A solar thermal storage tank

Abstract

This application relates to the field of thermal storage equipment, and more particularly to a solar thermal storage tank, comprising a tank body, an arched roof, and a tank bottom. The arched roof and tank bottom are respectively located at both ends of the tank body. A pump assembly is mounted on the arched roof. The pump assembly includes a motor, a pump pipe, and a pump body. The motor is fixed to the outer surface of the arched roof. The upper end of the pump pipe passes through the arched roof and is connected to the motor for transmission, while the lower end extends towards the tank bottom. A trough is located directly below the pump body at the tank bottom. A filter cartridge is installed in the trough, and the upper end of the filter cartridge is sealed to the lower end of the pump pipe. A dredging component is located inside the filter cartridge, and its dredging end is movable and extends into the pump body. Through the coordinated design of the filter cartridge and the dredging component, this application allows the filter cartridge to pre-filter impurities in the thermal storage medium, preventing large particles from entering the pump body. The dredging rod of the dredging component rotates eccentrically with a turntable, continuously agitating the pump body inlet to prevent the accumulation of fine impurities or crystalline salts, reducing downtime for maintenance and improving system operational stability.

Description

Technical Field

[0001] This application relates to the technical field of energy storage devices, and more particularly to a solar thermal energy storage tank. Background Technology

[0002] Solar thermal power generation technology, as an important direction for clean energy utilization, focuses on absorbing solar energy and converting it into thermal energy through a collector, and then storing the thermal energy through a thermal storage system to achieve continuous and stable power generation. The thermal storage tank, as the core equipment of the thermal storage system, is mainly used to store high-temperature thermal storage media (such as molten salt, heat transfer oil, etc.), and its performance directly affects the system's operating efficiency and stability.

[0003] In the existing technology, the heat storage medium in the heat storage tank may crystallize or be mixed with impurities, which can easily cause blockage of the feed inlet when it is pumped out, requiring frequent shutdowns for cleaning, affecting the continuity of the system. Furthermore, after the heat storage medium is pumped out, the heat storage medium remaining in the pump pipe needs to flow back into the tank, but blockage of the feed inlet will hinder the medium return and affect subsequent work. Utility Model Content

[0004] In order to reduce the blockage of the pump inlet and improve the working stability of the thermal storage tank, this application provides a solar thermal storage tank.

[0005] The solar thermal energy storage tank provided in this application adopts the following technical solution:

[0006] A solar thermal storage tank includes a tank body, an arched roof, and a tank bottom. The arched roof and tank bottom are respectively located at both ends of the tank body. A pump assembly is installed on the arched roof. The pump assembly includes a motor, a pump pipe, and a pump body. The motor is fixed to the outer surface of the arched roof. The upper end of the pump pipe passes through the arched roof and is connected to the motor for transmission, while the lower end extends towards the tank bottom. The pump body is connected to the lower end of the pump pipe and is internally connected. The tank bottom has a trough directly below the pump body. A filter cartridge is installed in the trough. The upper end of the filter cartridge is sealed to the lower end of the pump pipe. A dredging component is located inside the filter cartridge, and its dredging end is movable and extends into the pump body.

[0007] Optionally, the tank body and tank bottom are integrally formed, and the inner wall of the tank body and the upper surface of the tank bottom are sequentially covered with a refractory layer and a heat-resistant layer, wherein the refractory layer is attached to the inner wall surface of the tank body and the tank bottom, and the heat-resistant layer is attached to the inner side of the refractory layer and has the same coverage area as the refractory layer; the inner arc surface of the dome is provided with a heat-insulating layer, which completely covers the inner side of the dome and its edge is connected to the edge of the heat-resistant layer at the upper end of the tank body.

[0008] Optionally, the refractory layer is heat-insulating refractory bricks laid on the inner wall of the tank body and bottom, the heat-resistant layer is acid-resistant and heat-resistant bricks laid on the inner side of the refractory layer, and the heat-insulating layer is a refractory ceramic fiber blanket. The refractory ceramic fiber blanket is fixed to the inner arc surface of the arch by high-temperature resistant anchors.

[0009] Optionally, the unblocking assembly includes a driver, a turntable, and an unblocking rod. The driver is fixedly installed on the inner wall of the tank bottom by a bracket. The driving end of the driver faces the pump body and can rotate around its own axis. The output shaft of the driving end is fixedly connected to the center position of the turntable. One end of the unblocking rod is vertically fixed to the edge position of the turntable and is not coaxial with the turntable. The other end extends towards the pump body along the axial direction of the pump body.

[0010] Optionally, the unblocking assembly further includes a protective shell covering the drive and the turntable. The protective shell has a perforation, and a bearing is embedded in the perforation. The end of the unblocking rod away from the turntable passes through the bearing. A sealing groove is reserved on at least one end face of the bearing. A sealing gasket is press-fitted into the sealing groove, and the inner side of the sealing gasket abuts against the unblocking rod.

[0011] Optionally, a sealing plate is horizontally arranged at the upper end of the filter cartridge, and a through hole is opened in the middle of the sealing plate for the pump pipe to pass through. Flanges are respectively provided on the sealing plate and the pump pipe, and a high-temperature resistant sealing gasket is sandwiched between the two flanges.

[0012] Optionally, the tank body is also provided with an annular feeding pipe and electric heating rods. The annular feeding pipe is horizontally arranged on the upper surface of the heat-resistant layer at the bottom of the tank body. A feed pipe is connected to the outer peripheral wall of the feeding pipe. The lower end of the feed pipe is connected to the inside of the feeding pipe, and the upper end extends upward along the inner side wall of the tank body and passes through the reserved channel of the dome. The electric heating rods are evenly distributed along the circumference of the tank body.

[0013] In summary, this application includes at least one of the following beneficial technical effects:

[0014] 1. Through the coordinated design of the filter cartridge and the unblocking component, the filter cartridge can pre-filter impurities in the heat storage medium to prevent large particles from entering the pump body; the unblocking rod of the unblocking component rotates eccentrically with the turntable, continuously agitating the pump body inlet to prevent the accumulation of fine impurities or crystallized salt, solving the pump body blockage problem from the source, reducing the number of downtime maintenance and improving the stability of system operation. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of an embodiment of this application.

[0016] Figure 2 This is a frontal cross-sectional structural diagram of an embodiment of this application.

[0017] Figure 3 This is an embodiment of the present application. Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0018] Figure 4 This is an embodiment of the present application. Figure 2 Enlarged schematic diagram of the structure at point B.

[0019] Reference numerals: 1. Tank body; 2. Dome; 3. Tank bottom; 4. Refractory layer; 5. Heat-resistant layer; 6. Insulation layer; 7. Pump assembly; 71. Motor; 72. Pump pipe; 73. Pump body; 8. Filter cartridge; 81. Sealing plate; 82. Flange; 83. High-temperature resistant sealing gasket; 9. Unblocking assembly; 91. Driver; 92. Turntable; 93. Unblocking rod; 95. Protective shell; 96. Bearing; 97. Sealing gasket; 10. Annular distribution pipe; 11. Electric heating rod; 12. Feed pipe. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0021] This application discloses a solar thermal storage tank, mainly used for storing high-temperature thermal storage media (such as molten salt) in a solar thermal system. (See also...) Figure 1 The overall structure of the solar thermal storage tank includes a tank body 1, an arched roof 2, and a tank bottom 3. The arched roof 2 and the tank bottom 3 are fixed to the upper and lower ends of the tank body 1, respectively. The arched roof 2 is sealed to the upper edge of the tank body 1, and the tank bottom 3 is integrally formed with the lower edge of the tank body 1 to form a closed thermal storage space.

[0022] Due to the high temperature of the heat storage medium inside the tank (typically reaching 300℃-500℃), a refractory layer 4 and a heat-resistant layer 5 are sequentially installed on the inner walls and upper surface of the tank body 1 and tank bottom 3. The refractory layer 4 is laid in close contact with the inner walls of the tank body 1 and tank bottom 3, mainly serving as heat insulation. It is constructed using heat-insulating refractory bricks laid in a staggered pattern, with refractory mortar filling the brick joints to improve the overall heat insulation performance. The heat-resistant layer 5 is attached to the inner side of the refractory layer 4 and is in direct contact with the heat storage medium. It is constructed using acid-resistant and heat-resistant bricks, with the brick joints treated with high-temperature sealant, which can withstand high temperatures and resist the corrosion of the heat storage medium.

[0023] The inner arc surface of the dome 2 is provided with a heat insulation layer 6, which is made of refractory ceramic fiber blanket and fixed by high temperature resistant anchors. It completely covers the inner side of the dome 2, and the edge is connected to the edge of the heat-resistant layer 5 at the top of the tank body 1 to reduce heat loss from the top.

[0024] A pump assembly 7 is installed on the dome 2 to extract the heat storage medium inside the tank and transport it to an external heat exchange system. The pump assembly 7 consists of a motor 71, a pump pipe 72, and a pump body 73. The motor 71 is fixed to the outer surface of the dome 2, with its output shaft pointing vertically downwards. The upper end of the pump pipe 72 passes through a pre-set mounting hole in the dome 2 and is connected to the output shaft of the motor 71 via a coupling. The lower end extends along the axis of the tank body 1 towards the bottom 3 of the tank. The pump body 73 is connected to the lower end of the pump pipe 72 and communicates internally with the pump pipe 72. It is driven by the motor 71 to extract the medium.

[0025] To prevent impurities in the heat storage medium from entering the pump body 73 and causing blockage, an upwardly recessed groove is provided on the upper surface of the tank bottom 3 directly below the pump body 73. A filter cartridge 8 is vertically installed in the groove. The filter cartridge 8 is made of high-temperature resistant metal material, and its outer peripheral wall is fitted with the inner wall of the groove with a clearance fit, which can not only be stably fixed, but also facilitate installation and disassembly. The upper end of the filter cartridge 8 is sealed to the outer peripheral surface of the lower end of the pump pipe 72, ensuring that the medium can only enter the pump body 73 after being filtered through the filter cartridge 8.

[0026] The sealed connection between the filter cartridge 8 and the pump pipe 72 is achieved through a flange structure. A sealing plate 81 is horizontally mounted on the upper end of the filter cartridge 8. The edge of the sealing plate 81 is welded and fixed to the upper edge of the filter cartridge 8, and a through hole is opened in the middle for the pump pipe 72 to pass through. The inner diameter of the through hole matches the outer diameter of the pump pipe 72. Flanges 82 are welded to the upper surface of the sealing plate 81 and the lower outer circumference of the pump pipe 72, respectively. A high-temperature resistant sealing gasket 83 (such as a metal-clad gasket) is sandwiched between the two flanges 82, and bolts are used to tighten the connection through the flanges 82, ensuring no media leakage at the connection point.

[0027] The filter cartridge 8 is equipped with a cleaning component 9 to clear any salt buildup that may occur at the inlet of the pump body 73. The cleaning component 9 includes a driver 91, a turntable 92, and a cleaning rod 93. The driver 91 is fixed to the inner wall of the tank bottom 3 by a bracket, located on one side of the tank, with its driving end facing the pump body 73 and capable of rotating around its own axis. The center of the turntable 92 is fixed to the output shaft of the driver 91 and rotates synchronously with the driving end. One end of the cleaning rod 93 is vertically fixed to the edge of the turntable 92, not coaxial with the turntable 92, while the other end extends upward along the axis of the pump body 73 into the inlet of the pump body 73. When the driver 91 operates, the turntable 92 drives the cleaning rod 93 to rotate eccentrically, continuously agitating the water to prevent salt from accumulating and clogging at the inlet of the pump body 73.

[0028] The unblocking assembly 9 also includes a protective shell 95, which covers the outside of the driver 91 and the turntable 92. The lower end of the protective shell 95 is fixed to the inner wall of the tank bottom 3, while the upper end is open and has a gap with the inner wall of the filter cartridge 8 to avoid affecting the filtration effect of the filter cartridge 8. A through hole is formed at the center of the end wall of the protective shell 95 facing the pump body 73, and a bearing 96 is embedded in the hole. The outer ring of the bearing 96 is interference-fitted with the through hole. The end of the unblocking rod 93 away from the turntable 92 passes through the inner ring of the bearing 96 and is fixed thereto, ensuring smooth rotation of the unblocking rod 93. At least one end face of the bearing 96 has an annular sealing groove, and an annular sealing gasket 97 is press-fitted into the groove. The inner ring of the sealing gasket 97 tightly abuts against the outer circumferential surface of the unblocking rod 93 to prevent the heat storage medium from entering the interior of the protective shell 95.

[0029] The tank body 1 is also equipped with an annular distribution pipe 10 and an electric heating rod 11 for uniform feeding and auxiliary heating. The annular distribution pipe 10 is horizontally installed on the upper surface of the heat-resistant layer 5 at the bottom of the tank body 1, with its axis collinear with the axis of the tank body 1. It is fixed to the tank bottom 3 by a bottom bracket, and the pipe wall has uniformly opened discharge holes to ensure uniform distribution when the heat storage medium enters. The outer peripheral wall of the distribution pipe 10 is connected to the feed pipe 12. The lower end of the feed pipe 12 communicates with the inside of the distribution pipe 10, and the upper end extends upward along the inner side wall of the tank body 1, passing through the reserved channel of the dome 2. The passage is sealed by a high-temperature resistant sealing sleeve to prevent heat leakage.

[0030] Multiple electric heating rods 11 are provided and evenly distributed around the circumference of the tank body 1. One end of each electric heating rod 11 is fixed to the side wall of the tank body 1, and the other end extends radially towards the center of the tank body 1. The system is activated on cloudy days or when there is insufficient sunlight to maintain the temperature of the medium inside the tank and keep the system running stably.

[0031] This application provides a solar thermal storage tank with a reasonable structural design. It not only has good high temperature resistance and heat preservation performance, but also effectively prevents the pump body 73 from being blocked through the filter cartridge 8 and the unblocking component 9. At the same time, it achieves uniform feeding with the help of the annular distribution pipe 10, and the electric heating rod 11 ensures stable heat. It is suitable for the long-term operation of large-scale solar tube thermal storage systems.

[0032] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A solar thermal storage tank comprising a tank body, a dome and a tank bottom, the dome and tank bottom being provided at opposite ends of the tank body, characterised in that: A pump assembly is installed on the dome; the pump assembly includes a motor, a pump pipe and a pump body. The motor is fixed to the outer surface of the dome. The upper end of the pump pipe passes through the dome and is connected to the motor for transmission, and the lower end extends towards the bottom of the tank. The pump body is connected to the lower end of the pump pipe and is internally connected. There is a trough at the bottom of the tank corresponding to the pump body. A filter cartridge is installed in the trough. The upper end of the filter cartridge is sealed to the lower end of the pump pipe. There is a dredging assembly inside the filter cartridge. Its dredging end is movable and extends into the pump body.

2. The solar thermal storage tank according to claim 1, characterized in that: The tank body and tank bottom are integrally formed. The inner wall of the tank body and the upper surface of the tank bottom are successively covered with a refractory layer and a heat-resistant layer. The refractory layer is set in line with the inner wall surface of the tank body and tank bottom, and the heat-resistant layer is set in line with the inner side of the refractory layer and has the same coverage area as the refractory layer. The inner arc surface of the dome is provided with a heat-insulating layer, which completely covers the inner side of the dome and its edge is connected to the edge of the heat-resistant layer at the upper end of the tank body.

3. The solar powered thermal storage tank of claim 2, wherein: The refractory layer is heat-insulating refractory bricks laid on the inner wall of the tank body and bottom, the heat-resistant layer is acid-resistant and heat-resistant bricks laid on the inner side of the refractory layer, and the heat-insulating layer is refractory ceramic fiber blanket. The refractory ceramic fiber blanket is fixed to the inner arc surface of the arch by high-temperature resistant anchors.

4. The solar powered thermal storage tank of claim 1, wherein: The unblocking assembly includes a driver, a turntable, and an unblocking rod. The driver is fixedly installed on the inner wall of the tank bottom by a bracket. The driving end of the driver faces the pump body and can rotate around its own axis. The output shaft of the driving end is fixedly connected to the center position of the turntable. One end of the unblocking rod is vertically fixed to the edge of the turntable and is not coaxial with the turntable. The other end extends towards the pump body along the axial direction of the pump body.

5. The solar powered thermal storage tank of claim 4, wherein: The unblocking assembly also includes a protective shell covering the drive and the turntable. The protective shell has a perforation, and a bearing is embedded in the perforation. The end of the unblocking rod away from the turntable passes through the bearing. A sealing groove is reserved on at least one end face of the bearing. A sealing gasket is press-fitted into the sealing groove, and the inner side of the sealing gasket abuts against the unblocking rod.

6. The solar powered thermal storage tank of claim 1, wherein: A sealing plate is horizontally installed at the upper end of the filter cartridge. A through hole is opened in the middle of the sealing plate so that the pump pipe can pass through. Flanges are respectively installed on the sealing plate and the pump pipe, and a high-temperature resistant sealing gasket is sandwiched between the two flanges.

7. The solar powered thermal storage tank of claim 1, wherein: The tank is also equipped with an annular feeding pipe and electric heating rods. The annular feeding pipe is horizontally arranged on the upper surface of the heat-resistant layer at the bottom of the tank. A feed pipe is connected to the outer peripheral wall of the feeding pipe. The lower end of the feed pipe is connected to the inside of the feeding pipe, and the upper end extends upward along the inner side wall of the tank and passes through the reserved channel of the dome. The electric heating rods are evenly distributed along the circumference of the tank.

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