CN113309891A

CN113309891A - Exhaust valve for pulse extraction column and pulse extraction device

Info

Publication number: CN113309891A
Application number: CN202110584391.6A
Authority: CN
Inventors: 于婷; 何辉; 叶国安; 刘栎锟; 李峰峰
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2021-08-27

Abstract

The application discloses discharge valve for pulse extraction post, it includes: the tube body (10) comprises an outlet and an inlet, the gas-liquid mixture in the pulse extraction column flows in from the inlet of the tube body (10) under the action of air pulse, and the gas in the gas-liquid mixture flows out from the outlet of the tube body (10); the floating plug (20) is positioned in the pipe body (10), and under the pressure action of the gas-liquid mixture, the floating plug (20) can move up and down along the axial direction of the pipe body (10); the first limiting structure (13) is formed on the pipe body (10) and is used for limiting the upward movement range of the floating plug (20); when the floating plug (20) moves upwards to be in contact with the first limiting structure (13), the liquid in the gas-liquid mixture entering the pipe body (10) is blocked from being sprayed out from the outlet, so that the liquid in the pulse extraction column can be prevented from being sprayed out, and the operation safety of the pulse extraction column is improved.

Description

Exhaust valve for pulse extraction column and pulse extraction device

Technical Field

The application relates to the technical field of nuclear industry post-processing equipment, in particular to an exhaust valve for a pulse extraction column and a pulse extraction device.

Background

In the post-treatment process of spent fuel in the nuclear industry, a pulse extraction column is a common extraction device and is commonly used for experimental researches such as extraction of radioactive feed liquid. When the pulse extraction column is used for experiments, two phases in the mixed liquid in the pulse extraction column move up and down periodically with certain amplitude and frequency under the action of air pulse, so that the countercurrent flow and the full mixing of the two phases are promoted, and the pulse extraction column has the characteristics of short total retention time, easy discharge of interface dirt, critical safety and the like.

However, in actual operation of the pulse extraction column, due to the excessive pulse intensity, especially in abnormal conditions, the liquid level in the column is periodically increased and is sprayed out from the exhaust port of the clarification section on the pulse extraction column, so that a periodic material spraying phenomenon is generated. In order to prevent radioactive contamination caused by the material spraying phenomenon, an exhaust port is usually connected to a water phase discharge pipe to prevent accidents such as radioactive material leakage caused by material spraying. However, when this method is adopted, the design of the pipeline externally connected with the discharge pipe is complicated, and the cost is high.

Disclosure of Invention

According to one aspect of the present application, there is provided a vent valve for a pulsed extraction column, comprising: the gas-liquid mixture in the pulse extraction column flows in from the inlet of the pipe body under the action of air pulse, and the gas in the gas-liquid mixture flows out from the outlet of the pipe body; the floating plug is positioned in the pipe body and can move up and down along the axial direction of the pipe body under the pressure action of the gas-liquid mixture; the first limiting structure is formed on the pipe body and used for limiting the upward movement range of the floating plug; when the floating plug moves upwards to be in contact with the first limiting structure, the liquid in the gas-liquid mixture entering the pipe body is blocked from being sprayed out of the outlet.

According to another aspect of the present application, there is provided a pulsed extraction device comprising: a pulsed extraction column, and an exhaust valve as described in the previous embodiments removably connected to an exhaust port of the pulsed extraction column to exhaust gas when a pulse of air is generated within the pulsed extraction column; the gas-liquid mixture in the pulse extraction column rises under the pressure of air pulse and enters the exhaust valve, the floating plug moves upwards under the pressure action of the gas-liquid mixture, and the floating plug is used for blocking liquid in the gas-liquid mixture from being sprayed out when the floating plug moves to be in contact with the first limiting structure.

Drawings

Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and may help to provide a thorough understanding of the present application.

FIG. 1 is a schematic view of a vent valve according to an embodiment of the present application;

FIG. 2 is a schematic view of the vent valve of FIG. 1 with the floating plug moving upward into contact with the first stop structure;

FIG. 3 is a schematic illustration of a cross-section of a vent valve over a second stop structure according to an embodiment of the present application;

FIG. 4 is a schematic illustration of a cross-section of a discharge valve over a second stop structure according to another embodiment of the present application;

fig. 5 is a schematic view of the discharge valve of fig. 1 connected to a pulse extraction column.

It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.

Description of reference numerals:

100. an exhaust valve; 10. a pipe body; 11. a connecting pipe; 12. an exhaust pipe; 13. a first limit structure; 14. a second limit structure; 15. a bending section; 20. a floating plug; 21. a hollow body; 22. a guide portion; 200. an exhaust port; 300. a connecting member.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described below in detail and completely with reference to the accompanying drawings of the embodiments of the present application. It should be apparent that the described embodiment is one embodiment of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

It is to be noted that, unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied. Furthermore, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures, and should be understood to encompass different orientations in use or operation in addition to the orientation depicted in the figures.

The exhaust valve in this application can be connected on the gas vent of pulse extraction post for gaseous the discharge that produces when the periodic air pulse with pulse extraction post, prevent simultaneously that the liquid in the pulse extraction post from spouting under the effect of air pulse. The pulse extraction column can be used for performing a hydraulics experiment and/or an extraction experiment research on radioactive liquid, can be a pulse extraction column with various scales, such as a laboratory scale or cold test scale pulse extraction column, performs the hydraulics experiment and/or the extraction experiment research through the laboratory scale pulse extraction column, and can provide necessary data and technical support for an industrial scale pulse extraction column. In addition, the pulsed extraction column can be made of glass, so that the change of liquid in the pulsed extraction column can be observed and monitored.

Fig. 1 shows a schematic structural view of a vent valve for a pulsed extraction column according to one embodiment of the present application. As shown in fig. 1, in some embodiments of the present application, the exhaust valve includes a pipe body 10 and a floating plug 20. Wherein, the pipe body 10 comprises an outlet and an inlet, the gas-liquid mixture in the pulse extraction column can flow in from the inlet of the pipe body 10 under the action of the air pulse, and the gas in the gas-liquid mixture can flow out from the outlet of the pipe body 10. The floating plug 20 is located in the pipe body 10, and under the pressure action of the gas-liquid mixture, the floating plug 20 can move up and down along the axial direction of the pipe body 10. The exhaust valve further comprises a first limiting structure 13, wherein the first limiting structure 13 is formed on the pipe body 10 and used for limiting the upward movement range of the floating plug 20. Fig. 2 is a schematic view illustrating the structure of the exhaust valve of fig. 1 when the floating plug moves upward to contact with the first stopper structure. As shown in fig. 2, when the floating plug 20 moves upward under the pressure of the gas-liquid mixture to contact the first limit structure 13, the liquid in the gas-liquid mixture entering the pipe 10 can be blocked from being ejected from the outlet.

In the exhaust valve of the present embodiment, the inlet of the pipe 10 is disposed at the lower end of the pipe 10, and the outlet is disposed at the upper end of the pipe 10. When the exhaust valve is connected to the pulse extraction column, under the action of air pulse, flooding occurs in the pulse extraction column. The liquid level in the settling section of the pulsed extraction column rises rapidly and enters the vent valve from the inlet together with air, which can flow along the tube 10 and out the outlet. Because the pulse intensity is great, the liquid level in the clarification section on the pulse extraction column can rise rapidly to get into the body 10 of discharge valve along with the air together, the floating plug 20 can be under the pressure effect of gas-liquid mixture, along with the liquid level of liquid together upwards remove, until with first limit structure 13 contact, stop moving. When the floating plug 20 contacts the first stopper 13, the liquid in the tube 10 is prevented from being discharged from the outlet at the upper end of the tube 10. When the pressure in the pipe body 10 is reduced, the floating plug 20 may naturally fall down by its own weight. Adopt the discharge valve in this application embodiment, can prevent that pulse extraction post internal liquid from because air pulse intensity is too big and the blowout, improved the operation safety of pulse extraction post, avoided the complicated pipeline design of clarification section gas vent external discharge pipe etc. on pulse extraction post simultaneously, reduced pulse extraction device's complexity and cost.

As shown in fig. 1 and 2, in some embodiments of the present application, the vent valve further includes a second stopper structure 14. The second limit structure 14 is fixed on the inner wall of the pipe body 10 and located below the first limit structure 13, and the second limit structure 14 can limit the downward movement range of the floating plug 20. The air pulse in the pulsed extraction column occurs instantaneously, at which time the floating plug 20 moves upward under the pressure of the gas-liquid mixture. When the air pulse disappears, the liquid level of the liquid in the tube body 10 also falls, and at the moment, the floating plug 20 can fall along with the falling of the liquid level of the liquid in the tube body 10 under the action of the self gravity. When the floating plug 20 falls to be in contact with the second limit structure 14, the floating plug 20 stops moving, and positioning of the floating plug 20 is achieved. The tube 10 and the pulsed extraction column are always in communication with the outside atmosphere from the time when the floating plug 20 moves upward due to the air pulse until the floating plug 20 falls down due to the disappearance of the air pulse, so as to balance the internal and external air pressures.

Set up first limit structure 13 and second limit structure 14 in body 10, can make floating plug 20 reciprocate between first limit structure 13 and second limit structure 14, the restriction floats plug 20's moving range, prevent that floating plug 20 from reciprocating in the great within range in whole body 10, avoid floating plug 20 because the moving distance is great and take place too much friction or collision between 10 with the body, and then cause body 10 or floating plug 20 to damage, prolong discharge valve's life.

Specifically, the second limiting structure 14 may be at least one clamping block circumferentially disposed along the inner wall of the pipe body 10.

FIG. 3 illustrates a schematic view of a cross-section of a vent valve over a second stop structure according to an embodiment of the present application. As shown in fig. 3, the second position-limiting structure 14 may be an annular block circumferentially disposed along the inner wall of the pipe body 10, and the inner diameter of the annular block is smaller than the size of the floating plug 20, so that the floating plug 20 can stay at the second position-limiting structure 14, thereby limiting the downward movement of the floating plug 20.

FIG. 4 is a schematic view of a section of a vent valve above a second stop structure according to another embodiment of the present application. As shown in fig. 4, the second limiting structure 14 may be a plurality of blocks arranged along the circumferential direction of the inner wall of the pipe body 10, and the floating plug 20 may be clamped on the plurality of blocks, so that the floating plug 20 is positioned and the downward movement range thereof is limited. The number of the clamping blocks and the shapes of the clamping blocks are not limited in the embodiment, for example, the number of the clamping blocks can be 2, 3, 4, and the like, and the clamping blocks can be arc-shaped, rectangular, and the like.

As shown in fig. 1 and 2, in some embodiments of the present application, the pipe body 10 includes a connection pipe 11 and an exhaust pipe 12. The floating plug 20 is located in the connecting pipe 11, and the exhaust pipe 12 is disposed at the upper end of the connecting pipe 11 and connected to the connecting pipe 11. The inner diameter of the exhaust pipe 12 is smaller than the size of the floating plug 20, so that the floating plug 20 moves up and down in the connecting pipe 11, and the floating plug 20 is prevented from moving up to the outside of the pipe body 10 under the action of large pressure. At this time, the first limiting structure 13 may be a connecting portion between the connecting pipe 11 and the exhaust pipe 12, where the connecting portion is used to clamp the floating plug 20, so that the floating plug 20 blocks the lower port of the exhaust pipe 12, and prevents liquid in the gas-liquid mixture from entering the exhaust pipe 12. As shown in fig. 1 and 2, the connection portion may be a tapered pipe portion connecting the connection pipe 11 and the exhaust pipe 12.

In some embodiments, the second position-limiting structure 14 is fixed to the inner wall of the connecting pipe 11, so that the floating plug moves up and down in the part of the pipe above the second position-limiting structure 14 in the connecting pipe 11. The connection pipe 11, the exhaust pipe 12, and the connection portion may be integrally formed, and the second stopper structure 14 may be integrally formed with the pipe body 10. The manufacturing method is simple and easy to process, and the integrally formed pipe body 10 is adopted, so that liquid in the gas-liquid mixture cannot leak out from the joint of the connecting pipe 11 and the exhaust pipe 12, and further liquid leakage is avoided. In addition, the tube 10 may be made of glass, such as transparent glass, so that an operator can observe and monitor the state of the liquid in the exhaust valve.

Further, as shown in fig. 1 and 2, the connection pipe 11 is further provided with a bending portion 15 so that the pipe body 10 is in a zigzag shape. Specifically, the part of the connecting pipe 11 located below the bending part 15 is obliquely arranged relative to the exhaust pipe 12 so as to be connected with an exhaust port of the obliquely arranged pulse extraction column, and the length of the connecting pipe 11 can be further extended, so that the liquid entering the pipe body 10 is buffered, and the liquid level in the pipe body 10 is conveniently monitored.

In some embodiments of the present application, the second limiting structure 14 is located above the bent portion 15, and the floating plug 20 moves up and down above the bent portion 15. At this time, the floating plug 20 may move up and down in a vertical portion of the pipe 11 above the bent portion 15, so that the floating plug 20 moves more smoothly, and the floating plug 20 is prevented from moving in the inclined pipe and generating a large friction with the pipe 10.

In some embodiments of the present application, the floating plug 20 may include a hollow body 21, which is configured as a closed hollow structure, and the weight of the floating plug 20 may be reduced, so that the floating plug 20 can move upward under the pressure of the gas-liquid mixture. The floating plug 20 can be made of glass, the hollow body 21 can be in a bulb shape, the hollow body 21 is in the bulb shape, the processing and the forming are easy, and the glass hollow body 21 in the bulb shape is not easy to damage when moving up and down in the tube body. Of course, the hollow body 20 may have other shapes, such as any one of a spherical shape, an ellipsoidal shape, and a spherical-pyramidal shape.

As shown in fig. 1 and 2, the floating plug 20 further includes a guide portion 22, and the guide portion 22 is connected to a lower portion of the hollow body 21 and is used for guiding when the floating plug 20 moves up and down. The guide part 22 is connected to the lower part of the hollow body 21, so that the center of gravity of the floating plug 20 is inclined downwards, and the floating plug 20 is similar to a tumbler structure as a whole. When the floating plug 20 moves up and down along the axial direction of the pipe body 10, the guide part 22 is always positioned below the hollow main body 21, so that the floating plug 20 is prevented from rotating greatly and even turning over, the floating plug 20 is further prevented from being damaged due to collision between the large-amplitude rotation and the pipe body 10, and the service life of the floating plug is prolonged. In some embodiments, the guiding portion 22 may be a solid structure, which effectively moves the center of gravity of the floating plug 20 downward while ensuring that the floating plug 20 can move upward under the pressure, so that the floating plug 20 is heavy and light, and plays a good guiding role.

It should be noted that, the whole exhaust valve in the embodiment of the present application can all be made of glass, which is beneficial to observing and monitoring the liquid entering the exhaust valve, and meanwhile, the exhaust valve made of glass material has the characteristics of corrosion resistance, easy cleaning and easy processing and manufacturing.

Embodiments of the present application also provide a pulse extraction apparatus, which includes a pulse extraction column and the exhaust valve 100 in the above embodiments. Fig. 5 shows a schematic view of the discharge valve of fig. 1 connected to a pulsed extraction column. As shown in fig. 5, the exhaust valve 100 is detachably coupled to an exhaust port 200 of the pulse extraction column to exhaust gas when an air pulse is generated in the pulse extraction column. When air pulse is generated in the pulse extraction column, flooding occurs in the pulse extraction column, a gas-liquid mixture in the pulse extraction column rapidly rises under the pressure of the air pulse and enters the exhaust valve 100, the floating plug 20 can move upwards under the pressure action of the gas-liquid mixture, and the floating plug 20 stops the liquid in the gas-liquid mixture from being sprayed out when moving to be in contact with the first limiting structure 13.

Further, as shown in fig. 5, the pulse extraction apparatus further includes a connector 300, wherein one end of the connector 300 is connected to the inlet of the pipe 10 of the exhaust valve 100, and the other end is connected to the exhaust port 200 of the pulse extraction column. And, a communication part for communicating the exhaust valve 100 and the exhaust port 200 of the pulse extraction column is provided inside the connection member 300.

Specifically, the connector 300 may include a tubular member and a fastener. One end of the inlet of the tube body 10 of the discharge valve 100 is inserted into the tubular member from one end thereof, and the discharge port 200 of the pulse extraction column is inserted into the tubular member from the other end thereof. In some embodiments, the inner diameter of the tube 10 may be slightly larger than the outer diameter of the vent, and the tube 10 may be sleeved outside the vent to achieve connection. In particular, a positioning portion may be further provided in the tubular member to limit the insertion position of the pipe body 10 and the exhaust port 200 into the tubular member. The fastening member is sleeved outside the tubular member and used for fixing and clamping the pipe body 10 and the exhaust port 200 inserted in the tubular member. In addition, the connector 300 may further include an elastic washer disposed between the tubular member and the fastening member to seal and protect the pulse extraction column and the exhaust valve body. For example, the connector 300 may be a ferrule commonly used to connect pipes.

The pulse extraction device in the embodiment of the application also comprises an air pulse generator.

In addition, the exhaust valve 100 of the pulse extraction device in the present embodiment has the same structure and operation principle as those of the exhaust valve of the previous embodiment, and is not described herein again.

The present application will be described in further detail with reference to specific examples.

The exhaust valve 100 is connected to the exhaust port 200 of the clarification section on the pulse extraction column and is fixed and sealed by a clamping sleeve.

The two-phase feed to the pulsed extraction column was turned on. Wherein the aqueous phase can be a nitric acid solution with a preset concentration, for example, a 0.3mol/L nitric acid solution, and the organic phase can be 30% TBP/kerosene. The two-phase feed is controlled to be fed at a certain rate, for example, the feed rate of the aqueous phase can be 198mL/min, and the feed rate of the organic phase can be 265 mL/min.

At the same time, the air pulse generator is turned on and the intensity of the air pulse is adjusted. For example, the air pulse may have a pulse amplitude of 3cm/cycle and a pulse frequency of 40 cycles/min.

After the air pulse generator is started, the two phases in the pulse extraction column can be caused to generate flooding. The liquid level in the settling section of the pulsed extraction column rises rapidly and enters the vent valve 100. The floating plug 20 moves up rapidly along with the rise of the liquid level under the pressure of the gas-liquid mixture entering the pipe body 10 until the floating plug moves up to the first limiting structure 13 (for example, a conical pipe part) to block the lower port of the exhaust pipe 12, so that the floating plug 20 blocks the liquid in the pipe body 10 from entering the exhaust pipe 12 and being sprayed out from the outlet at the upper end of the pipe body 10. When the liquid level in the pipe body 10 drops, the floating plug 20 drops to the second limit structure 14 (e.g., an annular block) along with the drop of the liquid level. In the process, the pulse extraction column is always kept in a state of being communicated with the external atmosphere.

By adopting the pulse extraction device in the embodiment, the metals in the nitric acid solution or the radioactive feed liquid can be extracted. Wherein, discharge valve can block the blowout of liquid, has avoided spouting the emergence of material phenomenon, has improved the security of pulse extraction device operation. Meanwhile, the complex design of using an external water phase discharge pipe and the like is avoided, and the cost of the pulse extraction device is reduced.

It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.

Claims

1. A vent valve for a pulsed extraction column, comprising:

the tube body (10) comprises an outlet and an inlet, a gas-liquid mixture in the pulse extraction column flows in from the inlet of the tube body (10) under the action of air pulse, and gas in the gas-liquid mixture flows out from the outlet of the tube body (10);

the floating plug (20) is positioned in the pipe body (10), and under the pressure action of the gas-liquid mixture, the floating plug (20) can move up and down along the axial direction of the pipe body (10);

the first limiting structure (13) is formed on the pipe body (10) and is used for limiting the upward movement range of the floating plug (20);

when the floating plug (20) moves upwards to be in contact with the first limiting structure (13), liquid in the gas-liquid mixture entering the pipe body (10) is blocked from being sprayed out of the outlet.

2. The discharge valve according to claim 1, further comprising:

and the second limiting structure (14) is fixed on the inner wall of the pipe body (10), and the second limiting structure (14) is positioned below the first limiting structure (13) so as to limit the downward movement range of the floating plug (20).

3. Exhaust valve according to claim 1 or 2,

the pipe body (10) includes:

the connecting pipe (11), the floating plug (20) is positioned in the connecting pipe (11);

the exhaust pipe (12), the exhaust pipe (12) set up in the upper end of connecting pipe (11) and with connecting pipe (11) are connected, the internal diameter of exhaust pipe (12) is less than the size of floating plug (20).

4. A vent valve according to claim 3, wherein the first stop arrangement (13) comprises:

a connection part of the connection pipe (11) and the exhaust pipe (12),

the connecting part is used for clamping the floating plug (20) so that the floating plug (20) plugs the lower port of the exhaust pipe (12).

5. The discharge valve according to claim 3,

the second limiting structure (14) is fixed on the inner wall of the connecting pipe (11).

6. An air vent valve according to claim 2 or 5, wherein the second retaining structure (14) comprises:

at least one clamping block is arranged along the circumferential direction of the inner wall of the pipe body (10).

7. The exhaust valve according to claim 1, characterized in that said floating plug (20) comprises:

a hollow body (21) for enabling the floating plug (20) to move upwards under the action of the pressure.

8. The discharge valve according to claim 7,

the hollow body (21) comprises one of a bulb shape, a spherical shape, an ellipsoid shape and a spherical cone shape.

9. The exhaust valve according to claim 7, characterized in that said floating plug (20) further comprises:

and the guide part (22) is connected to the lower part of the hollow main body (21) and is used for guiding when the floating plug (20) moves up and down.

10. The discharge valve according to claim 9,

the guide part (22) is of a solid structure.

11. A vent valve according to any of claims 3 to 10, wherein the connecting tube (11) is provided with a bend (15) and the tubular body (10) is of a dogleg type.

12. An exhaust valve according to claim 11, characterised in that a second stop formation (14) is located above the bend (15), the float (20) moving up and down above the bend (15).

13. A pulsed extraction apparatus, comprising:

a pulse extraction column is arranged in the column,

and a gas discharge valve (100) according to any of claims 1 to 12, said gas discharge valve (100) being detachably connected to a gas discharge port (200) of said pulsed extraction column for discharging gas when a pulse of air is generated in said pulsed extraction column;

the gas-liquid mixture in the pulse extraction column rises under the pressure of air pulse and enters the exhaust valve (100), the floating plug (20) moves upwards under the pressure action of the gas-liquid mixture, and the floating plug (20) is used for blocking liquid in the gas-liquid mixture from being sprayed out when the floating plug moves to be in contact with the first limiting structure (13).

14. A pulse extraction apparatus according to claim 13, further comprising:

the connecting piece (300), the one end of connecting piece (300) connect in the entry of body (10) of discharge valve (100), the other end connect in gas vent (200), be used for the intercommunication discharge valve (100) with gas vent (200).