Reboiler

Abstract

The present application provides a kind of reboiler, it is related to distillation column external device technical field, solve the technical problems that the existing kettle type reboiler in prior art uses high temperature steam as tube side medium, shell side kettle liquid inlet section is prone to subcooling boiling phenomenon, will produce larger noise simultaneously easy to cause tube bundle vibration, make equipment operation process exist security risk.The reboiler includes medium tube bundle, gas-liquid separation structure, evaporation space and preheating space, wherein each medium tube of medium tube bundle is distributed in evaporation space and preheating space, medium tube bundle and gas-liquid separation structure are connected and the liquid phase medium formed after gas-liquid separation structure can flow into the medium tube in preheating space, preheating space is communicated with the kettle liquid inlet of reboiler and the kettle liquid entering through kettle liquid inlet can flow to evaporation space through preheating space.Heat is transferred to the kettle liquid of preheating space by non phase change convection, reduce the kettle liquid temperature difference outside tube and tube outer wall surface, avoid kettle liquid subcooling boiling.

Description

TECHNICAL FIELD

[0001] The present application relates to distillation column external equipment technical field, especially to a reboiler used with distillation column. BACKGROUND

[0002] Reboiler is a kind of equipment commonly used in chemical production, usually used with distillation column, for vaporizing tower bottom product. Among them, kettle type reboiler has been widely used due to large heat transfer area, high vaporization rate, easy maintenance and cleaning. During the working process of kettle type reboiler, liquid working medium enters the shell side of reboiler from the bottom for evaporation, and after the overflow weir, it is recovered into the liquid storage tank in an overflow manner, and the rising steam leaves the vaporization space and returns to the distillation column to be concentrated from the top of the column. High-temperature medium flows through the inner side of the heat exchange tube to transfer heat to the kettle liquid in the shell side. The heat exchange tube bundle needs to be completely immersed in the kettle liquid.

[0003] Reference Figure 1 The tube bundle of kettle type reboiler is mostly double-tube U-shaped tube structure. If high-temperature steam is used as the tube side medium, during the heat exchange process between the high-temperature steam in the tube side and the kettle liquid in the shell side, the high-temperature steam gradually condenses along the flow direction. When the kettle liquid enters the shell side from the bottom of the reboiler, it is generally in a subcooled liquid state. If the temperature of the outer wall of the tube is too high, the kettle liquid will undergo subcooled boiling, which will produce a lot of noise and easily cause tube bundle vibration, resulting in safety hazards in the operation process of the equipment. SUMMARY

[0004] The present application provides a reboiler, which solves the technical problem that the existing kettle type reboiler uses high-temperature steam as the tube side medium, the inlet section of the kettle liquid in the shell side is prone to subcooled boiling, which will produce a lot of noise and easily cause tube bundle vibration, resulting in safety hazards in the operation process of the equipment. The preferred technical solutions in the many technical solutions provided by the present application can produce many technical effects, which are described in detail below.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The present application provides a reboiler, which includes a medium tube bundle, a gas-liquid separation structure, an evaporation space and a preheating space. Each medium tube of the medium tube bundle is distributed in the evaporation space and the preheating space. The medium tube bundle and the gas-liquid separation structure are connected, and the liquid phase medium formed after passing through the gas-liquid separation structure can flow into the medium tube in the preheating space. The preheating space is connected with the kettle liquid inlet of the reboiler, and the kettle liquid entering through the kettle liquid inlet can flow to the evaporation space through the preheating space.

[0007] Further, the medium tube bundle includes an inlet medium tube bundle and an outlet medium tube bundle, one end of the inlet medium tube bundle and the outlet medium tube bundle is communicated with the tube inlet and the tube outlet of the reboiler respectively, the other end of the inlet medium tube bundle and the outlet medium tube bundle is connected with the gas-liquid separation structure; the outlet medium tube bundle is divided into an outlet medium liquid phase tube bundle and an outlet medium gas phase tube bundle, the outlet medium liquid phase tube bundle is located in the preheating space, the outlet medium gas phase tube bundle and the inlet medium tube bundle are located in the evaporation space, the gas phase medium formed after the gas-liquid separation structure can flow into the outlet medium gas phase tube bundle.

[0008] Further, the gas-liquid separation structure includes a gas-liquid separation component, the gas-liquid separation structure and the shell of the reboiler form a gas-liquid separation cavity, the gas-liquid separation component is located in the gas-liquid separation cavity, the medium entering the gas-liquid separation cavity can realize gas-liquid gravity sedimentation separation through the gas-liquid separation component.

[0009] Further, the inlet medium tube bundle is communicated with the space above the gas-liquid separation component, the top of the gas-liquid separation component forms an inlet into the gas-liquid separation component, the outlet medium liquid phase tube bundle is communicated with the space below the gas-liquid separation component, the bottom of the gas-liquid separation component is provided with a filtrate hole, and the outlet medium gas phase tube bundle is communicated with the space in the gas-liquid separation component.

[0010] Further, the gas-liquid separation component includes an upper baffle, a tube filter plate and a tube baffle, the upper baffle is arranged above the tube filter plate and is spaced apart, the side of the upper baffle away from the medium tube bundle has a spacing with the gas-liquid separation cavity to form the inlet, the tube filter plate is distributed with a filtrate hole, and a plurality of tube baffles are alternately distributed on the upper baffle and the tube filter plate to form a tortuous flow channel between the upper baffle and the tube filter plate.

[0011] Further, the gas-liquid separation structure further includes a right tube plate, an upper sealing plate and an overflow weir, the overflow weir is arranged on the side of the right tube plate away from the medium tube bundle, one end of the medium tube bundle is inserted into the right tube plate, the upper sealing plate connects the right tube plate and the upper sealing plate, and the right tube plate, the upper sealing plate, the overflow weir and the shell of the reboiler form the gas-liquid separation cavity.

[0012] Further, the reboiler includes a left tube plate and a tube separation plate, one end of the medium tube bundle is connected with the left tube plate, and the tube separation plate divides the space on the left side of the left tube plate into an upper space communicated with the tube inlet and a lower space communicated with the tube outlet, the inlet medium tube bundle is communicated with the upper space, and the outlet medium tube bundle is communicated with the lower space.

[0013] Further, the reboiler further comprises a shell side baffle, which is arranged in the shell of the reboiler and one end of the shell side baffle is connected with the left tube plate in the shell, and there is a space between the end of the shell side baffle close to the gas-liquid separation structure and the gas-liquid separation structure, the space above the shell side baffle is the evaporation space, and the space below the shell side baffle is the preheating space.

[0014] Further, the reboiler further comprises a turbulence structure, which is arranged below the shell side baffle, and the turbulence structure is arranged to increase the time of the kettle liquid flowing through the preheating space.

[0015] Further, the turbulence structure comprises upper shell side baffles and lower shell side baffles, the upper shell side baffles are connected with the lower plate surface of the shell side baffle and there is a space between the upper shell side baffles and the inner side surface of the bottom of the shell, the lower shell side baffles are connected with the inner side surface of the bottom of the shell and there is a space between the lower shell side baffles and the lower plate surface of the shell side baffle, and a plurality of the upper shell side baffles and the lower shell side baffles are alternately distributed along the direction parallel to the axis of the reboiler.

[0016] Further, the bottom of the lower shell side baffle is provided with a liquid passing gap.

[0017] The reboiler provided by the application comprises a medium tube bundle, a gas-liquid separation structure, an evaporation space and a preheating space, wherein each medium tube of the medium tube bundle is arranged in the evaporation space and the preheating space respectively, the medium tube bundle is connected with the gas-liquid separation structure, and the liquid-phase medium formed after passing through the gas-liquid separation structure can flow into the medium tube in the preheating space, the preheating space is connected with the kettle liquid inlet of the reboiler, and the kettle liquid entering through the kettle liquid inlet can flow to the evaporation space through the preheating space.

[0018] The preferred technical scheme of the application can at least produce the following technical effects:

[0019] The reboiler further comprises a turbulence structure, which is arranged below the shell side baffle, and the turbulence structure is arranged to increase the time of the kettle liquid flowing through the preheating space, so that the kettle liquid can be fully heat-exchanged with the medium in the liquid-phase medium tube bundle. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings described below only illustrate some of the embodiments of the present application, and do not represent all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0021] Figure 1 is a sectional view of a reboiler in the prior art;

[0022] Figure 2 is a sectional view of a reboiler provided by the embodiments of the present application;

[0023] Figure 3 is a sectional view of a reboiler provided by the embodiments of the present application (without showing the medium tube bundle);

[0024] Figure 4 is a schematic view of the internal structure of a reboiler provided by the embodiments of the present application (without showing the medium tube bundle);

[0025] Figure 5 is a schematic view of a gas-liquid separation structure provided by the embodiments of the present application;

[0026] Figure 6 is a schematic view of the structure of a lower shell pass baffle provided by the embodiments of the present application.

[0027] In the figure, 1 is a medium tube bundle; 2 is an evaporation space; 3 is a preheating space; 4 is a kettle liquid inlet; 5 is a tube pass gas inlet; 6 is a tube pass liquid outlet; 7 is a shell; 8 is a gas-liquid separation cavity; 9 is an upper baffle; 10 is a tube pass filtrate plate; 11 is a tube pass baffle; 12 is a filtrate hole; 13 is a right tube plate; 14 is an upper sealing plate; 15 is an overflow weir; 16 is a left tube plate; 17 is a tube pass partition plate; 18 is a shell pass baffle; 19 is an upper shell pass baffle; 20 is a lower shell pass baffle; 21 is a liquid passing gap; 22 is a steam outlet; and 23 is a kettle liquid outlet. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments only represent some of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] Reference is made to Figure 1The present application discloses a reboiler, which is used for solving the problem of the existing reboiler that the tube bundle is a double-tube U-shaped tube structure, and the high-temperature steam is used as the tube-side medium, and the high-temperature steam is gradually condensed along the flow direction in the process of heat exchange between the high-temperature steam and the shell-side liquid, and the liquid is in a supercooled state when entering the shell side from the bottom of the reboiler, and the high temperature of the outer wall of the tube can cause the supercooled boiling of the liquid, and the large noise and the vibration of the tube bundle can be caused, and the safety of the equipment is hidden. Figures 3-4 The structure is as follows: the reboiler comprises a medium tube bundle 1, a gas-liquid separation structure, an evaporation space 2 and a preheating space 3, wherein each medium tube of the medium tube bundle 1 is distributed in the evaporation space 2 and the preheating space 3, the medium tube bundle 1 is connected with the gas-liquid separation structure, and the liquid-phase medium formed after the gas-liquid separation structure can flow into the medium tube in the preheating space 3, the preheating space 3 is connected with a liquid inlet 4 of the reboiler, and the liquid entering through the liquid inlet 4 can flow to the evaporation space 2 through the preheating space 3. When the liquid enters the preheating space 3 through the liquid inlet 4, the liquid exchanges heat with the medium in each medium tube in the preheating space 3. Since the liquid-phase medium formed after the gas-liquid separation structure flows into the medium tube in the preheating space 3, the liquid exchanges heat with the medium in a liquid-liquid non-phase-change manner, that is, the heat is transferred to the liquid through non-phase-change convection, the temperature of the liquid in the medium tube is reduced to a supercooled state, and the temperature of the shell-side liquid is increased to a saturated liquid state. The heat is transferred to the liquid through non-phase-change convection, the temperature difference between the fluid outside the tube and the outer wall of the tube is reduced, and the supercooled boiling of the liquid is avoided.

[0030] Specifically, the medium tube bundle 1 comprises an inlet medium tube bundle and an outlet medium tube bundle, one end of the inlet medium tube bundle and the outlet medium tube bundle is connected with a tube-side gas inlet 5 and a tube-side liquid outlet 6 of the reboiler respectively, and the other end of the inlet medium tube bundle and the outlet medium tube bundle is connected with the gas-liquid separation structure; the outlet medium tube bundle is divided into an outlet medium liquid-phase tube bundle and an outlet medium gas-phase tube bundle, the outlet medium liquid-phase tube bundle is located in the preheating space 3, the outlet medium gas-phase tube bundle and the inlet medium tube bundle are located in the evaporation space 2, and the gas-phase medium formed after the gas-liquid separation structure can flow into the outlet medium gas-phase tube bundle. The tube-side medium enters the inlet medium tube bundle through the tube-side gas inlet 5, and then flows to the gas-liquid separation structure through the inlet medium tube bundle. The tube-side medium is separated into gas and liquid in the tube-side medium, the separated gas-phase flows to the tube-side liquid outlet 6 through the outlet medium gas-phase tube bundle, and the separated liquid-phase flows to the tube-side liquid outlet 6 through the outlet medium liquid-phase tube bundle. The outlet medium liquid-phase tube bundle is located in the preheating space 3, the outlet medium gas-phase tube bundle and the inlet medium tube bundle are located in the evaporation space 2, and the liquid entering through the liquid inlet 4 flows to the evaporation space 2 through the preheating space 3, that is, the liquid entering through the liquid inlet 4 exchanges heat with the outlet medium liquid-phase tube bundle first, and then exchanges heat with the outlet medium gas-phase tube bundle and the inlet medium tube bundle after preheating.

[0031] The specific heat exchange between the tube-side medium and the liquid is as follows:

[0032] In the medium-incoming tube bundle, the medium-incoming tube is saturated gas-liquid two-phase, and the saturated gas transfers heat to the shell-side kettle liquid through phase-change convection heat transfer. The tube-side gas-phase fluid gradually condenses into liquid phase, and the shell-side saturated kettle liquid absorbs heat to evaporate into gas phase. At this time, the kettle liquid and the fluid in the medium-incoming tube exchange heat mainly in the form of latent heat of phase change.

[0033] In the medium-outgoing liquid-phase tube bundle, the medium-incoming tube is saturated liquid phase after gas-liquid separation, and the shell-side is subcooled kettle liquid. At this time, it is liquid-liquid non-phase-change heat transfer, that is, heat is transferred to the kettle liquid through non-phase-change convection. The temperature of the liquid in the medium-incoming tube decreases to become subcooled, and the temperature of the shell-side kettle liquid increases to gradually become saturated liquid. Heat is transferred to the kettle liquid through non-phase-change convection, and the temperature difference between the fluid outside the tube and the tube outer wall is reduced to avoid subcooled boiling of the kettle liquid.

[0034] In the medium-outgoing gas-phase tube bundle, the medium-incoming tube is saturated gas phase after gas-liquid separation. Compared with the gas-liquid mixed state, the single-phase gas condensation heat transfer efficiency is higher.

[0035] Regarding the gas-liquid separation structure, the gas-liquid separation structure includes a gas-liquid separation component. The gas-liquid separation structure and the shell 7 of the reboiler form a gas-liquid separation cavity 8. The gas-liquid separation component is located in the gas-liquid separation cavity 8. The medium entering the gas-liquid separation cavity 8 can realize gas-liquid gravity sedimentation separation through the gas-liquid separation component. The tube-side medium enters the medium-incoming tube bundle through the tube-side inlet 5, and then flows to the gas-liquid separation cavity 8 through the medium-incoming tube bundle. The medium entering the gas-liquid separation cavity 8 realizes gas-liquid gravity sedimentation separation through the gas-liquid separation component. The separated liquid phase flows to the medium-outgoing liquid-phase tube bundle, and the separated gas phase flows to the medium-outgoing gas-phase tube bundle.

[0036] Specifically, the medium-incoming tube bundle is connected with the space above the gas-liquid separation component. The gas-liquid separation component forms an inlet into the gas-liquid separation component at the top. The medium-outgoing liquid-phase tube bundle is connected with the space below the gas-liquid separation component. The gas-liquid separation component is provided with a liquid filter hole 12 at the bottom. The medium-outgoing gas-phase tube bundle is connected with the space in the gas-liquid separation component. The medium in the medium-incoming tube bundle flows to the gas-liquid separation cavity 8 and flows to the space above the gas-liquid separation component. Then the medium flows to the gas-liquid separation component through the inlet, realizes gas-liquid gravity sedimentation separation through the gas-liquid separation component, and the separated liquid phase flows to the space below the gas-liquid separation component through the liquid filter hole 12 and can flow into the medium-outgoing liquid-phase tube bundle. The separated gas phase flows to the medium-outgoing gas-phase tube bundle.

[0037] Regarding the structure of the gas-liquid separation component, the following can be provided: referring to Figure 4 and Figure 5The gas-liquid separation component includes an upper baffle 9, a tube-passing filtrate plate 10, and tube-passing baffles 11. The upper baffle 9 is arranged above the tube-passing filtrate plate 10 and spaced apart therefrom. A space is formed between the side of the upper baffle 9 away from the medium tube bundle 1 and the gas-liquid separation cavity 8 to form an inlet. The tube-passing filtrate plate 10 is provided with filtrate holes 12 distributed thereon. The tube-passing baffles 11 are alternately arranged on the upper baffle 9 and the tube-passing filtrate plate 10 to form a tortuous flow channel in the middle of the upper baffle 9 and the tube-passing filtrate plate 10.

[0038] Referring to Figure 5 , the upper baffle 9, the tube-passing filtrate plate 10, and the tube-passing baffles 11 are schematically shown. The upper baffle 9 can be arranged as a folded plate, referring to Figure 5 , the side of the upper baffle 9 away from the right tube plate 13 has a downwardly bent region. The tube-passing baffles 11 include upper tube-passing baffles and lower tube-passing baffles. The upper tube-passing baffles are connected to the upper baffle 9 and spaced apart from the tube-passing filtrate plate 10. The lower tube-passing baffles are connected to the tube-passing filtrate plate 10 and spaced apart from the upper baffle 9. The upper tube-passing baffles and the lower tube-passing baffles are alternately arranged to form a tortuous flow channel. In addition, referring to Figure 5 , the upper tube-passing baffles and the lower tube-passing baffles are arranged in parallel and inclined. The downwardly bent region of the upper baffle 9 is also arranged in parallel with the tube-passing baffles 11. The tube-passing filtrate plate 10 is provided with filtrate holes 12 distributed thereon. The distribution of the filtrate holes 12 on the tube-passing filtrate plate 10 can be arranged as follows: a row of filtrate holes 12 is arranged on the side of the tube-passing filtrate plate 10 connected to the overflow weir 15, and a row of filtrate holes 12 is arranged on the side of the tube-passing filtrate plate 10 connected to the right tube plate 13. Each lower tube-passing baffle corresponds to a row of filtrate holes 12.

[0039] The tube-passing medium enters the medium tube bundle through the tube-passing inlet 5, then flows to the gas-liquid separation cavity 8, and realizes gravity settling separation in the space above the upper baffle 9 by utilizing the density difference between gas and liquid. Subsequently, the gas-liquid two-phase flows downward through the inlet, collides with the overflow weir 15 and the tube-passing filtrate plate 10 to realize gas-liquid separation. The gas-liquid two-phase collides with the upper baffle 9, the tube-passing filtrate plate 10, and the tube-passing baffles 11 when flowing through the upper tube-passing baffles and the lower tube-passing baffles to further realize gas-liquid separation. The condensed liquid enters the liquid accumulation space (the space below the tube-passing filtrate plate 10) through the filtrate holes 12 and then enters the medium liquid-phase tube bundle, and the separated high-temperature steam enters the medium gas-phase tube bundle.

[0040] Regarding the gas-liquid separation cavity 8, referring to Figure 4 , the gas-liquid separation structure further includes a right tube plate 13, an upper sealing plate 14, and an overflow weir 15. The overflow weir 15 is arranged on the side of the right tube plate 13 away from the medium tube bundle 1. One end of the medium tube bundle 1 is inserted into the right tube plate 13. The right tube plate 13 and the upper sealing plate 14 are connected. The right tube plate 13, the upper sealing plate 14, the overflow weir 15, and the shell 7 of the reboiler form the gas-liquid separation cavity 8.

[0041] Referring to Figure 4 The reboiler comprises a left tube plate 16 and a tube pass partition plate 17, one end of the medium tube bundle 1 is connected with the left tube plate 16, the tube pass partition plate 17 divides the space on the left side of the left tube plate 16 into an upper space connected with the tube pass gas inlet 5 and a lower space connected with the tube pass liquid outlet 6, the medium inlet tube bundle is connected with the upper space, and the medium outlet tube bundle is connected with the lower space. The medium enters the upper space through the tube pass gas inlet 5, then flows to the medium inlet tube bundle, and the medium in the medium outlet tube bundle flows to the lower space, and then flows to the tube pass liquid outlet 6.

[0042] Referring to Figure 4 The left tube plate 16 and the right tube plate 13 are provided with tube assembly holes, and each medium tube of the medium tube bundle 1 is a straight tube, and the two ends of the straight tube are respectively inserted into and supported on the left tube plate 16 and the right tube plate 13.

[0043] Regarding the formation of the evaporation space 2 and the preheating space 3, referring to Figure 2 and Figure 3 The reboiler further comprises a shell pass baffle 18, the shell pass baffle 18 is arranged in the shell 7 of the reboiler, one end of the shell pass baffle 18 is connected with the left tube plate 16 in the shell 7, there is a space between the end of the shell pass baffle 18 close to the gas-liquid separation structure and the gas-liquid separation structure, the space above the shell pass baffle 18 is the evaporation space 2, and the space below the shell pass baffle 18 is the preheating space 3. The kettle liquid enters the preheating space 3 through the kettle liquid inlet 4, and the kettle liquid flows to the evaporation space 2 through the space between the shell pass baffle 18 and the right tube plate 13. In addition, it is preferred that the thickness of the shell pass baffle 18 is equal to that of the tube pass liquid filter plate 10, and the heights of the shell pass baffle 18 and the tube pass liquid filter plate 10 are the same.

[0044] Preferably, the reboiler further comprises a turbulence structure, the turbulence structure is arranged below the shell pass baffle 18, and the turbulence structure is arranged to increase the time of the kettle liquid flowing through the preheating space 3, so that the kettle liquid and the medium in the medium outlet liquid phase tube bundle can be fully heat-exchanged.

[0045] Regarding the turbulence structure, the specific structure is as follows, referring to Figure 4 The turbulence structure comprises an upper shell pass baffle 19 and a lower shell pass baffle 20, the upper shell pass baffle 19 is connected with the lower plate surface of the shell pass baffle 18 and is spaced apart from the inner side surface of the bottom of the shell 7, the lower shell pass baffle 20 is connected with the inner side surface of the bottom of the shell 7 and is spaced apart from the lower plate surface of the shell pass baffle 18, and a plurality of upper shell pass baffles 19 and lower shell pass baffles 20 are alternately distributed along the direction parallel to the axis of the reboiler. Referring to Figure 4 The upper shell pass baffle 19 and the lower shell pass baffle 20 are shown, and holes are arranged on the upper shell pass baffle 19 and the lower shell pass baffle 20, so that each medium tube of the medium outlet liquid phase tube bundle can pass through the upper shell pass baffle 19 and the lower shell pass baffle 20.

[0046] Through setting the upper shell pass baffle 19 and the lower shell pass baffle 20, the heat transfer efficiency of the kettle liquid and the outer wall surface of the tube is enhanced, the shell pass kettle liquid and the tube pass condensate liquid are arranged in countercurrent, and the heat transfer temperature difference of the fluid outside the tube and the outer wall surface of the tube is further reduced.

[0047] Referring to Figure 6 The bottom of the lower shell pass baffle 20 is provided with a liquid passing gap 21. The lowest part of the lower shell pass baffle 20 is processed with an "∧" shaped liquid passing gap 21, so that the flow dead zone existing in the up and down flow diversion process of the shell pass kettle liquid is reduced.

[0048] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A reboiler, characterized in that, It includes a media tube bundle (1), a gas-liquid separation structure, an evaporation space (2), and a preheating space (3), wherein, The media tubes of the media tube bundle (1) are respectively distributed in the evaporation space (2) and the preheating space (3). The media tube bundle (1) is connected to the gas-liquid separation structure and the liquid phase medium formed after passing through the gas-liquid separation structure can flow into the media tubes in the preheating space (3). The preheating space (3) is connected to the kettle liquid inlet (4) of the reboiler and the kettle liquid entering through the kettle liquid inlet (4) can flow through the preheating space (3) to the evaporation space (2).

2. The reboiler according to claim 1, characterized in that, The medium tube bundle (1) includes an inlet medium tube bundle and an outlet medium tube bundle. One end of the inlet medium tube bundle and the outlet medium tube bundle are respectively connected to the tube side gas inlet (5) and the tube side liquid outlet (6) of the reboiler. The other end of the inlet medium tube bundle and the outlet medium tube bundle are both connected to the gas-liquid separation structure. The outlet medium tube bundle is divided into an outlet medium liquid phase tube bundle and an outlet medium gas phase tube bundle. The outlet medium liquid phase tube bundle is located in the preheating space (3), and the outlet medium gas phase tube bundle and the inlet medium tube bundle are located in the evaporation space (2). The gas phase medium formed after passing through the gas-liquid separation structure can flow into the outlet medium gas phase tube bundle.

3. The reboiler according to claim 2, characterized in that, The gas-liquid separation structure includes a gas-liquid separation component. A gas-liquid separation chamber (8) is formed between the gas-liquid separation structure and the shell (7) of the reboiler. The gas-liquid separation component is located inside the gas-liquid separation chamber (8). The medium entering the gas-liquid separation chamber (8) can achieve gas-liquid gravity sedimentation separation through the gas-liquid separation component.

4. The reboiler according to claim 3, characterized in that, The inlet medium tube bundle is connected to the upper space of the gas-liquid separation component. An inlet is formed at the top of the gas-liquid separation component. The outlet medium liquid phase tube bundle is connected to the lower space of the gas-liquid separation component. A filter hole (12) is provided at the bottom of the gas-liquid separation component. The outlet medium gas phase tube bundle is connected to the space inside the gas-liquid separation component.

5. The reboiler according to claim 4, characterized in that, The gas-liquid separation component includes an upper baffle (9), a tube-side filter plate (10), and a tube-side baffle (11). The upper baffle (9) is disposed above the tube-side filter plate (10) and the two are spaced apart. There is a gap between the side of the upper baffle (9) away from the medium tube bundle (1) and the gas-liquid separation chamber (8) to form the inlet. The tube-side filter plate (10) is distributed with filter holes (12). Multiple tube-side baffles (11) are alternately distributed on the upper baffle (9) and the tube-side filter plate (10) to form a tortuous flow channel between the upper baffle (9) and the tube-side filter plate (10).

6. The reboiler according to claim 3, characterized in that, The gas-liquid separation structure further includes a right tube sheet (13), an upper sealing plate (14), and an overflow weir (15). The overflow weir (15) is located on the side of the right tube sheet (13) away from the medium tube bundle (1). One end of the medium tube bundle (1) is inserted into the right tube sheet (13). The upper sealing plate (14) connects the right tube sheet (13) and the upper sealing plate (14). The right tube sheet (13), the upper sealing plate (14), the overflow weir (15), and the shell (7) of the reboiler form the gas-liquid separation chamber (8).

7. The reboiler according to claim 2, characterized in that, The reboiler includes a left tube sheet (16) and a tube-side partition (17). One end of the medium tube bundle (1) is connected to the left tube sheet (16). The tube-side partition (17) divides the space on the left side of the left tube sheet (16) into an upper space connected to the tube-side air inlet (5) and a lower space connected to the tube-side liquid outlet (6). The inlet medium tube bundle is connected to the upper space, and the outlet medium tube bundle is connected to the lower space.

8. The reboiler according to any one of claims 1-7, characterized in that, The reboiler also includes a shell-side baffle (18), which is disposed inside the shell (7) of the reboiler and one end of the shell-side baffle (18) is connected to the left tube sheet (16) inside the shell (7). There is a gap between the end of the shell-side baffle (18) near the gas-liquid separation structure and the gas-liquid separation structure. The space above the shell-side baffle (18) is the evaporation space (2), and the space below the shell-side baffle (18) is the preheating space (3).

9. The reboiler according to claim 8, characterized in that, The reboiler also includes a turbulence structure disposed below the shell side baffle (18) to increase the time for the liquid to flow through the preheating space (3).

10. The reboiler according to claim 9, characterized in that, The turbulence structure includes an upper shell-side baffle (19) and a lower shell-side baffle (20). The upper shell-side baffle (19) is connected to the lower plate surface of the shell-side baffle (18) and has a gap with the inner side surface of the bottom of the shell (7). The lower shell-side baffle (20) is connected to the inner side surface of the bottom of the shell (7) and has a gap with the lower plate surface of the shell-side baffle (18). Multiple upper shell-side baffles (19) and lower shell-side baffles (20) are alternately distributed along a direction parallel to the axis of the reboiler.

11. The reboiler according to claim 10, characterized in that, The bottom of the lower shell baffle (20) is provided with a liquid overflow notch (21).

Images