Heat exchanger capable of preventing medium blockage

Abstract

The heat exchanger capable of preventing the medium from being blocked comprises a vertically-arranged barrel, a plurality of heat exchange pipes are arranged in the barrel in parallel, a rotational flow device is further arranged in each heat exchange pipe, and each rotational flow device comprises a supporting frame, a rotating shaft arranged in the supporting frame and a plurality of propellers arranged on the rotating shaft. The supporting frame is tightly attached to the inner wall of the heat exchange pipe, the rotating shaft is coaxially and rotatably arranged in the middle of the supporting frame, and the propeller coaxially sleeves the rotating shaft. The propeller is driven to rotate by the aid of pressure and flow velocity of media, the media are stirred by the aid of rotation of the propeller, viscous media are scattered to be fully mixed, adhesion of the media to the inner walls of the heat exchange tubes is avoided, and scaling probability is reduced. The flow of a medium is changed into spiral flow from axial linear flow, the flow speed is increased, meanwhile, laminar flow is changed into turbulent flow, the heat exchange coefficient can be increased, the heat exchange efficiency is enhanced, the heat resistance is reduced, and the heat exchange effect is improved by more than 20%.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a heat exchanger for preventing medium blockage. Background Art

[0002] A heat exchanger is an energy-saving device that realizes heat transfer between materials among two or more fluids at different temperatures. It makes heat transfer from a fluid with a higher temperature to a fluid with a lower temperature, so that the fluid temperature reaches the specified index of the process to meet the needs of process conditions. At the same time, it is also one of the main devices for improving energy utilization efficiency. The heat exchanger industry involves a wide range of industries and has a large number of applications in nearly 30 fields such as petroleum, chemical industry, metallurgy, electric power, ships, central heating, refrigeration and air conditioning, machinery, food, and pharmaceuticals.

[0003] The shell-and-tube heat exchanger is the most commonly used type of heat exchanger. Its principle is that two fluids with different temperatures flow in spaces separated by a wall surface, and heat exchange occurs between the two fluids through the heat conduction of the wall surface and the convection of the fluid on the wall surface. The shell-and-tube heat exchanger mainly includes shell-and-tube heat exchangers and double-pipe heat exchangers.

[0004] At present, heat exchangers are widely used in the chemical industry, and most of them are shell-and-tube heat exchangers. However, in the chemical industry, the media that need to be heat-exchanged are generally mixed media, containing multiple components, and may even be solid-liquid mixtures such as suspensions and emulsions, resulting in a relatively viscous overall state. When cooling in a heat exchanger, when the medium enters the small heat exchange tubes, it is easy to adhere to the inner wall of the heat exchange tubes. After cooling on the outer wall of the heat exchange tubes, the medium will condense and hang on the wall, accumulate to form a hard crust, resulting in an increase in the fouling coefficient of the heat exchanger, a decrease in the heat exchange effect, and in severe cases, blockage of the heat exchange tubes, making them unusable. Moreover, after the heat exchanger is blocked, it needs to be shut down and disassembled as a whole for cleaning, which is a cumbersome process and affects the normal operation of the industrial production process. Therefore, in the industrial production process, in order to avoid frequent blockage of the heat exchanger, a filtering device is often connected to the heat exchanger, which will lead to an increase in equipment cost, an increase in floor area, and an increase in maintenance cost. Therefore, a heat exchanger with a simple structure and capable of preventing blockage is needed. Summary of the Utility Model

[0005] Aiming at the deficiencies in the prior art, the utility model provides a heat exchanger for preventing medium blockage, which solves the problems in the prior art that the heat exchange medium in the chemical industry is easy to accumulate and form a hard crust on the inner wall of the heat exchange tubes, resulting in an increase in the fouling coefficient of the heat exchanger, a decrease in the heat exchange effect, and in severe cases, blockage of the heat exchange tubes.

[0006] According to an embodiment of the present utility model, a heat exchanger for preventing medium blockage includes a vertically arranged cylinder body, with an upper tube box and a lower tube box respectively connected to the upper and lower ends of the cylinder body. Feed ports and discharge ports are respectively connected to the upper tube box and the lower tube box. A number of heat exchange tubes are arranged in parallel inside the cylinder body, and both ends of the heat exchange tubes are communicated with the upper tube box and the lower tube box respectively. A cooling water inlet and a cooling water outlet are respectively arranged at the bottom and top of the side surface of the cylinder body. A swirl device is also arranged inside the heat exchange tubes. The swirl device includes a support frame, a rotating shaft arranged inside the support frame, and a number of propellers arranged on the rotating shaft. The support frame is a vertically arranged cylindrical support structure, and the support frame is arranged closely against the inner wall of the heat exchange tube. The rotating shaft is coaxially and rotatably arranged in the middle of the support frame, and the propellers are coaxially sleeved outside the rotating shaft, so that the rotating shaft and the propellers rotate simultaneously.

[0007] Further, a folded edge part that can be turned outwards is arranged outside the top end of the support frame. The maximum diameter of the folded edge part is larger than the inner diameter of the heat exchange tube, so that the support frame is hung inside the heat exchange tube through the folded edge part.

[0008] Further, a number of radial fixing rods are arranged inside the support frame, and the central position of the fixing rods is rotationally connected to the rotating shaft.

[0009] Further, a blocking head is also arranged at the position of the top end of the rotating shaft close to the inlet of the heat exchange tube. The top of the blocking head protrudes upwards in an arc shape, and the bottom of the blocking head is fixedly connected to the rotating shaft. The maximum diameter of the blocking head is smaller than the inner diameter of the heat exchange tube, so that a space for the medium to pass through is left between the inner wall of the heat exchange tube and the blocking head.

[0010] Further, the support frame is a hollow frame structure, and its interior is completely communicated with the interior of the heat exchange tube.

[0011] Further, a sealing bearing is arranged in the middle of the fixing rod, and the rotating shaft is arranged inside the sealing bearing, so as to be rotationally connected to the fixing rod through the sealing bearing.

[0012] Compared with the prior art, the present utility model has the following beneficial effects:

[0013] 1. The present utility model is provided with a swirl device inside the heat exchange tube. The swirl device includes a support frame, a rotating shaft arranged inside the support frame, and a number of propellers arranged on the rotating shaft. When the fluid medium enters the heat exchange tube, the pressure and flow rate of the medium drive the propellers to rotate. The rotation of the propellers stirs the medium axially in a circular motion, dispersing the viscous state of the medium and making it fully mixed. At the same time, the centrifugal force makes the medium form a circumferential flow and a radial convection on the surface of the inner wall of the heat exchange tube, thereby avoiding the adhesion and hardening of the medium on the inner wall of the heat exchange tube, reducing the probability of scaling, and reducing the number of maintenance times.

[0014] 2. In this utility model, the flow of the medium changes from axial linear flow to spiral flow, increasing the flow distance. With the flux remaining unchanged, the flow velocity increases, and at the same time, laminar flow changes to turbulent flow. Therefore, the heat transfer coefficient can be increased, the heat exchange efficiency can be enhanced, and the thermal resistance can be reduced. After testing, the heat exchange effect is improved by more than 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 It is a schematic diagram of the heat exchange tube and the swirl device in an embodiment of the present utility model.

[0017] In the above-mentioned drawings: 1. Cylinder body; 2. Upper tube sheet; 3. Lower tube sheet; 4. Heat exchange tube; 5. Support frame; 6. Rotating shaft; 7. Propeller; 8. Blocking head; 11. Cooling water inlet; 12. Cooling water outlet; 21. Feed inlet; 31. Discharge outlet; 51. Flanged part; 52. Fixed rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the present utility model will be further described below in conjunction with the drawings and embodiments.

[0019] As Figure 1 shown, an embodiment of the present utility model provides a heat exchanger for preventing medium blockage, including a vertically arranged cylinder body 1. The upper and lower ends of the cylinder body 1 are respectively connected with an upper tube sheet 2 and a lower tube sheet 3. The upper tube sheet 2 and the lower tube sheet 3 are respectively connected with a feed inlet 21 and a discharge outlet 31. A plurality of heat exchange tubes 4 are arranged in parallel in the cylinder body 1. The two ends of the heat exchange tubes 4 are respectively communicated with the upper tube sheet 2 and the lower tube sheet 3. The bottom and the top of the side surface of the cylinder body 1 are respectively provided with a cooling water inlet 11 and a cooling water outlet 12. Among them, the medium to be heat-exchanged enters the upper tube sheet 2 from the feed inlet 21 at the top, and then simultaneously enters a plurality of heat exchange tubes 4 arranged in parallel. After passing through the heat exchange tubes 4 to complete heat exchange, it converges to the lower tube sheet 3 and finally is discharged through the discharge outlet 31. The cooling water inlet 11 and the cooling water outlet 12 are respectively connected to a circulating water pump to continuously supply cooling water or heating water to provide the fluid for heat exchange for the internal heat exchange tubes 4.

[0020] As Figure 2 shown, in this embodiment, a swirl device is further arranged inside the heat exchange tube 4. The swirl device includes a support frame 5, a rotating shaft 6 arranged inside the support frame 5, and a plurality of propellers 7 arranged on the rotating shaft 6. The support frame 5 is a vertically arranged cylindrical support structure, and the support frame 5 is closely arranged against the inner wall of the heat exchange tube 4. The rotating shaft 6 is coaxially and rotatably arranged in the middle of the support frame 5. The propellers 7 are coaxially sleeved outside the rotating shaft 6, so that the rotating shaft 6 and the propellers 7 rotate simultaneously.

[0021] In a specific solution, a number of radial fixing rods 52 are arranged inside the support frame 5, and the central position of the fixing rod 52 is rotatably connected to the rotating shaft 6. At the same time, a sealing bearing is arranged in the middle of the fixing rod 52, and the rotating shaft 6 is arranged inside the sealing bearing, so as to be rotatably connected to the fixing rod 52 through the sealing bearing. Preferably, the support frame 5 is a hollow frame structure, and its interior is completely communicated with the interior of the heat exchange tube 4, so that when the medium passes through the interior of the support frame 5, it can always be in contact with the inner wall of the heat exchange tube 4 to maintain the heat exchange function.

[0022] It should be noted that in this embodiment, a folded edge portion 51 that can be turned outwards is arranged outside the top end of the support frame 5, and the maximum diameter of the folded edge portion 51 is greater than the inner diameter of the heat exchange tube 4, so that the support frame 5 is hung inside the heat exchange tube 4 through the folded edge portion 51. Therefore, inserting the support frame 5 into the interior of the heat exchange tube 4 from the top completes the installation, and no additional fixing device is required, which facilitates the installation and disassembly of the support frame 5 and improves the equipment maintenance efficiency.

[0023] In this embodiment, further, a blocking head 8 is also arranged at a position near the inlet of the heat exchange tube 4 at the top end of the rotating shaft 6. The top of the blocking head 8 protrudes upwards in an arc shape, and the bottom of the blocking head 8 is fixedly connected to the rotating shaft 6. The maximum diameter of the blocking head 8 is smaller than the inner diameter of the heat exchange tube 4, so that a space for the medium to pass through is left between the inner wall of the heat exchange tube 4 and the blocking head 8. Since the blocking head 8 occupies the internal space of the heat exchange tube 4 and reduces the area through which the medium can pass, the flow rate of the medium is increased while keeping the medium flux unchanged, so that it can better drive the rotation of the propeller 7.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A heat exchanger for preventing medium blockage, comprising a vertically arranged cylinder, wherein the upper and lower ends of the cylinder are respectively connected to an upper tube box and a lower tube box, wherein the upper tube box and the lower tube box are respectively connected to a feed port and a discharge port, wherein a plurality of heat exchange tubes are arranged in parallel in the cylinder, wherein the two ends of the heat exchange tubes are respectively connected to the upper tube box and the lower tube box, and a cooling water inlet and a cooling water outlet are respectively arranged at the bottom and the top of the side of the cylinder, wherein the characteristics are: A swirl device is also provided inside the heat exchange tube, and the swirl device includes a support frame, a rotating shaft arranged inside the support frame, and a plurality of propellers arranged on the rotating shaft. The support frame is a vertically arranged cylindrical support structure, and the support frame is arranged close to the inner wall of the heat exchange tube. The rotating shaft is coaxially arranged in the middle of the support frame, and the propeller is coaxially sleeved and installed outside the rotating shaft, so that the rotating shaft and the propeller rotate simultaneously.

2. A heat exchanger for preventing medium clogging according to claim 1, characterized in that: A folded edge portion that can be turned outward is arranged on the outside of the top end of the support frame, and the maximum diameter of the folded edge portion is larger than the inner diameter of the heat exchange tube, so that the support frame is hung in the heat exchange tube through the folded edge portion.

3. A heat exchanger for preventing medium clogging according to claim 1, characterized in that: A plurality of radial fixing rods are arranged inside the support frame, and the center positions of the fixing rods are rotatably connected to the rotating shaft.

4. A heat exchanger for preventing medium clogging according to claim 1, characterized in that: A blocking head is also provided at the top of the rotating shaft near the inlet of the heat exchange tube. The top of the blocking head is curved and protrudes upward, and the bottom of the blocking head is fixedly connected to the rotating shaft. The maximum diameter of the blocking head is smaller than the inner diameter of the heat exchange tube, so that a space for the medium to pass is left between the inner wall of the heat exchange tube and the blocking head.

5. A heat exchanger for preventing medium clogging according to claim 1, characterized in that: The support frame is a hollow frame structure, the interior of which is completely connected with the interior of the heat exchange tube.

6. A heat exchanger for preventing medium clogging according to claim 3, characterized in that: A sealed bearing is arranged in the middle of the fixing rod, and the rotating shaft is arranged inside the sealed bearing, so as to be rotationally connected with the fixing rod through the sealed bearing.

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