Reboiler and rectification system

Abstract

The utility model provides a reboiler and rectification system relates to heating vaporizing equipment technical field, said reboiler includes shell and heating device, heating device includes electric heater, heating device and shell detachable connection, and the heating device is located in the shell at least partially to be used for heating the medium in the shell. Tower bottoms in the tower enter the shell, are heated by the heating device and then return to the tower, so that the tower bottoms are heated and vaporized. At least part of the heating device is positioned in the shell and is detachably connected with the shell, so that the heating device can be in direct contact with a medium to be heated, such as tower kettle liquid, the heating efficiency is higher, and the cleaning and the maintenance are more convenient; meanwhile, at least part of the heating device adopts an electric heater form, and electric energy is converted into heat energy to heat the medium, so that the heating efficiency can be further improved, the energy is cleaner, and the problem of higher carbon emission can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heating vaporization equipment, in particular to a reboiler and a distillation system. Background Art

[0002] The reboiler is a liquid heating and vaporization equipment, which is generally installed at the bottom of the tower and connected to the tower through a pipe. The bottom liquid in the tower enters the reboiler through the pipe. After being heated and vaporized inside the reboiler, the gas-liquid mixture returns to the tower through the pipe, realizing the heating and vaporization of the bottom liquid in the tower.

[0003] The existing reboiler generally includes a shell and a heating tube welded and fixed inside the shell. The bottom liquid is filled into the interior of the heating tube. A heating medium such as steam or hot water is provided in the shell. The bottom liquid in the heating tube is heated and vaporized by the heating medium. On the one hand, the shell and the heating tube are welded and fixed, which is inconvenient to clean and maintain. On the other hand, the bottom liquid is heated by a heating medium such as steam or hot water, and the heating efficiency is low, and there is a problem of high carbon emissions and environmental pollution. Utility Model Content

[0004] The utility model aims to solve the technical problems of low heating efficiency and inconvenient cleaning and maintenance of the existing reboiler.

[0005] On the one hand, the utility model provides a reboiler, including a shell and a heating device, wherein the heating device includes an electric heater, the heating device is detachably connected to the shell and is at least partially located inside the shell to heat the medium inside the shell.

[0006] Optionally, the heating device includes a plurality of heaters arranged at intervals along the up-down direction of the shell, and the plurality of heaters include at least one electric heater.

[0007] Optionally, an inlet and an outlet are respectively provided at the upper and lower ends of the shell, and the plurality of heaters are located between the outlet and the inlet.

[0008] Optionally, the shell is provided with a plurality of mounting openings along the up-down direction, and the plurality of heaters are respectively mounted on the shell through the corresponding mounting openings.

[0009] Optionally, the plurality of mounting openings are distributed on both sides of the housing and are staggered;

[0010] Alternatively, the plurality of mounting openings are respectively arranged in different directions along the circumference of the shell.

[0011] Optionally, the electric heater includes an electric heating tube and a junction box, the junction box is arranged outside the shell and has a tube sheet at one end facing the inside of the shell, the tube sheet is located in the installation port, the electric heating tube is arranged in the shell, and one end of the electric heating tube passes through the tube sheet to extend into the junction box.

[0012] Optionally, the reboiler also includes a liquid level measuring structure and a control box, wherein the liquid level measuring structure is used to measure the liquid level inside the shell, the liquid level measuring structure and the plurality of heaters are respectively connected to the control box signal, and the control box is configured to turn on or off the corresponding heater according to the measurement result of the liquid level measuring structure.

[0013] Optionally, the liquid level measurement structure includes a connecting tube, which is located outside the shell, and the side wall of the shell is provided with a first opening and a second opening at intervals along the up and down directions, and both ends of the connecting tube are respectively connected to the first opening and the second opening.

[0014] Optionally, a drain port is provided at the bottom of the shell, and the height of the drain port is lower than the height of the inlet;

[0015] And / or, the shell comprises a cylinder, an upper head and a lower head, the upper and lower ends of the cylinder are open, the upper head and the lower head are respectively arranged at the open ends of the cylinder, the upper head, the cylinder and the lower head are connected to form a sealed space, the inlet is arranged on the lower head or the cylinder, and the outlet is arranged on the upper head;

[0016] And / or, it also includes a supporting leg, wherein the supporting leg is used to support the shell.

[0017] On the other hand, the utility model provides a distillation system, comprising the above-mentioned reboiler.

[0018] The reboiler and distillation system of the utility model have at least the following advantages compared with the prior art:

[0019] The shell of the reboiler is used to circulate the medium to be heated (bottom liquid), that is, the medium to be heated enters the shell through the shell inlet and flows out from the shell outlet after vaporization. At least part of the heating device is located in the shell and the medium to be heated in the shell can be in direct contact with the heating device to be heated and vaporized. Compared with the prior art, a heating pipe for circulating the medium to be heated is arranged in a shell through which hot water or water vapor is passed, and the medium in the heating pipe is indirectly heated by hot water or water vapor. The heating method provided in this embodiment has a higher heating efficiency. At the same time, at least part of the heating device in this embodiment adopts an electric heater, which converts electrical energy into thermal energy to directly heat the medium, which can not only further improve the heating efficiency, but also make the energy cleaner and avoid the problem of high carbon emissions. In addition, the heating device is detachably connected to the shell, which can make the disassembly and cleaning of the reboiler more convenient and facilitate the maintenance of the reboiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A first structural schematic diagram of a reboiler according to an embodiment of the utility model;

[0021] Figure 2 A second structural schematic diagram of a reboiler according to an embodiment of the utility model;

[0022] Figure 3 A third structural schematic diagram of a reboiler according to an embodiment of the utility model;

[0023] Figure 4 It is a schematic structural diagram of an electric heater according to an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1. Shell; 11. Cylinder; 111. Installation section; 112. First opening; 113. Second opening; 12. Upper head; 121. Outlet; 13. Lower head; 131. Inlet; 132. Drain port; 2. Electric heater; 21. Electric heating tube; 22. Junction box; 221. Tube sheet; 222. Installation flange; 3. U-shaped heat exchange tube; 4. Support leg. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "matched" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, it should be noted that in the description of the present invention, it should be noted that the terminology nouns in the various embodiments, such as "upper", "lower", "front", "back" and other words indicating directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the components and devices referred to must be operated in accordance with the specific directions and specified operations and methods and structures in the specification. Such directional nouns do not constitute a limitation on the present invention.

[0029] In this article, an XZ coordinate system is established, in which the positive direction of the X axis represents the left, the negative direction of the X axis represents the right, the positive direction of the Z axis represents the top, and the negative direction of the Z axis represents the bottom. It should be noted that the aforementioned X-axis and Z-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0030] like Figure 1-Figure 3 As shown, a reboiler according to an embodiment of the utility model comprises a shell 1 and a heating device, wherein the heating device comprises an electric heater 2, the heating device is detachably connected to the shell 1, and is at least partially located inside the shell 1, so as to heat the medium inside the shell 1.

[0031] Specifically, the heating device can be installed in the shell 1 by a detachable installation method such as snaps and bolts. The heating element of the electric heater is a resistance wire or a resistance sheet. When power is turned on, current flows through the resistance wire or the resistance sheet, generating heat, and stops generating heat when power is turned off.

[0032] In this embodiment, the shell of the reboiler is used to circulate the medium to be heated (bottom liquid), that is, the medium to be heated enters the shell 1 through the shell inlet and can flow out from the shell outlet after vaporization. The heating device must be at least partially located inside the shell 1, and the medium in the shell 1 can be in direct contact with the heating device to be heated and vaporized. Compared with the prior art, in which a heating pipe for circulating the medium to be heated is arranged in a shell through which hot water or water vapor is passed, and the medium in the heating pipe is indirectly heated by hot water or water vapor, the heating method provided by this embodiment has a higher heating efficiency. At the same time, at least part of the heating device in this embodiment adopts the form of an electric heater 2, which converts electrical energy into thermal energy to directly heat the medium, which can not only further improve the heating efficiency, but also make the energy cleaner and avoid the problem of high carbon emissions. In addition, the heating device is detachably connected to the shell 1, which can make the disassembly and cleaning of the reboiler more convenient and facilitate the maintenance of the reboiler.

[0033] like Figure 2-Figure 3 As shown, optionally, the heating device includes a plurality of heaters spaced apart along the up-down direction of the shell 1 , and the plurality of heaters include at least one electric heater 2 .

[0034] In this embodiment, the Z-direction height of the shell 1 is relatively high. For example, the reboiler can be a vertical reboiler. The shell 1 is arranged vertically, that is, arranged along the Z-direction. A plurality of heaters are provided, and the plurality of heaters are arranged at intervals along the Z-direction. The heaters are arranged in parallel with each other, and the heaters are independently controlled. The arrangement of a plurality of heaters increases the bandwidth of the heating power, and can ensure the heating efficiency and improve the energy utilization rate. For example, as the bottom liquid continuously enters the interior of the shell 1, the switches of the heaters can be adjusted according to the liquid level height of the bottom liquid entering the shell 1, so that all the heaters below the liquid level are turned on, and the other heaters are turned off. While ensuring the heating efficiency, it is possible to avoid the heaters from burning empty, thereby improving the energy utilization rate and reducing the carbon emission.

[0035] Specifically, the combination type of the plurality of heaters is not limited.

[0036] For example, the heating device includes a plurality of electric heaters 2 spaced apart in the vertical direction of the shell 1, that is, all electric heaters are used, which can improve the heating efficiency as much as possible and reduce carbon emissions.

[0037] For another example, the heating device includes an electric heater 2 arranged at intervals along the upper and lower directions of the shell 1 and a traditional heater other than the electric heater 2, such as a U-shaped heat exchange tube 3, steam or hot water can be passed into the U-shaped heat exchange tube 3, and the U-shaped heat exchange tube 3 can be connected to an external heat source. One or more U-shaped heat exchange tubes 3 can be provided. When only one U-shaped heat exchange tube 3 is provided, the U-shaped heat exchange tube 3 can be located between two adjacent electric heaters 2. When multiple U-shaped heat exchange tubes 3 are provided, the electric heater 2 and the U-shaped heat exchange tube 3 can be alternately arranged along the Z direction. The tower bottom liquid is located in the shell 1 outside the U-shaped heat exchange tube 3, and the heat carried by the steam or hot water in the U-shaped heat exchange tube 3 is used to heat the tower bottom liquid. When the power is insufficient, the U-shaped heat exchange tube 3 can be used to heat the tower bottom liquid, and when the power is sufficient, the electric heater 2 can be used to heat the tower bottom liquid. Different heating methods can be reasonably selected according to different environmental conditions to ensure heating efficiency.

[0038] Of course, in some other embodiments, when the Z-height of the shell 1 of the vertical reboiler is relatively short or the reboiler is arranged horizontally, the heating device may include only one electric heater 2 .

[0039] Optionally, an inlet 131 and an outlet 121 are respectively provided at the upper and lower ends of the shell 1 , and the plurality of heaters are located between the outlet 121 and the inlet 131 .

[0040] Specifically, the shell is arranged vertically, and the inlet 131 at the lower end of the shell 1 is used for the bottom liquid to enter, and the outlet 121 of the shell 1 is located at the upper end of the shell 1. The heated and vaporized gas-liquid mixture flows upward and is discharged from the outlet 121. Each heater is arranged between the inlet 131 and the outlet 121. The gas-liquid mixture can pass through multiple heaters in sequence before being discharged from the outlet 121, so as to improve the effective utilization rate of multiple heaters and thus improve the energy utilization rate.

[0041] like Figure 2-Figure 3 As shown, optionally, a plurality of mounting openings are provided on the shell 1, and a plurality of the heaters are respectively mounted on the shell 1 through the corresponding mounting openings.

[0042] Specifically, multiple heaters are matched with the shapes of corresponding mounting ports respectively. The mounting port can be a rectangular port. The wires of the electric heater 2 can extend from the corresponding mounting port and be connected to an external power source. The U-shaped heat exchange tube 3 can be connected to an external heat source through the mounting port.

[0043] In this embodiment, by providing a mounting opening on the side wall of the housing 1, each heater can be conveniently disassembled.

[0044] like Figure 2-Figure 3 As shown, optionally, the plurality of mounting openings are distributed on both sides of the shell 1 and are staggered; or the plurality of mounting openings are arranged toward different directions of the shell 1 .

[0045] Specifically, when there are two mounting openings, the two mounting openings are spaced apart along the Z direction, and one mounting opening is located on the left side of the shell 1, and the other is located on the right side of the shell 1; when there are four mounting openings, the four mounting openings are respectively located on the front, rear, left and right side walls of the shell 1, or, two of the mounting openings are located on the left side of the shell 1, and the other two are located on the right side of the shell 1, and the mounting opening on the left side of the shell 1 and the mounting opening on the right side of the shell 1 are staggered in the Z direction.

[0046] The installation openings are arranged in different directions, or are staggered on the left and right sides of the shell 1, so that each heater is installed in a different direction, and the stress distribution of the shell 1 is more uniform, avoiding excessive concentration of stress on one side of the shell 1 and causing failure and damage of the reboiler.

[0047] like Figure 4 As shown, optionally, the electric heater 2 includes an electric heating tube 21 and a junction box 22, the junction box 22 is arranged outside the shell 1 and is provided with a tube sheet 221 at one end facing the inside of the shell 1, the tube sheet 221 is located in the installation port, the electric heating tube 21 is arranged in the shell 1, and one end of the electric heating tube 21 passes through the tube sheet 221 to extend into the junction box 22.

[0048] Specifically, a hollow columnar mounting section 111 is formed at the outer edge of the mounting opening of the housing 1 , and the junction box 22 matches the inner wall shape of the mounting section 111 . The junction box 22 can be detachably mounted on the mounting section 111 via a mounting flange 222 .

[0049] Taking the installation opening on the left side of the housing 1 as an example, a circuit board can be arranged inside the junction box 22, and a tube sheet 221 is arranged at one end of the junction box 22 close to the inside of the housing 1, that is, the right end of the junction box 22, and the electric heating tube 21 is arranged horizontally, and the right end of the electric heating tube 21 is arranged with a gap with the corresponding side wall on the right side of the housing 1, and the left end of the electric heating tube 21 passes through the tube sheet 221 and extends into the junction box 22. The outer wall of the housing 1 is provided with an installation section 111 at a position corresponding to the installation opening, and one end of the junction box 22 is inserted into the installation section 111, and the tube sheet 221 is located in the installation opening, and the shape of the tube sheet 221 matches the shape of the installation opening.

[0050] In this embodiment, the junction box 22 is provided with a connection port, which is connected to an external power source through the connection port to realize the electric heating tube 21. The tube sheet 221 is located in the installation port, which can block the installation port to prevent the liquid inside the shell 1 from flowing out. At the same time, compared with the tube sheet 221 being located in the installation section 111, it can prevent the dead zone between the tube sheet 221 and the installation section 111 from scaling and causing equipment corrosion, thereby ensuring the safety of the equipment.

[0051] Optionally, the reboiler also includes a liquid level measuring structure and a control box, wherein the liquid level measuring structure is used to measure the liquid level inside the shell 1, and the liquid level measuring structure and the plurality of heaters are respectively connected to the control box signal, and the control box is configured to turn on or off the corresponding heater according to the measurement result of the liquid level measuring structure.

[0052] In this embodiment, when the bottom liquid is injected into the interior of the shell 1 through the inlet 131, the liquid level measurement structure measures the liquid level height inside the shell 1 in real time, and transmits the liquid level information to the control box. The control box turns on the heater below the liquid level and turns off the heater above the liquid level based on the liquid level information, thereby realizing intelligent control of multiple heaters 2, ensuring heating efficiency while avoiding empty burning of the heaters, thereby improving energy utilization and reducing carbon emissions.

[0053] like Figure 1-Figure 2 As shown, optionally, the liquid level measurement structure includes a connecting tube, which is located outside the shell 1, and the side wall of the shell 1 is provided with a first opening 112 and a second opening 113 spaced apart in the up and down directions, and the two ends of the connecting tube are respectively connected to the first opening 112 and the second opening 113.

[0054] In this embodiment, the connecting tube can be a U-shaped transparent tube, on which scale lines can be marked. The first opening 112 and the second opening 113 are located on the same vertical line. The two ends of the connecting tube are respectively connected to the first opening 112 and the second opening 113 to form a communicating vessel. The first opening 112 is below the second opening 113. The liquid in the shell 1 can enter the connecting tube from the first opening 112. The liquid level height in the connecting tube is the same as the liquid level height in the shell 1. By observing the liquid level height in the connecting tube, the height of the bottom liquid inside the shell 1 can be obtained, so that the corresponding heater can be turned on.

[0055] In other embodiments, the liquid level measurement structure may also be disposed in the housing 1, such as a float level gauge, a pressure level gauge, an ultrasonic level gauge, etc.

[0056] like Figure 1-Figure 3 As shown, optionally, a drain port 132 is provided at the bottom of the housing 1, and the height of the drain port 132 is lower than the height of the inlet 131;

[0057] And / or, the shell 1 includes a cylinder 11, an upper head 12 and a lower head 13, the upper and lower ends of the cylinder 11 are open, the upper head 12 and the lower head 13 are respectively arranged at the open ends of the cylinder 11, the upper head 12, the cylinder 11 and the lower head 13 are connected to form a sealed space, the inlet 131 is arranged on the lower head 13 or the cylinder 11, and the outlet 121 is arranged on the upper head 12;

[0058] And / or, it further includes a supporting leg 4, wherein the supporting leg 4 is used to support the shell 1.

[0059] Specifically, the bottom of the shell 1 may be conical or arc-shaped, and a drain port 132 is provided at the bottom of the shell 1 below the inlet 131. The drain port 132 may be located at the lowest position of the bottom of the shell 1, so as to drain the liquid in the shell 1 smoothly and facilitate cleaning of the inside of the shell 1.

[0060] The cylinder 11 of the shell 1 is cylindrical, the upper head 12 and the lower head 13 may be arc-shaped structures, the top of the upper head 12 is provided with an outlet 121, the bottom of the lower head 13 is provided with a drain port 132, and the side wall of the lower head 13 or the lower side wall of the cylinder 11 is provided with an inlet 131. The upper head 12, the cylinder 11 and the lower head 13 are respectively formed and then welded and fixed to form a sealed space, the forming method is simple and the sealing performance is good. The bottom liquid is heated and vaporized in the sealed space to avoid the risk of leakage.

[0061] The support legs 4 are arranged vertically, the upper ends of the support legs 4 are fixedly connected to the side walls of the shell 1, and the lower ends of the support legs 4 can be fixed to the ground by anchor bolts to support and fix the reboiler. According to the size of the shell 1, three or four support legs 4 can be arranged, and the support legs 4 are evenly spaced and distributed along the circumference of the shell 1, so that the force is more evenly distributed.

[0062] Another embodiment of the present invention provides a distillation system, including the above-mentioned reboiler. The reboiler is connected to a tower, which can be a distillation tower. The advantages of the distillation system compared to the prior art are the same as those of the above-mentioned reboiler, and will not be repeated.

[0063] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A reboiler, characterized in that: The invention comprises a shell (1) and a heating device, wherein the heating device comprises an electric heater (2), the heating device is detachably connected to the shell (1) and is at least partially located inside the shell (1) so as to heat a medium inside the shell (1).

2. The reboiler according to claim 1, characterized in that The heating device comprises a plurality of heaters arranged at intervals along the up-down direction of the shell (1), and the plurality of heaters comprises at least one electric heater (2).

3. The reboiler according to claim 2, characterized in that An inlet (131) and an outlet (121) are respectively provided at the upper and lower ends of the shell (1), and the plurality of heaters are located between the outlet (121) and the inlet (131).

4. The reboiler according to claim 2, characterized in that: The shell (1) is provided with a plurality of mounting openings along the up-down direction, and the plurality of heaters are respectively mounted on the shell (1) through the corresponding mounting openings.

5. The reboiler according to claim 4, characterized in that The plurality of mounting openings are distributed on both sides of the housing (1) and are arranged in a staggered manner; Alternatively, the plurality of mounting openings are respectively arranged towards different directions of the circumference of the shell (1).

6. The reboiler according to claim 4, characterized in that The electric heater (2) comprises an electric heating tube (21) and a junction box (22); the junction box (22) is arranged outside the shell (1) and is provided with a tube sheet (221) at one end facing the inside of the shell (1); the tube sheet (221) is located in the installation opening; the electric heating tube (21) is arranged in the shell (1), and one end of the electric heating tube (21) passes through the tube sheet (221) to extend into the junction box (22).

7. The reboiler according to claim 2, characterized in that It also includes a liquid level measurement structure and a control box, wherein the liquid level measurement structure is used to measure the liquid level inside the shell (1), the liquid level measurement structure and each of the heaters are respectively connected to the control box signal, and the control box is configured to turn on or off the corresponding heater according to the measurement result of the liquid level measurement structure.

8. The reboiler according to claim 7, characterized in that The liquid level measurement structure comprises a connecting pipe, the connecting pipe is located outside the shell (1), a first opening (112) and a second opening (113) are arranged at intervals along the up-down direction on the side wall of the shell (1), and two ends of the connecting pipe are respectively connected to the first opening (112) and the second opening (113).

9. The reboiler according to claim 3, characterized in that: The bottom of the housing (1) is provided with a drain port (132), and the height of the drain port (132) is lower than the height of the inlet (131); And / or, the shell (1) comprises a cylinder (11), an upper head (12) and a lower head (13); the upper and lower ends of the cylinder (11) are open; the upper head (12) and the lower head (13) are respectively arranged at the open ends of the cylinder (11); the upper head (12), the cylinder (11) and the lower head (13) are connected to form a sealed space; the inlet (131) is arranged on the lower head (13) or the cylinder (11); and the outlet (121) is arranged on the upper head (12); And / or, it also includes a supporting leg (4), wherein the supporting leg (4) is used to support the shell (1).

10. A distillation system, characterized in that: Comprising the reboiler as described in any one of claims 1 to 9.

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