Impurity online monitoring system

Abstract

The invention discloses an impurity online monitoring system. The system comprises an embedded measuring pipeline and a non-embedded laser device, a laser detection port is arranged between the inflow interface and the outflow interface of the embedded measuring pipeline; the laser detection port is used for entering and exiting of laser; the non-embedded laser device comprises a light path assembly and a laser transmit-receive assembly. The light path assembly guides the laser emitted by the laser receiving and transmitting assembly into the laser detection port and guides the laser returned by the laser detection port into the laser receiving and transmitting assembly. The on-line impurity monitoring system overcomes the defects that traditional off-line sampling measurement is large in deviation and poor in real-time performance, and real-time on-line monitoring, analysis and tracking of impurities at the liquid metal liquid level are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of online component monitoring, and in particular to an impurity online monitoring system. Background Art

[0002] Lead-cooled fast reactor is a fast neutron reactor that uses lead-based liquid metal (liquid lead or liquid lead-bismuth alloy) as coolant. It is one of the six main reactor types developed for the international IV generation advanced fast reactor. Lead-cooled fast reactor has high neutron economy, strong inherent safety, good nuclear waste transmutation and nuclear fuel proliferation capabilities, and has broad application prospects. However, after long-term operation of lead-cooled fast reactors, due to coolant oxidation, corrosion of structural pipes and equipment wear, lead-based liquid metal coolants will produce shaped impurities such as PbO, Fe3O4, Cr2O3, NiO and steel fragments, which affect the thermal performance of lead-based liquid metal coolants. Some impurities migrate with the flow of coolant as inclusions, and are easily deposited in the slow flow area or float on the free liquid surface, causing scaling in the reactor, and even clogging and wear of the core, posing a major safety hazard.

[0003] At present, the mainstream impurity analysis technology in liquid metal uses sampling-filtering equipment to separate and capture inclusions, and then detects the sampled impurities after cooling. However, the existing efforts to separate and capture molded impurities in liquid coolants belong to offline analysis, which is usually affected by the sampling position and has large errors. In addition, it is difficult to obtain real information in a high-temperature, closed environment by performing offline analysis of impurities after capture. There are deviations and lags in using offline analysis results to judge the operation and corrosion conditions in the pile, which affects the operation of the system. Summary of the invention

[0004] In view of this, the present invention provides an impurity online monitoring system, the main purpose of which is to solve the problems of deviation and hysteresis caused by offline analysis of impurities in liquid metal.

[0005] According to one aspect of the present invention, there is provided an impurity online monitoring system, comprising: an embedded measurement pipeline and a non-embedded laser device;

[0006] A laser detection port is provided between the inflow port and the outflow port of the embedded measuring pipeline; the laser detection port is used for the entry and exit of the laser;

[0007] The non-embedded laser device comprises an optical path component and a laser transceiver component; the optical path component guides the laser emitted by the laser transceiver component into the laser detection port, and guides the laser returned from the laser detection port into the laser transceiver component.

[0008] Optionally, a transparent lens and a pressing top cover are provided at the laser entrance of the laser detection port, and the transparent lens is fixed in a mounting groove between the laser detection port and the pressing top cover;

[0009] An air inlet and an air outlet are provided on the side wall of the laser detection port, and the air inlet and the air outlet are used for protecting the air flow.

[0010] Optionally, the compression top cover and the end of the laser detection port contacting the transparent lens are respectively provided with sealing grooves; a sealing ring is embedded in the sealing groove, and the sealing ring contacts and seals with the transparent lens;

[0011] An annular sealing gasket is arranged on the outer ring of the transparent lens and between the contact surface of the pressing top cover and the laser detection port.

[0012] Optionally, a cooling sleeve or a cooling spiral coil is provided on the outer wall of the laser detection port of the embedded measuring pipeline;

[0013] Optionally, a heat-insulating portion is provided on the outer wall of the remaining pipe except the laser detection port; the heat-insulating portion includes at least one of an electric heating wire, a heating tape and heat-insulating cotton.

[0014] Optionally, an auxiliary instrument access port is further provided between the inflow port and the outflow port;

[0015] The auxiliary instrument access port at least includes a liquid level sensor access port.

[0016] Optionally, a sampling port is further provided between the inflow interface and the outflow interface;

[0017] The sampling port is detachably provided with a sampling top cover and a sealing ring to seal the sampling port.

[0018] Optionally, the system further comprises a position adjustment component;

[0019] The optical path component and the laser transceiver component are fixed on the position adjustment component, so that the position adjustment component drives the focus of the laser injected into the embedded measuring pipe to move in various directions.

[0020] Optionally, the optical path components include a reflector, a dichroic mirror and a focusing mirror;

[0021] The laser emitted by the laser transceiver assembly is projected onto the liquid surface to be detected at the laser detection port through the dichroic mirror and the focusing mirror in sequence;

[0022] The laser reflected by the liquid surface to be detected is projected into the laser transceiver assembly through the focusing mirror, the dichroic mirror and the reflecting mirror in sequence.

[0023] Optionally, the laser transceiver assembly includes a light source module, a spectrum analysis module and a signal control module;

[0024] The light source module emits laser light onto the dichroic mirror, and guides the laser light into the laser detection port of the embedded measuring pipe through reflection of the dichroic mirror and focusing of the focusing mirror;

[0025] The spectrum analysis module receives the detection light signal returned by the reflector, and performs online analysis of impurities in the liquid metal coolant through the detection light signal;

[0026] The signal control module sends a position adjustment instruction to the position adjustment component according to the detection light signal of the spectrum analysis module and the liquid level height in the embedded measurement pipeline.

[0027] Optionally, the position adjustment assembly includes movable brackets on three axial planes: x, y, and z;

[0028] The movable bracket on the z-axis plane fixes the non-embedded laser device, and moves the non-embedded laser device up and down based on the signal control module;

[0029] The movable bracket on the x-axis and y-axis planes is in contact with the ground, and based on the signal control module, the non-embedded laser device is moved forward and backward or left and right.

[0030] By means of the above technical solution, the technical solution provided by the embodiment of the present invention has at least the following advantages:

[0031] The present invention provides an impurity online monitoring system. Compared with the prior art, the present invention connects an embedded measurement pipeline in the main channel or bypass pipeline of the lead-based liquid metal cooling system, and uses the laser transceiver component and the optical path component in the non-embedded laser device to perform non-contact detection and processing on the lead-based liquid metal coolant. Compared with the traditional offline sampling measurement, the embedded measurement pipeline in the present invention has the advantages of simple structure, low modification difficulty, and convenient operation. In addition, the present invention can realize the rapid analysis and tracking of impurities at the liquid surface of the liquid metal coolant, overcoming the shortcomings of the traditional offline sampling measurement with large deviation and poor real-time performance.

[0032] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0034] Figure 1 A schematic structural diagram of an impurity online monitoring system provided by an embodiment of the present invention is shown;

[0035] Figure 2 A schematic diagram of the structure of an embedded measurement pipeline provided by an embodiment of the present invention is shown;

[0036] Figure 3 A partial schematic diagram of a laser detection port provided by an embodiment of the present invention is shown;

[0037] Among them, 10-embedded measuring pipe; 11-laser detection port; 12-sampling port; 13-air inlet; 14-air outlet; 15-sampling port top cover; 16-pressing top cover; 20-liquid metal; 21-inclusions; 30-spectral analysis module; 31-light source module; 32-signal control module; 33-position adjustment component; 40-optical path component; 41-transparent lens; 42-focusing lens; 43-dichroic mirror; 44-reflector; 50-annular sealing gasket; 51-sealing ring; 60-oxygen sensor; 61-temperature sensor; 62-liquid level sensor. DETAILED DESCRIPTION

[0038] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0039] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0040] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0041] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0042] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0043] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0044] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0045] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0046] The embodiment of the present invention provides an impurity online monitoring system, such as Figure 1 As shown, the system includes: an embedded measuring pipe 10 and a non-embedded laser device; a laser detection port 11 is set between the inflow interface and the outflow interface of the embedded measuring pipe 10; the laser detection port 11 is used for the entry and exit of the laser; the non-embedded laser device includes an optical path component 40 and a laser transceiver component; the optical path component guides the laser emitted by the laser transceiver component into the laser detection port 11, and guides the laser returned from the laser detection port 11 into the laser transceiver component.

[0047] In the embodiment of the present invention, the inflow interface and the outflow interface of the embedded measuring pipe 10 are both provided with flanges, and the embedded measuring pipe 10 is connected to the main channel or bypass pipe of the lead-based liquid metal cooling system by flange connection. In other implementation cases, the inflow interface and the outflow interface of the embedded measuring pipe 10 can also be embedded in the main channel or bypass pipe of the lead-based liquid metal cooling system by welding, which is not strictly limited in this embodiment. When it is necessary to perform online detection of impurities in the liquid metal 20, the non-embedded laser device is turned on, and the laser transceiver component in the non-embedded laser device generates laser, which enters the laser detection port 11 after being processed by the optical path component 40, and is incident on the surface of the liquid metal 20 in the embedded measuring pipe 10. Regardless of whether there are inclusions 21 on the surface of the liquid metal 20, reflected light will be generated by the reflection principle of light, and the reflected laser will enter the laser transceiver component after being processed by the optical path component 40, so that the laser transceiver component performs real-time analysis and processing on the impurities in the liquid metal 20 based on the reflected laser.

[0048] In other embodiments, without affecting the operation of the laser detection port 11, the structure of the embedded measuring pipe 10 can be bent 0 to 180 degrees or designed in sections for convenience of installation and modification. For example, the embedded measuring pipe 10 is bent 90 degrees to form a pipe shape with a right-angle structure, or bent 180 degrees to form a pipe shape with a "U" shape, so that the modified pipe shape is easier to embed into the existing main channel or bypass pipe.

[0049] Based on the above embodiments, Figure 2 As shown, in order to prevent the liquid metal from being oxidized and to prevent the entry of foreign matter without affecting the laser incident on the liquid surface to be detected, a transparent lens 41 and a pressing top cover 16 are arranged at the laser entrance of the laser detection port 11, and the transparent lens 41 is fixed in the mounting groove between the laser detection port 11 and the pressing top cover 16; an air inlet 13 and an air outlet 14 are provided on the side wall of the laser detection port 11, and the air inlet 13 and the air outlet 14 are used to protect the gas flow. Among them, the inner diameter of the mounting groove is slightly larger than the outer diameter of the transparent lens 41. Among them, the material selection of the transparent lens 41 must meet the requirements of the ambient temperature and the transmittance of the laser wavelength (≥80%). In this embodiment, the material of the transparent lens 41 is high temperature resistant quartz glass, with a tolerance temperature of ≤1100°C, and an average transmittance of 900-1100nm band light ≥95%. Among them, the protective gas is preferably high purity argon gas, which is not strictly limited in this embodiment.

[0050] In other implementation cases, the transparent lens 41 may also be made of borosilicate glass, high borosilicate glass, fluoride crystal, polymer resin glass or YAG matrix crystal, etc., which is not strictly limited in this embodiment.

[0051] Based on the above embodiments, Figure 3 As shown, in order to meet the airtightness requirements of the upper space of the liquid metal to be detected in the embedded measuring pipeline, sealing grooves are respectively provided at the end of the pressing top cover 16 and the end of the laser detection port 11 contacting the transparent lens 41; a sealing ring 51 is embedded in the sealing groove, and the sealing ring 51 is in contact and sealed with the transparent lens 41; an annular sealing gasket 50 is provided between the outer ring of the transparent lens 41 and the contact surface of the pressing top cover 16 and the laser detection port 11. Preferably, the annular sealing gasket 50 is in the form of a metal winding gasket, and the material is a stainless steel graphite winding gasket. Preferably, the sealing ring 51 is made of a graphite sealing ring.

[0052] In other implementation cases, the annular sealing gasket 50 may be a stainless steel asbestos gasket, a stainless steel PTFE gasket, etc., which is not strictly limited in this embodiment. The sealing ring 51 may also be a metal winding gasket, a graphite composite ring, a Teflon sealing ring or a perfluoroether sealing ring, etc., which is not strictly limited in this embodiment.

[0053] In other implementation cases, in order to meet the airtightness requirements of the upper space of the liquid metal to be detected in the embedded measuring pipeline, sealing can also be achieved by thread (with gasket), flange (with gasket) or welding.

[0054] In another embodiment, in order to reduce the impact of high temperature on air tightness without affecting the normal operating temperature of liquid metal in the embedded measuring pipe, a cooling sleeve or a cooling spiral coil is provided on the outer wall of the laser detection port 11 of the embedded measuring pipe 10; an insulation part is provided on the outer wall of the remaining pipes except the laser detection port 11; in this embodiment, the insulation part includes one or more combinations of electric heating wires, heating belts and thermal insulation cotton to realize temperature control and insulation functions.

[0055] In this embodiment, when the high temperature environment exceeds the heat resistance temperature of the annular sealing gasket 50 and the sealing ring 51, any one of the media such as water and air is introduced into the cooling sleeve or the cooling spiral coil to cool the laser detection port 11, which can effectively prevent the annular sealing gasket 50 and the sealing ring 51 from failing.

[0056] In other implementation cases, in order to prevent the annular sealing gasket 50 and the sealing ring 51 from failing, the length of the laser detection port 11 may be increased to keep the annular sealing gasket 50 and the sealing ring 51 away from the liquid metal 20 .

[0057] In another embodiment, Figure 2 As shown, in order to ensure the stable operation of the system, an auxiliary instrument access port is further provided between the inflow port and the outflow port; the auxiliary instrument access port at least includes a liquid level sensor access port.

[0058] In this embodiment, auxiliary instruments are installed on the opening (hole) of the embedded measuring pipe 10, including an oxygen sensor 60, a temperature sensor 61 and a liquid level sensor 62. The oxygen sensor 60 and the temperature sensor 61 provide verification or correction signals of dissolved oxygen concentration and temperature for the detection results, and the liquid level sensor 62 is used to detect the liquid level in the embedded measuring pipe 10, and can provide early warning information when the liquid level is too low. In addition, the position of the non-embedded laser device can also be adjusted based on the detected liquid level.

[0059] In other implementation cases, the auxiliary instrument may only be the liquid level sensor 62, or a free combination of the liquid level sensor 62, the oxygen sensor 60, and the thermocouple 61. Under the premise of not affecting the operation of the laser detection port 11, the position of the auxiliary instrument access port can be freely adjusted to the front and rear sides of the laser detection port 11.

[0060] In another embodiment, Figure 2As shown, in order to verify and correct the online monitoring results, a sampling port 12 is further provided between the inflow interface and the outflow interface; a sampling port top cover 15 and a sealing ring are detachably provided on the sampling port 12 to seal the sampling port.

[0061] In this embodiment, the sampling port 12 on the embedded measuring pipe 10 is connected to the sampling port top cover 15 through a flange and sealed with a sealing gasket. The sampling port 12 can be used as an offline sampling port, and offline analysis is performed after sampling, and the sampling port is verified and corrected with the online monitoring results. In addition, the sampling port 12 can also be used as an endoscope insertion port, a spare observation port, and an inspection port, etc., which are not strictly limited in this embodiment.

[0062] In another embodiment, Figure 1 As shown, in order to adapt to the liquid level fluctuation of liquid metal and the movement of inclusions, the system also includes a position adjustment component 33; the optical path component 40 and the laser transceiver component are fixed on the position adjustment component 33, so that the position adjustment component 33 drives the laser focus injected into the embedded measuring pipe 10 to move in various directions.

[0063] In this embodiment, under the movement control of the position adjustment component 33, the laser focus processed by the laser transceiver component and the optical path component 40 moves in three axes (front and back, left and right, up and down) near the liquid surface of the liquid metal 20, which can be used for rapid analysis and tracking of inclusions 21 at the liquid surface of the liquid metal 20.

[0064] In another embodiment, Figure 1 As shown, in order to accurately guide the laser into the laser detection port and accurately receive the reflected laser of the liquid metal, the optical path component 40 includes a reflector 44, a dichroic mirror 43 and a focusing mirror 42; the laser emitted by the laser transceiver component is sequentially projected onto the liquid surface to be detected at the laser detection port 11 through the dichroic mirror 43 and the focusing mirror 42; the laser reflected by the liquid surface to be detected is sequentially projected onto the laser transceiver component through the focusing mirror 42, the dichroic mirror 43 and the reflector 44.

[0065] In this embodiment, the laser transceiver assembly emits a laser, which is reflected by the dichroic mirror 43 of the optical path assembly 40, and then passes through the focusing mirror 42 and the transparent lens 41 to enter the laser detection port 11, and is incident on the liquid surface of the liquid metal 20. Through the principle of light reflection, the laser is reflected from the liquid surface of the liquid metal 20. The wavelength and intensity of the reflected laser are related to the element type and concentration of the inclusion 21. After the reflected laser signal returns through the focusing mirror 42 and the dichroic mirror 43 in the optical path assembly 40, it is introduced into the laser transceiver assembly by the reflector 44. In this embodiment, the optical path assembly 40 can also be connected to the laser transceiver assembly through a guide optical fiber and a connector to conduct the incident laser or the reflected laser.

[0066] Based on the above embodiments, Figure 1 As shown, in order to improve the real-time performance of online impurity analysis in liquid metal, the laser transceiver assembly includes a light source module 31, a spectral analysis module 30 and a signal control module 32; the light source module 31 emits laser light to the dichroic mirror 43, and guides the laser light to the laser detection port 11 of the embedded measuring pipe 10 through reflection of the dichroic mirror 43 and focusing of the focusing mirror 42; the spectral analysis module 30 receives the detection light signal returned by the reflector 44, and performs online analysis of impurities in the liquid metal coolant through the detection light signal; the signal control module 32 sends a position adjustment instruction to the position adjustment assembly 33 according to the detection light signal of the spectral analysis module 30 and the liquid level height in the embedded measuring pipe 10.

[0067] In this embodiment, the light source module 31 is preferably a Nd:YAG laser with a laser wavelength of 1064nm. The light source module 31 emits laser light to the dichroic mirror 43, and the laser light is introduced into the laser detection port 11 of the embedded measuring pipe 10 through the reflection of the dichroic mirror 43 and the focusing of the focusing mirror 42, and irradiates the inclusions 21 on the liquid surface of the liquid metal 20. The inclusions 21 reflect the laser light, and the reflected laser signal returns through the focusing mirror 42 and the dichroic mirror 43 in the optical path component 40, and is introduced into the spectrum analysis module 30 by the reflector 44. The spectrum analysis module 30 collects the spectrum signal through a detector placed in the focal plane, wherein the detector can select a CCD array (camera), an ICCD array (camera) detection element, etc., which is not strictly limited in this embodiment. The reflected laser light is detected and analyzed on the detector, and the analysis result is transmitted to the signal control module 32. The signal control module 32 processes the measurement signals of the spectrum analysis module 30 and the auxiliary instruments, and feedback-adjusts the light source module 31 , the optical path component 40 and the position adjustment component 33 , so that the incident laser is focused and irradiated on the inclusions 21 on the liquid surface of the liquid metal 20 .

[0068] In other implementation cases, the light source module 30 may also select a solid laser source (ruby laser), a gas laser source (He-Ne laser) or a liquid laser source (dye laser) according to the characteristic spectrum of the sample, which is not strictly limited in this embodiment.

[0069] Based on the above embodiments, Figure 1As shown, in order to facilitate the adjustment of the incident laser in various directions, the position adjustment component includes movable brackets on three axis planes: x, y, and z; the movable bracket on the z axis plane fixes the non-embedded laser device, and moves the non-embedded laser device up and down based on the signal control module 32; the movable brackets on the x and y axis planes are in contact with the ground, and move the non-embedded laser device forward and backward or left and right based on the signal control module 32.

[0070] In this embodiment, when testing a static working fluid, the liquid level sensor 62 outputs a liquid level signal to the signal control module 32. According to the signal strength of the spectral analysis module 30 and the signal of the liquid level sensor 62, the signal control module 32 issues an instruction to control the position adjustment module 33, and prompts the operator to adjust the optical path module 40 so that the laser focus is irradiated on the inclusion 21, that is, the output signal intensity of the spectral analysis module 30 reaches a maximum value. When measuring a dynamic working fluid, it is recommended to make the flow rate of the liquid metal 20 in the embedded measuring pipe 10 <0.5m / s, and the spectral analysis module 30 can better obtain the component information of the inclusion 21 on the liquid surface of the dynamic liquid metal 20. In addition, the inclusion sampling and offline analysis can be carried out through the sampling port 12, and the sampling and analysis results can be used to verify the accuracy of the laser online monitoring data. The oxygen sensor 60 and the temperature sensor 61 provide the dissolved oxygen concentration and temperature of the liquid metal 20. In addition to verifying or correcting the test signal, impurity precipitation and purification tests can also be carried out.

[0071] It should be noted that the impurity online monitoring system disclosed in the above embodiment can be used for online monitoring of impurity components of lead-based liquid metal, and can also be used for online monitoring of impurities of other liquid metal working fluids such as liquid sodium, liquid steel, and liquid aluminum. When used for impurity analysis of other working fluids, it is necessary to adjust the structure of the embedded measurement pipeline, replace the type of light source module and the transparent lens material of the test window according to the impurity type and test environment, etc., which is not strictly limited in this embodiment.

[0072] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An impurity online monitoring system, characterized in that: Includes embedded measurement pipelines and non-embedded laser devices; A laser detection port is provided between the inflow port and the outflow port of the embedded measuring pipeline; the laser detection port is used for the entry and exit of the laser; The non-embedded laser device comprises an optical path component and a laser transceiver component; the optical path component guides the laser emitted by the laser transceiver component into the laser detection port, and guides the laser returned from the laser detection port into the laser transceiver component.

2. The impurity online monitoring system according to claim 1, characterized in that: A transparent lens and a pressing top cover are provided at the laser entrance of the laser detection port, and the transparent lens is fixed in a mounting groove between the laser detection port and the pressing top cover; An air inlet and an air outlet are provided on the side wall of the laser detection port, and the air inlet and the air outlet are used for protecting the air flow.

3. The impurity online monitoring system according to claim 2, characterized in that: The pressing top cover and the end of the laser detection port contacting the transparent lens are respectively provided with sealing grooves; a sealing ring is embedded in the sealing groove, and the sealing ring contacts and seals with the transparent lens; An annular sealing gasket is arranged on the outer ring of the transparent lens and between the contact surface of the pressing top cover and the laser detection port.

4. The online impurity monitoring system according to claim 1, characterized in that: A cooling sleeve or a cooling spiral coil is provided on the outer wall of the laser detection port of the embedded measuring pipeline; A heat preservation part is arranged on the outer wall of the pipeline except the laser detection port; the heat preservation part comprises at least one of an electric heating wire, a heating belt and a heat preservation cotton.

5. The impurity online monitoring system according to claim 1, characterized in that: An auxiliary instrument access port is also provided between the inflow port and the outflow port; the auxiliary instrument access port at least includes a liquid level sensor access port.

6. The impurity online monitoring system according to claim 1, characterized in that: A sampling port is also provided between the inflow interface and the outflow interface; The sampling port is detachably provided with a sampling port top cover and a sealing ring to seal the sampling port.

7. The impurity online monitoring system according to claim 1, characterized in that: The system also includes a position adjustment component; The optical path component and the laser transceiver component are fixed on the position adjustment component, so that the position adjustment component drives the focus of the laser injected into the embedded measuring pipe to move in various directions.

8. The impurity online monitoring system according to claim 1, characterized in that: The optical path components include a reflector, a dichroic mirror and a focusing mirror; The laser emitted by the laser transceiver assembly is projected onto the liquid surface to be detected at the laser detection port through the dichroic mirror and the focusing mirror in sequence; The laser reflected by the liquid surface to be detected is projected into the laser transceiver assembly through the focusing mirror, the dichroic mirror and the reflecting mirror in sequence.

9. The impurity online monitoring system according to claim 8, characterized in that: The laser transceiver assembly includes a light source module, a spectrum analysis module and a signal control module; The light source module emits laser light onto the dichroic mirror, and guides the laser light into the laser detection port of the embedded measuring pipe through reflection of the dichroic mirror and focusing of the focusing mirror; The spectrum analysis module receives the detection light signal returned by the reflector, and performs online analysis of impurities in the liquid metal coolant through the detection light signal; The signal control module sends a position adjustment instruction to the position adjustment component according to the detection light signal of the spectrum analysis module and the liquid level height in the embedded measurement pipeline.

10. The impurity online monitoring system according to claim 9, characterized in that: The position adjustment assembly includes movable brackets on three axial planes: x, y and z; The movable bracket on the z-axis plane fixes the non-embedded laser device, and moves the non-embedded laser device up and down based on the signal control module; The movable bracket on the x-axis and y-axis planes is in contact with the ground, and based on the signal control module, the non-embedded laser device is moved forward and backward or left and right.

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