JPH08568Y2 - Support device for superheater tube element - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a superheater pipe used for boiler equipment, etc.
A superheater that can extend the life of the superheater by eliminating the damage caused in the fixing metal fittings for fixing the superheater pipes to each other by welding and the joints with the fixing metal fittings of the superheater pipes due to the stress generated by the temperature difference. The present invention relates to a support device for a pipe element.

[Prior Art] Generally, in a boiler 1 as shown in FIG. 8, in order to superheat saturated steam generated in a boiler furnace 2 to produce superheated steam, a loop pipe 5 is steamed in a rear heat transfer section 3. A superheater 4 which is a pipe is provided.

The superheater tube element in the superheater 4 is as shown in FIG.

That is, in the superheater pipe element 6 in which the horizontal loop pipes 5 are vertically arranged in a zigzag shape and the bent portion 5a from the upper loop pipe 5 to the lower loop pipe 5 is formed in a U shape, In the vicinity of the U-shaped open portion 7 of 5, fixing metal fittings 8 are welded to fix the upper and lower loop tubes 5,
It has a panel shape.

In the superheater tube element 6 as described above, the support fittings 9 are welded to both sides of the lowermost loop tube 5,
The superheater tube element 6 is the inner wall of the rear heat transfer section 3 of the boiler 1.
It is adapted to be engaged with and supported by a hook-shaped support fitting 10 projecting from 3a.

[Problems to be Solved by the Invention] However, in the above-described superheater tube element 6, since there is a temperature difference in the vertical direction in each horizontal tube portion that constitutes the tube group in the vertical direction, Although there is a difference in expansion in the axial direction of the pipe due to thermal expansion, the horizontal pipe parts are fixed to each other by the fixing metal fittings 8 and the expansion is restricted, so that the stress caused by the temperature difference (thermal stress) is caused. Since the horizontal pipe portion is frequently damaged at the joint with the fixing metal fitting 8 and the fixing metal fitting 8 and the like, maintenance and inspection must be frequently performed, which requires manpower and is uneconomical.

Further, in the superheater tube element 6, when the fluid for heating the superheater tube element 6 or the internal fluid of the superheater tube element 6 serves as a vibration source to cause vibration, each horizontal tube portion Since they are fixed to each other by the fixing metal fittings 8, the vibration cannot be attenuated, and the vibration must be taken into consideration.

In view of the above situation, the present invention can eliminate the damage to the connecting portion of the superheater pipe with the fixing fitting and the fixing fitting due to the stress generated by the temperature difference, and also to the fluid for heating the superheater pipe element or the superheating pipe element. It is an object of the present invention to provide a support device for a superheater tube element, which can also reduce the vibration generated by the internal fluid of the tube element.

[Means for Solving the Problems] The first superheater tube element support device of the present invention is required in the axial direction of the upper loop tube in the vicinity of the open portion, on the surface facing the lower loop tube. A hook member having an L-shaped cross section, which is an engaging member, is provided at one of the two positions with a space of 1), and the tip of the hook portion of the hook member is located between the upper loop pipe and the lower loop pipe. The hook member having an L-shaped cross section, which is an engaging member, is fixed to one of the two facing surfaces of the upper loop tube, and the arrangement of the hook member is opposite to the left-right direction. And the tip of the hook is fixed so as to be located between the upper loop pipe and the lower loop pipe, a required distance in the axial direction of the tube surface facing the upper loop pipe of the lower loop pipe. Each of the hooks has a hook member having an L-shaped cross section, which is a supporting member, fixed to the upper loop tube at two positions. It is characterized in that the hook portion and the hook portion of the material are engaged with each other with an appropriate gap and are fixed so as to support the lower portion of the upper loop tube, and the overheating of the second invention of the present invention. A support device for an instrument tube element includes a support member for mounting and supporting an upper loop pipe immediately above the lower loop pipe on the lower loop pipe in the vicinity of the open portion, and the support member. The vibration damping member is fitted in the vicinity of the open portion so that the upper loop tube is placed and supported and is covered from the outside.

[Operation] Horizontal loop pipes are arranged in a zigzag shape in the vertical direction, a bent portion from the upper loop pipe to the lower loop pipe is formed in a U shape, and an open portion is formed at an end portion of the loop pipe opposite to the U shape. In the superheater tube element in which the above is formed, the upper loop tube is supported with an appropriate gap so that only the lower loop tube immediately below can move relatively in the tube axial direction. , Even if there is a difference in expansion in the tube axis direction due to a temperature difference, it is not absorbed by the mutual movement in the tube axis direction and thermal stress is not generated, and the fluid that heats the superheater tube element or the internal fluid of the superheater tube element is The vibration generated by the vibration source can be attenuated, and in the first invention, the supporting member and the hook member which is the engaging member have a simple structure having an L-shaped cross section. Since all the hook members have the same shape, Since the hook member can be manufactured easily and in a short time, and the welded portion of each hook member is only one side of the fixed portion to the loop pipe, the welding range is significantly reduced. Attachment work of the hook member can be performed in a short time. In addition, in the second invention, when mounting the supporting device, only the portion of the supporting member that is fixed to the lower loop tube needs to be welded, and the vibration isolating member need not be welded. Therefore, the mounting work of the supporting device can be performed in a short time.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention, in which the same reference numerals as in FIG. 9 represent the same parts.

The embodiment shown in FIGS. 1 to 4 is the first superheater tube element support device described in claim 1 of the utility model, and the embodiment shown in FIGS. 5 to 7. The examples correspond to the second superheater tube element supporting device described in claim 2 of the utility model, respectively.

A first embodiment of the present invention will be described with reference to FIGS.

The horizontal loop tubes 5 are arranged in a zigzag pattern in the vertical direction,
In the superheater tube element 6 in which the bent portion 5a from the upper loop tube 5c to the lower loop tube 5b is formed in a U shape and the open portion 7 is formed at the end of the loop tube 5 on the side opposite to the U shape, One of the members 11 and 12 is used as a supporting member (hook member 12) and the other is used as an engaging member (hook member 11), and the tips of the loop pipes 5c and 5b of the upper side and the lower side are opposite to each other. Appropriate gap 13
The two parts are mounted at appropriate intervals in the axial direction of the pipe so that they can be maintained and engaged. I.e. the upper loop tube 5c the lower loop tube
The hook members 11 are provided at two positions on the surface facing the 5b at appropriate intervals in the pipe axis direction so that the hooks are oriented leftward as shown in FIG. 3 and rightward as shown in FIG. And the hook portion and the hook portion of the hook member 11 weld-bonded to the upper loop tube 5c at two positions on the lower loop tube 5b facing the upper loop tube 5c. As shown in FIG. 3 and FIG. 4, the hook member 12 is welded and joined so as to engage with the gap 13 as appropriate, and the upper loop pipe 5c and the lower loop pipe 5b are relatively movable in the pipe axial direction. Upper loop tube 5c
Is mounted and supported on the lower loop tube 5b.

Therefore, even if the upper and lower loop pipes 5c and 5b differ in elongation in the axial direction due to the temperature difference, the upper and lower loop pipes
Since the respective hook portions of the hook members 11 and 12 provided on 5c and 5b are engaged in opposite directions at two points in the pipe axial direction, the upper and lower loop pipes 5c and 5b are relatively in the pipe axial direction. It can move to accommodate the difference in elongation in the axial direction of the pipe, eliminate the occurrence of stress, and have a hook member.
The gap 13 in the engaging portions 11 and 12 makes it possible to damp vibrations generated by using the fluid for heating the superheater tube element or the internal fluid of the superheater tube element as a vibration source, and hooking the upper loop tube 5c. The welded joint with the member 11, the welded joint with the hook member 12 of the lower loop pipe 5b, the hook members 11, 12 and the like are not damaged.

FIGS. 5 and 6 show a second embodiment of the present invention, in which a vibration-proof metal fitting 14 formed in the shape of an endless belt is formed in the vicinity of the U-shaped portion of the loop pipe 5 which continues in a zigzag shape in the vertical direction. Is fitted from the upper end to the lower end as a whole so that the movement in the horizontal direction orthogonal to the pipe axis direction can be restricted,
A male lug 15 is welded to a surface of the lower loop pipe 5b near the U-shaped open portion 7 of the loop pipe 5 facing the upper loop pipe 5c, and the upper loop pipe 5c is inserted through the male lug 15 in the pipe axial direction. It is designed to be movably mounted and supported.

Therefore, even if there is a difference in axial extension between the upper and lower loop pipes 5c, 5b due to a temperature difference, the upper and lower loop pipes 5c, 5b relatively move in the pipe axial direction via the male lug 15. The movement of the pipe in the pipe axial direction absorbs the difference in expansion in the pipe axial direction to prevent stress, and the movement in the horizontal direction orthogonal to the pipe axial direction is regulated by the vibration isolating metal fitting 14 so that it is not overheated. It is also possible to damp vibrations originating from the fluid for heating the tubular element or the internal fluid of the superheater tubular element, and the same effects as the first embodiment shown in FIGS. 1 to 4 described above. Can play.

FIG. 7 shows a third embodiment of the present invention. As in the second embodiment shown in FIGS. 5 and 6, the entire vicinity of the U-shaped portion of the superheater pipe element 6 is extended from the upper end to the lower end. It does not restrict the movement in the horizontal direction orthogonal to the pipe axis direction by fitting the anti-vibration metal fitting 14, but moves in the pipe axis direction via the lower loop pipe 5b and the male lug 15 in which the male lug 15 is welded and connected. The vibration-proof metal fitting 14a is fitted only to the upper loop tube 5c which is placed and supported as much as possible.

Therefore, since the upper and lower loop pipes 5c, 5b are relatively movable in the pipe axial direction, it is possible to absorb the expansion difference in the pipe axial directions of the upper and lower loop pipes 5c, 5b due to the temperature difference. The occurrence of thermal stress can be prevented, and the presence of the antivibration metal fitting 14a makes it possible to reduce the vibration of the fluid heating the superheater pipe element or the internal fluid of the superheater pipe element as the vibration source. The same effects as those of the second embodiment shown in FIGS. 5 and 6 can be obtained.

The support device for the superheater tube element of the present invention is not limited to the embodiment shown and described, and may be, for example, a mechanism other than a mechanism for supporting the superheater tube element 6 in a state of being lifted from the lower side by the support fitting 9. It is optional to apply the present invention to a device that employs a mechanism for suspending and supporting the superheater tube element 6, and to a superheater or the like used for other than the boiler equipment, and various modifications may be made without departing from the gist of the present invention. Of course, it can be added.

[Advantages of the Invention] According to the superheater tube element supporting device of the present invention, it is possible to eliminate the stress caused by the temperature difference and prevent the occurrence of damage to the superheater tube element and its connecting member that have been frequently generated in the past. At the same time, vibration due to the heating fluid of the superheater tube element or the internal fluid of the superheater tube element can be attenuated, the cost required for maintenance and inspection can be reduced and the life of the superheater can be extended. In the second invention, the hook members, which are the supporting member and the engaging member, have a simple structure having an L-shaped cross section, and all the hook members have the same shape, so that the hook members can be easily manufactured. In addition, it can be done in a short time, and the welding area of each hook member is only on one side of the fixed part to the loop pipe, so the welding range is greatly reduced, and therefore the hook member installation work is shortened. What to do in time it can. In addition, in the second invention, when mounting the supporting device, only the portion of the supporting member that is fixed to the lower loop tube needs to be welded, and the vibration isolating member need not be welded. Therefore, various excellent effects are exhibited, such that the work of mounting the supporting device can be performed in a short time.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a superheater tube element supporting device of the present invention, FIG. 2 is an enlarged side view of a portion II of FIG. 1, and FIG. 3 is a III-III of FIG. The direction arrow view, FIG.
Fig. 2 is a view in the direction of IV-IV, Fig. 5 is a perspective view showing a second embodiment of the superheater tube element supporting device of the present invention, and Fig. 6
Fig. 5 is a view taken in the direction of arrows VI-VI in Fig. 5, Fig. 7 is a perspective view showing a third embodiment of the superheater tube element supporting device of the present invention,
FIG. 8 is a schematic view of a boiler, and FIG. 9 is a perspective view showing a conventional superheater tube element. In the figure, 5 is a loop tube, 5a is a bent portion, 5b is a lower loop tube,
5c is an upper loop tube, 6 is a superheater tube element, 7 is an open part, 11 is a hook member (engaging member), 12 is a hook member (supporting member), 13 is a gap, 14 and 14a are vibration-proof metal fittings, Reference numeral 15 indicates an male lug (support member).

Claims (2)

[Scope of utility model registration request] 1. A horizontal loop tube is arranged vertically in a zigzag shape, a bent portion from the upper loop tube to the lower loop tube is formed in a U shape, and the end portion of the loop tube opposite to the U shape is formed. In a superheater tube element having an open portion, the upper loop tube in the vicinity of the open section is engaged with one of two locations with a required gap in the tube axial direction on the surface facing the lower loop tube. A hook member having an L-shaped cross section, which is a member, is fixed such that the tip of the hook portion of the hook member is located between the upper loop tube and the lower loop tube, and the other is a cross section that is an engaging member. The L-shaped hook member is fixed to one of the two facing surfaces of the upper loop tube, and the arrangement of the hook member is opposite to the left-right direction, and the tip of the hook portion is opposite to the upper loop tube and the lower loop tube. It is fixed so that it is located between the loop tube and the upper loop tube of the lower loop tube. A hook member having an L-shaped cross section, which is a supporting member, is fixed at two positions in the tube axis direction on the facing surface of the hook member, and the hook portion and the hook portion of each hook member are fixed to the upper loop pipe. A support device for a superheater pipe element, wherein the support device is fixed so as to support the lower part of the upper loop pipe by engaging with each other at intervals. 2. A horizontal loop tube is arranged in a zigzag pattern in the vertical direction, a bent portion from the upper loop tube to the lower loop tube is formed in a U shape, and the end portion of the loop tube opposite to the U shape is formed. In a superheater tube element having an open portion, a support member for mounting and supporting the upper loop tube immediately above the lower loop tube is fixed to the lower loop tube near the open section, and the support is also provided. A support device for a superheater pipe element, characterized in that a vibration-proof member is fitted in the vicinity of the open portion so that the upper loop pipe is placed and supported by the member and is covered from the outside.