Rectifying tower capable of recycling heat energy

Abstract

The utility model discloses a rectifying tower capable of recycling heat energy, which relates to the technical field of rectifying towers and comprises a first rectifying tower and a second rectifying tower, supporting legs are mounted at the bottoms of the first rectifying tower and the second rectifying tower, and observation ports are arranged on the front end faces of the first rectifying tower and the second rectifying tower. The first rectifying tower is communicated with a first valve group, a first heat exchanger and a first return tank through pipelines, the first return tank is connected with a first shield pump through a pipeline, the first heat exchanger is communicated with a second valve group, a third valve group and a second return tank through pipelines, and the second valve group is communicated with a second shield pump through a pipeline. According to the scheme, the problems that in the prior art, rectifying towers are single in operation process, independent in function and free of mutual influence, gradient utilization of energy does not exist, and each tower needs an independent heat source for energy supply, so that the overall energy demand is large, and energy consumption is high are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation columns, in particular to a distillation column capable of recycling heat energy. Background Technique

[0002] A distillation column is a tower-type gas-liquid contact device for distillation. By utilizing the property that each component in a mixture has different volatilities, that is, the vapor pressures of each component are different at the same temperature, the light components in the liquid phase are transferred to the gas phase, while the heavy components in the gas phase are transferred to the liquid phase, so as to achieve the purpose of separation. The distillation column is also a mass transfer and heat transfer device widely used in petrochemical production.

[0003] For example, the Chinese authorized patent (efficient distillation column) with the publication number of CN214105870U: It includes a frame body, a distillation column body and a lifting device. The distillation column body is located on the frame body, and the lifting device is located inside the distillation column body. The lifting device includes two cleaning rings, two bidirectional screws and a driving mechanism. The bidirectional screws penetrate through the cleaning rings. The cleaning rings are closely attached to the inner wall of the distillation column body and are parallel. The bidirectional screws are arranged along the height direction of the distillation column body. One end of the bidirectional screw is rotatably connected to the distillation column body, and the other end penetrates through the distillation column body and is connected to the driving mechanism. Through the lifting device, the cleaning rings reciprocate along the inner wall of the distillation column body, continuously cleaning the inner wall of the distillation column body, reducing the labor input and improving the reaction efficiency.

[0004] However, the operation process of the above-mentioned existing distillation columns is single and the functions are independent. They do not affect each other and there is no cascaded utilization of energy. Usually, each column needs an independent heat source for energy supply, resulting in a large overall energy demand and high energy consumption. Therefore, it does not meet the existing requirements. For this reason, we propose a distillation column capable of recycling heat energy. Content of the Utility Model

[0005] The purpose of the utility model is to provide a distillation column capable of recycling heat energy, so as to solve the problems in the prior art that the operation process of the distillation column is single and the functions are independent, they do not affect each other, there is no cascaded utilization of energy, and usually each column needs an independent heat source for energy supply, resulting in a large overall energy demand and high energy consumption.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A rectification column capable of recycling heat energy, comprising a first rectification column and a second rectification column. Support feet are installed at the bottoms of the first rectification column and the second rectification column. Observation ports are provided on the front faces of the first rectification column and the second rectification column. The first rectification column is connected to a first valve group, a first heat exchanger, and a first reflux tank through pipelines. The first reflux tank is connected to a first canned motor pump through a pipeline. The first heat exchanger is connected to a second valve group, a third valve group, and a second reflux tank through pipelines. The second valve group is connected to a second canned motor pump through a pipeline. The third valve group is connected to a second heat exchanger and the second rectification column through pipelines.

[0007] Preferably, air inlets are provided on one side of the bottoms of the first rectification column and the second rectification column, and exhaust ports are provided at the tops of the first rectification column and the second rectification column.

[0008] Preferably, discharge ports are provided at the bottoms of the first rectification column and the second rectification column. Feed ports are installed on the other side end faces of the first rectification column and the second rectification column. Reflux ports are installed on one side end faces at the tops of the first rectification column and the second rectification column.

[0009] Preferably, trays are installed inside the first rectification column and the second rectification column. A plurality of through holes are provided on the surface of the trays. Overflow plates are provided on both sides of the upper surface of the trays. A downcomer is provided on one side of the overflow plate. The trays are arranged in a reverse manner.

[0010] Preferably, a spray rack is provided at the top inside the first rectification column and the second rectification column. A rotating seat is installed at the bottom of the spray rack. A spray head is installed at the bottom of the rotating seat. The spray head is rotatably connected to the spray rack through the rotating seat.

[0011] Compared with the prior art, the beneficial effects of the present utility model are:

[0012] 1. The utility model uses the first valve group and the second valve group as flow control components, the third valve group as a pressure control component, the first rectification tower, the second rectification tower, the first heat exchanger and the second heat exchanger as heat energy recovery components, the first reflux drum and the second reflux drum as reflux components. The gas-phase pipeline at the top of the first rectification tower is the same as the pipeline of the second rectification tower. A reboiler is added between this pipeline and the second rectification tower for heat exchange. The latent heat of the steam transported from the top of the first rectification tower is transported to the second rectification tower through the reboiler to heat the bottom material of the second rectification tower. After the reflux drum realizes the high-level heat energy utilization, the medium is re-transported back to the original system without affecting the operation of the original process. The heat energy recovery components are connected to the first rectification tower, and the pressures of the two systems are controlled by the pressure control component. The process controllability is high, the operation is simple, and the integrity of the original process operating system can be ensured. The weapon can be cut out at any time without affecting the process operation, reducing the consumption of the refrigerant water in the device and the operation cost of the refrigerant water system, solving the problems in the prior art that the rectification tower operation process is single and independent, does not affect each other, there is no cascade utilization of energy, and usually each tower needs an independent heat source for energy supply, resulting in a large overall energy demand and high energy consumption.

[0013] 2. By arranging a plurality of trays inside the rectification tower to form a tray-type rectification tower, which is composed of several layers of trays horizontally arranged at a certain interval along the tower height. This makes the tray-type rectification tower relatively simple in operation and maintenance, and is also convenient for the installation and disassembly of equipment, can adapt to different operating conditions, and handle various complex gas-liquid mixtures, thus providing a greater operating flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the first rectification tower of the present utility model;

[0015] Figure 2 It is an enlarged schematic diagram of the internal pedal structure of the rectification tower of the present utility model;

[0016] Figure 3 It is an enlarged schematic diagram of the partial structure of the spray rack of the present utility model;

[0017] Figure 4 It is a schematic diagram of the heat circulation process of the rectification tower of the present utility model;

[0018] In the figure: 1. First rectification tower; 2. Support feet; 3. Observation port; 4. Inlet; 5. Exhaust port; 6. Feed inlet; 7. Discharge port; 8. Return port; 9. Tray; 10. Overflow plate; 11. Downcomer; 12. Through hole; 13. Spraying rack; 14. Rotating seat; 15. Spraying head; 16. Second rectification tower; 17. First valve group; 18. Second valve group; 19. Third valve group; 20. First heat exchanger; 21. Second heat exchanger; 22. First reflux drum; 23. Second reflux drum; 24. First canned motor pump; 25. Second canned motor pump. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] Please refer to Figures 1-4, an embodiment provided by the present utility model: a rectifying column capable of recycling heat energy, including a first rectifying column 1 and a second rectifying column 16. Support feet 2 are installed at the bottoms of the first rectifying column 1 and the second rectifying column 16. Observation ports 3 are provided on the front end faces of the first rectifying column 1 and the second rectifying column 16. The first rectifying column 1 is connected to a first valve group 17, a first heat exchanger 20, and a first reflux tank 22 through pipelines. The first reflux tank 22 is connected to a first canned motor pump 24 through a pipeline. The first heat exchanger 20 is connected to a second valve group 18, a third valve group 19, and a second reflux tank 23 through pipelines. The second valve group 18 is connected to a second canned motor pump 25 through a pipeline. The third valve group 19 is connected to a second heat exchanger 21 and the second rectifying column 16 through pipelines. By using the first valve group 17 and the second valve group 18 as flow control components, the third valve group 19 as a pressure control component, the first rectifying column 1, the second rectifying column 16, the first heat exchanger 20, and the second heat exchanger 21 as heat energy recovery components, the first reflux tank 22 and the second reflux tank 23 as reflux components, the gas-phase pipeline at the top of the first rectifying column 1 is the same as the pipeline of the second rectifying column 16. A reboiler is added between this pipeline and the second rectifying column 16 for heat exchange. The latent heat of the steam transported from the top of the first rectifying column 1 is transported to the second rectifying column 16 through the reboiler to heat the bottom material of the second rectifying column 16. After the reflux tank realizes the high-level heat energy utilization, the medium is re-transported back to the original system without affecting the operation of the original process. The heat energy recovery component is connected to the first rectifying column 1. The pressures of the two systems are controlled by the pressure control component. The process controllability is high, the operation is simple, and the integrity of the original process operating system can be ensured. The weapon can be cut out at any time without affecting the process operation, reducing the consumption of the refrigerant water in the device and the operation cost of the refrigerant water system, and solving the problems in the prior art that the rectifying column operation process is single and independent, does not affect each other, there is no cascade utilization of energy, and often each tower needs an independent heat source for energy supply, resulting in a large overall energy demand and high energy consumption.

[0021] Please refer to Figures 1-4 , air inlets 4 are provided on one side of the end faces at the bottoms of the first rectifying column 1 and the second rectifying column 16. Exhaust ports 5 are provided at the tops of the first rectifying column 1 and the second rectifying column 16.

[0022] Please refer to Figures 1-4 , discharge ports 7 are provided at the bottoms of the first rectifying column 1 and the second rectifying column 16. Feed ports 6 are installed on the other side end faces of the first rectifying column 1 and the second rectifying column 16. Reflux ports 8 are installed on one side end faces at the tops of the first rectifying column 1 and the second rectifying column 16.

[0023] Please refer to Figures 1-4, trays 9 are installed inside both the first rectification column 1 and the second rectification column 16. A number of through holes 12 are provided on the surface of the tray 9. Overflow plates 10 are provided on both sides of the upper surface of the tray 9. A downcomer 11 is provided on one side of the overflow plate 10. The trays 9 are arranged in a reverse manner.

[0024] Please refer to Figures 1-4 , a spray rack 13 is provided at the top inside the first rectification column 1 and the second rectification column 16. A rotating seat 14 is installed at the bottom of the spray rack 13. A spray head 15 is installed at the bottom of the rotating seat 14. The spray head 15 is rotatably connected to the spray rack 13 through the rotating seat 14.

[0025] Working principle: During use, the medium is rectified in the first rectification column 1. A part of the gas phase undergoes heat exchange and condensation in the heat exchanger and then is sent to the reflux drum. In the reflux drum, part of it is refluxed to the rectification column through the regulating valve group by the pump, and part is sent to other processes. Another part of the gas phase at the top of the first rectification column 1 passes through the regulating valve group through the new pipeline and is sent to the second rectification column 16 through the heat exchanger to heat the medium in the reboiler. The medium in the second rectification column 16 is condensed by the heat exchanger and then sent to the reflux drum. The medium in the reflux drum is sent to the reflux drum of the first rectification column 1 through the canned motor pump. The reflux medium continues to be recycled according to the above steps to achieve the purpose of energy conservation, consumption reduction, cost reduction, and efficiency improvement. By using the first valve group 17 and the second valve group 18 as flow control components, the third valve group 19 as a pressure control component, the first rectification column 1, the second rectification column 16, the first heat exchanger 20, and the second heat exchanger 21 as heat energy recovery components, the first reflux drum 22 and the second reflux drum 23 as reflux components, the gas phase pipeline at the top of the first rectification column 1 is the same as the pipeline of the second rectification column 16. A reboiler is added between this pipeline and the second rectification column 16 for heat exchange. The latent heat of the steam transported from the top of the first rectification column 1 is transported to the second rectification column 16 through the reboiler to heat the material in the reboiler of the second rectification column 16. After the reflux drum realizes the utilization of high-level heat energy, the medium is re-transported back to the original system without affecting the operation of the original process. The heat energy recovery component is connected to the first rectification column 1. The pressures of the two systems are controlled by the pressure control component. The process controllability is high, the operation is simple, and the integrity of the original process operating system can be ensured. The weapon can be cut out at any time without affecting the process operation, reducing the consumption of the refrigerant water in the device and the operation cost of the refrigerant water system, solving the problems in the prior art that the rectification column operation process is single and independent, does not affect each other, and there is no cascaded utilization of energy. Often, each tower requires an independent heat source for energy supply, resulting in a large overall energy demand and high energy consumption.

[0026] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A distillation tower capable of recycling heat energy, comprising a first distillation tower (1) and a second distillation tower (16), characterized in that: The bottoms of the first distillation tower (1) and the second distillation tower (16) are both provided with supporting legs (2); the front ends of the first distillation tower (1) and the second distillation tower (16) are provided with observation ports (3); the first distillation tower (1) is connected to the first valve group (17), the first heat exchanger (20) and the first reflux tank (22) through pipelines; the first reflux tank (22) is connected to the first shielded pump (24) through pipelines; the first heat exchanger (20) is connected to the second valve group (18), the third valve group (19) and the second reflux tank (23) through pipelines; the second valve group (18) is connected to the second shielded pump (25) through pipelines; and the third valve group (19) is connected to the second heat exchanger (21) and the second distillation tower (16) through pipelines.

2. A distillation tower capable of recycling heat energy according to claim 1, characterized in that: An air inlet (4) is provided on one side of the bottom of each of the first distillation tower (1) and the second distillation tower (16), and an exhaust port (5) is provided on the top of each of the first distillation tower (1) and the second distillation tower (16).

3. A distillation tower capable of recycling heat energy according to claim 1, characterized in that: The bottom of the first distillation tower (1) and the second distillation tower (16) are both provided with a discharge port (7), the other end faces of the first distillation tower (1) and the second distillation tower (16) are both provided with a feed port (6), and the top end faces of the first distillation tower (1) and the second distillation tower (16) are both provided with a reflux port (8).

4. A distillation tower capable of recycling heat energy according to claim 1, characterized in that: The first distillation tower (1) and the second distillation tower (16) are both provided with a tower plate (9) inside, and a plurality of through holes (12) are provided on the surface of the tower plate (9).

5. A distillation tower capable of recycling heat energy according to claim 4, characterized in that: Overflow plates (10) are arranged on both sides of the upper surface of the tower plate (9), a downcomer (11) is arranged on one side of the overflow plate (10), and the tower plates (9) are arranged in reverse directions.

6. A distillation tower capable of recycling heat energy according to claim 1, characterized in that: A spray rack (13) is arranged at the top of the first distillation tower (1) and the second distillation tower (16), and a rotating seat (14) is installed at the bottom of the spray rack (13).

7. A distillation tower capable of recycling heat energy according to claim 6, characterized in that: A spray head (15) is installed at the bottom of the rotating seat (14), and the spray head (15) is rotatably connected to the spray frame (13) through the rotating seat (14).

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