A rectification column kettle horizontal reboiler

Abstract

The utility model provides a rectifying column kettle horizontal reboiler relates to reboiler technical field, including reboiler casing, the fixed baffle in reboiler casing, the baffle will reboiler casing divide into chamber one and chamber two, install the heat exchange tube bundle on the baffle, the middle part of chamber two is provided with the weir, the bottom of chamber two is provided with liquid inlet pipe and liquid outlet pipe, the top of chamber two is provided with the steam pipe, the bottom of chamber two is provided with the overflow cover, the overflow cover from below to this is provided with a plurality of turbulence holes, the outer wall on straight pipe section is provided with spiral through slot. In the utility model, the bubble of heat exchange tube bundle can be washed transversely, makes it separate before the bubble forms gas film, avoids forming film boiling, keeps the heat exchange efficiency.

Description

Technical Field

[0001] This utility model relates to the field of reboiler technology, specifically a horizontal reboiler for the bottom of a distillation column. Background Technology

[0002] In the distillation process, the reboiler uses an external heat source to heat the liquid material flowing out from the bottom of the column, causing it to partially vaporize and boil. The generated vapor is sent back to the bottom of the distillation column and flows upward as gas in the opposite direction. It then undergoes sufficient mass and heat transfer with the liquid flowing back down from the top of the column on the trays to achieve the separation of components.

[0003] In horizontal reboilers, heat exchange is usually driven by natural circulation from the bottom feed. The liquid material flows slowly. During the heat exchange process between the liquid material in the shell side and the heat source in the tube side, the generated bubbles will adhere to the tube wall under the action of surface tension to form a vapor film, which is a manifestation of film boiling. This will seriously hinder heat transfer and cause a sharp drop in heat exchange efficiency. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a horizontal reboiler for distillation column bottoms, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A horizontal reboiler for a distillation column includes a reboiler shell. A partition is fixed inside the reboiler shell, dividing the reboiler shell into a first chamber and a second chamber. A heat exchange tube bundle is installed on the partition. A heat source inlet and a heat source outlet are provided on the upper and lower sides of the first chamber. A weir plate is provided in the middle of the second chamber. An inlet pipe and an outlet pipe are provided on the front and rear sides of the weir plate at the bottom of the second chamber. A steam pipe is provided at the top of the second chamber. An overflow hood is provided at the bottom of the second chamber. The overflow hood is fixed to the outside of the inlet pipe and is arc-shaped, fitting around the outer edge of the heat exchange tube bundle. Several turbulence holes are provided on the overflow hood from bottom to top, with the turbulence holes facing the heat exchange tube bundle.

[0009] Preferably, the overflow shroud is configured as a semi-circular shape, the uppermost turbulence hole is located on the upper side of the heat exchange tube bundle, the weir plate is higher than the overflow shroud, and the plurality of turbulence holes are configured as an axis facing the overflow shroud.

[0010] Preferably, the heat exchange tube assembly includes multiple sets of U-shaped heat exchange tubes, each U-shaped heat exchange tube comprising a straight tube section and a bent tube section. The partition plate is provided with several through holes, and the end of the straight tube section is fixed in the through hole and communicates with the chamber.

[0011] Preferably, a spiral groove is provided on the outer wall of the straight pipe section, and heat dissipation ribs are provided between the spiral grooves, with the spiral direction of the spiral grooves facing one side of the weir plate.

[0012] Preferably, the cross-section of the spiral channel is configured as a T-shaped channel, and the spiral channel includes an outer slit channel and an inner circular channel.

[0013] (III) Beneficial Effects

[0014] This invention provides a horizontal reboiler for a distillation column. It offers the following advantages:

[0015] 1. In this utility model, the intermediate-cooled liquid phase material is introduced into the overflow hood through the inlet pipe and flows out from the turbulence hole of the overflow hood at different heights and in opposite directions. While laterally scouring the heat exchange tube bundle for heat exchange, it forms turbulence, which can impact the air bubbles and cause them to detach from the straight section of the U-shaped heat exchange tube and be discharged from the steam pipe. This avoids the air bubbles from adhering to the tube wall and forming a steam film, thus ensuring heat exchange efficiency.

[0016] 2. The spiral grooves set in the straight section of the U-shaped heat exchange tube in this utility model can increase the heat exchange area of ​​the heat exchange tube bundle, improve the heat exchange efficiency, increase the thermosiphon force in the reheater, increase the flow velocity outside the U-shaped heat exchange tube, and increase the bubble detachment speed. In addition, bubble nuclei can be formed in the circular channel of the spiral groove, and quickly aggregate into large bubbles. Under the lateral scouring of the fluid, they move upward along the circular channel and detach at the top. The bubble nuclei enable the bubbles to detach from the wall before merging into a film, maintaining nucleation boiling.

[0017] 3. The slit channel set on the outer side of the T-shaped channel in this utility model can generate strong capillary force during the rise of the bubble, and continuously draw the external liquid phase material into the circular channel on the inner side of the T-shaped channel to form a liquid film, thus preventing dry spots from appearing in the T-shaped channel. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a horizontal reboiler in the bottom of a distillation column according to the present invention;

[0019] Figure 2 for Figure 1 A sectional view;

[0020] Figure 3 This is a schematic diagram of the overflow shroud in this utility model;

[0021] Figure 4This is a partial cross-sectional view of the straight pipe section in this utility model.

[0022] In the diagram: 1. Reboiler shell; 2. Baffle plate; 3. U-shaped heat exchange tube; 31. Straight tube section; 32. Bend section; 4. Weir plate; 5. Inlet pipe; 6. Outlet pipe; 7. Steam pipe; 8. Overflow hood; 9. Turbulence hole; 10. Spiral channel; 101. Slit channel; 102. Circular channel. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] This utility model provides a horizontal reboiler for a distillation column, such as... Figure 1-2 As shown, the device includes a reboiler shell 1, with a baffle 2 fixed inside the reboiler shell 1. The baffle 2 has several through holes, and a heat exchange tube bundle is fixed inside each through hole. The heat exchange tube bundle includes multiple sets of U-shaped heat exchange tubes 3. Each U-shaped heat exchange tube 3 includes a straight tube section 31 and a bent tube section 32. The baffle 2 divides the reboiler shell 1 into a first chamber and a second chamber. The straight tube section 31 is fixed inside the through holes and communicates with the first chamber. The outer wall of the U-shaped heat exchange tubes extends into the second chamber. The first chamber has a heat source inlet and a heat source outlet on its upper and lower sides. A flow divider is provided in the middle of the first chamber. After passing through the first chamber, the external heat source enters the upper straight tube section 31 under the obstruction of the flow divider and flows along the U-shaped heat exchange tubes 3 to the part of the first chamber located below the flow divider, where it exchanges heat with the liquid material in the second chamber.

[0025] A weir plate 4 is provided in the middle of the second chamber. The height of the weir plate 4 is higher than that of the heat exchange tube bundle, so that the liquid material can completely submerge the heat exchange tube bundle. An inlet pipe 5 and an outlet pipe 6 are provided at the bottom of the second chamber on the front and rear sides of the weir plate 4. A steam pipe 7 is provided at the top of the second chamber.

[0026] like Figure 2-3As shown, an overflow hood 8 is provided at the bottom of the second chamber. The overflow hood 8 is fixed to the outside of the inlet pipe 5. The overflow hood 8 is semi-arc-shaped and fits around the outer edge of the heat exchange tube bundle. An overflow cavity is formed between the overflow hood 8 and the lower side wall of the second chamber. Several turbulence holes 9 are arranged from bottom to top on the overflow hood 8. The turbulence holes 9 face the heat exchange tube bundle. The turbulence holes 9 are arranged along the axis facing the overflow hood 8. The liquid phase material introduced by the inlet pipe 5 is at the bottom of the overflow cavity. The overflow is spread evenly at the bottom of the overflow chamber and discharged uniformly from the turbulence holes 9, which then laterally impact the heat exchange tube bundle. The uppermost turbulence hole 9 is located on the upper side of the heat exchange tube bundle. The weir plate 4 is higher than the overflow hood 8, so that the liquid phase material in the turbulence hole 9 can be laterally flushed to any height of the heat exchange tube bundle. This can make the turbulence formed by flushing the heat exchange tube bundle more uniform and keep the formed turbulence lower than the weir plate 4, keeping the upper liquid surface calm, keeping the static pressure head stable, and thus keeping the boiling temperature stable.

[0027] like Figure 1 , Figure 4 As shown, a spiral groove 10 is provided on the outer wall of the straight pipe section 31. The cross-section of the spiral groove 10 is set as a T-shaped channel. The spiral direction of the spiral groove 10 faces one side of the weir plate 4. Heat dissipation fins are set between the spiral grooves 10. The heat dissipation fins can increase the heat exchange area of ​​the heat exchange tube bundle, improve the heat exchange efficiency, increase the temperature difference of the liquid phase material, enhance the thermosiphon phenomenon, increase the flow velocity near the U-shaped heat exchange tube 3, flush out bubbles, and improve the bubble release speed. The spiral groove 10 includes an outer slit channel 101 and an inner circular channel 102. The slit channel 101 The width of 01 is smaller than that of the circular channel 102. By setting the T-shaped channel, bubble nuclei can be formed in the circular channel 102, allowing the bubbles to quickly aggregate and grow. Under the lateral scouring of the fluid, the bubbles slide upward along the circular channel 102 and detach, allowing them to detach from the wall before merging into a film, thus maintaining nucleation boiling. In addition, during the continuous detachment of bubbles, a strong capillary effect is formed in the slit channel, drawing external liquid phase materials into the T-shaped channel to form a continuous liquid film. This prevents bubbles from contacting the heat exchange surface. Under the action of capillary suction, the liquid film is constantly replenished while steam is being formed, preventing the formation of dry spots.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A horizontal reboiler for a distillation column, comprising a reboiler shell, characterized in that: A partition plate is fixed inside the reboiler shell, dividing the reboiler shell into chamber one and chamber two. A heat exchange tube bundle is installed on the partition plate. A heat source inlet and a heat source outlet are provided on the upper and lower sides of chamber one. A weir plate is provided in the middle of chamber two. An inlet pipe and an outlet pipe are provided on the front and rear sides of the weir plate at the bottom of chamber two. A steam pipe is provided at the top of chamber two. An overflow hood is provided at the bottom of chamber two. The overflow hood is fixed to the outside of the inlet pipe. The overflow hood is arc-shaped and fits around the outer edge of the heat exchange tube bundle. Several turbulence holes are provided on the overflow hood from bottom to top, and the turbulence holes face the heat exchange tube bundle.

2. The horizontal reboiler for a distillation column according to claim 1, characterized in that: The overflow hood is configured as a semi-circular shape, with the uppermost turbulence hole located on the upper side of the heat exchange tube bundle. The height of the weir plate is higher than that of the overflow hood, and several of the turbulence holes are configured to face the axis of the overflow hood.

3. A horizontal reboiler for a distillation column according to claim 2, characterized in that: The heat exchange tube bundle includes multiple sets of U-shaped heat exchange tubes, each U-shaped heat exchange tube comprising a straight tube section and a bent tube section. The partition plate is provided with several through holes, and the end of the straight tube section is fixed in the through hole and communicates with the chamber.

4. A horizontal reboiler for a distillation column according to claim 3, characterized in that: The outer wall of the straight pipe section is provided with a spiral groove, and heat dissipation ribs are set between the spiral grooves. The spiral direction of the spiral groove is towards one side of the weir plate.

5. A horizontal reboiler for a distillation column according to claim 4, characterized in that: The cross-section of the spiral channel is set as a T-shaped channel, and the spiral channel includes an outer slit channel and an inner circular channel.

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