Novel sinking storage tank with low liquid level area and fused salt storage tank of novel sinking storage tank

Abstract

The utility model belongs to the technical field of energy storage equipment, and discloses a novel sinking storage tank with a low liquid level area and a fused salt storage tank of the novel sinking storage tank, the novel sinking storage tank comprises a small sinking tank body, a heat tracing band, a heat preservation layer, a flexible support, a temperature detection assembly and a control assembly, the temperature detection assembly is arranged on the outer wall of the small sinking tank body, and the heat preservation layer is arranged outside the small sinking tank body. A heat tracing band is further installed between the heat preservation layer and the small sinking tank body, a flexible support is arranged at the bottom of the small sinking tank body, a gap exists between the small sinking tank body and the flexible support when the small sinking tank body is cooled, and the heat tracing band and the temperature detection assembly are electrically connected with the control assembly.

Description

Technical Field

[0001] This utility model belongs to the field of energy storage equipment technology, specifically relating to a new type of submerged storage tank in a low liquid level zone and its molten salt storage tank. Background Technology

[0002] Molten salt tanks are crucial energy storage devices in the operation of concentrated solar power (CSP) plants. However, many existing molten salt tanks are vertical cylindrical domed molten salt tanks combined with vertical submersible long-shaft molten salt pumps. Because the vertical submersible long-shaft molten salt pumps require a minimum liquid level, a certain liquid level must be maintained at the bottom of the tank during operation, creating a dead salt zone. This dead salt zone prevents the molten salt from effectively participating in the heat exchange cycle, reducing the actual energy storage efficiency of the tank. Long-term accumulation can also cause localized condensation and deterioration of the molten salt, affecting the stable operation and lifespan of the entire CSP plant and increasing maintenance costs.

[0003] Currently, by installing a submerged low-level tank at the bottom of the molten salt storage tank, a low-level zone is created locally at the bottom of the tank to address the problem of dead salt areas. However, the following issues remain: 1. Because the submerged low-level tank is located at the bottom of the molten salt storage tank, the temperature is difficult to detect accurately, easily leading to localized areas of excessively low temperature causing molten salt solidification; 2. When the existing submerged low-level tank is filled with high-temperature molten salt, the tank expands and deforms significantly. Currently, there is no effective support at the bottom of the tank, resulting in a reduced lifespan of the submerged low-level tank, increased susceptibility to leaks, and difficulty in effectively detecting leaks; 3. Existing submerged low-level tanks are generally concentrated in one area at the bottom of the tank, causing uneven stress on the tank and leading to deformation towards the low-level zone. This area experiences higher stress, affecting the overall structural uniformity and lifespan of the tank.

[0004] Therefore, developing a new type of molten salt storage tank with a low liquid level zone has great market potential. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of the prior art and to provide a new type of submerged storage tank for low liquid level zones and its molten salt storage tank.

[0006] To solve the technical problem, the technical solution of this utility model is: a novel submerged storage tank for low liquid level zones, comprising a submerged tank body, a heating tape, an insulation layer, a flexible support, a temperature detection component, and a control component. The temperature detection component is installed on the outer wall of the submerged tank body, and an insulation layer is installed on the outside of the submerged tank body. A heating tape is also installed between the insulation layer and the submerged tank body. A flexible support is installed at the bottom of the submerged tank body, and a gap exists between the submerged tank body and the flexible support when the submerged tank body is cooled. The heating tape and the temperature detection component are electrically connected to the control component.

[0007] Preferably, the temperature detection assembly comprises a first temperature sensor, a second temperature sensor and a third temperature sensor, the first temperature sensor is three, the three first temperature sensors are evenly distributed on the upper side of the outer wall of the sunken small tank body in the circumferential direction, the second temperature sensor is three, the three second temperature sensors are evenly distributed on the middle position of the outer wall of the sunken small tank body in the circumferential direction, the third temperature sensor is three, the three third temperature sensors are evenly distributed on the bottom position of the outer wall of the sunken small tank body in the circumferential direction, and the first temperature sensor, the second temperature sensor and the third temperature sensor are electrically connected with the control assembly respectively.

[0008] Preferably, the heat preservation layer is fixed on the outside of the sunken small tank body by a clamp.

[0009] Preferably, a plurality of tank bases are arranged at the bottom of the sunken small tank body, the number of flexible supports is the same as the number of tank bases, the flexible support comprises an upper support, a spring and a lower support, the top of the spring is connected with the upper support, the bottom of the spring is connected with the lower support, the upper support corresponds to the position of the tank base, and there is a gap between the top of the upper support and the bottom of the tank base when the sunken small tank body is cooled, and the lower support is fixed at the bottom of the sunken small tank body mounting groove.

[0010] Preferably, the size of the gap is 10-15mm, and the stiffness coefficient of the spring is 50-100kN / mm.

[0011] Preferably, a pressure sensor is arranged at the top of the upper support, and the pressure sensor is electrically connected with the control assembly.

[0012] Preferably, a leakage alarm assembly is arranged outside the heat preservation layer, the leakage alarm assembly comprises a detection optical fiber fixing support and a detection optical fiber, the detection optical fiber fixing support is arranged around the heat preservation layer, the detection optical fiber is spirally and uniformly wound on the detection optical fiber fixing support around the heat preservation layer and the bottom to form an optical fiber detection net, the pitch of the spiral is 80-100mm, and the detection optical fiber is electrically connected with the control assembly.

[0013] Preferably, a molten salt storage tank comprises the above-mentioned novel sunken storage tank with a low liquid level area, and further comprises a molten salt storage tank, a molten salt pump and a molten salt distribution assembly, the sunken small tank body is a plurality of, the plurality of sunken small tank bodies are evenly welded at the bottom of the molten salt storage tank, the sunken small tank body is communicated with the molten salt storage tank, the molten salt distribution assembly is arranged in the molten salt storage tank, the number of the molten salt pump is the same as that of the sunken small tank body, the molten salt pump is installed at the top of the molten salt storage tank, and the pump body of the molten salt pump penetrates through the molten salt storage tank to the sunken small tank body.

[0014] Preferably, the molten salt distribution assembly comprises a molten salt conveying pipe and a molten salt distribution ring, the molten salt conveying pipe extends into the molten salt storage tank from the top of the molten salt storage tank, the end of the molten salt conveying pipe is connected with the molten salt distribution ring, the center of the molten salt distribution ring is equidistant from the center of each sunken small tank body, and the molten salt distribution ring is uniformly provided with distribution openings, so that the molten salt can uniformly flow into each sunken small tank body.

[0015] Preferably, the sunken small tank body is four, and the four sunken small tank bodies are uniformly distributed at the bottom of the molten salt storage tank.

[0016] Compared with the prior art, the molten salt storage tank has the following advantages:

[0017] (1) The novel sunken storage tank of low liquid level area is provided with a heating tape outside the sunken small tank body, the heating tape is used for heat preservation of the molten salt in the sunken small tank body, and three groups of temperature sensors are arranged on the outer wall of the sunken small tank body from top to bottom, each group of temperature sensors is uniformly distributed in the circumferential direction, the temperature of the outer wall of the sunken small tank body is monitored in real time through the nine temperature sensors, the temperature signal of the temperature sensor and the power signal of the heating tape are connected to an external control assembly, the control assembly adjusts the heating power of the heating tape in real time according to the tank wall temperature fed back by the nine temperature sensors, so that the tank wall is maintained at a set temperature, and the phenomenon of solidification of the molten salt caused by excessively low temperature in the local area of the sunken small tank body is avoided, and the temperature uniformity is improved.

[0018] (2) The molten salt storage tank is provided with a heat preservation layer outside the sunken small tank body, the heat preservation layer is fixedly connected with the sunken small tank body through a clamp, and the heat preservation layer can freely expand and contract with the sunken small tank body when the sunken small tank body expands and contracts due to heat or cold.

[0019] (3) The molten salt storage tank is provided with a flexible support at the bottom of the sunken small tank body, so that the stability and safety of the tank body are ensured, the flexible support and the bottom of the sunken small tank body are kept a certain gap in a cold state, the tank body base is in contact with the flexible support after the sunken small tank body is filled with liquid molten salt and expands due to heat, the flexible support generates a certain supporting force on the tank body base, the stress state of the sunken small tank body is improved, and the overall stability of the sunken small tank body is improved.

[0020] (4) The molten salt storage tank is provided with a leakage alarm assembly outside the sunken small tank body, a detection optical fiber is uniformly wound in a spiral shape around the sunken small tank body and the bottom to form a detection optical fiber net through a detection optical fiber fixing support, if the molten salt in the sunken small tank body leaks, when the molten salt contacts the detection optical fiber, the temperature of the detection optical fiber changes sharply, at this time, the external control assembly connected with the detection optical fiber can judge the specific leakage position and the severity of the leakage, and then sends an alarm to the control system, so that necessary treatment measures can be taken, such as immediately starting the molten salt pump to pump out the molten salt in the tank body or taking necessary plugging measures, so as to reduce the loss caused by the leakage of the molten salt in the tank body.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a main view sectional structure schematic view of a molten salt storage tank of the utility model;

[0022] Figure 2 It is a top view structure schematic view of a molten salt storage tank of the utility model;

[0023] Figure 3 It is a utility model Figure 1 The partial enlarged view of the utility model;

[0024] Figure 4 It is a structure schematic view of a leakage alarm assembly of the utility model.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 1, molten salt storage tank, 2, molten salt pump, 3, molten salt distribution assembly, 4, sinking small tank body, 5, heat tracing band, 6, heat preservation layer, 7, flexible support, 8, first temperature sensor, 9, second temperature sensor, 10, third temperature sensor, 11, clamp, 12, pressure sensor, 13, leakage alarm assembly, 14, sinking small tank body installation groove;

[0027] 3-1, molten salt conveying pipe, 3-2, molten salt distribution ring;

[0028] 4-1, tank body base;

[0029] 7-1, upper support, 7-2, spring, 7-3, lower support;

[0030] 13-1, detection optical fiber fixed support, 13-2, detection optical fiber. DETAILED DESCRIPTION

[0031] The utility model will be described in detail below in connection with the drawings and specific embodiments, but the utility model is not only limited to these embodiments. The utility model covers any substitution, modification, equivalent method and scheme made on the essence and range of the utility model. In order to make the public have a thorough understanding of the utility model, specific details are explained in the following utility model embodiments, and the utility model can also be completely understood without the description of these details for those skilled in the art.

[0032] Example 1

[0033] As Figure 3As shown, the utility model discloses a novel low liquid level area's sinking storage tank, including sinking small jar body 4, heat -tracing band 5, heat -preserving layer 6, flexible support 7, temperature detection component and control component, sinking small jar body 4 outer wall is provided with temperature detection component, sinking small jar body 4 outside is provided with heat -preserving layer 6, heat -preserving layer 6 and sinking small jar body 4 between still are installed heat -tracing band 5, sinking small jar body 4 bottom is provided with flexible support 7, and there is a gap between sinking small jar body 4 cooling and flexible support 7, heat -tracing band 5 and temperature detection component are electrically connected with control component respectively.

[0034] Embodiment 2

[0035] As Figure 3 As shown, preferably, the temperature detection component includes first temperature sensor 8, second temperature sensor 9 and third temperature sensor 10, the first temperature sensor 8 is three, three first temperature sensor 8 is evenly distributed on the upper side position of the outer wall of the sinking small jar body 4 along the circumferential direction, the second temperature sensor 9 is three, three second temperature sensor 9 is evenly distributed in the middle position of the outer wall of the sinking small jar body 4 along the circumferential direction, the third temperature sensor 10 is three, three third temperature sensor 10 is evenly distributed in the bottom position of the outer wall of the sinking small jar body 4 along the circumferential direction, the first temperature sensor 8, the second temperature sensor 9 and the third temperature sensor 10 are electrically connected with the control component respectively.

[0036] The sinking small jar body 4 is externally mounted with the heat -tracing band 5, and the heat -tracing band 5 is mainly used for heat preservation to the molten salt in the sinking small jar body 4. Three groups of temperature sensors are arranged from top to bottom in the jar body, and each group is evenly distributed along the circumferential direction. The temperature of the outer wall of the sinking small jar body 4 is monitored in real time by the nine temperature sensors. The temperature signal of the temperature sensor and the power signal of the heat -tracing band are connected to the external control component. The control component adjusts the heating power of the heat -tracing band in real time according to the tank wall temperature feedback by the nine temperature sensors, so that the tank wall is maintained at a set temperature, thereby avoiding the phenomenon of molten salt solidification caused by the temperature of the local area of the sinking small jar body being too low.

[0037] The power density of the heat -tracing band 5 is 50~100W / m, which maintains the temperature uniformity of the sinking small jar body 4. Through closed-loop control with the tank wall temperature sensor, the tank body temperature difference can be controlled within ±5 DEG C, and additional stress caused by thermal gradient is reduced.

[0038] As Figure 3 As shown, preferably, the heat -preserving layer 6 is fixed on the outside of the sinking small jar body 4 by the clamp 11.

[0039] The heat -preserving layer 6 uses aluminum silicate heat -preserving cotton, and the heat -preserving cotton is fixed firmly with the sinking small jar body 4 by the clamp 11. When the sinking small jar body 4 expands and contracts with heat or cold, the heat -preserving layer 6 can freely expand and contract with the sinking small jar body 4. The heat -preserving layer 6 expands and contracts synchronously with the sinking small jar body 4 when the sinking small jar body 4 expands and contracts with heat or cold, so that the heat -preserving layer 6 is prevented from cracking and failing.

[0040] Embodiment 3

[0041] As Figure 3 shown, preferably, the bottom of the sunken small tank body 4 is provided with a plurality of tank body bases 4-1, the number of flexible supports 7 is the same as the number of tank body bases 4-1, the flexible support 7 includes an upper support 7-1, a spring 7-2 and a lower support 7-3, the top of the spring 7-2 is connected to the upper support 7-1, the bottom of the spring 7-2 is connected to the lower support 7-3, the upper support 7-1 corresponds to the position of the tank body base 4-1, and there is a gap between the top of the upper support 7-1 and the bottom of the tank body base 4-1 when the sunken small tank body 4 is cooled, and the lower support 7-3 is fixed at the bottom of the sunken small tank body mounting groove 14.

[0042] The flexible support 7 mainly plays a role in supporting the sunken small tank body 4, and ensures the stability and safety of the sunken small tank body 4. In the cold state, the flexible support 7 and the bottom of the sunken small tank body 4 leave a certain gap, and when the tank is full of liquid molten salt and expands and elongates, the tank base 4-1 contacts the flexible support 7, the flexible support 7 generates a certain supporting force on the tank base 4-1, improves the stress state of the sunken small tank body 4, and improves the overall stability of the tank. The middle of the flexible support 7 is provided with a spring, and the spring is selected according to the calculated supporting force to ensure that the selected spring can provide appropriate supporting force, and at the same time will not affect the flexibility and adaptability of the system due to excessive rigidity.

[0043] Preferably, the size of the gap is 10-15mm, which avoids additional stress caused by rigid constraint; the stiffness coefficient of the spring 7-2 is 50-100kN / mm, and the compression amount of the spring during thermal expansion can reach 5-10mm, which offsets more than 80% of the thermal stress.

[0044] As Figure 3 shown, preferably, the top of the upper support 7-1 is provided with a pressure sensor 12, and the pressure sensor 12 is electrically connected to the control assembly.

[0045] The pressure sensor 12 is arranged between the flexible support 7 and the sunken small tank body 4, when the tank is full of high-temperature molten salt, the sunken small tank body 4 expands and elongates and contacts the flexible support 7, the flexible support 7 provides a vertical upward supporting force for the sunken small tank body 4, and the pressure sensor 12 arranged between the sunken small tank body 4 and the flexible support 7 is used to detect the stress between them. When the pressure detected by the pressure sensor 12 exceeds 110% of the allowable value, an alarm will be sent out to remind the maintenance personnel to check and maintain and take emergency measures.

[0046] Embodiment 4

[0047] As Figure 4As shown, preferably, the heat preservation layer 6 is externally provided with a leakage alarm assembly 13, which comprises a detection optical fiber fixing support 13-1 and a detection optical fiber 13-2; the detection optical fiber fixing support 13-1 is arranged around the heat preservation layer 6, and the detection optical fiber 13-2 is spirally and uniformly wound on the detection optical fiber fixing support 13-1 around the heat preservation layer 6 and the bottom to form an optical fiber detection net, the pitch of the spiral being 80-100 mm, and the detection optical fiber 13-2 is electrically connected with a control assembly.

[0048] If the molten salt in the sinking small tank body 4 leaks, when the molten salt contacts the detection optical fiber 13-2, the temperature of the detection optical fiber 13-2 will change sharply. At this time, the control assembly connected with the detection optical fiber 13-2 can determine the specific leakage position and predict the severity of the leakage, and then send an alarm to the control system, so that necessary treatment measures can be taken, such as immediately starting the molten salt pump 2 to pump out the molten salt in the tank body or taking necessary plugging measures, etc., to reduce the loss caused by the leakage of the molten salt in the tank body.

[0049] Embodiment 5

[0050] As Figure 1 shown, preferably, a molten salt storage tank comprises the above-mentioned sinking tank with a new low liquid level area, and further comprises a molten salt storage tank 1, a molten salt pump 2 and a molten salt distribution assembly 3; the sinking small tank body 4 is multiple, and the multiple sinking small tank bodies 4 are uniformly welded at the bottom of the molten salt storage tank 1 and are in communication with the molten salt storage tank 1; the molten salt distribution assembly 3 is arranged in the molten salt storage tank 1; the number of the molten salt pump 2 is the same as that of the sinking small tank body 4, the molten salt pump 2 is installed at the top of the molten salt storage tank 1, and the pump body of the molten salt pump 2 penetrates through the molten salt storage tank 1 to the sinking small tank body 4.

[0051] The molten salt storage tank 1 is a spherical dome vertical cylindrical structure, and the tank wall, the tank top and the heat preservation of the molten salt storage tank 1 are consistent with those of a conventional tank body. The sinking small tank body 4 is arranged at the bottom of the molten salt storage tank 1 according to requirements, so as to locally reduce the liquid level of the tank bottom of the molten salt storage tank 1 and create the required liquid level condition for the operation of the molten salt pump 2, thereby reducing the storage amount of the molten salt at the bottom of the molten salt storage tank 1 to the maximum extent.

[0052] The molten salt storage tank 1 is a spherical dome vertical cylindrical structure, and the tank wall, the tank top and the heat preservation of the molten salt storage tank 1 are consistent with those of a conventional tank body. The sinking small tank body 4 is arranged at the bottom of the molten salt storage tank 1 according to requirements, so as to locally reduce the liquid level of the tank bottom of the molten salt storage tank 1 and create the required liquid level condition for the operation of the molten salt pump 2, thereby reducing the storage amount of the molten salt at the bottom of the molten salt storage tank 1 to the maximum extent.

[0053] The molten salt pump 2 is a vertical under-liquid long-shaft molten salt pump, which is installed at the top of the molten salt storage tank 1 and the pump body of which penetrates through the cavity of the molten salt storage tank 1 to the sinking small tank body 4.

[0054] AsFigure 2 As shown, preferably, the molten salt distribution assembly 3 includes a molten salt delivery pipe 3-1 and a molten salt distribution ring 3-2, the molten salt delivery pipe 3-1 extends into the molten salt storage tank 1 from the top of the molten salt storage tank 1, the end of the molten salt delivery pipe 3-1 is connected to the molten salt distribution ring 3-2, the center of the molten salt distribution ring 3-2 is the same distance from the center of each sunken small tank body 4, and the molten salt distribution ring 3-2 is uniformly provided with distribution openings, so that the molten salt can uniformly flow into each sunken small tank body 4.

[0055] The molten salt distribution assembly 3 uniformly distributes the openings on the molten salt distribution ring 3-2, so that the molten salt can uniformly flow into each sunken small tank body 4. This uniform distribution helps to prevent the formation of a temperature gradient in the storage tank, thereby maintaining a consistent temperature throughout the storage tank.

[0056] As shown in the drawings, Figure 2 Preferably, the sunken small tank body 4 is four, and the four sunken small tank bodies 4 are evenly distributed at the bottom of the molten salt storage tank 1.

[0057] The sunken small tank body 4 adopts a thickened design and a circular arc transition structure at the key stress part of the tank body, and can be separately manufactured and welded to the bottom of the molten salt storage tank 1. The design diameter and height of the sunken small tank body 4 are determined according to the lowest liquid level requirement of the vertical submerged long-shaft molten salt pump, wherein one specification has a diameter of 1.5 meters, a height of 2 meters, a wall thickness of 40 mm, and a transition zone arc radius of 0.3 meters.

[0058] Manufacturing method: integral molding by centrifugal casting, increasing the overall strength of the tank body, reducing the risk of fatigue cracking at the welding site, and improving the local strength by more than 30%.

[0059] The uniform and symmetrical distribution of the plurality of sunken small tank bodies 4 enables the stress at the bottom of the molten salt storage tank 1 to be uniformly distributed, avoiding stress concentration. The problem of stress deformation and structural instability of the tank body caused by the shear force at the junction of the tank bottom and the bottom of the tank side wall is solved due to the uneven distribution of molten salt, which causes the molten salt storage tank 1 to deform as a whole towards the low liquid level area. The inner diameter and height of the tank body meet the minimum liquid level requirement when the molten salt pump 2 is running.

[0060] The molten salt storage tank 1 and the sunken small tank body 4 are made of the same material and have the same thermal expansion coefficient, avoiding the thermal deformation difference caused by connecting different materials.

[0061] The working principle of the utility model is as follows:

[0062] As shown in the drawings, Figure 3 , 4As shown, this utility model discloses a novel submerged storage tank for low liquid levels, comprising a submerged tank body 4, a heating cable 5, an insulation layer 6, a flexible support 7, a temperature detection component, and a control component. A temperature detection component is installed on the outer wall of the submerged tank body 4, and the heating cable 5 and insulation layer 6 are installed on the outside of the submerged tank body 4. The control component adjusts the heating power of the heating cable in real time based on the tank wall temperature feedback from the temperature detection component, maintaining the tank wall at a set temperature. A flexible support 7 is installed at the bottom of the submerged tank body 4 to support the thermally expanding submerged tank body 4. Furthermore, a leakage alarm component 13 is installed on the outside of the submerged tank body 4 to alarm for leakage. This utility model provides real-time detection of the temperature uniformity, stress state, and leakage status of the submerged tank body 4, improving the safety and reliability of the molten salt storage tank and reducing operation and maintenance costs.

[0063] like Figure 1 , 2 As shown, this utility model discloses a molten salt storage tank. Multiple sinking tanks 4 are evenly arranged at the bottom of the molten salt storage tank 1. The molten salt pump 2 is installed in the sinking tank 4. Taking advantage of the characteristic that molten salt sinks due to gravity, the liquid molten salt in the molten salt storage tank 1 will first collect in the sinking tank 4. After the sinking tank 4 is full of liquid molten salt, the liquid level in the molten salt storage tank 1 will gradually rise. Since the suction pump shaft of the molten salt pump is placed inside the sinking tank 4, it can deliver most or even all of the liquid molten salt in the molten salt storage tank 1.

[0064] This utility model discloses a novel submerged storage tank for low liquid levels. A heating cable is installed on the outside of the submerged tank to insulate the molten salt inside. Simultaneously, three sets of temperature sensors are arranged from top to bottom on the outer wall of the submerged tank, with three temperature sensors evenly distributed in each set along the circumference. The temperature of the outer wall of the submerged tank is monitored in real time by the nine temperature sensors. The temperature signals from the temperature sensors and the power signals from the heating cable are both connected to an external control component. The control component adjusts the heating power of the heating cable in real time based on the tank wall temperature feedback from the nine temperature sensors, so that the tank wall is maintained at the set temperature. This avoids the solidification of molten salt caused by excessively low temperatures in local areas of the submerged tank and improves temperature uniformity.

[0065] This utility model has an insulation layer on the outside of the sinking tank. The insulation layer is firmly fixed to the sinking tank with a clamp. When the sinking tank expands and contracts due to heat, the insulation layer can expand and contract freely together with the sinking tank.

[0066] The utility model discloses a flexible support is arranged at the bottom of sinking small jar body, guarantees the stability and security of jar body, and the flexible support and sinking small jar body bottom keep certain gap under cold state, when sinking small jar body is full of liquid molten salt thermal expansion elongation, jar body base contacts with flexible support, and flexible support produces certain support force to jar body base, improves the stress state of sinking small jar body, improves the overall stability of sinking small jar body.

[0067] The utility model discloses a leakage alarm subassembly is set up outside sinking small jar body, and the detection optical fiber is spirally and uniformly wound and forms a fiber detection net in sinking small jar body four around and bottom through the detection optical fiber fixed support, if molten salt in sinking small jar body leaks, when molten salt contacts detection optical fiber, the temperature of detection optical fiber will change sharply, and the external control component connected with detection optical fiber can judge the specific leakage position and judges the severity of leakage and sends alarm to control system, so as to take necessary treatment measures, such as immediately starting molten salt pump and taking necessary plugging measures, etc.

[0068] The above preferred embodiments of the utility model are described in detail, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the utility model.

[0069] Many other changes and modifications can be made without departing from the spirit and scope of the utility model. It should be understood that the utility model is not limited to the specific embodiments, and the scope of the utility model is defined by the appended claims.

Claims

1. A novel submerged storage tank for low liquid level zones, characterized in that: The device includes a submerged tank (4), a heating cable (5), an insulation layer (6), a flexible support (7), a temperature detection component, and a control component. The temperature detection component is installed on the outer wall of the submerged tank (4), and an insulation layer (6) is installed on the outside of the submerged tank (4). A heating cable (5) is also installed between the insulation layer (6) and the submerged tank (4). A flexible support (7) is installed at the bottom of the submerged tank (4). There is a gap between the submerged tank (4) and the flexible support (7) when the submerged tank (4) is cooled. The heating cable (5) and the temperature detection component are electrically connected to the control component.

2. The novel submerged storage tank for low liquid level zones according to claim 1, characterized in that: The temperature detection component includes a first temperature sensor (8), a second temperature sensor (9), and a third temperature sensor (10). There are three first temperature sensors (8), which are evenly distributed along the circumference on the upper side of the outer wall of the sinking tank (4). There are three second temperature sensors (9), which are evenly distributed along the circumference in the middle of the outer wall of the sinking tank (4). There are three third temperature sensors (10), which are evenly distributed along the circumference at the bottom of the outer wall of the sinking tank (4). The first temperature sensor (8), the second temperature sensor (9), and the third temperature sensor (10) are electrically connected to the control component.

3. The novel submerged storage tank for low liquid level zones according to claim 1, characterized in that: The insulation layer (6) is fixed to the outside of the sinking tank (4) by clamps (11).

4. A novel submerged storage tank for low liquid level zones according to claim 1, characterized in that: The bottom of the sinking tank (4) is provided with multiple tank bases (4-1). The number of flexible supports (7) is the same as the number of tank bases (4-1). The flexible support (7) includes an upper support (7-1), a spring (7-2) and a lower support (7-3). The top of the spring (7-2) is connected to the upper support (7-1), and the bottom of the spring (7-2) is connected to the lower support (7-3). The upper support (7-1) is positioned opposite to the tank base (4-1). When the sinking tank (4) is cooled, there is a gap between the top of the upper support (7-1) and the bottom of the tank base (4-1). The lower support (7-3) is fixed at the bottom of the sinking tank mounting groove (14).

5. A novel submerged storage tank for low liquid level zones according to claim 4, characterized in that: The gap is 10-15 mm in size, and the stiffness coefficient of the spring (7-2) is 50-100 kN / mm.

6. A novel submerged storage tank for low liquid level zones according to claim 4, characterized in that: A pressure sensor (12) is provided on the top of the upper support (7-1), and the pressure sensor (12) is electrically connected to the control component.

7. A novel submerged storage tank for low liquid level zones according to claim 1, characterized in that: The insulation layer (6) is provided with a leakage alarm component (13). The leakage alarm component (13) includes a detection fiber fixing bracket (13-1) and a detection fiber (13-2). The detection fiber fixing bracket (13-1) is set around the insulation layer (6). The detection fiber (13-2) is spirally and evenly wound around the detection fiber fixing bracket (13-1) around the insulation layer (6) and at the bottom to form a fiber detection network. The pitch of the spiral is 80~100mm. The detection fiber (13-2) is electrically connected to the control component.

8. A molten salt storage tank, characterized in that: The invention includes a novel submerged storage tank for a low liquid level zone as described in any one of claims 1 to 7, and further includes a molten salt storage tank (1), a molten salt pump (2), and a molten salt distribution assembly (3). There are multiple submerged small tanks (4), which are uniformly welded to the bottom of the molten salt storage tank (1) and are connected to the molten salt storage tank (1). The molten salt distribution assembly (3) is disposed inside the molten salt storage tank (1). The number of molten salt pumps (2) is the same as the number of submerged small tanks (4). The molten salt pumps (2) are installed on the top of the molten salt storage tank (1), and the pump body of the molten salt pumps (2) passes through the molten salt storage tank (1) to the submerged small tanks (4).

9. A molten salt storage tank according to claim 8, characterized in that: The molten salt distribution assembly (3) includes a molten salt conveying pipe (3-1) and a molten salt distribution ring (3-2). The molten salt conveying pipe (3-1) extends from the top of the molten salt storage tank (1) into the interior of the molten salt storage tank (1). The end of the molten salt conveying pipe (3-1) is connected to the molten salt distribution ring (3-2). The center of the molten salt distribution ring (3-2) is the same distance from the center of each sinking small tank (4). The molten salt distribution ring (3-2) is uniformly provided with distribution openings so that the molten salt can flow into each sinking small tank (4) evenly.

10. A molten salt storage tank according to claim 8, characterized in that: There are four sinking tanks (4), which are evenly distributed at the bottom of the molten salt storage tank (1).

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