A cartridge-type heat exchanger

Abstract

The utility model discloses a kind of removable packing gland type heat exchangers, including shell and pipe box being installed at both ends of shell, the position inside shell close to both ends is slidably installed with tube sheet respectively, through-penetration communication pipe bundle is installed between two tube sheets, packing groove is set on the circumference of the side of tube sheet deviating from pipe bundle, sealing packing is filled in packing groove, the pressure disc of tube sheet side deviating from pipe bundle is slidably connected in the inside of shell, and pressure disc is installed in the side of tube sheet by fastening bolt.The utility model both ends are provided with detachable pipe box, the tube sheet of pipe bundle both ends in the inside of shell is using packing gland type structure and shell movable installation, adapt to temperature difference expansion influence, avoid thermal stress cracking, tube sheet and pipe bundle whole can be extracted from the inside of shell, cleaning, maintenance and disassembly are carried out in the outside of shell, it is easy to operate, cleaning is thorough, maintenance is simple, maintenance time is saved, especially suitable for the working condition of easy scale formation, need frequent cleaning.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, specifically a removable stuffing box heat exchanger. Background Technology

[0002] In industrial production, shell-and-tube heat exchangers are common heat exchange devices, widely used in petrochemical, pharmaceutical, and food processing industries. Traditional types include fixed tube sheet heat exchangers, U-tube heat exchangers, and stuffed box heat exchangers. However, when handling media prone to scaling, high viscosity, or corrosiveness, traditional heat exchangers have the following problems: In fixed tube sheet heat exchangers, the tube bundles and tube sheets are welded to the shell, resulting in high thermal stress. When the temperature difference is large, the tube sheet is prone to cracking, and the tube bundles cannot be pulled out for cleaning. After scaling, only chemical cleaning can be used, which has limited cleaning effect. The tube bundle of a U-tube heat exchanger can be pulled out, but the U-bend is prone to blockage and has high manufacturing costs. In traditional stuffed box heat exchangers, one tube sheet is fixed while the other is sealed with a stuffed box structure. The tube bundle insertion, installation, sealing, replacement, and maintenance are cumbersome and time-consuming.

[0003] Given the shortcomings of traditional shell-and-tube heat exchangers, a novel removable stuffing box shell-and-tube heat exchanger suitable for conditions prone to scaling and requiring frequent cleaning is proposed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a removable stuffing box heat exchanger suitable for operating conditions that are prone to scaling and require frequent cleaning.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A removable stuffing box heat exchanger includes a shell and tube boxes installed at both ends of the shell. A cold material inlet pipe and a cold material outlet pipe are respectively connected to the top of the tube box at one end of the shell and the bottom of the tube box at the other end of the shell. A hot material outlet pipe and a hot material inlet pipe are respectively connected to the top of the end of the shell corresponding to the cold material inlet pipe and the bottom of the end of the shell corresponding to the cold material outlet pipe. Tube sheets are slidably installed near both ends inside the shell, and a through-tube bundle is installed between the two tube sheets. A packing groove is provided on the circumference of the tube sheet opposite to the tube bundle, and the packing groove is filled with sealing packing. A pressure plate is slidably connected inside the shell to the tube sheet on the side opposite to the tube bundle. The pressure plate is installed on the side of the tube sheet by fastening bolts. A flange provided around the side of the pressure plate is inserted into the packing groove and supported on the side of the sealing packing.

[0006] Preferably, multiple flow-deflecting support baffles are fixedly sleeved at equal intervals on the tube bundle, and the flow-deflecting support baffles are provided with fixing holes at the positions corresponding to the tube bundle.

[0007] Preferably, the flow-deflecting support baffle is slidably connected to the inner wall of the housing, and an overflow port is provided at the top or bottom of the flow-deflecting support baffle, with the overflow ports of two adjacent flow-deflecting support baffles being staggered vertically.

[0008] Preferably, the hot material output pipe and the hot material input pipe are respectively disposed between the corresponding tube sheet and the adjacent baffle support plate.

[0009] Preferably, the housing and the pipe box are connected by a flange and corresponding fixing bolts and nuts.

[0010] Preferably, the distance between the two pressure plate back surfaces is less than the length of the housing.

[0011] Preferably, the inner wall of the tube box at one end of the shell is provided with an annular limiting protrusion.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This utility model features detachable tube boxes at both ends. The tube sheets at both ends of the tube bundle inside the shell are movably installed with the shell using a stuffing box structure to adapt to the effects of temperature difference expansion and avoid thermal stress cracking. The tube sheets and the entire tube bundle can be pulled out from inside the shell for cleaning, maintenance, and disassembly from the outside. It is convenient to operate, cleans thoroughly, and maintains simply, saving maintenance time. It is especially suitable for working conditions that are prone to scaling and require frequent cleaning, achieving a convenient and practical effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the tube bundle, tube sheet, and baffle support structure of this utility model; Figure 4 This is a partial sectional view of the tube sheet and pressure plate of this utility model; Figure 5 This is a side view of the flow-deflecting support baffle of this utility model.

[0014] In the diagram: 1. Shell; 2. Tube box; 3. Cold material inlet pipe; 4. Cold material outlet pipe; 5. Hot material outlet pipe; 6. Hot material inlet pipe; 7. Tube sheet; 8. Tube bundle; 9. Packing groove; 10. Sealing packing; 11. Pressure plate; 12. Fastening bolts; 13. Baffle support baffle; 14. Fixing hole; 15. Overflow port; 16. Flange; 17. Annular limiting protrusion. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1-5 As shown, this utility model provides a technical solution: a removable stuffing box heat exchanger, including a shell 1 and tube boxes 2 installed at both ends of the shell 1. The shell 1 and the tube boxes 2 are connected by flanges 16 and corresponding fixing bolts and nuts, which facilitates disassembly and cleaning and maintenance. The inner wall of the tube box 2 corresponding to one end of the shell 1 is provided with an annular limiting protrusion 17 to limit the position of the pressure plate 11, ensuring that the tube sheet 7 is always located inside the shell 1, and ensuring the sealing effect of the sealing packing 10. The top of one end of the casing 1 and the bottom of the other end of the casing 2 are respectively connected to a cold material input pipe 3 and a cold material output pipe 4. The top of the end of the casing 1 corresponding to the cold material input pipe 3 and the bottom of the end of the casing 1 corresponding to the cold material output pipe 4 are respectively connected to a hot material output pipe 5 and a hot material input pipe 6. Tube sheets 7 are slidably installed near both ends inside the shell 1. A tube bundle 8 is installed between the two tube sheets 7. Multiple baffles 13 are fixedly sleeved on the tube bundle 8 at equal intervals. The baffles 13 are provided with fixing holes 14 at the positions corresponding to the tube bundle 8. The baffles 13 are slidably connected to the inner wall of the shell 1. An overflow port 15 is provided at the top or bottom of the baffles 13. The overflow ports 15 of two adjacent baffles 13 are staggered vertically. The hot material output pipe 5 and the hot material input pipe 6 are respectively located between the corresponding tube sheet 7 and the adjacent baffles 13. A packing groove 9 is provided on the circumference of the tube sheet 7 on the side opposite to the tube bundle 8. The packing groove 9 is filled with sealing packing 10. The specific material of the sealing packing 10 is determined according to the physicochemical properties of the cold to be heated, such as flexible graphite, asbestos, polytetrafluoroethylene, etc. Inside the shell 1, a pressure plate 11 is slidably connected to the side of the tube sheet 7 opposite to the tube bundle 8. The pressure plate 11 is installed on the side of the tube sheet 7 by fastening bolts 12. The distance between the opposite surfaces of the two pressure plates 11 is less than the length of the shell 1. A flange provided around the side of the pressure plate 11 is inserted into the packing groove 9 and supported on the side of the sealing packing 10.

[0017] The outer diameter of tube sheet 7 is equal to the inner diameter of shell 1 minus twice the assembly clearance and twice the thermal expansion. The edges of tube sheet 7 are machined with a 15° chamfer to prevent jamming during pulling. The initial compression of sealing packing 10 is 20%–30% (e.g., 10mm thick packing compressed to 7mm). Bolt preload F = K × D × P, in N, generally taken as 0.15–0.2, where K is the coefficient of friction, D is the nominal bolt diameter in mm, and P is the bolt tightening force in MPa. Leakage control allows for a leakage rate of ≤0.1% × design pressure for air tightness test and ≤0.1% × design pressure for liquid tightness test (GB / T). (151-2014) The actual measured pulling force of tube bundle 8 should be ≤0.1×the weight of tube bundle 8. Otherwise, the packing tightness or guide rail alignment needs to be checked. After the initial heating to the working temperature, the machine needs to be stopped and the bolts tightened to eliminate thermal relaxation. When tube bundle 8 is stuck during pulling, it is because the coaxiality of tube sheet 7 and shell 1 is out of tolerance. The roundness of shell 1 needs to be controlled during processing. When the sealing packing 10 leaks too quickly, it is because the bolt preload is uneven. A hydraulic tensioner needs to be used to tighten it synchronously. Before leaving the factory, shell 1 and tube box are tested at 1.5 times the pressure. Helium leak detection is performed on the sealing packing 10. The specific design needs to be combined with the characteristics of the medium such as corrosivity and particulate matter content to adjust the material selection.

[0018] Working principle: Hot fluid is input into the housing 1 through the hot material inlet pipe 6 at the bottom, flows from right to left inside the housing 1, and is output from the hot material outlet pipe 5 at the upper left end of the housing 1 to heat the tube bundle 8. The fluid to be heated is input through the cold material inlet pipe 3 on the left tube box 2, flows from left to right through the tube bundle 8 to the right tube box 2, and is output from the cold material outlet pipe 4 at the bottom of the right tube box 2. Heat exchange is achieved during the flow of hot fluid and fluid to be heated. The tube sheet 7, which houses the tube bundle 8, is slidably connected to the inner wall of the housing 1 and sealed by the sealing packing 10. The sealing packing 10 is fixed by the pressure plate 11, allowing the tube sheet 7 and the housing 1 to slide and expand, adapting to the effects of temperature difference expansion and preventing thermal stress cracking of the tube sheet 7. Both ends of the tube box 2 are detachable, and the tube sheet 7 and the tube bundle 8 can be pulled out from the housing 1 for cleaning, maintenance, and disassembly outside the housing 1. This also facilitates cleaning and maintenance of the tube box 2 and the inside of the housing 1. It is not only easy to operate, but also cleans thoroughly and maintains simply, bringing convenience to use and maintenance.

[0019] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A removable stuffing box heat exchanger, characterized in that: Includes a shell (1) and pipe boxes (2) installed at both ends of the shell (1). The top of the pipe box (2) at one end of the shell (1) and the bottom of the pipe box (2) at the other end are respectively connected to a cold material input pipe (3) and a cold material output pipe (4). The top of the shell (1) corresponding to the cold material input pipe (3) and the bottom of the shell (1) corresponding to the cold material output pipe (4) are respectively connected to a hot material output pipe (5) and a hot material input pipe (6). Tube sheets (7) are slidably installed at both ends of the housing (1). A tube bundle (8) is installed between the two tube sheets (7). A packing groove (9) is provided on the circumference of the tube sheet (7) away from the tube bundle (8). Sealing packing (10) is filled in the packing groove (9). A pressure plate (11) is slidably connected inside the housing (1) on the side of the tube sheet (7) away from the tube bundle (8). The pressure plate (11) is installed on the side of the tube sheet (7) by fastening bolts (12). A flange provided around the side of the pressure plate (11) is inserted into the packing groove (9) and supported on the side of the sealing packing (10).

2. The removable stuffing box heat exchanger according to claim 1, characterized in that: Multiple flow-deflecting support baffles (13) are fixedly sleeved at equal intervals on the tube bundle (8), and the flow-deflecting support baffles (13) are provided with fixing holes (14) at the positions corresponding to the tube bundle (8).

3. A removable stuffing box heat exchanger according to claim 2, characterized in that: The baffle support plate (13) is slidably connected to the inner wall of the shell (1). An overflow port (15) is provided at the top or bottom of the baffle support plate (13). The overflow ports (15) of two adjacent baffle support plates (13) are staggered vertically.

4. A removable stuffing box heat exchanger according to claim 3, characterized in that: The hot material output pipe (5) and the hot material input pipe (6) are respectively arranged between the corresponding tube sheet (7) and the adjacent baffle support plate (13).

5. A removable stuffing box heat exchanger according to claim 1, characterized in that: The housing (1) and the pipe box (2) are connected by a flange (16) and corresponding fixing bolts and fixing nuts.

6. A removable stuffing box heat exchanger according to claim 1, characterized in that: The distance between the opposing surfaces of the two pressure plates (11) is less than the length of the housing (1).

7. A removable stuffing box heat exchanger according to claim 1, characterized in that: The inner wall of the tube box (2) corresponding to one end of the shell (1) is provided with an annular limiting protrusion (17).

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