Oxygen control module, reactor primary circuit liquid metal delivery system, and liquid metal oxygen control method

Abstract

The present application relates to a kind of oxygen control module, reactor primary circuit liquid metal conveying system and liquid metal oxygen control method, oxygen control module includes at least one oxygen control unit, at least one gas injection unit and control unit;At least one oxygen control unit includes nozzle and electric control component;Nozzle is provided with multiple through holes in spaced arrangement, for injecting oxygen control gas in the form of dispersed bubble into liquid metal;Electric control component includes oxygen sensor and flow controller;Oxygen sensor is used to collect dissolved oxygen concentration in liquid metal;Flow controller is used to control the gas flow at nozzle;At least one gas injection unit, the nozzle of at least one oxygen control unit is communicated, for storing and delivering oxygen control gas to nozzle;Control unit is electrically connected with at least one gas injection unit, at least one oxygen control unit respectively.The present application can improve the spatial distribution uniformity of oxygen control degree, improve the oxygen control effect while ensuring the stability of operation.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and more specifically, to an oxygen control module, a liquid metal transport system for the reactor primary loop, and a liquid metal oxygen control method. Background Technology

[0002] For reactors using liquid metal as the primary coolant, the liquid metal can corrode the reactor's structural materials. Active oxygen control technology is the mainstream method to suppress corrosion. It involves injecting oxygen or a hydrogen-oxygen mixture into the primary liquid metal, and dynamically adjusting the concentration of dissolved oxygen in the liquid metal through mass transfer and chemical reactions at the gas-liquid interface. This maintains the concentration within a range that allows for the formation of a protective oxide film without causing excessive oxide deposition.

[0003] Currently, active oxygen control technology is typically implemented using the immersion bubbling method, which involves injecting oxygen control gas through a nozzle immersed in liquid metal via bubbling. The efficiency and stability of the bubbling method are significantly affected by the size and distribution of the bubbles. Currently, the nozzles used in the bubbling method usually have a single, large-diameter outlet, resulting in a small gas-liquid surface area and a tendency to cause violent fluctuations and splashing of the liquid metal, leading to poor operational stability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an oxygen control module, a liquid metal transport system for the reactor primary loop, and a liquid metal oxygen control method, in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by this invention to solve its technical problem is: constructing an oxygen control module, comprising: At least one oxygen control unit includes a nozzle and an electronic control assembly; the nozzle is provided with a plurality of through holes arranged at intervals for injecting oxygen control gas into liquid metal in a dispersed bubbling form; the electronic control assembly includes an oxygen sensor and a flow controller; the oxygen sensor is used to collect the dissolved oxygen concentration in the liquid metal; the flow controller is used to control the gas flow rate at the nozzle; At least one gas injection unit, connected to the nozzle of the at least one oxygen control unit, is used to store and supply oxygen control gas to the nozzle; and The control unit is electrically connected to the at least one gas injection unit and the at least one oxygen control unit, respectively.

[0006] Furthermore, the diameter of the through hole is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0007] Furthermore, the nozzle is provided with at least two sets of through holes spaced apart along the nozzle axial direction; each set of through holes includes at least two through holes, and the at least two through holes in each set of through holes are evenly spaced apart along the circumference of the nozzle.

[0008] Furthermore, the number of through-hole groups is greater than or equal to 3 and less than or equal to 10; and / or The number of through holes in each through hole group is greater than or equal to 3 and less than or equal to 8.

[0009] Furthermore, the spacing between two adjacent through-hole groups is greater than or equal to 1 mm and less than or equal to 6 mm.

[0010] Furthermore, the spacing between two adjacent through-hole groups is greater than the diameter of the through-hole.

[0011] Furthermore, the nozzle is a tube closed at one end, and the plurality of through holes are disposed on the side wall of the nozzle.

[0012] Furthermore, the nozzle has a diameter greater than or equal to 4 mm and less than or equal to 12 mm.

[0013] Furthermore, the electronic control component also includes a valve, which is disposed in the pipeline connecting the gas injection unit and the nozzle, for controlling the airflow to be injected into the nozzle, and the valve is electrically connected to the control unit.

[0014] Furthermore, the valve is connected in parallel with the flow controller and is connected to the gas injection unit and the nozzle, respectively.

[0015] Furthermore, the electronic control component also includes a differential pressure transmitter for acquiring the pressure difference between the stabilization point and the nozzle inlet; the control unit is configured to control the valve to cause the nozzle to spray airflow when the signal acquired by the differential pressure transmitter exceeds a threshold.

[0016] Furthermore, the oxygen control module includes at least two oxygen control units, which are respectively installed in different areas of the delivery pipeline of the reactor primary loop liquid metal delivery system. The at least two oxygen control units are electrically connected to the control unit and are respectively connected to the at least one gas injection unit.

[0017] Furthermore, the electronic control component also includes a temperature sensor for acquiring the temperature of the liquid metal, the temperature sensor being electrically connected to the control unit.

[0018] A reactor primary loop liquid metal transport system is constructed, comprising a transport pipeline for transporting liquid metal and an oxygen control module as described in any of the preceding claims.

[0019] Furthermore, the oxygen control module includes at least two oxygen control units, which are respectively located in different areas of the delivery pipeline and are electrically connected to the control unit; the control unit is configured to control the at least two oxygen control units to balance the dissolved oxygen concentration in the liquid metal in different areas.

[0020] A liquid metal oxygen control method is constructed and applied to the liquid metal transport system of the reactor primary loop as described in any of the preceding claims, wherein the liquid metal oxygen control method includes: Collect the state parameters of the liquid metal in the delivery pipeline; Based on the target oxygen concentration and the state parameters, the initial output flow rate of the oxygen control unit is obtained; The oxygen control unit is controlled to output oxygen control gas at the initial output flow rate.

[0021] Furthermore, the oxygen control module includes at least two oxygen control units, which are respectively located in different areas of the delivery pipeline and are electrically connected to the control unit. The liquid metal oxygen control method includes: Collect state parameters of the liquid metal at different regions of the delivery pipeline; Based on the target oxygen concentration, the state parameters of each region, and the flow field model of the delivery pipeline, the initial output flow rate of the oxygen control unit corresponding to each region and the crosstalk arrival time between each region are obtained. The oxygen control unit in each region outputs oxygen control gas at the initial output flow rate; Based on the crosstalk arrival time, the output flow rate of the oxygen control unit in the target area is compensated and adjusted before the predicted crosstalk effect reaches the target area.

[0022] Furthermore, the state parameters include dissolved oxygen concentration and temperature.

[0023] Further, the step of adjusting the output flow rate of the oxygen control unit in the target area according to the crosstalk arrival time, before the predicted crosstalk effect reaches the target area, includes: Based on the time required for gas to diffuse from one region to the target region, the output flow rate of the oxygen control unit in the target region is adjusted and compensated for before crosstalk reaches the target region by a preset time.

[0024] Further, the compensation adjustment of the output flow rate of the oxygen control unit in the target area includes: Reduce the output flow rate of the oxygen control unit in the target area by a preset ratio.

[0025] Furthermore, the preset ratio is greater than or equal to 1% and less than or equal to 10%; and / or The preset time is greater than or equal to 3 seconds and less than or equal to 15 seconds.

[0026] Furthermore, the electronic control assembly also includes a valve and a differential pressure transmitter. The valve is used to control the gas injection into the nozzle, and the differential pressure transmitter is used to collect the pressure difference between the stabilizing point and the nozzle inlet. The liquid metal oxygen control method further includes: Monitor the differential pressure signal acquired by the differential pressure transmitter; When the differential pressure signal meets the preset conditions, the valve is controlled to spray gas into the nozzle orifice at least once to clear the blockage.

[0027] Furthermore, before controlling the oxygen control unit to output oxygen control gas at the initial output flow rate, the liquid metal oxygen control method further includes: The oxygen control unit is controlled to output at least three different flow rates in sequence, and the pressure difference values ​​corresponding to the at least three different flow rates are collected to obtain the flow rate-pressure difference characteristic curve. The preset conditions include that the abnormality rate of the differential pressure signal relative to the differential pressure value at the corresponding point on the flow-differential pressure characteristic curve exceeds a threshold.

[0028] Furthermore, the preset conditions include that the abnormality rate of the differential pressure signal relative to the differential pressure value at the corresponding point of the flow-differential pressure characteristic curve exceeds a threshold and continues for a preset duration.

[0029] Further, the threshold is greater than or equal to 10% and less than or equal to 35%; and / or The preset duration is greater than or equal to 10 minutes and less than or equal to 45 minutes.

[0030] The technical solution constructed by implementing the present invention has at least the following beneficial effects: This invention utilizes a nozzle with multiple through-holes, each of which can serve as an independent, relatively small-diameter outlet. Compared to a nozzle with a single outlet, this allows for the generation of a greater number of smaller bubbles at the same gas flow rate. This results in a larger gas-liquid surface area, improving the uniformity of oxygen control spatial distribution and consequently enhancing mass transfer efficiency and uniformity. Furthermore, it mitigates liquid metal fluctuations and splashing during bubbling, improving oxygen control while ensuring operational stability. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1This is a schematic diagram of the liquid metal transport system in the reactor primary loop according to one embodiment of the present invention; Figure 2 yes Figure 1 A cross-sectional view of the delivery pipeline and a schematic diagram of the oxygen control module installed on it; Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of the nozzle in the diagram; Figure 4 This is a comparison chart of the oxygen control effects of nozzles with different through-hole diameters in the same liquid metal environment; Figure 5 This is a schematic diagram of the structure of a liquid metal oxygen control method according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a liquid metal oxygen control method in another embodiment of the present invention. Detailed Implementation

[0032] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments are now described in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the invention. However, the invention can be practiced in many ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] like Figures 1 to 3 As shown, the present invention constructs an oxygen control module 10 and a reactor primary loop liquid metal transport system having the oxygen control module 10. The reactor primary loop liquid metal transport system may further include a transport pipeline 20 for transporting liquid metal 3. The oxygen control module 10 is disposed on the transport pipeline 20 for controlling the dissolved oxygen concentration in the liquid metal 3.

[0038] Specifically, the oxygen control module 10 may include a control unit 13, at least one oxygen control unit 11, and at least one gas injection unit 12. The control unit 13 is electrically connected to each oxygen control unit 11 and each gas injection unit 12, respectively, for controlling the oxygen control operation of the oxygen control module 10. The outlet end of the gas injection unit 12 is connected to the inlet end of at least one oxygen control unit 11, for supplying gas to the oxygen control unit 11. The oxygen control unit 11 is disposed on the delivery pipeline 20, and its nozzle 111 is at least partially immersed in the liquid metal 3 within the delivery pipeline 20 to output gas to the liquid metal 3, controlling the dissolved oxygen concentration in the liquid metal 3 through a bubbling method.

[0039] Specifically, the number of oxygen control units 11 can be set to at least two, which are distributed in different areas of the delivery pipeline 20 to adjust the dissolved oxygen concentration of liquid metal 3 in different areas respectively. The number of gas injection units 12 is one, and its outlet end is connected to the inlet end of each oxygen control unit 11 to deliver gas to each oxygen control unit 11. The control unit 13 can be configured to control the at least two oxygen control units 11 to balance the dissolved oxygen concentration in the liquid metal 2 in different areas.

[0040] For example in Figure 1 In the illustrated embodiment, the delivery pipeline 20 includes an inlet area 201, a middle section area 202, and an outlet area 203. Three oxygen control units 11 are respectively located in the inlet area 201, the middle section area 202, and the outlet area 203 to adjust the dissolved oxygen concentration of the liquid metal 3 in each of the three areas, achieving a relatively uniform distribution of dissolved oxygen concentration in each area. One gas injection unit 12 is provided, which can supply gas to the three oxygen control units 11. One control unit 13 is provided, which can control the operation of the electronic components within the gas injection unit 12 and the three oxygen control units 11.

[0041] It is important to understand that for relatively large reactor primary loop liquid metal transport systems, there are significant temperature gradients in different areas. These temperature gradients result in noticeable differences in the dissolved oxygen capacity of the liquid metal 3 in different areas, making it difficult for a single oxygen control unit to achieve uniform control of the dissolved oxygen concentration of the liquid metal 3 in all areas. Furthermore, the oxygen control gas output from a single oxygen control unit needs to circulate with the fluid to diffuse throughout the entire transport pipeline 20, which is time-consuming and results in a significant lag in oxygen control effectiveness.

[0042] This invention divides the delivery pipeline 20 into multiple distinct zones, each equipped with an oxygen control unit. The parameters of the oxygen control gas output by the oxygen control unit 11 can be specifically set based on the environmental conditions of the liquid metal 3 in that zone, thereby improving the uniformity of oxygen control effect across all zones. Simultaneously, separate oxygen control adjustments in each zone shorten the time required for the oxygen control gas to diffuse throughout the entire delivery pipeline 20, effectively mitigating the lag in oxygen control effect.

[0043] It should be noted that the regional division of the conveying pipeline 20 can be flexibly set based on factors such as the specific length of the conveying pipeline 20, the temperature of the liquid metal 3 at each location, the branch distribution, and the pipe size, and no specific limitation is made here.

[0044] It should be noted that this reactor primary loop liquid metal transport system can be applied to various fields such as nuclear power, industrial metallurgy, aerospace, and energy storage heat exchange, and is not specifically limited here. The transport pipeline 20 can also be configured as a closed loop or an open pipeline, depending on the specific field in which the reactor primary loop liquid metal transport system is applied; this is also not specifically limited here. For example, when this reactor primary loop liquid metal transport system is applied in the nuclear power field, the transport pipeline 20 can specifically be the primary loop in the reactor, etc.

[0045] In some other embodiments, the number of gas injection units 12 may be at least two, and each gas injection unit 12 may be configured in a one-to-one correspondence with an oxygen control unit 11, or each gas injection unit 12 may be configured in a corresponding manner with at least two oxygen control units 11.

[0046] like Figure 2 As shown, in some embodiments, the oxygen control unit 11 may include a nozzle 111, an electronic control assembly 112, a first gas supply branch 113, and a second gas supply branch 114. The nozzle 111 is immersed in the liquid metal 3 and has multiple through holes 1111 spaced apart to inject gas into the liquid metal 3 in a bubbling manner. The first gas supply branch 113 and the second gas supply branch 114 are connected in parallel, with their inlet ends connected to the outlet end of the gas injection unit 12 and their outlet ends connected to the inlet end of the nozzle 111. The electronic control assembly 112 is electrically connected to the control unit 13 and is used to control the oxygen control operation of the oxygen control unit 11 under the action of the control unit 13.

[0047] Specifically, the nozzle 111 is generally a tube with one end open and the other end closed, and its open end is connected to the outlet end of the first air supply branch 113 and the second air supply branch 114.

[0048] The electronic control assembly 112 may include an oxygen sensor 1121, a flow controller 1122, a valve 1123, a differential pressure transmitter 1124, and a temperature sensor 1125, all of which are electrically connected to the control unit 13. The oxygen sensor 1121 is immersed in the liquid metal 3 to collect the dissolved oxygen concentration within the liquid metal 3. The flow controller 1122 is located on the first gas supply branch 113 and is used to control the flow rate of oxygen-controlled gas when the nozzle 111 is normally outputting it. The valve 1123 is located on the second gas supply branch 114 and is used to achieve instantaneous high-speed gas injection to clear impurities clogging the through-hole 1111 of the nozzle 111. One end of the differential pressure transmitter 1124 is connected to the inlet end of the first gas supply branch 113, and the other end is connected to the inlet end of the nozzle 111, used to collect the pressure difference between the two. The temperature sensor 1125 is immersed in the liquid metal 3 and is used to collect the temperature of the liquid metal 3.

[0049] The control unit 13 can be configured to control the flow controller 1122 to adjust the flow rate of the oxygen control gas delivered to the nozzle 111 by the first gas supply branch 113 based on the dissolved oxygen concentration signal collected by the oxygen sensor 1121 and the temperature signal collected by the temperature sensor 1125.

[0050] The control unit 13 can also be configured to, when the differential pressure signal collected by the differential pressure transmitter 1124 exceeds the threshold, control the flow controller 1122 to cut off the passage of the first gas supply branch 113 and control the valve 1123 to open, so that the high-pressure inert gas rushes to the nozzle 111 at a high flow rate through the second gas supply branch 114, so that the nozzle 111 can clear the impurities blocking the through hole 1111 by spraying the inert gas at a high speed.

[0051] It is important to understand that current liquid metal oxygen control modules using the bubbling method typically employ a tubular nozzle with two open ends. One end of this tubular structure is connected to the gas injection unit, while the other end serves as the nozzle's outlet. This configuration results in a relatively large nozzle outlet diameter, leading to a smaller gas-liquid surface area between the oxygen control gas and the liquid metal 3. This can easily cause uneven spatial distribution of oxygen concentration, resulting in poor mass transfer efficiency and uniformity.

[0052] The present invention provides a nozzle 111 with multiple through holes 1111, each of which can serve as an independent air outlet. Compared with a nozzle with a single air outlet, this invention can generate a relatively larger number of smaller individual bubbles under the same gas flow rate, thereby achieving a larger gas-liquid specific surface area, improving the uniformity of oxygen control spatial distribution, and thus improving mass transfer efficiency and uniformity.

[0053] It is important to understand that current oxygen control modules are unable to predict or address nozzle outlet blockage issues, and these blockages are often difficult to detect until they significantly affect oxygen control performance. This leads to a passive approach to maintenance and upkeep, ultimately impacting oxygen control effectiveness.

[0054] This invention, by incorporating a differential pressure transmitter 1124, can monitor the pressure difference between the inlet end of nozzle 111 and another relatively stable pressure position in real time. Furthermore, it can monitor the blockage status of the through-hole 1111 at nozzle 111 in real time by monitoring changes in the pressure difference. This allows for accurate identification of minor blockages in nozzle 111 that have not yet affected the overall oxygen control effect, avoiding the maintenance delays caused by the hidden nature of blockages in traditional oxygen control modules.

[0055] It should be noted that the relatively stable pressure point is defined as the pressure stabilization point, which can be flexibly selected. For example, in... Figure 2 In the illustrated embodiment, the inlet end of the first gas supply branch 113 is the pressure stabilization point. In other embodiments, the pressure stabilization point may also be a location within the delivery pipeline 20, or a location on the gas delivery pipeline 122 of the gas injection unit 12, or other locations with relatively stable pressure.

[0056] This invention, by incorporating valve 1123, utilizes its instantaneous high-flow-rate gas output capability to achieve instantaneous high-speed jet cleaning of nozzle 111. This eliminates the need for operators to stop the machine and disassemble nozzle 111 for unclogging, significantly reducing maintenance costs and the frequency of manual intervention. It overcomes the technical shortcomings of oxygen control effectiveness being easily affected by nozzle blockage and passive maintenance, effectively improving the continuity and controllability of oxygen control operations.

[0057] This invention achieves physical isolation between two operating modes by setting the flow controller 1122 and valve 1123 in parallel on different gas supply branches, thus avoiding mutual interference between their operations. The flow controller 1122 can provide a stable and precise oxygen control flow to the nozzle 111 through the first gas supply branch 113, ensuring the oxygen control effect. The valve 1123 can directly control the high-pressure gas source to be delivered to the nozzle 111 at high speed instantaneously through the second gas supply branch 114, so as to achieve high-speed jetting of the nozzle 111 to clear blockages. In this way, it can ensure that the flow controller 1122 can achieve precise control of gas flow, and avoid impact damage to the flow controller 1122 during valve 1123 operation, thereby improving the operational reliability and oxygen control stability of the oxygen control module 10.

[0058] It should be noted that the oxygen sensor 1121, flow controller 1122, valve 1123, differential pressure transmitter 1124, and temperature sensor 1125 can all be implemented using existing technologies. For example, the valve 1123 can be implemented using existing technologies such as a high-speed electromagnetic pulse valve or a pneumatic quick-cut valve. Similarly, the flow controller 1122 can be implemented using existing technologies such as a mass flow controller (MFC). Furthermore, the temperature sensor 1125 can be implemented using existing technologies such as a thermocouple. No specific limitations are made here.

[0059] Furthermore, the inlet and / or outlet ends of the first gas supply branch 113 and the second gas supply branch 114 can share a section of pipeline to save the total length of pipeline layout and reduce construction costs.

[0060] In some other embodiments, the oxygen control unit 11 may also include only a single gas supply branch, and the valve 1123 and the flow controller 1122 may be connected in series on the single gas supply branch.

[0061] In some other embodiments, the electronic control assembly 112 may not include the valve 1123 and / or the differential pressure transmitter 1124. For example, when the electronic control assembly 112 does not include the differential pressure transmitter 1124, the control unit 13 can be configured to control the valve 1123 to perform periodic operation or trigger-type pulse cleaning based on the operating time, differential pressure signal, or deviation of the flow-differential pressure characteristic curve, in order to preventively clean the through-hole 1111 periodically. When the electronic control assembly 112 does not include the valve 1123, field personnel can promptly know the blockage status of the through-hole 1111 based on the value output by the differential pressure transmitter 1124, and perform timely cleaning accordingly, avoiding maintenance delays.

[0062] In some embodiments, the diameter of the nozzle 111 may be greater than or equal to 4 mm and less than or equal to 12 mm. For example, its diameter may be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, or any other value within this range.

[0063] like Figure 3 As shown, in some embodiments, each through hole 1111 is disposed on the sidewall of the nozzle 111, and is divided into at least two through hole groups, each through hole group including at least two through holes 1111. Each through hole group is evenly spaced along the axial direction of the nozzle 111, and each through hole 1111 in each through hole group is evenly spaced along the circumferential direction of the nozzle 111.

[0064] Specifically, the number of through holes can be greater than or equal to 3 and less than or equal to 10. For example, the number of through holes can be 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0065] The axial spacing H between two adjacent through-hole groups can be greater than or equal to 1 mm and less than or equal to 6 mm. For example, the spacing H can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, or any other value within this area.

[0066] The number of through holes 1111 in each through hole group can be greater than or equal to 3 and less than or equal to 8. For example, the number of through holes 1111 in each through hole group can be 3, 4, 5, 6, 7, 8, etc.

[0067] For example in Figure 3 In the embodiment shown, the nozzle 111 is provided with four through hole groups along the axial direction, the axial distance between two adjacent through hole groups is 5 mm, and each through hole group includes four through holes 1111.

[0068] It is important to understand that a nozzle with only a single outlet can only output oxygen-controlled gas in one direction. Concentrated gas ejection creates a localized high-oxygen zone near the nozzle, while the oxygen concentration is insufficient further away, resulting in uneven oxygen control of the liquid metal 3 throughout the delivery pipeline.

[0069] The present invention provides a plurality of through holes 1111 evenly spaced in the axial and circumferential directions of the nozzle, which facilitates the uniform injection of oxygen control gas into the liquid metal 3 in a dispersed manner, thereby improving the uniformity of oxygen control and achieving a more stable and precise global oxygen control effect.

[0070] It should be noted that the through holes 1111 of two adjacent through hole groups can be set correspondingly or staggered along the circumference of the nozzle 111, and no specific limitation is made here.

[0071] Furthermore, the axial distance between two adjacent through-hole groups can be significantly larger than the aperture of through-hole 1111. This effectively prevents the bubbles output from adjacent through-holes 1111 from merging, thereby ensuring a large gas-liquid mass transfer specific surface area.

[0072] In other embodiments, the through holes 1111 on the sidewall of the nozzle 111 may be arranged in other ways, such as in a matrix, radial, or irregular pattern.

[0073] In some other embodiments, the through-hole groups may be non-uniformly spaced along the axial direction of the nozzle 111. The through holes 1111 of each through-hole group may also be non-uniformly spaced along the circumference of the nozzle 111.

[0074] In some other embodiments, at least some through holes 1111 may be spaced apart at the closed end of the nozzle 111.

[0075] like Figure 3 As shown, in some embodiments, the diameter d of the through hole 1111 can be greater than or equal to 0.05 mm and less than or equal to 0.5 mm. Specifically, the diameter can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, or any other value within this area.

[0076] It is important to understand that for nozzle structures that are tubular at both ends, the larger diameter of the outlet is prone to generating larger bubbles. During the bubbling process, the larger bubbles can cause violent fluctuations and splashing of the liquid metal 3. The resulting droplets are prone to sticking to the inner wall of the delivery pipeline, interfering with the stability of operation.

[0077] This application effectively reduces the gas-liquid specific surface area by decreasing the aperture of the through-hole 1111, while also mitigating the fluctuation and splashing of liquid metal 3 during bubbling, thus improving oxygen control and ensuring operational stability. Experiments show that when the diameter of the through-hole 1111 is reduced from 4.9 mm to 1.34 mm, the gas-liquid specific surface area increases by approximately 3.66 times, effectively improving the mass transfer efficiency at the gas-liquid interface.

[0078] As shown in Table 1, for nozzles 1111 with single through-holes 1111 of different apertures, when performing oxygen control operations into liquid metal 3 with the same parameters under the same conditions, the diameter of the output bubbles decreases as the diameter of the through-hole 1111 decreases, and the oxygen control effect gradually improves after the same time.

[0079] Table 1 See also Figure 4 Under the same operating conditions, oxygen control was performed using nozzles with different orifice diameters. Compared to using a nozzle with a 5mm orifice diameter, using nozzle 111 (0.1mm orifice diameter) resulted in a dissolved oxygen concentration of 1.03 × 10⁻⁶ within the liquid metal 3 after 48 hours of oxygen control. -4 mol / m 3 The oxygen control efficiency was improved by 408 times. Further analysis showed that the dissolved oxygen self-saturation concentration in liquid metal 3 was reduced to 4.20 × 10⁻⁶. -2 mol / m 3 The required time will be reduced by 1 / 4.

[0080] In other words, by controlling the aperture of the through hole 1111 on the nozzle 111, the present invention can effectively improve the working effect and response efficiency of oxygen control operations.

[0081] like Figure 1 and Figure 2 As shown, in some embodiments, the gas injection unit 12 may include a gas storage mechanism 121 and a gas delivery pipe 122. The gas storage mechanism 121 stores inert gas and oxygen control gas. The inlet end of the gas delivery pipe 122 is connected to the gas storage mechanism 121, and the outlet end is connected to a first gas supply branch 113 and a second gas supply branch 114 to deliver oxygen control gas and / or inert gas to the nozzle 111.

[0082] It should be noted that the gas storage mechanism can be implemented using existing technologies such as gas cylinders and gas storage devices, which will not be elaborated further here.

[0083] For example, when a gas storage mechanism uses gas cylinders to store gas, the gas storage mechanism may include multiple gas cylinders. Some gas cylinders may store inert gases such as high-pressure argon, which are used to generate a high-speed jet of gas driven by valve 1123 to clear the through hole 1111 of nozzle 111. The remaining gas cylinders may store oxygen control gases such as hydrogen and oxygen, which are used to output to the liquid metal 3 at a fixed rate through nozzle 111 under the drive of flow controller 1122.

[0084] It should be noted that gas cylinders storing oxygen control gases may also contain inert gases such as argon as carrier gases.

[0085] It should be noted that the gas delivery pipeline 122 may specifically include at least one pipeline. For example, when the gas delivery pipeline 122 includes only one pipeline, the two ends of the pipeline may be connected to the first gas supply branch 113 and the second gas supply branch 114 of each gas cylinder storing different gases and each oxygen control unit 11, respectively. For example... Figure 2 As shown, when the gas delivery pipeline 122 includes two pipelines, the two ends of one of them can be connected to the gas cylinders storing oxygen control gas and the first gas supply branch 113 of each oxygen control unit 11, and the two ends of the other pipeline can be connected to the gas cylinders storing high-pressure inert gas and the second gas supply branch 114 of each oxygen control unit 11. No specific limitations are made here.

[0086] The present invention, by separately setting a gas storage mechanism 121 for storing high-pressure inert gas, can spray only inert gas when the through hole 1111 of the nozzle 111 is blocked, thus avoiding the impact of the oxygen control effect on the oxygen control effect in the liquid metal 2 caused by the spraying of oxygen control gas.

[0087] like Figure 5 As shown, the present invention also constructs a liquid metal oxygen control method, which can be applied to the reactor primary loop liquid metal transport system in any of the foregoing embodiments. This liquid metal oxygen control method may include the following steps.

[0088] Step S1: Collect the state parameters of the liquid metal 3 in the delivery pipeline 20.

[0089] The state parameter may include the dissolved oxygen concentration and temperature of the liquid metal 3.

[0090] This step can be achieved by using an oxygen sensor 1121 and a temperature sensor 1125 immersed in liquid metal 3.

[0091] Step S2: Obtain the initial output flow rate of oxygen control unit 11 based on the target oxygen concentration and state parameters.

[0092] It should be noted that the initial output flow rate is obtained based on the dissolved oxygen concentration and state parameters, which can be calculated using existing methods and will not be elaborated further here.

[0093] It should be noted that the target oxygen concentration can be flexibly set based on the operational requirements of the reactor's primary loop liquid metal transport system, and no specific limitation is made here.

[0094] Step S3: Control the oxygen control unit 11 to output oxygen control gas at the initial output flow rate.

[0095] Specifically, this can be achieved by controlling the flow controller 1122 of the corresponding oxygen control unit 11 through the control unit 13.

[0096] In some embodiments, such as Figure 6 As shown, when the oxygen control module 10 includes at least two oxygen control units 11, step S1 of the liquid metal oxygen control method may include collecting the state parameters of the liquid metal 3 in different areas of the delivery pipeline 20.

[0097] Step S2 includes obtaining the initial output flow rate of the oxygen control unit 11 corresponding to each region and the crosstalk arrival time between each region based on the target oxygen concentration, the state parameters of each region, and the flow field model of the delivery pipeline 20.

[0098] Specifically, the initial output flow rate of the oxygen control unit in each region can be obtained first based on the target oxygen concentration, the dissolved oxygen concentration in each region, and the temperature. Then, based on the dissolved oxygen concentration in each region, the initial output flow rate of the oxygen control unit 11 in each region, the temperature of the liquid metal 3 in each region, and the flow field model of the delivery pipeline 20, the arrival time of crosstalk between regions can be obtained.

[0099] It should be noted that, based on the dissolved oxygen concentration in each region, the initial output flow rate of the oxygen control unit in each region, and the temperature of the liquid metal 3 in each region, information such as the diffusion path, diffusion time, and crosstalk effects between regions can be obtained. Specifically, this information can be obtained through existing technologies such as simulation and prediction using the flow field model of the constructed delivery pipeline 20, and will not be elaborated further here.

[0100] It should be noted that the arrival time of this crosstalk can be understood as the time required for gas to diffuse from one region to the target region. The target region can be understood as the area reached by the gas diffusion.

[0101] For example in Figure 1 In the illustrated embodiment, it is assumed that, based on a simulation experiment using a flow field model, the time predicted for the oxygen control gas supplied by the oxygen control unit 11 to the middle section 202 of the delivery pipeline 20 to diffuse to the outlet section 203 is 30 seconds. Therefore, the outlet section 203 can be considered the target area, and the 30 seconds required for the gas to diffuse from the middle section 202 to the outlet section 203 can be considered the crosstalk arrival time.

[0102] Step S3 may include controlling the oxygen control unit 11 of each region to output oxygen control gas at its respective initial output flow rate.

[0103] The liquid metal oxygen control method further includes step S4, which involves compensating and adjusting the output flow of the oxygen control unit 11 in the target area before the crosstalk effect reaches the target area, based on the crosstalk arrival time.

[0104] Specifically, before crosstalk reaches the target area, the flow controller 1122 of the oxygen control unit 11 corresponding to the target area can be controlled by the control unit 13 to perform feedforward adjustment of the oxygen control gas flow in the target area, so as to reduce the impact of gas from other areas diffusing into the target area on the oxygen control effect.

[0105] It is important to understand that the temperature gradient of the liquid metal 3 in the delivery pipeline 20 leads to significant differences in the oxygen solubility of the liquid metal 3 in different regions. This, in turn, drives the fluid to form complex natural convection and local circulation, resulting in uneven diffusion and delayed delivery of the oxygen control gas. Traditional single-point delivery methods for oxygen control gas are ill-suited to the non-uniform physical characteristics of the primary loop liquid metal delivery system in this type of reactor, making it difficult to achieve uniform and stable control of the oxygen concentration throughout the entire loop.

[0106] By setting step S2, the present invention can set the initial output flow rate of the oxygen control unit 11 in each region based on different original data in different regions, so as to ensure that the oxygen control gas delivered to each region is adapted to the liquid metal 3 at different temperatures in each region, thereby improving the uniformity of the oxygen control effect on the liquid metal 3 in each region.

[0107] By setting steps S2 and S4, this invention can identify and counteract concentration interference caused by gas flow in advance, eliminating the need to wait for oxygen concentration fluctuations to be detected before feedback adjustment. This feedforward compensation method effectively suppresses coupling crosstalk caused by simultaneous gas supply in multiple regions, avoids the long-term adjustment oscillation phenomenon that easily occurs in traditional oxygen control methods, and improves the stability and control accuracy of the system.

[0108] In other words, by combining zoned independent oxygen control with feedforward compensation to regulate flow, this invention effectively alleviates the problems of oxygen solubility differences caused by temperature gradients and oxygen diffusion and transmission lag caused by fluid flow, and achieves rapid, uniform and stable control of dissolved oxygen concentration of liquid metal 3 in the entire delivery pipeline 20.

[0109] Through experimental simulation, the liquid metal oxygen control method constructed in this invention, when applied to the liquid metal delivery system of the reactor primary loop constructed in this invention, can achieve a uniform distribution of the target oxygen concentration in the liquid metal 3 throughout the entire delivery pipeline 20 within 10 hours, without any overshoot or oscillation issues. In contrast, the oxygen control method in related technologies that uses single-point delivery of oxygen control gas takes more than 24 hours to achieve the same target oxygen concentration, and there is a ±15% deviation in dissolved oxygen concentration between different regions.

[0110] In some embodiments, step S4 may include adjusting the output flow rate of the oxygen control unit 11 in the target area by a preset time before crosstalk effects reach the target area, based on the time required for the gas to diffuse from one region to the target area.

[0111] Specifically, the preset time can be greater than or equal to 3s and less than or equal to 15s. For example, the preset time can be 4s, 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, or any other value within this range.

[0112] Furthermore, the compensation adjustment of the output flow rate of the oxygen control unit 11 in the target area in step S4 may include reducing the output flow rate of the oxygen control unit 11 in the target area by a preset ratio.

[0113] Specifically, the preset ratio can be greater than or equal to 1% and less than or equal to 10%. For example, the preset ratio can be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or any other value within this range.

[0114] For example in Figure 1 In the illustrated embodiment, the preset time is 5 seconds and the preset ratio is 5%. Assuming that based on steps S1 and S2, the initial output flow rate of the intermediate zone 202 is greater than the initial output flow rate of the outlet zone 203, and the time for the oxygen control gas delivered in the intermediate zone 202 to diffuse to the outlet zone 203 is 30 seconds, then in step S4, at the 25th second when the oxygen control unit 11 in the intermediate zone 202 delivers oxygen control gas to the liquid metal 3 in that zone at its initial output flow rate, the control unit 13 can control the initial output flow rate of the oxygen control unit 11 in the outlet zone 203 to decrease by 5% to offset the interference caused by the oxygen control gas in the intermediate zone 202 diffusing to the outlet zone 203 after 30 seconds.

[0115] like Figure 5 and Figure 6 As shown, in some embodiments, the liquid metal oxygen control method further includes the following steps.

[0116] Step S5: Monitor the differential pressure signal collected by the differential pressure transmitter 1124.

[0117] It should be noted that step S5 can be applied throughout the entire operation of the oxygen control unit 11, that is, throughout steps S3 and S4.

[0118] Step S6: When the differential pressure signal meets the preset conditions, control valve 1123 causes gas to be injected into the through hole 1111 of nozzle 111 at least once to clear the blockage.

[0119] Specifically, targeting Figure 2 The embodiment shown, in which the control valve 1123 causes the gas to be ejected through the through-hole 1111 of the nozzle 111 at least once, may include: Turn off flow controller 1122.

[0120] The control valve 1123 is opened, causing the gas to be injected into the through hole 1111 of the nozzle 111 at least once.

[0121] Control valve 1123 is closed and flow controller 1122 is turned on, so that the flow rate of the first gas supply branch 113 returns to the target flow rate.

[0122] It should be noted that the valve 1123 causes the gas to be injected into the through hole 1111 of the nozzle 111 at least once. Specifically, it can be understood that the valve 1123 is opened instantaneously under the control of the control unit 13, so that the high-pressure inert gas is injected into the through hole 1111 of the nozzle 111 at least once in a high-speed pulse to remove the blockage and deposits.

[0123] It should be noted that the target flow rate can be specifically understood as the oxygen control gas flow rate in the first gas supply branch 113 before the flow controller 1122 is shut down. It may be the initial output flow rate in step S3 or the output flow rate after feedforward compensation adjustment in step S4. No specific limitation is made here.

[0124] like Figure 5 As shown, in some embodiments, before step S3, the liquid metal oxygen control method may further include step S7, controlling the oxygen control unit 11 to output at least three different flow rates in sequence, and collecting the pressure difference values ​​corresponding to the at least three different flow rates to obtain the flow rate-pressure difference characteristic curve.

[0125] Specifically, the oxygen control unit 11 sequentially outputs at least three different flow rates, which can be achieved by the control unit 13 controlling the flow controller 1122 of each oxygen control unit 11. The differential pressure values ​​corresponding to these at least three different flow rates are collected, which can be achieved by the control unit 13 controlling the differential pressure transmitter 1124. The flow-differential pressure characteristic curve can be obtained by fitting these at least three different flow rates and their corresponding differential pressure values.

[0126] It should be noted that these at least three different flow rates can be flexibly but uniformly selected based on the approximate flow rate range of the oxygen control unit 11 during normal oxygen control operations, and no specific limitation is made here. For example, when the initial output flow rate of the oxygen control unit 11 in a certain area is 10 sccm (standard cubic centimeters per minute), the three different flow rates can be 5 sccm, 10 sccm, and 15 sccm, respectively.

[0127] The flow-pressure characteristic curve obtained based on at least three different flow rates and their corresponding differential pressure values ​​can be achieved through fitting using existing techniques, which will not be elaborated further here.

[0128] In some embodiments, step S5 may include monitoring the differential pressure signal collected by the differential pressure transmitter 1124 and comparing it with the differential pressure value at the corresponding point on the flow-differential pressure characteristic curve.

[0129] Specifically, the control unit 13 can read the flow information and differential pressure information collected by the flow controller 1122 and the differential pressure transmitter 1124 at regular intervals, and compare them with the differential pressure values ​​at the corresponding points of the flow information in the flow-differential pressure characteristic curve.

[0130] It should be noted that this time period can be flexibly set based on the work process, such as 10s, 30s, 1 minute, 3 minutes, 5 minutes, 10 minutes, etc., and no specific limit is made here.

[0131] The preset conditions in step S6 may include that the abnormality rate of the differential pressure signal relative to the differential pressure value of the corresponding point on the flow-differential pressure characteristic curve exceeds a threshold.

[0132] Specifically, the anomaly rate of the differential pressure signal relative to the differential pressure value at the corresponding point on the flow-differential pressure characteristic curve can be calculated using Formula 1.

[0133] Formula 1 in, For the anomaly rate; This represents the pressure difference value at the point corresponding to the flow-pressure difference characteristic curve; The differential pressure signal is acquired by the differential pressure transmitter 1124.

[0134] The threshold can be greater than or equal to 10% and less than or equal to 35%. For example, the threshold can be 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, or any other value within this range.

[0135] By setting the preset condition that the anomaly rate exceeds a threshold, this invention can accurately determine the blockage of nozzle 111 while reducing the false judgment rate and avoiding the mis-execution of step S6 due to instantaneous pressure difference changes caused by system interference or other factors. Simultaneously, this application can accurately determine the gradual accumulation of impurities at the through-hole 1111 of nozzle 111, predicting the risk of blockage before it leads to excessively high pressure difference, and thus allowing cleaning before the through-hole 1111 is completely blocked, avoiding impact on oxygen control performance.

[0136] Furthermore, the preset condition may include that the abnormality rate of the differential pressure signal relative to the differential pressure value of the corresponding point on the flow-differential pressure characteristic curve exceeds a threshold and continues for a preset duration.

[0137] Specifically, the preset duration can be greater than or equal to 10 minutes and less than or equal to 45 minutes. For example, the preset duration can be 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, or any other value within this range.

[0138] This invention, by setting preset conditions including maintaining a preset duration exceeding a threshold, can further reduce the false judgment rate compared to immediately executing step S6 upon exceeding the threshold. It avoids the false triggering of step S6 due to factors such as temporary airflow obstruction. This ensures accurate unblocking operation when the through hole 1111 of nozzle 111 is blocked, avoids fluctuations in dissolved oxygen concentration of liquid metal 3 caused by frequent false triggering of unblocking, and avoids component wear caused by the opening and closing of flow controller 1122 and valve 1123 due to unblocking operation. This effectively improves the stability and service life of the liquid metal transport system in the reactor primary loop.

[0139] In other embodiments, the preset condition may also be that the difference between the differential pressure signal and the differential pressure value at the corresponding point of the flow-differential pressure characteristic curve exceeds a threshold, or that the difference between the differential pressure signal and the differential pressure value at the corresponding point of the flow-differential pressure characteristic curve exceeds a threshold and continues for a preset duration.

[0140] Understandably, the above-mentioned technical features can be used in any combination without restriction.

[0141] The above embodiments merely illustrate specific implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. An oxygen control module, characterized in that, include: At least one oxygen control unit (11) includes a nozzle (111) and an electronic control assembly (112); the nozzle (111) is provided with a plurality of through holes (1111) arranged at intervals for injecting oxygen control gas into liquid metal (3) in a dispersed bubbling form; the electronic control assembly (112) includes an oxygen sensor (1121) and a flow controller (1122); the oxygen sensor (1121) is used to collect the dissolved oxygen concentration in the liquid metal (3); the flow controller (1122) is used to control the gas flow rate at the nozzle (111); At least one gas injection unit (12), connected to the nozzle (111) of the at least one oxygen control unit (11), is used to store and supply oxygen control gas to the nozzle (111); and The control unit (13) is electrically connected to the at least one gas injection unit (12) and the at least one oxygen control unit (11), respectively.

2. The oxygen control module according to claim 1, characterized in that, The diameter of the through hole (1111) is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

3. The oxygen control module according to claim 1, characterized in that, The nozzle (111) is provided with at least two sets of through holes spaced apart along the axial direction of the nozzle (111); each set of through holes includes at least two through holes (1111), and the at least two through holes (1111) in each set of through holes are evenly spaced apart along the circumference of the nozzle (111).

4. The oxygen control module according to claim 3, characterized in that, The number of through-hole groups is greater than or equal to 3 and less than or equal to 10; and / or The number of through holes (1111) in each of the through hole groups is greater than or equal to 3 and less than or equal to 8.

5. The oxygen control module according to claim 3, characterized in that, The distance between two adjacent through-hole groups is greater than or equal to 1 mm and less than or equal to 6 mm.

6. The oxygen control module according to claim 5, characterized in that, The spacing between two adjacent through-hole groups is greater than the diameter of the through-hole (1111).

7. The oxygen control module according to any one of claims 1 to 6, characterized in that, The nozzle (111) is a tube closed at one end, and the plurality of through holes (1111) are provided on the side wall of the nozzle (111).

8. The oxygen control module according to claim 7, characterized in that, The diameter of the nozzle (111) is greater than or equal to 4 mm and less than or equal to 12 mm.

9. The oxygen control module according to any one of claims 1 to 6, characterized in that, The electronic control component (112) also includes a valve (1123), which is disposed in the pipeline connecting the gas injection unit (12) and the nozzle (111) for controlling the gas to be injected into the nozzle (111). The valve (1123) is electrically connected to the control unit (13).

10. The oxygen control module according to claim 9, characterized in that, The valve (1123) and the flow controller (1122) are connected in parallel and are respectively connected to the gas injection unit (12) and the nozzle (111).

11. The oxygen control module according to claim 9, characterized in that, The electronic control component (112) further includes a differential pressure transmitter (1124) for collecting the pressure difference between the stabilization point and the inlet end of the nozzle (111); the control unit (13) is configured to control the valve (1123) to spray airflow from the nozzle (111) when the signal collected by the differential pressure transmitter (1124) exceeds a threshold.

12. The oxygen control module according to any one of claims 1 to 6, characterized in that, The oxygen control module (10) includes at least two oxygen control units (11), which are respectively installed in different areas of the delivery pipeline (20) of the reactor primary loop liquid metal delivery system. The at least two oxygen control units (11) are electrically connected to the control unit (13) and respectively connected to the at least one gas injection unit (12).

13. The oxygen control module according to any one of claims 1 to 6, characterized in that, The electronic control assembly (112) also includes a temperature sensor (1125) for collecting the temperature of the liquid metal (3), and the temperature sensor (1125) is electrically connected to the control unit (13).

14. A reactor primary loop liquid metal transport system, characterized in that, It includes a delivery pipeline (20) for conveying liquid metal (3) and an oxygen control module (10) as described in any one of claims 1 to 13.

15. The reactor primary loop liquid metal transport system according to claim 14, characterized in that, The oxygen control module (10) includes at least two oxygen control units (11), which are respectively located in different areas of the delivery pipeline (20) and are electrically connected to the control unit (13); the control unit (13) is configured to control the at least two oxygen control units (11) to balance the dissolved oxygen concentration in the liquid metal (3) in different areas.

16. A liquid metal oxygen control method, applied to the liquid metal transport system of the reactor primary loop as described in claim 14, characterized in that, The liquid metal oxygen control method includes: Collect the state parameters of the liquid metal (3) in the delivery pipeline (20); Based on the target oxygen concentration and the state parameters, the initial output flow rate of the oxygen control unit (11) is obtained; The oxygen control unit (11) is controlled to output oxygen control gas at the initial output flow rate.

17. The liquid metal oxygen control method according to claim 16, characterized in that, The oxygen control module (10) includes at least two oxygen control units (11), which are respectively located in different areas of the delivery pipeline (20) and are electrically connected to the control unit (13). The liquid metal oxygen control method includes: Collect the state parameters of the liquid metal (3) in different areas of the delivery pipeline (20); Based on the target oxygen concentration, the state parameters of each region, and the flow field model of the delivery pipeline (20), the initial output flow rate of the oxygen control unit (11) corresponding to each region and the crosstalk arrival time between each region are obtained. The oxygen control unit (11) in each region outputs oxygen control gas at the initial output flow rate; Based on the crosstalk arrival time, the output flow of the oxygen control unit (11) in the target area is compensated and adjusted before the predicted crosstalk effect reaches the target area.

18. The liquid metal oxygen control method according to claim 16, characterized in that, The state parameters include dissolved oxygen concentration and temperature.

19. The liquid metal oxygen control method according to claim 17, characterized in that, The step of adjusting the output flow of the oxygen control unit (11) in the target area according to the crosstalk arrival time, before the predicted crosstalk effect reaches the target area, includes: Based on the time required for gas to diffuse from one region to the target region, the output flow rate of the oxygen control unit (11) in the target region is adjusted and compensated in advance before the crosstalk effect reaches the target region.

20. The liquid metal oxygen control method according to claim 19, characterized in that, The compensation adjustment of the output flow rate of the oxygen control unit (11) in the target area includes: The output flow rate of the oxygen control unit (11) in the target area is reduced by a preset ratio.

21. The liquid metal oxygen control method according to claim 20, characterized in that, The preset ratio is greater than or equal to 1% and less than or equal to 10%; and / or The preset time is greater than or equal to 3 seconds and less than or equal to 15 seconds.

22. The liquid metal oxygen control method according to claim 16, characterized in that, The electronic control assembly (112) also includes a valve (1123) and a differential pressure transmitter (1124). The valve (1123) is used to control the gas injection into the nozzle (111), and the differential pressure transmitter (1124) is used to collect the pressure difference between the stabilizing point and the inlet end of the nozzle (111). The liquid metal oxygen control method further includes: Monitor the differential pressure signal acquired by the differential pressure transmitter (1124); When the differential pressure signal meets the preset conditions, the valve (1123) is controlled to spray gas into the through hole (1111) of the nozzle (111) at least once to clear the blockage.

23. The liquid metal oxygen control method according to claim 22, characterized in that, Before controlling the oxygen control unit (11) to output oxygen control gas at the initial output flow rate, the liquid metal oxygen control method further includes: The oxygen control unit (11) is controlled to output at least three different flow rates in sequence, and the pressure difference values ​​corresponding to the at least three different flow rates are collected to obtain the flow rate-pressure difference characteristic curve. The preset conditions include that the abnormality rate of the differential pressure signal relative to the differential pressure value at the corresponding point on the flow-differential pressure characteristic curve exceeds a threshold.

24. The liquid metal oxygen control method according to claim 23, characterized in that, The preset conditions include that the abnormality rate of the differential pressure signal relative to the differential pressure value of the corresponding point on the flow-differential pressure characteristic curve exceeds a threshold and continues for a preset duration.

25. The liquid metal oxygen control method according to claim 24, characterized in that, The threshold is greater than or equal to 10% and less than or equal to 35%; and / or The preset duration is greater than or equal to 10 minutes and less than or equal to 45 minutes.

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