Rectifying tower top gas phase treatment system
By setting up a lower insertion line lower than the outlet port in the gas phase treatment system at the top of the distillation tower, the problem of liquid seal failure is solved, ensuring the safe operation of the negative pressure of the system, reducing safety risks and improving production efficiency.
Patent Information
- Application Number
- CN202422253022.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The liquid seal failure often occurs in the existing gas phase treatment systems on the top of the distillation tower, which may cause the system running in negative pressure to deflate or cause material leakage, and even cause safety accidents.
A gas phase treatment system on the top of the distillation tower is designed. By setting the bottom ports of the first and second lower insertion lines below the outlet ports of the return tank and the flushing tank, the liquid seal is ensured to be effective and the liquid seal failure is avoided.
It effectively avoids liquid seal failure, ensures the safe operation of negative pressure of the entire system, reduces safety risks, saves maintenance costs, and improves production efficiency.
Smart Images
Figure CN223026738U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of rectification, in particular to a gas-phase treatment system at the top of a rectification column. Background Technique
[0002] A rectification column is a tower-type gas-liquid contact device for rectification. It utilizes the property that each component in the raw material mixture has different volatilities, that is, the vapor pressures of each component are different at the same temperature. In this way, the light components in the liquid phase are transferred to the gas phase, and the heavy components in the gas phase are transferred to the liquid phase, so as to achieve the purpose of separation. The liquid phase after being treated by the rectification column is taken out from the bottom of the column, and the gas phase after being treated by the rectification column is taken out from the top of the column. The rectification system needs to operate under negative pressure conditions, which are achieved by pumping with a vacuum pump. At the same time, in the system for treating the gas phase at the top of the rectification column, the atmospheric storage tanks (such as reflux tanks and flushing liquid tanks) in the system need to insert pipelines below the liquid level to form a liquid seal to ensure the negative pressure conditions during the operation of the whole system. Generally, the bottom port of the traditional inserted pipeline is arranged higher than the liquid outlet pipe connected to the external pump. When the feed is accidentally closed by the operator while the extraction is maintained or when the liquid level gauge fails, the liquid level in the atmospheric storage tank is too low, resulting in the failure of the liquid seal. If the operator does not find the failure of the liquid seal and fails to handle it in time, the system operating under negative pressure will deflate the atmospheric storage tank. In severe cases, the material will leak, and the material exposed to the air will burn and explode, thus causing serious safety accidents. Summary of the Invention
[0003] In order to solve the problem of frequent liquid seal failure in the prior art, the utility model provides a new gas-phase treatment system at the top of a rectification column.
[0004] The utility model is realized by adopting the following technical scheme:
[0005] A gas-phase treatment system for the top of a distillation column, comprising a primary condensation cooler, a secondary condensation cooler, a reflux tank, an ejector, a vacuum buffer tank, a flushing liquid tank, and a tail gas purification tower; the heat exchange inlet of the primary condensation cooler is used to communicate with the gas-phase outlet at the top of the distillation column, the heat exchange outlet of the primary condensation cooler is communicated with the heat exchange inlet of the secondary condensation cooler, the refrigerant outlet of the secondary condensation cooler is communicated with the refrigerant inlet of the primary condensation cooler, the liquid-phase outlet of the secondary condensation cooler is communicated with the reflux tank through a first downcomer pipeline, the bottom port of the first downcomer pipeline is lower than the liquid outlet pipe of the reflux tank and the liquid outlet pipe of the reflux tank is communicated with the inlet of a first external pump, the outlet of the first external pump is led out through two reflux branch pipes, one reflux branch pipe is used to communicate with the circulating separation inlet of the distillation column, and the other reflux branch pipe is used to extract reflux liquid; the non-condensable gas outlet of the secondary condensation cooler is communicated with the gas inlet of the ejector, the gas-liquid outlet of the ejector is communicated with the inlet of the vacuum buffer tank, the gas outlet of the vacuum buffer tank is connected to the tail gas purification tower through a vacuum pump, the liquid-phase outlet of the vacuum buffer tank is communicated with the flushing liquid tank through a second downcomer pipeline, the bottom port of the second downcomer pipeline is lower than the liquid outlet pipe of the flushing liquid tank and the liquid outlet pipe of the flushing liquid tank is communicated with the inlet of a second external pump, the outlet of the second external pump is led out through two flushing branch pipes, one flushing branch pipe is communicated with the liquid inlet of the ejector, and the other flushing branch pipe is used to extract flushing liquid.
[0006] Working process: The gas phase at the top of the distillation column is cooled successively by the primary condensation cooler and the secondary condensation cooler. The liquid phase generated after the cooling treatment flows by gravity to the reflux tank. According to the liquid phase situation, it can be directly extracted or refluxed to the distillation column for re-separation. The non-condensable gas generated after the cooling treatment is further processed by the ejector. The gas-liquid mixture after being processed by the ejector is buffered by the vacuum buffer tank. The liquid phase after buffering flows by gravity to the flushing liquid tank, and the gas phase is sent to the tail gas purification tower for purification treatment and then discharged. The liquid phase flowing by gravity to the flushing liquid tank can be directly extracted or refluxed to the ejector for recycling according to the situation of the flushing liquid. Among them, setting the bottom port of the first downcomer pipeline lower than the liquid outlet pipe of the reflux tank and setting the bottom port of the second downcomer pipeline lower than the liquid outlet pipe of the flushing liquid tank can effectively avoid the failure of liquid seal.
[0007] The beneficial effects produced by the present utility model are as follows: The gas-phase treatment system for the top of the distillation column described in the present utility model can effectively avoid the failure of liquid seal, ensure the safe operation of the entire system under negative pressure, reduce safety risks, save maintenance costs, and improve production efficiency. Description of the Drawings
[0008] The drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments in line with the present utility model, and are used together with the specification to explain the principle of the present utility model.
[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0010] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0011] In the figure: 1 - rectification column, 2 - primary condensation cooler, 3 - secondary condensation cooler, 4 - reflux tank, 5 - ejector, 6 - vacuum buffer tank, 7 - flushing liquid tank, 8 - tail gas purification tower, 9 - vacuum pump, 10 - first external pump, 11 - second external pump, 12 - first down - insertion pipeline, 13 - second down - insertion pipeline. Specific embodiments
[0012] In order to more clearly understand the above - mentioned objects, features, and advantages of the present invention, the following will further describe the solutions of the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0013] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.
[0014] Many specific details are set forth in the following description in order to provide a thorough understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.
[0015] The following will detail the specific embodiments of the present invention with reference to the drawings.
[0016] As Figure 1As shown in the figure, a gas-phase treatment system for the top of a distillation column includes a primary condensation cooler 2, a secondary condensation cooler 3, a reflux tank 4, an ejector 5, a vacuum buffer tank 6, a flushing liquid tank 7, and a tail gas purification tower 8. The heat exchange inlet of the primary condensation cooler 2 is used to communicate with the gas-phase outlet at the top of the distillation column 1. The heat exchange outlet of the primary condensation cooler 2 is communicated with the heat exchange inlet of the secondary condensation cooler 3. The refrigerant outlet of the secondary condensation cooler 3 is communicated with the refrigerant inlet of the primary condensation cooler 2. The liquid-phase outlet of the secondary condensation cooler 3 is communicated with the reflux tank 4 through a first downcomer line 12. The bottom port of the first downcomer line 12 is lower than the liquid outlet pipe of the reflux tank 4, and the liquid outlet pipe of the reflux tank 4 is communicated with the inlet of a first external pump 10. The outlet of the first external pump 10 is led out through two reflux branch pipes. One reflux branch pipe is used to communicate with the circulating separation inlet of the distillation column 1, and the other reflux branch pipe is used to extract reflux liquid. The non-condensable gas outlet of the secondary condensation cooler 3 is communicated with the gas inlet of the ejector 5. The gas-liquid outlet of the ejector 5 is communicated with the inlet of the vacuum buffer tank 6. The gas outlet of the vacuum buffer tank 6 is connected to the tail gas purification tower 8 through a vacuum pump 9. The liquid-phase outlet of the vacuum buffer tank 6 is communicated with the flushing liquid tank 7 through a second downcomer line 13. The bottom port of the second downcomer line 13 is lower than the liquid outlet pipe of the flushing liquid tank 7, and the liquid outlet pipe of the flushing liquid tank 7 is communicated with the inlet of a second external pump 11. The outlet of the second external pump 11 is led out through two flushing branch pipes. One flushing branch pipe is communicated with the liquid inlet of the ejector 5, and the other flushing branch pipe is used to extract flushing liquid.
[0017] Working process: The gas phase at the top of the distillation column 1 is cooled successively by the primary condensation cooler 2 and the secondary condensation cooler 3. The liquid phase generated after the cooling treatment flows by gravity to the reflux tank 4. According to the liquid phase situation, it can be directly extracted or refluxed to the distillation column 1 for re-separation. The non-condensable gas generated after the cooling treatment is further processed by the ejector 5. The gas-liquid mixture after being processed by the ejector 5 is buffered by the vacuum buffer tank 6. The liquid phase after buffering flows by gravity to the flushing liquid tank 7, and the gas phase is sent to the tail gas purification tower 8 for purification treatment and then discharged. The liquid phase flowing by gravity to the flushing liquid tank 7 can be directly extracted or refluxed to the ejector 5 for recycling according to the flushing liquid situation. Among them, setting the bottom port of the first downcomer line 12 lower than the liquid outlet pipe of the reflux tank 4 and setting the bottom port of the second downcomer line 13 lower than the liquid outlet pipe of the flushing liquid tank 7 can effectively prevent the liquid seal from failing.
[0018] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Although the foregoing embodiments have been described in detail, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.
Claims
1. A distillation tower top gas phase processing system, characterized in that: The invention comprises a first-stage condenser cooler (2), a second-stage condenser cooler (3), a reflux tank (4), an ejector (5), a vacuum buffer tank (6), a flushing liquid tank (7), and an exhaust gas purification tower (8); the heat exchange inlet of the first-stage condenser cooler (2) is used to communicate with the gas phase outlet at the top of the distillation tower (1), the heat exchange outlet of the first-stage condenser cooler (2) is communicated with the heat exchange inlet of the second-stage condenser cooler (3), the refrigerant outlet of the second-stage condenser cooler (3) is communicated with the refrigerant inlet of the first-stage condenser cooler (2), the liquid phase outlet of the second-stage condenser cooler (3) is communicated with the reflux tank (4) through a first lower plug-in pipe line (12), the bottom port of the first lower plug-in pipe line (12) is lower than the liquid outlet pipe port of the reflux tank (4), and the liquid outlet pipe port of the reflux tank (4) is communicated with the inlet of a first external pump (10), and the outlet of the first external pump (10) is led out through two reflux branch pipes. One reflux branch pipe is used to communicate with the circulating separation inlet of the distillation tower (1), and the other reflux branch pipe is used to extract reflux liquid. The non-condensable gas outlet of the secondary condenser cooler (3) is connected to the gas inlet of the ejector (5), and the gas-liquid outlet of the ejector (5) is connected to the inlet of the vacuum buffer tank (6). The gas outlet of the vacuum buffer tank (6) is connected to the tail gas purification tower (8) through a vacuum pump (9). The liquid phase outlet of the vacuum buffer tank (6) is connected to the flushing liquid tank (7) through a second lower plug line (13). The bottom end of the second lower plug line (13) is lower than the liquid outlet of the flushing liquid tank (7) and the liquid outlet of the flushing liquid tank (7) is connected to the inlet of the second external pump (11). The outlet of the second external pump (11) is led out through two flushing branch pipes, one flushing branch pipe is connected to the liquid inlet of the ejector (5), and the other flushing branch pipe is used to extract flushing liquid.