Tube pass structure for double-component mixed feeding

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a double-component mixed feeding tube pass structure which comprises a main cylinder, a main tube plate, a liquid phase tube box, an auxiliary tube plate and a gas phase tube box which are sequentially arranged, the main cylinder and the main tube plate jointly define a shell pass, and the liquid phase tube box, the main tube plate and the auxiliary tube plate jointly define a liquid phase cavity. A gas-phase chamber is defined by the gas-phase tube box and the auxiliary tube plate; a plurality of heat exchange tubes which are arranged in parallel are arranged in the shell side; the liquid-phase chamber is provided with a plurality of gas-phase distribution pipes, and one end part of each gas-phase distribution pipe is fixed on the auxiliary pipe plate and is communicated with the gas-phase chamber; the other end of each gas-phase distribution pipe is close to the port of the corresponding heat exchange pipe, a preset distance is reserved between the other end of each gas-phase distribution pipe and the gas-phase distribution pipe, the end of each gas-phase distribution pipe is connected with a positioning piece, the ports of the heat exchange pipes limit the positioning pieces in the radial direction, and the heat exchange pipes, the liquid-phase cavity and the gas-phase distribution pipes are communicated. Compared with the prior art, a distance is reserved between the gas phase distribution pipe and the heat exchange pipe, and gas and liquid phases can enter the heat exchange pipe in a smoother and more uniform mixing mode.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, and particularly relates to a tube-side structure for two-component mixed feeding. Background Art

[0002] A shell-and-tube heat exchanger, also known as a tube-type heat exchanger, is a shell-and-tube heat exchanger with the wall surface of the tube bundle enclosed in a shell as the heat transfer surface. This type of heat exchanger has a relatively simple structure, reliable operation, can be made of various structural materials (mainly metal materials), and can be used under high temperature and high pressure. It is the most widely used type at present.

[0003] In industrial installations, during the heating process of materials, due to the high pressure, the saturation point of the materials is very high, resulting in a higher required heat source temperature, which will increase the energy consumption in industrial production by a large amount. If a gas that does not react with the material is added to the material, the partial pressure of the material can be reduced, and the saturation point of the material can be lowered, thereby reducing the temperature of the heat source. Using the conventional method requires mixing the gas-liquid two-phase fluid first and then entering the heat exchange equipment for heat exchange, which requires additional mixing equipment and increases the floor area of the device. Later, there appeared a high-efficiency heat exchanger with gas-liquid two-phase distribution disclosed in the Chinese patent document with the application number 202322868870.8, including a shell, a tube bundle, a lower tube sheet, and an upper tube sheet. Among them, a shell-side material inlet is provided at the upper end of the shell, and a shell-side material outlet is provided at the lower end. The shell is connected to the upper tube sheet and the lower tube sheet through the upper tube plate and the lower tube plate respectively; the tube bundle is composed of heat exchange tubes, and the heat exchange tubes are fixed in the shell through tie rods, baffle plates, and spacer tubes; the lower tube sheet includes a gas-phase tube sheet and a liquid-phase tube sheet. The gas-phase tube sheet is provided with a tube-side gas-phase inlet, and the liquid-phase tube sheet is provided with a tube-side liquid-phase inlet. A gas-liquid separation tube plate is provided between the liquid-phase tube sheet and the gas-phase tube sheet, and a liquid-phase distribution plate is provided in the liquid-phase tube sheet. The gas-phase tube sheet is connected to the heat exchange tubes through gas-phase distribution tubes; a tube-side material outlet is provided at the upper end of the upper tube sheet. The tube-side inlet separates the gas-liquid two-phase and enters, which is beneficial to ensuring the full mixing of the gas-liquid two-phase.

[0004] The gas-phase tube sheet of the prior art is connected to the heat exchange tubes through gas-phase distribution tubes. The gas-phase distribution tubes and the heat exchange tubes are in one-to-one correspondence, and the gas-phase distribution tubes can extend into the lower end of the heat exchange tubes by a distance of 20-200 mm. The annular gap between the gas-phase distribution tubes and the heat exchange tubes can provide a channel for the liquid phase to enter the heat exchange tubes. The tube-side gas-phase material enters from the tube-side gas-phase inlet, and then is distributed into the heat exchange tubes through the gas-phase distribution tubes; the tube-side liquid-phase material enters from the tube-side liquid-phase inlet, is distributed through the liquid-phase distribution plate, and then enters the heat exchange tubes through the annular gap between the gas-phase distribution tubes and the heat exchange tubes, and then the gas-liquid two-phase is mixed.

[0005] The above prior art has areas to be optimized:

[0006] The heat exchange tube has an inner extended heat exchange tube, and the liquid phase enters through the annular gap between the gas distribution tube and the heat exchange tube. ① The gas distribution tube blocks the inlet of the heat exchange tube, and the annular gap is small, which hinders the flow rate of the liquid phase from entering; ② It is difficult to ensure that the gas distribution tube is completely centered inside the heat exchange tube during installation, and the uneven annular gap affects the uniformity of gas-liquid mixing; ③ The section of the gas distribution tube located inside the heat exchange tube has no radial support, and it is easy to shake and cause deformation of its end, thereby affecting the gas phase outflow; ④ The gas distribution tube extends too deep into the heat exchange tube. Especially when the gas distribution tube extends to the shell side, the gas-liquid phase mixes only in the heat exchange tube in the shell side. The liquid phase in one section of the heat exchange tube exchanges heat with the shell side medium through the tube wall without mixing with the gas phase. The gas distribution tube in this section is blocked by the liquid phase in the annular gap and fails to exchange heat with the shell side, affecting the heat exchange with the shell side medium. Summary of the Invention

[0007] In view of the above technical problems existing in the prior art, the present utility model provides a tube side structure for two-component mixed feeding.

[0008] To achieve the above object, the present utility model provides the following technical solutions:

[0009] Provide a tube side structure for two-component mixed feeding, including a main cylinder, a liquid phase tube box, and a gas phase tube box arranged in sequence. A main tube sheet is provided between the main cylinder and the liquid phase tube box, and a secondary tube sheet is provided between the liquid phase tube box and the gas phase tube box, so that the main cylinder and the main tube sheet jointly enclose a shell side, the liquid phase tube box, the main tube sheet, and the secondary tube sheet jointly enclose a liquid phase chamber, and the gas phase tube box and the secondary tube sheet enclose a gas phase chamber;

[0010] A plurality of heat exchange tubes arranged in parallel are provided in the shell side. The ends of the plurality of heat exchange tubes are fixed to the main tube sheet and communicate with the liquid phase chamber. A tube side liquid phase inlet is provided on the side wall of the liquid phase tube box, and a tube side gas phase inlet is provided on the gas phase tube box; A plurality of gas distribution tubes corresponding to the heat exchange tubes one by one are provided in the liquid phase chamber. One end of the gas distribution tube is fixed to the secondary tube sheet and communicates with the gas phase chamber; The feature is:

[0011] The other end of the gas distribution tube is close to the port of the corresponding heat exchange tube and has a preset distance, and a positioning member is connected to this end. The port of the heat exchange tube and / or the main tube sheet limit the positioning member radially. The positioning member has a notch, so that the heat exchange tube, the liquid phase chamber, and the gas distribution tube are connected and communicated.

[0012] As a further optional technical solution, the port of the heat exchange tube penetrates out of the side surface of the main tube sheet, and the positioning member is embedded in the heat exchange tube and abuts against its inner wall.

[0013] As a further optional technical solution, the port of the heat exchange tube retracts into the tube hole of the main tube sheet, the positioning member is embedded in the tube hole of the main tube sheet and abuts against its inner wall, or the positioning member abuts against the tube hole of the main tube sheet and the inner wall of the heat exchange tube at the same time.

[0014] As a further optional technical solution, the distance between the port of the gas distribution pipe and the heat exchange pipe is 10 mm to 50 mm.

[0015] As a further optional technical solution, the positioning member includes a plurality of supporting pieces made of metal. The plurality of supporting pieces are arranged circumferentially around the gas distribution pipe with gaps left between adjacent supporting pieces, and the plurality of supporting pieces abut against the inner wall of the port of the heat exchange pipe / the inner wall of the pipe hole of the main tube sheet.

[0016] As a further optional technical solution, the positioning member includes a first snap ring, a second snap ring and a plurality of connecting bars. The plurality of connecting bars are arranged with gaps left to form the gap, and their two ends are respectively fixed to the first snap ring and the second snap ring. The first snap ring is frictionally fitted into the pipe hole of the heat exchange pipe or the main tube sheet, and the second snap ring is connected to the gas distribution pipe.

[0017] As a further optional technical solution, a baffle plate and a support plate are arranged in the liquid-phase header box, and a plurality of gas distribution pipes are arranged through the baffle plate and the support plate.

[0018] As a further optional technical solution, the number of the tube-side liquid inlets is more than two, and the more than two tube-side liquid inlets are circumferentially distributed around the liquid-phase header box.

[0019] As a further optional technical solution, a buffer baffle is arranged at the position corresponding to the tube-side liquid inlet of the liquid-phase header box.

[0020] As a further optional technical solution, the main cylinder body, the main tube sheet, the liquid-phase header box, the auxiliary tube sheet, the gas-phase header box and the tube-side gas inlet are coaxially arranged.

[0021] Advantages of the present utility model:

[0022] For the tube-side structure of the two-component mixed feed of the present utility model, during use, the liquid-phase material enters the liquid-phase chamber from the tube-side liquid inlet, and the gas-phase material enters the gas-phase chamber from the tube-side gas inlet and then flows to each gas distribution pipe, and then enters the liquid-phase chamber. The gas-liquid phase materials are mixed at a position close to the heat exchange pipe in the liquid-phase chamber and jointly enter the heat exchange pipe. The gas-liquid mixed material exchanges heat with the shell-side medium through the pipe wall during its travel in the heat exchange pipe. Among them, a small part of the gas-phase material enters the liquid-phase chamber through the gap of the positioning member to preheat the liquid-phase material. Compared with the prior art:

[0023] ① A distance is reserved between the gas distribution pipe and the heat exchange pipe. Therefore, the blockage of the gas distribution pipe to the inlet of the heat exchange pipe is small. Under the pressure in the liquid-phase chamber and the suction drive of the gas-phase material, the gas-liquid phase can enter the heat exchange pipe more smoothly and uniformly;

[0024] ② The gas distribution pipe is radially limited by the positioning member. The positioning member has a gap for the liquid-phase material to pass through. Compared with the annular gap channel in the prior art, the liquid-phase material is easier to pass through;

[0025] ③ The ports of the heat exchange tubes and / or the main tube sheet are limited by the positioning members in the radial direction, and the positioning members are connected to the gas distribution pipe. Therefore, the end of the gas distribution pipe is stable and not easily impacted and vibrated by the materials, extending the service life of the equipment.

[0026] ④ The liquid-phase material is mixed with the gas-phase material instantly when entering the heat exchange tube. Thus, the flowing material in the whole heat exchange tube is the mixed material, ensuring the heat exchange efficiency of the shell side.

[0027] It should be noted that regarding the inventiveness of this case, the closest prior art has clearly informed that the gas distribution pipe is the lower end of the inner-extended heat exchange tube and given a clear inner-extension range. Those skilled in the art without creativity have no motivation to do the opposite and change it to make the gas distribution pipe not extend into the heat exchange tube. And as long as the gas distribution pipe extends into the heat exchange tube, regardless of the extension degree, the gas-liquid phases will surely mix only after entering the heat exchange tube and during the high-speed travel in the tube, and the effect that the gas-liquid two phases mix when / before entering the heat exchange tube as in this application cannot be achieved. Therefore, this application has outstanding substantive features and significant progress compared with the above prior art. Description of the Drawings

[0028] Figure 1 It is a schematic structural view of the tube-side structure of a two-component mixed feed in the embodiment.

[0029] Figure 2 It is Figure 1 an enlarged view of part A in

[0030] Figure 3 It is Figure 2 a cross-sectional view taken along the section B-B in

[0031] Figure 4 It is Figure 2 a schematic view of another embodiment of

[0032] Figure 5 a schematic view of the positioning member in another form in the embodiment.

[0033] Reference Signs:

[0034] Main cylinder 1, liquid-phase tube box 2, gas-phase tube box 3, main tube sheet 4, auxiliary tube sheet 5, liquid-phase chamber 6, gas-phase chamber 7, heat exchange tube 8, tube-side liquid-phase inlet 9, tube-side gas-phase inlet 10, gas distribution pipe 11, flange plate 12, bolt and nut assembly 13, baffle plate 14, support plate 15, buffer baffle 16.

[0035] Positioning member 17, notch 171, supporting piece 172; first snap ring 173, second snap ring 174, connecting strip 175. Detailed Embodiment

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0037] A tube-side structure for two-component mixed feeding in this embodiment is as Figures 1 to 3 shown, including a main cylinder body 1, a liquid-phase header tank 2, and a gas-phase header tank 3 arranged in sequence. A flange plate 12 is welded and fixed at the end of the liquid-phase header tank 2, and the gas-phase header tank 3 and the liquid-phase header tank 2 are fixedly sealed at the flange plate 12 by a bolt-nut assembly 13. A main tube sheet 4 is arranged between the main cylinder body 1 and the liquid-phase header tank 2, and a secondary tube sheet 5 is arranged between the liquid-phase header tank 2 and the gas-phase header tank 3, so that the main cylinder body 1 and the main tube sheet 4 jointly enclose a shell side, and the liquid-phase header tank 2, the main tube sheet 4, and the secondary tube sheet 5 jointly enclose a liquid-phase chamber 6, and the gas-phase header tank 3 and the secondary tube sheet 5 enclose a gas-phase chamber 7.

[0038] A plurality of heat exchange tubes 8 arranged in parallel are provided in the shell side. One end of the plurality of heat exchange tubes 8 is welded and fixed to the main tube sheet 4 and communicates with the liquid-phase chamber 6. A tube-side liquid inlet 9 is provided on the side wall of the liquid-phase header tank 2, and a tube-side gas inlet 10 is provided on the gas-phase header tank 3.

[0039] A plurality of gas distribution tubes 11 arranged in parallel corresponding to the heat exchange tubes 8 are provided in the liquid-phase chamber 6. One end of the gas distribution tubes 11 is welded and fixed to the secondary tube sheet 5 and communicates with the gas-phase chamber 7. The other end of the gas distribution tubes 11 is close to the port of the corresponding heat exchange tube 8 and a preset distance is left. The distance between the port of the gas distribution tube 11 and the port of the heat exchange tube 8 is 10 mm to 50 mm, preferably 15 mm to 20 mm. A positioning member 17 is connected to the end of the gas distribution tube 11 close to the main tube sheet 4. The port of the heat exchange tube 8 limits the positioning member 17 in the radial direction. The positioning member 17 has a notch 171, so that the heat exchange tube 8, the liquid-phase chamber 6, and the gas distribution tubes 11 are connected and communicated.

[0040] Specifically, the positioning member 17 includes three supporting pieces 172 made of a metal material. The three supporting pieces 172 are evenly spaced around the circumference of the gas distribution tube 11, so as to leave the notch 171 between two adjacent supporting pieces 172 for the liquid-phase material in the liquid-phase chamber 6 to flow through and enter the heat exchange tube 8. One end of the three supporting pieces 172 is welded and stands on the outer wall of the gas distribution tube 11, and the other end of the three supporting pieces 172 abuts against the inner wall of the port of the heat exchange tube 8 to prevent the positioning member 17 from shaking in the radial direction. Of course, the number of the supporting pieces 172 can be changed to other values in practice.

[0041] Specifically, the positioning member 17 can axially move along the inner wall of the heat exchange tube to provide a deformation space for the thermal elongation deformation of the gas distribution tube 11.

[0042] Specifically, a baffle plate 14 and a support plate 15 are arranged in the liquid-phase tube box 2, and multiple gas-phase distribution pipes 11 are arranged through the baffle plate 14 and the support plate 15, making the gas-phase distribution pipes 11 more stable.

[0043] Specifically, the number of the tube-side liquid inlets 9 is more than two, and the two or more tube-side liquid inlets 9 are circumferentially distributed around the liquid-phase tube box 2. A buffer baffle 16 is arranged at the corresponding position of the tube-side liquid inlet 9 of the liquid-phase tube box 2 to prevent the liquid from directly impacting the gas-phase distribution pipes 11.

[0044] Specifically, the main cylinder body 1, the main tube sheet 4, the liquid-phase tube box 2, the auxiliary tube sheet 5, the gas-phase tube box 3 and the tube-side gas inlet 10 are coaxially arranged. The gas-phase material can enter the gas-phase distribution pipes 11 at a relatively fast speed, and after coming out of the gas-phase distribution pipes 11, it inhales the liquid-phase material and continues to rush into the heat exchange tubes 8 while maintaining potential energy.

[0045] In this embodiment, as Figure 2 shown, the ports of the heat exchange tubes 8 penetrate through the side surface of the main tube sheet 4, and the positioning member 17 is embedded in the heat exchange tubes 8 and abuts against their inner walls. As an alternative solution, as Figure 4 shown, the ports of the heat exchange tubes 8 retract into the tube holes of the main tube sheet 4, the positioning member 17 is embedded in the tube holes of the main tube sheet 4 and abuts against their inner walls, or the positioning member 17 abuts against the tube holes of the main tube sheet 4 and the inner walls of the heat exchange tubes 8 at the same time.

[0046] Another form of the positioning member 17 is as Figure 5 shown. The positioning member 17 includes a first snap ring 173, a second snap ring 174 and multiple connecting bars 175. The first snap ring 173 and the second snap ring 174 are coaxially and separately arranged. The multiple connecting bars 175 are separately arranged to leave the notch 171, and both ends of the multiple connecting bars 175 are respectively fixed to the first snap ring 173 and the second snap ring 174. The first snap ring 173 is press-fitted into the inner wall of the heat exchange tube 8 or the tube hole of the main tube sheet 4, and the second snap ring 174 is connected to the gas-phase distribution pipes 11. The liquid-phase material in the liquid-phase chamber 6 enters the heat exchange tubes 8 between the two connecting bars 175.

[0047] In the description of the present invention, obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the above detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0049] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0050] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A tube-side structure for two-component mixed feed, comprising a main cylinder (1), a liquid phase tube box (2) and a gas phase tube box (3) arranged in sequence, a main tube plate (4) being arranged between the main cylinder (1) and the liquid phase tube box (2), and a secondary tube plate (5) being arranged between the liquid phase tube box (2) and the gas phase tube box (3), so that the main cylinder (1) and the main tube plate (4) together form a shell side, the liquid phase tube box (2), the main tube plate (4) and the secondary tube plate (5) together form a liquid phase chamber (6), and the gas phase tube box (3) and the secondary tube plate (5) form a gas phase chamber (7); A plurality of heat exchange tubes (8) arranged in parallel are arranged in the shell side, the ends of the plurality of heat exchange tubes (8) are fixed to the main tube plate (4) and are connected to the liquid phase chamber (6), the side wall of the liquid phase tube box (2) is provided with a tube side liquid phase inlet (9), and the gas phase tube box (3) is provided with a tube side gas phase inlet (10); the liquid phase chamber (6) is provided with a plurality of gas phase distribution tubes (11) corresponding one to one to the heat exchange tubes (8), one end of the gas phase distribution tube (11) is fixed to the auxiliary tube plate (5) and is connected to the gas phase chamber (7); the characteristics are: The other end of the gas phase distribution pipe (11) is close to the port of the corresponding heat exchange pipe (8) and a preset distance is left, and the end is connected to a positioning piece (17). The port of the heat exchange pipe (8) and / or the main pipe plate (4) limit the positioning piece (17) in the radial direction, and the positioning piece (17) has a notch (171), so that the heat exchange pipe (8), the liquid phase chamber (6) and the gas phase distribution pipe (11) are connected.

2. The tube-side structure of a two-component mixed feed according to claim 1 is characterized in that: The end of the heat exchange tube (8) passes through the side of the main pipe plate (4), and the positioning piece (17) is embedded in the heat exchange tube (8) and pressed against the inner wall thereof.

3. The tube-side structure of a two-component mixed feed according to claim 1 is characterized in that: The port of the heat exchange tube (8) is retracted into the tube hole of the main plate (4), and the positioning member (17) is embedded in the tube hole of the main plate (4) and pressed against the inner wall thereof, or the positioning member (17) simultaneously presses against the tube hole of the main plate (4) and the inner wall of the heat exchange tube (8).

4. The tube-side structure of a two-component mixed feed according to claim 1 is characterized in that: The distance between the port of the gas phase distribution pipe (11) and the heat exchange pipe (8) is 10 mm to 50 mm.

5. The tube-side structure of a two-component mixed feed according to claim 1, characterized in that: The positioning member (17) comprises a plurality of supporting plates (172) made of metal material, wherein the plurality of supporting plates (172) are arranged in a circumferentially spaced manner around the gas phase distribution tube (11), thereby leaving the gap (171) between two adjacent supporting plates (172), and the plurality of supporting plates (172) are against the inner wall of the port of the heat exchange tube (8) / the inner wall of the tube hole of the main pipe plate (4).

6. The tube-side structure of a two-component mixed feed according to claim 1, characterized in that: The positioning member (17) comprises a first clamping ring (173), a second clamping ring (174) and a plurality of connecting strips (175); the plurality of connecting strips (175) are arranged in a spaced manner to leave the notch (171) and the first clamping ring (173) and the second clamping ring (174) are fixed at both ends thereof respectively; the first clamping ring (173) is frictionally fitted into a tube hole of a heat exchange tube (8) or a main tube plate (4), and the second clamping ring (174) is connected to a gas phase distribution tube (11).

7. The tube-side structure of a two-component mixed feed according to claim 1 is characterized in that: A baffle plate (14) and a support plate (15) are arranged in the liquid phase pipe box (2), and a plurality of gas phase distribution pipes (11) are passed through the baffle plate (14) and the support plate (15).

8. The tube-side structure of a two-component mixed feed according to claim 1, characterized in that: The number of the tube-side liquid phase inlets (9) is more than two, and the more than two tube-side liquid phase inlets (9) are distributed around the circumference of the liquid phase tube box (2).

9. The tube-side structure of a two-component mixed feed according to claim 8, characterized in that: A buffer baffle (16) is provided at a position of the liquid phase pipe box (2) corresponding to the pipe-side liquid phase inlet (9).

10. A tube-side structure for a two-component mixed feed according to claim 1, characterized in that: The cylinder (1), the main tube plate (4), the liquid phase tube box (2), the auxiliary tube plate (5), the gas phase tube box (3) and the tube-side gas phase inlet (10) are coaxially arranged.

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