Tube bundle and feedwater preheater

Abstract

The utility model relates to a tube bundle and feedwater preheater, and the tube bundle includes: fixed tube plate is arranged in the left side of shell, floating tube plate is covered in the shell, and is parallelly arranged with fixed tube plate, first baffle is fixedly connected with fixed tube plate and floating tube plate respectively at left and right ends, is located on the radial of shell, and upper and lower ends are sealed contact with the inner wall of shell respectively, second baffle is fixedly connected with fixed tube plate at left end, and right end is inserted and fixed in the left side of first baffle and is perpendicular with first baffle, second baffle is located on the radial of shell, and the front and back ends of second baffle are sealed contact with the inner wall of shell respectively, wherein, the rear end of first baffle has a gap in the lower end part of second baffle, and there is interval between the right end of second baffle and floating tube plate, so that the inner wall of shell is separated into four shell passes which are communicated in turn between first baffle, second baffle and the inner wall of shell, and the utility model has the advantages of simple structure, low cost, convenient installation, enough shell pass quantity, high heat exchange efficiency and suitability for small heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to tube bundles and feedwater preheaters. Background Technology

[0002] A baffle plate is a device that improves the heat transfer effect of a heat exchanger. By changing the fluid motion state, it enhances the mixing and flow of the fluid in the tube, thereby improving the heat transfer capacity.

[0003] When using small heat exchangers, the small shell cross-section, short flow path, and high degree of fluid mixing make adding baffles costly and difficult. Without baffles, the heat transfer efficiency of the heat exchanger may decrease.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model discloses a tube bundle and a feedwater preheater to solve the problem that small heat exchangers cannot simultaneously achieve both heat exchange efficiency and low cost.

[0006] The technical solution adopted in this utility model is as follows: A tube bundle is used in a feedwater preheater, which includes a shell, the shell being a hollow structure open at the left end and closed at the right end; the tube bundle includes: a fixed tube sheet disposed on the left side of the shell; a floating tube sheet sleeved inside the shell and arranged parallel to the fixed tube sheet; a first partition plate, with its left and right ends fixedly connected to the fixed tube sheet and the floating tube sheet respectively, located radially on the shell, and its upper and lower ends respectively sealingly contacting the inner wall of the shell; a second partition plate, with its left end fixedly connected to the fixed tube sheet and its right end inserted and fixed to the left side of the first partition plate and perpendicular to the first partition plate, the second partition plate being located radially on the shell, and its front and rear ends respectively sealingly contacting the inner wall of the shell; and heat exchange tubes, with both ends passing through the fixed tube sheet and the floating tube sheet respectively, positioned corresponding to the sides of the first and second partition plates; wherein, the rear end of the first partition plate has a notch at the lower end of the second partition plate, and there is a gap between the right end of the second partition plate and the floating tube sheet.

[0007] A further technical solution is that the tube bundle further includes: a retaining ring, which is annular, perpendicular to the length direction of the shell, and circumferentially disposed on the inner wall of the shell; there are a plurality of retaining rings, which are spaced apart along the length direction of the shell; wherein, the upper and lower ends of the first partition pass through and are fixedly connected to the retaining ring, and the front and rear ends of the second partition pass through and are fixedly connected to the retaining ring.

[0008] A further technical solution is as follows: a sealing plate and a pressure strip are sequentially provided at the upper and lower front ends of the first partition, and bolts are sequentially passed through the pressure strip, the sealing plate, and the first partition and threadedly connected to the nut; a sealing plate and a pressure strip are sequentially provided at the upper front and lower rear ends of the second partition, and bolts are sequentially passed through the pressure strip, the sealing plate, and the second partition and threadedly connected to the nut; wherein, the sealing plate protrudes from the ends of the first and second partitions and elastically compresses the inner wall of the housing.

[0009] A further technical solution is that the tube bundle further includes: a reverse flange ring, which is fixedly connected to the right side of the floating tube sheet; and a floating head cover, which is bolted to the right end of the reverse flange ring and seals the reverse flange ring.

[0010] A further technical solution is that the left and right sides of the first partition are welded to the fixed tube sheet and the floating tube sheet respectively, and the left side of the second partition is welded to the fixed tube sheet.

[0011] A further technical solution is that the first partition plate and the second partition plate are welded together.

[0012] This utility model also discloses a water preheater, characterized in that the water preheater includes: a shell, which is a hollow structure with an open left end and a closed right end, with a heating water inlet at the upper front end and a heating water outlet at the upper rear end; a tube bundle as described above, fitted inside the shell; and a tube box, which is a hollow structure with a closed left end and an open right end, disposed on the left side of the tube bundle. The tube box, a fixed tube plate, and the shell are bolted together. A partition plate is vertically arranged inside the tube box, dividing the interior of the tube box into two cavities. A heated water inlet is provided at the upper front end of the tube box, and a heated water outlet is provided at the upper rear end of the tube box. The heated water inlet communicates with one of the cavities, and the heated water outlet communicates with the other cavity.

[0013] A further technical solution is that saddles are provided on the left and right sides of the lower end of the housing.

[0014] The beneficial effects of this utility model embodiment are as follows: (I) The tube bundle of this utility model embodiment is formed by arranging a first partition and a second partition that are perpendicular to each other along the radial direction of the shell. The left and right ends of the first partition are respectively fixedly connected to a fixed tube sheet and a floating tube sheet. The rear end of the first partition has a notch at the lower end of the second partition. The left end of the second partition is fixedly connected to the fixed tube sheet, and the right end is inserted and fixed to the left side of the first partition. There is a gap between the right end of the second partition and the floating partition. The first partition, the second partition and the inner wall of the shell are separated into four shell sides that are connected in sequence. The structure is simple, the cost is low, the installation is convenient, and the number of shell sides is sufficient. The heat exchange efficiency is high and it is suitable for small heat exchangers.

[0015] (ii) Furthermore, by inserting the entire tube bundle into the shell and then bolting the tube box, fixed tube sheet and shell together, the water preheater can be installed and disassembled as a whole. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the water preheater of this utility model.

[0017] Figure 2 This is a front view schematic diagram of the tube bundle of this utility model.

[0018] Figure 3 This is an isometric view of the first and second diaphragms in the tube bundle of this utility model.

[0019] Figure 4 for Figure 2 Sectional view at AA.

[0020] Figure 5 This is a schematic diagram of the structure of the ends of the first and second diaphragms in the tube bundle of this utility model.

[0021] Figure 6 for Figure 1 Sectional view at BB.

[0022] Figure 7 for Figure 1 Sectional view at CC.

[0023] In the picture: 1. Shell; 11. Heating water inlet; 12. Heating water outlet; 13. Saddle; 2. Tube box; 21. Divider plate; 22. Heated water inlet; 23. Heated water outlet; 3. Tube bundle; 31. Fixed tube sheet; 32. Floating tube sheet; 33. Heat exchange tube; 34. First partition plate; 35. Second partition plate; 36. Retaining ring; 371. Reverse flange ring; 372. Floating head cover; 38. Sealing plate; 39. Pressure strip. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0025] First embodiment: This embodiment discloses tube bundle 3.

[0026] like Figure 1 As shown, the tube bundle 3 is used in the feedwater preheater, which includes a shell 1. The shell 1 is a hollow structure with an opening at the left end and a closing at the right end. For example, the shell 1 is a hollow cylinder with a cap on the right side.

[0027] like Figure 2 As shown, the tube bundle 3 includes a fixed tube sheet 31, a floating tube sheet 32, a first baffle 34, a second baffle 35, and heat exchange tubes 33.

[0028] The fixed tube sheet 31 is disposed on the left side of the housing 1. The floating tube sheet 32 ​​is sleeved inside the housing 1 and is disposed parallel to the fixed tube sheet 31. For example, the fixed tube sheet 31 and the floating tube sheet 32 ​​are circular plates, perpendicular to the length direction of the housing 1.

[0029] like Figure 3 and Figure 4 As shown, the first partition 34 is fixedly connected to the fixed tube plate 31 and the floating tube plate 32 at its left and right ends, respectively, and is located radially in the housing 1. Its upper and lower ends are in sealed contact with the inner wall of the housing 1. The second partition 35 is fixedly connected to the fixed tube plate 31 at its left end, and inserted and fixed to the left side of the first partition 34 at its right end, perpendicular to the first partition 34. The second partition 35 is located radially in the housing 1, and its front and rear ends are in sealed contact with the inner wall of the housing 1. For example, the left and right sides of the first partition 34 are welded to the fixed tube plate 31 and the floating tube plate 32, respectively, and the left side of the second partition 35 is welded to the fixed tube plate 31. A slot is provided in the middle of the left end of the first partition 34 for the second partition 35 to be inserted. After insertion, the second partition 35 is welded to the first partition 34.

[0030] The heat exchange tubes 33 are horizontally arranged, passing through the fixed tube sheet 31 and the floating tube sheet 32 ​​at both ends, respectively, corresponding to the sides of the first partition 34 and the second partition 35. The rear end of the first partition 34, located below the second partition 35, has a notch, and there is a gap between the right end of the second partition 35 and the floating tube sheet 32. Specifically, the shell-side medium flows in the following direction: upper front cavity → lower front cavity → lower rear cavity → upper rear cavity.

[0031] like Figure 2 and Figure 4 As shown, the tube bundle 3 further includes retaining rings 36. The retaining rings 36 are annular, perpendicular to the length direction of the housing 1, and circumferentially disposed on the inner wall of the housing 1. Several retaining rings 36 are arranged at intervals along the length direction of the housing 1. The upper and lower ends of the first partition plate 34 pass through and are fixedly connected to the retaining rings 36, and the front and rear ends of the second partition plate 35 pass through and are fixedly connected to the retaining rings 36, restricting circumferential movement between the first partition plate 34 and the second partition plate 35 and improving structural robustness. For example, both the first partition plate 34 and the second partition plate 35 are welded to the retaining rings 36.

[0032] like Figure 4 and Figure 5As shown, furthermore, a sealing plate 38 and a pressure strip 39 are sequentially arranged at the upper and lower front ends of the first partition 34. Bolts pass through the pressure strip 39, the sealing plate 38, and the first partition 34 in sequence and are threadedly connected to nuts. A sealing plate 38 and a pressure strip 39 are sequentially arranged at the front upper end and the rear lower lower end of the second partition 35. Bolts pass through the pressure strip 39, the sealing plate 38, and the second partition 35 in sequence and are threadedly connected to nuts. The sealing plate 38 protrudes from the ends of the first partition 34 and the second partition 35 and elastically presses against the inner wall of the shell 1. The sealing plates 38 are all bent towards the medium inlet direction to guide the heating water to flow in the correct direction and ensure heat exchange efficiency.

[0033] like Figure 2 As shown, the tube bundle 3 further includes a reverse flange ring 371 and a floating head cover 372. The reverse flange ring 371 is fixedly connected to the right side of the floating tube sheet 32. The floating head cover 372 is bolted to the right end of the reverse flange ring 371 and seals the reverse flange ring 371. The reverse flange ring 371 and the floating head cover 372 form a housing to change the fluid direction, while facilitating installation and disassembly.

[0034] In this embodiment, by arranging the first partition 34 and the second partition 35, which are perpendicular to each other, radially along the shell 1, the left and right ends of the first partition 34 are respectively fixedly connected to the fixed tube sheet 31 and the floating tube sheet 32, and the rear end of the first partition 34 has a notch at the lower end of the second partition 35. The left end of the second partition 35 is fixedly connected to the fixed tube sheet 31, and the right end is inserted and fixed to the left side of the first partition 34. There is a gap between the right end of the second partition 35 and the floating partition plate 21, so that the first partition 34, the second partition 35 and the inner wall of the shell 1 are separated into four shell passes that are connected in sequence. The structure is simple, the cost is low, the installation is convenient, and the number of shell passes is sufficient, resulting in high heat exchange efficiency.

[0035] Second embodiment: This embodiment discloses a water preheater.

[0036] like Figure 1 As shown, the water preheater includes a shell 1, a tube bundle 3, and a tube box 2.

[0037] The shell 1 is a hollow structure with an opening on the left and a closing on the right. A heating water inlet 11 is provided at the upper front end, and a heating water outlet 12 is provided at the upper rear end.

[0038] As in the first embodiment, the tube bundle 3 is fitted inside the housing 1.

[0039] like Figure 1 , Figure 6 and Figure 7As shown, the tube box 2 is a hollow structure with a closed left end and an open right end, and is located on the left side of the tube bundle 3. The tube box 2, the fixed tube plate 31, and the shell 1 are bolted together. A partition plate 21 is vertically installed inside the tube box 2, which divides the interior of the tube box 2 into two cavities. The upper front end of the tube box 2 is provided with a heated water inlet 22, and the upper rear end of the tube box 2 is provided with a heated water outlet 23. The heated water inlet 22 is connected to one of the cavities, and the heated water outlet 23 is connected to the other cavity.

[0040] like Figure 1 As shown, saddles 13 are further provided on the left and right sides of the lower end of the housing 1.

[0041] In this embodiment, the tube bundle 3 is inserted into the housing 1 as a whole, and then the tube box 2, the fixed tube plate 31, and the housing 1 are bolted together, making the overall installation and disassembly convenient.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A tubular bundle, characterized in that, For use in a feedwater preheater, the feedwater preheater includes a shell, the shell being a hollow structure open at the left end and closed at the right end; the tube bundle includes: The fixed tube sheet is located on the left side of the housing; A floating tube sheet is fitted inside the housing and is arranged parallel to the fixed tube sheet; The first partition plate is fixedly connected to the fixed tube plate and the floating tube plate at its left and right ends, respectively, and is located in the radial direction of the shell. Its upper and lower ends are in sealed contact with the inner wall of the shell. The second partition plate has its left end fixedly connected to the fixed tube plate, and its right end inserted and fixed to the left side of the first partition plate and perpendicular to the first partition plate. The second partition plate is located in the radial direction of the shell, and its front and rear ends are respectively in sealed contact with the inner wall of the shell. The heat exchange tubes pass through the fixed tube sheet and the floating tube sheet at both ends, respectively, and are positioned corresponding to the sides of the first and second partitions. The first partition has a notch at the rear end of the second partition located below it, and there is a gap between the right end of the second partition and the floating tube plate.

2. The tube bundle according to claim 1, characterized in that, The tube bundle also includes: The retaining ring is annular, perpendicular to the length direction of the housing, and is circumferentially disposed on the inner wall of the housing. There are several retaining rings, which are spaced apart along the length direction of the housing. The first partition has its upper and lower ends passing through and fixedly connected to the retaining ring, and the second partition has its front and rear ends passing through and fixedly connected to the retaining ring.

3. The tube bundle according to claim 1, characterized in that: A sealing plate and a pressure strip are sequentially provided at the upper and lower front ends of the first partition. Bolts pass through the pressure strip, the sealing plate, and the first partition in sequence and are threadedly connected to the nut. A sealing plate and a pressure strip are sequentially provided at the upper front and lower rear ends of the second partition. Bolts pass through the pressure strip, the sealing plate, and the second partition in sequence and are threadedly connected to the nut. The sealing plate protrudes from the ends of the first and second partitions and elastically presses against the inner wall of the housing.

4. The tube bundle according to claim 1, characterized in that, The tube bundle also includes: A reverse flange ring is fixedly connected to the right side of the floating tube sheet; The floating head cover is bolted to the right end of the reverse flange ring and seals the reverse flange ring.

5. The tube bundle according to claim 1, characterized in that, The first partition is welded to the fixed tube sheet and the floating tube sheet on its left and right sides, respectively, and the second partition is welded to the fixed tube sheet on its left side.

6. The tube bundle according to claim 1, characterized in that: The first partition plate is welded to the second partition plate.

7. A water preheater, characterized in that, The water preheater includes: The shell is a hollow structure with an opening on the left and a closing on the right. A heating water inlet is located at the upper front end, and a heating water outlet is located at the upper rear end. The tube bundle as described in any one of claims 1 to 6 is sleeved inside the housing; The tube box is a hollow structure that is closed at the left end and open at the right end. It is located on the left side of the tube bundle. The tube box, the fixed tube plate, and the shell are bolted together. A partition plate is vertically installed inside the tube box, which divides the interior of the tube box into two cavities. The upper front end of the tube box is provided with a heated water inlet, and the upper rear end of the tube box is provided with a heated water outlet. The heated water inlet is connected to one of the cavities, and the heated water outlet is connected to the other cavity.

8. The water preheater according to claim 7, characterized in that: Saddles are provided on the left and right sides of the lower end of the shell.

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