A coolant impurity collection and purification device for liquid metal pool reactor

Abstract

The present invention relates to the field of purification of coolant for liquid metal pool reactors, and in particular to a device for collecting and purifying coolant impurities for liquid metal pool reactors. The device for collecting and purifying coolant impurities for liquid metal pool reactors of the present invention comprises a collector and an impurity filter arranged in a reactor body container, wherein the collector is used to collect impurities on the liquid surface in the reactor body container and input the impurities into the impurity filter. Advantages: The structure is reasonably designed, and impurities are removed by circulating filtration, which improves the disadvantages of difficulty in cleaning impurities inside the container and difficulty in cleaning the container, and effectively improves the purification efficiency.

Description

Technical Field

[0001] The invention relates to the field of liquid metal pool reactor coolant purification, and in particular to a coolant impurity collection and purification device for liquid metal pool reactors. Background Art

[0002] Liquid metal coolant is the mainstream coolant for future fourth-generation nuclear reactors due to its good neutron properties, excellent thermal conductivity, and low neutron irradiation loss. However, due to the chemical activity of liquid metal, it is easily oxidized to form metal oxide impurity particles during the production process and reactor operation. The long-term accumulation of impurities will cause the coolant's thermal conductivity to decrease, and even block the pipeline, causing a core melt accident. Therefore, liquid metal needs to be purified before and during use. The existing purification method is to clean impurities in the container, which is easy to accumulate residues inside the container and is difficult to clean. At the same time, the internal cleaning efficiency is low. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a coolant impurity collection and purification device for a liquid metal pool reactor, which effectively overcomes the defects of the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] A coolant impurity collection and purification device for a liquid metal pool reactor comprises a collector and an impurity filter arranged in a reactor body container. The collector is used to collect impurities on the liquid surface in the reactor body container and input them into the impurity filter.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the liquid outlet of the collector is connected to the reactor body container through a circulation pipeline, and the impurity filter is connected to the circulation pipeline.

[0008] Furthermore, the above-mentioned circulation pipeline is connected to a liquid circulation power device.

[0009] Furthermore, it also includes a driving device arranged in the above-mentioned reactor body container, the above-mentioned collector is connected to the above-mentioned driving device through a circulation pipeline, and the above-mentioned driving device is used to transport coolant into the above-mentioned reactor body container and drive impurities at the liquid surface to flow to the above-mentioned collector.

[0010] Furthermore, the above-mentioned conveyor is a cavity structure, and a liquid outlet slit is provided on the side close to the above-mentioned structure.

[0011] Furthermore, the collector comprises an overflow weir with an open top, and an outlet is provided at the bottom of the overflow weir, and the outlet is connected to the circulation pipeline.

[0012] Furthermore, the height of the side wall of the overflow weir on one side close to the drive device is lower than the height of the side wall on the other side.

[0013] Furthermore, the overflow weir includes an inner baffle and an outer baffle, the outer baffle is a vertically arranged arc-shaped plate, the inner baffle is vertically arranged in the arc opening of the outer baffle and is close to the conveyor, the lower end of the inner baffle is rotatably connected to the lower end of the outer baffle, and the outlet is formed between the lower ends of the two, the longitudinal section of the inner baffle is an upwardly convex arc, and the inner baffle can swing up and down relative to the outer baffle.

[0014] Furthermore, the cross-sectional area of ​​the overflow weir gradually decreases from top to bottom.

[0015] Furthermore, it also includes a cooling device, which is arranged on the circulation pipeline and located between the collector and the impurity filter.

[0016] The beneficial effects of the present invention are: reasonable structural design, using a circulating filtration method to remove impurities, improving the disadvantages of difficulty in cleaning impurities inside the container and the difficulty in cleaning the container, and effectively improving the purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a device for collecting and purifying coolant impurities for a liquid metal pool reactor of the present invention;

[0018] Figure 2 for Figure 1 Schematic diagram of the cross section of the AA surface;

[0019] Figure 3 It is a partial structural schematic diagram of a longitudinal section of a collector in the coolant impurity collection and purification device for a liquid metal pool reactor of the present invention;

[0020] Figure 4 It is a longitudinal cross-sectional structural diagram of a coolant impurity collection and purification device for a liquid metal pool reactor according to the present invention.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Reactor body container; 2. Collector; 3. Impurity filter; 4. Circulation pipeline; 5. Liquid circulation power unit; 6. Drive and conveyor; 7. Cooling equipment; 8. Heating system; 21. Overflow weir; 22. Outlet; 61. Liquid outlet slit; 211. Inner baffle; 212. Outer baffle. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] Example: Figure 1 and 4 As shown, the coolant impurity collection and purification device for the liquid metal pool reactor of this embodiment includes a collector 2 and an impurity filter 3 arranged in the reactor body container 1. The collector 2 is used to collect impurities on the liquid surface in the reactor body container 1 and input them into the impurity filter 3.

[0025] In this embodiment, impurities in the reactor body container 1 float on the liquid surface (lead-bismuth solution is easily oxidized to form granular non-oxidizable oxides, the oxide density is relatively light, and it floats on the liquid surface), the collector 2 collects the impurities, and after collection, they are sent to the impurity filter 3 for filtration. After filtration, the liquid is transported back to the reactor body container 1. The structure of the entire device is reasonably designed, and a circulating filtration method is used to remove impurities (external circulation), which improves the difficulty of cleaning impurities inside the container and the disadvantages of the container being difficult to clean, and effectively improves the purification efficiency.

[0026] In this embodiment, the impurity filter 3 preferably adopts a precision filter in the prior art. Specifically, its structure includes a filter cavity and a metal filter mesh arranged in the filter cavity.

[0027] As a preferred embodiment, the liquid outlet of the collector 2 is connected to the reactor body container 1 through a circulation pipeline 4 , and the impurity filter 3 is connected to the circulation pipeline 4 .

[0028] In the above embodiment, by designing the circulation pipeline 4, the liquid containing impurities can flow back to the inside of the reactor body container 1 along the circulation pipeline 4 after passing through the impurity collector 2-impurity filter 3. The overall pipeline layout is good, which is conducive to the good circulation flow of the liquid.

[0029] As a preferred embodiment, the circulation pipeline 4 is connected to a liquid circulation power device 5 .

[0030] In the above-mentioned embodiment, the liquid circulation power device 5 provides power for the flow of liquid inside the circulation pipeline 4, promotes good circulation of the liquid, and performs efficient circulation flow impurity removal operations.

[0031] In this embodiment, the liquid circulation power device 5 can be a pneumatic pump of the prior art, and its specific model can be reasonably selected according to actual use requirements.

[0032] As a preferred embodiment, it also includes a driving device 6 arranged in the above-mentioned reactor body container 1. The above-mentioned collector 2 is connected to the above-mentioned driving device 6 through a circulation pipeline 4. The above-mentioned driving device 6 is used to promote the reflux of liquid into the above-mentioned reactor body container 1 and drive impurities at the liquid surface to flow toward the above-mentioned collector 2.

[0033] In the above embodiment, the design of the drive device 6 enables the filtered liquid entering through the circulation pipeline 4 to flow in the correct direction inside the reactor body container 1, prompting the liquid level inside the reactor body container 1 to flow toward the direction of the collector 2, that is, driving the impurities on the liquid surface to flow toward the collector 2, and the impurity capture is more efficient.

[0034] As a preferred embodiment, the driving device 6 is arranged on one side of the liquid surface of the reactor body container 1 , and the collector 2 is arranged on the other side of the liquid surface of the reactor body container 1 .

[0035] In the above-mentioned embodiment, the positions of the conveyor 6 and the collector 2 in the reactor body container 1 are very reasonably arranged, distributed on both sides of the reactor body container 1, so that the reflux liquid can flow from one side to the other side during operation, thereby promoting the impurities to flow well to the collector 2, thereby promoting the efficiency of the entire treatment process.

[0036] As a preferred embodiment, Figure 1 As shown, the collector 2 comprises an overflow weir 21 with an open top, and an outlet 22 is provided at the bottom of the overflow weir 21 , and the outlet 22 is connected to the circulation pipeline 4 .

[0037] In the above embodiment, the collector 2 is reasonably designed and is easy for liquid to enter.

[0038] As a preferred embodiment, the height of the side wall of the overflow weir 21 on one side close to the drive and conveyor 6 is lower than the height of the side wall on the other side.

[0039] In the above embodiment, the height difference design on both sides of the overflow weir 21 can prevent impurities from overflowing from the other side when they enter.

[0040] It should be additionally explained that the upper inlet of the overflow weir 21 should be slightly higher than the liquid level so as to reduce the amount of liquid entering when receiving the surge formed by impurities.

[0041] As a preferred embodiment, Figure 3 and 4As shown, the overflow weir 21 includes an inner baffle plate 211 and an outer baffle plate 212. The outer baffle plate 212 is a vertically arranged arc-shaped plate. The inner baffle plate 211 is vertically arranged in the arc opening of the outer baffle plate 212 and is close to the drive conveyor 6. The lower end of the inner baffle plate 211 is rotatably connected to the lower end of the outer baffle plate 212, and the outlet 22 is formed between the lower ends of the two. The longitudinal section of the inner baffle plate 211 is an arc convex upward. The inner baffle plate 211 can swing up and down relative to the outer baffle plate 212. More specifically, the inner baffle plate 211 is flipped upward to the maximum extent until its two end edges are in contact with the side surface of the arc opening of the outer baffle plate 212, or flipped downward to a small gap between the two end edges and the surface of the outer baffle plate 212.

[0042] In the above embodiment, when in use, the overflow weir 21 is suspended at the liquid surface. When the liquid level changes, the inner baffle 211 can perform self-rotation fine-tuning according to the height of the liquid level (since the bottom of the inner baffle 211 is suspended above the liquid surface, the inner baffle 211 will flip with the liquid surface when the liquid level changes), keeping its opening slightly higher than the liquid surface. The design of the curved lower surface of the inner baffle 211 can realize the adjustment capability of the overflow weir 21 within a height range of 10 cm.

[0043] It should be noted that: from a top view, the overflow weir 21 is a horizontally arranged curved arc (which can be designed as a crescent shape), and its arc mouth side is close to the above-mentioned conveyor 6. The overall arc-shaped structural design of the overflow weir 21 can increase the laying surface of impurities and reduce agglomeration, effectively preventing impurities from forming bridges to block the outlet 22 of the collector 2.

[0044] In this embodiment, the overflow weir 21 is in a necked form as a whole. Specifically, its cross-sectional area gradually decreases from top to bottom, which facilitates the liquid to flow toward the outlet 22 .

[0045] As a preferred embodiment, Figure 2 As shown, the driving device 6 is a cavity structure, and a liquid outlet slit 61 is provided on one side thereof close to the above-mentioned structure.

[0046] In the above embodiment, after the liquid refluxed through the circulation pipeline 4 enters the drive conveyor 6, it flows out in a planar shape through the liquid outlet slit 61 under the power provided by the liquid circulation power device 5, and flows to the collector 2, which is easy to capture impurities efficiently.

[0047] More specifically, the liquid outlet slit 61 is at the liquid surface. After the liquid entering the driving device 6 flows out through the liquid outlet slit 61 , a wave-like surge is formed at the liquid surface, thereby driving impurities on the liquid surface to surge toward the collector 2 .

[0048] Better, such as Figure 2As shown, the overall design of the driving device 6 is a horizontally arranged curved arc shape (can be designed as a crescent shape), and its longitudinal section is an unclosed circle, with its arc mouth side facing the collector 2, and the liquid outlet slit 61 extending along the arc length of the driving device 6, which makes the liquid form a large-scale surge after gushing out through the liquid outlet slit 61, so that most of the liquid surface of the reactor body container 1 can flow toward the collector 2. In addition, the curved arc structure design of the driving device 6 can also make the liquid entering it flow out through various parts of the liquid outlet slit 61 at a similar flow rate, and the driving effect is uniform, thereby preventing impurities in the body from agglomerating and clogging the purification system pipeline.

[0049] In this embodiment, both ends of the curved structure of the driving device 6 are almost close to the middle area of ​​the reactor body container 1, and the impurity surge formed by the driving device 6 almost covers the entire liquid surface of the reactor body container 1.

[0050] Of course, both ends of the curved structure of the overflow weir 21 are also close to the middle area of ​​the reactor body container 1, so that its surface for "receiving" impurities is wider and can almost "receive" impurities across the entire liquid surface.

[0051] As a preferred embodiment, a cooling device 7 is further included. The cooling device 7 is arranged on the circulation pipeline 4 and located between the collector 2 and the impurity filter 3 .

[0052] In the above embodiment, after the impurities enter the collector 2, the liquid is cooled before flowing through the impurity filter 3 through the circulation pipeline 4 for filtration. The cooling promotes more intolerant impurities to precipitate and precipitate from the lead-bismuth liquid, and more impurities can be filtered out in the subsequent filtration step, further improving the filtration effect and efficiency.

[0053] In this embodiment, the cooling device 7 can adopt a cold trap system of the prior art to quickly and effectively cool the "front section" of the circulation pipeline 4 to promote further precipitation of impurities.

[0054] Of course, a heating system 8 can be set up in the "rear section" of the circulation pipeline 4, that is, a section of the circulation pipeline 4 between the impurity filter 3 and the conveyor 6, to heat this section of the circulation pipeline 4 so that the temperature of the liquid rises when it flows to the reactor body container 1, so that the coolant will not solidify in the pipeline due to cooling, thereby ensuring good circulation of the coolant.

[0055] The above-mentioned heating system 8 can adopt the electric heating system of the prior art.

[0056] The liquid metal coolant purification system of this embodiment is suitable for purifying liquid lead-based heavy metal coolant of lead-based pool-type nuclear reactors, and after optimization and improvement, it can also be applied to sodium metal reactors and molten salt reactor systems.

[0057] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A coolant impurity collection and purification device for a liquid metal pool reactor, characterized in that: The invention comprises a collector (2) and an impurity filter (3) arranged in a reactor body container (1); the collector (2) comprises an overflow weir (21) with an open top, and an outlet (22) is provided at the bottom of the overflow weir (21); the overflow weir (21) comprises an inner baffle (211) and an outer baffle (212); the outer baffle (212) is a vertically arranged arc-shaped plate; the inner baffle (211) is vertically arranged in the arc opening of the outer baffle (212); the lower end of the inner baffle (211) is rotatably connected to the lower end of the outer baffle (212), and the lower ends of the inner baffle (211) and the outer baffle (212) are connected to each other. The outlet (22) is formed between the inner baffle plate (211) and the outer baffle plate (212). The inner baffle plate (211) can swing up and down relative to the outer baffle plate (212). The outlet (22) is connected to the reactor body container (1) via a circulation pipeline (4). The impurity filter (3) is connected to the circulation pipeline (4). The collector (2) is used to collect impurities on the liquid surface of the reactor body container (1) and input them into the impurity filter (3). The overflow weir (21) is suspended at the liquid surface. When the liquid surface changes, the inner baffle plate (211) performs fine rotation adjustment according to the height of the liquid surface.

2. The device for collecting and purifying coolant impurities for a liquid metal pool reactor according to claim 1, characterized in that: The circulation pipeline (4) is connected to a liquid circulation power device (5).

3. The device for collecting and purifying coolant impurities for a liquid metal pool reactor according to claim 2, characterized in that: It also includes a driving device (6) disposed in the reactor body container (1), the collector (2) being connected to the driving device (6) via a circulation pipeline (4), the driving device (6) being used to transport coolant into the reactor body container (1) and drive impurities at the liquid surface to flow toward the collector (2).

4. The device for collecting and purifying coolant impurities for a liquid metal pool reactor according to claim 3, characterized in that: The driving device (6) is a cavity structure, and a liquid outlet slit (61) is provided on a side thereof close to the collector (2).

5. The device for collecting and purifying coolant impurities for a liquid metal pool reactor according to claim 3, characterized in that: The height of the side wall of the overflow weir (21) on one side close to the driving device (6) is lower than the height of the side wall on the other side.

6. The device for collecting and purifying coolant impurities for a liquid metal pool reactor according to claim 5, characterized in that: The inner baffle plate (211) is close to the driving device (6), and the longitudinal section of the inner baffle plate (211) is an arc shape that bulges upward.

7. The device for collecting and purifying coolant impurities for a liquid metal pool reactor according to claim 6, characterized in that: The cross-sectional area of ​​the overflow weir (21) gradually decreases from top to bottom.

8. A device for collecting and purifying coolant impurities for a liquid metal pool reactor according to any one of claims 1 to 7, characterized in that: It also includes a cooling device (7), wherein the cooling device (7) is arranged on the circulation pipeline (4) and is located between the collector (2) and the impurity filter (3).

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