Rectifying tower with efficient energy-saving thermal coupling structure
By introducing a central vertical column, isolation sleeve, and staggered packing structure into the distillation column, efficient separation and re-distillation of materials are achieved, solving the shortcomings of multi-stage distillation columns in terms of energy saving, reducing energy consumption and production costs.
Patent Information
- Application Number
- CN202520687909.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-04-14
AI Technical Summary
There is still room for improvement in the energy-saving effect of existing multi-stage thermally coupled distillation columns, especially since the energy consumption of a single column has not been fully optimized.
The design employs a thermally coupled structure consisting of a central vertical cylinder, an isolation sleeve, and multiple sets of packing bodies. The central vertical cylinder and isolation sleeve form an annular secondary downward flow and a tertiary upward flow channel. Combined with the staggered arrangement of the packing bodies, it achieves efficient separation and re-distillation of materials, reduces the degree of material backmixing, and utilizes the side outlet and cooler for cooling.
It effectively reduces energy consumption in the distillation process, improves the energy-saving effect of a single tower, and reduces production costs.
Smart Images
Figure CN223969516U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical equipment technology, specifically to a distillation column with a high-efficiency and energy-saving thermal coupling structure. Background Technology
[0002] Multi-stage heat-coupled distillation columns divide the entire distillation process into multiple columns with different energy levels. The overhead vapor from the higher-temperature column heats the reboiler of the lower-temperature column, while simultaneously condensing the vapor. In multi-effect distillation, only the bottom of the first column requires high-pressure steam for heating, and the overhead vapor of the last column is condensed using a cooling medium. The remaining columns no longer require external heating or cooling, resulting in significant energy savings. Building upon this, improving the energy efficiency of a single column has been a common concern in the industry, and this application addresses this issue. Utility Model Content
[0003] The purpose of this invention is to provide a distillation column with a reasonable structure, reliable operation, and a highly efficient and energy-saving thermal coupling structure, thereby further improving the energy-saving effect of a single distillation column and reducing production costs.
[0004] The technical solution of this utility model is:
[0005] A distillation column with a high-efficiency and energy-saving thermal coupling structure includes a distillation column body. The column body has a light component outlet at the top and a heavy component outlet at the bottom. The key technical features are: a lower horizontal baffle is provided at the bottom of the distillation column body, and an upper horizontal baffle is provided at the top. A central vertical cylinder is provided between the lower and upper horizontal baffles, with its lower end communicating with the lower space of the lower horizontal baffle. The upper horizontal baffle has a matrix of through holes corresponding to the central vertical cylinder. An isolation sleeve concentric with the central vertical cylinder is provided between the lower and upper horizontal baffles. An annular secondary downward flow channel is formed between the isolation sleeve and the outer surface of the central vertical cylinder. An annular tertiary upward flow channel is formed between the isolation sleeve and the inner circumferential surface of the distillation column body. The upper horizontal baffle has multiple downward flow ports corresponding to the annular secondary downward flow channel and multiple upward flow ports corresponding to the annular tertiary upward flow channel. From the inside out, the upper horizontal baffle has a first guide sleeve surrounding the matrix of through holes and a second guide sleeve surrounding each downward flow port. The distillation column is provided with a reflux pipe on the top side, and the inner end of the reflux pipe is inserted into the second guide sleeve. The central vertical cylinder is provided with a first set of packing bodies, the annular secondary downward channel is provided with a second set of packing bodies, and the annular tertiary upward channel is provided with a third set of packing bodies. The inner end of the feed pipe of the distillation column is connected to the lower end of the central vertical cylinder. The lower end of the isolation sleeve is provided with a side opening connecting the annular secondary downward channel and the annular tertiary upward channel.
[0006] The aforementioned distillation column with a high-efficiency and energy-saving thermal coupling structure comprises a third set of packing bodies consisting of upper, middle, and lower annular packing bodies. A first side-line outlet pipe is located on the outer peripheral wall of the distillation column between the upper and middle annular packing bodies. The outer end of the first side-line outlet pipe is connected to a first side pump body, and the outlet of the first side pump body is connected to a first side cooler. A second side-line outlet pipe is located on the outer peripheral wall of the distillation column between the middle and lower annular packing bodies. The outer end of the second side-line outlet pipe is connected to a second side pump body, and the outlet of the second side pump body is connected to a second side cooler.
[0007] In the aforementioned distillation column with a high-efficiency and energy-saving thermal coupling structure, the end of the outlet of the light component is connected to a top cooler, and the outlet pipe of the top cooler is connected to a reflux pipe and a light component output pipe, respectively.
[0008] The distillation column with the above-mentioned high-efficiency and energy-saving thermal coupling structure has the following features: the heavy component outlet of the distillation column body is connected to the inlet pipe of the bottom pump, the outlet pipe of the bottom pump is connected to the inlet of the bottom reboiler, the outlet pipe of the bottom reboiler is connected to the lower side wall of the lower horizontal baffle, and a heavy component guide pipe is provided on the outer peripheral wall of the distillation column body near the upper surface of the lower horizontal baffle. The heavy component guide pipe is higher than and connected to the inlet of the bottom reboiler, and a control valve is provided on the heavy component guide pipe.
[0009] The distillation column with the above-mentioned high-efficiency and energy-saving thermal coupling structure has a first group of packing bodies consisting of three packing bodies spaced apart along the height direction of the central vertical cylinder, and a second group of packing bodies consisting of two packing bodies spaced apart along the height direction of the annular secondary downflow channel. The first group of packing bodies and the second group of packing bodies are arranged alternately.
[0010] The beneficial effects of this utility model are:
[0011] During operation, the material enters the bottom of the distillation column. The light components rise along the central vertical cylinder, pass through the matrix-shaped through-holes, and then go to the light component outlet. After cooling, they flow back into the second guide sleeve and then enter the annular secondary downward flow channel through various downward flow ports. Some of the gaseous light components rise, while others descend to the bottom of the annular secondary downward flow channel and enter the annular tertiary upward flow channel. Finally, some of the gaseous light components continue to rise and go to the light component outlet through multiple upward flow ports. In this process, on the one hand, the reflux liquid does not enter the central vertical cylinder, effectively reducing the degree of material backmixing. On the other hand, the thermal coupling structure formed by the central vertical cylinder, isolation sleeve, lower horizontal baffle, and various packing components enables re-distillation, achieving the goal of saving energy and thus reducing production costs. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model;
[0013] In the diagram: 1. Light component outlet, 2. Distillation column body, 3. First guide sleeve, 4. Matrix-shaped through-hole, 5. Second guide sleeve, 6. Lower flow port, 7. Upper horizontal baffle, 8. Rising port, 9. Third packing body, 10. Second packing body, 11. First packing body, 12. Isolation sleeve, 13. Central vertical cylinder, 14. Feed pipe, 15. Lower horizontal baffle, 16. Heavy component outlet, 17. Bottom pump, 18. Bottom reboiler, 19. Heavy component inlet pipe, 20. Control valve, 21. Side opening, 22. Second side pump body, 23. Second side cooler, 24. First side pump body, 25. First side cooler, 26. Reflux line, 27. Top pump, 28. Top cooler. Detailed Implementation
[0014] The present invention will be described in detail with reference to the accompanying drawings.
[0015] like Figure 1 As shown, the distillation column with a high-efficiency and energy-saving thermal coupling structure includes a distillation column body 2, with a light component outlet 1 at the top and a heavy component outlet 16 at the bottom.
[0016] The distillation column 2 has a lower horizontal baffle 15 at its lower part and an upper horizontal baffle 7 at its upper part. A central vertical cylinder 13 is provided between the lower horizontal baffle 15 and the upper horizontal baffle 7. The lower end of the central vertical cylinder 13 is connected to the lower space of the lower horizontal baffle 15. The upper horizontal baffle 7 has a matrix of through holes 4 corresponding to the central vertical cylinder 13. An isolation sleeve 12 concentric with the central vertical cylinder 13 is provided between the lower horizontal baffle 15 and the upper horizontal baffle 7. An annular secondary downward flow channel is formed between the isolation sleeve 12 and the outer surface of the central vertical cylinder 13. An annular tertiary upward flow channel is formed between the isolation sleeve 12 and the inner circumferential surface of the distillation column 2.
[0017] The upper horizontal partition 7 is provided with multiple downward flow ports 6 corresponding to the annular secondary downward flow channel and multiple upward flow ports 8 corresponding to the annular tertiary upward flow channel. From the inside out, the upper horizontal partition 7 is provided with a first guide sleeve 3 surrounding the matrix-shaped through holes 4 and a second guide sleeve 5 surrounding each downward flow port 6. A reflux pipe 26 is provided on the top side of the distillation column body 2, and the inner end of the reflux pipe 26 is inserted into the second guide sleeve 5. The central vertical cylinder 13 is provided with a first set of packing bodies 11, the annular secondary downward flow channel is provided with a second set of packing bodies 10, and the annular tertiary upward flow channel is provided with a third set of packing bodies 9.
[0018] The inner end of the feed pipe 14 of the distillation column 2 is connected to the lower end of the central vertical cylinder 13, and the lower end of the isolation sleeve 12 is provided with a side opening 21 that connects the annular secondary downward flow channel and the annular tertiary upward flow channel.
[0019] In this embodiment, the third packing group 9 consists of three annular packing bodies: upper, middle, and lower. A first side outlet pipe is provided on the outer wall of the distillation column 2, located between the upper and middle annular packing bodies. The outer end of the first side outlet pipe is connected to a first side pump 24, and the outlet of the first side pump 24 is connected to a first side cooler 25. A second side outlet pipe is provided on the outer wall of the distillation column 2, located between the middle and lower annular packing bodies. The outer end of the second side outlet pipe is connected to a second side pump 22, and the outlet of the second side pump 22 is connected to a second side cooler 23. The first packing group 11 consists of three packing bodies spaced apart along the height direction of the central column. The second packing group 10 consists of two packing bodies spaced apart along the height direction of the annular secondary downward flow channel. The first packing group 11 and the second packing group 10 are arranged alternately, and the second packing group 10 and the third packing group 9 are also arranged alternately.
[0020] The end of the light component outlet 1 is connected to the top cooler 28. The outlet pipe of the top cooler 28 is connected to the reflux pipe 26 via the top pump 27, and is also connected to the light component output pipe. The heavy component outlet 16 of the distillation column 2 is connected to the inlet pipe of the bottom pump 17. The outlet pipe of the bottom pump 17 is connected to the inlet of the bottom reboiler 18. The outlet pipe of the bottom reboiler 18 is connected to the lower side wall of the lower horizontal baffle 15. A heavy component guide pipe 19 is provided on the outer peripheral wall of the distillation column 2 near the upper surface of the lower horizontal baffle 15. The heavy component guide pipe 19 is higher than and communicates with the inlet of the bottom reboiler 18. A control valve 20 is provided on the heavy component guide pipe 19.
[0021] Working principle:
[0022] 1. The material enters the bottom of the distillation column 2. The light component rises along the central vertical cylinder 13, passes through the first set of packing 11 and the matrix-shaped through holes 4, and then goes to the light component outlet 1. After being cooled by the top cooler 28, it flows back to the second guide sleeve 5, and then enters the annular secondary downward flow channel through various downward flow ports 6. During the flow through the second set of packing 10, part of the gaseous light component rises, and the other part descends to the bottom of the annular secondary downward flow channel and enters the annular tertiary upward flow channel. Finally, part of the gaseous light component continues to rise and passes through the third set of packing 9, and goes to the light component outlet 1 through multiple upward flow ports 8.
[0023] 2. The first side outlet pipe on the outer periphery of the distillation column 2 leads out the side product 1 through the first side pump 24 and is cooled by the first side cooler 25; the second side outlet pipe on the outer periphery of the distillation column 2 leads out the side product 2 through the second side pump 22 and is cooled by the second side cooler 23.
[0024] 3. After the operation is completed, the heavy components at the bottom of the distillation column 2 are discharged through the heavy component outlet 16, and the heavy components accumulated above the lower horizontal baffle 15 are drawn out through the heavy component guide pipe 19.
[0025] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this patent.
Claims
1. A rectifying tower with high-efficiency energy-saving thermal coupling structure, comprising a rectifying tower body, a light component outlet is arranged at the top of the rectifying tower body, and a heavy component outlet is arranged at the bottom of the rectifying tower body, characterized in that: The lower part of the rectifying tower body is provided with a lower horizontal partition, the upper part is provided with an upper horizontal partition, a central vertical cylinder is arranged between the lower horizontal partition and the upper horizontal partition, the lower end of the central vertical cylinder is in communication with the lower space of the lower horizontal partition, the upper horizontal partition is provided with a matrix-shaped through hole corresponding to the central vertical cylinder, an isolation sleeve concentric with the central vertical cylinder is arranged between the lower horizontal partition and the upper horizontal partition, an annular secondary downflow channel is formed between the isolation sleeve and the outer surface of the central vertical cylinder, an annular tertiary ascending channel is formed between the isolation sleeve and the inner circumferential surface of the rectifying tower body, the upper horizontal partition is provided with a plurality of downflow ports corresponding to the annular secondary downflow channel and a plurality of ascending ports corresponding to the annular tertiary ascending channel, the upper horizontal partition is sequentially provided with a first guide sleeve surrounding the matrix-shaped through hole and a second guide sleeve surrounding each downflow port from inside to outside, a reflux pipeline is arranged on the side of the top of the rectifying tower body, and the inner end of the reflux pipeline is inserted into the second guide sleeve, a first group of packing bodies are arranged in the central vertical cylinder, a second group of packing bodies are arranged in the annular secondary downflow channel, and a third group of packing bodies are arranged in the annular tertiary ascending channel, the inner end of the feed pipe of the rectifying tower body is in communication with the lower end of the central vertical cylinder, and the lower end of the isolation sleeve is provided with a side opening in communication with the annular secondary downflow channel and the annular tertiary ascending channel.
2. The rectifying column with high-efficiency energy-saving thermal coupling structure according to claim 1, characterized in that: The third group of packing bodies are composed of upper, middle and lower annular packing bodies, a first side line outlet pipeline is arranged on the outer circumferential wall of the rectifying tower body between the upper and middle annular packing bodies, the outer end of the first side line outlet pipeline is connected with a first side pump body, and the outlet of the first side pump body is connected with a first side cooler; a second side line outlet pipeline is arranged on the outer circumferential wall of the rectifying tower body between the middle and lower annular packing bodies, the outer end of the second side line outlet pipeline is connected with a second side pump body, and the outlet of the second side pump body is connected with a second side cooler.
3. The rectifying column with high-efficiency energy-saving thermal coupling structure according to claim 1, characterized in that: The end of the light component outlet is connected with a tower top cooler, and the outlet pipeline of the tower top cooler is connected with the reflux pipeline and the light component output pipeline respectively.
4. The rectifying column with high-efficiency energy-saving thermal coupling structure according to claim 1, characterized in that: The heavy component outlet of the rectifying tower body is connected with the inlet pipeline of a tower bottom pump, the outlet pipeline of the tower bottom pump is connected with the inlet of a tower bottom reboiler, the outlet pipeline of the tower bottom reboiler is connected with the side wall below the lower horizontal partition, a heavy component drainage pipe is arranged on the outer circumferential wall of the rectifying tower body close to the upper surface of the lower horizontal partition, the heavy component drainage pipe is higher than and in communication with the inlet of the tower bottom reboiler, and a control valve is arranged on the heavy component drainage pipe.
5. The rectifying column with high-efficiency energy-saving thermal coupling structure according to claim 1, characterized in that: The first group of packing bodies are composed of three packing bodies arranged at intervals along the height direction of the central vertical cylinder, the second group of packing bodies are composed of two packing bodies arranged at intervals along the height direction of the annular secondary downflow channel, and the first group of packing bodies and the second group of packing bodies are arranged alternately.