Buffer assembly for reduced pressure stripping tower liquid level meter
By installing a buffer assembly in the level meter of the decompression stripping tower, the pressure difference between the tower top and the level meter is used to solve the false indication and equipment damage caused by the oil and gas mixture and negative pressure environment, and the accuracy and stability of the level meter are achieved.
Patent Information
- Application Number
- CN202421513847.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the decompression stripping tower, the level meter has rapid fluctuations in the float due to the interaction between the oil and gas mixture and the negative pressure environment, causing the level meter to be falsely indicated and equipment damage.
A buffer assembly is designed. By installing a buffer assembly between the float level meter and the decompression stripping tower, the pressure difference between the tower top and the level meter is used to prevent light components and gas from entering the inside of the level meter, thereby eliminating the impact of bubble enlargement and rupture on the float.
It effectively avoids false indications of the level gauge and fundamentally prevents equipment damage, ensuring the accuracy and stability of the level gauge.
Smart Images
Figure CN222652332U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of liquid level measurement, in particular to a buffer component for a vacuum stripping tower liquid level gauge. Background Art
[0002] 1. Float level gauge
[0003] The principle of the float level gauge is to use the float immersed in the liquid. The buoyancy of the float varies according to the degree of immersion. As long as the change of the buoyancy of the float is detected, the liquid level can be known. The magnitude of the buoyancy of the float is based on the Archimedes principle that an object immersed in a liquid is subject to an upward buoyancy, and the magnitude of the buoyancy is equal to the weight of the liquid displaced by the object. The stability of the float is the key to liquid level measurement.
[0004] (1) Remote float level gauge:
[0005] Its structure consists of a measuring part and a conversion part. The measuring part consists of a float and a hanging chain. The specific structure is as follows: Figure 1 , Figure 2 As shown: The float is generally a hollow long cylinder made of stainless steel, suspended vertically in the measured medium. Its mass is greater than the weight of the liquid of the same volume, and its center of gravity is lower than the geometric center, so that the float always remains upright and is not affected by the height of the liquid.
[0006] It has very little displacement during the measurement process and will not float on the liquid surface. The float is suspended at one end of the lever, and the other end of the lever is vertically connected to one end of the torque tube core shaft. The other end of the torque tube is fixed to the instrument housing. The torque tube is a sealed output shaft. On the one hand, it can separate the measured medium from the external space; on the other hand, it can use the elastic torsional deformation of the torque tube to convert the torque acting on one end of the torque tube into the angular displacement (rotation) of the core shaft.
[0007] When the liquid level is at zero, the torque tube is affected by the torque generated by the mass of the float (the torque is the largest at this time). When the liquid level rises, the buoyancy of the liquid increases on the float, and the torque generated on the torque tube through the lever decreases, and the deformation of the torque tube decreases. When the liquid level is the highest, the torsion angle is the smallest. Through the lever, the float rises slightly, the buoyancy decreases, and finally the torque balance is achieved. The change in the torsion angle of the torque tube (that is, the change in the angular displacement of the core shaft) is proportional to the liquid level, that is, the higher the liquid level, the smaller the torsion angle. The transmitter converts this angle into a 4-20mA DC signal, which is proportional to the measured liquid level.
[0008] (2) Magnetic flap level gauge
[0009] The liquid level gauge works based on the principles of buoyancy and magnetic coupling. When the liquid level in the measured container rises or falls, the float in the main pipe of the liquid level gauge also rises or falls. The permanent magnet in the float is transmitted to the on-site indicator through magnetic coupling, driving the red and white flip columns to flip 180°. When the liquid level rises, the flip column turns from white to red, and when the liquid level drops, the flip column turns from red to white. The red and white boundary positions of the indicator are the actual height of the medium level in the container, thereby realizing the indication of the liquid level.
[0010] 2. Disadvantages
[0011] According to the working principle of the float level gauge, it is not difficult to see that the precision of the entire measuring component of the remote transmission float level gauge is extremely high, and the angle change is also very subtle. Although the displacement of the float during the measurement process is extremely small, and the displacement of the torque tube and the core shaft is extremely small; but when the working conditions of the measured equipment have large fluctuations, or the working conditions are extremely unstable, the instantaneous speed and acceleration of the float are infinitely magnified, and the rapid up and down impact of the float not only damages the float, but also inevitably causes damage to the entire measuring component. In the least, the float is unhooked, in the worst case, the torque tube and the core shaft fail, the float is damaged, and in the worst case, the measuring component is broken, the sensor is damaged, and the float is damaged.
[0012] 3. Cause Analysis
[0013] In practice, when the level gauge fluctuates and changes suddenly, the actual liquid level of the stripping tower does not fluctuate, but the float inside the level gauge does fluctuate up and down, thus presenting the illusion of level fluctuation. The fluctuation of the float is caused by the interaction between the oil-gas mixture and the negative pressure environment. That is, the gas enters from the bottom of the magnetic flap level gauge, driving the float to rise. At the same time, the bubbles gradually grow larger during the rising process, and the float also rises further as the bubbles grow. The speed of the float rises depends on the speed of the bubble rising and growing. When the bubble grows to a certain extent and finally bursts, the float falls rapidly at the moment the bubble bursts. This repeats, creating the illusion of fluctuation of the level gauge. Such sudden increases and decreases for a long time will eventually damage the internal mechanism of the level gauge.
[0014] Through the above analysis, it is not difficult to conclude that the key to solving the problem lies in the bubbles entering the liquid level meter from the stripping tower, how to prevent the bubbles from entering the liquid level meter, and how to prevent the bubbles from amplifying and pushing the liquid level meter to mutate.
[0015] The existing technical means is to increase the pipe diameter of the float level gauge by calculation, and then increase the mass of the float to achieve the purpose of increasing the inertia of the float. However, practice has proved that this method can only alleviate it to a certain extent and cannot completely eliminate it. Utility Model Content
[0016] The utility model overcomes the shortcomings of the prior art and proposes a buffer assembly for a vacuum stripping tower liquid level gauge, thereby solving the problem that a liquid level gauge installed on a vacuum stripping tower may have false indications or even be damaged due to fluctuations in the tower.
[0017] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.
[0018] A buffer assembly for a vacuum stripping tower liquid level gauge, wherein the upper and lower liquid inlets of the float liquid level gauge are connected to the vacuum stripping tower through the buffer assembly; the buffer assembly comprises a shell, a buffer cavity is arranged in the shell, a stripping tower connection port is arranged at one end of the buffer cavity, and a liquid level gauge connection port is arranged at the other end; a pressure balance interface is also arranged on the buffer cavity between the stripping tower connection port and the liquid level gauge connection port; the stripping tower connection port is connected to the bottom of the vacuum stripping tower through a first pipeline, and the liquid level gauge connection port is connected to the liquid inlet of the liquid level gauge through a second pipeline; the pressure balance interface is connected to the reserved hole at the top of the vacuum stripping tower through a third pipeline.
[0019] Furthermore, control valves are provided on the first pipeline and the third pipeline.
[0020] Furthermore, one end of the control valve on the first pipeline is connected to the first pipeline through a flange, and the other end is connected to the stripping tower connecting port through a flange.
[0021] Furthermore, the connecting port of the liquid level gauge is connected to one end of the second pipeline through a flange, and the other end of the second pipeline is connected to the liquid inlet of the float liquid level gauge.
[0022] Furthermore, the float level gauge is a remote transmission float level gauge or a magnetic flap level gauge.
[0023] The beneficial effects of the utility model compared with the prior art are:
[0024] The utility model adds a pressure reducing stripping tower level gauge buffer component in the middle of the connection between the existing float level gauge and the tower, and utilizes the pressure difference between the top of the stripping tower and the level gauge. When the light components and oil and gas enter the lower part of the level gauge through the lower connecting pipe of the level gauge, under the pressure difference with the tower top, the light components and gas return to the tower top and no longer enter the inside of the level gauge; and the return tower line at the top of the level gauge returns to the top of the stripping tower, ensuring the original pressure balance of the level gauge. By installing the stripping tower level gauge buffer component, it is ensured that the light components and gas inside the tower return to the top of the tower, thereby eliminating the phenomenon of the float rising and falling caused by the increase and rupture of bubbles generated by the oil and gas mixture, effectively avoiding false indications of the level gauge, and fundamentally avoiding equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1It is a structural schematic diagram of the connection between the vacuum stripping tower and the remote buoy liquid level gauge in the prior art.
[0026] Figure 2 It is a structural schematic diagram of a buffer assembly connected between a vacuum stripping tower and a remote buoy liquid level gauge in the utility model.
[0027] Figure 3 for Figure 2 A partial enlarged view of the buffer component.
[0028] Figure 4 It is a cross-sectional view of the buffer assembly of the utility model.
[0029] In the figure: 1-buoy level gauge, 2-pressure reducing stripping tower, 3-buffer assembly, 4-first pipeline, 5-second pipeline, 6-third pipeline, 7-tower top reserved hole, 8-control valve, 9-flange, 301-shell, 302-buffer chamber, 303-stripping tower connection port, 304-level gauge connection port, 305-pressure balance interface. DETAILED DESCRIPTION
[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.
[0031] See also Figure 2 , this embodiment proposes a buffer assembly for a vacuum stripping tower level gauge, wherein the upper and lower liquid inlets of the float level gauge 1 are connected to the vacuum stripping tower 2 through the buffer assembly 3;
[0032] See also Figure 3 and Figure 4 The buffer component 3 includes a shell 301, a buffer chamber 302 is arranged in the shell 301, a stripping tower connection port 303 is arranged at one end of the buffer chamber 302, and a liquid level gauge connection port 304 is arranged at the other end; a pressure balance interface 305 is also arranged on the buffer chamber 302 between the stripping tower connection port 303 and the liquid level gauge connection port 304; the stripping tower connection port 303, the liquid level gauge connection port 304, and the pressure balance interface 305 are all connected to the buffer chamber 302 to form a structure similar to a tee.
[0033] Among them, the stripping tower connection port 303 is connected to the bottom of the vacuum stripping tower 2 through the first pipeline 4, the liquid level gauge connection port 304 is connected to the liquid inlet of the float liquid level gauge 1 through the second pipeline 5; the pressure balance interface 305 is connected to the reserved hole 7 at the top of the vacuum stripping tower 2 through the third pipeline 6.
[0034] Specifically, the first pipeline 4 and the third pipeline 6 are both provided with control valves 8 to facilitate control of the liquid entering and exiting the buffer assembly 3 .
[0035] One end of the control valve 8 on the first pipeline 4 is connected to the first pipeline 4 through a flange 9, and the other end is connected to the stripping tower connection port 303 through a flange 9. The level gauge connection port 304 is connected to one end of the second pipeline 5 through a flange 9, and the other end of the second pipeline 5 is connected to the liquid inlet of the float level gauge 1.
[0036] This embodiment Figure 3 The float level gauge 1 is a remote float level gauge. Of course, it can be understood that the buffer component 3 is also applicable to a magnetic flap level gauge.
[0037] The working principle of the buffer assembly 3 described in this embodiment is:
[0038] Both the upper and lower buffer components 3 are provided with a pressure balance interface 305 in the middle section upward, which is connected to the reserved hole 7 at the top of the vacuum stripping tower 2 through the control valve 8 and the third pipeline 6 thereon, and the pressure difference between the top of the vacuum stripping tower 2 and the float level gauge 1 is utilized (the negative pressure in the tower is the highest at the top of the tower, the upper part of the level gauge is in the middle, and the lower part of the level gauge is the lowest, and the negative pressure at the top of the tower is much higher than the connection between the upper and lower parts of the level gauge). Before the light components and oil and gas enter the lower part of the level gauge through the lower connecting pipe of the float level gauge 1, under the pressure difference with the top of the tower, the light components and gas return to the top of the tower through the pressure balance interface 305 and the third pipeline 6, and no longer enter the inside of the level gauge; and the upper part of the float level gauge 1 is also connected to the buffer component 3, and the gas phase components in the float level gauge 1 return to the top of the stripping tower through the third pipeline 6 connected to the upper buffer component 3, thereby ensuring the original pressure balance in the float level gauge 1.
[0039] By installing a stripping tower level gauge buffer assembly, the light components and gases inside the tower are guaranteed to return to the top of the tower, thereby eliminating the sudden rise and fall of the float caused by the growth and rupture of bubbles generated by the oil and gas mixture, effectively avoiding false indications of the level gauge and fundamentally avoiding equipment damage.
[0040] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.
Claims
1. A buffer assembly for a vacuum stripping tower liquid level gauge, characterized in that: The upper and lower liquid inlets of the float level gauge (1) are connected to the vacuum stripping tower (2) through a buffer assembly (3); the buffer assembly (3) comprises a shell (301), a buffer chamber (302) is arranged in the shell (301), one end of the buffer chamber (302) is provided with a stripping tower connection port (303), and the other end is provided with a liquid level gauge connection port (304); a pressure balance interface (305) is also arranged on the buffer chamber (302) between the stripping tower connection port (303) and the liquid level gauge connection port (304); the stripping tower connection port (303) is connected to the bottom of the vacuum stripping tower (2) through a first pipeline (4), and the liquid level gauge connection port (304) is connected to the liquid inlet of the float level gauge (1) through a second pipeline (5); the pressure balance interface (305) is connected to a reserved hole (7) at the top of the vacuum stripping tower (2) through a third pipeline (6).
2. A buffer assembly for a vacuum stripping tower liquid level gauge according to claim 1, characterized in that: The first pipeline (4) and the third pipeline (6) are both provided with control valves (8).
3. A buffer assembly for a vacuum stripping tower level gauge according to claim 2, characterized in that: One end of the control valve (8) on the first pipeline (4) is connected to the first pipeline (4) via a flange (9), and the other end is connected to the stripping tower connection port (303) via a flange (9).
4. A buffer assembly for a vacuum stripping tower liquid level gauge according to claim 1, characterized in that: The liquid level gauge connection port (304) is connected to one end of the second pipeline (5) via a flange (9), and the other end of the second pipeline (5) is connected to the liquid inlet of the float liquid level gauge (1).
5. The buffer assembly for a vacuum stripping tower level gauge according to claim 1, characterized in that: The float level gauge (1) is a remote transmission float level gauge or a magnetic flap level gauge.