High-efficiency heat exchanger for petrochemical industry

Abstract

The application discloses a kind of high-efficiency heat exchanger for petrochemical industry, belongs to the field of heat exchanger, including shell;The top of shell is equipped with reflux tank, the bottom of shell is equipped with feed tank and discharge tank;Two cylindrical supports are vertically rotated and inserted on the inner bottom wall of reflux tank, the bottom of two supports extends to the inner top wall of feed tank and discharge tank respectively;A plurality of heat pipes are fixed and inserted on each support, and the two ends of heat pipe penetrate through corresponding support;Rotary mechanism for driving support rotation is provided on reflux tank;Each heat pipe is movably sleeved with a circular ring, and the circular ring is used for scraping the outer wall of heat pipe;Through the cooperation of support, rotary mechanism and heat pipe, in the working process, the impurities adhering to the surface of heat pipe can be thrown away by rotary mechanism driving support rotation, and the high-temperature fluid in the shell can be stirred by the rotating heat pipe, increasing the probability of contact between unheated high-temperature fluid and heat pipe, and improving the heat transfer effect.

Description

Technical Field

[0001] This invention relates to the field of heat exchangers, and more specifically, to a high-efficiency heat exchanger for petrochemical applications. Background Technology

[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food, and many other industrial production processes. In chemical production, heat exchangers are widely used as heaters, coolers, condensers, evaporators, and reboilers.

[0003] When a chemical heat exchanger is in operation, it typically continuously introduces hot fluid into the shell side while simultaneously introducing chemical petroleum raw materials requiring heat exchange into the tube side. Heat exchange is achieved through the flow of the petroleum raw materials and the heat medium.

[0004] In petrochemical heat exchangers, high-viscosity fluids, solid-containing slurries, or media prone to coking are typically distributed to the shell side during operation. The larger space in the shell side facilitates the installation of mechanical scrapers or the implementation of PIG cleaning technology, which is beneficial for fouling removal. However, such media tend to form a fouling layer on the outer wall of the heat exchange tubes when flowing in the shell side, significantly reducing heat transfer efficiency. In addition, flow dead zones can easily form in low-velocity regions such as the back side of the baffles, resulting in insufficient contact between the fluid and the heat exchange tubes, further weakening heat transfer performance.

[0005] Therefore, a high-efficiency heat exchanger for petrochemical applications is proposed. Summary of the Invention

[0006] To address the problems existing in the prior art, the purpose of this invention is to provide a high-efficiency heat exchanger for petrochemical applications, which can increase the probability of contact between the high-temperature fluid in the shell and the heat-conducting tube, thereby improving the heat exchange effect.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A high-efficiency heat exchanger for petrochemical applications, comprising a shell;

[0009] The top of the shell is equipped with a return box, and the bottom of the shell is equipped with a feed box and a discharge box;

[0010] Two cylindrical supports are vertically and rotatably inserted into the inner bottom wall of the return box, with the bottom ends of the two supports extending to the inner top wall of the feed box and the inner top wall of the discharge box, respectively.

[0011] Each bracket is fixedly fitted with multiple heat pipes, and both ends of the heat pipes pass through the corresponding bracket.

[0012] The return box is equipped with a rotating mechanism for driving the support to rotate;

[0013] Each heat pipe is fitted with a movable ring sleeve, which is used to scrape the outer wall of the heat pipe. Each bracket is also equipped with a drive mechanism to drive the corresponding ring sleeve to reciprocate along the surface of the corresponding heat pipe.

[0014] Furthermore, the rotating mechanism includes a driving gear and a driven gear, which are respectively fixedly mounted on the rotating shafts of two supports. The driven gear meshes with the driving gear, and a motor for driving the driving gear to rotate is fixedly mounted on the top wall of the return box.

[0015] Furthermore, the drive mechanism includes mounting rods that are vertically rotatably inserted into the bottom walls of the two brackets respectively;

[0016] The bottom ends of the two mounting rods are fixedly connected to the bottom walls of the corresponding feed box and the discharge box, respectively.

[0017] Each mounting rod is equipped with a reciprocating lead screw at its top, and both reciprocating lead screws are threaded with sliders.

[0018] A connecting frame is fixedly installed on the side wall of the slider, and the connecting frame is fixedly connected to all the ring sleeves on the corresponding bracket.

[0019] Furthermore, bellows are fixedly installed on both the top and bottom walls of the slider. The bellows are sleeved on the reciprocating lead screw, and the end of each bellows away from the slider is fixedly connected to the bracket.

[0020] Furthermore, the top and bottom walls of the support are provided with flow guiding cavities, and the side walls of the two adjacent flow guiding cavities are provided with multiple pressure relief holes. The housing is provided with a transfer mechanism for transferring the high-temperature fluid located between the inner wall of the housing and the outer wall of the support to the flow guiding cavities.

[0021] Furthermore, the corrugated pipe includes an inner pipe and an outer pipe, with the outer pipe fixedly sleeved on the outside of the inner pipe. The transfer mechanism includes a cavity opened on the inner side wall of the outer pipe, with an inlet valve and a drain valve embedded on the side wall of the cavity. The output end of the drain valve is connected to the guide cavity, and a conduit is fixedly installed on the input end of the inlet valve. The distance between the end of the conduit away from the inlet valve and the inner wall of the shell is 0.5-1 cm.

[0022] Furthermore, stirring rods are evenly fixedly installed on the outer wall of the support.

[0023] Furthermore, the bellows is made of nickel-based superalloy material.

[0024] Furthermore, both the top and bottom walls of the ring are inclined surfaces.

[0025] Furthermore, a through hole is provided on the bottom wall of the bracket, and both the mounting rod and the side wall of the through hole are mirrored, with the mounting rod inserted into the through hole.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] (1) This solution uses the cooperation of the support, the rotating mechanism and the heat pipe to drive the support to rotate during the operation, thereby throwing off the impurities attached to the surface of the heat pipe. At the same time, the rotating heat pipe can stir the high-temperature fluid in the shell, increasing the probability of the high-temperature fluid that has not been heat exchanged coming into contact with the heat pipe and improving the heat conduction effect.

[0028] (2) This solution, through the cooperation of the bracket, the ring sleeve, the reciprocating screw and the connecting frame, can drive the ring sleeve to reciprocate on the surface of the heat pipe during the rotation of the bracket, thereby cleaning the impurities attached to the surface of the heat pipe through the ring sleeve, ensuring that the high temperature fluid can directly contact the heat pipe and ensure normal heat exchange.

[0029] (3) This scheme uses the cooperation between the bellows and the slider. When the bellows is squeezed, the high-temperature fluid in the bellows is discharged into the guide cavity through the drain valve, and then discharged along the pressure relief hole on the side wall of the guide cavity. At this time, the high-temperature fluid discharged from the pressure relief hole impacts the fluid that has completed heat exchange in the space between each heat pipe, thereby breaking the fluid that has completed heat exchange from the gap between the heat pipes, so that the high-temperature fluid discharged from the pressure relief hole directly contacts the heat pipe, further improving the heat exchange effect. Attached Figure Description

[0030] Figure 1 This is a top view of the structure of the present invention;

[0031] Figure 2 This is a bottom-view structural diagram of the present invention;

[0032] Figure 3 This is a schematic diagram of the combined structure of the bracket and the housing of the present invention;

[0033] Figure 4 This is a schematic diagram of the combined structure of the bracket, heat pipe, and connecting frame of the present invention;

[0034] Figure 5 This is a front cross-sectional view of the present invention;

[0035] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A;

[0036] Figure 7 For the present invention Figure 5 Enlarged structural diagram at point B;

[0037] Figure 8 For the present invention Figure 5 Enlarged structural diagram at point C;

[0038] Figure 9 This is a cross-sectional view of the support structure of the present invention.

[0039] Explanation of the labels in the diagram:

[0040] 1. Shell; 2. Reflux box; 3. Feed box; 4. Discharge box; 5. Support; 6. Heat pipe; 7. Circular sleeve; 8. Drive gear; 9. Driven gear; 10. Motor; 11. Mounting rod; 12. Reciprocating screw; 13. Slider; 14. Connecting frame; 15. Bellows; 1501. Inner tube; 1502. Outer tube; 16. Guide cavity; 17. Pressure relief hole; 18. Cavity; 19. Water inlet valve; 20. Drain valve; 21. Guide tube; 22. Stirring rod. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Example 1:

[0043] Please see Figures 1 to 9 A high-efficiency heat exchanger for petrochemical applications includes a shell 1, wherein an inlet and an outlet are respectively provided on the side wall of the shell 1, the inlet and outlet are located on opposite side walls of the shell 1, and the inlet is located below the outlet.

[0044] The top of the shell 1 is provided with a return box 2, and the bottom of the shell 1 is provided with a feed box 3 and a discharge box 4.

[0045] Two cylindrical supports 5 are vertically and rotatably inserted into the inner bottom wall of the return box 2, and the bottom ends of the two supports 5 extend to the inner top wall of the feed box 3 and the inner top wall of the discharge box 4, respectively.

[0046] Multiple heat pipes 6 are fixedly inserted into each bracket 5, and both ends of the heat pipes 6 pass through the corresponding bracket 5.

[0047] First, hot fluid is injected into the shell 1 through the inlet. The level of hot fluid in the shell 1 gradually rises until the hot fluid is discharged through the outlet.

[0048] Simultaneously, a low-temperature fluid is injected into the feed box 3. The low-temperature fluid in the feed box 3 flows through the heat-conducting pipe 6 connected to the feed box 3 into the return box 2. Then, the fluid in the return box 2 flows along the heat-conducting pipe 6 connected to the discharge box 4 into the discharge box 4, and is finally discharged through the outlet on the discharge box 4.

[0049] Since the heat pipe 6 is located inside the housing 1, when the low-temperature fluid flows in the heat pipe 6, the hot fluid inside the housing 1 transfers heat to the low-temperature fluid in the heat pipe 6 through heat exchange.

[0050] The return box 2 is equipped with a rotating mechanism for driving the support 5 to rotate;

[0051] The rotating mechanism drives the support 5 to rotate, which agitates the hot fluid inside the shell 1, increases the contact probability between the hot fluid inside the shell 1 and the heat pipe 6, and improves the heat exchange effect.

[0052] Each heat pipe 6 is movably fitted with a circular ring 7, which is used to scrape the outer wall of the heat pipe 6. Each bracket 5 is equipped with a drive mechanism to drive the corresponding circular ring 7 to reciprocate along the surface of the corresponding heat pipe 6.

[0053] like Figure 5 As shown, the rotating mechanism includes a driving gear 8 and a driven gear 9, which are respectively fixedly mounted on the rotating shafts of two brackets 5. The driven gear 9 meshes with the driving gear 8, and a motor 10 for driving the driving gear 8 to rotate is fixedly mounted on the top wall of the return box 2. The power output end of the motor 10 is fixedly connected to the rotating shaft of the driving gear 8.

[0054] During operation, the motor 10 is powered on. At this time, the motor 10 drives the driven gear 9 to rotate together through the driving gear 8, so that the two brackets 5 rotate simultaneously.

[0055] like Figure 5 As shown, the drive mechanism includes mounting rods 11 that are vertically and rotatably inserted into the bottom walls of the two brackets 5 respectively;

[0056] The bottom ends of the two mounting rods 11 are fixedly connected to the bottom wall of the corresponding feed box 3 and the bottom wall of the discharge box 4, respectively; when the bracket 5 rotates, the two mounting rods 11 can maintain a relatively stationary state.

[0057] Each mounting rod 11 is equipped with a reciprocating lead screw 12 at its top, and a slider 13 is threaded onto each of the two reciprocating lead screws 12. The slider 13 is threaded onto the reciprocating lead screw 12. When the reciprocating lead screw 12 is fixed, rotating the slider 13 will cause the slider 13 to reciprocate along the reciprocating lead screw 12. This is existing technology and will not be described in detail here.

[0058] A connecting frame 14 is fixedly installed on the side wall of the slider 13, and the connecting frame 14 is fixedly connected to all the ring sleeves 7 on the corresponding bracket 5;

[0059] During operation, the bracket 5 drives the heat pipe 6 mounted on it to rotate. The rotating heat pipe 6 drives the annular sleeve 7 fitted on its outer wall to rotate as well. Under the action of the connecting frame 14, the slider 13 also rotates. The rotating slider 13 will reciprocate along the reciprocating screw 12, thereby driving the connecting frame 14 and the annular sleeve 7 to reciprocate on the surface of the corresponding heat pipe 6. At this time, the annular sleeve 7 scrapes the surface of the heat pipe 6, thereby cleaning the impurities adhering to the surface of the heat pipe 6, allowing the heat fluid to directly contact the heat pipe 6, thus improving the heat exchange effect.

[0060] like Figure 5 , Figure 6 As shown, bellows 15 are fixedly installed on both the top and bottom walls of the slider 13. The bellows 15 are sleeved on the reciprocating screw 12, and the end of each bellows 15 away from the slider 13 is fixedly connected to the bracket 5. Since the reciprocating screw 12 is placed in the housing 1, by fixing the two ends of the bellows 15 to the slider 13 and the side wall of the bracket 5 respectively, it is possible to prevent the viscous high-temperature fluid in the housing 1 from adhering to the surface of the reciprocating screw 12, thus ensuring that the slider 13 can move normally along the reciprocating screw 12.

[0061] like Figure 7 As shown, the top and bottom walls of the support 5 are provided with flow guiding cavities 16, and the side walls of the two adjacent flow guiding cavities 16 are provided with multiple pressure relief holes 17. The housing 1 is provided with a transfer mechanism for transferring the high-temperature fluid located between the inner wall of the housing 1 and the outer wall of the support 5 to the flow guiding cavity 16.

[0062] The corrugated pipe 15 includes an inner pipe 1501 and an outer pipe 1502. The outer pipe 1502 is fixedly sleeved on the outside of the inner pipe 1501. The transfer mechanism includes a cavity 18 opened on the inner side wall of the outer pipe 1502. An inlet valve 19 and a drain valve 20 are embedded on the side wall of the cavity 18. The output end of the drain valve 20 is connected to the guide cavity 16. A conduit 21 is fixedly installed on the input end of the inlet valve 19. The distance between the end of the conduit 21 away from the inlet valve 19 and the inner wall of the housing 1 is 0.5-1 cm.

[0063] As the slider 13 reciprocates along the reciprocating screw 12, the bellows 15 is intermittently stretched and compressed.

[0064] When the bellows 15 is stretched, the cavity 18 absorbs high-temperature fluid from the space between the support 5 and the inner wall of the housing 1 through the water inlet valve 19 and the conduit 21.

[0065] When the bellows 15 is squeezed, the high-temperature fluid in the bellows 15 is discharged into the guide cavity 16 through the drain valve 20, and then discharged along the pressure relief hole 17 on the side wall of the guide cavity 16. At this time, the high-temperature fluid discharged from the pressure relief hole 17 impacts the fluid that has completed heat exchange in the space between each heat pipe 6, thereby opening the gap between the heat pipes 6 and allowing the high-temperature fluid discharged from the pressure relief hole 17 to directly contact the heat pipes 6, further improving the heat exchange effect.

[0066] like Figure 4 , Figure 5 As shown, stirring rods 22 are uniformly fixed on the outer wall of the support 5. When the support 5 drives the stirring rods 22 to rotate, the stirring rods 22 stir the high-temperature fluid in the housing 1, further increasing the probability that the high-temperature fluid will come into direct contact with the heat pipe 6.

[0067] like Figure 4 As shown, the bellows 15 is made of nickel-based high-temperature alloy material. Because nickel-based high-temperature alloy material is resistant to high temperature and corrosion, it plays a role in ensuring that the bellows 15 can work normally.

[0068] like Figure 1 As shown, the top and bottom walls of the annular sleeve 7 are both inclined surfaces, and the geometry of the inclined surfaces provides a more optimized "entry angle". When the inclined surfaces are inserted into the material, they can more effectively separate impurities from the outer wall of the heat pipe 6, reducing initial resistance.

[0069] like Figure 6 As shown, a through hole is provided on the bottom wall of the bracket 5. The mounting rod 11 and the side wall of the through hole are both mirrored. The mounting rod 11 is inserted into the through hole, so that the side wall of the mounting rod 11 can fit tightly with the side wall of the through hole, preventing the liquid in the housing 1 from mixing with the liquid in the feed box 3.

[0070] Instructions for use: First, inject hot fluid into the housing 1 through the inlet. The level of hot fluid in the housing 1 will gradually rise until the hot fluid is discharged through the outlet.

[0071] Simultaneously, a low-temperature fluid is injected into the feed box 3. The low-temperature fluid in the feed box 3 flows through the heat-conducting pipe 6 connected to the feed box 3 into the return box 2. Then, the fluid in the return box 2 flows along the heat-conducting pipe 6 connected to the discharge box 4 into the discharge box 4, and is finally discharged through the outlet on the discharge box 4.

[0072] Since the heat pipe 6 is located inside the shell 1, when the low-temperature fluid flows in the heat pipe 6, the hot fluid inside the shell 1 transfers heat to the low-temperature fluid in the heat pipe 6 through heat exchange.

[0073] The rotating mechanism drives the support 5 to rotate, which agitates the hot fluid inside the shell 1, increases the contact probability between the hot fluid inside the shell 1 and the heat pipe 6, and improves the heat exchange effect.

[0074] During operation, the bracket 5 drives the heat pipe 6 mounted on it to rotate. The rotating heat pipe 6 also drives the annular sleeve 7 fitted onto its outer wall to rotate. Simultaneously, under the action of the connecting frame 14, the slider 13 also rotates. The rotating slider 13 reciprocates along the reciprocating screw 12, thereby driving the connecting frame 14 and the annular sleeve 7 to reciprocate on the surface of the corresponding heat pipe 6. The annular sleeve 7 scrapes against the surface of the heat pipe 6, cleaning away impurities adhering to it and allowing the hot fluid to directly contact the heat pipe 6, improving heat exchange efficiency. During the reciprocating motion of the slider 13 along the reciprocating screw 12, the bellows 15 is intermittently stretched and compressed.

[0075] When the bellows 15 is stretched, the cavity 18 absorbs high-temperature fluid from the space between the support 5 and the inner wall of the housing 1 through the water inlet valve 19 and the conduit 21.

[0076] When the bellows 15 is compressed, the high-temperature fluid in the bellows 15 is discharged into the guide cavity 16 through the drain valve 20, and then discharged along the pressure relief hole 17 on the side wall of the guide cavity 16. At this time, the high-temperature fluid discharged from the pressure relief hole 17 impacts the fluid that has completed heat exchange in the space between each heat-conducting pipe 6, thereby opening the gap between the heat-conducting pipes 6 and allowing the high-temperature fluid discharged from the pressure relief hole 17 to directly contact the heat-conducting pipes 6, further improving the heat exchange effect. The top and bottom walls of the annular sleeve 7 are both inclined surfaces, and the geometry of the inclined surfaces provides a more optimized "entry angle". When the inclined surfaces are inserted into the material, they can more effectively separate impurities from the outer wall of the heat-conducting pipe 6, reducing initial resistance.

[0077] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency heat exchanger for petrochemical industry, comprising a shell (1); characterized in that The top end of the shell (1) is provided with a reflux tank (2), and the bottom end of the shell (1) is provided with a feed tank (3) and a discharge tank (4); Two cylindrical supports (5) are vertically rotatably inserted into the inner bottom wall of the reflux tank (2), and the bottom ends of the two supports (5) respectively extend to the inner top wall of the feed tank (3) and the inner top wall of the discharge tank (4); A plurality of heat conducting pipes (6) are fixedly inserted into each support (5), and the two ends of the heat conducting pipe (6) penetrate through the corresponding support (5); The reflux tank (2) is provided with a rotating mechanism for driving the rotation of the support (5); A circular ring sleeve (7) is movably sleeved on each heat conducting pipe (6), which is used for scraping the outer wall of the heat conducting pipe (6), and each support (5) is provided with a driving mechanism for driving the corresponding circular ring sleeve (7) to make reciprocating motion along the surface of the corresponding heat conducting pipe (6); The driving mechanism comprises mounting rods (11) which are vertically rotatably inserted into the inner bottom walls of the two supports (5); The bottom ends of the two mounting rods (11) are fixedly connected with the inner bottom walls of the corresponding feed tank (3) and discharge tank (4); A reciprocating screw rod (12) is mounted at the top end of each mounting rod (11), and a sliding block (13) is threadedly mounted on the two reciprocating screw rods (12); A connecting frame (14) is fixedly mounted on the side wall of the sliding block (13), and the connecting frame (14) is fixedly connected with all the circular ring sleeves (7) on the corresponding support (5); A bellows (15) is fixedly mounted on the top wall and the bottom wall of the sliding block (13), the bellows (15) is sleeved on the reciprocating screw rod (12), and one end of each bellows (15) away from the sliding block (13) is fixedly connected with the support (5); Flow guide cavities (16) are formed in the top wall and the bottom wall of the support (5), a plurality of pressure relief holes (17) are formed in the side walls of the two adjacent flow guide cavities (16), and a transfer mechanism is arranged in the shell (1) for transferring high-temperature fluid between the inner wall of the shell (1) and the outer wall of the support (5) to the flow guide cavities (16); The bellows (15) comprises an inner tube (1501) and an outer tube (1502), the outer tube (1502) is fixedly sleeved outside the inner tube (1501), the transfer mechanism comprises a cavity (18) formed in the inner side wall of the outer tube (1502), a water inlet valve (19) and a drain valve (20) are embedded in the side wall of the cavity (18), the output end of the drain valve (20) is communicated with the flow guide cavity (16), and a water pipe (21) is fixedly mounted on the input end of the water inlet valve (19), the distance between the water pipe (21) away from the water inlet valve (19) and the inner wall of the shell (1) is 0.5-1 cm; Stirring rods (22) are uniformly fixedly mounted on the outer side wall of the support (5).

2. The high-efficiency heat exchanger for petroleum chemical industry according to claim 1, characterized in that: The rotating mechanism comprises a driving gear (8) and a driven gear (9) fixedly installed on the rotating shafts of the two supports (5) respectively, the driven gear (9) is engaged with the driving gear (8), and a motor (10) for driving the driving gear (8) to rotate is fixedly installed on the top wall of the return flow box (2).

3. The high-efficiency heat exchanger for petroleum chemical industry according to claim 1, characterized in that: The bellows (15) are made of nickel-based high-temperature alloy material.

4. The high-efficiency heat exchanger for petroleum chemical industry according to claim 1, characterized in that: The top wall and the bottom wall of the circular ring sleeve (7) are both inclined surfaces.

5. The high-efficiency heat exchanger for petroleum chemical industry according to claim 1, characterized in that: Through holes are formed in the bottom wall of the support (5), the installation rod (11) and the side wall of the through hole are both mirror surfaces, and the installation rod (11) is inserted into the through hole.

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