Anion leacheate generating device

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to an anion leacheate generating device. According to the device, a liquid injection pipe and an air outlet are arranged above a tank body, a tank opening in the bottom end of the tank body is in threaded connection to an upper opening of a hollow structure of an upper cover, and an anode plate is located in the hollow structure of the upper cover; a first bulge at the bottom end of the extension part of the upper cover tightly presses the cation exchange membrane on the upper end surface of a second bulge, and a cathode plate is arranged at the bottom end in the second bulge; a liquid injection opening and an outflow opening are formed in the lower cover; to-be-treated liquid is injected into the tank body from the liquid injection pipe, is in full contact with the anode plate and is stored above the cation exchange membrane, and pure water enters an area, between the cation exchange membrane and the cathode plate, in the lower cover from the liquid injection port and receives cations penetrating out of the cation exchange membrane; and leacheate with set concentration is formed and flows into the liquid degassing pipeline from the outflow port for degassing treatment. The structure is simple and compact, and leacheate reaction can be efficiently carried out.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power, and particularly relates to an anion eluent generating device. Background Art

[0002] In the field of modern analytical chemistry, especially in ion chromatography technology, the quality and performance of the eluent play a crucial role in the accuracy and reliability of the analysis results. As the key medium for promoting the separation and detection of each component in the sample in the chromatographic column, the degassing link in the preparation process of the eluent is an important part that cannot be ignored.

[0003] Traditional eluent preparation methods have exposed many defects. In the early eluent preparation process, degassing mainly used simple methods such as stirring or static degassing. However, these methods can only remove some larger bubbles in the eluent, and their removal effect on the tiny gas molecules dissolved in it is extremely limited. These dissolved gases will cause a series of serious problems in the ion chromatography analysis process: changing the chemical properties of the sample, interfering with the true response signal of ions during the analysis process, and ultimately resulting in deviations or errors in the analysis results.

[0004] In recent years, although some improved degassing technologies have begun to be applied to eluent preparation, such as the introduction of on-line degassing devices, which have improved the degassing efficiency to a certain extent. However, the existing on-line degassing equipment still has many limitations. Some on-line degassing devices use vacuum degassing methods. Due to the difficulty in achieving the ideal vacuum level or the unreasonable structure design of the degassing chamber, the residence time of the eluent in the degassing chamber is too short, and the gas-liquid contact area is limited, so that the dissolved gases cannot be removed sufficiently. In addition, some degassing devices based on the principle of membrane permeation, although they can selectively remove certain gases to a certain extent, the performance limitations of the membrane material and the membrane fouling problem lead to a significant reduction in their long-term stability and degassing efficiency.

[0005] In addition, under the requirements of high-throughput analysis of some large-scale samples and rapid separation and detection of multiple ions in complex samples, the large-flow and high-flow-rate supply of the eluent has become a necessary condition. However, while the existing eluent generators meet the requirements of large flow and high flow rate, it is difficult to take into account the degassing efficiency. When the flow rate increases, the solubility of gas in the eluent will change, and traditional degassing devices often have problems such as incomplete gas-liquid separation and insufficient degassing time at high flow rates, resulting in a sharp decline in the degassing effect. In some fields with extremely high requirements for analysis accuracy, such as the analysis of trace pollutants in environmental monitoring, the detection of trace ions in biological samples, and the monitoring of impurity ions in the semiconductor manufacturing process, the presence of trace dissolved gases in the eluent may cause serious consequences. Therefore, it is urgent to improve the degassing efficiency of the eluent. Summary of the Invention

[0006] To overcome the problems existing in the related art, an anion eluent generation device is provided.

[0007] According to one aspect of the embodiments of the present disclosure, an anion eluent generation device is provided, and the device includes: a tank body, an upper cover, a lower cover, and a degassing pipeline. A liquid injection pipe and an air outlet are provided above the tank body;

[0008] The upper cover is axially provided with a through hollow structure. The tank opening at the bottom end of the tank body is threadedly connected to the upper opening of the hollow structure of the upper cover. The anode plate is located in the hollow structure of the upper cover and is connected to an external power supply system through an anode interface;

[0009] The lower end of the hollow structure of the upper cover has an extended portion protruding axially downward. The opening end face at the bottom end of the extended portion has a first protrusion circumferentially. The upper end of the lower cover is axially provided with a groove, and the bottom surface of the groove has a second protrusion axially upward. Both the first protrusion and the second protrusion are annular structures. The first protrusion presses the cation exchange membrane tightly on the upper end face of the second protrusion. A cathode plate is provided at the bottom end inside the second protrusion. The cathode plate is connected to an external power supply system through a cathode interface; The lower cover also has a liquid injection port and a flow outlet, and the flow outlet and the liquid injection port are on the same horizontal line;

[0010] The liquid to be processed is injected into the tank body from the liquid injection pipe, comes into full contact with the anode plate, and is stored above the cation exchange membrane. Pure water enters the area between the cation exchange membrane and the cathode plate in the lower cover from the liquid injection port, receives the cations passing through the cation exchange membrane, and forms an eluent with a set concentration and flows out from the flow outlet to the liquid degassing pipeline for degassing treatment.

[0011] In a possible implementation, the degassing pipeline includes a liquid pipe. There is a spiral diversion groove inside the liquid pipe. A plurality of openings are provided in the liquid pipe. Inert gas is injected into the liquid pipe from each opening. The eluent will rotate along with the spiral diversion pipe inside the liquid pipe and is fully mixed with the mixed inert gas at the same time. The degassing pipe is connected to the liquid pipe, and a vacuum box is sleeved outside the degassing pipe; The material of the degassing pipe can permeate air and block water. When the eluent flows through the degassing pipe, the gas in the eluent is extracted by the negative pressure formed by the vacuum box.

[0012] In a possible implementation, a heater is also installed on the outer wall of the liquid pipe.

[0013] In a possible implementation, the heating temperature of the heater is not higher than 10 °C.

[0014] In a possible implementation, the spiral angle of the spiral diversion groove in the liquid pipe is 15°.

[0015] In a possible implementation, the depth of the diversion groove is 0.1 times the diameter of the liquid pipe.

[0016] In a possible implementation, the inert gas is any one of helium, neon, and argon.

[0017] In a possible implementation, the liquid outlet end of the liquid injection pipe is closely attached to the inner wall of the tank body.

[0018] In a possible implementation, the direction of the gas outlet is obliquely downward.

[0019] In a possible implementation, the diameter of the liquid injection pipe is not greater than 0.1 times the diameter of the gas outlet.

[0020] The beneficial effects of the present disclosure are as follows: In the anion eluent generating device provided by the present disclosure, a liquid injection pipe and a gas outlet are provided above the tank body. The tank opening at the bottom end of the tank body is threadedly connected to the upper opening of the hollow structure of the upper cover. The anode plate is located inside the hollow structure of the upper cover. The first protrusion at the bottom end of the extended part of the upper cover tightly presses the cation exchange membrane against the upper end face of the second protrusion, and a cathode plate is provided at the bottom end inside the second protrusion. There are also a liquid injection port and a liquid outlet on the lower cover, and the liquid outlet and the liquid injection port are on the same horizontal line. The liquid to be processed is injected into the tank body through the liquid injection pipe, fully contacts the anode plate, and is stored above the cation exchange membrane. Pure water enters the area between the cation exchange membrane and the cathode plate in the lower cover through the liquid injection port, receives the cations passing through the cation exchange membrane, and forms an eluent with a set concentration and flows out through the liquid outlet to the liquid degassing pipeline for degassing treatment. The structure is simple and compact, and can efficiently carry out the eluent generation reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of an anion eluent generating device shown in an embodiment of the present disclosure.

[0022] Figure 2 is a front view of an anion eluent generating device shown in an embodiment of the present disclosure.

[0023] Figure 3 is a schematic diagram of the degassing pipeline of an anion eluent generating device shown in an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Unless otherwise defined, the technical and scientific terms used in this disclosure have the same meanings as those commonly understood by those skilled in the art to which this disclosure pertains; the terms used in this disclosure are only for the purpose of describing specific embodiments and are not intended to limit this disclosure; the term "including" and any variations thereof in this disclosure are intended to cover non-exclusive inclusion. Obviously, the embodiments described in this disclosure are only a part of the embodiments of this disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this disclosure without creative efforts belong to the scope of protection of this disclosure.

[0026] Reference to "embodiment" in this disclosure means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this disclosure. The phrase does not necessarily refer to the same embodiment when it appears in various positions in the specification, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0027] Figure 1 is a cross-sectional view of an anion eluent generation device shown in an embodiment of this disclosure, Figure 2 is a front view of an anion eluent generation device shown in an embodiment of this disclosure, Figure 3 is a schematic diagram of the degassing pipeline of an anion eluent generation device shown in an embodiment of this disclosure. As Figure 1 and Figure 3 shown, the device includes: a tank body 2, an upper cover 4, a lower cover 6, and a degassing pipeline. A liquid injection pipe 1 and an air outlet 3 are arranged above the tank body 2. The liquid outlet end of the liquid injection pipe 1 is closely attached to the inner wall of the tank body 2. The direction of the air outlet 3 is obliquely downward, which can effectively reduce the splashing of liquid and the mixing of impurities during liquid injection. In a possible implementation manner, the diameter of the liquid injection pipe 1 is much smaller than the diameter of the air outlet 3, which can effectively prevent the phenomenon of liquid injection backflow caused by insufficient exhaust volume during liquid injection.

[0028] The upper cover 4 is provided with a through hollow structure along the axial direction. The tank opening at the bottom end of the tank body 2 is threadedly connected to the upper opening of the hollow structure of the upper cover 4. The anode plate 5 is located inside the hollow structure of the upper cover 4 and is connected to an external power supply system through an anode interface 9.

[0029] In a possible implementation manner, the anode plate is a mesh structure, thereby increasing the contact area between the anode plate and the liquid and helping the gas to quickly overflow to prevent bubble accumulation, improving the electrolysis efficiency and effect.

[0030] The lower end of the hollow structure of the upper cover 4 has an extended part protruding axially downward. There is also a first protrusion 41 circumferentially on the open end face at the bottom of the extended part. The upper end of the lower cover 6 is axially provided with a groove, and the bottom surface of the groove has a second protrusion protruding axially upward. Both the first protrusion 41 and the second protrusion are annular structures. The first protrusion 41 presses the cation exchange membrane 7 tightly against the upper end face of the second protrusion. A cathode plate 8 is arranged at the bottom end inside the second protrusion. The cathode plate 8 is connected to an external power supply system through a cathode interface 10. There are also a liquid injection port 11 and a liquid outflow port on the lower cover 6. The liquid outflow port and the liquid injection port 11 are on the same horizontal line.

[0031] Refer to Figures 1 to 3 , the liquid to be treated is injected from the liquid injection pipe 1 into the tank body 2, makes full contact with the anode plate 5, and is stored above the cation exchange membrane 7. Pure water enters the area between the cation exchange membrane 7 and the cathode plate 8 in the lower cover 6 from the liquid injection port 11, receives the cations passing through the cation exchange membrane 7, and forms a leaching solution with a set concentration and flows out from the liquid outflow port to the liquid degassing pipeline.

[0032] As Figure 3 shown, the degassing pipeline includes a liquid pipe 21. There is a spiral diversion groove inside the liquid pipe 21. A plurality of openings 22 are opened in the liquid pipe 21. Inert gas is slowly injected into the liquid pipe 21 from each opening 22. The leaching solution will rotate along with the spiral diversion pipe inside the liquid pipe 21 and is fully mixed with the mixed inert gas at the same time. The degassing pipe 24 is connected to the liquid pipe 21. The vacuum box is sleeved outside the outer pipe of the degassing pipe 24; the material of the degassing pipe 24 can permeate air and block water. When the leaching solution flows through the degassing pipe 24, the gas in the leaching solution is efficiently extracted by the negative pressure formed by the vacuum box 23.

[0033] As an example of this embodiment, when the leaching solution flows stably in the pipe under a certain pressure difference or pumping power, due to the interaction between the liquid and the spiral diversion groove, the liquid will start to rotate along the path set by the spiral diversion groove. At the same time, the inert gas is continuously injected into the liquid pipe through a plurality of openings on the liquid pipe. In this process, due to the low solubility characteristics of the inert gas itself, when it is in full contact with the rotating liquid, it will not be largely dissolved in the liquid. On the contrary, with the rotation of the liquid, the inert gas forms numerous tiny bubbles in the liquid. Under the strong agitation of the liquid and the action of the spiral flow field, the inert gas bubbles quickly carry out mass exchange and mixing with other gases originally mixed in the liquid, enabling other gases originally dissolved or mixed in the liquid to diffuse more efficiently into the inert gas bubbles.

[0034] Afterwards, the water flow carrying inert gas bubbles will flow through the degassing pipe. The degassing pipe is placed in a vacuum chamber and is made of a gas-permeable and water-blocking material. The inert gas will carry the mixed other gases and be extracted from the degassing pipe under negative pressure, thus achieving the purpose of efficient degassing. Compared with directly introducing the liquid dissolved with impurity gases into the degassing pipe for degassing in the prior art, the present invention adds a process of filling with inert gas and fully mixing. Most of the impurity gases will be carried out during the stage of mixing with the inert gas and fully mixing, reducing the subsequent degassing pressure and workload, significantly improving the degassing efficiency and quality, and being able to adapt to the degassing treatment of liquids with large flow rates and high flow velocities.

[0035] In a possible implementation manner, a heater is also installed on the outer wall of the liquid pipe 21, and the heating temperature is 10 °C, which can promote the degassing of the eluent.

[0036] In a possible implementation manner, the spiral angle of the spiral guiding groove in the liquid pipe is 15°, and the depth of the guiding groove is 0.1 times the diameter of the liquid pipe. The depth and angle of the guiding groove determine the rotation state of the liquid in the pipe. The liquid to be processed in the present disclosure is a low-viscosity and high-flow-velocity liquid. Therefore, a smaller spiral angle and a larger groove depth are selected to prevent the liquid from forming a high-speed direct-flow column in the pipe, ensure that the fluid can rotate along with the guiding groove in the pipeline, and enable the fluid to fully contact and mix with the inert gas during rotation.

[0037] In a possible implementation manner, the inert gas is one of helium, neon, and argon. Large-scale production technologies and processes for these three gases are already available in the country, and their solubility in liquids is relatively low.

[0038] The embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technologies in the market, or to enable other ordinary technical personnel in the technical field to understand the disclosed embodiments herein.

Claims

1. An anion eluent generating device, characterized in that, The device includes: a tank body, an upper cover, a lower cover, and a degassing pipeline. A liquid injection pipe and an air outlet are provided above the tank body; The upper cover is provided with a through hollow structure along the axial direction. The tank opening at the bottom end of the tank body is threadedly connected to the upper opening of the hollow structure of the upper cover. The anode plate is located inside the hollow structure of the upper cover and is connected to an external power supply system through an anode interface; The lower end of the hollow structure of the upper cover has an extended portion protruding downward along the axial direction. There is also a first protrusion circumferentially on the opening end face at the bottom end of the extended portion. The upper end of the lower cover is provided with a groove along the axial direction. The bottom surface of the groove has a second protrusion protruding upward along the axial direction. Both the first protrusion and the second protrusion are annular structures. The first protrusion presses the cation exchange membrane tightly against the upper end face of the second protrusion. A cathode plate is provided at the bottom end inside the second protrusion. The cathode plate is connected to an external power supply system through a cathode interface; The lower cover also has a liquid injection port and a liquid outlet. The liquid outlet and the liquid injection port are at the same horizontal line; The liquid to be treated is injected into the tank body from the liquid injection pipe, fully contacts the anode plate, and is stored above the cation exchange membrane. Pure water enters the area between the cation exchange membrane and the cathode plate in the lower cover from the liquid injection port, receives the cations passing through the cation exchange membrane, and forms a leaching solution with a set concentration and flows to the liquid degassing pipeline for degassing treatment.

2. The device according to claim 1, wherein The degassing pipeline includes a liquid pipe. There is a spiral guide groove inside the liquid pipe. A plurality of openings are provided in the liquid pipe. Inert gas is injected into the liquid pipe from each opening. The leaching solution will rotate along with the spiral guide pipe inside the liquid pipe and is fully mixed with the mixed inert gas at the same time. The degassing pipe is connected to the liquid pipe. The vacuum box is sleeved outside the degassing pipe; The material of the degassing pipe can permeate air and block water. When the leaching solution flows through the degassing pipe, the gas in the leaching solution is extracted by the negative pressure formed by the vacuum box.

3. The device according to claim 1, characterized in that, A heater is also installed on the outer wall of the liquid pipe.

4. The device according to claim 3, characterized in that, The heating temperature of the heater is not higher than 10°C.

5. The device according to claim 1, characterized in that, The spiral angle of the spiral guide groove inside the liquid pipe is 15°.

6. The device according to claim 1, characterized in that, The depth of the guide groove is 0.1 times the diameter of the liquid pipe.

7. The device according to claim 2, characterized in that The inert gas is any one of helium, neon, and argon.

8. The device according to claim 1, characterized in that, The liquid outlet end of the liquid injection pipe is closely attached to the inner wall of the tank body.

9. The device according to claim 1, characterized in that The direction of the air outlet is obliquely downward.

10. The device according to claim 1, characterized in that, The diameter of the liquid injection pipe is not greater than 0.1 times the diameter of the air outlet.

Images