above technical solution, the piston plate is made of rubber and its outer wall fits the inner wall of the shell, ensuring the sealing performance when the piston plate moves, avoiding leakage of tube fluid or cleaning fluid, and improving the stability and reliability of the heat exchanger operation.

[0027] Optionally, a support platform is provided below the housing, the support platform including a base plate and a support plate, the support plate being connected to the housing via a support seat, and the box being located on top of the support plate;

[0028] One side of the base plate and one side of the support plate are hinged to each other. Adjustment plates are provided on the other side of the base plate and the other side of the support plate. A hydraulic cylinder is provided between the two adjustment plates. The hydraulic cylinder is used to drive the support plate to rotate around the hinge.

[0029] By adopting the above technical solution, the support platform can play a stable supporting role. The angle of the heat exchanger can be adjusted by using the hydraulic cylinder to drive the support plate to rotate around the hinge, thereby ensuring that the cleaning block can flow back into the box.

[0030] Optionally, the first input pipe, the first discharge pipe, the second input pipe, the second discharge pipe, the third input pipe, and the third discharge pipe are all provided with flexible connectors near the housing.

[0031] By adopting the above technical solution, during the process of adjusting the shell to a tilted state, the first input pipe, the first discharge pipe, the second input pipe, the second discharge pipe, the third input pipe, and the third discharge pipe have an adaptive adjustment margin to avoid breakage.

[0032] Secondly, this application provides a method for using an energy-saving shell-and-tube heat exchanger, implemented using the following technical solution: A method for using an energy-saving shell-and-tube heat exchanger, applied to the energy-saving shell-and-tube heat exchanger described in claim 5, includes a heat exchange step:

[0033] Turn the handwheel to bring the piston plate close to the head, shut off the first pump body and the second pump body, input the shell-side fluid into the shell through the first input pipe and discharge it through the first discharge pipe, and input the tube-side fluid into the heat exchange tube through the second input pipe and discharge it through the second discharge pipe.

[0034] Cleaning steps:

[0035] S1. Stop the input of tube-side fluid and shell-side fluid and close the first input pipe, the first discharge pipe, the second input pipe and the second discharge pipe;

[0036] S2. Turn the handwheel to bring the piston plate close to the tube sheet, open the first pump body and valve body, and let the cleaning fluid and cleaning block flow in the heat exchange tube.

[0037] S3. After running for 50-60 minutes in step S2, close the first pump body and valve body and open the second pump body to allow the cleaning fluid to flow in the heat exchange tube.

[0038] S4. After running for 20-30 minutes in step S3, turn off the second pump body, turn the handwheel to reset the piston plate, and you are done.

[0039] By adopting the above technical solution, the heat exchange step and the cleaning step can be reliably switched, and the inner wall of the heat exchange tube can be reliably cleaned during the cleaning step.

[0040] Compared with the prior art, this application has the following advantages:

[0041] 1. Heat transfer between the tube-side fluid and the shell-side fluid is achieved through the first inlet pipe, the first outlet pipe, the second inlet pipe, and the second outlet pipe, meeting the heat exchange requirements under different operating conditions.

[0042] 2. The cleaning fluid and the cleaning blocks with sharp edges are conveyed by the first pump body and flow back and forth in the heat exchange tube, which can effectively clean the dirt in the heat exchange tube without disassembling the shell, thus maximizing the cleaning efficiency. Attached Figure Description

[0043] Figure 1 This is an illustrative three-dimensional representation of the present application. Figure 1 ;

[0044] Figure 2 This is an illustrative three-dimensional representation of the present application. Figure 2 ;

[0045] Figure 3 This is a sectional view of the internal structure of the shell and enclosure;

[0046] Figure 4 This is a reference diagram showing the assembly state of the heat exchanger tubes and tube sheet;

[0047] Figure 5 This is a reference diagram showing the assembly state of the diaphragm and conduit;

[0048] Figure 6 This is a schematic 3D diagram of the cleaning block;

[0049] In the diagram: 1. Shell; 11. First input pipe; 12. First discharge pipe; 13. Second input pipe; 14. Second discharge pipe; 15. Third input pipe; 151. First pump body; 152. Flexible joint; 16. Third discharge pipe; 17. Tube box; 18. End cap; 181. Threaded sleeve; 182. Lead screw; 183. Handwheel; 19. Cavity; 2. Tube sheet; 3. Heat exchange tube; 4. Box body; 41. Partition plate; 42. Upper chamber; 43. Lower chamber; 44. Conduit; 440. Valve body; 45. Branch pipe; 450. Second pump body; 46. Water inlet pipe; 47. Air inlet pipe; 48. Overflow pipe; 5. Cleaning block; 51. Edge; 52. Groove; 6. Piston plate; 7. Support platform; 71. Base plate; 72. Support plate; 721. Support seat; 722. Adjusting plate; 73. Hydraulic cylinder. Detailed Implementation

[0050] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0051] like Figure 1-6 As shown, an energy-saving shell-and-tube heat exchanger includes a support platform 7, a shell 1, a tube sheet 2, and heat exchange tubes 3. The support platform 7 is located below the shell 1 and includes a base plate 71 and a support plate 72. The base plate 71 is placed on the ground, and one side of the base plate 71 and one side of the support plate 72 are hinged together. Adjustable plates 722 are provided on the other side of both the base plate 71 and the support plate 72. A hydraulic cylinder 73 is provided between the two adjusting plates 722, and the hydraulic cylinder 73 is used to drive the support plate 72 to rotate around the hinge. The support plate 72 is connected to the shell 1 via a support base 721, and a housing 4 is located on top of the support plate 72. When the support plate 72 and the base plate 71 are in contact, the push rod of the hydraulic cylinder 73 is in the retracted state and the housing 1 is in a horizontal state. When the push rod of the hydraulic cylinder 73 extends, the distance between the two adjusting plates 722 increases, and the support plate 72 will be lifted. That is, under the action of the hydraulic cylinder 73, the support plate 72 can rotate around the hinge. In this way, the posture of the housing 1 can be adjusted, that is, the housing 1 can be changed from a horizontal position to an inclined position.

[0052] The shell 1 includes a tube box 17 and end caps 18. The tube box 17 is tubular, with a tube sheet 2 on the inner side of each end. Both end faces of the tube box 17 are connected to an end cap 18. Specifically, the tube box 17 and the end caps 18 can be connected via flanges. A sealed cavity 19 is formed between the tube sheet 2 and the end caps 18, and the cavity 19 communicates with heat exchange tubes 3. Several heat exchange tubes 3 are inserted between the two tube sheets 2. A first inlet pipe 11 is provided on one side of the upper part of the shell 1, a first outlet pipe 12 is provided on the other side of the lower part of the shell 1, a second inlet pipe 13 is provided on the other side of the upper part of the shell 1, and a second outlet pipe 14 is provided on one side of the upper part of the shell 1. The outer wall of the tube sheet 2 is fitted against the inner wall of the tube box 17, thus creating a sealed environment between the two tube sheets 2. Both the first inlet pipe 11 and the first outlet pipe 12 communicate with the tube box 17, and the connection point is located between a pair of tube sheets 2. The first inlet pipe 11 can introduce shell-side fluid into the tube box 17. After entering the tube box 17, the shell-side fluid will contact the outer wall of the heat exchange tubes 3, and then move along the axial direction of the tube box 17, and finally be discharged from the first outlet pipe 12. The second inlet pipe 13 is connected to one cavity 19, and the second outlet pipe 14 is connected to another cavity 19. In this way, after the tube-side fluid is introduced into one cavity 19 through the second inlet pipe 13, it can be evenly distributed into all the heat exchange tubes 3. When the tube-side fluid flows in the heat exchange tubes 3, the heat of the tube-side fluid can be transferred to the shell-side fluid, thereby realizing the heat exchange operation. When the tube-side fluid flows into another cavity 19, it can be discharged outward from the second outlet pipe 14. In this way, through the continuous input and output of tube-side and shell-side fluids, the heat exchange function can be reliably realized.

[0053] Each cavity 19 contains a piston plate 6, and each end cap 18 contains a threaded sleeve 181. A lead screw 182 is screwed into the threaded sleeve 181. One end of the lead screw 182 is located inside the cavity 19 and connected to the piston plate 6, while the other end is located outside the housing 1 and has a handwheel 183. By rotating the handwheel 183, the depth to which the lead screw 182 is screwed into the housing 1 can be changed, thus driving the piston plate 6. When the lead screw 182 is connected to the piston plate 6, the rotation of the lead screw 182 can drive the piston plate 6 to rotate and move along the axial direction of the lead screw 182. When the lead screw 182 and the piston plate 6 are connected by a bearing, the rotation of the lead screw 182 can cause the piston plate 6 to translate along the axial direction of the lead screw 182. The movement of the piston plate 6 can adjust the size of the cavity 19 to adapt to different working conditions. A third inlet pipe 15 is provided on one side of the bottom of the housing 1, and a third outlet pipe 16 is provided on the other side. A box 4 is provided on the outside of the housing 1. The box 4 contains cleaning fluid and cleaning blocks 5. A first pump body 151 is provided on the third inlet pipe 15. The first pump body 151 is used to transport the cleaning fluid and cleaning blocks 5 to flow back and forth in the third inlet pipe 15, heat exchange pipe 3, third outlet pipe 16 and box 4. The surface of the cleaning blocks 5 has several edges 51 and several grooves 52. The maximum outer diameter of the cleaning blocks 5 is smaller than the inner diameter of the heat exchange pipe 3, the third inlet pipe 15 and the third outlet pipe 16. A partition 41 is provided inside the box 4, which divides the internal space of the box 4 into an upper chamber 42 and a lower chamber 43. The middle part of the partition 41 is recessed downward, and a conduit 44 is provided in the middle part of the partition 41. A valve body 440 is provided on the conduit 44. The outer wall of the housing 4 is provided with a branch pipe 45 and a water inlet pipe 46. One end of the branch pipe 45 is connected to the upper chamber 42, and the other end is connected to the third input pipe 15. The connection between the branch pipe 45 and the third input pipe 15 is located downstream of the first pump body 151. A second pump body 450 is provided on the branch pipe 45. The third input pipe 15 is connected to the lower chamber 43, and the third output pipe is connected to the upper chamber 42. The branch pipe 45 and the third output pipe are located on both sides of the upper chamber 42. The water inlet pipe 46 is used to deliver cleaning fluid into the upper chamber 42.

[0054] When the heat exchanger is in heat exchange mode, one end of the second inlet pipe 13 and the heat exchange tube 3 are located on the same side of a piston plate 6, and the other end of the second outlet pipe 14 and the heat exchange tube 3 are located on the same side of another piston plate 6. That is, at this time, the second inlet pipe 13 is connected to one cavity 19, and the second outlet pipe 14 is connected to another cavity 19, while the first pump body 151 and the second pump body 450 are both in the closed state. In this way, the tube-side fluid will not enter the third inlet pipe 15, the third outlet pipe 16, or the housing 4. Specifically, check valves can be installed at the liquid outlet end of the first pump body 151, the liquid outlet end of the second pump body 450, and the third outlet pipe 16 to prevent the tube-side fluid from flowing back into the housing 4.

[0055] When the heat exchanger needs cleaning, stop the input of fluid to both the tube side and the shell side. Then, turn handwheel 183 to adjust the position of piston plate 6. Since the second input pipe 13 and the third input pipe 15, and the second discharge pipe 14 and the third discharge pipe 16 are all staggered in the horizontal direction, the connection between the third input pipe 15 and the tube box 17 is close to one tube plate 2, and the connection between the third discharge pipe 16 and the tube box 17 is close to another tube plate 2. This results in one end of the second input pipe 13 and the heat exchange tube 3 being located on both sides of one piston plate 6, and the other end of the second discharge pipe 14 and the heat exchange tube 3 being located on both sides of another piston plate 6. In other words, at this time, the second input pipe 13 is isolated from one cavity 19, and the second discharge pipe 14 is isolated from another cavity 19.

[0056] After the piston plate 6 is adjusted, the first pump body 151 is opened, the valve body 440 is opened, and the second pump body 450 remains closed. At this time, the first pump body 151 can pump the cleaning fluid and cleaning block 5 in the lower chamber 43 into a chamber 19. The cleaning fluid carrying the cleaning block 5 enters the heat exchange tube 3 after entering the chamber 19, and then flows to the upper chamber 42 through another chamber 19 and the third discharge pipe 16, and finally flows back to the lower chamber 43 through the conduit 44. When the cleaning fluid and cleaning block 5 flow in the heat exchange tube 3, the cleaning fluid can flush the inner wall of the heat exchange tube 3, which can initially clean the dirt adhering to the inner wall of the heat exchange tube 3. The cleaning block will rotate irregularly during the movement. At the same time, there are sharp edges 51 on the surface of the cleaning block. In this way, the cleaning block will frequently hit the inner wall of the heat exchange tube 3, thereby scraping away the dirt and improving the cleaning effect. Furthermore, both the housing 1 and the box 4 are provided with air inlet pipes 47. When the air inlet pipe 47 on the box 4 delivers gas into the lower chamber 43, the gas will fill the cleaning liquid. Since there are several grooves 52 on the surface of the cleaning block 5, some gas will flow into the grooves 52. In this way, the flipping effect of the cleaning block 5 can be improved, thereby maximizing the cleaning efficiency, and there is no need to disassemble the housing 1.

[0057] An overflow pipe 48 is also provided on the outer wall of the housing 4. The overflow pipe 48 is located at the upper part of the lower chamber 43. After cleaning for a period of time, cleaning fluid can be injected into the upper chamber 42 through the water inlet pipe 46. When the cleaning fluid is excessive, it can be automatically discharged out through the overflow pipe 48, which can dilute the dirt in the cleaning fluid. After the cleaning fluid and cleaning blocks 5 have been circulated multiple times, the first pump body 151 is turned off, the second pump body 450 is turned on, and the cleaning fluid is delivered into the upper chamber 42 through the water inlet pipe 46. At this time, after the cleaning fluid flows back into the upper chamber 42, part of it will re-enter the heat exchange tube 3 through the branch pipe 45, and another part will flow into the lower chamber 43 through the conduit 44 and be discharged through the overflow pipe 48. At the same time, the cleaning blocks 5 with higher density will accumulate in the lower chamber 43. When there is little dirt in the cleaning fluid, the inlet pipe 46 stops supplying the cleaning fluid and the valve body 440 is closed. At this time, the flow of the cleaning fluid in the cavity 19 and the heat exchange tube 3 can carry all the cleaning blocks 5 in the heat exchanger into the upper chamber 42. Since the middle part of the partition 41 is concave downward, the cleaning blocks 5 will gather in the middle part of the partition 41 and the guide tube 44, ensuring that no cleaning blocks 5 are left in the heat exchange tube 3. In the final stage of cleaning the heat exchange tube 3, the push rod of the hydraulic cylinder 73 extends, allowing the support plate 72 to rotate around the hinge, thereby changing the support platform 7 from a horizontal state to an inclined state, which also makes the shell 1 tilted. Specifically, the height of the third inlet pipe 15 will be higher than the height of the third outlet pipe 16, thus improving the return effect of the cleaning fluid and the cleaning blocks 5. The first input pipe 11, the first discharge pipe 12, the second input pipe 13, the second discharge pipe 14, the third input pipe 15, and the third discharge pipe 16 are all equipped with flexible joints 152 near the housing 1. This ensures that the first input pipe 11, the first discharge pipe 12, the second input pipe 13, the second discharge pipe 14, the third input pipe 15, and the third discharge pipe 16 can adaptively deflect during the gradual tilting of the housing 1, thus avoiding breakage.

[0058] Furthermore, the tube sheet 2 is bowl-shaped, and the protruding direction of the tube sheet 2 is opposite to that of the protruding direction of the adjacent end cap 18. That is to say, the cavity 19 formed between the corresponding end cap 18 and the tube sheet 2 can be nearly spherical, thereby preventing the cleaning block 5 from getting stuck in the cavity 19. The piston plate 6 is made of rubber material, and the outer wall of the piston plate 6 fits against the inner wall of the housing 1, thus ensuring that the cleaning fluid or tubing fluid will not leak to the other side of the piston plate 6. Furthermore, when the air inlet pipe 47 on the housing 1 supplies air into the cavity 19, the pressure in the part of the cavity 19 between the end cap 18 and the piston plate 6 will increase, thereby improving the anti-leakage effect.

[0059] This embodiment also discloses a method for using an energy-saving shell-and-tube heat exchanger.

[0060] A method for using an energy-saving shell-and-tube heat exchanger, applicable to an energy-saving shell-and-tube heat exchanger, includes the following heat exchange steps:

[0061] Turn the handwheel 183 so that the piston plate 6 is close to the end cap 18, close the first pump body 151 and the second pump body 450, input the shell-side fluid into the shell 1 through the first input pipe 11 and discharge it through the first discharge pipe 12, and input the tube-side fluid into the heat exchange tube 3 through the second input pipe 13 and discharge it through the second discharge pipe 14.

[0062] Cleaning steps:

[0063] S1. Stop the input of tube-side fluid and shell-side fluid and close the first input pipe 11, the first discharge pipe 12, the second input pipe 13 and the second discharge pipe 14;

[0064] S2. Turn the handwheel 183 to bring the piston plate 6 close to the tube plate 2, and open the first pump body 151 and valve body 440 to allow the cleaning fluid and cleaning block 5 to flow in the heat exchange tube 3.

[0065] S3. After running for 50-60 minutes in step S2, close the first pump body 151 and valve body 440 and open the second pump body 450 to allow the cleaning fluid to flow in the heat exchange tube 3.

[0066] S4. After running for 20-30 minutes in step S3, turn off the second pump body 450, turn the handwheel 183 to reset the piston plate 6, and you are done.

[0067] This application enables reliable cleaning of the inner wall of the heat exchange tube 3 without disassembling the housing 1, and maximizes cleaning efficiency.

[0068] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. An energy-saving shell-and-tube heat exchanger, comprising a shell (1) and two tube sheets (2) disposed within the shell (1), wherein a plurality of heat exchange tubes (3) are disposed between the two tube sheets (2), and the shell (1) is provided with a first inlet pipe (11) and a first outlet pipe (12) for shell-side fluid flow, and a second inlet pipe (13) and a second outlet pipe (14) for tube-side fluid flow, characterized in that, The bottom of the housing (1) is provided with a third input pipe (15) on one side and a third discharge pipe (16) on the other side. The outer side of the housing (1) is provided with a box (4). The box (4) contains cleaning fluid and cleaning blocks (5). The third input pipe (15) is provided with a first pump body (151). The first pump body (151) is used to transport the cleaning fluid and cleaning blocks (5) to flow back and forth in the third input pipe (15), heat exchange pipe (3), third discharge pipe (16) and box (4). The surface of the cleaning block (5) has several edges (51). The surface of the cleaning block (5) is also provided with several grooves (52). The maximum outer diameter of the cleaning block (5) is smaller than the inner diameter of the heat exchange pipe (3), the third input pipe (15) and the third discharge pipe (16). The shell (1) includes a tube box (17) and a head (18). The tube box (17) is tubular. A tube plate (2) is provided on the inner side of both ends of the tube box (17). Both end faces of the tube box (17) are connected to a head (18). A closed cavity (19) is formed between the tube plate (2) and the head (18). The cavity (19) is connected to the heat exchange tube (3). The first input pipe (11) and the first discharge pipe (12) are both connected to the tube box (17). The second input pipe (13), the second discharge pipe (14), the third input pipe (15) and the third discharge pipe (16) are all connected to the cavity (19). Each cavity (19) is provided with a piston plate (6), and each end cap (18) is provided with a threaded sleeve (181). A screw (182) is screwed into the threaded sleeve (181). One end of the screw (182) is located inside the cavity (19) and connected to the piston plate (6). The other end of the screw (182) is located outside the housing (1) and is provided with a handwheel (183). The second input pipe (13) and the third input pipe (15), and the second discharge pipe (14) and the third discharge pipe (16) are all staggered in the horizontal direction. The connection between the third input pipe (15) and the pipe box (17) is close to one of the pipe plates (2), and the connection between the third discharge pipe (16) and the pipe box (17) is close to another pipe plate (2).

2. The energy-saving shell-and-tube heat exchanger according to claim 1, characterized in that, The tube sheet (2) is bowl-shaped, and the protrusion direction of the tube sheet (2) is opposite to the protrusion direction of the adjacent end cap (18).

3. The energy-saving shell-and-tube heat exchanger according to claim 1, characterized in that, The box (4) is provided with a partition (41), which divides the internal space of the box (4) into an upper chamber (42) and a lower chamber (43). The middle part of the partition (41) is recessed downwards, and a conduit (44) is provided in the middle part of the partition (41). A valve body (440) is provided on the conduit (44). The outer wall of the housing (4) is provided with a branch pipe (45) and a water inlet pipe (46). One end of the branch pipe (45) is connected to the upper chamber (42) and the other end is connected to the third input pipe (15). The connection between the branch pipe (45) and the third input pipe (15) is located downstream of the first pump body (151). A second pump body (450) is provided on the branch pipe (45). The third input pipe (15) is connected to the lower chamber (43), the third discharge pipe is connected to the upper chamber (42), the branch pipe (45) and the third discharge pipe are located on both sides of the upper chamber (42), and the water inlet pipe (46) is used to deliver cleaning fluid into the upper chamber (42).

4. An energy-saving shell-and-tube heat exchanger according to claim 3, characterized in that, Both the housing (1) and the box (4) are provided with air inlet pipes (47), which are used to deliver gas into the cavity (19) and the upper chamber (42).

5. An energy-saving shell-and-tube heat exchanger according to claim 3, characterized in that, The piston plate (6) is made of rubber material, and the outer wall of the piston plate (6) is attached to the inner wall of the housing (1).

6. An energy-saving shell-and-tube heat exchanger according to claim 5, characterized in that, A support platform (7) is provided below the housing (1). The support platform (7) includes a bottom plate (71) and a support plate (72). The support plate (72) is connected to the housing (1) through a support seat (721). The box body (4) is located on the top of the support plate (72). One side of the base plate (71) and one side of the support plate (72) are hinged to each other. An adjustment plate (722) is provided on the other side of the base plate (71) and the other side of the support plate (72). A hydraulic cylinder (73) is provided between the two adjustment plates (722). The hydraulic cylinder (73) is used to drive the support plate (72) to rotate around the hinge.

7. An energy-saving shell-and-tube heat exchanger according to claim 6, characterized in that, The first input pipe (11), the first discharge pipe (12), the second input pipe (13), the second discharge pipe (14), the third input pipe (15), and the third discharge pipe (16) are all provided with flexible connectors (152) near the housing (1).

8. A method of using an energy-saving shell-and-tube heat exchanger, applied to the energy-saving shell-and-tube heat exchanger as described in claim 3, characterized in that... Including heat exchange steps: Turn the handwheel (183) to bring the piston plate (6) close to the end cap (18), close the first pump body (151) and the second pump body (450), input the shell-side fluid into the shell (1) through the first input pipe (11) and discharge it through the first discharge pipe (12), input the tube-side fluid into the heat exchange tube (3) through the second input pipe (13) and discharge it through the second discharge pipe (14); Cleaning steps: S1. Stop the input of tube-side fluid and shell-side fluid and close the first input pipe (11), the first discharge pipe (12), the second input pipe (13), and the second discharge pipe (14); S2. Turn the handwheel (183) to bring the piston plate (6) close to the tube sheet (2), and open the first pump body (151) and valve body (440) so that the cleaning fluid and cleaning block (5) flow in the heat exchange tube (3). S3. After running for 50-60 minutes in step S2, close the first pump body (151) and valve body (440) and open the second pump body (450) so that the cleaning fluid flows in the heat exchange tube (3); S4. After running for 20-30 minutes in step S3, turn off the second pump body (450), turn the handwheel (183) to reset the piston plate (6), and the process is complete.

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