Supporting device of coiled pipe superheater

Abstract

The invention discloses a supporting device of a coiled pipe superheater. Comprising a superheater tube bundle arranged in a vertical flue, a superheater inlet header and a superheater outlet header, the superheater inlet header and the superheater outlet header are connected with the superheater tube bundle, the superheater tube bundle is formed by horizontally arranging a plurality of coiled tubes, hooks with downward openings are arranged at the two ends of each coiled tube, and a supporting plate is arranged on the side wall of the vertical flue. The hooks at the two ends of the coiled pipe are hung on the supporting plate, a plurality of V-shaped notches with upward openings are formed in the positions, corresponding to the hooks at the two ends of the coiled pipe, of the supporting plate, and the hooks are hung in the V-shaped notches. According to the technical scheme, a traditional overheater suspension pipe is omitted, cost is saved, and meanwhile fault points of the overheater are reduced; the coiled pipe of the superheater is not suspended by a traditional pipe hanging structure and is fixed in a two-end supporting mode, shaking of the pipe of the superheater can be effectively relieved, the stability of the superheater is improved, and vibration of a boiler is reduced; the whole supporting device is simple in structure, high in reliability and small in maintenance workload.

Description

Technical Field

[0001] The invention relates to a boiler superheater, in particular to a supporting structure of a pipeline of a boiler superheater. Background Art

[0002] The boiler is a complex equipment complex with multiple systems combined. As a device for producing electric energy, it should meet the requirements of safety, reliability, economy, energy saving and environmental friendliness. The convection superheater located in the flue gas channel at the rear of the boiler is a very important boiler component for increasing the steam temperature.

[0003] The superheater is usually installed in the flue gas channel at the rear of the boiler. Its function is to heat the saturated steam to superheated steam with a certain temperature. This process not only improves the thermal efficiency of the power plant, but also reduces the steam humidity in the last few stages of the turbine, thereby preventing blade corrosion. In addition, the superheater can also reduce the flue gas temperature, recover the heat in the flue gas, and further improve the thermal efficiency. These functions of the superheater have made it an indispensable heat exchange component of modern boilers.

[0004] Superheaters can be divided into convection, radiation and semi-radiation types according to the heat transfer mode, and can be divided into serpentine tube type, screen type, wall type and wall-wrapped type according to the structural characteristics. Serpentine tube high-temperature superheater is a type of superheater, generally composed of superheater inlet header, superheater outlet header and serpentine tube and other components. At present, the serpentine tube part of the superheater is generally arranged in the tail flue of the boiler, and the superheater inlet header and superheater outlet header are arranged outside the burnout chamber or the tail flue; the steam in the superheater flows in the serpentine tube, and the flue gas flushes the tube wall outside the tube to realize the heat exchange between the flue gas and the feed water.

[0005] The serpentine tube part is the heaviest part of the superheater, so the fixing device of the superheater is usually used to fix the serpentine tube. The traditional fixing method is to weld a support frame between the flue side wall of the boiler (membrane water-cooled wall or steel plate welding) and the serpentine tube. However, due to the long-term heating of the superheater, under the effect of thermal expansion and contraction, the welds between the support frame and the serpentine tube and the water-cooled wall tube are prone to cracking. The tearing of the welds is also prone to cracking of the serpentine tube and the water-cooled wall tube. Without support, the serpentine tube is also prone to falling. Another support method is that the superheater serpentine tube is suspended and fixed with a vertically arranged suspension tube. At this time, when the flue gas scours the tube wall, the suspended superheater tube may shake horizontally due to the scouring resistance, affecting the stability of the superheater, easily causing the boiler to vibrate, and having a certain impact on the safe operation of the boiler. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a supporting device for a serpentine tube superheater to solve the problems existing in the background technology.

[0007] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: A supporting device for a serpentine tube superheater comprises a superheater tube bundle arranged in a vertical flue and a superheater inlet header and a superheater outlet header connected to the superheater tube bundle. The superheater tube bundle is formed by a plurality of serpentine tubes arranged horizontally, and is characterized in that two ends of the serpentine tubes are suspended on the side walls of the vertical flue.

[0008] In the above-mentioned supporting device for a serpentine tube superheater, hooks with openings facing downward are provided at both ends of the serpentine tube, a supporting plate is provided on the side wall of the vertical flue, and the hooks at both ends of the serpentine tube are hung on the supporting plate.

[0009] By adopting the above technical solution, the serpentine tube of the superheater is not suspended by the traditional hanging tube structure, but is fixed in the form of supports at both ends, which can effectively reduce the shaking of the superheater tube, increase the stability of the superheater, and reduce the vibration of the boiler.

[0010] Furthermore, a plurality of upwardly opening V-shaped notches are provided on the support plate at positions corresponding to the hooks at both ends of the serpentine tube, and the opening angle of the V-shaped notches is 30° to 90°; the hooks are hung in the V-shaped notches.

[0011] By adopting the above technical solution, the hook of the superheater is hung into the V-shaped notch of the support plate by gravity, and finally fixed at the lowest point of the V-shaped notch. The advantages of the V-shaped notch are: first, the mouth of the V-shaped opening is larger, making it easier to hang the hook of the superheater; second, after the hook of the superheater is hung into the V-shaped notch, even if it is not hung at the center of the V-shaped notch due to the irregularity of the serpentine tube, it can finally be firmly clamped in the V-shaped mouth. The implementation process is as follows: the superheater serpentine tube will sag due to the effect of gravity and vibrate when there is flue gas flowing. With the vibration of the superheater serpentine tube, the hook of the superheater will slide along the two sides of the V-shaped notch to the bottom of the V-shaped notch until it finally slides to the bottom of the V-shaped notch. At this time, the hook of the superheater will be stuck at the bottom of the V-shaped notch and will no longer shake, thereby achieving the purpose of preventing the vibration of the superheater serpentine tube.

[0012] Furthermore, the multiple V-shaped notches are arranged at equal intervals along the length direction of the support plate.

[0013] By adopting the above technical solution, the serpentine tubes can be evenly arranged in the flue.

[0014] In the above-mentioned supporting device for the serpentine tube superheater, the bottom of the V-shaped notch is provided with a circular chamfer.

[0015] By adopting the above technical solution, the circular chamfer provided at the bottom of the V-shaped notch of the superheater support plate can prevent stress concentration.

[0016] In the above-mentioned supporting device for a serpentine tube superheater, the vertical flue is enclosed by a membrane wall, a support plate fixing piece is welded on the flat steel of the membrane wall, and the support plate is connected to the support plate fixing piece.

[0017] In the above-mentioned supporting device for the serpentine tube superheater, the vertical flue can also be formed by welding steel plates, on which support plate fixings are welded, and the support plate is connected to the support plate fixings.

[0018] In the above-mentioned supporting device for a serpentine tube superheater, the vertical flue can also be enclosed by refractory bricks, and support plate fixings are pre-embedded in the refractory bricks, and the support plate is connected to the support plate fixings. Beneficial Effects

[0019] 1. The traditional superheater suspension pipe is removed, which saves costs and reduces the failure points of the superheater; 2. The superheater serpentine tube is not suspended by the traditional hanging tube structure, but fixed by supporting at both ends, which can effectively reduce the shaking of the superheater tube, increase the stability of the superheater, and reduce the vibration of the boiler; 3. The V-shaped notch can make it easier to hook the superheater tube onto the support plate; 4. The entire supporting device has a simple structure, high reliability and small maintenance workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the first embodiment of the present invention.

[0021] Figure 2 It is a front view schematic diagram of the hook in the present invention.

[0022] Figure 3 It is a side view schematic diagram of the hook in the present invention.

[0023] Figure 4 It is a front view schematic diagram of the support plate in Embodiment 1, Embodiment 2 and Embodiment 3 of the present invention.

[0024] Figure 5 yes Figure 4 AA section diagram in.

[0025] Figure 6 yes Figure 4 BB cross-sectional view in .

[0026] Figure 7 It is a front view schematic diagram of the support plate fixing member in Embodiment 1, Embodiment 2 and Embodiment 3 of the present invention.

[0027] Figure 8It is a side view schematic diagram of the support plate fixing member in Embodiment 1, Embodiment 2 and Embodiment 3 of the present invention.

[0028] Fig. 9 It is a schematic diagram of the second embodiment of the present invention.

[0029] Fig.10 It is a schematic diagram of the third embodiment of the present invention.

[0030] Fig.11 It is a schematic diagram of Embodiment 4 of the present invention.

[0031] Fig.12 It is a front view schematic diagram of the support plate in the fourth embodiment of the present invention.

[0032] Fig.13 It is a side view schematic diagram of the support plate in the fourth embodiment of the present invention.

[0033] In the figure: 1 serpentine tube, 2-1, 2-2 flue side walls, 3 hooks, 4 support plates, 4-1 V-shaped notch, 4-2 through hole, 5 support plate fixing piece. DETAILED DESCRIPTION

[0034] The present invention will be further described below by way of non-limiting embodiments in conjunction with the accompanying drawings. Embodiment 1:

[0035] Please see Figures 1 to 8 A supporting device for a serpentine tube superheater includes a superheater tube bundle arranged in a vertical flue and a superheater inlet header and a superheater outlet header connected to the superheater tube bundle. The superheater tube bundle is formed by a plurality of serpentine tubes 1 arranged horizontally. The superheater inlet header, the superheater outlet header and the superheater intermediate header are all arranged on the upper part of the superheater and located outside the furnace (not shown in the figure). The two ends of the serpentine tube 1 are respectively suspended on the vertical flue side wall 2-1 and the flue side wall 2-2.

[0036] Specifically, hooks 3 with openings facing downwards are welded at the elbows at both ends of the serpentine tube 1 , and a support plate 4 is provided on the side wall of the vertical flue, and the hooks 3 at both ends of the serpentine tube 1 are hung on the support plate 4 .

[0037] In this embodiment, the vertical flue is enclosed by a membrane water-cooled wall, which is an airtight tube screen formed by connecting multiple vertical tubes side by side with flat steel. A support plate fixing part 5 is welded to the flat steel of the membrane wall, and the support plate fixing part 5 is stepped. A through hole 4-2 is provided on the support plate 4. The large end of the support plate fixing part 5 is welded and fixed to the flat steel of the membrane wall. After the small end 5-1 passes through the through hole 4-2, the support plate 4 is fixed to the support plate fixing part 5 by welding.

[0038] A plurality of V-shaped notches 4-1 with openings facing upward are arranged at positions on the support plate 4 corresponding to the hooks 3 at both ends of the serpentine tube 1. The opening angle of the V-shaped notch 4-1 is 30° to 90°, and 60° is selected in this embodiment; the hooks 3 are hung in the V-shaped notches. The plurality of V-shaped notches are arranged at equal intervals along the length direction of the support plate 4. The bottom of the V-shaped notch 4-1 is provided with a rounded chamfer.

[0039] The serpentine tube 1 can be a plain tube or a fin tube. In this embodiment, the serpentine tube 1 is a plain tube. Embodiment 2:

[0040] Please see Figures 2 to 9 A supporting device for a serpentine tube superheater includes a superheater tube bundle arranged in a vertical flue and a superheater inlet header and a superheater outlet header connected to the superheater tube bundle. The superheater tube bundle is formed by a plurality of serpentine tubes 1 arranged horizontally. The superheater inlet header, the superheater outlet header and the superheater intermediate header are all arranged on the upper part of the superheater and located outside the furnace (not shown in the figure). The two ends of the serpentine tube 1 are respectively suspended on the vertical flue side wall 2-1 and the flue side wall 2-2.

[0041] Specifically, hooks 3 with openings facing downwards are welded at the elbows at both ends of the serpentine tube 1 , and a support plate 4 is provided on the side wall of the vertical flue, and the hooks 3 at both ends of the serpentine tube 1 are hung on the support plate 4 .

[0042] In this embodiment, the vertical flue is formed by welding steel plates, the support plate fixing member 5 is stepped, and a through hole 4-2 is provided on the support plate 4. The large end of the support plate fixing member 5 is welded and fixed to the flat steel of the membrane wall. After the small end 5-1 passes through the through hole 4-2, the support plate 4 is fixed to the support plate fixing member 5 by welding.

[0043] A plurality of V-shaped notches 4-1 with openings facing upward are arranged at positions corresponding to the hooks 3 at both ends of the serpentine tube 1 on the support plate 4. The opening angle of the V-shaped notches 4-1 is 30° to 90°, and 30° is selected in this embodiment. The hooks 3 are hooked in the V-shaped notches 4-1. The plurality of V-shaped notches 4-1 are arranged at equal intervals along the length direction of the support plate 4. The bottom of the V-shaped notches 4-1 is provided with a rounded chamfer.

[0044] The serpentine tube 1 can be a plain tube or a finned tube. In this embodiment, the serpentine tube 1 is a finned tube. Embodiment three:

[0045] Please see Figures 2 to 8 , Fig.10A supporting device for a serpentine tube superheater includes a superheater tube bundle arranged in a vertical flue and a superheater inlet header and a superheater outlet header connected to the superheater tube bundle. The superheater tube bundle is formed by a plurality of serpentine tubes 1 arranged horizontally. The superheater inlet header, the superheater outlet header and the superheater intermediate header are all arranged on the upper part of the superheater and located outside the furnace (not shown in the figure). The two ends of the serpentine tube 1 are respectively suspended on the vertical flue side wall 2-1 and the flue side wall 2-2.

[0046] Specifically, hooks 3 with openings facing downwards are welded at the elbows at both ends of the serpentine tube 1 , and a support plate 4 is provided on the side wall of the vertical flue, and the hooks 3 at both ends of the serpentine tube 1 are hung on the support plate 4 .

[0047] In this embodiment, the vertical flue is enclosed by refractory bricks, and a support plate fixing part 5 is embedded in the refractory bricks. The support plate fixing part 5 is stepped, and a through hole 4-2 is provided on the support plate 4. The large end of the support plate fixing part 5 is welded and fixed to the flat steel of the membrane wall. After the small end 5-1 passes through the through hole 4-2, the support plate 4 is fixed to the support plate fixing part 5 by welding.

[0048] A plurality of V-shaped notches 4-1 with openings facing upward are arranged at positions on the support plate 4 corresponding to the hooks 3 at both ends of the serpentine tube 1. The opening angle of the V-shaped notches 4-1 is 30° to 90°, and 90° is selected in this embodiment. The hooks 3 are hooked in the V-shaped notches 4-1. The plurality of V-shaped notches 4-1 are arranged at equal intervals along the length direction of the support plate 4. The bottom of the V-shaped notches 4-1 is provided with a rounded chamfer.

[0049] The serpentine tube 1 can be a plain tube or a finned tube. In this embodiment, the serpentine tube 1 is a finned tube. Embodiment 4:

[0050] Please see Figures 2 to 3 , Figures 11 to 13 A supporting device for a serpentine tube superheater, wherein the vertical flue is enclosed by a membrane water-cooled wall, wherein the membrane water-cooled wall is an airtight tube screen formed by connecting a plurality of vertical tubes side by side with flat steel, the supporting plate 4 is L-shaped, and the lower end is directly welded to the flat steel of the membrane wall, and the rest of the structure is the same as that of the first embodiment.

[0051] The embodiments listed above are only for the purpose of understanding the present invention and are not limitations on the technical solutions described in the present invention. Ordinary technicians in the relevant fields can make various changes or deformations based on the technical solutions described in the claims. All equivalent changes or deformations should be included in the scope of protection of the claims of the present invention.

Claims

1. A supporting device for a serpentine tube superheater, comprising a superheater tube bundle arranged in a vertical flue, and a superheater inlet header and a superheater outlet header connected to the superheater tube bundle, wherein the superheater tube bundle is formed by a plurality of serpentine tubes arranged horizontally, and characterized in that: The two ends of the serpentine tube are hung on the side walls of the vertical flue.

2. The supporting device for a serpentine tube superheater according to claim 1, characterized in that: Hooks with openings facing downwards are arranged at both ends of the serpentine tube, and a support plate is arranged on the side wall of the vertical flue, and the hooks at both ends of the serpentine tube are hung on the support plate.

3. The supporting device for a serpentine tube superheater according to claim 2, characterized in that: A plurality of upwardly opening V-shaped notches are arranged on the support plate at positions corresponding to the hooks at both ends of the serpentine tube, and the opening angle of the V-shaped notches is 30° to 90°; the hooks are hung in the V-shaped notches.

4. The supporting device for a serpentine tube superheater according to claim 3, characterized in that: The multiple V-shaped notches are arranged at equal intervals along the length direction of the support plate.

5. The supporting device for a serpentine tube superheater according to claim 3, characterized in that: The bottom of the V-shaped notch is provided with a circular chamfer.

6. A supporting device for a serpentine tube superheater according to claim 2, 3, 4 or 5, characterized in that: The vertical flue is enclosed by a membrane wall, a support plate fixing piece is welded on the flat steel of the membrane wall, and the support plate is connected to the support plate fixing piece.

7. A supporting device for a serpentine tube superheater according to claim 2, 3, 4 or 5, characterized in that: The vertical flue is formed by welding steel plates, support plate fixing pieces are welded on the steel plates, and the support plates are connected to the support plate fixing pieces.

8. A supporting device for a serpentine tube superheater according to claim 2, 3, 4 or 5, characterized in that: The vertical flue is enclosed by refractory bricks, and support plate fixings are embedded in the refractory bricks. The support plate is connected to the support plate fixings.

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