Connecting and sealing structure for intercooling tower heat exchanger of steam turbine
By arranging annular seals between the connecting plates of the inter-turbine cooling tower heat exchanger, the water leakage problem caused by the failure of the sealing ring in high temperature environment is solved, achieving higher sealing performance and stable operation.
Patent Information
- Application Number
- CN202420869252.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-04-24
AI Technical Summary
The sealing ring of the intercooling tower heat exchanger of the turbine is prone to failure in high temperature environments, resulting in water leakage, especially in winter, which is prone to freezing and cracking of the pipeline, resulting in large workload and long recovery time, which affects the operation of the unit.
A connection sealing structure is designed, which includes two connecting plates spaced apart in the vertical direction. An annular first sealing member is provided between the two connecting plates, and the sealing joint is located in the first sealing member. By firmly connecting the two plates, a layer of sealing is added to prevent leakage.
It effectively improves the sealing performance and prevents water leakage, especially in winter to prevent the cooling water from freezing and cracking, ensuring the stable operation of the steam turbine unit.
Smart Images
Figure CN222378901U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of sealing of a heat exchanger for a steam turbine intercooler in a power plant, and in particular to a connection sealing structure for a heat exchanger for a steam turbine intercooler. Background Art
[0002] At present, the intercooling tower of the steam turbine in a large power station is designed with several cooling triangle heat exchangers, which are arranged vertically on the outer side of the lower part of the air-cooling tower cylinder. In the height direction, each heat exchanger is divided into 2 to 4 sections, and the sections are connected by flanges (integrated with the tube sheet). The upper water inlet heat exchange tube and the lower water inlet heat exchange tube, the upper water return heat exchange tube and the lower water return heat exchange tube are sealed at the joints. In the related art, the sealing ring at the middle joint of the water inlet pipe and the water return pipe is easy to cause the sealing ring between the upper water inlet pipe and the lower water inlet pipe, and the upper water return pipe and the lower water return pipe to fail due to the relatively high working environment temperature, thereby causing water leakage. Especially in winter, after water leakage, it is easy to freeze and crack the pipeline. In this way, once a leak occurs, the entire cooler sector where the leaking pipe is located must be stopped for pipe plugging, which is a large workload and a long recovery time, affecting the operation and production of the unit. Utility Model Content
[0003] The purpose of the present disclosure is to provide a connection sealing structure for a steam turbine intercooler heat exchanger, which can improve the sealing performance to at least partially solve the problems in the related art.
[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a connection sealing structure for a turbine intercooler heat exchanger, comprising: two connecting plates arranged at intervals in the vertical direction and fixedly connected to each other, a sealing joint for connecting a heat exchange tube group arranged on the connecting plates is provided between the two connecting plates, an annular first sealing member is provided on the outer periphery of the sealing joint and between the two connecting plates, and the sealing joint is located inside the first sealing member.
[0005] Optionally, at least one of the two connecting plates is provided with a first mounting groove for accommodating the first sealing member.
[0006] Optionally, a minimum distance between the first mounting groove and the heat exchange tube group is not less than 20 mm.
[0007] Optionally, the connecting plate includes a first connecting plate and a second connecting plate, the heat exchange tube group includes a first water inlet pipe and a first water return pipe arranged on the first connecting plate, and a second water inlet pipe and a second water return pipe arranged on the second connecting plate, and the first water inlet pipe and the second water return pipe are respectively connected through the sealing joint.
[0008] Optionally, a second seal is provided between the first connecting plate and the second connecting plate and inside the first seal, and the second seal divides the sealing area enclosed by the first seal into a first sealing area and a second sealing area, the sealing joints used to connect the first water inlet pipe and the second water inlet pipe are both located in the first sealing area, and the sealing joints used to connect the first water return pipe and the second water return pipe are both located in the second sealing area.
[0009] Optionally, at least one of the first connecting plate and the second connecting plate is provided with a second mounting groove for accommodating the second sealing member.
[0010] Optionally, a minimum distance between an edge of the second mounting groove and any one of the first water inlet pipe, the first water return pipe, the second water inlet pipe and the second water return pipe is not less than 20 mm.
[0011] Optionally, a plurality of mounting holes are provided on outer edges of the first connecting plate and the second connecting plate, and fasteners pass through the mounting holes to fix the first connecting plate and the second connecting plate in connection.
[0012] Optionally, the plurality of mounting holes are arranged at equal intervals along an outer edge of the first connecting plate.
[0013] Optionally, the minimum distance between the mounting hole and the first mounting groove is not less than 20 mm.
[0014] Through the above technical scheme, an annular first seal is arranged between the two connecting plates and on the outer contour edges of the two connecting plates, and the sealing joint of the heat exchange tube group connected to the connecting plates is located in the first seal. Therefore, when the two connecting plates are fixedly connected, an additional layer of sealing can be added by the first seal on the basis of the original sealing joint. Therefore, when the sealing joint in the heat exchange tube group fails, it can be sealed by the first seal to prevent the turbine intercooler heat exchanger from leaking, especially in winter when the pipeline is easily frozen and cracked after leakage, thereby enabling the turbine unit to operate stably.
[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0017] Figure 1 is a schematic diagram of a top view of a first connecting plate in a connecting and sealing structure provided in an exemplary embodiment of the present disclosure;
[0018] Figure 2 yes Figure 1 Schematic diagram of partial section view of section AA;
[0019] Figure 3 It is a partial schematic diagram of the assembly structure of the first water inlet pipe, the second water inlet pipe and the sealing joint in the connection sealing structure provided in the exemplary embodiment of the present disclosure.
[0020] Description of Reference Numerals
[0021] 1-connecting plate; 11-first connecting plate; 12-second connecting plate; 13-mounting hole; 2-heat exchange tube group; 21-first water inlet pipe; 22-first water return pipe; 23-second water inlet pipe; 3-sealing joint; 4-first sealing member; 5-first mounting groove; 6-second sealing member; 7-first sealing area; 8-second sealing area; 9-second mounting groove. DETAILED DESCRIPTION
[0022] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0023] In the present disclosure, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the use state of the connection structure. Figure 1 The terms "first", "second", etc. are used to distinguish one element from another element and do not have order or importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.
[0024] In the related art, a large-scale power station steam turbine intercooler has a plurality of cooling triangle heat exchangers, which are arranged vertically on the outer side of the lower part of the air-cooling tower cylinder, and are cylindrical in shape as a whole. In the height direction, each heat exchanger is divided into 2-4 sections, and the sections are connected by flanges. The flange is integrated with the tube sheet, and the upper water inlet pipe and the lower water inlet pipe, the upper water return pipe and the lower water return pipe are respectively inserted into the corresponding openings of the upper tube sheet and the lower tube sheet and are welded and fixed to the upper tube sheet and the lower tube sheet. There is no seal between the tube sheets and there is a certain gap. If When the sealing structure at the connection between the upper water inlet pipe and the lower water inlet pipe and the connection between the upper water return pipe and the lower water return pipe fails, water leakage occurs between the upper water inlet pipe and the lower water inlet pipe, and between the upper water return pipe and the lower water return pipe. The leaked cooling water leaks out from the gap between the upper tube plate and the lower tube plate, which is prone to freezing and cracking the leaking pipe in winter. Once water leakage occurs between the upper water inlet pipe and the lower water inlet pipe, and between the upper water return pipe and the lower water return pipe, the entire cooler sector where the leaking pipe is located must be shut down for pipe plugging, which requires a large workload and a long recovery time, which has a great impact on the economic efficiency of the unit operation.
[0025] like Figure 1-Figure 3 As shown, the present disclosure provides a connection sealing structure for a steam turbine intercooler heat exchanger, comprising: a connection plate 1, a heat exchange tube group 2, a sealing joint 3 and a first sealing member 4, wherein there are two connection plates 1, namely a first connection plate 11 and a second connection plate 12, the first connection plate 11 and the second connection plate 12 are arranged at intervals in the vertical direction and fixedly connected to each other, the first connection plate 11 is located above the second connection plate 12 in the vertical direction, the heat exchange tube group 2 may include a first water inlet pipe 21 and a first water return pipe 22 arranged on the first connection plate 11, and a second water inlet pipe 23 and a second water return pipe 24 arranged on the second connection plate 12. The first water inlet pipe 21, the first water return pipe 22, the second water inlet pipe 23 and the second water return pipe can be welded to the corresponding first connecting plate 11 and the second connecting plate 12. The first water inlet pipe 21 and the second water inlet pipe 23, and the first water return pipe 22 and the second water return pipe are respectively connected by a sealing joint 3. An annular first sealing member 4 is provided on the periphery of all the sealing joints 3 and between the first connecting plate 11 and the second connecting plate 12. All the sealing joints 3 are located inside the first sealing member 4. The outer contour of the first connecting plate 11 and the second connecting plate 12 can be a rectangular plate. The first sealing member 4 also adopts a rectangular ring to adapt to the connecting plate 1.
[0026] Through the above technical scheme, an annular first seal 4 is arranged between the first connecting plate 11 and the second connecting plate 12 and between the first connecting plate 11 and the second connecting plate 12, and all the sealing joints 3 are located in the first seal 4, so that when the first connecting plate 11 and the second connecting plate 12 are fixedly connected, an additional layer of sealing can be added by the first seal 4 on the basis of the original sealing joint 3, so that when the sealing joint 3 fails, it can be sealed by the first seal 4 to prevent the turbine intercooler heat exchanger from leaking, especially in winter when the pipeline is easily frozen and cracked after leakage, so that the turbine unit can operate stably.
[0027] In order to facilitate the installation of the first seal 4 between the two connecting plates 1, in some feasible embodiments, at least one of the two connecting plates 1 is provided with a first installation groove 5 for accommodating the first seal 4. For example, the first installation groove 5 is provided on the first connecting plate 11 and the second connecting plate 12. When the first seal 4 is installed, it can be first placed in the sealing groove 5 of the second connecting plate 12 below. The sealing groove 5 of the first connecting plate 11 and the sealing groove 5 of the second connecting plate 12 are aligned and fixedly connected, so that the first seal 4 can be completely placed in the first installation groove 5 set in the first connecting plate 11 and the second connecting plate 12. In this way, the first connecting plate 11, the second connecting plate 12 and the first seal 4 together form a sealing area. When the sealing joint 3 fails, the cooling water can be effectively blocked, thereby preventing the turbine intercooler heat exchanger from leaking, especially in winter when the pipeline is easily frozen and cracked after leakage, thereby enabling the turbine unit to operate stably.
[0028] It can be understood that the structure in which the first mounting groove 5 is provided on both the first connecting plate 11 and the second connecting plate 12 is schematic. In other embodiments, the first mounting groove 5 can also be provided only on the second connecting plate 12. In this way, when installing the first seal 4, the first seal 4 can be placed in the first mounting groove 5, and the first connecting plate 11 and the second connecting plate 12 are fixedly connected so that the first connecting plate 11, the second connecting plate 12 and the first seal 4 together form a sealing area. When the sealing joint 3 fails, the cooling water can be effectively blocked.
[0029] In some practicable embodiments, the minimum distance between the first mounting groove 5 and the heat exchange tube group 2 is not less than 20 mm. For example, the first mounting groove 5 is provided on both the first connecting plate 11 and the second connecting plate 12, and the heat exchange tube group 2 may include a first water inlet pipe 21 and a first water return pipe 22 provided on the first connecting plate 11, and a second water inlet pipe 23 and a second water return pipe provided on the second connecting plate 12, and the number of the first water inlet pipe 21, the first water return pipe 22, the second water inlet pipe 23 and the second water return pipe is multiple, and the first water inlet pipe 21 and the second water inlet pipe 23, the first water return pipe 22 and the second water return pipe are all provided in a one-to-one correspondence, and the inner side edge of the first mounting groove 5 provided on the first connecting plate 11 is aligned with the first water inlet pipe 21 and the first water return pipe 22. 1 and the first water return pipe 22 have a minimum distance of not less than 20 mm. Similarly, the minimum distance between the inner edge of the first mounting groove 5 located on the second connecting plate 12 and the plurality of second water inlet pipes 23 and the second water return pipe is not less than 20 mm. In this way, it can be ensured that after the first sealing member 4 is installed in the first mounting groove 5, there is a sufficient distance that it is not affected by the temperatures of the first water inlet pipe 21, the first water return pipe 22, the second water inlet pipe 23 and the second water return pipe and is closer to the ambient temperature, thereby improving the service life of the first sealing member 4 and avoiding the first sealing member 4 from aging and failing due to the working temperature of the first sealing member 4 being too high.
[0030] It is understandable that the first sealing member 4 can be made of a corrosion-resistant and aging-resistant rubber material, wherein the elastic modulus of the first sealing member 4 satisfies the following formula:
[0031]
[0032] Wherein, K is the elastic modulus of the first seal, N / mm; P is the working pressure of the circulating water at the sealing joint of the heat exchange tube of the triangular heat exchanger of the intercooling tower, Pa; S is the cross-sectional area of the entire circle of the first installation groove, m 2 ; ΔH is the compression deformation of the first seal, which is equal to the height of the first seal minus the depth of the upper and lower first mounting grooves and the distance between the first connecting plate 11 and the second connecting plate 12; 1.25 is the pressure safety factor.
[0033] In some specific embodiments, to facilitate the placement of the first seal 4, the depth of the first mounting groove 5 is 9.5 mm - 10.5 mm, preferably, the depth of the first mounting groove 5 is 10 mm; the width of the first mounting groove 5 is 14 mm - 16 mm, preferably, the width of the first mounting groove 5 is 15.2 mm; the free height of the first seal 4 is 24 mm and the width is 15 mm.
[0034] To further improve the sealing performance of the connection sealing structure for the intermediate cooling tower heat exchanger of the steam turbine, in some feasible embodiments, a second seal 6 is further provided between the first connecting plate 11 and the second connecting plate 12 and within the first seal 4. The second seal 6 divides the sealing area surrounded by the first seal 4 into a first sealing area 7 and a second sealing area 8. The sealing joints 3 for connecting the first water inlet pipe 21 and the second water inlet pipe 23 are all located in the first sealing area 7, and the sealing joints 3 for connecting the first water return pipe 22 and the second water return pipe are all located in the second sealing area 8. The second seal 6 is made of the same material as the first seal 4, has the same width as the first seal 4, and the free height is 24.4 mm plus the distance between the first connecting plate 11 and the second connecting plate after installation. The second seal 6 is strip-shaped and located on the center line in the length direction of the first seal 4. The two ends of the second seal 6 are fixedly connected to the first seal 4. Of course, the second seal 6 can also be integrally formed with the first seal 4. The first seal 4 and the second seal 6 together form a "day" shape. By dividing the sealing area formed by the first seal 4, the first connecting plate 11 and the second connecting plate 12 through the second seal 6, a first sealing area 7 for accommodating the sealing joints 3 of the first water inlet pipe 21 and the second water inlet pipe 23 is formed, and a second sealing area 8 for accommodating the sealing joints 3 of the first water return pipe 22 and the second water return pipe is formed. In this way, the sealing joints 3 of the first water inlet pipe 21 and the second water inlet pipe 23 and the sealing joints 3 of the first water return pipe 22 and the second water return pipe can be separately sealed through the first sealing area 7 and the second sealing area 8, avoiding the leakage of the sealing joints 3 of the first water inlet pipe 21 and the second water inlet pipe 23 flowing to the leakage sealing joints 3 of the first water return pipe 22 and the second water return pipe and forming a leakage loop.
[0035] It can be understood that the above-mentioned strip shape of the second seal 6 is illustrative. In other embodiments, the second seal 6 can be of any other shape, as long as the second seal 6 can form a first sealing area 7 for accommodating the sealing joints 3 of the first water inlet pipe 21 and the second water inlet pipe 23, and a second sealing area 8 for accommodating the sealing joints 3 of the first water return pipe 22 and the second water return pipe.
[0036] In order to facilitate the installation of the second seal 6 between the two connecting plates 1, at least one of the first connecting plate 11 and the second connecting plate 12 is provided with a second installation groove 9 for accommodating the second seal 6, and its depth and width are the same as those of the first installation groove 5. For example, the first connecting plate 11 and the second connecting plate 12 are both provided with a second installation groove 9. When the second seal 6 is installed, the first seal 4 is first placed in the first installation groove 5 below, and the second seal 6 is also first placed in the second installation groove 9 below. The first installation groove 5 and the second installation groove 9 in the first connecting plate 11 and the second connecting plate 12 are respectively aligned and fixedly connected, so that the first seal 4 can be completely placed in the first installation groove 5 provided in the first connecting plate 11 and the second connecting plate 12, and the second seal 6 can be completely placed in the second installation groove 9 provided in the first connecting plate 11 and the second connecting plate 12. In this way, the first connecting plate 11, the second connecting plate 12, the first seal 4 and the second seal 6 respectively form a first sealing area 7 of the sealing joint 3 for accommodating the first water inlet pipe 21 and the second water inlet pipe 23, and form a sealing area for The second sealing area 8 that accommodates the sealing joint 3 of the first return water pipe 22 and the second return water pipe, when the sealing joint 3 of the first water inlet pipe 21 and the second water inlet pipe 23 fails, the cooling water can be effectively sealed through the first sealing area 7 to prevent the cooling water leaking from the water inlet pipe from flowing to the leaking sealing joint of the return water pipe to form a leakage loop, and at the same time prevent the steam turbine intercooler heat exchanger from leaking, especially in winter when the pipe is easily frozen and cracked after leakage, thereby enabling the steam turbine unit to operate stably. Of course, when the sealing joint 3 of the first return water pipe 22 and the second return water pipe fails, the cooling water can be effectively sealed through the second sealing area 8 to prevent the cooling water in the return water pipe from affecting the water inlet pipe, and at the same time prevent the steam turbine intercooler heat exchanger from leaking, especially in winter when the pipe is easily frozen and cracked after leakage, thereby enabling the steam turbine unit to operate stably.
[0037] In some feasible embodiments, the minimum distance between the edge of the second installation groove 9 and any one of the first water inlet pipe 21, the first water return pipe 22, the second water inlet pipe 23 and the second water return pipe is not less than 15 mm, thereby ensuring that after the second seal 6 is installed in the second installation groove 9, there is a sufficient distance not to be affected by the temperature of the first water inlet pipe 21, the first water return pipe 22, the second water inlet pipe 23 and the second water return pipe and to be closer to the ambient temperature, thereby improving the life of the second seal 6 and avoiding the second seal 6 from operating at too high a temperature, which may cause aging and failure of the first seal 4.
[0038] In addition, in order to facilitate the fixed connection between the first connecting plate 11 and the second connecting plate 12, in some practicable embodiments, a plurality of mounting holes 13 are provided on the outer edges of the first connecting plate 11 and the second connecting plate 12, and fasteners pass through the mounting holes 13 to fix the first connecting plate 11 and the second connecting plate 12 in connection. The number of mounting holes 13 can be multiple and they are arranged at intervals along the edge of the outer contour of the first connecting plate 11 and the second connecting plate 12. The fasteners can be bolts, for example, which pass through the mounting holes 13 corresponding to the first connecting plate 11 and the second connecting plate 12 and are locked by locking nuts to fix the first connecting plate 11 and the second connecting plate 12 in connection. In order to facilitate the stable connection and uniform force of the first connecting plate 11 and the second connecting plate 12, in some practicable embodiments, the mounting holes 13 on the first connecting plate 11 and the mounting holes 13 on the second connecting plate 12 are arranged one by one, and the plurality of mounting holes 13 are arranged at equal intervals along the outer edges of the first connecting plate 11 and the second connecting plate 12.
[0039] In some feasible embodiments, in order to ensure that the first seal 4 in the first mounting groove 5 has sufficient clamping force, the minimum distance between the mounting hole 13 and the first mounting groove 5 is not less than 20 mm. Preferably, the minimum distance between the mounting hole 13 and the first mounting groove 5 is 20 mm, so that when the fastener passes through the mounting hole 13, the first seal 4 can be as close to the fastener as possible, so that the first seal 4 has sufficient clamping force.
[0040] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0042] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A connection sealing structure for a steam turbine intercooler heat exchanger, characterized in that: include: Two connecting plates are arranged at intervals in the vertical direction and fixedly connected to each other, a sealing joint for connecting a heat exchange tube group arranged on the connecting plates is provided between the two connecting plates, an annular first sealing member is provided on the outer periphery of the sealing joint and between the two connecting plates, and the sealing joint is located inside the first sealing member.
2. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 1, characterized in that: At least one of the two connecting plates is provided with a first mounting groove for accommodating the first sealing member.
3. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 2, characterized in that: The minimum distance between the first mounting groove and the heat exchange tube group is not less than 20 mm.
4. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 2 or 3, characterized in that: The connecting plate includes a first connecting plate and a second connecting plate, the heat exchange tube group includes a first water inlet pipe and a first water return pipe arranged on the first connecting plate, and a second water inlet pipe and a second water return pipe arranged on the second connecting plate, and the first water inlet pipe and the second water return pipe are respectively connected through the sealing joint.
5. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 4, characterized in that: A second seal is also provided between the first connecting plate and the second connecting plate and inside the first seal. The second seal divides the sealing area enclosed by the first seal into a first sealing area and a second sealing area. The sealing joints used to connect the first water inlet pipe and the second water inlet pipe are both located in the first sealing area, and the sealing joints used to connect the first water return pipe and the second water return pipe are both located in the second sealing area.
6. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 5, characterized in that: A second mounting groove for accommodating the second sealing member is provided in at least one of the first connecting plate and the second connecting plate.
7. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 6, characterized in that: The minimum distance between the edge of the second installation groove and any one of the first water inlet pipe, the first water return pipe, the second water inlet pipe and the second water return pipe is not less than 15 mm.
8. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 7, characterized in that: A plurality of mounting holes are provided on the outer edges of the first connecting plate and the second connecting plate, and fasteners pass through the mounting holes to fix the first connecting plate and the second connecting plate in connection.
9. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 8, characterized in that: The plurality of mounting holes are arranged at equal intervals along the outer edge of the first connecting plate.
10. The connection sealing structure for a steam turbine intercooler heat exchanger according to claim 9, characterized in that: The minimum distance between the mounting hole and the first mounting groove is not less than 20 mm.