Boiler superheater tube

Abstract

The utility model relates to a boiler superheater tube which comprises a supporting lantern ring assembly arranged at the end of the superheater tube. The support collar assembly includes a collar body and a plurality of support assemblies. The supporting assembly is arranged in the groove hole in the ring body in a matched mode and comprises a supporting block, an arch-shaped plate and a cover plate. The supporting blocks are arranged at inner end openings of the slotted holes and can move relative to the ring body, first arc-shaped concave faces capable of being in contact fit with the ends of the superheater tube are formed on the outer end faces, and studs sleeved with springs are arranged on the inner end faces. A shoulder portion is formed on the stud, and the spring is brought into contact with an end face of the shoulder portion. The cover plate is fixed at the outer port of the slotted hole, the arched plate is arranged between the supporting block and the cover plate, and the arched plate, the supporting block and the cover plate are connected together through the stud. The supporting block can promote the arch-shaped plate to generate elastic deformation, and acting force is exerted on the supporting block. The vibration strength of the end of the superheater tube can be favorably controlled through the supporting lantern ring assembly, and the situation that the end of the superheater tube is broken can be effectively restrained.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler superheater pipe with a cover body. BACKGROUND

[0002] In the boiler, the superheater (also called steam superheater) is an important high-temperature component, which is generally installed at the outlet position on the furnace chamber. Its function is to heat the saturated steam extracted from the steam drum to a higher superheated temperature under constant pressure to meet the needs of production processes. The superheater pipe arranged in the superheater absorbs heat. The superheater pipe is made of a seamless boiler steel pipe or a heat-resistant alloy steel pipe bent into a serpentine shape, and the two ends are welded to the inlet and outlet headers, respectively. Because high-pressure steam flows in the superheater pipe during operation, and the outside is constantly subjected to the impact of high-temperature flue gas, the pipe may vibrate, causing the superheater pipe to break at the welded joint at the connection end. The failure rate of the boiler superheater during operation is relatively high. SUMMARY

[0003] To overcome the problem that the superheater pipe of the boiler is prone to breakage at the connection end, the utility model provides a boiler superheater pipe, which is provided with a support ring assembly at both ends of the superheater pipe. The vibration intensity of the end portion of the superheater pipe is controlled by the support ring assembly, which can effectively prevent the superheater pipe from breaking at the end portion.

[0004] The utility model solves the technical problem by adopting the following technical scheme: a boiler superheater pipe, comprising a support ring assembly arranged at the end portion of the superheater pipe. The support ring assembly comprises a ring body and a plurality of support assemblies mounted on the ring body. A plurality of profiled groove holes are arranged on the ring body and uniformly distributed around the circumference. The support assemblies are matched with the profiled groove holes one by one.

[0005] The support assembly comprises a support block, an arched plate, and a cover plate.

[0006] The support block is arranged at the inner end of the profiled groove hole and can reciprocate along the radial direction relative to the ring body. An arc-shaped concave surface one is formed on the outer end surface of the support block. When the end portion of the superheater pipe is sleeved in the ring body, the arc-shaped concave surface one can contact the outer peripheral surface of the end portion of the superheater pipe. A threaded stud is formed on the inner end surface of the support block, and a spring is sleeved on the threaded stud. An axial shoulder portion is formed at the middle portion of the threaded stud, and one end of the spring contacts the end surface of the axial shoulder portion.

[0007] The concave side of the arched plate faces the support block, and the two ends can contact the inner end surface of the support block. A first through hole is formed on the arched plate for the threaded stud to pass through.

[0008] The cover plate is fixed at the outer port of the type groove hole, and a second through hole is formed on the cover plate for the threaded stud to pass through.

[0009] After the threaded stud passes through the first through hole and the second through hole, a nut is arranged at the free end of the threaded stud, and the other end of the spring is in contact with the concave side plate surface of the arc-shaped plate. At this time, the inner end surface of the cover plate is in contact with the arc-shaped convex surface of the arc-shaped plate, and the arc-shaped plate can be elastically deformed by being pushed and pressed, so that the pushing force can be applied to the supporting block to facilitate the contact between the arc-shaped concave surface and the outer circumferential surface of the end portion of the superheater tube. The outer end of the supporting block can be kept in a state of extending into the inner cavity of the ring body.

[0010] Optionally, a first inclined surface corresponding to the two end portions of the arc-shaped plate is formed at the edge of the inner end surface of the supporting block. End arms are respectively formed at the two end portions of the arc-shaped plate, and a second inclined surface corresponding to the first inclined surface is formed on the end arm. In the initial state, the second inclined surface is relatively close to the inner end side of the first inclined surface, and when the arc-shaped plate is elastically deformed and the two end portions thereof slide relative to the inner end surface of the supporting block, the second inclined surface can keep in contact with the first inclined surface and can slide relative to the first inclined surface.

[0011] Optionally, side plates are respectively formed at the two end portions of the arc-shaped plate, and the extension direction of the side plate is consistent with the axial direction of the threaded stud. Two end arms are respectively arranged at the free ends of the two side plates. An elastic deformation part is formed at the joint position of the side plate and the end arm.

[0012] Optionally, an arc-shaped concave surface two is formed on the cover plate and on the end surface of the cover plate facing the arc-shaped plate. The arc-shaped convex surface and the arc-shaped concave surface two correspond to each other, and the top of the arc-shaped convex surface can keep in contact with the arc-shaped concave surface two.

[0013] Optionally, a reinforcing rib is formed on the cover plate and on the end surface of the cover plate away from the arc-shaped plate.

[0014] Optionally, the number of type groove holes distributed on the ring body is 6-12.

[0015] Optionally, in order to facilitate the multiple supporting blocks to keep in good contact with the end portion of the superheater tube, multiple convex ribs are distributed and formed on the arc-shaped concave surface one, and the convex ribs extend along the arc-shaped extension direction of the arc-shaped concave surface one.

[0016] The utility model discloses a supporting sleeve ring assembly for the superheater tube of a boiler, which is detachably installed on the wall of the inlet and outlet headers, and corresponds to the welding position. The supporting sleeve ring assembly can control the vibration intensity, i.e. vibration frequency and amplitude, of the end portion of the superheater tube, effectively protect the welding connection position on the superheater tube, and effectively prevent the superheater tube from being broken at the end portion. Therefore, the failure rate of the superheater of the boiler during operation is reduced. Attached Figure Description

[0017] Figure 1 A schematic diagram of the radial cross-sectional structure of the supporting collar assembly.

[0018] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0019] Figure 3 A schematic diagram of the split structure supporting the assembly.

[0020] Figure 4 A side view of the supporting collar assembly.

[0021] Figure 5 A schematic diagram of the structure for matching the support collar assembly with the end of the superheater tube.

[0022] In the figure: 10 Superheater tube end; 20 Ring body, 21 Type slot, 211 Inner side, 212 Sink; 30 Support block, 31 Arc concave surface one, 32 First inclined surface, 33 Stud, 331 Spring, 332 Nut, 34 Outer side; 40 Arched plate, 41 End arm, 411 Second inclined surface, 42 Side plate, 43 Elastic deformation part, 44 Arc convex surface, 45 First through hole; 50 Cover plate, 51 Arc concave surface two, 52 Second through hole, 53 Edge plate, 531 Bolt, 54 Reinforcing rib. Detailed Implementation

[0023] The structures, proportions, and sizes shown in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0024] like Figures 1 to 5 The boiler superheater tube shown includes a support collar assembly disposed on the end 10 of the superheater tube (i.e., a section of the tube near the two ends of the superheater tube that are welded to the inlet and outlet headers respectively).

[0025] The support ring assembly comprises a ring body 20 and a plurality of support assemblies installed on the ring body 20. One end of the ring body 20 is fixedly connected to the wall of the inlet and outlet header by a bolt assembly.

[0026] A plurality of profiled groove holes 21 are arranged on the ring body 20 and are uniformly distributed in the circumferential direction. The support assemblies are matched with the profiled groove holes 21 one by one. A flange is formed on the ring body 20 at one end thereof facing the wall of the inlet and outlet header, and the ring body 20 is fixed to the inlet and outlet header by the flange. The two free end portions of the superheater tube / overheating tube (i.e., the superheater tube end portion 10 shown in the figure) respectively pass through the shaft cavities of the ring body 20 in the corresponding matched support ring assemblies, and are then welded to the inlet and outlet header. At this time, the ring body 20 corresponds to a section of the tube body near the free end of the superheater tube.

[0027] The support assembly comprises a support block 30, an arched plate 40 and a cover plate 50.

[0028] The support block 30 is arranged at the inner port of the profiled groove hole 21 and can reciprocate along the radial direction relative to the ring body 20. See Figure 2 A profiled port is formed at the inner port side of the profiled groove hole 21, and the inner side surface 211 of the profiled port is a plane. Correspondingly, the outer side surface 34 of the support block 30 is also a plane. After the support block 30 is installed at the inner port position of the profiled groove hole 21, the inner side surface 211 and the outer side surface 34 are in contact and matched, and can constrain the linear reciprocating movement of the support block 30 along the radial direction relative to the ring body 20 or the profiled groove hole 21.

[0029] An arc-shaped concave surface one 31 is formed on the outer end surface of the support block 30. When the superheater tube end portion 10 is sleeved in the ring body 20, the arc-shaped concave surface one 31 can be in contact with the outer peripheral surface of the superheater tube end portion 10. The arc-shaped concave surfaces one 31 on the plurality of support blocks 30 distributed on the same ring body 20 can be substantially distributed on the same cylindrical surface, so that the outer peripheral surface of the superheater tube end portion 10 can be in contact with the arc-shaped concave surfaces one 31 on each support block 30 at the same time. See Figure 5 .

[0030] A threaded stud 33 is formed on the inner end face of the support block 30, and a spring 331 is sleeved on the threaded stud 33. Specifically, a shoulder portion is formed at the axial middle portion of the threaded stud 33, and one end of the spring 331 is in contact with the end face of the shoulder portion. A threaded stud body in the spring 331 is formed as an external threaded surface of the threaded stud 33. After a nut 332 is arranged on the threaded stud 33, screwing the nut 332 can cause the spring 331 to be elastically deformed. The support block 30 is a long strip-shaped plate, and the thickness of the support block 30 in the axial direction of the ring body 20 is small, which can be preferably controlled to be 5 mm to 20 mm, and generally does not exceed 40 mm at most, but the selection of the thickness value here should not be understood as a limitation on the technical solutions of the present application. Figure 1 The thickness of the support block 30 in the axial direction of the ring body 20 is small, which can be preferably controlled to be 5 mm to 20 mm, and generally does not exceed 40 mm at most, but the selection of the thickness value here should not be understood as a limitation on the technical solutions of the present application.

[0031] The concave side of the arched plate 40 faces the support block 30, and the two end portions of the arched plate 40 can be in contact with the inner end face of the support block 30. A first through hole 45 is formed on the arched plate 40, through which the free end portion of the threaded stud 33 passes.

[0032] The cover plate 50 is fixed at the outer port of the profile groove hole 21, and a second through hole 52 is formed on the cover plate 50, through which the free end portion of the threaded stud 33 passes. Specifically, as shown in Figure 2 A recessed groove portion 212 is formed on the outer port side of the profile groove hole 21, the cover plate 50 is placed in the recessed groove portion 212, and a bolt set is arranged on the two side edge plates 53 of the cover plate 50. The cover plate 50 is fixed on the ring body 20 by each bolt 531 in the bolt set.

[0033] After the threaded stud 33 passes through the first through hole 45 and the second through hole 52, the nut 332 is arranged at the free end of the threaded stud 33, and screwing the nut 332 causes the other end of the spring 331 to be in contact with the concave side plate face of the arched plate 40. At this time, the inner end face of the cover plate 50 is in contact with the arc-shaped convex face 44 of the arched plate 40, and after the cover plate 50 is tightly fixed on the ring body 20, the cover plate 50 can elastically deform the arched plate 40 (during which the two end portions of the arched plate 40 can slide relative to the inner end face of the support block 30 and remain in contact), and can exert a pushing force on the support block 30 to cause the arc-shaped concave face 31 to be in close contact with the outer peripheral face of the superheater tube end portion 10.

[0034] The outer end of the support block 30 can be kept in a state of extending in the inner cavity of the ring body 20. In order to facilitate the multiple support blocks 30 to be in good contact with the superheater tube end 10 at the same time, multiple convex ribs (not shown in the figure) are formed on the arc-shaped concave surface 31 and extend along the arc direction of the arc-shaped concave surface 31.

[0035] As shown in the figure, the inner end face edge of the support block 30 (i.e. the two end sides of the support block 30 consistent with the length direction of the arched plate 40) is formed with a first inclined surface 32 corresponding to the two end portions of the arched plate 40 respectively. Figures 1 to 4

[0036] The two end portions of the arched plate 40 are respectively formed with an end arm 41, and the end arm 41 is formed with a second inclined surface 411 capable of being in contact with the first inclined surface 32. In the initial state, the second inclined surface 411 is preferably close to the inner end side of the first inclined surface 32, so as to provide sufficient stroke space for the relative sliding action of the two inclined surfaces. When the arched plate 40 is elastically deformed and the two end portions thereof slide relative to the inner end face of the support block 30, the second inclined surface 411 can be in contact with the first inclined surface 32 and can slide relative to the first inclined surface 32.

[0037] In order to facilitate the movement of the second inclined surface 411 relative to the first inclined surface 32, the two inclined surfaces can be kept in a state of sufficient contact, i.e. there is a large enough contact surface to consume vibration energy (by friction).

[0038] The two end portions of the arched plate 40 are respectively formed with a side plate 42, and the extension direction of the side plate 42 is consistent with the axial direction of the stud 33 (or the extension direction of the inner side face 211). The two end arms 41 are respectively arranged at the free ends of the two side plates 42, and the elastic deformation portion 43 is formed at the position where the side plate 42 and the end arm 41 are connected. When the arched plate 40 is elastically deformed and the two ends thereof slide relative to the support block 30, the elastic deformation portion 43 can be elastically deformed, so as to facilitate the second inclined surface 411 on the end arm 41 to be in sufficient contact with the first inclined surface 32.

[0039] ​In the technical solution of the present application, the support block 30, the arched plate 40 and the cover plate 50 are connected together by means of the stud 33, and the position of the support block 30 relative to the cover plate 50 can be adjusted by adjusting the nut 332, that is, the initial deformation state of the arched plate 40 is adjusted. The axial extension length of the external threaded surface section provided on the stud 33 needs to be long enough to sufficiently adjust the (initial) relative position state between the support block 30 and the arched plate 40, and to control the radial length of the support block 30 extending into the inner cavity of the ring body 20. When the superheater tube / superheated tube generates vibration, the vibration is conducted to the support block 30 at the superheater tube end portion 10, and can cause the support block 30 to move / jump relative to the ring body 20, causing the arched plate 40 to elastically deform, thereby dissipating the vibration energy and weakening / relieving the vibration intensity of the superheater tube end portion 10, which helps to protect the welded position between the superheater tube end portion 10 and the inlet and outlet headers, effectively protects the welded connection position on the superheater tube, and effectively suppresses the occurrence of the superheater tube breaking at its end portion, thereby reducing the failure rate of the boiler superheater during operation.

[0040] By configuring the first inclined surface 32 and the second inclined surface 411, the friction action of the relative sliding of the two inclined surfaces can dissipate vibration energy, which can improve the energy dissipation effect, further weaken the vibration intensity of the superheater tube end portion 10, and better protect the welded position at the end portion of the heat exchange tube.

[0041] Arc-shaped concave surfaces two 51 are formed on the cover plate 50 and on the end surface of the cover plate 50 facing the arched plate 40. The arc-shaped convex surface 44 and the arc-shaped concave surface two 51 correspond and match, and the top of the arc-shaped convex surface 44 can be in contact with the arc-shaped concave surface two 51.

[0042] Stiffening ribs 54 are distributed and formed on the end surface of the cover plate 50 away from the arched plate 40. After arranging the stiffening ribs 54, the stiffness of the cover plate 50 can be better guaranteed, the thickness of the plate body of the cover plate 50 can be reduced, and the cover plate 50 can be more conveniently fixed and installed at the port of the profile groove hole 21 of the ring body 20.

[0043] The above-mentioned embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. The present application can be improved in many aspects without departing from the general idea, and the above-mentioned embodiments can be modified or changed by those skilled in the art without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A boiler superheater tube characterized by: The application relates to a support ring assembly arranged on the end part (10) of a superheater tube, which comprises a ring body (20) and a plurality of support assemblies arranged on the ring body (20). The ring body (20) is provided with a plurality of groove holes (21) which are uniformly distributed around the circumferential direction and correspond to the support assemblies one by one. The support assembly comprises a support block (30), an arched plate (40) and a cover plate (50). The support block (30) is arranged at the inner end of the groove hole (21) and can move along the radial direction relative to the ring body (20). An arc-shaped concave surface I (31) is formed on the outer end surface of the support block (30), and when the end part (10) of the superheater tube is sleeved in the ring body (20), the arc-shaped concave surface I (31) can be in contact with the outer circumferential surface of the end part (10) of the superheater tube; a stud (33) is formed on the inner end surface of the support block (30), and a spring (331) is sleeved on the stud (33); a shaft shoulder part is formed in the middle part of the stud (33), and one end of the spring (331) is in contact with the end surface of the shaft shoulder part. The concave side of the arched plate (40) faces the support block (30), and the two end parts can be in contact with the inner end surface of the support block (30); a first through hole (45) is formed on the arched plate (40). The cover plate (50) is fixed at the outer end of the groove hole (21), and a second through hole (52) is formed on the cover plate (50). After the stud (33) passes through the first through hole (45) and the second through hole (52), a nut (332) is arranged at the free end of the stud (33), so that the other end of the spring (331) is in contact with the concave side of the arched plate (40); the cover plate (50) is in contact with the arc-shaped convex surface (44) of the arched plate (40), so that the arched plate (40) is elastically deformed and an acting force is applied on the support block (30).

2. The boiler superheater tube of claim 1, wherein: First inclined surfaces (32) which can correspond to the two end parts of the arched plate (40) respectively are formed on the inner end surface of the support block (30); end arms (41) are respectively formed on the two end parts of the arched plate (40), and second inclined surfaces (411) which can be in contact with the first inclined surfaces (32) are formed on the end arms (41); when the arched plate (40) is elastically deformed, the second inclined surfaces (411) can be in contact with the first inclined surfaces (32) and can slide relative to the first inclined surfaces (32).

3. The boiler superheater tube of claim 2, wherein: Side plates (42) are respectively formed on the two end parts of the arched plate (40), and the extension directions of the side plates (42) are consistent with the axial directions of the studs (33); the two end arms (41) are respectively arranged at the free ends of the two side plates (42); and elastic deformation parts (43) are formed at the positions where the side plates (42) and the end arms (41) are connected.

4. The boiler superheater tube of any one of claims 1 to 3, wherein: An arc-shaped concave surface II (51) is formed on the end surface of the cover plate (50) which faces the arched plate (40); the arc-shaped convex surface (44) corresponds to the arc-shaped concave surface II (51), and the top of the arc-shaped convex surface (44) can be in contact with the arc-shaped concave surface II (51).

5. The boiler superheater tube of any one of claims 1 to 3, wherein: A reinforcing rib (54) is formed on the end surface of the cover plate (50) which faces away from the arched plate (40).

6. The boiler superheater tube of claim 1, wherein: The number of the groove holes (21) arranged on the ring body (20) is 6-12.

7. The boiler superheater tube of claim 1, wherein: The plurality of convex ribs are distributed on the arc-shaped concave surface (31) and extend along the arc-shaped direction of the arc-shaped concave surface (31).

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