Molten Salt Leak Detection System, Flue Gas-Molten Salt Heat Exchange System, Molten Salt Leak Detection Method

Abstract

The present application provides a molten salt leakage detection system, a flue gas molten salt heat exchange system, and a molten salt leakage detection method. The molten salt leakage detection system includes a barrel and a first detection element. The inlet of the barrel can be directly or indirectly connected to the flue downstream of the flue gas molten salt heat exchanger. The first detection element is used to detect to obtain the actual weight of the material in the barrel. It further includes a control unit. The first detection element is connected to the control unit. The control unit can judge whether the molten salt leaks into the flue according to the volume of the material in the barrel and the actual weight of the material in the barrel. This application can improve the accuracy of molten salt leakage detection.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas heat exchange, and specifically relates to a molten salt leakage detection system, a flue gas molten salt heat exchange system, and a molten salt leakage detection method. Background Art

[0002] Please refer to Figure 4 , Figure 4 which is a schematic diagram of a flue gas molten salt heat exchange system.

[0003] The flue gas molten salt heat exchange system includes a flue gas molten salt heat exchanger 300', and the flue gas molten salt heat exchanger 300' is a key device for converting the heat energy of flue gas into the heat energy of molten salt. As Figure 4 shown, high-temperature flue gas enters the flue gas molten salt heat exchanger 300', and exchanges heat with the cold molten salt that also enters. The heated molten salt is hot molten salt, which can enter the molten salt tank for storage, and the cooled outlet flue gas flows into the flue 400'. The flue 400' is connected to a hopper 100', and the hopper 100' is connected to an ash conveying system 200'. The ash conveying system 200' conveys the dust collected by the hopper 100'.

[0004] Due to the characteristics of high temperature, strong corrosiveness of the molten salt medium and immature existing manufacturing technologies, the flue gas molten salt heat exchanger may experience molten salt leakage during operation. The leaked molten salt will enter the hopper of the flue together with the dust in the flue gas, and then cause blockage of the ash conveying system. The process of molten salt leakage occurs in a closed flue, and the leaked molten salt is difficult to be directly observed, and other methods are needed for detection.

[0005] The detection methods related to molten salt leakage include thermocouple temperature measurement, temperature sensing cable temperature measurement, electrode plates, and array circuit measurement. These detection methods are mainly for the leakage of molten salt storage tanks.

[0006] Among them, for thermocouple temperature measurement and temperature sensing cable temperature measurement technologies, the thermocouple and temperature sensing cable are arranged on the outer peripheral surface of the molten salt storage tank. When molten salt leaks, the temperature at the leakage position is relatively high, so as to detect whether leakage occurs through the temperature change, that is, to judge the molten salt leakage situation by using the temperature difference between the leaked molten salt and the ambient temperature. However, since the temperature of the leaked molten salt from the flue gas molten salt heat exchanger is similar to the temperature of the dust in the hopper, it is unreliable to judge the molten salt leakage situation through the weak temperature difference between the two, and it is easy to cause misjudgment of molten salt leakage.

[0007] Among them, for electrode plate and array circuit measurement technologies, both use the conductivity of the leaked molten salt to judge the molten salt leakage. Since the leaked molten salt will be mixed with the dust in the hopper, and the dust is usually an insulator, this will affect the accuracy of the electrode plate or array circuit measurement, and it is also easy to cause misjudgment of molten salt leakage.

[0008] Therefore, for the molten salt leakage of the flue gas molten salt heat exchanger, how to detect it more accurately is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0009] The purpose of this application is to provide a molten salt leakage detection system, a flue gas molten salt heat exchange system, and a molten salt leakage detection method, which can improve the accuracy of molten salt leakage detection.

[0010] The molten salt leakage detection system provided by this application includes a hopper and a first detection element. The inlet of the hopper can be directly or indirectly connected to the flue downstream of the flue gas molten salt heat exchanger. The first detection element is used to detect to obtain the actual weight of the material in the hopper. It also includes a control unit. The first detection element is connected to the control unit, and the control unit can judge whether the molten salt leaks into the flue according to the volume of the material in the hopper and the actual weight of the material in the hopper.

[0011] In a specific embodiment, the flue gas molten salt heat exchange system includes an ash hopper connected to the flue. The inlet of the hopper is connected to the outlet of the ash hopper through a flexible connection, and a first control valve is arranged between the inlet of the hopper and the outlet of the ash hopper. It also includes a bearing component, and the bearing component is used to bear the hopper, and the first detection element is arranged between the hopper and the bearing component.

[0012] In a specific embodiment, it also includes a second detection element. The second detection element is used to detect the height of the material in the ash hopper or the hopper. The second detection element is connected to the control unit, and the control unit can obtain the volume of the material in the hopper according to the height and the shape of the ash hopper or the hopper.

[0013] In a specific embodiment, the hopper has an outlet for connecting to the ash conveying system, and a second control valve is arranged at the outlet of the hopper. The second control valve is connected to the control unit.

[0014] In a specific embodiment, the bearing component supports the hopper, and the first detection element includes a pressure sensor; or, the bearing component suspends the hopper, and the first detection element includes a tension sensor.

[0015] In a specific embodiment, the inlet of the hopper is used to be directly connected to the flue through a flexible connection. It also includes a bearing component, and the bearing component is used to bear the hopper, and the first detection element is arranged between the hopper and the bearing component.

[0016] This application also provides a flue gas molten salt heat exchange system, including a flue gas molten salt heat exchanger, a flue downstream of the flue gas molten salt heat exchanger, and the molten salt leakage detection system according to any one of the above.

[0017] The present application also provides a molten salt leakage detection method, including:

[0018] Providing a barrel, the inlet of the barrel being directly or indirectly connected to the flue downstream of the flue gas molten salt heat exchanger;

[0019] Detecting to obtain the actual weight of the material in the barrel and obtaining the volume of the material in the barrel;

[0020] Assuming that all the material in the barrel is dust, according to the bulk density of the dust and the volume of the material detected in the barrel, obtaining the predicted weight of the material in the barrel;

[0021] Comparing the predicted weight with the obtained actual weight, and judging whether the molten salt leaks into the flue according to the actual weight and the predicted weight.

[0022] In a specific embodiment, a preset range of the difference in weight or the ratio of weight is set. When the actual weight is greater than the predicted weight and the difference or ratio between the two exceeds the preset range, it is judged that molten salt leakage occurs; when the difference or ratio between the actual weight and the predicted weight is within the preset range, it is judged that no molten salt leakage occurs.

[0023] In a specific embodiment, the barrel has an outlet for communicating with the ash conveying system. If it is judged that molten salt leakage occurs, the outlet of the barrel is controlled to be closed.

[0024] In a specific embodiment, the inlet of the barrel is connected to the outlet of the ash hopper directly connected to the flue. When the actual weight is less than the predicted weight and the difference or ratio is less than the preset range, it is judged that the ash hopper is blocked.

[0025] In a specific embodiment, the preset range is the range of the ratio of the actual weight to the predicted weight, the upper limit value of the preset range is greater than 1, and the lower limit value of the preset range is less than 1.

[0026] In this application, the leakage phenomenon of the flue gas molten salt heat exchanger is converted into a measurable signal, that is, a direct or indirect signal for measuring the actual weight of the barrel. Then, by using the bulk density of the dust and the density difference between the molten salt-dust mixed material, the actual weight of the material in the barrel is compared with the predicted weight of the material without molten salt incorporated, so as to realize the detection of molten salt leakage of the flue gas molten salt heat exchanger, which has the advantages of low cost, high accuracy and wide adaptability. The molten salt leakage detection method and the flue gas molten salt heat exchange system have the same technical effects and will not be elaborated here. Brief Description of the Drawings

[0027] Figure 1 This is the schematic diagram of the flue gas molten salt heat exchange system in the embodiment of the present application;

[0028] Figure 2 is Figure 1 the structural schematic diagram of the molten salt leakage detection system in;

[0029] Figure 3 the schematic diagram of the areas of material height, material mass and whether there is leakage;

[0030] Figure 4 is the schematic diagram of a flue gas molten salt heat exchange system.

[0031] The descriptions of the reference numerals in the above-mentioned drawings are as follows:

[0032] 100 - Molten salt leakage detection system; 200 - Ash conveying system; 300 - Flue gas molten salt heat exchanger; 400 - Flue;

[0033] 1 - Ash hopper; 2 - Second detection element; 3 - Control unit; 4 - First control valve; 5 - Hose; 6 - Cylinder; 7 - Second control valve; 8 - First detection element; 9 - Bearing component;

[0034] 100’ - Ash hopper; 200’ - Ash conveying system; 300’ - Flue gas molten salt heat exchanger; 400 - Flue. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0036] Please refer to Figure 1 , Figure 1 which is the schematic diagram of the flue gas molten salt heat exchange system in the embodiment of the present application.

[0037] The flue gas molten salt heat exchange system includes a flue gas molten salt heat exchanger 300 as shown in Figure 1 . The inside of the flue gas molten salt heat exchanger 300 has two circuits. The inlet flue gas enters the flue gas molten salt heat exchanger 300 from the inlet of one circuit. The inlet flue gas is generally high-temperature flue gas. The cold molten salt enters the flue gas molten salt heat exchanger 300 from the inlet of the other circuit. The high-temperature flue gas and the cold molten salt can conduct heat exchange inside the flue gas molten salt heat exchanger 300. The heated molten salt is hot molten salt and can enter the molten salt tank for storage to achieve the purpose of heat storage. The cooled outlet flue gas (the temperature is generally, for example, 320 °C) flows into the flue 400. The flue 400 is located downstream of the flue gas molten salt heat exchanger 300. The flue 400 is connected to a molten salt leakage detection system 100. The flue gas molten salt heat exchange system may further include an ash conveying system 200. The dust and the like contained in the flue gas in the flue 400 can be collected and then discharged into the ash conveying system 200 for transportation.

[0038] As Figure 2 shown Figure 2 is Figure 1 a schematic structural diagram of the molten salt leakage detection system 100 in

[0039] In the molten salt leakage detection system 100 of this embodiment, it includes a barrel 6 and a first detection element 8. The barrel 6 has an inlet, and the inlet of the barrel 6 is directly or indirectly connected to the flue 400 downstream of the flue gas molten salt heat exchanger 300. Then, dust and the like in the flue 400 can enter the barrel 6. In this embodiment, the flue gas molten salt heat exchange system includes a hopper 1. The hopper 1 is directly connected to the flue 400, and the inlet of the barrel 6 is connected to the outlet of the hopper 1, and thus is indirectly connected to the flue 400. The hopper 1 is fixedly connected to the flue 400 through fastening connectors such as flanges, or is fixed to the flue 400 by welding. It can be arranged below the flue 400. The flue 400 is provided with an opening to dock with the inlet of the hopper 1. In this way, dust and the like in the flue 400 can automatically fall into the hopper 1 under the action of gravity and be collected by the hopper 1.

[0040] The molten salt leakage detection system 100 further includes a first detection element 8. The first detection element 8 is used to detect to obtain the actual weight of the material in the barrel 6, that is, it can directly detect the actual weight of the material, or can detect parameters related to the actual weight and calculate the actual weight through calculation. As mentioned above, dust in the flue 400 can fall into the barrel 6. The material in the barrel 6 is mainly dust. If the molten salt leaks, the material also includes molten salt, that is, the actual weight detected of the material may be the weight of the dust or the weight of the mixed material of dust and molten salt.

[0041] The type of the first detection element 8 is not limited. For example, it is a pressure sensor. At this time, the parameter related to the actual weight detected is pressure, and the pressure can be converted into the actual weight. As Figure 2 shown, the molten salt leakage detection system 100 further includes a bearing member 9. The bearing member 9 is specifically a support column in this embodiment. A plurality of support columns distributed along the circumferential direction of the barrel 6 can be provided to support the barrel 6 relatively stably. The first detection element 8 can be arranged between the bearing member 9 and the barrel 6. Figure 2 In , the bearing member 9 is supported on the ground or other foundation platforms. One end of the first detection element 8 is connected to the upper end of the barrel 6, and the other end is connected to the upper end of the bearing member 9. It can be known that the connection relationship between the bearing member 9 and the barrel 6 is not limited to this. For example, the lower end of the barrel 6 can also be supported on the bearing member. The bearing member can be integrated with a pressure sensor, and the bearing member can also be integrated with a calculation unit to directly convert the pressure value detected by the pressure sensor into the actual weight, similar to a weighing scale.

[0042] When the barrel 6 and the ash hopper 1 are set simultaneously, a flexible connection is adopted between the barrel 6 and the ash hopper 1. For example, the molten salt leakage detection system 100 further includes a hose 5, and the outlet of the ash hopper 1 and the inlet of the barrel 6 are connected through the hose 5. In this way, the ash hopper 1 does not bear the gravity of the barrel 6 and does not affect the first detection element 8 from detecting the weight of the barrel 6. It can be seen that the bearing member 9 is not limited to supporting the barrel 6 from bottom to top, and the barrel 6 can also be suspended, such as suspending the barrel 6 on an external structural foundation through a pull rod or a pull rope, etc., which is also a feasible solution. At this time, the first detection element 8 can also be a tension sensor, and the parameter related to the actual weight is the tension. Similarly, the tension sensor can output a tension signal and can also integrate a calculation unit to directly convert it into weight.

[0043] Assume that the weight of the empty barrel 6 is m 1 , m 1 is a known value, and the weight of the barrel 6 after the material enters is m 2 , m 2 is detected by the above-mentioned first detection element 8, then the actual weight m 测量 of the material in the barrel 6 measured is 2 = m 1 .

[0044] The molten salt leakage detection system 100 in this embodiment further includes a control unit 3. The first detection element 8 is connected to the control unit 3, and the connection with the control unit 3 can be through a wire or a wireless signal, and there is no limitation on this. In this way, the first detection element 8 can output the detected weight of the barrel 6 or other weight-related parameters (such as pressure or tension parameters) to the control unit 3 to calculate the actual weight of the material in the barrel 6. The control unit 3 can judge whether the molten salt leaks into the flue 400 according to the volume of the material in the barrel 6 and the actual weight of the material.

[0045] The embodiment of the present application also provides a molten salt leakage detection method, including:

[0046] Provide a barrel 6, and the inlet of the barrel 6 is directly or indirectly communicated with the flue 400;

[0047] Detect to obtain the actual weight m 测量 of the material in the barrel 6, and obtain the volume of the material in the barrel 6;

[0048] Assume that the material is all dust, and according to the density of the dust and the detected volume of the material, obtain the predicted weight m 预测 of the material in the barrel 6;

[0049] Compare the predicted weight m 预测 with the actually detected weight m 测量 , and according to the actual weight m 测量and the predicted weight m 预测 , to determine whether the molten salt leaks into the flue 400.

[0050] As can be seen from the above steps, the control unit 3 can calculate the predicted weight m of the material based on the volume of the material and the density of the dust stored in advance. 预测 , that is, in the case of no leakage, if the volume of the material in the barrel 6 is determined, the weight can also be determined. The density of the dust is usually known, or at least can be determined according to the actual working conditions. Specifically, the composition of the flue gas in the flue 400 is a known parameter, and the density of the dust in the flue gas can also be determined. In addition, it can also be obtained by detecting the actually collected dust. For example, the density of the dust is detected in the flue upstream of the flue gas molten salt heat exchanger 300. After actual measurement, if the control unit 3 finds that the actual weight m 测量 is greater than the predicted weight m 预测 , it indicates that the material is a mixed material doped with molten salt, because the density of the molten salt is greater than the density of the dust. For example, the density ρ 熔盐 of the molten salt is approximately 1841 kg / m³. Although the true density of the dust is generally about 2110 kg / m³, the bulk density of the dust is approximately 750 kg / m³. It should be known that the dust is piled up in a state with a certain porosity. When calculating the predicted weight m 预测 of the dust, the bulk density of the dust is used. The bulk density is much smaller than the density of the molten salt. Therefore, if the material in the barrel 6 is doped with molten salt, for the material with the same volume, the measured actual weight m 测量 will necessarily be greater than the predicted weight m 预测 .

[0051] The maximum density (ρ 混 ) max of the molten salt-dust mixed material 灰 = V 灰 [ρ 孔隙 (1 - φ 熔盐 ) + ρ 孔隙 φ 灰 , where V 孔隙 represents the volume of the material in the barrel 6, φ 混 is the porosity of the material, and ρ 灰 is always greater than the bulk density ρ

[0052] The molten salt leakage detection system in this embodiment converts the leakage phenomenon of the flue gas molten salt heat exchanger 300 into a measurable signal, that is, a direct or indirect signal for measuring the weight of the material in the barrel 6. By using the difference in the bulk density of the dust and the density of the molten salt-dust mixed material, the molten salt leakage detection of the flue gas molten salt heat exchanger 300 is realized, which has the advantages of low cost, high accuracy and wide adaptability.

[0053] It should be noted that in this embodiment, a material cylinder 6 independent of the ash hopper 1 is provided, and the material in the ash hopper 1 can be discharged into the material cylinder 6 to detect whether molten salt leakage occurs. In this way, it is also applicable to the existing flue gas molten salt heat exchange system fixedly connected with the ash hopper 1, and simple modification can be carried out to detect molten salt leakage; for the new equipment of the flue gas molten salt heat exchange system, the ash hopper 1 and the material cylinder 6 can be directly installed. When the material cylinder 6 and the ash hopper 1 are separately arranged, the installation, commissioning, disassembly and maintenance, and automation transformation of the material cylinder 6, etc., have no impact on the normal operation of the flue gas molten salt heat exchanger 300, the flue 400, and the ash hopper 1. That is, the molten salt leakage detection system 100 in this embodiment can be installed either at the beginning of the equipment design of the flue gas molten salt heat exchange system or during the equipment operation process, and has the advantages of easy implementation, simple installation, and convenient modification.

[0054] It can be understood that the material cylinder 6 is not limited to being arranged independently of the ash hopper 1. For example, the material cylinder 6 can also be directly connected to the flue 400, that is, the material cylinder 6 also functions as an ash hopper, and the material cylinder 6 is used as a component for collection and detection at the same time. At this time, in order to avoid the influence of the flue 400 on the weight detection of the material cylinder 6, the material cylinder 6 can be directly and flexibly connected to the flue 400, and the flue 400 is not affected by the gravity of the material cylinder 6, so the structure is simpler and more suitable for new equipment. In addition, according to the above description, setting the material cylinder 6 independently of the ash hopper 1 has stronger flexibility.

[0055] As Figure 2 shown, a first control valve 4 is provided between the outlet of the ash hopper 1 and the inlet of the material cylinder 6. When it is necessary to detect whether molten salt leaks, the first control valve 4 is opened, and the material in the ash hopper 1 can enter the material cylinder 6. After all the material in the ash hopper 1 enters the material cylinder 6, the first control valve 4 can be closed, and the ash hopper 1 can continue to collect dust without affecting the detection of the material in the material cylinder 6. Of course, the first control valve 4 can also not be provided, and the material in the ash hopper 1 can continuously enter the material cylinder 6. At this time, the leakage detection is more suitable for the working condition of non - continuous operation. When the flue gas molten salt heat exchanger 300 is not performing heat exchange work, the material in the material cylinder 6 can be directly detected. Moreover, even in continuous operation, since the collection of dust is usually a relatively slow process, within the detection time period, the amount of newly collected material is small and has no substantial impact on the detection. Only setting the first control valve 4 makes the detection result more accurate under the continuous operation working condition. The volume relationship between the material cylinder 6 and the ash hopper 1 is not limited. The material cylinder 6 can be larger than or equal to the volume of the ash hopper 1. In this way, the material in the ash hopper 1 can enter the ash hopper 1 without restriction. Of course, the volume of the material cylinder 6 can also be smaller than the volume of the ash hopper 1. At this time, during detection, if the material in the ash hopper 1 is full, only part of it can enter the material cylinder 6.

[0056] The volume of the barrel 6 is set to be relatively large and can be used as a buffer tank. Once molten salt leaks, the hopper 1 continues to collect dust, and the barrel 6 can temporarily store the dust mixed with molten salt. As Figure 1 shown, the barrel 6 in this embodiment has an outlet. The outlet of the barrel 6 is used to communicate with the ash conveying system 200 of the flue gas molten salt heat exchange system. A second control valve 7 is provided at the outlet of the barrel 6, and the second control valve 7 is connected to the control unit 3. When the control unit 3 determines that there is no molten salt leakage, it controls the second control valve 7 to open and sends the material in the barrel 6 into the ash conveying system 200. If it is determined that molten salt leakage occurs, the second control valve 7 is closed, and the flue gas molten salt heat exchanger 300 can be shut down for maintenance. At this time, the barrel 6 can be used as a buffer tank when molten salt leaks, preventing molten salt from entering the ash conveying system 200 and effectively avoiding clogging of the ash conveying system 200 by molten salt.

[0057] As Figure 2 shown, when determining whether molten salt leaks, it is necessary to know the volume of the material in the barrel 6. At this time, the molten salt leakage detection system 100 may further include a second detection element 2. The second detection element 2 is used to detect the height of the material in the hopper 1 or the barrel 6. The second detection element 2 is connected to the control unit 3, and the control unit 3 can obtain the volume of the material based on the detected height. The second detection element 2 is, for example, a level gauge, which is used to detect the height h of the material, and then calculate the volume of the material according to the geometric shape of the hopper 1 or the barrel 6. The second detection element 2 can directly detect the volume of the material in the hopper 1 and then discharge the material into the barrel 6, which is correspondingly the volume of the material in the barrel 6. It can also first discharge the material in the hopper 1 into the barrel 6 and then directly detect the volume of the material in the barrel 6 by the second detection element 2. Both methods can be achieved.

[0058] As a specific example, as Figure 2 shown, the second detection element 2 is used to detect the height h of the material in the hopper 1. The hopper 1 is a regular quadrangular frustum with a larger upper part and a smaller lower part, that is, the upper and lower openings of the hopper 1 are squares. As long as the side length of the square, the total height of the hopper 1, and the current height h of the material are known, the volume of the material can be calculated.

[0059] For example, the hopper 1 of the flue 400 is a regular quadrangular frustum with an upper opening side length of 2.11 m, a lower opening side length of 0.2 m, and a height of 1.36 m. The height h of the material in the hopper 1 is measured by means of the second detection element 2.

[0060] In this specific example, the actual weight m 预测 of the material in the hopper 1 预测 satisfies: m 3 = 600.75h 2 + 77.25h

[0061] The maximum density of the molten salt-dust mixture is (ρ 混 ) max :

[0062] (ρ 混 ) max =V 灰 [ρ 灰 (1-φ 孔隙 )+ρ 熔盐 φ 孔隙 =1937.84 kg / m³;

[0063] The density ρ of the molten salt-dust mixture 混 ∈(750, 1937.84], that is, the density of the mixture is always greater than the bulk density of the dust.

[0064] It can be understood that the calculation formula for the volume of the material is related to the bulk density of the dust and the geometric shape of the ash hopper 1, and is not limited to being calculated by the above formula. Given that the material cylinder 6 can be set to a regular geometric shape and the ash hopper 1 is usually also a regular geometric shape, the calculation of the volume of the material is relatively simple. The second detection element 2 is not limited to a level gauge. For example, a flow meter is set between the ash hopper 1 and the material cylinder 6. The flow meter, as the second detection element 2, can detect the material flow rate flowing into the material cylinder 6, and then calculate the volume of the material entering the material cylinder 6.

[0065] It can be combined with Figure 3 to understand that Figure 3 is a schematic diagram of the leakage judgment area. The abscissa is the height of the material, and the ordinate is the predicted weight of the material. The two curves respectively represent the upper limit value and the lower limit value of the preset range.

[0066] In this embodiment, a preset range can be set. The preset range can be a range of weight difference or a range of weight ratio. The preset range is stored in the control unit 3. When the actual weight m 测量 of the material is greater than the predicted weight m 预测 , and the difference or ratio between the two exceeds the preset range, it is determined that molten salt leakage has occurred. When the difference or ratio between the actual weight m 测量 and the predicted weight m 预测 is within the preset range, it is determined that no molten salt leakage has occurred. Specifically, the preset range is, for example, the ratio (0.9, 1.1), that is, the actual weight m 测量 is between 0.9 times and 1.1 times the predicted weight m 预测 , and the difference from the predicted weight m 预测 is not large, indicating that no leakage has occurred. When the actual weight m 测量It is within (0.9, 1.1) and between 1 times and 1.1 times, indicating that there is a small amount of molten salt leakage, but the leakage amount is small and will not affect the operation of the ash conveying system 200.

[0067] When the ash hopper 1 and the cartridge 6 are set simultaneously, if the actual weight m 测量 is less than the predicted weight m 预测 , and the difference or ratio is less than the preset range, it indicates that the ash discharge of the ash hopper 1 is not smooth and may be blocked. The second control valve 7 can be closed and the ash hopper 1 can be inspected. When the preset range is set as a ratio, the upper limit value of the above preset range is greater than 1 and the lower limit value is less than 1. Specifically, it is set to 0.9 in this embodiment, that is, it is also allowed that the actual weight m 测量 is less than the predicted weight m 预测 , but it is also restricted. The actual weight m 测量 can be slightly less than the predicted weight m 预测 . Although there may be a problem with the ash discharge of the ash hopper 1, the impact can be ignored and it will not affect the normal collection and discharge of dust. As Figure 3 shown, the lower curve is 0.9 times the predicted weight m 预测 , and the upper curve is 1.1 times the predicted weight m 预测 . The banded area enclosed between the two curves is the non-leakage area. According to the height of the material, it is determined whether the actual weight m 测量 falls within the non-leakage area. If it falls within, it is judged as non-leakage. If it falls above the upper curve, leakage occurs. If it falls below the lower curve, it is judged that the ash hopper 1 is blocked.

[0068] When the preset range is set as the difference, the upper limit value and the lower limit value are correspondingly specific weight values, which can be set according to the actual working conditions. The specific values of the preset range are not limited to the above examples and can be other values more in line with the actual working conditions. This embodiment will not list them one by one.

[0069] This embodiment also provides a flue gas molten salt heat exchange system including the above molten salt leakage detection system, as well as a molten salt leakage detection method, which has the same technical effects as the above embodiments and will not be elaborated here.

[0070] Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. Molten salt leakage detection system, characterized in that: It includes a barrel and a first detection element, the inlet of the barrel can be directly or indirectly connected to the flue downstream of the flue gas molten salt heat exchanger, and the first detection element is used for detection to obtain the actual weight of the material in the barrel; it also includes a control unit, the first detection element is connected to the control unit, and the control unit can judge whether the molten salt has leaked into the flue according to the volume of the material in the barrel and the actual weight of the material in the barrel.

2. The molten salt leakage detection system according to claim 1, characterized in that: The flue gas molten salt heat exchange system includes an ash hopper connected to a flue, wherein the inlet of the barrel is connected to the outlet of the ash hopper via a flexible connection, and a first control valve is arranged between the inlet of the barrel and the outlet of the ash hopper; the system also includes a bearing component, which is used to bear the barrel, and the first detection element is arranged between the barrel and the bearing component.

3. The molten salt leakage detection system according to claim 2, characterized in that: It also includes a second detection element, which is used to detect the height of the material in the ash hopper or the barrel. The second detection element is connected to the control unit, and the control unit can obtain the volume of the material in the barrel according to the height and the shape of the ash hopper or the barrel.

4. The molten salt leakage detection system according to claim 2, characterized in that: The barrel has an outlet for communicating with the ash conveying system. The outlet of the barrel is provided with a second control valve, and the second control valve is connected to the control unit.

5. The molten salt leakage detection system according to any one of claims 2 to 4, characterized in that: The bearing member supports the barrel, and the first detection element includes a pressure sensor; or the bearing member suspends the barrel, and the first detection element includes a tension sensor.

6. The molten salt leakage detection system according to claim 1, characterized in that: The inlet of the barrel is used for direct and flexible connection with the flue; the barrel also includes a bearing component, the bearing component is used for bearing the barrel, and the first detection element is arranged between the barrel and the bearing component.

7. Flue gas molten salt heat exchange system, characterized in that: It comprises a flue gas molten salt heat exchanger, a flue located downstream of the flue gas molten salt heat exchanger, and the molten salt leakage detection system according to any one of claims 1 to 6.

8. A molten salt leakage detection method, characterized in that: include: Providing a barrel, wherein the inlet of the barrel is directly or indirectly connected to the flue downstream of the flue gas molten salt heat exchanger; Detection to obtain the actual weight of the material in the barrel and the volume of the material in the barrel; Assuming that the material in the barrel is all dust, the predicted weight of the material in the barrel is obtained according to the bulk density of the dust and the detected volume of the material in the barrel; The predicted weight is compared with the obtained actual weight, and whether the molten salt has leaked into the flue is determined based on the actual weight and the predicted weight.

9. The molten salt leakage detection method according to claim 8, characterized in that: A preset range of the weight difference or weight ratio is set. When the actual weight is greater than the predicted weight and the difference or ratio between the two exceeds the preset range, it is determined that molten salt leakage has occurred; when the difference or ratio between the actual weight and the predicted weight is within the preset range, it is determined that no molten salt leakage has occurred.

10. The molten salt leakage detection method according to claim 9, characterized in that: The barrel has an outlet for communicating with the ash conveying system. If it is determined that molten salt leakage occurs, the outlet of the barrel is controlled to be closed.

11. The molten salt leakage detection method according to claim 9, characterized in that: The inlet of the barrel is connected to the outlet of the ash hopper directly connected to the flue, and when the actual weight is less than the predicted weight, and the difference or ratio is less than the preset range, it is determined that the ash hopper is blocked.

12. The molten salt leakage detection method according to claim 11, characterized in that: The preset range is a range of a ratio of the actual weight to the predicted weight, an upper limit value of the preset range is greater than 1, and a lower limit value of the preset range is less than 1.

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