Molten salt heat storage and release device for snakelike coil pipe heat exchange
By installing a serpentine coil on the outer wall of the molten salt heat storage and release device tank, and combining it with the discharge port, discharge pipe and temperature monitoring unit, the problem of uneven temperature distribution of molten salt was solved, the heat release capacity and system efficiency were improved, and the maintenance difficulty and leakage risk were reduced.
Patent Information
- Application Number
- CN202520505561.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-21
AI Technical Summary
In existing molten salt heat storage and release devices, the molten salt temperature distribution is uneven during the heat storage and release process, resulting in insufficient utilization of the upper molten salt heat release capacity. Furthermore, the serpentine coils installed inside the tank are difficult to maintain and pose a risk of leakage.
The design incorporates a serpentine coil on the outer wall of the tank, with a discharge port and discharge pipe installed on it. Combined with a second serpentine coil and a temperature monitoring unit, the flow rate difference is adjusted. The mixing uniformity of the molten salt is improved through the stirring assembly, and a magnetic coupling is used to connect the stirring shaft and the drive motor.
It improves the utilization of the molten salt's heat release capacity, reduces the difficulty of installing serpentine coils and the risk of leakage, extends the service life, and improves the system's heat exchange efficiency and safety.
Smart Images
Figure CN223925522U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of molten salt heat storage and release equipment, and in particular to a molten salt heat storage and release device with serpentine coil heat exchange. Background Technology
[0002] A molten salt heat storage and release device exists, comprising a molten salt tank, an electric heating unit, and heat exchange pipes. The molten salt tank is filled with molten salt, and the electric heating unit is inserted into the molten salt from the top of the tank to heat the molten salt. The heat exchange pipes are spiral-shaped, including an inlet near the bottom of the molten salt tank and an outlet near the top. When a cryogenic fluid enters the heat exchange pipes from the inlet, it exchanges heat with the high-temperature molten salt inside the tank, thereby transforming the cryogenic fluid into a high-temperature, high-pressure fluid, which is then discharged from the outlet of the heat exchange pipes.
[0003] In a molten salt heat storage and release device, during heat storage, the electric heating unit heats the molten salt to melting point. The density of the molten salt decreases as the temperature increases; the higher the temperature, the lower the density. As the heating process continues, the higher-temperature, lower-density molten salt rises, while the lower-temperature, higher-density molten salt sinks. Furthermore, heat is transferred upwards from the lower molten salt, causing heat to concentrate in the upper part of the tank. When the upper molten salt reaches its maximum operating temperature, the electric heating unit stops operating. However, at this point, the temperature of the lower molten salt in the tank remains relatively low, resulting in a temperature distribution within the tank that is higher at the top and lower at the bottom.
[0004] When the molten salt heat storage and release device releases heat, the feedwater in the heat exchange pipe enters from the bottom and exits from the top. The heat exchange pipe consists of a preheating section, a boiling section, and a superheating section from bottom to top. The heat transfer coefficient, heat transfer temperature difference, and heat transfer capacity of the preheating section and the boiling section are significantly higher than those of the superheating section. Therefore, the temperature of the molten salt in the lower part of the molten salt tank decreases faster than that in the upper part. This also reinforces the characteristic of the molten salt temperature distribution in the tank being higher at the top and lower at the bottom, resulting in a lower utilization rate of the heat release capacity of the molten salt in the upper part of the tank. Utility Model Content
[0005] To address the aforementioned problems, this application provides a molten salt heat storage and release device using a serpentine coil heat exchanger. The device is ingeniously designed and has a simple structure. In this application, the first serpentine coil serves as the heat exchange pipe, enabling simultaneous cooling of molten salt at different heights during heat release, thereby enhancing the utilization of the molten salt's heat release capacity and improving the system's heat exchange efficiency. By placing the first serpentine coil on the outer wall of the tank, compared to placing it inside the tank, the installation difficulty of the first serpentine coil is reduced. This also minimizes losses caused by leaks in the first serpentine coil and facilitates its inspection and maintenance. Furthermore, by providing a discharge port on the first serpentine coil, residual fluid can be completely discharged during the non-heat-release phase of the molten salt, ensuring the safety of the heat exchange pipe (first serpentine coil). The technical solution adopted in this application is as follows:
[0006] A molten salt heat storage and release device with serpentine coil heat exchange, comprising:
[0007] The tank body is suitable for filling molten salt thermal storage material; a first serpentine coil includes an inlet, an outlet, and a serpentine section, the inlet and the outlet being connected to both ends of the serpentine section, the serpentine section including several vertical sections and several bent sections, the vertical sections and the bent sections being alternately connected vertically along the height direction of the tank body, the serpentine section being disposed on the outer wall of the tank body and surrounding the outer periphery of the tank body, the serpentine section being used to transfer heat from the tank body to the fluid to be heated in the serpentine section; a discharge port is provided at the lowest point of several bent sections near the bottom of the tank body, the discharge port being used to discharge residual fluid in the serpentine section; an electric heating device is vertically inserted into the molten salt thermal storage material in the tank body, the electric heating device being used to heat the molten salt thermal storage material.
[0008] The first serpentine coil, acting as a heat exchange pipe, can simultaneously reduce the cooling rate of molten salt at different heights during molten salt exothermic reactions, thereby enhancing the utilization of the molten salt's exothermic capacity and improving the system's heat exchange efficiency. By placing the first serpentine coil on the outer wall of the tank, compared to placing it inside the tank, the installation difficulty is reduced, losses caused by leaks are minimized, and maintenance is facilitated. This application incorporates a drain port on the first serpentine coil, allowing residual fluid to be completely drained during the non-exothermic phase of the molten salt, ensuring the safety of the heat exchange pipe (first serpentine coil).
[0009] In some embodiments, the molten salt heat storage and release device further includes a discharge pipe, wherein all discharge ports are connected to the discharge pipe to recover and reuse the fluid discharged from the discharge ports.
[0010] By installing discharge pipes, each discharge port is connected to the discharge pipe and the discharge ports are connected in parallel. During the non-exothermic phase of the molten salt, the fluid remaining in the first serpentine coil can be collected and reused through the discharge pipes. For example, the fluid collected by the discharge pipes can be transported to an insulated water storage tank for use as a water source for the first serpentine coil or other heat exchange pipes, or the fluid collected by the discharge pipes can be discharged elsewhere to avoid the direct discharge of the fluid remaining in the first serpentine coil to the site.
[0011] In some embodiments, the discharge pipe is inclined in the horizontal direction to facilitate the discharge of fluid from the discharge pipe.
[0012] By tilting the discharge pipe horizontally, it is easier for the fluid entering the discharge pipe from the discharge port to be discharged smoothly, and to prevent the fluid from stagnating in the discharge pipe.
[0013] In some embodiments, the vertical section and the bent section are connected by an expansion joint.
[0014] By setting expansion joints to connect the vertical and bent sections, it is beneficial to reduce the adverse effects of water hammer impact from high-temperature and high-pressure steam on the first serpentine coil, reduce the local stress of the first serpentine coil, and extend the service life of the first serpentine coil.
[0015] In some embodiments, the height of the outlet of the first serpentine coil is not lower than that of the inlet.
[0016] In some embodiments, the inlet of the first serpentine coil is located near the bottom of the tank.
[0017] In some embodiments, the molten salt heat storage and release device further includes a second serpentine coil, which is distributed at different heights along the height direction of the tank, with the second serpentine coil located above the first serpentine coil.
[0018] By installing a second serpentine coil positioned entirely above the first serpentine coil, effectively dividing the tank into at least two sections along its height—with the first coil located on the lowest section and the second coil on the other sections—the heat transfer efficiency of the system can be improved by adjusting the flow rate difference between the two coils. This allows for more even utilization of the heat released by the molten salt at different depths, enhancing the overall heat exchange efficiency. For example, molten salt at higher elevations in the tank is generally hotter than that at lower elevations. By setting the flow rate of the second coil to be greater than that of the first coil, the cooling rate of the molten salt at higher elevations can be accelerated, ensuring a more balanced utilization of the heat from the molten salt at different heights (or depths).
[0019] In some embodiments, the tank is provided with temperature monitoring units at different heights (depths), and the temperature monitoring units include at least an upper temperature monitoring unit and a lower temperature monitoring unit. The position of the lower temperature monitoring unit corresponds to the first serpentine coil, and the position of the upper temperature monitoring unit corresponds to the second serpentine coil.
[0020] By arranging temperature monitoring units at different heights along the tank's height, the lower unit monitors the molten salt temperature corresponding to the first serpentine coil, while the upper unit monitors the molten salt temperature corresponding to the second serpentine coil. The temperature values and differences fed back by the lower and upper units can serve as key parameters for adjusting the flow rate difference between the first and second serpentine coils. The placement of temperature monitoring units at different heights within the tank ensures the accuracy and timeliness of temperature data acquisition.
[0021] In some embodiments, the molten salt heat storage and release device further includes a stirring assembly, which includes a stirring shaft and a drive motor. The stirring shaft is rotatably inserted into the molten salt heat storage material in a vertical direction from the top of the tank body. The upper end of the stirring shaft is exposed outside the tank body, and the drive motor is fixed to the upper end of the stirring shaft.
[0022] By setting up a stirring component, the mixing of molten salt in the tank can be facilitated, such as the mixing of outer layer molten salt and core layer molten salt, or the mixing of molten salt at different depths, which helps to improve the utilization of the molten salt's heat storage capacity and heat release capacity.
[0023] In some embodiments, the stirring assembly further includes a magnetic coupling, through which the stirring shaft and the drive motor are driven.
[0024] By using a magnetic coupling, a soft connection (magnetic connection) is achieved between the stirring shaft and the drive motor, which can also be described as a non-contact connection. This avoids heat conduction between the stirring shaft and the drive motor, reducing the risk of overheating damage to the drive motor.
[0025] The molten salt heat storage and release device with serpentine coil heat exchange provided in this application has at least one of the following beneficial effects:
[0026] 1. This application provides a molten salt heat storage and release device using a serpentine coil heat exchanger. The first serpentine coil, acting as a heat exchange pipe, can simultaneously reduce the cooling rate of molten salt at different heights during heat release, thereby improving the utilization of the molten salt's heat release capacity and increasing the system's heat exchange efficiency. By placing the first serpentine coil on the outer wall of the tank, compared to placing it inside the tank, the installation difficulty of the first serpentine coil is reduced. This also minimizes losses caused by leaks in the first serpentine coil and facilitates its inspection and maintenance. Furthermore, by providing a discharge port on the first serpentine coil, residual fluid in the coil can be completely discharged during the non-heat release phase of the molten salt, ensuring the safety of the heat exchange pipe (first serpentine coil).
[0027] 2. The molten salt heat storage and release device for serpentine coil heat exchange provided in this application, by setting up a discharge pipe, with each discharge port connected to the discharge pipe and the discharge ports connected in parallel to each other. During the non-exothermic stage of the molten salt, the fluid remaining in the first serpentine coil can be collected and recovered through the discharge pipe and utilized. For example, the fluid collected by the discharge pipe can be transported to an insulated water storage tank for use as a water source for the first serpentine coil or other heat exchange pipes, or the fluid collected by the discharge pipe can be discharged to another location to avoid the direct discharge of the fluid remaining in the first serpentine coil to the site.
[0028] 3. The molten salt heat storage and release device with serpentine coil heat exchange provided in this application, by setting the discharge pipe inclined in the horizontal direction, facilitates the smooth discharge of fluid entering the discharge pipe from the discharge port and avoids fluid stagnation in the discharge pipe.
[0029] 4. The molten salt heat storage and release device for serpentine coil heat exchange provided in this application, by setting an expansion joint and using the expansion joint to connect the vertical section and the bending section, helps to reduce the adverse effects of water hammer impact of high temperature and high pressure steam on the first serpentine coil, reduce the local stress of the first serpentine coil, and extend the service life of the first serpentine coil.
[0030] 5. This application provides a molten salt heat storage and release device using a serpentine coil heat exchanger. By setting a second serpentine coil, with the entire second serpentine coil positioned above the first serpentine coil, the tank is divided into at least two sections along its height. The first serpentine coil is located on the lowest section of the tank, while the second serpentine coil is located on sections at other heights. This allows for the adjustment of the flow rate difference between the first and second serpentine coils, enabling the even utilization of heat from molten salt at different depths, thereby improving the utilization of the molten salt's heat release capacity and increasing the system's heat exchange efficiency. For example, molten salt at higher levels within the tank is generally hotter than molten salt at lower levels. By setting the flow rate of the second serpentine coil to be greater than that of the first serpentine coil, the cooling rate of the molten salt at higher levels can be relatively accelerated, ensuring that the heat from molten salt at different heights (or depths) is utilized evenly.
[0031] 6. This application provides a molten salt heat storage and release device with serpentine coil heat exchange. Temperature monitoring units at different heights are arranged along the height of the tank. The lower temperature monitoring unit monitors the molten salt temperature corresponding to the first serpentine coil, and the upper temperature monitoring unit monitors the molten salt temperature corresponding to the second serpentine coil. The temperature values and differences fed back by the lower and upper temperature monitoring units can serve as key parameters for adjusting the flow rate difference between the first and second serpentine coils. The placement of temperature monitoring units at different heights within the tank ensures the accuracy and timeliness of temperature data acquisition.
[0032] 7. The molten salt heat storage and release device with serpentine coil heat exchange provided in this application can facilitate the mixing of molten salt in the tank by setting a stirring component, such as the mixing of outer layer molten salt and core layer molten salt, or the mixing of molten salt at different depths, which is conducive to improving the utilization of molten salt heat storage capacity and molten salt heat release capacity.
[0033] 8. The molten salt heat storage and release device with serpentine coil heat exchange provided in this application achieves a soft connection (magnetic connection) between the stirring shaft and the drive motor by using a magnetic coupling, which can also be described as a non-contact connection. This avoids heat conduction between the stirring shaft and the drive motor and reduces the risk of overheating damage to the drive motor. Attached Figure Description
[0034] The preferred embodiments will be described below in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a molten salt heat storage and release device with serpentine coil heat exchange:
[0035] Figure 1 This is a schematic diagram of the structure of an embodiment of the molten salt heat storage and release device of this application;
[0036] Figure 2 This is a schematic diagram of another embodiment of the molten salt heat storage and release device of this application;
[0037] Figure 3 This is a schematic diagram of another embodiment of the molten salt heat storage and release device of this application, wherein the molten salt heat storage and release device includes a second serpentine coil;
[0038] Figure 4 This is a schematic diagram of another embodiment of the molten salt heat storage and release device of this application, wherein the discharge pipe is directly connected to the insulated water storage tank.
[0039] Explanation of icon numbers:
[0040] Tank body 1, first serpentine coil 2, inlet 3, outlet 4, serpentine section 5, vertical section 6, bending section 7, discharge port 8, discharge pipe 9, expansion joint 10, second serpentine coil 11, electric heating device 12, insulated water storage tank 13, steam distribution cylinder 14, upper temperature monitoring unit 15, lower temperature monitoring unit 16. Detailed Implementation
[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.
[0042] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."
[0043] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0044] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0045] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0046] refer to Figures 1-4 This application provides a molten salt heat storage and release device with serpentine coil heat exchange, comprising: a tank 1, the tank 1 being suitable for filling molten salt heat storage material; a first serpentine coil 2, including an inlet 3, an outlet 4, and a serpentine section 5, the inlet 3 and outlet 4 being respectively connected to the two ends of the serpentine section 5, the serpentine section 5 including several vertical sections 6 and several bent sections 7, the vertical sections 6 and bent sections 7 being alternately connected vertically along the height direction of the tank 1, the serpentine section 5 being disposed on the outer wall of the tank 1 and surrounding the outer periphery of the tank 1, the serpentine section 5 being used to transfer the heat of the tank 1 to the fluid to be heated in the serpentine section 5; a discharge port 8 being provided at the lowest point of several bent sections 7 near the bottom of the tank 1, the discharge port 8 being used to discharge the fluid remaining in the serpentine section 5; and an electric heating device 12, the electric heating device 12 being vertically inserted into the molten salt heat storage material in the tank 1, the electric heating device 12 being used to heat the molten salt heat storage material.
[0047] Understandably, the first serpentine coil 2, as a heat exchange pipe, can simultaneously reduce the cooling rate of molten salt at different heights during molten salt exothermic reactions, thereby improving the utilization of the molten salt's exothermic capacity and increasing the system's heat exchange efficiency. By placing the first serpentine coil 2 on the outer wall of the tank 1, compared to placing it inside the tank 1, the installation difficulty of the first serpentine coil 2 is reduced. This also minimizes losses caused by leaks in the first serpentine coil 2 and facilitates its inspection and maintenance. This application provides a discharge port 8 on the first serpentine coil 2, allowing residual fluid in the first serpentine coil 2 to be completely discharged during the non-exothermic phase of the molten salt, ensuring the safety of the heat exchange pipe (first serpentine coil 2).
[0048] refer to Figures 1-4 In one embodiment, the molten salt heat storage and release device further includes a discharge pipe 9, and discharge ports 8 are all connected to the discharge pipe 9 to recover and reuse the fluid discharged from the discharge ports 8.
[0049] refer to Figure 4 In one specific embodiment, the molten salt heat storage and release device also includes an insulated water tank 13. The insulated water tank 13 provides a water source for the heat exchange pipes (including the first serpentine coil 2) on the one hand, and the fluid collected by the drain pipe flows directly back into the insulated water tank 13 to be used as a water source for the first serpentine coil 2 or other heat exchange pipes on the other hand.
[0050] It is easy to understand that by setting up the discharge pipe 9, all discharge ports 8 are connected to the discharge pipe 9, and the discharge ports 8 are connected in parallel with each other. During the non-exothermic stage of the molten salt, the fluid remaining in the first serpentine coil 2 can be collected and utilized through the discharge pipe 9. For example, the fluid collected by the discharge pipe 9 can be transported to the insulated water storage tank 13 to be used as a water source for the first serpentine coil 2 or other heat exchange pipes, or the fluid collected by the discharge pipe 9 can be discharged to another location to avoid the fluid remaining in the first serpentine coil 2 being directly discharged to the site.
[0051] refer to Figures 1-4 In one embodiment, the discharge pipe 9 is inclined in the horizontal direction to facilitate the discharge of fluid in the discharge pipe 9. By inclining the discharge pipe 9 in the horizontal direction, it is beneficial to facilitate the discharge of fluid entering the discharge pipe 9 from the discharge port 8 and to prevent fluid from stagnating in the discharge pipe 9.
[0052] It should be noted that the reference Figures 1-4 In one embodiment, the vertical section 6 and the bent section 7 are connected by an expansion joint 10. By setting the expansion joint 10 and connecting the vertical section 6 and the bent section 7, it is beneficial to reduce the adverse effects of the water hammer impact of high-temperature and high-pressure steam on the first serpentine coil 2, reduce the local stress of the first serpentine coil 2, and extend the service life of the first serpentine coil 2.
[0053] refer to Figures 1-4 In one embodiment, the height of the outlet 4 of the first serpentine coil 2 is not lower than that of the inlet 3.
[0054] refer to Figure 1 In one specific embodiment, the inlet 3 of the first serpentine coil 2 is located near the bottom of the tank 1, while the outlet 4 of the first serpentine coil 2 is located near the top of the tank 1. This arrangement is suitable for tanks 1 with smaller dimensions. (See reference...) Figure 2 In another specific embodiment, the inlet 3 of the first serpentine coil 2 is located near the middle of the tank body 1, while the outlet 4 of the first serpentine coil 2 is located near the top of the tank body 1.
[0055] refer to Figure 3 , Figure 4 In one embodiment, the molten salt heat storage and release device further includes a second serpentine coil 11, which and the first serpentine coil 2 are distributed at different heights along the height direction of the tank body 1, with the second serpentine coil 11 located above the first serpentine coil 2.
[0056] Specifically, the outlet 4 of the first serpentine coil 2 and the outlet of the second serpentine coil 11 are both connected to the steam distribution cylinder 14, and the first serpentine coil 2 and the second serpentine coil 11 are connected in parallel. Apart from the difference in height, the second serpentine coil 11 does not have a discharge port 8. This is because the molten salt temperature corresponding to the second serpentine coil 11 is usually higher than that of the first serpentine coil 2. In other words, the fluid in the second serpentine coil 11 is fully vaporized, with no residual liquid fluid, and therefore, a discharge port 8 is generally unnecessary.
[0057] It is worth noting that by setting a second serpentine coil 11, with the second serpentine coil 11 entirely above the first serpentine coil 2, the tank 1 is divided into at least two sections along its height. The first serpentine coil 2 is located on the lowest section of the tank 1, while the second serpentine coil 11 is located on other sections. This allows for the adjustment of the flow rate difference between the first serpentine coil 2 and the second serpentine coil 11, enabling the even utilization of heat from molten salt at different depths, thus improving the utilization of the molten salt's heat release capacity and increasing the system's heat exchange efficiency. For example, molten salt at higher levels in the tank 1 is generally hotter than molten salt at lower levels. By setting the flow rate of the second serpentine coil 11 to be greater than that of the first serpentine coil 2, the cooling rate of the molten salt at higher levels can be relatively accelerated, ensuring that the heat from molten salt at different heights (or depths) is utilized evenly.
[0058] refer to Figure 3 , Figure 4In one embodiment, the tank 1 is provided with temperature monitoring units at different heights. The temperature monitoring units include at least an upper temperature monitoring unit 15 and a lower temperature monitoring unit 16. The position of the lower temperature monitoring unit 16 corresponds to the first serpentine coil 2, and the position of the upper temperature monitoring unit 15 corresponds to the second serpentine coil 11.
[0059] It is understandable that by arranging temperature monitoring units at different heights along the height of the tank, the lower temperature monitoring unit 16 monitors the molten salt temperature corresponding to the first serpentine coil 2, and the upper temperature monitoring unit 15 monitors the molten salt temperature corresponding to the second serpentine coil 11. The temperature values and temperature differences fed back by the lower temperature monitoring unit 16 and the upper temperature monitoring unit 15 can serve as key parameters for adjusting the flow rate difference between the first serpentine coil 2 and the second serpentine coil 11. The placement of temperature monitoring units at different heights within the tank 1 ensures the accuracy and timeliness of temperature data acquisition.
[0060] In one embodiment, the molten salt heat storage and release device further includes a stirring assembly (not shown in the figure). The stirring assembly includes a stirring shaft and a drive motor. The stirring shaft is rotatably inserted vertically into the molten salt heat storage material from the top of the tank, with its upper end exposed outside the tank. The drive motor is fixed to the upper end of the stirring shaft. By providing the stirring assembly, the mixing of molten salt within the tank can be facilitated, such as the mixing of the outer layer and the core layer of molten salt, or the mixing of molten salt at different depths, thereby improving the utilization of the molten salt's heat storage and release capabilities.
[0061] In one embodiment, the stirring assembly further includes a magnetic coupling, through which the stirring shaft and the drive motor are driven. By employing a magnetic coupling, a soft connection (magnetic connection) is achieved between the stirring shaft and the drive motor, which can also be described as a non-contact connection. This avoids heat conduction between the stirring shaft and the drive motor, reducing the risk of overheating damage to the drive motor.
[0062] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A molten salt heat storage and release device with serpentine coil heat exchange, characterized in that, include: Tank body, the tank body being suitable for being filled with molten salt thermal storage material; The first serpentine coil includes an inlet, an outlet, and a serpentine section. The inlet and the outlet are respectively connected to the two ends of the serpentine section. The serpentine section includes several vertical sections and several bent sections. The vertical sections and the bent sections are alternately connected vertically along the height direction of the tank. The serpentine section is provided on the outer wall of the tank and surrounds the outer periphery of the tank. The serpentine section is used to transfer the heat of the tank to the fluid to be heated in the serpentine section. A discharge port is provided at the lowest point of several of the bends near the bottom of the tank body, and the discharge port is used to discharge the fluid remaining in the serpentine section; An electric heating device is inserted vertically into the molten salt thermal storage material inside the tank, and the electric heating device is used to heat the molten salt thermal storage material.
2. The molten salt heat storage and release device with serpentine coil heat exchange according to claim 1, characterized in that, It also includes a discharge pipe, to which all discharge ports are connected, so as to recycle the fluid discharged from the discharge ports.
3. The molten salt heat storage and release device with serpentine coil heat exchange according to claim 2, characterized in that, The discharge pipe is inclined in the horizontal direction to facilitate the discharge of fluid from the pipe.
4. The molten salt heat storage and release device with serpentine coil heat exchange according to claim 1, characterized in that, The vertical section and the bent section are connected by an expansion joint.
5. The molten salt heat storage and release device with serpentine coil heat exchange according to claim 1, characterized in that, The height of the outlet of the first serpentine coil is not lower than that of the inlet.
6. A molten salt heat storage and release device for serpentine coil heat exchange according to claim 5, characterized in that, The inlet of the first serpentine coil is located near the bottom of the tank.
7. The molten salt heat storage and release device for serpentine coil heat exchange according to claim 1, characterized in that, It also includes a second serpentine coil, which is distributed at different heights along the height direction of the tank, with the second serpentine coil located above the first serpentine coil.
8. A molten salt heat storage and release device for serpentine coil heat exchange according to claim 7, characterized in that, The tank is equipped with an upper temperature monitoring unit and a lower temperature monitoring unit. The lower temperature monitoring unit is located in a position corresponding to the first serpentine coil, and the upper temperature monitoring unit is located in a position corresponding to the second serpentine coil.
9. A molten salt heat storage and release device for serpentine coil heat exchange according to any one of claims 1-8, characterized in that, It also includes a stirring assembly, which includes a stirring shaft and a drive motor. The stirring shaft is rotatably inserted into the molten salt thermal storage material in a vertical direction from the top of the tank body. The upper end of the stirring shaft is exposed outside the tank body, and the drive motor is fixed to the upper end of the stirring shaft.
10. A molten salt heat storage and release device for serpentine coil heat exchange according to claim 9, characterized in that, The stirring assembly also includes a magnetic coupling, through which the stirring shaft and the drive motor are driven.