Falling film absorption cooler

Abstract

The utility model discloses a falling film absorption cooler which comprises a shell, a liquid phase inlet, a gas phase inlet and an outlet are formed in the shell, two tube plates are arranged in the shell, and a heat exchange tube is arranged between the two tube plates. A plurality of tube holes are formed in the tube plate, the inner wall surfaces of the tube holes comprise first matching cylindrical surfaces and second matching cylindrical surfaces, and annular steps are arranged between the first matching cylindrical surfaces and the second matching cylindrical surfaces; locking nuts are in threaded fit with the first matching cylindrical surfaces, and the two ends of the heat exchange tubes are inserted into the corresponding second matching cylindrical surfaces and then enter inner holes of the locking nuts; a fastening sealing piece is arranged between the outer wall of the heat exchange tube and the first matched cylindrical face, and a film distributor is arranged in a tube hole of the tube plate located on the upper portion and is in threaded connection with the first matched cylindrical face. According to the utility model, the connection between the heat exchange tube and the tube plate is realized through the locking nut and the fastening sealing piece, so that the problem of connection between the tube plate made of the polytetrafluoroethylene material and the heat exchange tube made of the silicon carbide material is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange equipment, and particularly relates to a falling film absorption cooler. Background Art

[0002] Falling film absorption coolers are widely used in industries such as petrochemicals, light industry, metallurgy and refrigeration. Their structure usually includes a shell with a liquid phase inlet and a gas phase inlet arranged on the top of the shell. Upper and lower tube sheets are arranged inside the shell, and a number of heat exchange tubes are arranged between the two tube sheets. The heat exchange tubes and the tube sheets are welded together. An outlet is arranged at the bottom of the shell, and a film distributor is arranged at the top of the heat exchanger to improve the film-forming effect of the liquid film in the heat exchange tubes.

[0003] With the application of falling film absorption coolers in corrosive media, the internal tube sheets are made of PTFE materials and the heat exchange tubes are made of silicon carbide materials. Since both PTFE materials and silicon carbide materials are non-metallic materials, the tube sheets and heat exchange tubes cannot be connected by welding.

[0004] Based on the above problems, the present application proposes a falling film absorption cooler, in which the tube sheet and the heat exchange tube are connected by locking nuts and fastening seals, thereby solving the connection problem between the tube sheet made of polytetrafluoroethylene material and the heat exchange tube made of silicon carbide material. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a falling film absorption cooler.

[0006] A falling film absorption cooler comprises a shell, a liquid phase inlet and a gas phase inlet are provided at the top of the shell, an outlet is provided at the bottom of the shell, two tube sheets are provided in parallel with each other in the upper and lower parts of the shell, and a plurality of heat exchange tubes are provided between the two tube sheets;

[0007] The tube sheet is provided with a plurality of tube holes for mating with the heat exchange tubes, and the tube holes on the two tube sheets are symmetrically structured; the inner wall surface of the tube hole includes a first mating cylindrical surface and a second mating cylindrical surface, the diameter of the first mating cylindrical surface is larger than the diameter of the second mating cylindrical surface, and an annular step is provided between the first mating cylindrical surface and the second mating cylindrical surface;

[0008] The first matching cylindrical surface is threadedly fitted with a locking nut, and both ends of the heat exchange tube are inserted into the corresponding second matching cylindrical surface and then into the inner hole of the locking nut;

[0009] A fastening seal is provided between the outer wall of the heat exchange tube and the first matching cylindrical surface, and the fastening seal is located between the end face of the locking nut and the annular step;

[0010] A film distributor is arranged in the tube hole of the upper tube plate, and the film distributor is threadedly connected to the first matching cylindrical surface.

[0011] Preferably, the fastening seal comprises a plurality of sealing rings.

[0012] Preferably, an annular baffle is provided at one end of the locking nut close to the corresponding membrane distributor, and the inner diameter of the annular baffle is smaller than the outer diameter of the heat exchange tube.

[0013] Preferably, a plurality of distribution grooves penetrating the wall are evenly arranged along the circumferential direction at the end of the membrane distributor extending out of the tube sheet, and the inner wall surface of the membrane distributor facing the locking nut is a frustum, and the small end of the frustum faces the end of the membrane distributor where the distribution grooves are located.

[0014] Preferably, the angle between the generatrix of the frustum and the central axis is 15° to 45°.

[0015] Preferably, a gas phase inlet is provided at the center of the top of the shell, and a plurality of liquid phase inlets are evenly provided around the gas phase inlet on the top of the shell;

[0016] A spherical spray head is provided at the liquid outlet end of the liquid phase inlet, and a plurality of spray holes are provided on the spherical surface of the spherical spray head.

[0017] Preferably, three liquid phase inlets are evenly arranged on the top of the shell around the gas phase inlet.

[0018] Preferably, the shell includes an upper shell, a cylinder, and a lower shell that are coaxially connected. The gas phase inlet and the liquid phase inlet are arranged on the upper shell, and the outlet is arranged on the lower shell.

[0019] Preferably, flanges are provided at the lower end of the upper shell, the axial ends of the cylinder, and the upper end of the lower shell;

[0020] The upper tube sheet is located between the upper shell and the cylinder, and the upper tube sheet and the corresponding two flanges are fastened together by bolts;

[0021] The lower tube sheet is located between the cylinder and the lower shell, and the lower tube sheet is fastened to the corresponding two flanges by bolts.

[0022] Preferably, a sealing gasket with an annular structure is provided between the tube sheet and the corresponding flange.

[0023] The beneficial effects of the utility model are:

[0024] (1) In the present invention, the connection between the heat exchange tube and the tube sheet is achieved by locking nuts and fastening seals, and welding is no longer required, thereby solving the connection problem between the tube sheet made of polytetrafluoroethylene material and the heat exchange tube made of silicon carbide material, so that the cooler of the present application can be applied to corrosive media and non-corrosive media, and has a wide range of applications.

[0025] (2) The arrangement of the spray head in the present invention allows the incoming liquid to be fully distributed to the tube sheet and the membrane distributor from different angles through the spray head. During the entry process, the liquid pre-contacts the gas filled in the shell space in the form of a jet. At this time, part of the gas will be absorbed, thereby enhancing the gas absorption effect.

[0026] (3) The film distributor in the present invention is threadedly matched with the tube sheet, which is stable and reliable and not easy to fall off; the annular baffle redistributes the liquid film for a second time, and finally enters the inner wall of the heat exchange tube to form a more stable liquid film. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0028] Figure 1 This is a schematic front view of the structure of the falling film absorption cooler of the utility model;

[0029] Figure 2 This is a schematic top view of the structure of the falling film absorption cooler of the utility model;

[0030] Figure 3 This is a structural diagram of the membrane distributor in the utility model;

[0031] Figure 4 This is an axial cross-sectional view of the membrane distributor in the present invention;

[0032] Figure 5 It is a structural diagram of the locking nut in the utility model;

[0033] Figure 6 This is a schematic diagram of the cooperation between the two tube sheets and the heat exchange tubes in the utility model;

[0034] Figure 7 This is a schematic diagram of the structure of the tube holes on the tube plate of the utility model;

[0035] Figure 8 This is a schematic diagram of the cooperation between the membrane distributor, the locking nut and the upper tube sheet in the utility model;

[0036] Figure 9 This is a schematic diagram of the cooperation between the locking nut and the lower tube plate in the utility model;

[0037] Figure 10 It is a structural diagram of the sprinkler head in the utility model;

[0038] in:

[0039] 1-liquid inlet, 2-gas inlet, 3-outlet, 4-tube sheet, 41-first matching cylindrical surface, 42-second matching cylindrical surface, 43-annular step, 5-heat exchange tube, 6-locking nut, 61-annular baffle, 7-fastening seal, 8-membrane distributor, 81-distribution groove, 82-round table, 9-spray head, 91-spray hole, 10-upper shell, 11-cylinder, 12-lower shell, 13-flange, 14-sealing gasket. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] See attached Figures 1-10 A falling film absorption cooler comprises a shell, a liquid phase inlet 1 and a gas phase inlet 2 are provided at the top of the shell, an outlet 3 is provided at the bottom of the shell, two tube sheets 4 are provided in parallel with each other in the upper and lower directions inside the shell, and a plurality of heat exchange tubes 5 are provided between the two tube sheets 4;

[0042] The tube sheet 4 is provided with a plurality of tube holes for mating with the heat exchange tubes 5. The tube holes on the two tube sheets 4 are symmetrically structured. The inner wall surface of the tube hole includes a first mating cylindrical surface 41 and a second mating cylindrical surface 42. The diameter of the first mating cylindrical surface 41 is larger than the diameter of the second mating cylindrical surface 42. An annular step 43 is provided between the first mating cylindrical surface 41 and the second mating cylindrical surface 42.

[0043] The first matching cylindrical surface 41 is threadedly fitted with a locking nut 6. The two ends of the heat exchange tube 5 are inserted into the corresponding second matching cylindrical surface 42 and then into the inner hole of the locking nut 6.

[0044] A fastening seal 7 is provided between the outer wall of the heat exchange tube 5 and the first matching cylindrical surface 41 , and the fastening seal 7 is located between the end surface of the locking nut 6 and the annular step 43 ;

[0045] A film distributor 8 is provided in the tube hole of the upper tube sheet 4 , and the film distributor 8 is threadedly connected to the first matching cylindrical surface 41 .

[0046] In the present application, the connection between the heat exchange tube 5 and the tube sheet 4 is achieved through the locking nut 6 and the fastening seal 7, and there is no need to connect by welding, thereby solving the connection problem between the tube sheet of polytetrafluoroethylene material and the heat exchange tube of silicon carbide material.

[0047] The fastening seal 7 includes a plurality of sealing rings.

[0048] An annular baffle 61 is provided at one end of the locking nut 6 close to the corresponding film distributor 8 . The inner diameter of the annular baffle 61 is smaller than the outer diameter of the heat exchange tube 5 to prevent the heat exchange tube 5 from escaping from the tube hole.

[0049] The end of the membrane distributor 8 extending out of the tube sheet 4 is evenly provided with a number of distribution grooves 81 penetrating the wall along the circumferential direction. The inner wall surface of the membrane distributor 8 facing the locking nut 6 is a frustum 82, and the small end of the frustum 82 faces the end of the membrane distributor 8 where the distribution grooves 81 are located.

[0050] The included angle between the generatrix of the frustum surface 82 and the central axis is 15° to 45°.

[0051] A gas phase inlet 2 is provided at the center of the top of the shell, and a plurality of liquid phase inlets 1 are evenly provided around the gas phase inlet 2 on the top of the shell;

[0052] A spherical spray head 9 is provided at the liquid outlet end of the liquid phase inlet 1 , and a plurality of spray holes 91 are provided on the spherical surface of the spherical spray head 9 so that the liquid can be sprayed onto the tube sheet 4 from different angles through the spray head 91 .

[0053] Three liquid phase inlets 1 are evenly arranged around the gas phase inlet 2 on the top of the shell.

[0054] The shell includes an upper shell 10 , a cylinder 11 , and a lower shell 12 that are coaxially connected. The gas phase inlet 2 and the liquid phase inlet 1 are arranged on the upper shell 10 , and the outlet 3 is arranged on the lower shell 12 .

[0055] Flanges 13 are provided at the lower end of the upper shell 10, the axial ends of the cylinder 11, and the upper end of the lower shell 12;

[0056] The upper tube sheet 4 is located between the upper shell 10 and the cylinder 11, and the upper tube sheet 4 is fastened to the corresponding two flanges 13 by bolts;

[0057] The lower tube sheet 4 is located between the cylinder 11 and the lower shell 12 , and the lower tube sheet 4 is fastened to the corresponding two flanges 13 by bolts.

[0058] A sealing gasket 14 with an annular structure is provided between the tube sheet 4 and the corresponding flange 13 .

[0059] In the utility model, gas phase enters by gas phase entrance 2, the gas that enters diffuses from the center to the periphery, liquid phase enters by multiple liquid phase entrances 1, the liquid that enters is fully distributed to tube sheet 4 and membrane distributor 8 from different angles by spray head 9, the liquid is in the process of entering and is pre-contacted with the gas filled in the shell space in jet flow, the gas will be partly absorbed at this moment, and the absorption effect of the gas is enhanced. The liquid flowing into membrane distributor 8 forms liquid film on the inner surface of membrane distributor 8, the liquid film is smoothly transitioned to annular baffle 61 above lock nut 6 by circular platform 82, annular baffle 61 carries out second redistribution to the liquid film, and finally enters the inner wall of heat exchange pipe 5, and forms more stable liquid film. The gas passes through the space without liquid in the center of membrane distributor 8 and enters heat exchange pipe 5, and is fully contacted with the liquid film on the inner wall of heat exchange pipe 5, and the gas is absorbed. The liquid phase that has absorbed the gas is finally discharged from outlet 3.

[0060] Although the specific embodiments of the utility model have been described in combination with the drawings, it is not a limitation to the utility model, and the skilled in the art should understand that various modifications or changes made by the skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.

Claims

1. A falling film absorption cooler, comprising a shell, wherein a liquid phase inlet (1) and a gas phase inlet (2) are provided at the top of the shell, an outlet (3) is provided at the bottom of the shell, two tube sheets (4) arranged in parallel up and down are provided inside the shell, and a plurality of heat exchange tubes (5) are provided between the two tube sheets (4); characterized in that: The tube sheet (4) is provided with a plurality of tube holes for matching with the heat exchange tubes (5), and the tube holes on the two tube sheets (4) are symmetrically structured; the inner wall surface of the tube hole includes a first matching cylindrical surface (41) and a second matching cylindrical surface (42); the diameter of the first matching cylindrical surface (41) is larger than the diameter of the second matching cylindrical surface (42); and an annular step (43) is provided between the first matching cylindrical surface (41) and the second matching cylindrical surface (42); The first matching cylindrical surface (41) is threadedly fitted with a locking nut (6), and both ends of the heat exchange tube (5) are inserted into the corresponding second matching cylindrical surface (42) and then enter the inner hole of the locking nut (6); A fastening seal (7) is provided between the outer wall of the heat exchange tube (5) and the first matching cylindrical surface (41), and the fastening seal (7) is located between the end surface of the locking nut (6) and the annular step (43); A membrane distributor (8) is provided in the tube hole of the upper tube plate (4), and the membrane distributor (8) is threadedly connected to the first matching cylindrical surface (41).

2. The falling film absorption cooler according to claim 1, characterized in that The fastening seal (7) comprises a plurality of sealing rings.

3. The falling film absorption cooler according to claim 1, characterized in that An annular baffle (61) is provided at one end of the locking nut (6) close to the corresponding membrane distributor (8), and the inner diameter of the annular baffle (61) is smaller than the outer diameter of the heat exchange tube (5).

4. The falling film absorption cooler according to claim 1, characterized in that The end of the membrane distributor (8) extending out of the tube sheet (4) is evenly provided with a plurality of distribution grooves (81) penetrating the wall along the circumferential direction. The inner wall surface of the membrane distributor (8) facing the locking nut (6) is a frustum (82), and the small end of the frustum (82) faces the end of the membrane distributor (8) where the distribution grooves (81) are located.

5. The falling film absorption cooler according to claim 4, characterized in that The included angle between the generatrix of the frustum (82) and the central axis is 15° to 45°.

6. The falling film absorption cooler according to claim 1, wherein: A gas phase inlet (2) is provided at the center of the top of the shell, and a plurality of liquid phase inlets (1) are evenly provided around the gas phase inlet (2) on the top of the shell; A spherical spray head (9) is provided at the liquid outlet end of the liquid phase inlet (1), and a plurality of spray holes (91) are provided on the spherical surface of the spherical spray head (9).

7. The falling film absorption cooler according to claim 6, characterized in that Three liquid phase inlets (1) are evenly arranged around the gas phase inlet (2) on the top of the shell.

8. The falling film absorption cooler according to claim 1, wherein The shell comprises an upper shell (10), a cylinder (11), and a lower shell (12) which are coaxially connected. The gas phase inlet (2) and the liquid phase inlet (1) are arranged on the upper shell (10), and the outlet (3) is arranged on the lower shell (12).

9. The falling film absorption cooler according to claim 8, characterized in that Flanges (13) are provided at the lower end of the upper shell (10), the axial ends of the cylinder (11), and the upper end of the lower shell (12); The upper tube sheet (4) is located between the upper shell (10) and the cylinder (11), and the upper tube sheet (4) is fastened to the corresponding two flanges (13) by bolts; The lower tube plate (4) is located between the cylinder (11) and the lower shell (12), and the lower tube plate (4) is fastened to the corresponding two flanges (13) by bolts.

10. The falling film absorption cooler according to claim 9, characterized in that A sealing gasket (14) in an annular structure is provided between the tube plate (4) and the corresponding flange (13).

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