Energy-saving shell-and-tube heat exchanger and using method thereof

Abstract

The invention discloses an energy-saving shell-and-tube heat exchanger and a using method thereof. Relates to the heat exchanger field. Comprising a shell and two tube plates arranged in the shell, a plurality of heat exchange tubes are arranged between the two tube plates in a penetrating mode, and the shell is provided with a first input tube, a first discharge tube, a second input tube and a second discharge tube, a third input pipe is arranged on one side of the bottom of the shell, a third discharge pipe is arranged on the other side of the bottom of the shell, and a box body is arranged on the outer side of the shell; cleaning liquid and a cleaning block are contained in the box body, a first pump body is arranged on the third input pipe, and the first pump body is used for conveying the cleaning liquid and the cleaning block to flow in the third input pipe, the heat exchange pipe, the third discharge pipe and the box body in a reciprocating mode. The surface of the cleaning block is provided with a plurality of edges and corners and further provided with a plurality of grooves, and the maximum outer diameter of the cleaning block is smaller than the inner diameter of the heat exchange pipe, the inner diameter of the third input pipe and the inner diameter of the third discharge pipe. The heat exchanger cleaning device has the advantage that the heat exchanger can be quickly and conveniently cleaned.

Description

Technical Field

[0001] The present application relates to the field of heat exchangers, and in particular to an energy-saving shell and tube heat exchanger. In addition, the present application also relates to a method for using the energy-saving shell and tube heat exchanger. Background Art

[0002] Shell and tube heat exchanger, also known as shell and tube heat exchanger, is a partition-type heat exchange equipment, widely used in chemical, petroleum, pharmaceutical, food and other industries.

[0003] Chinese patent document CN222718748U discloses a shell-and-tube heat exchanger that is easy to clean. The patent specifically discloses a shell, a hydraulic cylinder, a push rod, and a clamping mechanism. The shell has a front cover detachably mounted on one end, a rear cover detachably mounted on the other end, and a tube bundle mechanism mounted on the inner wall of the front cover. The hydraulic cylinders comprise multiple groups, each of which is mounted in an annular array on the outer wall of the shell. The telescopic ends of the hydraulic cylinders are fixedly connected to the outer wall of the front cover, and the hydraulic cylinders are used to drive the front cover to move along the horizontal axis of the shell. The push rods comprise multiple groups, each of which is arranged parallel to the hydraulic cylinders, with one end of each push rod fixedly connected to the outer wall of the front cover. The clamping mechanism comprises multiple groups, each of which is fixedly mounted on the outer wall of the rear cover, and each clamping mechanism corresponds one to one with the push rods. This patent improves the convenience of cleaning the interior of a shell-and-tube heat exchanger.

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

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

[0006] In a first aspect, the present application provides an energy-saving shell and tube heat exchanger, which is implemented using the following technical solution: an energy-saving shell and tube heat exchanger, comprising a shell and two tube sheets disposed within the shell, a plurality of heat exchange tubes being passed between the two tube sheets, the shell being provided with a first inlet pipe and a first outlet pipe for circulation of a shell-side fluid, and a second inlet pipe and a second outlet pipe for circulation of a tube-side fluid, a third inlet pipe being provided on one side of the bottom of the shell and a third outlet pipe being provided on the other side, and a box being provided on the outside of the shell;

[0007] The box is filled with cleaning liquid and cleaning blocks, and the third input pipe is provided with a first pump body, which is used to transport the cleaning liquid and cleaning blocks to flow back and forth in the third input pipe, the heat exchange pipe, the third discharge pipe and the 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 diameters of the heat exchange tube, the third input tube and the third discharge tube.

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

[0010] Optionally, the shell includes a tube box and a head, the tube box is tubular, a tube sheet is provided on the inner side of each end of the tube box, and both end surfaces of the tube box are connected to one of the heads, forming a closed cavity between the tube sheet and the head, and the cavity is connected to the heat exchange tube;

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

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

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

[0014] Optionally, the tube sheet is bowl-shaped, and a protruding direction of the tube sheet is opposite to a protruding direction of the adjacent head.

[0015] By adopting the above technical solution, the cavity is close to spherical, with fewer dead corners, which prevents the cleaning block from getting stuck in the cavity and further prevents the cleaning block from mixing into the pipe-side fluid.

[0016] Optionally, each of the cavities is provided with a piston plate, each of the head is provided with a threaded sleeve, a screw is screwed in the threaded sleeve, one end of the screw is located in the cavity and connected to the piston plate, and the other end of the 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 point between the third input pipe and the pipe box is close to one tube sheet, and the connection point between the third discharge pipe and the pipe box is close to the other tube sheet.

[0018] By adopting the above technical solution, the piston plate can be controlled to move in the cavity using a screw rod and a handwheel. On the one hand, the cavity volume can be changed to adapt to different working conditions. On the other hand, a cutting effect can be formed on the second input pipe and the second discharge pipe, ensuring that the cleaning liquid and the cleaning block will not enter the second input pipe or the second discharge pipe.

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

[0020] A branch pipe and a water inlet pipe are provided on the outer wall of the box body, 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 point between the branch pipe and the third input pipe is located downstream of the first pump body, and a second pump body is provided on the branch pipe;

[0021] The third input pipe is communicated with the lower chamber, the third output pipe is communicated with the upper chamber, the branch pipe and the third output pipe are respectively located on both sides of the upper chamber, and the water inlet pipe is used to transport cleaning liquid into the upper chamber.

[0022] By adopting the above technical solution, the depression in the middle of the partition and the conduit cooperate with the valve body to control the direction of the flow of the cleaning liquid. The branch pipe and the second pump body can realize the transportation of cleaning liquid through different paths. The water inlet pipe can replenish the cleaning liquid in the upper chamber in time. At the same time, when the first pump body and the valve are closed, only the cleaning liquid will flow in the heat exchange tube, which improves the cleaning effect while ensuring that no cleaning blocks will remain in the shell.

[0023] Optionally, both the shell and the box body are provided with an air inlet pipe, and the air inlet pipe is used to transport gas into the cavity and the upper chamber.

[0024] By adopting the above technical solution, the air inlet pipe on the shell is used to inflate air between the head and the piston plate, which can prevent the cleaning liquid or pipe-side fluid from penetrating between the head and the piston plate. The air inlet pipe on the box body is used to blow gas into the lower chamber. When the gas adheres to the groove of the cleaning block, it can support the cleaning block and improve the cleaning block's scraping effect 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 in contact with the inner wall of the housing.

[0026] By adopting the above technical solution, the piston plate is made of rubber and the outer wall is in contact with the inner wall of the shell, which ensures the sealing of the piston plate when it moves, avoids leakage of pipe-side fluid or cleaning fluid, and improves the stability and reliability of the heat exchanger operation.

[0027] Optionally, a support platform is provided below the shell, the support platform includes a bottom plate and a support plate, the support plate and the shell are connected via a support seat, and the box body is provided 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, and the other side of the base plate and the other side of the support plate are both provided with adjustment plates. A hydraulic cylinder is provided between the two adjustment plates, and 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 a 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 joints near the shell.

[0031] By adopting the above technical solution, during the process of adjusting the shell to the 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 adaptive adjustment margins to avoid breakage.

[0032] In a second aspect, the present application provides a method for using an energy-saving shell and tube heat exchanger, which is implemented using the following technical solution: A method for using an energy-saving shell and tube heat exchanger, applied to an energy-saving shell and tube heat exchanger according to claim 5, comprising the steps of:

[0033] Turn the hand wheel to bring the piston plate close to the head, close 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 seal the first input pipe, the first discharge pipe, the second input pipe, and the second discharge pipe;

[0036] S2. Turn the hand wheel to bring the piston plate close to the tube sheet, open the first pump body and valve body, and allow the cleaning liquid and cleaning block to flow in the heat exchange tube;

[0037] S3. After step S2 has run for 50-60 minutes, close the first pump and valve and open the second pump to allow the cleaning liquid to flow in the heat exchange tubes;

[0038] S4. After step S3 has run for 20-30 minutes, close the second pump body and turn the hand wheel to reset the piston plate. This is done.

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

[0040] Compared with the existing technology, this application has the following beneficial effects:

[0041] 1. Heat transfer between the tube-side fluid and the shell-side fluid is achieved through the first input pipe, the first discharge pipe, the second input pipe and the second discharge pipe to meet the heat exchange requirements under different working conditions.

[0042] 2. The cleaning liquid and the cleaning blocks with angular surfaces are transported by the first pump body to flow back and forth in the heat exchange tube, which can effectively clean the dirt in the heat exchange tube without disassembling the shell, thereby maximizing the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the present application Figure 1 ;

[0044] Figure 2 This is a schematic diagram of the present application Figure 2 ;

[0045] Figure 3 It is a cross-sectional view of the internal structure of the shell and box;

[0046] Figure 4 It is a reference diagram of the assembly status of the heat exchange tube and tube sheet;

[0047] Figure 5 This is a reference diagram of the assembly status of the partition and the duct;

[0048] Figure 6 is a schematic perspective view of a cleaning block;

[0049] In the figure: 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. Pipe box; 18. Head; 181. Threaded sleeve; 182. Screw rod; 183. Handwheel; 19. Cavity; 2. Tube sheet; 3. Heat exchange tube; 4. Box; 41. Partition; 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. Edges and corners; 52. Grooves; 6. Piston plate; 7. Support platform; 71. Bottom plate; 72. Support plate; 721. Support seat; 722. Adjustment plate; 73. Hydraulic cylinder. DETAILED DESCRIPTION

[0050] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no 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. One side of the base plate 71 and one side of the support plate 72 are hinged to each other. The other side of the base plate 71 and the other side of the support plate 72 are each provided with an adjustment plate 722. 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 about the hinge. The support plate 72 is connected to the shell 1 via a support base 721, and the box body 4 is located on top of the support plate 72. When the support plate 72 and the bottom plate 71 are in contact with each other, the push rod of the hydraulic cylinder 73 is in a retracted state and the shell 1 is in a horizontal state. When the push rod of the hydraulic cylinder 73 is extended, the distance between the two adjustment plates 722 is expanded, and the support plate 72 will be lifted up. 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 shell 1 can be adjusted, that is, the shell 1 can be transformed from a horizontal state to an inclined state.

[0052] The shell 1 includes a tube box 17 and a head 18. The tube box 17 is tubular, with a tube sheet 2 located inside each end of the tube box 17. Each end face of the tube box 17 is connected to a head 18. Specifically, the tube box 17 and the head 18 can be connected via flanges. A sealed cavity 19 is formed between the tube sheet 2 and the head 18, which communicates with the heat exchange tubes 3. Several heat exchange tubes 3 are threaded between the two tube sheets 2. A first inlet pipe 11 is located on one side of the upper portion of the shell 1, a first outlet pipe 12 is located on the other side of the lower portion of the shell 1, a second inlet pipe 13 is located on the other side of the upper portion of the shell 1, and a second outlet pipe 14 is located on one side of the upper portion of the shell 1. The outer walls of the tube sheets 2 are in contact with the inner walls of the tube box 17, creating a sealed space between the two tube sheets 2. The first inlet pipe 11 and the first outlet pipe 12 both communicate with the tube box 17, with the connection point located between the pair of tube sheets 2. The first input pipe 11 can input shell-side fluid into the pipe box 17. After entering the pipe box 17, the shell-side fluid contacts the outer wall of the heat exchange tube 3, then moves axially along the pipe box 17, and is ultimately discharged through the first discharge pipe 12. The second input pipe 13 communicates with one cavity 19, and the second discharge pipe 14 communicates with another cavity 19. Thus, after being input into one cavity 19 through the second input pipe 13, the tube-side fluid can evenly enter all of the heat exchange tubes 3. As the tube-side fluid flows through the heat exchange tubes 3, its heat is transferred to the shell-side fluid, thereby achieving heat exchange. After the tube-side fluid reaches the other cavity 19, it can be discharged outward through the second discharge pipe 14. In this way, through the continuous input and discharge of tube-side and shell-side fluids, heat exchange can be reliably achieved.

[0053] Each cavity 19 is provided with a piston plate 6, and each head 18 is provided with a threaded sleeve 181. A screw 182 is adapted to be screwed into the threaded sleeve 181. One end of the screw 182 is located in the cavity 19 and is 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. By turning the handwheel 183, the depth of the screw 182 screwed into the housing 1 can be changed, thereby achieving the driving effect on the piston plate 6. When the screw 182 is connected to the piston plate 6, the rotation of the screw 182 can drive the piston plate 6 to rotate and move along the axial direction of the screw 182. When the screw 182 and the piston plate 6 are connected by a bearing, the rotation of the screw 182 can cause the piston plate 6 to translate along the axial direction of the screw 182. The size of the cavity 19 can be adjusted by the movement of the piston plate 6 to adapt to different working conditions. The bottom of the housing 1 is provided with a third inlet pipe 15 on one side and a third outlet pipe 16 on the other side. A housing 4 is located outside the housing 1. The housing 4 contains cleaning fluid and a cleaning block 5. A first pump 151 is mounted on the third inlet pipe 15, which is used to pump the cleaning fluid and the cleaning block 5 back and forth through the third inlet pipe 15, the heat exchange tubes 3, the third outlet pipe 16, and the housing 4. The cleaning block 5 has several edges and corners 51 and grooves 52 on its surface. The maximum outer diameter of the cleaning block 5 is smaller than the inner diameters of the heat exchange tubes 3, the third inlet pipe 15, and the third outlet pipe 16. A partition 41 is located within the housing 4, dividing the interior of the housing 4 into an upper chamber 42 and a lower chamber 43. The center of the partition 41 is recessed downward, and a conduit 44 is located in the middle of the partition 41. This conduit 44 is equipped with a valve 440. A branch pipe 45 and a water inlet pipe 46 are provided on the outer wall of the housing 4. One end of the branch pipe 45 communicates with the upper chamber 42, and the other end communicates with the third input pipe 15. The connection point 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 communicates with the lower chamber 43, and the third output pipe communicates with the upper chamber 42. The branch pipe 45 and the third output pipe are located on either side of the upper chamber 42. The water inlet pipe 46 is used to transport cleaning fluid into the upper chamber 42.

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

[0055] When the heat exchanger needs cleaning, the input of tube-side and shell-side fluids is stopped, and the handwheel 183 is turned to adjust the position of the piston plate 6. Since the second input pipe 13 and the third input pipe 15, as well as the second discharge pipe 14 and the third discharge pipe 16, are horizontally staggered, the connection between the third input pipe 15 and the pipe box 17 is close to one tube sheet 2, while the connection between the third discharge pipe 16 and the pipe box 17 is close to the other tube sheet 2. This results in one end of the second input pipe 13 and the heat exchange tube 3 being located on either side of one piston plate 6, while the other end of the second discharge pipe 14 and the heat exchange tube 3 are located on either side of the other piston plate 6. In other words, the second input pipe 13 is now isolated from one cavity 19, and the second discharge pipe 14 is isolated from the other 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 liquid and cleaning block 5 in the lower chamber 43 into one cavity 19. After entering one cavity 19, the cleaning liquid carrying the cleaning block 5 enters the heat exchange tube 3, then flows through the other cavity 19 and the third discharge pipe 16 to the upper chamber 42, and finally flows back into the lower chamber 43 through the conduit 44. As the cleaning liquid and cleaning block 5 flow within the heat exchange tube 3, the cleaning liquid can flush the inner wall of the heat exchange tube 3, providing a preliminary cleansing of dirt adhering to the inner wall of the heat exchange tube 3. The cleaning block will randomly flip during movement. At the same time, the sharp corners 51 on its surface will frequently impact the inner wall of the heat exchange tube 3, thereby scraping away dirt and improving the cleaning effect. Furthermore, an air inlet pipe 47 is provided on both the shell 1 and the box body 4. When the air inlet pipe 47 on the box body 4 transports gas into the lower chamber 43, the gas will be filled into the cleaning liquid. Since a number of grooves 52 are provided on the surface of the cleaning block 5, part of the 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 without disassembling the shell 1.

[0057] An overflow pipe 48 is also provided on the outer wall of the housing 4. The overflow pipe 48 is located above the lower chamber 43. After a period of cleaning, cleaning liquid can be injected into the upper chamber 42 through the water inlet pipe 46. When the cleaning liquid is excessive, it can be automatically discharged through the overflow pipe 48, thereby diluting the dirt in the cleaning liquid. After the cleaning liquid and the cleaning blocks 5 have been circulated multiple times, the first pump body 151 is closed, the second pump body 450 is opened, and the cleaning liquid is pumped into the upper chamber 42 through the water inlet pipe 46. At this time, after the cleaning liquid flows back into the upper chamber 42, a portion will re-enter the heat exchange tube 3 through the branch pipe 45, and another portion will flow through the conduit 44 into the lower chamber 43 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 less dirt in the cleaning fluid, the water inlet pipe 46 stops conveying the cleaning fluid and closes the valve body 440. At this point, the flow of the cleaning fluid in the cavity 19 and the heat exchange tube 3 can bring all the cleaning blocks 5 in the heat exchanger into the upper chamber 42. Since the middle portion of the partition 41 is recessed downward, the cleaning blocks 5 will gather in the middle portion of the partition 41 and in the conduit 44, ensuring that no cleaning blocks 5 will be 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 causing the support platform 7 to change from a horizontal state to an inclined state, which also causes the housing 1 to be inclined. Specifically, the height of the third inlet pipe 15 will be higher than the height of the third outlet pipe 16, which can improve the reflux 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 provided with flexible joints 152 near the shell 1. In this way, it is ensured 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 be adaptively deflected to avoid breakage during the gradual tilting of the shell 1.

[0058] Furthermore, tube sheet 2 is bowl-shaped, with the protrusion of tube sheet 2 in the opposite direction to that of the adjacent head 18. That is, the cavity 19 formed between the corresponding head 18 and tube sheet 2 can be nearly spherical, thereby preventing cleaning block 5 from becoming stuck within cavity 19. Piston plate 6 is made of rubber, and the outer wall of piston plate 6 fits closely to the inner wall of housing 1, thus ensuring that cleaning fluid or pipe-side fluid does not leak to the other side of piston plate 6. Furthermore, when air inlet pipe 47 on housing 1 supplies air into cavity 19, the pressure in the portion of cavity 19 between head 18 and piston plate 6 increases, thereby improving the anti-leakage effect.

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

[0060] A method for using an energy-saving shell and tube heat exchanger is applied to an energy-saving shell and tube heat exchanger, comprising the steps of:

[0061] Turn the hand wheel 183 to bring the piston plate 6 close to the head 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 seal 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 hand wheel 183 to move the piston plate 6 close to the tube sheet 2, open the first pump body 151 and the valve body 440, and allow the cleaning liquid and the cleaning block 5 to flow in the heat exchange tube 3;

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

[0066] S4. After step S3 has run for 20-30 minutes, close the second pump body 450, turn the hand wheel 183 to reset the piston plate 6, and the process is complete.

[0067] The present application can reliably clean the inner wall of the heat exchange tube 3 without disassembling the shell 1, and improves the cleaning efficiency to the greatest extent.

[0068] The above-mentioned embodiments are only preferred embodiments of the present application and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and replacements made by technicians in this field based on the present application shall fall within the scope of protection required by the present application.

Claims

1. An energy-saving shell and tube heat exchanger, comprising a shell (1) and two tube sheets (2) arranged in the shell (1), a plurality of heat exchange tubes (3) passing through the two tube sheets (2), the shell (1) being provided with a first input pipe (11) and a first discharge pipe (12) for circulation of shell-side fluid, and a second input pipe (13) and a second discharge pipe (14) for circulation of tube-side fluid, characterized in that: A third input pipe (15) is provided on one side of the bottom of the shell (1), and a third discharge pipe (16) is provided on the other side. A box body (4) is provided on the outside of the shell (1). The box (4) contains a cleaning liquid and a cleaning block (5), and a first pump body (151) is provided on the third input pipe (15). The first pump body (151) is used to transport the cleaning liquid and the cleaning block (5) to flow back and forth in the third input pipe (15), the heat exchange pipe (3), the third discharge pipe (16) and the box (4); The surface of the cleaning block (5) has a plurality of sharp corners (51), and the surface of the cleaning block (5) is also provided with a plurality of grooves (52). The maximum outer diameter of the cleaning block (5) is smaller than the inner diameters of the heat exchange tube (3), the third input tube (15) and the third discharge tube (16).

2. The energy-saving shell and tube heat exchanger according to claim 1, characterized in that: The shell (1) includes a tube box (17) and a head (18), the tube box (17) is tubular, and a tube sheet (2) is provided on the inner side of both ends of the tube box (17), and both end faces of the tube box (17) are connected to a head (18), and a closed cavity (19) is formed between the tube sheet (2) and the head (18), and the cavity (19) is in communication with the heat exchange tube (3); The first input pipe (11) and the first discharge pipe (12) are both in communication with the pipe box (17), and the second input pipe (13), the second discharge pipe (14), the third input pipe (15) and the third discharge pipe (16) are all in communication with the cavity (19).

3. The energy-saving shell and tube heat exchanger according to claim 2, characterized in that: The tube sheet (2) is bowl-shaped, and the protruding direction of the tube sheet (2) is opposite to the protruding direction of the adjacent head (18).

4. The energy-saving shell and tube heat exchanger according to claim 2, characterized in that: A piston plate (6) is provided in each cavity (19), a threaded sleeve (181) is provided on each head (18), a screw rod (182) is provided in the threaded sleeve (181), one end of the screw rod (182) is located in the cavity (19) and connected to the piston plate (6), and the other end of the screw rod (182) is located outside the housing (1) and is provided with a hand wheel (183); The second input pipe (13) and the third input pipe (15), as well as the second discharge pipe (14) and the third discharge pipe (16) are all staggered in the horizontal direction. The connection point between the third input pipe (15) and the pipe box (17) is close to one tube sheet (2), and the connection point between the third discharge pipe (16) and the pipe box (17) is close to another tube sheet (2).

5. The energy-saving shell and tube heat exchanger according to claim 4, characterized in that: A partition (41) is provided in the box body (4), and the partition (41) divides the internal space of the box body (4) into an upper chamber (42) and a lower chamber (43). The middle portion of the partition (41) is recessed downward, and a conduit (44) is provided in the middle portion of the partition (41). A valve body (440) is provided on the conduit (44); A branch pipe (45) and a water inlet pipe (46) are provided on the outer wall of the box body (4); 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 point between the branch pipe (45) and the third input pipe (15) is located downstream of the first pump body (151); and a second pump body (450) is provided on the branch pipe (45); The third input pipe (15) is in communication with the lower chamber (43), the third output pipe is in communication with the upper chamber (42), the branch pipe (45) and the third output pipe are respectively located on both sides of the upper chamber (42), and the water inlet pipe (46) is used to transport cleaning liquid into the upper chamber (42).

6. The energy-saving shell and tube heat exchanger according to claim 5, characterized in that: An air inlet pipe (47) is provided on both the shell (1) and the box (4), and the air inlet pipe (47) is used to transport gas into the cavity (19) and the upper chamber (42).

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

8. The energy-saving shell and tube heat exchanger according to claim 7, characterized in that: A support platform (7) is provided below the shell (1), the support platform (7) comprising a bottom plate (71) and a support plate (72), the support plate (72) and the shell (1) are connected via a support seat (721), and the box (4) is provided on top of the support plate (72); One side of the bottom plate (71) and one side of the support plate (72) are hinged to each other, and the other side of the bottom plate (71) and the other side of the support plate (72) are both provided with adjustment plates (722). A hydraulic cylinder (73) is provided between the two adjustment plates (722), and the hydraulic cylinder (73) is used to drive the support plate (72) to rotate around the hinge.

9. The energy-saving shell and tube heat exchanger according to claim 8, 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 joints (152) near the housing (1).

10. A method for using an energy-saving shell and tube heat exchanger, applied to the energy-saving shell and tube heat exchanger according to claim 5, characterized in that: Including heat exchange steps: Turn the hand wheel (183) so that the piston plate (6) is close to the head (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); 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 hand wheel (183) to move the piston plate (6) close to the tube plate (2), open the first pump body (151) and the valve body (440), and allow the cleaning liquid and the cleaning block (5) to flow in the heat exchange tube (3); S3. After step S2 has been running for 50-60 minutes, the first pump body (151) and the valve body (440) are closed and the second pump body (450) is opened, so that the cleaning liquid flows in the heat exchange tube (3); S4. After step S3 has run for 20-30 minutes, close the second pump body (450), turn the hand wheel (183) to reset the piston plate (6), and the process is complete.

Images