Anti-impact shock-resistant vibration support structure for high-pressure heater serpentine heat exchange tube bundle and high-pressure heater

Abstract

The utility model relates to an anti-impact shock -proof vibration support structure for high pressure heater serpentine heat exchange tube bundle, including the water inlet header and water outlet header at both ends, the heat exchange tube bundle that is connected between the water inlet header and water outlet header and is serpentine bending, the heat exchange tube bundle is arranged by a large number of heat exchange tubes and is formed in the form of multilayer, multiple columns, and the part that the heat exchange tube bundle both ends are connected with water inlet header, water outlet header is connecting portion, the part that the heat exchange tube bundle middle is serpentine bending is main part, and the multiple sets of fixed support unit are arranged on the main part in the length direction of high pressure heater dispersedly, and at least a set of elastic support unit is arranged on the main part between the adjacent two sets of fixed support unit. Utilize fixed support unit restriction and eliminate heat exchange tube bundle whole body vibration, keep the even spacing between pipe, utilize elastic support unit to maintain the beneficial vibration of heat exchange tube simultaneously, eliminate the condensate film on heat exchange tube, ensure heat exchange tube heat exchange efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of components for general heat exchange or heat transfer equipment, specifically relating to an impact-resistant and vibration-damping support structure for a serpentine heat exchange tube bundle of a high-pressure heater and a high-pressure heater. Background Technology

[0002] Traditional high-pressure heaters (HPAs) use U-tube designs, which have large tube sheet thicknesses and pose significant risks when used in single-row configurations. These designs are no longer suitable for the demands of modern high-parameter, large-scale generating units and are no longer used in single-row arrangements of large units abroad. They are generally used in power plant generator sets below 600 MW. Currently, domestic units above 1 MW generally use serpentine tube designs, which offer advantages such as no thick tube sheet, no thick water chamber, good temperature adaptability, no parameter constraints, and breakthroughs in large-scale production. They are the preferred choice for advanced large units abroad and are the standard configuration for today's double reheat and 700℃ high-end units, significantly simplifying generator set reliability.

[0003] The serpentine tube type high-pressure heater has a relatively long single heat exchange tube, generally over 15 meters, and the overall tube bundle is a serpentine elastic tube bundle (such as...). Figure 1 The entire tube bundle is subjected to high-temperature, high-pressure steam (300-500℃, 2.5-12MPa) on its outer side, while high-temperature, high-pressure water (500℃, 40MPa) circulates inside the bundle. If the overall constraint of the tube bundle is insufficient, noise and surging will occur under the steam impact. Combined with the effect of the circulating water inside the tubes, the tube bundle will vibrate. Although the vibration of the tube bundle can break the condensate film on its surface to ensure heat exchange efficiency, excessive vibration will cause the outer walls of the heat exchange tubes to rub against each other, resulting in corrosion. The local constraint points connecting to the serpentine heat exchange tubes will vibrate and shear the serpentine heat exchange tubes, thus causing the serpentine heat exchange tubes to leak and fail.

[0004] To address the above problems, existing technology CN 106643265 A discloses a heat exchange tube support device for a serpentine tube header type high-pressure heater. This device supports each layer of heat exchange tubes and fixes both ends of the support members to the cladding to improve the constraint of the heat exchange tubes and reduce inter-tube friction. However, in practical applications, this structure has insufficient support strength, and the heat exchange tubes on both sides are still prone to collapse downwards, causing deformation of the cladding and resulting in uneven gas flow between tubes, thus reducing heat exchange efficiency. In addition, as a steam-covered structure, the cladding is subject to steam impact and thermal stress damage. According to previous high-pressure heater failure cases, the cladding itself is a weak point for tube bundle failure. If more support units are added and the spacing between the support units is shortened, the beneficial vibration of the heat exchange tubes will be reduced, and overall resonance of the heat exchange tube bundle will be formed, seriously threatening the safety of the high-pressure heater. Utility Model Content

[0005] The primary technical problem to be solved by this invention is to provide an impact-resistant and vibration-damping support structure for the serpentine heat exchange tube bundle of a high-pressure heater, thereby addressing the technical issues of insufficient support strength and the tendency for the traditional support structure to cause overall resonance of the tube bundle.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an impact-resistant and vibration-damping support structure for a serpentine heat exchanger tube bundle of a high-pressure heater, including an inlet manifold and an outlet manifold located at both ends, and a heat exchanger tube bundle connected between the inlet manifold and the outlet manifold and forming a serpentine bend. The heat exchanger tube bundle is composed of a large number of heat exchanger tubes arranged in a multi-layer, multi-row manner. The parts at both ends of the heat exchanger tube bundle that are connected to the inlet manifold and the outlet manifold respectively are the connecting parts. The serpentine bend in the middle of the heat exchanger tube bundle is the main body. Multiple sets of fixed support units are discretely arranged on the main body along the length direction of the high-pressure heater. At least one set of elastic support units is provided on the main body between two adjacent sets of fixed support units.

[0007] The fixed support unit includes fixed support bodies arranged on both sides of the main body and facing each other, and fixed support plates arranged below each layer of heat exchange tubes. The fixed support plates are solid structures, and both ends of the fixed support plates are fixedly connected to the fixed support bodies. The fixed support plates are provided with arc-shaped grooves on the surface facing the heat exchange tubes, which are corresponding to the heat exchange tubes and engage with them one by one. The inner diameter of the grooves is adapted to the outer diameter of the corresponding heat exchange tubes. Each fixed support body is vertically connected to the support base.

[0008] The elastic support unit includes a high-temperature resistant elastic spacer set between any two adjacent heat exchange tubes. The high-temperature resistant elastic spacer has radial elastic extensibility. Support grooves corresponding to the heat exchange tubes above and below the high-temperature resistant elastic spacer are respectively set on both sides. The heat exchange tubes above and below the high-temperature resistant elastic spacer are correspondingly engaged in the support grooves.

[0009] As a preferred embodiment, the fixed support is a support column surrounding the heat exchange tube bundle.

[0010] As a preferred embodiment, the high-temperature resistant elastic spacer is formed by two metal plates joined together. Each plate has multiple V-shaped bends evenly distributed along its length. A support groove is formed between two adjacent V-shaped bends to accommodate and support a heat exchange tube. The elastic deformation of the V-shaped bends allows the plates to elastically extend along their length. The two plates are joined together with their V-shaped openings facing each other.

[0011] As a preferred embodiment, the tips of several opposing V-shaped bends of two adjacent high-temperature resistant elastic spacers are connected to each other by a connecting plate.

[0012] As a preferred embodiment, the main body is bent in a serpentine manner to form multiple straight pipe sections extending along the length direction of the high-pressure heater and multiple bent sections connecting the straight pipe sections. Multiple fixed supports are provided on both sides of any straight pipe section, and each straight pipe section is provided with a fixed support plate. The two ends of the fixed support plate are fixedly connected to the fixed supports on both sides of the straight pipe section to which it is located.

[0013] As a preferred option, each fixed support is vertically connected to a support base, which has a hollow structure.

[0014] As a preferred embodiment, a pad is provided between each two adjacent heat exchange tubes extending along the width direction of the high-pressure heater in the main body. The two ends of each pad extend radially along the heat exchange tube bundle to the two sides of the heat exchange tube bundle and are then bent vertically toward the adjacent pad and fixedly welded to the adjacent pad. The pad is in the shape of a strip. A pad is also provided between each two adjacent heat exchange tubes in the connecting part. The two ends of the pad are bent toward the adjacent pad and then welded to the adjacent pad.

[0015] The technical problem to be solved by this utility model is to provide a high-pressure heater that solves the problem that the support structure of the heat exchange tube bundle inside the traditional high-pressure heater is not strong enough and is prone to overall resonance of the tube bundle.

[0016] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a high-pressure heater, including a shell, and the shell is provided with the above-mentioned impact-resistant and vibration-damping support structure for the serpentine heat exchange tube bundle of the high-pressure heater.

[0017] The beneficial effects of this utility model are as follows: This utility model uses fixed supports fixedly connected to a support base on both sides of the straight pipe section of the heat exchanger tube bundle body. Then, a solid fixed support plate is used to support and radially position each layer of heat exchanger tubes in the heat exchanger tube bundle. This effectively improves the support for each layer of heat exchanger tubes, limits the vibration transmission of heat exchanger tubes at the fixed support unit position, eliminates overall vibration of the heat exchanger tube bundle, and maintains balanced spacing between tubes. Simultaneously, elastic support units are used between the fixed support units to limit the vibration of the heat exchanger tubes between the fixed support units and ensure that there is no friction or collision between the heat exchanger tubes, maintaining beneficial vibration of the heat exchanger tubes between the fixed support units, eliminating condensate film on the heat exchanger tubes, and ensuring heat exchange efficiency. The technical solution adopted by this utility model not only improves the overall stability of the heat exchanger tube bundle and eliminates the risk of overall vibration of the heat exchanger tube bundle, but also maintains effective vibration of individual heat exchanger tubes, ensuring that no condensate film forms on the surface of the heat exchanger tubes, thus ensuring heat exchange efficiency.

[0018] The high-pressure heater described in this utility model achieves the technical effects of more stable operation, higher heat exchange efficiency, and longer service life by adopting the above-mentioned impact-resistant and vibration-damping support structure for the serpentine heat exchange tube bundle of the high-pressure heater. Attached Figure Description

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the arrangement structure of the heat exchange tube bundle described in Example 1; Figure 2 yes Figure 1 AA section view in the middle; Figure 3 yes Figure 1 BB section view in the middle; Figure 4 This is a schematic diagram of the high-temperature resistant elastic spacer described in Example 1; Figure 5 This is a schematic diagram of the connection structure between the bent section heat exchange tube and the pad as described in Example 1; Figure 6 This is a schematic diagram of the high-pressure heater described in Example 2; Figures 1-6 1. Inlet water header; 2. Outlet water header; 3. Heat exchange tube bundle; 3a. Connecting part; 3b. Main body; 3c. Straight pipe section; 3d. Bending section; 301. Heat exchange tube; 4. Fixed support unit; 401. Fixed support body; 402. Fixed support plate; 403. Groove; 404. Support base; 5. Elastic support unit; 501. High temperature resistant elastic spacer; 501a. Plate; 501b. V-shaped bend; 502. Support groove; 6. Connecting plate; 7. Pad; 100. Impact-resistant and vibration-damping support structure for serpentine heat exchange tube bundle of high pressure heater; 200. Shell. Detailed Implementation

[0020] The specific implementation scheme of this utility model will now be described in detail with reference to the accompanying drawings. Example 1

[0021] like Figure 1 The shock-resistant and vibration-damping support structure for the serpentine heat exchanger tube bundle of the high-pressure heater shown includes an inlet manifold 1 and an outlet manifold 2 located at both ends, and a heat exchanger tube bundle 3 connected between the inlet manifold 1 and the outlet manifold 2 in a serpentine shape. The heat exchanger tube bundle 3 is composed of a large number of heat exchanger tubes 301 arranged in a multi-layer, multi-row manner. The part at both ends of the heat exchanger tube bundle 3 that is connected to the inlet manifold 1 and the outlet manifold 2 respectively is the connecting part 3a, and the serpentine part in the middle of the heat exchanger tube bundle 3 is the main body part 3b. The main body part 3b is characterized by having multiple sets of fixed support units 4 arranged discretely along the length direction of the high-pressure heater, and at least one set of elastic support unit 5 provided on the main body part 3b between two adjacent sets of fixed support units 4.

[0022] like Figure 2As shown, the fixed support unit 4 includes fixed support bodies 401 disposed on both sides of the main body 3b and facing each other, and fixed support plates 402 disposed below each layer of heat exchange tubes 301. The fixed support plates 402 are solid structures, and both ends of the fixed support plates 402 are fixedly connected to the fixed support bodies 401. The surface of the fixed support plates 402 facing the heat exchange tubes 301 is provided with arc-shaped grooves 403 that correspond one-to-one with the heat exchange tubes 301. The inner diameter of the grooves 403 is adapted to the outer diameter of the corresponding heat exchange tubes 301. Each fixed support body 401 is vertically connected to the support base 404. The support base 404 has a hollow structure to facilitate drainage.

[0023] To facilitate assembly and positioning, it is preferable to provide vertically extending slots on the surface where the fixed support 401 connects to the fixed support plate 402. The two ends of the fixed support plate 402 are respectively engaged in the slots for positioning before welding.

[0024] The fixed support plate 402 used in this embodiment is made of high-strength steel, which has the characteristics of high strength, high elastic modulus and high thermal conductivity. It can provide reliable support and vibration limitation for the heat exchange tube 301, cut off the vibration transmission of the heat exchange tube bundle 3 on both sides of the fixed support unit 4, and eliminate the overall vibration problem of the heat exchange tube bundle 3.

[0025] In this embodiment, the fixed support 401 is preferably a support column on the periphery of the heat exchange tube bundle 3. The support column can be made of channel steel or square tube in practical applications.

[0026] like Figure 3 As shown, the elastic support unit 5 includes a high-temperature resistant elastic spacer 501 disposed between any two adjacent heat exchange tubes 301. The high-temperature resistant elastic spacer 501 is radially elastically extensible along the heat exchange tubes 301. Support grooves 502 are respectively provided on both sides of the high-temperature resistant elastic spacer 501, corresponding one-to-one with the heat exchange tubes 301 above and below it. The heat exchange tubes 301 adjacent to the high-temperature resistant elastic spacer 501 above and below it are correspondingly engaged within the support grooves 502. For ease of understanding, Figure 3 One heat exchange tube 301 is omitted.

[0027] The high-temperature resistant elastic spacer 501 can isolate each heat exchange tube 301, and at the same time enable the heat exchange tube 301 to have the ability to vibrate within a limited radial range, so that the heat exchange tube 301 can break the condensate film on the surface through vibration, thus ensuring heat exchange efficiency.

[0028] like Figure 4As shown, the high-temperature resistant elastic spacer 501 is formed by joining two metal plates 501a. Each plate 501a has multiple V-shaped bends 501b evenly distributed along its length. A support groove 502 is formed between two adjacent V-shaped bends 501b to accommodate and support a heat exchange tube 301. The elastic deformation of the V-shaped bends 501b allows the plates 501a to elastically extend along their length, giving the heat exchange tube 301 embedded in the support groove 502 a certain range of vibration. The two plates 501a are joined together with their V-shaped openings facing each other and welded or riveted at their contact points.

[0029] like Figure 3 As shown, in this embodiment, the tips of several opposing V-shaped bends 501b of two adjacent high-temperature resistant elastic spacers 501 are preferably connected to each other by a connecting plate 6. The connecting plate 6 is preferably arranged at equal intervals along the length of the high-temperature resistant elastic spacer 501, with at least two heat exchange tubes 301 between adjacent connecting plates 6, and the upper and lower connecting plates 6 are preferably staggered.

[0030] The connecting plate 6 increases the interconnection between the upper and lower high-temperature elastic spacers 501 to improve the overall integrity of the elastic support unit 5 and the stability of the relative positions of each high-temperature elastic spacer 501.

[0031] like Figure 1 As shown, the main body 3b is bent in a serpentine manner to form multiple straight pipe sections 3c extending along the length direction of the high-pressure heater, and multiple bent sections 3d connecting each straight pipe section 3c. Multiple fixed supports 401 are provided on both sides of any straight pipe section 3c, and each straight pipe section 3c is provided with a fixed support plate 402. The two ends of the fixed support plate 402 are fixedly connected to the fixed supports 401 on both sides of the straight pipe section 3c to which it is located.

[0032] Combination Figure 1 and Figure 5 As shown, a pad 7 is provided between each two adjacent heat exchange tubes 301 in the bending section 3d extending along the width direction of the high-pressure heater in the main body 3b. The two ends of each pad 7 extend radially along the heat exchange tube bundle 3 to the two sides of the heat exchange tube bundle 3 and then bend vertically toward the adjacent pad 7 and are fixedly welded to the adjacent pad 7. The pad 7 is in the shape of a strip. A pad 7 is also provided between each two adjacent heat exchange tubes 301 in the connecting part 3a. The two ends of the pad 7 are bent toward the adjacent pad 7 and then welded to the adjacent pad 7.

[0033] The pad 7 is used to maintain the steam flow path between each layer of heat exchange tubes 301, without restricting the axial extension of the straight tube section 3c of the heat exchange tube.

[0034] The working process of this embodiment is as follows: First, a support base 404 is set up, then a fixed support body 401 is connected to the support base 404, and a bottom fixed support plate 402 is connected between the fixed support bodies 401. A layer of heat exchange tube 301 is installed on the fixed support plate 402, and then another layer of fixed support plate 402 is installed. At the same time, a layer of high-temperature resistant elastic spacer is installed. Then another layer of heat exchange tube 301 is installed. This process is repeated to assemble the heat exchange tube 301 layer by layer from bottom to top. Finally, a pressure plate 8 is set above the top heat exchange tube 301 and pressed onto the top heat exchange tube 301. The two ends of the pressure plate 8 are fixedly connected to the fixed support body 401. Example 2

[0035] This embodiment provides a high-pressure heater, including a housing 200, and the housing 200 is provided with an impact-resistant and vibration-damping support structure 100 for the serpentine heat exchange tube bundle of the high-pressure heater as described in Embodiment 1 above.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some examples of its application, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.

Claims

1. An impact-resistant and vibration-damping support structure for a serpentine heat exchanger bundle in a high-pressure heater, comprising an inlet manifold (1) and an outlet manifold (2) located at both ends, and a serpentine heat exchanger bundle (3) connected between the inlet manifold (1) and the outlet manifold (2), wherein the heat exchanger bundle (3) is composed of a large number of heat exchanger tubes (301) arranged in multiple layers and multiple rows, the portions at both ends of the heat exchanger bundle (3) connected to the inlet manifold (1) and the outlet manifold (2) respectively are connecting portions (3a), and the serpentine portion in the middle of the heat exchanger bundle (3) is the main body portion (3b), characterized in that, Multiple sets of fixed support units (4) are discretely arranged on the main body (3b) along the length direction of the high-pressure heater, and at least one set of elastic support unit (5) is provided on the main body (3b) between two adjacent sets of fixed support units (4). The fixed support unit (4) includes fixed support bodies (401) arranged on both sides of the main body (3b) and facing each other, and fixed support plates (402) arranged below each heat exchange tube (301). The fixed support plates (402) are solid structures. The two ends of the fixed support plates (402) are fixedly connected to the fixed support bodies (401). The surface of the fixed support plates (402) facing the heat exchange tubes (301) is provided with inferior arc-shaped grooves (403) that correspond to and engage with the heat exchange tubes (301). The inner diameter of the grooves (403) is adapted to the outer diameter of the corresponding heat exchange tubes (301). Each fixed support body (401) is vertically connected to the support base (404). The elastic support unit (5) includes a high-temperature resistant elastic spacer (501) disposed between any two adjacent heat exchange tubes (301). The high-temperature resistant elastic spacer (501) has radial elastic extensibility. Support grooves (502) corresponding to the heat exchange tubes (301) above and below the high-temperature resistant elastic spacer (501) are respectively provided on both sides. The heat exchange tubes (301) above and below the high-temperature resistant elastic spacer (501) are correspondingly snapped into the support grooves (502).

2. The impact-resistant and vibration-damping support structure for the serpentine heat exchanger tube bundle of a high-pressure heater according to claim 1, characterized in that, The fixed support (401) is a support column on the periphery of the heat exchange tube bundle (3).

3. The impact-resistant and vibration-damping support structure for the serpentine heat exchanger tube bundle of a high-pressure heater according to claim 1, characterized in that, The high-temperature resistant elastic spacer (501) is formed by two metal plates (501a) joined together. Any plate (501a) has multiple V-shaped bends (501b) evenly distributed along its length direction. A support groove (502) is formed between two adjacent V-shaped bends (501b) to accommodate and support a heat exchange tube (301). The elastic deformation of the V-shaped bends (501b) allows the plate (501a) to elastically extend along its length direction. The two plates (501a) are joined together in a V-shaped opening facing each other.

4. The impact-resistant and vibration-damping support structure for the serpentine heat exchanger tube bundle of a high-pressure heater according to claim 1, characterized in that, The tips of several opposing V-shaped bends (501b) of two adjacent high-temperature resistant elastic spacers (501) are connected to each other by a connecting plate (6).

5. The impact-resistant and vibration-damping support structure for the serpentine heat exchanger tube bundle of a high-pressure heater according to claim 2, characterized in that, The main body (3b) is bent in a serpentine manner to form multiple straight pipe sections (3c) extending along the length direction of the high-pressure heater and multiple bent sections (3d) connecting each straight pipe section (3c). Multiple fixed supports (401) are provided on both sides of any straight pipe section (3c), and each straight pipe section (3c) is provided with a fixed support plate (402). The two ends of the fixed support plate (402) are fixedly connected to the fixed supports (401) on both sides of the straight pipe section (3c) to which it is located.

6. The impact-resistant and vibration-damping support structure for the serpentine heat exchanger tube bundle of a high-pressure heater according to claim 5, characterized in that, The support base (404) has a hollow structure.

7. The impact-resistant and vibration-damping support structure for the serpentine heat exchanger tube bundle of a high-pressure heater according to any one of claims 1 to 6, characterized in that, A pad (7) is provided between each two adjacent heat exchange tubes (301) extending along the width direction of the high-pressure heater in the main body (3b). The two ends of each pad (7) extend radially along the heat exchange tube bundle (3) to the two sides of the heat exchange tube bundle (3) and then bend vertically toward the adjacent pad (7) and are fixedly welded to the adjacent pad (7). The pad (7) is in the shape of a strip. A pad (7) is also provided between each two adjacent heat exchange tubes (301) in the connecting part (3a). The two ends of the pad (7) are bent toward the adjacent pad (7) and then welded to the adjacent pad (7).

8. A high-pressure heater, comprising a housing (200), characterized in that, The housing (200) is provided with an impact-resistant and vibration-damping support structure (100) for the serpentine heat exchange tube bundle of the high-pressure heater as described in any of claims 1 to 6.

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