A compact pipe re-heater arrangement assembly

Abstract

This utility model provides a compact tube reheater arrangement assembly, relating to the field of tube reheater technology. It includes: a reheater tube bundle arrangement frame, with a hanger fixed to the upper surface of the frame. Elliptical straight tubes and elliptical bent tubes are staggered welded to the inner side of the frame. The side ends of the elliptical straight tubes are connected to the elliptical bent tubes. Steam straight tubes and steam bent tubes are screwed onto the side of the frame. Spiral ribs are equidistantly welded to the outer surface of the steam straight tubes. Turbidators are installed inside the steam straight tubes, and the steam straight tubes are arranged at the lower ends of the elliptical straight tubes. This utility model solves the problem that existing tube reheaters typically use straight tubes or bent tubes with large curvature radii, resulting in large tube bundle spacing and requiring a large space for the arrangement assembly.

Description

Technical Field

[0001] This utility model relates to the field of pipe reheater technology, and specifically to a compact pipe reheater arrangement assembly. Background Technology

[0002] Tubular reheaters are key heating surfaces in modern high-parameter, large-capacity power plant boilers. Their function is to return steam (low-temperature, medium-pressure) that has already done some work in the high-pressure cylinder of the steam turbine to the boiler, reheat it to a high temperature, and then send it back to the intermediate-pressure and low-pressure cylinders of the turbine to continue doing work. The main purpose of this is to improve the thermal efficiency of the power plant and reduce the humidity of the steam in the last-stage turbine blades, protecting the blades. A tubular reheater is a collection of all components that ensure the safe and reliable operation of a boiler by arranging these tube bundles or tube banks composed of a large number of parallel steel tubes and installing them in a specific manner within the boiler. However, existing tubular reheaters typically use straight tubes or bends with large radii of curvature, resulting in large tube bundle spacing and requiring significant space for component arrangement. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a compact tube reheater arrangement assembly is provided to solve the problem that existing tube reheaters typically use straight tubes or bends with large curvature radii, resulting in large tube bundle spacing and requiring a large space for the arrangement assembly.

[0004] To achieve the above objectives, a compact tube reheater arrangement assembly is provided, comprising: a reheater tube bundle arrangement frame, wherein a hanger rod is fixed to the upper surface of the reheater tube bundle arrangement frame. The reheater tube bundle arrangement frame has elliptical straight tubes and elliptical bent tubes welded alternately on its inner side. The side ends of the elliptical straight tubes are connected to the elliptical bent tubes. Steam straight tubes and steam bent tubes are screwed onto the side of the reheater tube bundle arrangement frame. Spiral ribs are welded at equal intervals on the outer surface of the steam straight tubes. Turbidators are installed inside the steam straight tubes. The steam straight tubes are arranged at the lower end of the elliptical straight tubes.

[0005] Furthermore, the right end face of the reheater tube bundle arrangement frame is provided with a steam inlet and a steam outlet, which are arranged vertically.

[0006] Furthermore, the reheater tube bundle arrangement frame is connected to the elliptical straight pipe through the steam inlet, and the reheater tube bundle arrangement frame is connected to the steam straight pipe through the steam outlet.

[0007] Furthermore, the reheater tube bundle arrangement frame is provided with ventilation slots on both the front and rear ends, and corrugated fins are inserted into the ventilation slots at equal intervals.

[0008] Furthermore, the upper and lower ends of the corrugated fins are fixed to the reheater tube bundle arrangement frame through fixing screws.

[0009] Furthermore, flanges are provided at the left and right ends of the steam straight pipe, and the steam straight pipe and steam bend are bolted together on the inner and outer sides of the reheater tube bundle arrangement frame.

[0010] Furthermore, a fixing plate is welded to the inner wall of the steam straight pipe, and a turbulence disruptor is movably connected between the fixing plates.

[0011] Furthermore, the disturbance element is inserted in a spiral ribbon shape into the steam straight pipe.

[0012] The beneficial effects of this utility model are that the compact tube reheater arrangement assembly utilizes staggered elliptical straight tubes and steam straight tubes in a modular mixed assembly on the arrangement frame. The elliptical straight tubes in the front half withstand high temperatures and wear, while the steam straight tubes in the rear half, with spiral fins welded to their surfaces, enhance heat transfer. This allows for sufficient heat exchange between the flue gas flowing between the arrangement frames and the steam flowing inside the pipes, facilitating the expansion of the heat transfer area on the flue gas side without increasing the space for the reheater tube bundle arrangement. It also reduces the spacing between the tube bundle arrangement components, thereby improving the compactness and heat exchange efficiency of the tube reheater arrangement assembly. Attached Figure Description

[0013] Figure 1 This is a side cross-sectional view of the compact tubular reheater arrangement assembly according to an embodiment of the present invention.

[0014] Figure 2 This is a front view structural schematic diagram of the compact tubular reheater arrangement assembly according to an embodiment of the present invention.

[0015] Figure 3 This is a side view cross-sectional structural diagram of the steam straight pipe according to an embodiment of the present invention.

[0016] Figure 4 This is a front view structural diagram of the elliptical straight pipe and the steam straight pipe according to an embodiment of the present utility model.

[0017] In the diagram: 1. Reheater tube bundle arrangement frame; 11. Hanger rod; 12. Vent slot; 13. Steam inlet; 14. Steam outlet; 2. Elliptical straight pipe; 21. Elliptical bend; 3. Steam straight pipe; 31. Steam bend; 32. Spiral fin; 33. Flange; 34. Turbine; 35. Fixing plate; 4. Corrugated fin; 41. Fixing screw. Detailed Implementation

[0018] Reference Figures 1 to 4 As shown, this utility model provides a compact tube reheater arrangement assembly, including: a reheater tube bundle arrangement frame 1, with a hanger 11 fixed on the upper surface of the reheater tube bundle arrangement frame 1. Elliptical straight tubes 2 and elliptical bent tubes 21 are staggered welded on the inner side of the reheater tube bundle arrangement frame 1. The side end of the elliptical straight tube 2 is connected to the elliptical bent tube 21. Steam straight tubes 3 and steam bent tubes 31 are screwed on the side of the reheater tube bundle arrangement frame 1. Spiral ribs 32 are welded at equal intervals on the outer surface of the steam straight tube 3. A turbulence maker 34 is installed inside the steam straight tube 3. The steam straight tubes 3 are arranged at the lower end of the elliptical straight tubes 2.

[0019] The reheater tube bundle arrangement frame 1 has elliptical straight tubes 2 and steam straight tubes 3 arranged in a modular hybrid assembly with staggered distribution on the inner side. This reduces the spacing of traditional tube reheater components, thus forming a compact tube reheater arrangement assembly. The elliptical straight tubes 2 in the front half withstand high temperatures and wear, while the steam straight tubes 3 in the rear half, with spiral fins 32 welded to their surfaces, enhance heat transfer. This allows for sufficient heat exchange between the flue gas flowing between the arrangement frames and the steam flowing inside the pipes, facilitating the expansion of the heat transfer area on the flue gas side without increasing the space for reheater tube bundle arrangement. It also reduces the spacing of the tube reheater components, improving the compactness and heat exchange efficiency of the tube reheater arrangement assembly.

[0020] In this embodiment, the right end face of the reheater tube bundle arrangement frame 1 is provided with a steam inlet 13 and a steam outlet 14, which are arranged vertically. The reheater tube bundle arrangement frame 1 is connected to the elliptical straight pipe 2 through the steam inlet 13, and the reheater tube bundle arrangement frame 1 is connected to the steam straight pipe 3 through the steam outlet 14.

[0021] In a preferred embodiment, the steam inlet 13 and steam outlet 14 are connected to the steam pipe, allowing steam to enter and exit the pipes within the reheater tube bundle arrangement 1. The steam enters the elliptical pipe through the steam inlet 13, then enters the steam pipe, and finally exits from the steam outlet 14. When the steam flows through the pipes within the reheater tube bundle arrangement 1, it exchanges heat with the high-temperature flue gas flowing outside the pipes, achieving a temperature increase. The elliptical bend 21 is connected to the steam bend 31 via a connecting pipe, thus forming a complete top-to-bottom flow path for the steam.

[0022] In this embodiment, ventilation slots 12 are provided on both the front and rear ends of the reheater tube bundle arrangement frame 1, and corrugated fins 4 are inserted into the ventilation slots 12 at equal intervals. The upper and lower ends of the corrugated fins 4 are fixed to the reheater tube bundle arrangement frame 1 through fixing screws 41.

[0023] In a preferred embodiment, the ventilation slot 12 is used for the flow of high-temperature flue gas, allowing the high-temperature flue gas to flow inside the reheater tube bundle arrangement frame 1 and exchange heat with the steam flowing in the pipes. A dust collection frame can be installed on the lower frame surface of the reheater tube bundle arrangement frame 1 to collect dust particles that fall from the inner pipe surface of the arrangement frame due to the flow of flue gas. The corrugated fins 4 facilitate a more even and dispersed flow of flue gas into the inner side of the reheater tube bundle arrangement frame 1.

[0024] In this embodiment, flanges 33 are provided at the left and right ends of the steam straight pipe 3. The steam straight pipe 3 and the steam elbow 31 are bolted together and installed on the inner and outer sides of the reheater tube bundle arrangement frame 1. A fixing plate 35 is welded to the inner wall of the steam straight pipe 3, and a turbulence 34 is movably sleeved between the fixing plates 35. The turbulence 34 is inserted into the steam straight pipe 3 in a spiral strip shape.

[0025] As a preferred implementation, the steam straight pipe 3 and the steam bend 31 can be disassembled and replaced for easy daily cleaning and maintenance. The spiral fins 32 on the surface of the steam straight pipe 3 can guide the flow of flue gas and at the same time disrupt the laminar boundary layer of the flue gas, generating strong turbulence and significantly improving the heat transfer coefficient. The turbulence diffuser 34 is used to disturb the flow of steam, enhance heat transfer inside the steam straight pipe 3, make the pipe wall temperature more uniform, and prevent local overheating.

[0026] The compact tube reheater arrangement assembly of this utility model can effectively solve the problem that existing tube reheaters usually use straight tubes or bends with large curvature radii, resulting in large tube bundle spacing and the need for a large space for the arrangement assembly. It can expand the heat transfer area on the flue gas side without increasing the space for reheater tube bundle arrangement, reduce the tube bundle arrangement spacing of tube reheater, and improve the compactness and heat exchange efficiency of tube reheater arrangement assembly. It is suitable for compact tube reheater arrangement assemblies.

Claims

1. A compact tubular reheater arrangement assembly, comprising: Reheater tube bundle arrangement frame (1), wherein a hanger (11) is fixed on the upper surface of the reheater tube bundle arrangement frame (1), characterized in that: The reheater tube bundle arrangement frame (1) has elliptical straight tubes (2) and elliptical bent tubes (21) welded alternately on the inner side. The side end of the elliptical straight tube (2) is connected to the elliptical bent tube (21). The side of the reheater tube bundle arrangement frame (1) is screwed with steam straight tubes (3) and steam bent tubes (31). The outer surface of the steam straight tube (3) is welded with spiral ribs (32) at equal intervals. The steam straight tube (3) is provided with a turbulence generator (34) inside the steam straight tube (3). The steam straight tubes (3) are arranged at the lower end of the elliptical straight tubes (2).

2. The compact tubular reheater arrangement assembly according to claim 1, characterized in that, The reheater tube bundle arrangement frame (1) has a steam inlet (13) and a steam outlet (14) on its right end face, and the steam inlet (13) and the steam outlet (14) are arranged vertically.

3. A compact tubular reheater arrangement assembly according to claim 2, characterized in that, The reheater tube bundle arrangement frame (1) is connected to the elliptical straight pipe (2) through the steam inlet (13), and the reheater tube bundle arrangement frame (1) is connected to the steam straight pipe (3) through the steam outlet (14).

4. A compact tubular reheater arrangement assembly according to claim 1, characterized in that, The reheater tube bundle arrangement frame (1) is provided with ventilation slots (12) on both the front and rear ends, and corrugated fins (4) are inserted into the ventilation slots (12) at equal intervals.

5. A compact tubular reheater arrangement assembly according to claim 4, characterized in that, The corrugated fin (4) is fixed to the reheater tube bundle arrangement frame (1) through the upper and lower ends by fixing screws (41).

6. A compact tubular reheater arrangement assembly according to claim 1, characterized in that, The steam straight pipe (3) is provided with flanges (33) at the left and right ends. The steam straight pipe (3) and the steam bend (31) are bolted together and installed on the inner and outer sides of the reheater tube bundle arrangement frame (1).

7. A compact tubular reheater arrangement assembly according to claim 1, characterized in that, A fixing plate (35) is welded to the inner wall of the steam straight pipe (3), and a turbulence element (34) is movably connected between the fixing plates (35).

8. A compact tubular reheater arrangement assembly according to claim 1, characterized in that, The turbulence generator (34) is inserted into the steam straight pipe (3) in a spiral strip shape.

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