A kind of indirect air cooling tower heat exchanger tube anti-abrasion, anti-corrosion lining tube for thermal power plant

Abstract

The present application belongs to the field of fluid dynamics and chemical corrosion technology, and specifically discloses an indirect air cooling tower heat exchanger pipe anti-abrasion and anti-corrosion lining pipe for a thermal power plant, which comprises a lining pipe body, a lining pipe boss at one end of the lining pipe body, a filling area outside the other end of the lining pipe body, and neutral silicone structural adhesive filled in the filling area; an interference fit area is arranged on the outside of the lining pipe body; a fixing mechanism is symmetrically arranged on the upper and lower sides of the lining pipe boss; the lining pipe boss can prevent the lining pipe from being completely embedded in the radiator pipe and protect the radiator pipe head from being cavitated; the neutral silicone structural adhesive filled in the filling area and the interference fit area can double-protect the cavitation area of the radiator pipe and ensure that the medium does not contact the metal; after the lining pipe is nested in the radiator pipe, the clamping block in the fixing mechanism is clamped with the reserved clamping groove on the radiator pipe, so that the connection strength of the lining pipe and the radiator pipe can be further enhanced.

Description

Technical Field

[0001] This invention relates to the fields of fluid dynamics and chemical corrosion technology, specifically to a wear-resistant and corrosion-resistant lining for heat exchanger tubes in an indirect air-cooled tower of a thermal power plant. Background Technology

[0002] Air-cooled radiators are the main component of indirect air-cooled towers. Circulating water is cooled by these radiators, which are mostly vertically arranged outside the tower. The radiators are arranged vertically around the tower's perimeter, with each section having one inlet pipe, one return pipe, and one vent pipe. Each pipe is equipped with an electric butterfly valve for easy switching between different operating conditions. The radiators have an exhaust system, with each section having its own independent exhaust system to ensure smooth exhaust and stable system pressure.

[0003] When air-cooled radiators are used in the field, circulating water enters the lower header of the radiator tube bundle through the sector inlet pipe and the radiator expansion joint. The lower header distributes the circulating water to each radiator tube at the radiator inlet for cooling. Currently, the radiator tube bundles of indirect air-cooled systems in China are made of aluminum alloy. To ensure heat exchange efficiency, the tube wall is designed to be about 1mm thick, and the tube wall is passivated to form a passivation film.

[0004] Pressure changes inevitably occur during the water distribution process between the bottom tube bundle header and the tube bundle radiator tubes. Under high-speed flow and pressure change conditions, cavitation (bubbles) forms in the change area. These cavitation cavitation ruptures in the high-pressure area, generating impact pressure that damages the protective film on the surface of the radiator tubes. The characteristic feature is that many small pits first form on the surface of the radiator tubes, and then gradually expand into cavities, which is a typical cavitation damage. After cavitation, the passivation film on the surface of aluminum alloy radiator tubes is destroyed, which leads to electrochemical corrosion. Under the combined effect of the physical impact of cavitation and electrochemical corrosion, the inner wall of the aluminum alloy tube opening of the radiator is severely damaged, and large-scale damage and leakage will occur in less than a month of use. Therefore, a wear-resistant and corrosion-resistant liner for the tubes of the indirect air-cooled tower heat exchanger in thermal power plants is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a wear-resistant and corrosion-resistant liner for the tubes of an indirect air-cooled tower heat exchanger in a thermal power plant, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wear-resistant and corrosion-resistant liner for heat exchanger tubes in an indirect air-cooled tower of a thermal power plant, comprising a liner body, wherein one end of the liner body is provided with a liner boss, and the other end is provided with a filling area, and the filling area is filled with neutral silicone structural adhesive; an interference fit area is provided on the outer side of the liner body between the liner boss and the filling area; and a fixing mechanism for stabilizing the radiator tubes is symmetrically installed on the upper and lower sides of the liner boss.

[0007] Preferably, the interference amount in the interference fit zone gradually transitions from 0mm to 0.02mm.

[0008] Preferably, the liner body is nested with the radiator tube.

[0009] Preferably, the fixing mechanism includes an L-shaped fixing plate, and the vertical plate of the L-shaped fixing plate is fixedly connected to the liner protrusion; a mounting block is fixedly connected to the side of the L-shaped fixing plate facing the liner protrusion, a guide slide rod is fixedly connected between the two mounting blocks, and two movable plates are slidably sleeved on the guide slide rod. Support rods are symmetrically installed on the opposite sides of the two movable plates, and the end of the support rod away from the movable plate is connected to the same locking block; a spring is provided between the opposite sides of the two movable plates and the mounting block, and the spring is movably sleeved outside the guide slide rod.

[0010] Preferably, both ends of the support rod are rotatably connected to the top of the moving plate and the locking block via a rotating shaft.

[0011] Preferably, a limiting member is provided between the two movable plates below the guide slide rod. The limiting member includes a sleeve and a movable rod slidably disposed in the sleeve. One end of the sleeve is fixedly connected to the movable plate, and the end of the movable rod away from the sleeve is fixedly connected to the other movable plate. A first connecting plate and a second connecting plate are fixedly connected to the bottom of the sleeve and the movable rod, respectively. A screw is fixedly connected to the side of the second connecting plate facing the first connecting plate. The end of the screw away from the second connecting plate moves through the first connecting plate and is fitted with a nut.

[0012] Preferably, the card block engages with a pre-reserved slot on the radiator tube.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention, by setting a liner protrusion, not only prevents the liner from being completely embedded in the radiator tube, but also protects the radiator tube head from cavitation. Furthermore, by filling the filling area with neutral silicone structural adhesive and setting an interference fit area, this invention provides double protection against cavitation in the radiator tube, ensuring that the medium does not come into contact with the metal. After the liner is nested inside the radiator tube, the locking block in the fixing mechanism engages with the pre-reserved slot on the radiator tube through the cooperation of a moving plate, spring, guide slide rod, limiting component, and support rod, further strengthening the connection between the liner and the radiator tube and preventing loosening during use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the assembly structure of the liner and radiator tube of the present invention;

[0017] Figure 3 This is a partially exploded structural diagram of the liner and radiator tube of the present invention.

[0018] Figure 4 This is a schematic diagram of the fixing mechanism of the present invention;

[0019] Figure 5 This is a schematic diagram of the limiting member of the present invention.

[0020] In the diagram: 1. Liner body; 2. Liner boss; 3. Neutral silicone structural adhesive; 4. Interference fit area; 5. Radiator tube; 6. Fixing mechanism; 61. L-shaped fixing plate; 62. Mounting block; 63. Guide slide rod; 64. Moving plate; 65. Support rod; 66. Locking block; 67. Spring; 68. Limiting component; 681. Sleeve; 682. Movable rod; 683. First connecting plate; 684. Second connecting plate; 685. Screw; 686. Nut; 7. Reserved slot. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Please see Figure 1-5This invention provides a technical solution: a wear-resistant and corrosion-resistant liner for heat exchanger tubes in an indirect air-cooled tower of a thermal power plant, comprising a liner body 1, wherein one end of the liner body 1 is provided with a liner boss 2, and the other end is provided with a filling area, and the filling area is filled with neutral silicone structural adhesive 3; an interference fit area 4 is provided on the outer side of the liner body 1 between the liner boss 2 and the filling area; and fixing mechanisms 6 for stabilizing the radiator tubes 5 are symmetrically installed on the upper and lower sides of the liner boss 2.

[0025] Furthermore, the interference amount of the interference fit zone 4 gradually transitions from 0mm to 0.02mm.

[0026] Furthermore, the liner body 1 is nested and connected to the radiator tube 5.

[0027] Furthermore, the fixing mechanism 6 includes an L-shaped fixing plate 61, and the vertical plate of the L-shaped fixing plate 61 is fixedly connected to the liner boss 2; a mounting block 62 is fixedly connected to the side of the L-shaped fixing plate 61 facing the liner boss 2, a guide slide rod 63 is fixedly connected between the two mounting blocks 62, and two movable plates 64 are slidably sleeved on the guide slide rod 63. Support rods 65 are symmetrically installed on the opposite side of the two movable plates 64, and the end of the support rod 65 away from the movable plate 64 is connected to the same locking block 66; a spring 67 is provided between the opposite side of the two movable plates 64 and the mounting block 62, and the spring 67 is movably sleeved on the outside of the guide slide rod 63.

[0028] Furthermore, both ends of the support rod 65 are rotatably connected to the top of the moving plate 64 and the locking block 66 via rotating shafts.

[0029] Furthermore, a limiting member 68 is provided between the two movable plates 64 below the guide slide rod 63. The limiting member 68 includes a sleeve 681 and a movable rod 682 slidably disposed within the sleeve 681. One end of the sleeve 681 is fixedly connected to the movable plate 64, and the end of the movable rod 682 away from the sleeve 681 is fixedly connected to the other movable plate 64. A first connecting plate 683 and a second connecting plate 684 are respectively fixedly connected to the bottom of the sleeve 681 and the movable rod 682. A screw 685 is fixedly connected to the side of the second connecting plate 684 facing the first connecting plate 683. The end of the screw 685 away from the second connecting plate 684 moves through the first connecting plate 683 and is fitted with a nut 686.

[0030] Furthermore, the card block 66 engages with the reserved slot 7 on the radiator tube 5.

[0031] Working principle: During assembly, clean the inner wall of the radiator tube 5 to ensure there are no foreign objects or water. Then, evenly apply neutral silicone structural adhesive 3 to the filling area of ​​the liner. After that, embed the liner into the radiator tube 5. After the interference fit area 4 contacts the radiator tube 5, start tapping the liner with a rubber mallet until the liner boss 2 is in complete contact with the opening of the radiator tube 5. Then, adjust the position of the locking block 66 appropriately so that it corresponds to the reserved locking slot 7. After correspondence, the locking block 66 engages with the reserved locking slot 7 under the elastic force of the spring 67. After engagement, put the nut 686 on the screw 685 and abut against the first connecting plate 683 to fix the movable rod 682 and the sleeve 681 together. This ensures that the two moving plates 64 will not move away from each other, and thus ensures that the locking block 66 will not be pulled out of the reserved locking slot 7. This further strengthens the connection strength between the liner and the radiator tube 5 and prevents the radiator tube 5 from loosening during use.

[0032] By setting the liner boss 2, this invention can not only prevent the liner from being completely embedded in the radiator tube 5, but also protect the head of the radiator tube 5 from cavitation. In this invention, by filling the filling area with neutral silicone structural adhesive 3 and setting the interference fit area 4, the cavitation area of ​​the radiator tube 5 can be doubly protected, ensuring that the medium does not come into contact with the metal, and thus making it less likely for the radiator to undergo electrochemical corrosion.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant and corrosion-resistant liner for the tubes of an indirect air-cooled tower heat exchanger in a thermal power plant, characterized in that, The liner body (1) is provided with a liner boss (2) at one end and a filling area at the other end, and the filling area is filled with neutral silicone structural adhesive (3); an interference fit area (4) is provided on the outer side of the liner body (1) between the liner boss (2) and the filling area; and a fixing mechanism (6) for stabilizing the radiator tube (5) is symmetrically installed on the upper and lower sides of the liner boss (2). The fixing mechanism (6) includes an L-shaped fixing plate (61), and the vertical plate of the L-shaped fixing plate (61) is fixedly connected to the liner boss (2); the L-shaped fixing plate (61) is fixedly connected to the side facing the liner boss (2) with a mounting block (62), and a guide slide rod (63) is fixedly connected between the two mounting blocks (62), and two movable plates (64) are slidably sleeved on the guide slide rod (63). Support rods (65) are symmetrically installed on the opposite side of the two movable plates (64), and the end of the support rod (65) away from the movable plate (64) is connected to the same locking block (66); a spring (67) is provided between the side of the two movable plates (64) away from each other and the mounting block (62), and the spring (67) is movably sleeved on the outside of the guide slide rod (63); Both ends of the support rod (65) are rotatably connected to the top of the moving plate (64) and the locking block (66) via rotating shafts; A limiting member (68) is provided between the two movable plates (64) below the guide slide rod (63). The limiting member (68) includes a sleeve (681) and a movable rod (682) slidably disposed in the sleeve (681). One end of the sleeve (681) is fixedly connected to the movable plate (64), and the end of the movable rod (682) away from the sleeve (681) is fixedly connected to the other movable plate (64). A first connecting plate (683) and a second connecting plate (684) are fixedly connected to the bottom of the sleeve (681) and the movable rod (682), respectively. A screw (685) is fixedly connected to the side of the second connecting plate (684) facing the first connecting plate (683). The end of the screw (685) away from the second connecting plate (684) moves through the first connecting plate (683) and is fitted with a nut (686).

2. The wear-resistant and corrosion-resistant lining tube for an indirect air-cooled tower heat exchanger in a thermal power plant according to claim 1, characterized in that: The interference amount of the interference fit zone (4) gradually transitions from 0mm to 0.02mm.

3. The wear-resistant and corrosion-resistant lining tube for an indirect air-cooled tower heat exchanger in a thermal power plant according to claim 1, characterized in that: The liner body (1) is nested and connected to the radiator tube (5).

4. The wear-resistant and corrosion-resistant lining tube for an indirect air-cooled tower heat exchanger in a thermal power plant according to claim 1, characterized in that: The card block (66) engages with the reserved slot (7) on the radiator tube (5).

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