Device for measuring liquid level height of molten salt heat storage tank and working method thereof

Abstract

The invention belongs to the technical field of molten salt heat storage tank liquid level measurement, and discloses a device for measuring the liquid level height of a molten salt heat storage tank and a working method of the device. According to the device for measuring the liquid level height of the molten salt heat storage tank, an installation block is used for being installed on the top of the molten salt heat storage tank with the liquid level height to be measured, a distance measuring device is integrally arranged in the installation block, and the distance measuring device comprises a laser distance measuring unit and a microwave radar distance measuring unit; the rail rod is used for being vertically installed in a fused salt heat storage tank to be subjected to liquid level height measurement. The floating disc is used for being arranged in a fused salt heat storage tank to be subjected to liquid level height measurement and is slidably installed on the rail rod. The dynamic air curtain protection assembly is used for forming a protection air curtain near the distance measuring device in the liquid level height measuring process; and the operation output unit is used for calculating and outputting the liquid level height value of the molten salt heat storage tank by adopting a weighted average algorithm. According to the method, the measurement robustness and the measurement accuracy can be remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid level measurement of molten salt heat storage tanks, and in particular relates to a device for measuring the liquid level height of a molten salt heat storage tank and a working method thereof. Background Art

[0002] In the development of concentrated solar thermal power plants, molten salt, as a highly effective heat transfer and storage medium, has become a crucial factor in ensuring long-term, stable power generation. For example, traditional molten salt, used in many actual power plant projects, is typically a mixture of 60% sodium nitrate and 40% potassium nitrate. This molten salt is also used in several CSP (Concentrated Solar Power) plants in the United States and Spain. This enables CSP plants to provide 24-hour continuous power supply and highly adjustable output power, making them comparable to traditional coal-fired, gas-fired, and nuclear power generation methods. Research and development of additional heat storage media for CSP applications has been ongoing, but to date, none has rivaled the performance of molten salt.

[0003] In the practical application of molten salt, the measurement of the liquid level height of the molten salt heat storage tank is of great significance. Specifically, the liquid level height can indirectly obtain the storage capacity of high-temperature molten salt, and then evaluate the heat in the heat storage tank that can be used for power generation, which can ensure the stability and reliability of power generation in the power station. The change in liquid level can be used to control the flow of the molten salt pump in real time to avoid equipment damage or reduced power generation efficiency due to abnormal liquid level. Liquid level monitoring can prevent the molten salt tank from being overfilled or overempty, avoiding safety accidents such as leakage and explosion caused by abnormal liquid level.

[0004] Existing liquid level height measurement methods mainly use various forms of liquid level gauges for detection, which are not suitable for measuring the liquid level height of molten salt heat storage tanks. Specifically, the existing liquid level height measurement device is easily damaged or fails in a high temperature environment, and requires the use of high temperature resistant materials or optimized installation structure, which increases the cost and technical difficulty. In the high temperature and high pressure environment of the molten salt heat storage tank, salt mist condensation easily forms a salt particle crystal layer on the surface of the liquid level gauge, resulting in a decrease in measurement accuracy or instrument failure. The existing liquid level height measurement method is difficult to guarantee measurement accuracy and stability in harsh environments such as high temperature, high pressure, and salt mist, and is prone to errors or failures. The molten salt heat storage tank is a high temperature and high pressure closed container. When the liquid level gauge fails, it needs to wait for the tank to cool down before it can be replaced, and the maintenance and repair costs are high. In summary, given that the liquid level height in the molten salt heat storage tank is not easy to monitor in real time, and the existing ordinary liquid level measurement device cannot work effectively in a high temperature and high pressure environment, it is urgent to provide a new molten salt heat storage tank liquid level height measurement device. Summary of the Invention

[0005] The present invention aims to provide a device and method for measuring the liquid level of a molten salt heat storage tank, thereby addressing one or more of the aforementioned technical problems. The disclosed technical solution overcomes the limitations of existing measurement solutions in high-temperature, salt-fog environments, significantly improving measurement robustness and accuracy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a device for measuring the liquid level of a molten salt heat storage tank, comprising: a mounting block, a distance measuring device, a track rod, a floating plate, a dynamic air curtain protection assembly, and an operation output unit; wherein, The mounting block is used to be mounted on the top of the molten salt heat storage tank to be measured for liquid level height, and the mounting block is integrated with the distance measuring device; wherein the distance measuring device includes a laser distance measuring unit and a microwave radar distance measuring unit; The track rod is used to be vertically installed in the molten salt heat storage tank to be measured for liquid level height; wherein, the two ends of the track rod are respectively installed on the bottom of the molten salt heat storage tank to be measured for liquid level height and the mounting block; The floating plate is used to be arranged in the molten salt heat storage tank to be measured for liquid level height, and is slidably mounted on the track rod; The dynamic air curtain protection component is used to form a protective air curtain near the distance measuring device during the liquid level measurement process; The calculation output unit is used to obtain the collected data of the laser ranging unit and the microwave radar ranging unit, and use the weighted average algorithm to calculate and output the liquid level height value of the molten salt heat storage tank; wherein, the collected data is the distance value between the floating plate and the ranging device.

[0007] A further improvement of the technical solution of the present invention is that the laser ranging unit and the microwave radar ranging unit are symmetrically arranged with respect to the central axis of the molten salt heat storage tank whose liquid level height is to be measured.

[0008] A further improvement of the technical solution of the present invention is that the dynamic air curtain protection assembly includes a plurality of nozzles; wherein, the plurality of nozzles are used to be arranged in a ring around the ranging device; each nozzle is connected to a gas delivery pipeline, and the gas delivery pipeline is provided with a gas drying and filtering device and a pressure regulating valve.

[0009] A further improvement of the technical solution of the present invention is that the surface of the track rod is coated with a wear-resistant coating.

[0010] A further improvement of the technical solution of the present invention is that an oblique opening is provided at the bottom of the edge of the floating plate, and the floating plate is provided with a self-correcting sliding block.

[0011] A further improvement of the technical solution of the present invention is that, in the calculation output unit, the step of obtaining the collected data of the laser ranging unit and the microwave radar ranging unit and calculating and outputting the liquid level height value of the molten salt heat storage tank using a weighted average algorithm includes: Performing temperature gradient compensation correction on the acquired data of the laser ranging unit to obtain corrected data; performing dynamic dielectric constant calibration on the acquired data of the microwave radar ranging unit to obtain calibrated data; Based on the corrected and calibrated data, a weighted average algorithm is used to calculate the output molten salt heat storage tank liquid level value; the weight distribution is adjusted according to the environmental signal-to-noise ratio.

[0012] A further improvement of the technical solution of the present invention lies in that, in the step of performing temperature gradient compensation correction on the acquired data of the laser ranging unit to obtain the corrected data, the compensation coefficient is obtained based on an array of temperature difference sensors arranged in the height direction of the tank body of the molten salt heat storage tank to be measured for the liquid level.

[0013] A further improvement of the technical solution of the present invention is that, in the step of dynamically calibrating the dielectric constant of the acquired data of the microwave radar ranging unit to obtain the calibrated data, the calibration parameters are generated based on the molten salt temperature-density relationship model.

[0014] In a second aspect, the present invention provides a molten salt heat storage tank provided with the device for measuring the liquid level height of the molten salt heat storage tank according to any one of the first aspects of the present invention.

[0015] A third aspect of the present invention provides a method for measuring the liquid level of a molten salt heat storage tank, comprising the following steps: The mounting block is mounted on the top of the molten salt heat storage tank whose liquid level is to be measured, and the track rod is vertically mounted inside the molten salt heat storage tank whose liquid level is to be measured; wherein the two ends of the track rod are respectively mounted on the bottom of the molten salt heat storage tank whose liquid level is to be measured and on the mounting block; the floating plate is slidably mounted on the track rod; The laser ranging unit and microwave radar ranging unit in the ranging device are used to collect the distance value between the floating plate and the ranging device. During the distance value collection process, a protective air curtain is formed near the ranging device by the dynamic air curtain protection component. The distance value data collected by the laser ranging unit and the microwave radar ranging unit are obtained through the calculation output unit, and the weighted average algorithm is used to calculate the output molten salt heat storage tank liquid level height value.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention specifically discloses a device for measuring the liquid level of a molten salt heat storage tank. This device, for the first time, integrates a laser ranging unit and a microwave radar ranging unit for molten salt heat storage tank level measurement. Leveraging the complementary nature of these two physical principles (light propagation and electromagnetic wave propagation), it addresses the limitations of existing measurement solutions in high-temperature, salt-fog environments. Through dual-modal fusion, it significantly improves measurement robustness and accuracy. The device incorporates a dynamic air curtain protection assembly that forms a dynamic air curtain (such as an inert gas or compressed air) around the ranging device, isolating it from the high-temperature salt-fog environment and preventing salt particles from crystallizing and adhering to the ranging device surface. This addresses the existing issue of salt-fog condensation causing measurement device failure, extending the device's service life and reducing maintenance costs. The device utilizes a vertical rail and float structure to create a physical reference for liquid-level measurement. The float slides as the liquid level rises and falls, providing a real-time physical calibration point for the ranging device and improving the reliability of measurement results.

[0017] To further explain, the laser ranging unit and the radar ranging unit are symmetrically arranged about the center axis of the tank body, which can reduce the measurement deviation caused by the tilt of the tank body or the uneven internal flow field, and further improve the measurement reliability.

[0018] To further explain, laser ranging has high accuracy but is easily affected by salt spray and temperature gradients; microwave radar has strong penetrability, but changes in dielectric constant affect measurement stability; in the preferred technical solution of the present invention, in order to further improve measurement accuracy, the original collected data is corrected and verified to further ensure the accuracy of the measurement results.

[0019] To further explain, in the preferred technical solution of the present invention, the weights of laser and radar ranging data are allocated in real time based on the signal-to-noise ratio (SNR), high SNR signals are given priority, and different working conditions are dynamically adapted. This solves the problem of decreased accuracy of a single sensor in a complex environment, realizes adaptive optimization, and can further effectively reduce measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below; obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 1 is a schematic diagram of the overall structure of a device for measuring the liquid level height of a molten salt heat storage tank in an embodiment of the present invention; Figure 2 This is a structural diagram of a floating plate in an embodiment of the present invention; Figure 3 is a structural diagram of a mounting block in an embodiment of the present invention; Figure 4 yes Figure 1 In the embodiment shown, a partial enlarged schematic diagram of point A; Figure 5 yes Figure 1 In the embodiment shown, a partial enlarged schematic diagram of point B; The explanations of the reference numerals in the figure are as follows: 1. molten salt heat storage tank; 2. top cover plate; 201. first slot; 3. mounting plate; 301. second slot; 4. mounting block; 401. edge plate; 402. cylindrical hole; 403. annular support plate; 404. through hole; 405. threaded hole; 5. ranging device; 501. transmitting head; 502. placing plate; 6. track rod; 601. threaded head; 7. floating plate; 701. vertical hole; 702. oblique mouth; 8. positioning block; 801. threaded sleeve. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments and technical solutions are only part of the embodiments of the present invention, not all of the embodiments.

[0023] All other embodiments obtained by persons of ordinary skill in the art based on the technical solutions disclosed in the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to these processes, methods, products, or apparatuses.

[0024] See also Figure 1 The embodiment of the present invention provides a device for measuring the liquid level height of a molten salt heat storage tank, comprising: a mounting block 4, a distance measuring device 5, a track rod 6, a floating plate 7, a dynamic air curtain protection component and an operation output unit; wherein, The mounting block 4 is used to be mounted on the top of the molten salt heat storage tank 1 whose liquid level is to be measured, and the mounting block 4 is integrated with the distance measuring device 5; wherein the distance measuring device 5 includes a laser distance measuring unit and a microwave radar distance measuring unit; in a further preferred technical solution, the laser distance measuring unit and the microwave radar distance measuring unit are symmetrical about the central axis of the molten salt heat storage tank 1 whose liquid level is to be measured; The dynamic air curtain protection component is used to form a protective air curtain near the distance measuring device 5 to prevent crystallization and other conditions from affecting the measurement accuracy; The track rod 6 is used to be vertically installed in the molten salt heat storage tank 1 to be measured for liquid level height; wherein, the two ends of the track rod 6 are respectively installed on the bottom of the molten salt heat storage tank 1 to be measured for liquid level height and the mounting block 4; The floating plate 7 is used to be arranged in the molten salt heat storage tank 1 to be measured for liquid level and is slidably mounted on the track rod 6; The calculation output unit is used to obtain the collected data of the laser ranging unit and the microwave radar ranging unit, and use the weighted average algorithm to calculate and output the liquid level height value of the molten salt heat storage tank; wherein, the collected data is the distance value between the floating plate 7 and the ranging device 5.

[0025] The technical solution provided by the embodiments of this invention systematically addresses the accuracy, stability, and maintenance challenges of molten salt thermal storage tank level measurement through the integration of multiple technologies (dual-mode ranging, air curtain protection, and physical positioning) and intelligent algorithms (weighted averaging), providing key support for the efficient operation of solar thermal power generation systems. Specifically, the technical solution of the embodiments of this invention uses a floating plate to locate the molten salt liquid level, and then uses a ranging device to measure the distance between the floating plate and the ranging device, thereby achieving molten salt level measurement.

[0026] As a preferred technical solution in an embodiment of the present invention, the dynamic air curtain protection assembly includes several nozzles positioned around the distance measuring device 5. These nozzles are used to spray nitrogen gas. These nozzles are connected to a nitrogen delivery pipeline equipped with a gas drying and filtering device and a pressure regulating valve. This preferred technical solution isolates the sensor from the high-temperature salt spray environment, preventing salt particles from crystallizing and adhering to the sensor surface, thereby improving measurement accuracy and service life.

[0027] As a preferred technical solution of an embodiment of the present invention, the raw data obtained by the laser ranging unit is corrected by temperature gradient compensation and then subjected to weighted averaging calculation; wherein, the compensation coefficient is obtained by an array of temperature difference sensors arranged in the height direction of the tank body; the microwave radar ranging data is dynamically calibrated by the dielectric constant of the medium and then subjected to weighted averaging calculation; wherein, the calibration parameters are generated based on the molten salt temperature-density relationship model; when the weighted averaging algorithm is used to output the final liquid level height value, the weight distribution can be automatically adjusted according to the environmental signal-to-noise ratio.

[0028] In a specific exemplary technical solution, during the temperature gradient compensation step, multiple high-precision temperature difference sensors are arranged along the height of the tank (e.g., at intervals of 1 meter) to form a vertical temperature gradient monitoring network. A temperature-refractive index relationship is established based on the Sellmeier equation or empirical formula. Based on the temperature distribution, the actual optical path length of the laser at each height segment is calculated and compared with the theoretical optical path length in the absence of a temperature gradient to obtain a compensation coefficient. This temperature gradient compensation method allows laser ranging to overcome the limitations of high-temperature environments and achieve industrial-grade high-precision liquid level measurement.

[0029] , ; Where, For the corrected data; The original collected data; k is the compensation coefficient; is the actual optical path; is the theoretical optical path when there is no temperature gradient.

[0030] In a specific exemplary technical solution, during the step of dynamic calibration of the dielectric constant, dielectric constant sensors (such as capacitive sensors) are arranged at different heights of the tank to monitor the local dielectric constant distribution in real time. Based on a molten salt temperature-dielectric constant database (such as experimental calibration data), the dielectric constant is inferred from the temperature distribution within the tank. The corrected expression is: ; Where, For the corrected data, For the original collected data, 、 are the initial dielectric constant and the calibration dielectric constant, respectively.

[0031] In a specific exemplary technical solution, when a weighted average algorithm is used to output the final liquid level value, the weight distribution can be automatically adjusted according to the environmental signal-to-noise ratio. The calculation expression of the liquid level measurement value is: ; Where, is the final liquid level measurement value; In a specific exemplary technical solution, the weight allocation function is calculated based on the signal-to-noise ratio of the two measurement signals and is dynamically allocated according to the current working conditions (for example, high-temperature areas rely more on laser ranging, low-temperature areas rely more on radar ranging, etc.).

[0032] As a preferred technical solution of the embodiment of the present invention, the surface of the track rod 6 can be coated with a wear-resistant coating; and a wedge-shaped self-correcting slider can be provided at the bottom of the floating plate 7 .

[0033] As a preferred technical solution of the embodiment of the present invention, the bottoms of both ends of the floating plate 7 are provided with bevels 702 , and the edges are provided with bevels 702 to reduce the flow resistance of the molten salt.

[0034] See also Figures 1 to 5, an embodiment of the present invention provides a molten salt heat storage tank, comprising: a molten salt heat storage tank 1, a top cover plate 2 is installed at the top of the molten salt heat storage tank 1, two first slots 201 are symmetrically provided in the middle of the top of the top cover plate 2, a mounting plate 3 is detachably installed in the middle of the top of the top cover plate 2, a second slot 301 is provided on the mounting plate 3 at a position directly above the first slot 201, a mounting block 4 is inserted and installed in the first slot 201 and the second slot 301, the inner walls of the first slot 201 and the second slot 301 are provided with sealing sleeves to elastically contact the outer wall of the mounting block 4, thereby ensuring the sealing of the top cover plate 2, a distance measuring device 5 is installed on one side of the mounting block 4, and the bottom end of the other side of the mounting block 4 is connected to the top of the track rod 6, the track rod 6 is arranged in the vertical direction, and the bottom end of the track rod 6 extends to the inner bottom surface of the molten salt heat storage tank 1, a floating plate 7 is movably connected to the track rod 6, and vertical holes 701 are provided at both ends of the floating plate 7 to respectively penetrate and cooperate with the two track rods 6. The laser distance measuring unit can be selected from a conventional cylindrical laser distance measuring device. In a specific embodiment of the present invention, the inner dimensions of the first slot 201 and the inner dimensions of the second slot 301 correspond to the outer dimensions of the mounting block 4. An edge plate 401 is provided at the top edge of the mounting block 4. The edge plate 401 is detachably mounted to the top of the mounting plate 3 via bolts.

[0035] In the embodiment of the present invention, a cylindrical hole 402 is provided on one side of the mounting block 4, and an annular support plate 403 is connected to the inner wall of the middle part of the inner cavity of the cylindrical hole 402. A through hole 404 is provided at the bottom end of the cylindrical hole 402, and a placement plate 502 is connected to the top end of the ranging device 5. The placement plate 502 is detachably mounted on the bottom end of the annular support plate 403. A transmitting head 501 is provided at the bottom end of the ranging device 5, and the transmitting head 501 is inserted into the through hole 404. The top end of the cylindrical hole 402 extends to the top end of the top cover plate 2, thereby facilitating the connection of external wires to the ranging device 5. A sealing sleeve is also provided in the through hole 404 to seal the periphery of the transmitting head 501. A threaded hole 405 is provided at the bottom end of the other side of the mounting block 4. Both ends of the track rod 6 are provided with a threaded head 601. The top end of the track rod 6 is threadedly engaged with the threaded hole 405. A positioning block 8 is detachably mounted on the bottom end of the track rod 6. The top end of the positioning block 8 is connected to a threaded sleeve 801 that is threadedly engaged with the threaded head 601. The bottom end of the positioning block 8 abuts against the inner bottom surface of the molten salt heat storage tank 1 to improve the stability of the track rod 6 within the molten salt heat storage tank 1. The length of the track rod 6 corresponds to the height of the inner cavity of the molten salt heat storage tank 1. The bottom ends of the floating plate 7 are provided with an oblique opening 702, which facilitates the extension of the molten salt liquid level to the lower surface of the floating plate 7. In the technical solution of the embodiment of the present invention, the float is limited by the track rod, so that the float moves only in the vertical direction, and the positioning of the molten salt liquid level is more accurate; the track rod can be detachably mounted on the mounting block, the mounting block can be detachably mounted on the mounting plate, and the mounting plate can be detachably mounted on the top cover plate, so that the combined installation, disassembly and maintenance of the entire device are very convenient, and the use effect is better.

[0036] The working principle of the technical solution of the embodiment of the present invention is as follows: when in use, first install the positioning plate to the bottom end of the track rod 6, then install the floating plate 7 to the track rod 6, insert the two track rods 6 into the two vertical holes 701 respectively, install the distance measuring device 5 into the cylindrical hole 402, fix the distance measuring device 5 by installing the placement plate 502 on the annular support plate 403, insert the mounting block 4 into the first notch and the second notch, install the edge plate 401 on the mounting plate 3, and then The mounting plate 3 is mounted on the top cover plate 2, and the top end of the track rod 6 is then mounted on the bottom end of the mounting block 4. Finally, the top cover plate 2 is mounted on the top end of the molten salt heat storage tank 1. After the top cover plate 2 is installed, the bottom end of the positioning plate is against the inner bottom surface of the molten salt heat storage tank 1, and the float 7 floats on the molten salt. When the molten salt liquid level changes, the height of the float 7 changes synchronously. The distance to the float 7 is detected by the distance measuring device 5, and the height of the float 7 is calculated, and then the liquid level of the molten salt is measured. The technical solution of the embodiment of the present invention is based on the distance measuring device and the float to locate and measure the liquid level. The overall device structure is simple and easy to operate. Each component is easy to disassemble, replace and repair. It is convenient and quick to use and can improve the accuracy and robustness of the measurement.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it should be understood that although this specification is described in terms of implementation methods, not each implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole. The technical solutions in the various embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for measuring the liquid level of a molten salt heat storage tank, characterized in that: include: A mounting block (4), a distance measuring device (5), a track rod (6), a floating plate (7), a dynamic air curtain protection component and an operation output unit; wherein, The mounting block (4) is used to be mounted on the top of a molten salt heat storage tank whose liquid level is to be measured, and the mounting block (4) is integrated with the distance measuring device (5); wherein the distance measuring device (5) includes a laser distance measuring unit and a microwave radar distance measuring unit; The track rod (6) is used to be vertically installed in a molten salt heat storage tank whose liquid level is to be measured; wherein, the two ends of the track rod (6) are respectively installed on the bottom of the molten salt heat storage tank whose liquid level is to be measured and on the mounting block (4); The floating plate (7) is used to be arranged in a molten salt heat storage tank whose liquid level is to be measured, and is slidably mounted on the track rod (6); The dynamic air curtain protection component is used to form a protective air curtain near the distance measuring device (5) during the liquid level measurement process; The operation output unit is used to obtain the collected data of the laser ranging unit and the microwave radar ranging unit, and calculate and output the liquid level height value of the molten salt heat storage tank using a weighted average algorithm; wherein the collected data is the distance value between the floating plate (7) and the ranging device (5).

2. The device for measuring the liquid level of a molten salt heat storage tank according to claim 1, characterized in that: The laser ranging unit and the microwave radar ranging unit are symmetrically arranged with respect to the central axis of the molten salt heat storage tank whose liquid level height is to be measured.

3. The device for measuring the liquid level of a molten salt heat storage tank according to claim 1, characterized in that: The dynamic air curtain protection component includes a plurality of nozzles; wherein the plurality of nozzles are arranged in a ring around the distance measuring device (5); each nozzle is connected to a gas delivery pipeline, and the gas delivery pipeline is provided with a gas drying and filtering device and a pressure regulating valve.

4. The device for measuring the liquid level of a molten salt heat storage tank according to claim 1, characterized in that: The surface of the track rod (6) is coated with a wear-resistant coating.

5. The device for measuring the liquid level of a molten salt heat storage tank according to claim 1, characterized in that: The bottom edge of the floating plate (7) is provided with an oblique opening, and the floating plate (7) is provided with a self-correcting sliding block.

6. The device for measuring the liquid level of a molten salt heat storage tank according to claim 1, characterized in that: In the calculation output unit, the steps of obtaining the collected data of the laser ranging unit and the microwave radar ranging unit and calculating and outputting the liquid level height value of the molten salt heat storage tank by using a weighted average algorithm include: Performing temperature gradient compensation correction on the acquired data of the laser ranging unit to obtain corrected data; performing dynamic dielectric constant calibration on the acquired data of the microwave radar ranging unit to obtain calibrated data; Based on the corrected and calibrated data, a weighted average algorithm is used to calculate the output molten salt heat storage tank liquid level value; the weight distribution is adjusted according to the environmental signal-to-noise ratio.

7. The device for measuring the liquid level of a molten salt heat storage tank according to claim 6, characterized in that: In the step of performing temperature gradient compensation correction on the acquired data of the laser ranging unit to obtain the corrected data, the compensation coefficient is obtained based on an array of temperature difference sensors arranged in the height direction of the tank body of the molten salt heat storage tank to be measured for liquid level.

8. The device for measuring the liquid level of a molten salt heat storage tank according to claim 6, characterized in that: In the step of dynamically calibrating the dielectric constant of the acquired data of the microwave radar ranging unit to obtain the calibrated data, the calibration parameters are generated based on the molten salt temperature-density relationship model.

9. A molten salt heat storage tank, characterized in that: A device for measuring the liquid level height of a molten salt heat storage tank according to any one of claims 1 to 8 is provided.

10. A method for operating the device for measuring the liquid level of a molten salt heat storage tank according to claim 1, characterized in that: The following steps are involved: The mounting block (4) is mounted on the top of the molten salt heat storage tank whose liquid level height is to be measured, and the track rod (6) is vertically mounted in the molten salt heat storage tank whose liquid level height is to be measured; wherein the two ends of the track rod (6) are respectively mounted on the bottom of the molten salt heat storage tank whose liquid level height is to be measured and on the mounting block (4); the floating plate (7) is slidably mounted on the track rod (6); The laser distance measuring unit and the microwave radar distance measuring unit in the distance measuring device (5) are used to collect and obtain the distance value between the floating plate (7) and the distance measuring device (5); wherein, during the distance value collection process, a protective air curtain is formed near the distance measuring device (5) by a dynamic air curtain protection component; The distance value data collected by the laser ranging unit and the microwave radar ranging unit are obtained through the calculation output unit, and the weighted average algorithm is used to calculate the output molten salt heat storage tank liquid level height value.

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