Power plant high-temperature dry steam waste heat recovery heat exchange device

Abstract

The utility model relates to the related technical field of power plant steam waste heat recovery and heat exchange devices, in particular to a power plant high-temperature dry steam waste heat recovery and heat exchange device which comprises a tube shell, two hot fluid outlets, a cold fluid inlet tube and a tube plate assembling assembly. The two hot fluid outlets are fixedly connected to the two sides of the bottom end of the pipe shell respectively, a cold fluid inlet pipe is installed at the pipe end of one end of the pipe shell, a cold fluid inlet pipe is arranged at the movable installation position of the pipe plate assembling assembly, and the pipe sleeve on the cleaning disc can be tightly attached to the pipe plate of the pipe set and slide, so that the cleaning disc can be used for cleaning the pipe set. When high-temperature dry steam of a power plant enters the steam waste heat recovery heat exchange device and dust of the high-temperature dry steam of the power plant is attached to the tube plate of the heat exchange device, the tube sleeve is attached to the surface of the tube plate of the tube set through the cleaning disc for cleaning and scraping, and the surface of the tube plate of the tube set is prevented from being corroded by dirt and dust.

Description

Technical Field

[0001] The utility model relates to the technical field related to power plant steam waste heat recovery and heat exchange devices, in particular to a power plant high-temperature dry steam waste heat recovery and heat exchange device. Background Art

[0002] The power plant steam waste heat recovery heat exchange device can recover steam waste heat. A refrigerant low-temperature return water smoke water heat exchange device is installed at the end of the smoke pipe of the steam generator of the power plant steam. In order to improve the recovery effect, it is necessary to ensure that the temperature of the refrigerant return water is 10-20℃. After being heated by the flue gas, the temperature is higher than 40℃. At this time, the temperature of the flue gas will decrease, and a large amount of condensed water will condense on the surface of the heat exchanger. The two ends of the heat exchanger tube bundle are fixed on the tube sheet. The two hot and cold fluids for heat exchange, one flows in the tube, called the tube-side fluid; the other flows outside the tube, called the shell-side fluid. Usually, several baffles are installed in the shell. The baffles can increase the shell-side fluid velocity, forcing the fluid to pass through the tube bundle multiple times according to the specified distance, and enhance the turbulence of the fluid.

[0003] After the existing power plant steam waste heat recovery heat exchanger enters the power plant's high-temperature dry steam, the power plant's high-temperature dry steam dust adheres to the tube sheet of the heat exchanger, causing corrosion damage. The heat exchanger adopts a welded integrated structure, which is difficult to clean internally and disassemble as a whole, greatly reducing the service life of the power plant steam waste heat recovery heat exchanger. Utility Model Content

[0004] The purpose of the utility model is to provide a power plant high-temperature dry steam waste heat recovery heat exchange device to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A heat exchange device for recovering waste heat from high-temperature dry steam in a power plant, comprising a tube shell, a hot fluid outlet and a cold fluid inlet pipe, and a tube sheet assembly component, wherein two hot fluid outlets are fixed at the tube opening at the bottom end of the tube shell, and the two hot fluid outlets are respectively fixedly connected to the two sides of the bottom end of the tube shell, a cold fluid inlet pipe is installed at the tube end at one end of the tube shell, and a cold fluid inlet pipe is arranged at a movable installation position on the tube sheet assembly component, and further comprising,

[0007] A tube sheet cleaning assembly is installed on the tube shell;

[0008] A tube sheet replacement assembly is arranged on the cold fluid inlet pipe and is used for tube-shell butt connection assembly;

[0009] Among them, a tube group is movably installed around the tube inside the tube shell, a fixed flange is fixedly installed in the middle of the tube shell, rail grooves are arranged on both sides of the fixed flange, and a hot fluid inlet and a high-temperature dry steam inlet of a power plant are respectively installed at both ends of the rail groove. A threaded pipe sleeve is arranged on one side of the high-temperature dry steam inlet of the power plant, and the threaded pipe sleeve is threadedly connected to one end of the tube shell.

[0010] The power plant high-temperature dry steam waste heat recovery and heat exchange device as described above: the tube sheet assembly component includes a pneumatic cylinder tube rack movably mounted on a threaded tube sleeve, and the pneumatic cylinder tube rack is fastened to one end of the tube shell through a threaded tube sleeve.

[0011] The power plant high-temperature dry steam waste heat recovery and heat exchange device as described above: the tube group is inserted into the tube shell through the cold fluid inlet pipe.

[0012] The power plant high-temperature dry steam waste heat recovery and heat exchange device as described above: the tube sheet cleaning assembly includes a cleaning plate movably mounted at one end of the tube group, and the tube sleeve on the cleaning plate is sleeved on the outside of the tube group.

[0013] The power plant high-temperature dry steam waste heat recovery and heat exchange device as described above: the tube sheet cleaning assembly also includes a telescopic rod fixedly connected to the middle of the cleaning plate, and the telescopic rod can slide through the air pressure of the pneumatic cylinder pipe rack.

[0014] The high-temperature dry steam waste heat recovery and heat exchange device of the power plant as described above: the tube sheet replacement assembly includes a sealing end movably installed at the top end of the cold fluid inlet pipe, which is used to seal and block the cold fluid inlet to prevent leakage of the cold fluid.

[0015] The high-temperature dry steam waste heat recovery and heat exchange device of the power plant as described above: the tube sheet replacement assembly also includes a built-in fastening disk movably installed in the middle of the cold fluid inlet pipe, and the cold fluid inlet pipe is threadedly fastened in the tube of the tube shell through the built-in fastening disk.

[0016] Compared with the prior art, the beneficial effects of the utility model are: the pipe sleeve on the cleaning disk can fit tightly on the tube sheet of the tube group and slide. When the steam waste heat recovery heat exchange device enters the high-temperature dry steam of the power plant, and the high-temperature dry steam dust of the power plant adheres to the tube sheet of the heat exchange device, the pipe sleeve is fitted on the surface of the tube sheet of the tube group through the cleaning disk to clean and scrape it to prevent stains and dust from corroding the surface of the tube sheet of the tube group.

[0017] The tube sheet of the tube group is assembled in the tube shell and tube through the built-in fastening plate, and the heat exchange device is changed to adopt a welded integrated structure. The tube sheet of the tube group is fastened and installed through the built-in fastening plate, and the internal cleaning can be carried out. The built-in fastening plate on the cold fluid inlet pipe can be threaded and separated for overall disassembly and replacement, which can increase the service life of the power plant steam waste heat recovery heat exchange device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a structural schematic diagram of the tube sheet cleaning assembly of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the tube sheet replacement assembly of the utility model.

[0021] In the figure: 1. Tube shell; 2. Hot fluid outlet; 3. Cold fluid inlet pipe; 4. Tube group; 5. Hot fluid inlet; 6. Rail groove; 7. Fixed flange; 8. High-temperature dry steam inlet of power plant; 9. Threaded pipe sleeve; 10. Pneumatic cylinder pipe rack; 11. Cleaning plate; 12. Pipe sleeve; 13. Telescopic rod; 14. Sealing end; 15. Built-in fastening plate. DETAILED DESCRIPTION

[0022] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0023] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0024] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0025] See also Figures 1 to 3 , a power plant high-temperature dry steam waste heat recovery heat exchange device is proposed, including a tube shell 1, a hot fluid outlet 2 and a cold fluid inlet tube 3 and a tube sheet assembly component.

[0026] Two hot fluid outlets 2 are fixed at the pipe opening at the bottom end of the tube shell 1, and the two hot fluid outlets 2 are respectively fixedly connected to the two sides of the bottom end of the tube shell 1. A cold fluid inlet pipe 3 is installed at the tube end at one end of the tube shell 1. A cold fluid inlet pipe 3 is provided at the movable installation position on the tube sheet assembly component. The tube sheet cleaning component is installed on the tube shell 1; the tube sheet replacement component is arranged on the cold fluid inlet pipe 3, and is used for the butt connection assembly of the tube shell 1;

[0027] Two hot fluid outlets 2 are fixedly installed at the bottom of the tube shell 1, so that the cold fluid inlet pipe 3 is installed at one end of the tube shell 1. The cold fluid inlet pipe 3 can provide cold fluid for steam waste heat recovery and heat exchange. The two hot fluid outlets 2 can recover and condense the high-temperature dry steam of the power plant and recover and discharge the condensed liquid;

[0028] Among them, a tube group 4 is movably installed around the tube inside the tube shell 1, a fixed flange 7 is fixedly installed in the middle of the tube shell 1, and rail grooves 6 are arranged on both sides of the fixed flange 7. The two ends of the rail groove 6 are respectively installed with a hot fluid inlet 5 and a power plant high-temperature dry steam inlet 8. A threaded pipe sleeve 9 is arranged on one side of the power plant high-temperature dry steam inlet 8, and the threaded pipe sleeve 9 is threadedly connected to one end of the tube shell 1.

[0029] In this embodiment, the fixed flange 7 is fixedly installed in the middle of the tube shell 1, the hot fluid inlet 5 and the power plant high-temperature dry steam inlet 8 are respectively fixed on both sides of the top of the tube shell 1, and the high-temperature dry steam of the power plant is injected and transported. The threaded pipe sleeve 9 can be threadedly fastened on one end of the tube shell 1 for additional installation. The tube group 4 can be distributed inside the tube shell 1. When the high-temperature dry steam of the power plant is injected and transported to the inside of the tube shell 1, the tube group 4 can provide cold fluid through the cold fluid inlet pipe 3 for steam waste heat recovery and heat exchange. The high-temperature dry steam of the power plant is condensed on the tube plate of the tube group 4 after being cooled, and then the condensed liquid of the high-temperature dry steam of the power plant can be discharged through the two hot fluid outlets 2.

[0030] Please refer to Figure 1 In this embodiment, the tube sheet assembly component includes a pneumatic cylinder tube rack 10 movably mounted on a threaded tube sleeve 9, and the pneumatic cylinder tube rack 10 is fastened to one end of the tube shell 1 through the threaded tube sleeve 9.

[0031] The pneumatic cylinder pipe rack 10 is fastened to one end of the tube shell 1 through the threaded pipe sleeve 9. When the pipe group 4 on the cold fluid inlet pipe 3 is installed at one end of the tube shell 1, the pneumatic cylinder pipe rack 10 is fastened and fixed through the threaded pipe sleeve 9.

[0032] Preferably, the tube group 4 is inserted into the tube shell 1 through the cold fluid inlet pipe 3. When the high-temperature dry steam of the power plant is poured into the tube shell 1, the tube group 4 is threadedly fastened through the cold fluid inlet pipe 3 and inserted into the tube shell 1. The tube group 4 can be distributed and installed around the inside of the tube shell 1, and the high-temperature dry steam of the power plant can flow around the tube group 4. The tube group 4 can recover the waste heat of the high-temperature dry steam of the power plant inside for heat exchange treatment.

[0033] Please refer to Figure 1 and Figure 2 In this embodiment, the tube sheet cleaning assembly includes a cleaning disk 11 movably mounted at one end of the tube group 4 , and a tube sleeve 12 on the cleaning disk 11 is sleeved on the outside of the tube group 4 .

[0034] The cleaning plate 11 is mounted on the outside of the tube group 4 through the tube sleeve 12. The tube sleeve 12 can fit tightly on the outside of the tube group 4, and the tube group 4 can be fixedly installed to prevent the tube group 4 from directly contacting the tube wall of the tube shell 1. The tube group 4 can fully contact the high-temperature dry steam of the power plant to perform steam waste heat recovery and heat exchange treatment.

[0035] Please refer to Figure 1 and Figure 2 In this embodiment, the tube sheet cleaning assembly also includes a telescopic rod 13 fixedly connected to the middle of the cleaning disk 11, and the telescopic rod 13 can slide by being driven by the pneumatic cylinder tube rack 10.

[0036] The telescopic rod 13 is fixedly connected to the middle part of the cleaning disk 11. Driven by the air pressure of the pneumatic cylinder pipe rack 10, the telescopic rod 13 can push the cleaning disk 11 to slide, and the pipe sleeve 12 on the cleaning disk 11 can fit tightly on the tube sheet of the tube group 4 and slide. When the steam waste heat recovery heat exchange device enters the high-temperature dry steam of the power plant, and the dust of the high-temperature dry steam of the power plant adheres to the tube sheet of the heat exchange device, the pipe sleeve 12 fits on the surface of the tube sheet of the tube group 4 through the cleaning disk 11 to clean and scrape it to prevent stains and dust from corroding the surface of the tube sheet of the tube group 4.

[0037] Please refer to Figure 1 and Figure 3 In this embodiment, the tube sheet replacement assembly includes a sealing end 14 movably mounted on the top of the cold fluid inlet pipe 3, which is used to seal and block the cold fluid inlet to prevent leakage of the cold fluid.

[0038] The sealing end 14 is fixedly mounted on the top of the cold fluid inlet pipe 3 , and the sealing end 14 can seal the cold fluid inlet pipe 3 and the cold fluid delivery end to prevent leakage of the cold fluid delivery.

[0039] Please refer to Figure 1 and Figure 3 In this embodiment, the tube sheet replacement assembly also includes a built-in fastening plate 15 movably installed in the middle of the cold fluid inlet pipe 3, and the cold fluid inlet pipe 3 is threadedly fastened in the tube of the tube shell 1 through the built-in fastening plate 15.

[0040] The built-in fastening plate 15 is movably installed on the cold fluid inlet pipe 3, and the cold fluid inlet pipe 3 is threadedly fastened in the tube of the tube shell 1 through the built-in fastening plate 15, so that the tube sheets of the tube group 4 are respectively threadedly assembled on the built-in fastening plate 15, and the tube sheets of the tube group 4 are assembled in the tube of the tube shell 1 through the built-in fastening plate 15, and the heat exchange device is changed to adopt a welded integrated structure. The tube sheets of the tube group 4 are fastened and installed through the built-in fastening plate 15, and the internal cleaning can be carried out. The built-in fastening plate 15 on the cold fluid inlet pipe 3 can be threadedly separated and disassembled as a whole for replacement, which can improve the service life of the power plant steam waste heat recovery heat exchange device.

[0041] As can be seen from the above, the tube group 4 can be distributed inside the tube shell 1. When the high-temperature dry steam of the power plant is injected into and transported to the inside of the tube shell 1, the tube group 4 can provide cold fluid for steam waste heat recovery and heat exchange through the cold fluid inlet pipe 3. The high-temperature dry steam of the power plant is condensed on the tube sheet of the tube group 4 after being cooled. The pipe sleeve 12 can fit tightly on the outside of the tube group 4, and the tube group 4 can be fixedly installed to avoid direct contact between the tube group 4 and the tube wall of the tube shell 1. The tube group 4 can fully contact with the high-temperature dry steam of the power plant.

[0042] The tube sheets of the tube group 4 are respectively threadedly assembled on the built-in fastening plate 15, and the tube sheets of the tube group 4 are assembled in the tube of the tube shell 1 through the built-in fastening plate 15, changing the heat exchange device to adopt a welded integrated structure, and the tube sheets of the tube group 4 are fastened and installed through the built-in fastening plate 15, and the interior can be cleaned.

[0043] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A heat exchange device for recovering waste heat from high-temperature dry steam in a power plant, comprising a tube shell (1), a hot fluid outlet (2), a cold fluid inlet pipe (3), and a tube sheet assembly component, wherein two hot fluid outlets (2) are fixed at the tube opening at the bottom end of the tube shell (1), and the two hot fluid outlets (2) are respectively fixedly connected to the two sides of the bottom end of the tube shell (1), a cold fluid inlet pipe (3) is installed at the tube end at one end of the tube shell (1), and the cold fluid inlet pipe (3) is arranged on the tube sheet assembly component, characterized in that: Also includes A tube sheet cleaning assembly, mounted on the tube shell (1); A tube sheet replacement assembly, arranged on the cold fluid inlet tube (3) and used for butt connection assembly of the tube shell (1); Wherein, a tube group (4) is movably installed around the tube inside the tube shell (1), a fixed flange (7) is fixedly installed in the middle of the tube shell (1), rail grooves (6) are arranged on both sides of the fixed flange (7), and a hot fluid inlet (5) and a power plant high-temperature dry steam inlet (8) are respectively installed at both ends of the rail groove (6), and a threaded pipe sleeve (9) is arranged on one side of the power plant high-temperature dry steam inlet (8), and the threaded pipe sleeve (9) is threadedly connected to one end of the tube shell (1).

2. A power plant high-temperature dry steam waste heat recovery and heat exchange device according to claim 1, characterized in that: The tube sheet assembly component comprises a pneumatic cylinder tube rack (10) movably mounted on a threaded tube sleeve (9); the pneumatic cylinder tube rack (10) is fastened to one end of the tube shell (1) via the threaded tube sleeve (9).

3. The power plant high-temperature dry steam waste heat recovery and heat exchange device according to claim 1, characterized in that: The tube group (4) is inserted into the tube shell (1) through the cold fluid inlet pipe (3).

4. The power plant high-temperature dry steam waste heat recovery and heat exchange device according to claim 1, characterized in that: The tube sheet cleaning assembly comprises a cleaning disc (11) movably mounted on one end of the tube group (4); a tube sleeve (12) is provided on the cleaning disc (11); and the tube sleeve (12) is sleeved on the outside of the tube group (4).

5. A power plant high-temperature dry steam waste heat recovery and heat exchange device according to claim 4, characterized in that: The tube sheet cleaning assembly also includes a telescopic rod (13) fixedly connected to the middle of the cleaning plate (11), and the telescopic rod (13) is driven by the pneumatic cylinder tube rack (10) to slide.

6. The power plant high-temperature dry steam waste heat recovery and heat exchange device according to claim 1, characterized in that: The tube sheet replacement assembly comprises a sealing end (14) movably mounted on the top end of the cold fluid inlet pipe (3) and used for sealing and blocking the cold fluid inlet to prevent leakage of the cold fluid.

7. A power plant high-temperature dry steam waste heat recovery and heat exchange device according to claim 6, characterized in that: The tube sheet replacement assembly further comprises a built-in fastening disc (15) movably mounted in the middle of the cold fluid inlet pipe (3), and the cold fluid inlet pipe (3) is threadedly fastened in the tube shell (1) via the built-in fastening disc (15).

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