Vacuum unit capable of effectively collecting low-boiling-point components
By introducing a condensation buffer tank and a collection tank into the vacuum unit, the low boiling point components are collected using the frozen water condensation baffle plate, the problem of contamination of low boiling point components in vacuum fractionation is solved, and the effective recycling of components and environmental protection is achieved.
Patent Information
- Application Number
- CN202420623920.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-03-28
AI Technical Summary
During vacuum fractionation, low boiling point components are difficult to collect effectively, causing them to enter the vacuum pump to affect performance and pollute the environment, and even cause cavitation of the water ring pump.
A vacuum unit including a condensation buffer tank and a collection tank is designed. The gas-liquid separation efficiency is improved by using a frozen water condensation baffle through the condensation buffer tank, and the low boiling point components are collected into the collection tank, and controlled in a vacuum state through a valve. Exhaust to avoid pollution.
Effectively collect and utilize low boiling point components to prevent them from entering the vacuum pump, reduce environmental pollution, protect the water ring pump, and minimize the impact on production.
Smart Images
Figure CN222324267U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of low boiling point component collection, in particular to a vacuum unit for effectively collecting low boiling point components. Background Art
[0002] In the process of vacuum fractionation, in order to maintain the system vacuum, a vacuum unit must be configured. In order to achieve a high vacuum effect, it is usually necessary to connect multiple vacuum pumps in series to form a vacuum unit. The commonly used vacuum unit structure design is composed of a front pump and a two-stage Roots vacuum pump connected in series end to end. The gases usually sucked from the fractionation system into the vacuum pipeline system are non-condensable gases and condensable gases. Condensable gases have a low boiling point and are called low-boiling liquids after condensation. The traditional vacuum system configuration method is to configure a vacuum buffer tank on the pipeline between the fractionation system and the vacuum unit to separate the gas and liquid by reducing the gas velocity in the buffer tank. The condensable gas may be converted into a low-boiling liquid, which is retained in the vacuum buffer tank and discharged when the system is shut down.
[0003] However, the effect of this configuration is not ideal. Most of the condensable gases will still be sucked into the vacuum pumps of each stage of the vacuum unit, which will affect the performance of the vacuum pump on the one hand, and on the other hand, they may be discharged into the atmosphere after entering the front stage pump to pollute the environment, or enter the water ring vacuum pump that uses water as the working medium, affecting the recycling of water. In severe cases, it will cause cavitation in the water ring pump, and a large number of honeycomb-shaped corroded surfaces will appear on the pump blades, and the pump cannot work normally. Utility Model Content
[0004] The utility model provides a vacuum unit for effectively collecting low-boiling point components, which solves the existing problems.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A vacuum unit for effectively collecting low-boiling point components comprises a condensation buffer tank, a base, a vacuum main pipe and a butt joint pipe, wherein a baffle is arranged inside the condensation buffer tank, a mounting frame is arranged on the base, a first-stage Roots vacuum pump is arranged on the mounting frame, a second-stage Roots vacuum pump is arranged below the first-stage Roots vacuum pump, the first-stage Roots vacuum pump and the second-stage Roots vacuum pump are connected in series, the vacuum main pipe is connected to the first-stage Roots vacuum pump, a connecting pipe is arranged on one side of the condensation buffer tank, an outlet of the second-stage Roots vacuum pump is connected to the connecting pipe, a front-stage pump is arranged on one side of the base, a butt joint pipe is arranged between the condensation buffer tank and the front-stage pump, the condensation buffer tank and the front-stage pump are connected through the butt joint pipe, a collecting tank is arranged at the bottom of the condensation buffer tank, and a drain pipe is arranged on one side of the collecting tank.
[0007] As a further solution of the utility model, a chilled water outlet pipe and a chilled water inlet pipe are provided on one side of the condensation buffer tank.
[0008] As a further solution of the utility model, a mounting ring and a mounting frame are provided on the base, the condensation buffer tank is provided on the mounting ring, and the collection tank is provided on the mounting frame.
[0009] As a further solution of the utility model, a first valve and a one-way valve are provided on the butt joint.
[0010] As a further solution of the utility model, a discharge pipe is provided at the bottom of the condensation buffer tank, the discharge pipe is connected to one side of the collection tank, and a second valve is provided on the discharge pipe.
[0011] As a further solution of the utility model, a drain valve is provided on one side of the collection tank, and a drain valve is provided on the drain pipe.
[0012] The beneficial effects of the utility model are:
[0013] 1. The correlation between boiling point and pressure can be fully utilized. In actual operation, by adding a condensation buffer tank and a collection tank between the first-stage Roots vacuum pump and the fore-stage pump, the low-boiling point components in the vacuum pipeline can be effectively recovered and utilized, avoiding the low-boiling point components from entering the fore-stage pump to contaminate the working fluid or being discharged into the atmosphere.
[0014] 2. The condensate buffer tank and the collection tank are connected by a valve, and the condensate can be discharged into the collection tank in time. When the liquid in the collection tank is collected to a certain extent, the second valve can be closed, and the discharge can be realized under the operation state of the vacuum unit through the configured vent valve and drain valve. The whole process has no effect on the system vacuum, which can minimize the impact on production. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the main structure of the utility model.
[0016] Figure 2 This is a schematic diagram of the structure of the condensation buffer tank of the utility model.
[0017] Figure 3 This is a schematic diagram of the structure of the collection tank of the utility model.
[0018] Numbers in the figure: 1. Condensation buffer tank; 11. Connecting pipe; 12. Baffle; 13. Chilled water outlet pipe; 14. Chilled water inlet pipe; 15. Discharge pipe; 2. Base; 21. Mounting ring; 22. Mounting frame; 23. Mounting frame; 3. Vacuum main pipe; 31. First-stage Roots vacuum pump; 32. Second-stage Roots vacuum pump; 4. Butt pipe; 41. First valve; 42. Check valve; 43. Fore-stage pump; 5. Collecting tank; 51. Second valve; 52. Vent valve; 53. Drain valve; 54. Drain pipe. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0020] Reference Figure 1-Figure 3 , a vacuum unit for effectively collecting low-boiling-point components, comprising a condensation buffer tank 1, a base 2, and a vacuum main pipe 3. A condenser is arranged in the condensation buffer tank 1, and the condensation area is 1-5 square meters, so that the condensable gas entering the condensation buffer tank 1 is separated into gas and liquid in the condensation buffer tank 1 and is mainly condensed into liquid on the condensation surface. The base 2 is the installation structure of the entire unit, and a mounting ring 21 and a mounting frame 23 are arranged on the base 2. The condensation buffer tank 1 is arranged on the mounting ring 21. The vacuum main pipe 3 is the main pipe of the fractionation system. One side of the condensation buffer tank 1 A chilled water outlet pipe 13 and a chilled water inlet pipe 14 are provided, that is, the chilled water can be discharged through the chilled water outlet pipe 13, and chilled water (-15°C ~ 10°C) is introduced into the condensation buffer tank 1 through the chilled water inlet pipe 14, and a baffle 12 is provided in the tank body. The heat exchange efficiency is improved through the air flow channel in the tank body through the baffle 12, and the low-boiling point substance is effectively condensed and recovered and will not enter the front stage pump 43. The principle is to use the correlation between the condensation point of the substance and the pressure. The greater the pressure, the lower the condensation point, and the gas components are easier to condense.
[0021] A mounting frame 22 is provided on the base 2, a first-stage Roots vacuum pump 31 is provided on the mounting frame 22, a second-stage Roots vacuum pump 32 is provided below the first-stage Roots vacuum pump 31, the mounting frame 22 is used to install the first-stage Roots vacuum pump 31 and the second-stage Roots vacuum pump 32, the first-stage Roots vacuum pump 31 and the second-stage Roots vacuum pump 32 are connected in series, the vacuum main pipe 3 is connected to the first-stage Roots vacuum pump 31, a connecting pipe 11 is provided on one side of the condensation buffer tank 1, and an outlet of the second-stage Roots vacuum pump 32 is connected to the connecting pipe 11. After the gas comes out of the fractionation system and passes through the second-stage Roots vacuum pump 32 and the first-stage Roots vacuum pump 31, the pressure of the gas entering the condensation buffer tank 1 is higher than the pressure before the second-stage Roots vacuum pump 32, so that the condensation point of the condensable gas is significantly increased, and the low-boiling-point substance originally in the gas state is quickly condensed into liquid.
[0022] A front pump 43 is arranged on one side of the base 2, a docking pipe 4 is arranged between the condensation buffer tank 1 and the front pump 43, the condensation buffer tank 1 and the front pump 43 are connected through the docking pipe 4, a first valve 41 and a one-way valve 42 are arranged on the docking pipe 4, that is, the gas enters the front pump 43 by opening the first valve 41, and the backflow is avoided by the design of the one-way valve 42, a collecting tank 5 is arranged at the bottom of the condensation buffer tank 1, a drain pipe 54 is arranged on one side of the collecting tank 5, the collecting tank 5 is arranged on the installation frame 23, and a discharge pipe 15 is arranged at the bottom of the condensation buffer tank 1 to discharge The pipe 15 is connected to one side of the collecting tank 5, and a second valve 51 is arranged on the discharge pipe 15, that is, the discharge pipe 15 is opened and closed by the second valve 51, and the condensate is collected by the collecting tank 5. A vent valve 52 is arranged on one side of the collecting tank 5, and a drain valve 53 is arranged on the drain pipe 54. When the liquid in the collecting tank is collected to a certain extent, the second valve 51 can be closed, and the discharge of the material can be realized under the operation state of the vacuum unit through the configured vent valve 52 and drain valve 53, and the whole process has no effect on the system vacuum, which can minimize the impact on production.
[0023] Working principle: the gas comes out from the vacuum main pipe 3 of the distillation system, passes through the first-stage Roots vacuum pump 31 and the second-stage Roots vacuum pump 32, and then enters the condensation buffer tank 1 at a higher pressure than the pressure before the second-stage vacuum pump, so that the condensation point of the condensable gas is significantly increased, and the low-boiling-point substances originally in the gas state are quickly condensed into liquid. At the same time, the air flow channel in the tank body is improved through the baffle 12 set to improve the heat exchange efficiency, and the low-boiling-point substances are effectively condensed and recovered, and will not enter the front-stage pump 43. The collecting tank 5 collects the liquid condensed in the condensation buffer tank 1. When a certain amount of liquid is collected, the second valve 51 can be closed, and the drain valve 52 and the drain valve 53 can be opened to release it from the drain pipe 54, so as to realize discharge under vacuum state. The whole process has no effect on the system vacuum, which can minimize the impact on production. The gas is allowed to enter the front-stage pump 43 by opening the first valve 41, and the backflow is avoided by the design of the one-way valve 42.
[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A vacuum unit for effectively collecting low-boiling-point components, comprising a condensation buffer tank (1), a base (2), and a vacuum main pipe (3), characterized in that: The condensation buffer tank (1) is provided with a baffle plate (12) inside, the base (2) is provided with a mounting frame (22), a first-stage Roots vacuum pump (31) is provided on the mounting frame (22), a second-stage Roots vacuum pump (32) is provided below the first-stage Roots vacuum pump (31), the first-stage Roots vacuum pump (31) and the second-stage Roots vacuum pump (32) are connected in series, the vacuum main pipe (3) is connected to the first-stage Roots vacuum pump (31), and the condensation buffer tank (1) A connecting pipe (11) is provided on one side, and the outlet of the secondary Roots vacuum pump (32) is connected to the connecting pipe (11); a front-stage pump (43) is provided on one side of the base (2); a docking pipe (4) is provided between the condensation buffer tank (1) and the front-stage pump (43); the condensation buffer tank (1) and the front-stage pump (43) are connected via the docking pipe (4); a collecting tank (5) is provided at the bottom of the condensation buffer tank (1), and a drain pipe (54) is provided on one side of the collecting tank (5).
2. A vacuum unit for effectively collecting low boiling point components according to claim 1, characterized in that: A chilled water outlet pipe (13) and a chilled water inlet pipe (14) are provided on one side of the condensation buffer tank (1).
3. A vacuum unit for effectively collecting low boiling point components according to claim 1, characterized in that: A mounting ring (21) and a mounting frame (23) are provided on the base (2); the condensation buffer tank (1) is provided on the mounting ring (21); and the collection tank (5) is provided on the mounting frame (23).
4. A vacuum unit for effectively collecting low boiling point components according to claim 1, characterized in that: The butt joint (4) is provided with a first valve (41) and a one-way valve (42).
5. A vacuum unit for effectively collecting low boiling point components according to claim 1, characterized in that: A discharge pipe (15) is provided at the bottom of the condensation buffer tank (1), the discharge pipe (15) is connected to one side of the collection tank (5), and a second valve (51) is provided on the discharge pipe (15).
6. A vacuum unit for effectively collecting low boiling point components according to claim 1, characterized in that: A drain valve (52) is provided on one side of the collection tank (5), and a drain valve (53) is provided on the drain pipe (54).