Radioactive feed liquid sampling container and sampling system

Abstract

The invention discloses a radioactive feed liquid sampling container which comprises a small sampling chamber, a feeding pipe, a sampling needle and a baffle, the feeding pipe and the sampling needle are both communicated with the inner space of the small sampling chamber, and the baffle is located in the small sampling chamber and arranged between the feeding pipe and the sampling needle in a blocking mode so that the feeding pipe and the sampling needle can be separated in different space areas. A gap is formed in the baffle plate, so that feed liquid entering the small sampling chamber through the feeding pipe can reach a space area in which the sampling needle is positioned through the gap. According to the radioactive feed liquid sampling container, the internal gas-liquid mixing degree can be effectively reduced, gas is prevented from entering the sampling needle, the sampling success rate is increased, and the sampling efficiency is guaranteed. The invention further provides a radioactive feed liquid sampling system.

Description

Technical Field

[0001] The invention specifically relates to a radioactive liquid sampling container and a sampling system. Background Art

[0002] The process liquid in the spent fuel reprocessing plant is highly radioactive and toxic. Operators cannot directly contact the liquid and can only sample the material in the system indirectly. Therefore, vacuum-assisted air lifting is usually used to sample radioactive liquid. This method is simple in principle and uses maintenance-free equipment to the greatest extent. However, the self-developed sampling cabinet currently used in the reprocessing pilot plant has a high mechanical failure rate, poor sampling representativeness, complex operation, and low sampling efficiency.

[0003] The main reason is that during actual engineering operations, when the vacuum-assisted air lifting method lifts the liquid along the feed pipe to the sampling chamber, there will be a large amount of gas in the sampling chamber, causing the internal material to be in a state of gas-liquid mixture, resulting in the presence of bubbles and liquid near the sampling needle. The sampling gas occupies a large amount, so the amount of liquid in the subsequent sampling bottle is small, resulting in sampling failure. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a radioactive liquid sampling container in view of the above-mentioned deficiencies in the prior art, which can effectively reduce the degree of gas-liquid mixing inside, prevent gas from entering the sampling needle, improve the sampling success rate, and ensure the sampling efficiency. The present invention also provides a radioactive liquid sampling system.

[0005] The present invention provides a radioactive liquid sampling container, comprising a sampling chamber, a feed pipe, a sampling needle and a baffle, wherein the feed pipe and the sampling needle are both connected to the internal space of the sampling chamber, the baffle is located in the sampling chamber and is disposed between the feed pipe and the sampling needle to separate the feed pipe and the sampling needle into different spatial areas, and a gap is provided on the baffle to allow the liquid entering the sampling chamber through the feed pipe to reach the spatial area where the sampling needle is located through the gap.

[0006] Furthermore, the feed tube and the sampling needle are both connected to the inner space of the sampling chamber in the vertical direction, and the baffle is arranged in the sampling chamber in the vertical direction.

[0007] Furthermore, the sampling container also includes a reflux pipe, which is connected to the internal space of the sampling chamber, the opening in the feed pipe connected to the sampling chamber is located on the bottom wall of the sampling chamber, the sampling needle passes through the top wall of the sampling chamber, the opening end of the sampling needle is located in the middle of the sampling chamber, and the opening in the reflux pipe located inside the sampling chamber is at a height higher than the height of the opening end of the sampling needle.

[0008] Furthermore, the gap is provided at the connection position between the baffle plate and the inner wall of the sampling chamber, and / or the gap is provided in the middle of the baffle plate, and / or the gap is a mesh provided on the baffle plate.

[0009] Furthermore, the sampling chamber comprises a container body and an upper cover, the top of the container body is provided with an opening, the upper cover is fixedly connected to the top opening of the container body, and the sampling needle is installed on the upper cover.

[0010] The present invention also provides a radioactive liquid sampling system, comprising a storage tank, an air lift and the above-mentioned radioactive liquid sampling container, wherein the feed pipe of the radioactive liquid sampling container is connected to the storage tank, and the connecting pipe is provided with an air lift to lift the liquid to the sampling chamber by air lifting, and the reflux pipe is connected to the storage tank to transport the overflowed liquid back to the storage tank.

[0011] Furthermore, the sampling system also includes an intermediate container and a compressed air ejector, wherein the intermediate container is connected to the connecting pipeline between the reflux pipe and the storage tank, and the vacuum tube of the compressed air ejector is connected to the intermediate container for providing negative pressure to the storage tank so that the liquid in the storage tank rises to the bottom section of the air lift.

[0012] Furthermore, the compressed air ejector is started by compressed air of 0.5MPa to 0.7MPa.

[0013] Furthermore, the air lifter uses 0.2MPa to 0.3MPa compressed air to perform air lifting of the slurry.

[0014] Furthermore, the sampling system also includes a sampling bottle, the interior of the sampling bottle is a negative pressure space, one end of the sampling needle of the radioactive liquid sampling container is connected to the internal space of the sampling chamber, and the other end is used to connect to the internal space of the sampling bottle during sampling, so as to transport the liquid to the interior of the sampling bottle through the negative pressure in the sampling bottle.

[0015] The radioactive liquid sampling container of the present invention separates the space area inside the sampling chamber by a baffle, so that the feed pipe and the sampling needle are respectively located in different space areas, and the gap opened enables the two space areas to communicate with each other.

[0016] Through this setting structure, when the feed liquid enters the sampling chamber through the feed pipe in an air-lifted manner, it will not reach the sampling needle directly, but will first reach the space where the feed pipe is located, and then pass through the gap to reach the space where the sampling needle is located before being sampled by the sampling needle. Therefore, the material originally in a gas-liquid mixed state cannot directly enter the sampling needle, and the flow path of the feed liquid itself is complicated. This process provides sufficient gas-liquid separation conditions, greatly increases the degree of gas-liquid separation, prevents the gas from following the liquid into the vicinity of the sampling needle, and ensures that the sampling needle is completely immersed in the liquid, thereby improving the success rate of sampling.

[0017] Moreover, since a baffle is added inside the sampling chamber, the volume inside the sampling chamber is smaller, and the liquid level is easier to rise, which will better submerge the sampling needle. Compared with the existing sampling container, the sampling container can achieve the above effects by adding a baffle, and has the advantages of simple structure, flexible operation, improved sampling success rate, and guaranteed sampling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the structure of the radioactive liquid sampling container in Example 1 of the present invention;

[0019] Figure 2 This is a schematic diagram of the interior of the radioactive liquid sampling container in Example 1 of the present invention;

[0020] Figure 3 yes Figure 1 K-direction schematic diagram;

[0021] Figure 4 yes Figure 1 Schematic diagram of L direction;

[0022] Figure 5 yes Figure 1 Schematic diagram of BB cross section.

[0023] Figure 6 It is a schematic diagram of the structure of the radioactive liquid sampling system in Example 2 of the present invention.

[0024] In the figure: 1. sampling chamber; 11. container body; 12. upper cover; 2. feed pipe; 3. sampling needle; 4. baffle; 41. gap; 5. return pipe; 6. storage tank; 61. air lift; 7. intermediate container; 8. compressed air ejector; 9. sampling cabinet. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0027] In the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0029] The spent fuel processed by the demonstration plant has a higher burnup, stronger radioactivity, and high continuous production capacity requirements, which puts higher requirements on the safety, reliability, convenience, accuracy and speed of the sampling system. Therefore, the present invention improves the structure of the sampling chamber through the following embodiments, reduces the gas-liquid mixing state near the sampling needle that affects the sampling, and facilitates sampling.

[0030] Example 1

[0031] The radioactive liquid sampling container of this embodiment can be used in the field of nuclear engineering technology, and relates to a device that optimizes the pneumatic sampling device and the sampling chamber structure to allow the liquid to circulate better, thereby improving the success rate of automatic sampling.

[0032] like Figures 1 to 5 As shown, specifically, the sampling container includes a sampling chamber 1, a feed tube 2, a sampling needle 3 and a baffle 4, the feed tube 2 and the sampling needle 3 are both connected to the internal space of the sampling chamber 1; the baffle 4 is located in the sampling chamber 1, and is blocked between the feed tube 2 and the sampling needle 3 to separate the feed tube 2 and the sampling needle 3 into different space areas, and a gap 41 is opened on the baffle 4 to allow the feed liquid entering the sampling chamber 1 through the feed tube 2 to reach the space area where the sampling needle 3 is located through the gap 41.

[0033] In this embodiment, the space area inside the sampling chamber 1 is separated by the baffle 4, so that the feed pipe 2 and the sampling needle 3 are respectively in different space areas, and the gap 41 is opened to enable the two space areas to communicate with each other. Through this setting structure, when the feed liquid enters the sampling chamber through the feed pipe 2 in an air-lifting manner, it will not directly reach the sampling needle 3, but first reach the space where the feed pipe 2 is located, and then pass through the gap 41 to reach the space where the sampling needle 3 is located before being sampled by the sampling needle 3. Therefore, the material originally in a gas-liquid mixed state cannot directly enter the sampling needle 3, and the flow path of the feed liquid itself is complicated. This process provides sufficient gas-liquid separation conditions, greatly increases the degree of gas-liquid separation, prevents the gas from following the liquid into the vicinity of the sampling needle 3, and ensures that the sampling needle 3 is completely immersed in the liquid, so as to improve the success rate of sampling.

[0034] And because the baffle plate 4 is added inside the sampling chamber 1, the internal volume of the sampling chamber 1 is smaller, and the liquid level is easier to rise, which will better submerge the sampling needle 3. Compared with the existing sampling container, the sampling container can achieve the above effects by adding the baffle plate 4, and has the advantages of simple structure, flexible operation, improved sampling success rate, and guaranteed sampling efficiency.

[0035] In this embodiment, the feed pipe 2 and the sampling needle 3 are both connected to the inner space of the sampling chamber 1 along the vertical direction, and the baffle 4 is arranged in the sampling chamber 1 along the vertical direction.

[0036] In this embodiment, the sampling container also includes a reflux pipe 5, which is connected to the internal space of the sampling chamber 1. The opening of the feed pipe 2 connected to the sampling chamber 1 is located on the bottom wall of the sampling chamber 1. The sampling needle 3 passes through the top wall of the sampling chamber 1. The opening end of the sampling needle 3 is located in the middle of the sampling chamber 1. The opening of the reflux pipe 5 located inside the sampling chamber 1 is located at a height higher than the height of the opening end of the sampling needle 3. The reflux pipe 5 is used for overflow. When the feed liquid in the sampling chamber 1 is higher than the opening height of the reflux pipe 5, it will overflow through the reflux pipe 5. The opening end of the sampling needle 3 is lower than the reflux pipe 5, which can ensure that the sampling needle 3 can obtain the feed liquid.

[0037] The aforementioned gap 41 is provided at the junction of the baffle 4 and the inner wall of the sampling chamber 1, and / or the gap 41 is provided in the middle of the baffle 4, and / or the gap 41 is a mesh provided on the baffle 4. That is, the form of the baffle 4 is not limited, and it can be a whole piece, or it can be broken in the middle, or even multiple sections, or it can be mesh-shaped. The baffle 4 can also be as close to the top as possible or as close to the bottom as possible, as long as it can separate the feed pipe 2 and the sampling needle 3. Generally, a gap is left at the bottom so that the feed liquid can better fill the chamber after feeding.

[0038] Specifically in this embodiment, Figure 2As shown, the baffle 4 is a rectangular plate structure, and the material of the baffle 4 is not limited, as long as it can adapt to the liquid environment. A gap 41 (about 1 cm) is provided between the baffle 4 and the top wall and the bottom wall of the sampling chamber 1. The vertical direction is the direction of gravity. After the liquid enters the sampling chamber 1 through the feed pipe 2, the gas-liquid mixed material will first separate due to gravity, and the liquid will sink to the bottom and can enter the area where the sampling needle 3 is located through the gap at the bottom of the baffle 4.

[0039] In other embodiments, the baffle 4 can also be configured as an upper and lower (or left and right) split structure with a gap 41 in the middle, or the baffle 4 is a plate-like component densely covered with a mesh structure (that is, the baffle 4 is a mesh structure). When the feed liquid passes through the mesh, the turbulence of the feed liquid is further increased to achieve gas-liquid separation.

[0040] In this embodiment, the sampling chamber 1 includes a container body 11 and an upper cover 12. The top of the container body 11 is provided with an opening. The upper cover 12 is fixedly connected to the top opening of the container body 11. The sampling needle 3 is installed on the upper cover 12. In this embodiment, a sealing ring can also be provided at the contact position between the upper cover 12 and the container body 11 to achieve a sealed connection between the two.

[0041] In general, the sampling steps of the sampling container of this embodiment are as follows: the feed liquid enters the sampling chamber 1 from the feed pipe 2, the baffle 4 separates the gas and liquid, and the liquid enters the area where the sampling needle 3 is located on the right side, immersing the sampling needle 3. The sampling container of this embodiment has a simple structure and flexible operation. By adding the baffle 4, it is ensured that when the feed liquid enters the sampling container by air lifting, the gas and liquid are separated, and the sampling needle 3 is ensured to be completely immersed in the liquid, thereby improving the sampling success rate.

[0042] Example 2

[0043] The radioactive liquid sampling system of this embodiment is as follows: Figure 6 As shown, it includes a storage tank 6, an air lift 61 and the radioactive liquid sampling container in Example 1, wherein the feed pipe 2 and the return pipe 5 of the radioactive liquid sampling container are used to be connected to process equipment or pipelines. In this embodiment, the feed pipe 2 of the radioactive liquid sampling container is connected to the storage tank 6, and an air lift 61 is provided on the connecting pipeline to lift the liquid to the sampling chamber 1 by air lifting; the return pipe 5 is connected to the storage tank 6 and is used to transport the overflowed liquid back to the storage tank 6.

[0044] In this embodiment, the sampling system also includes an intermediate container 7 and a compressed air ejector 8. The intermediate container 7 is connected to the connecting pipeline between the reflux pipe 5 and the storage tank 6. The vacuum tube of the compressed air ejector 8 is connected to the intermediate container 7, which is used to provide negative pressure to the storage tank 6 so that the liquid in the storage tank 6 rises to the bottom section of the air lift 61.

[0045] In this embodiment, the compressed air ejector 8 is started by compressed air of 0.5MPa to 0.7MPa, preferably 0.6MPa in this embodiment. The air lifter 61 is air-lifted by compressed air of 0.2MPa to 0.3MPa, preferably 0.3MPa in this embodiment.

[0046] In this embodiment, the sampling system further includes a sampling cabinet 9, and the radioactive liquid sampling container is contained in the sampling cabinet 9 and fixed on the bottom plate of the sampling cabinet 9. That is, the sampling chamber 1 is fixed on the bottom plate of the sampling cabinet 9, and the bottom of the sampling chamber 1 has a feed pipe 2 and a reflux pipe 5, and the upper cover 12 is fixed on the container body 11 of the sampling chamber, and the sampling needle 3 is installed in the center of the upper cover 12. After the sampling system is turned on, the sampling bottle with negative pressure drawn is inserted into the sampling needle 3 and stays for a period of time to complete the sampling operation.

[0047] In this embodiment, the sampling system also includes a sampling bottle, the interior of the sampling bottle is a negative pressure space, one end of the sampling needle 3 of the radioactive liquid sampling container is connected to the internal space of the sampling chamber 1, and the other end is used to connect to the internal space of the sampling bottle during sampling, so as to transport the liquid to the interior of the sampling bottle through the negative pressure in the sampling bottle.

[0048] In general, this embodiment provides a material sampling system in a spent fuel reprocessing plant system. The sampling system of this embodiment adopts a vacuum-assisted air extraction method for material-liquid circulation, and mainly includes a sampling cabinet 9, a compressed air ejector 8, an intermediate container 7, a sampling bottle and a storage tank 6.

[0049] The power of the sampling system comes from compressed air. 0.6MPa (absolute pressure, the same below) of compressed air (through the A6 pipeline) is required to start the compressed air ejector 8 to create negative pressure for the sampling system, lift the liquid in the storage tank 6 to a certain height, and then use 0.3MPa compressed air (through the A3 pipeline to reach the air lift 61) to lift the liquid, so that the liquid enters the sampling chamber 1.

[0050] The air-lifted gas and liquid flow through the reflux pipe 5 in the sampling chamber 1 to the intermediate container 7. The gas and liquid are separated in the intermediate container, the gas is discharged through the compressed air ejector 8, and the liquid flows back to the process system.

[0051] The specific sampling operation process is as follows: first, the sampling bottle is sucked to a certain negative pressure, which is -70 to -75 kPa in this embodiment;

[0052] Open the compressed air ejector 8 to form a certain negative pressure in the storage tank 6, so that the liquid in the storage tank 6 submerges the air lift bottom section of the air lift 61;

[0053] The bottom section of the air lifter 61 is opened to compress the air, and the liquid enters the sampling chamber 1 through air lifting, and then the overflowing liquid overflows into the intermediate container 7 and finally returns to the storage tank 6, forming a cycle;

[0054] Then, a sampling bottle with negative pressure prepared in advance is used to insert a sampling needle 3 to suck the feed liquid into the sampling bottle from the sampling chamber 1.

[0055] After sampling, the compressed air of the air lift 61 (A3) and the compressed air ejector 8 (A6) is turned off.

[0056] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A radioactive liquid sampling container, characterized in that: It comprises a sampling chamber (1), a feed pipe (2), a sampling needle (3) and a baffle (4). The feed pipe (2) and the sampling needle (3) are both connected to the internal space of the sampling chamber (1). The baffle (4) is located in the sampling chamber (1) and is disposed between the feed tube (2) and the sampling needle (3) to separate the feed tube (2) and the sampling needle (3) into different spatial areas. Furthermore, a gap (41) is provided on the baffle (4) to allow the liquid entering the sampling chamber (1) through the feed pipe (2) to reach the space area where the sampling needle (3) is located through the gap (41).

2. The radioactive liquid sampling container according to claim 1, characterized in that: The feed pipe (2) and the sampling needle (3) are both connected to the internal space of the sampling chamber (1) in a vertical direction. The baffle (4) is arranged in the sampling chamber (1) along the vertical direction.

3. The radioactive liquid sampling container according to claim 2, characterized in that: It also includes a reflux pipe (5), wherein the reflux pipe (5) is connected to the inner space of the sampling chamber (1). The opening in the feed pipe (2) communicating with the sampling chamber (1) is located on the bottom wall of the sampling chamber (1). The sampling needle (3) passes through the top wall of the sampling chamber (1), and the opening end of the sampling needle (3) is located in the middle of the sampling chamber (1). The height of the opening of the reflux tube (5) located inside the sampling chamber (1) is higher than the height of the opening end of the sampling needle (3).

4. The radioactive liquid sampling container according to claim 1 or 2, characterized in that: The gap (41) is provided at the connection position between the baffle plate (4) and the inner wall of the sampling chamber (1), and / or the gap (41) is provided in the middle of the baffle plate (4), and / or the gap (41) is a mesh provided on the baffle plate (4).

5. The radioactive liquid sampling container according to claim 1, characterized in that: The sampling chamber (1) comprises a container body (11) and an upper cover (12). The top of the container body (11) is provided with an opening. The upper cover (12) is fixedly connected to the top opening of the container body (11). The sampling needle (3) is installed on the upper cover (12).

6. A radioactive liquid sampling system, characterized in that: It comprises a storage tank (6), an air lifter (61) and the radioactive liquid sampling container as claimed in claim 3, The feed pipe (2) of the radioactive liquid sampling container is connected to the storage tank (6), and an air lifter (61) is provided on the connecting pipe to lift the liquid to the sampling chamber (1) by air lifting. The reflux pipe (5) is connected to the storage tank (6) and is used to transport the overflowed liquid back to the storage tank (6).

7. The radioactive liquid sampling system according to claim 6, characterized in that: It also includes an intermediate container (7) and a compressed air ejector (8), The intermediate container (7) is connected to the connecting pipeline between the reflux pipe (5) and the storage tank (6). The vacuum pipe of the compressed air ejector (8) is connected to the intermediate container (7) and is used to provide negative pressure to the storage tank (6) so that the liquid in the storage tank (6) rises to the bottom section of the air lift (61).

8. The radioactive liquid sampling system according to claim 7, characterized in that: The compressed air ejector (8) is started by using compressed air of 0.5 MPa to 0.7 MPa.

9. The radioactive liquid sampling system according to claim 7, characterized in that: The air lifter (61) uses compressed air of 0.2MPa to 0.3MPa to perform air lifting of the liquid feed.

10. The radioactive liquid sampling system according to claim 6, characterized in that: It also includes a sampling bottle, wherein the interior of the sampling bottle is a negative pressure space. One end of the sampling needle (3) of the radioactive liquid sampling container is connected to the internal space of the sampling chamber (1), and the other end is used to connect to the internal space of the sampling bottle during sampling, so as to transport the liquid into the sampling bottle through the negative pressure in the sampling bottle.

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