Molten salt spherical tank heat storage and heat exchange gas pressure conveying device

Abstract

The utility model relates to the technical field of high-temperature heat storage and exchange systems, and discloses a molten salt spherical tank heat storage and exchange gas pressure conveying device which comprises a low-temperature molten salt spherical tank and a high-temperature molten salt spherical tank, and gas supply pipeline systems and electric heating boilers are arranged at the tops of the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank. The electric boiler is arranged on the right side of the low-temperature molten salt ball valve and used for improving the heat storage efficiency at the off-peak electricity price. Continuous or intermittent fused salt conveying is achieved through gas pressure balance and a pressure regulating valve set, low-temperature fused salt liquid obtained after fused salt in the high-temperature fused salt spherical tank is subjected to heat exchange through a gas pressure conveying fused salt heat exchanger is conveyed to the low-temperature fused salt spherical tank to be stored, and the fused salt liquid in the low-temperature fused salt spherical tank is conveyed to the fused salt heater through gas pressure to be heated and then conveyed to the high-temperature fused salt spherical tank. The effects of avoiding the risk of sealing leakage caused by the high temperature of the molten salt pump, being simple in structure, stable in operation, suitable for large and medium-sized molten salt heat storage and exchange systems, capable of accurately controlling the flow, stable in top pressure and rapid in response are achieved.

Description

A molten salt spherical tank heat storage and heat exchange gas pressure conveying device Technical Field

[0001] This utility model relates to the technical field of high-temperature thermal storage and heat exchange systems, specifically a gas pressure conveying device for thermal storage and heat exchange in a molten salt spherical tank. Background Technology

[0002] Currently, in molten salt thermal storage systems, the transportation of molten salt generally relies on high-temperature circulating pumps. However, molten salt pumps have problems such as complex structure, difficulty in high-temperature sealing, high maintenance costs, and high energy consumption. Especially under high-temperature long-term operation or intermittent conditions, the pump body and shaft seal are prone to leakage or failure, affecting the stability and safety of the system. Therefore, there is an urgent need for a high-temperature molten salt transportation method that does not require the use of molten salt pumps, has a simpler structure, and is easier to maintain. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a molten salt spherical tank heat storage and heat exchange gas pressure conveying device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a molten salt spherical tank heat storage and heat exchange gas pressure conveying device, comprising:

[0005] Both the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank are used to store salt solution, and the top of the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank are equipped with a gas supply pipeline system;

[0006] The gas supply pipeline system includes a gas supply pipeline, a pressure reducing valve, a pressure regulator, and a safety relief valve;

[0007] The top of both the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank is equipped with a gas supply pipeline, a pressure reducing valve, a pressure regulator, and a safety pressure relief valve.

[0008] An electric boiler is installed to the right of a low-temperature molten salt ball valve to improve heat storage efficiency during off-peak electricity prices.

[0009] Both the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank are equipped with valves and radar level gauges at the top to maintain a constant top pressure temperature inside the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank, which can be dynamically adjusted according to the flow rate requirement;

[0010] A molten salt conveying pipeline system is used to convey molten salt, and the molten salt conveying pipeline system is installed between a low-temperature molten salt spherical tank and a high-temperature molten salt spherical tank;

[0011] Molten salt heat exchangers and molten salt heaters are used to heat the salt solution. The molten salt heat exchangers and molten salt heaters are installed inside the molten salt conveying pipeline system and located between the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank.

[0012] Preferably, both the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank are equipped with an internal heater, a molten salt heat exchange steam generator, an insulation layer, a pressure gauge, a thermometer, a level gauge, valves, and a PLC intelligent control system.

[0013] Preferred options also include:

[0014] A gas spherical tank for storing gas is located to the left of the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank.

[0015] Gas compressor one and gas compressor two are used to compress air, and both gas compressor one and gas compressor two are installed in the gas supply pipeline system.

[0016] Preferably, both the pressure regulator and the pressure reducing valve are installed in the gas supply pipeline system.

[0017] Preferably, the inner side of the low-temperature molten salt spherical tank and the high-temperature molten salt spherical tank is provided with molten salt, which is a binary salt or a ternary salt, and the working temperature range is 150 to 580°C. The specific working temperature is determined according to the molten salt composition required by the process.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. Avoid the risk of seal leakage caused by high temperature of molten salt pump.

[0020] 2. It has a simple structure, stable operation, and is suitable for large and medium-sized molten salt thermal storage and heat exchange systems.

[0021] 3. It can precisely control the flow rate, maintain stable top pressure, and respond quickly.

[0022] 4. The system has no rotating parts, resulting in low operating and maintenance costs and reducing the number of downtime maintenance visits.

[0023] 5. Applicable to molten salt energy storage, solar power generation, wind power generation, thermal power generation, large-scale industrial waste heat energy storage, and energy storage heat exchange process.

[0024] 6. The company's patented "Large Three-Layer Skirt Support Column Grid Support for Molten Salt Spherical Tank" is adopted to improve the tank's seismic resistance and leak prevention performance, ensuring the long-term safe operation of the molten salt spherical tank. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the structural system of this utility model.

[0026] In the diagram: 1. Low-temperature molten salt spherical tank; 2. High-temperature molten salt spherical tank; 3. Molten salt heater; 4. Molten salt heat exchanger; 5. Gas spherical tank; 6. Gas supply pipeline system; 7. Molten salt conveying pipeline system; 8. PLC intelligent control system; 9. Gas compressor one; 10. Gas compressor two; 11. Pressure regulator; 12. Pressure reducing valve; 13. Safety relief valve; 14. Valve; 15. Radar level gauge; 16. Thermometer; 17. Pressure gauge; 18. Insulation layer; 19. Internal heater; 20. Electric boiler. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example:

[0029] Please refer to Figure 1.

[0030] A molten salt spherical tank heat storage and heat exchange gas pressure conveying device includes:

[0031] Low-temperature molten salt spherical tank 1 and high-temperature molten salt spherical tank 2 are both used to store salt liquid. Gas supply pipeline system 6 is installed on the top of low-temperature molten salt spherical tank 1 and high-temperature molten salt spherical tank 2.

[0032] The gas supply pipeline system 6 includes a gas supply pipeline, a pressure reducing valve 12, a pressure regulator 11, and a safety relief valve 13;

[0033] Both the low-temperature molten salt spherical tank 1 and the high-temperature molten salt spherical tank 2 are equipped with gas supply pipelines, pressure reducing valves 12, pressure regulators 11 and safety pressure relief valves 13 on their tops;

[0034] Electric boiler 20 is located on the right side of the low-temperature molten salt ball valve to improve heat storage efficiency during off-peak electricity prices.

[0035] Both the low-temperature molten salt spherical tank 1 and the high-temperature molten salt spherical tank 2 are equipped with valves 14 and radar level gauges 15 at the top to maintain a constant top pressure temperature inside the low-temperature molten salt spherical tank 1 and the high-temperature molten salt spherical tank 2, which can be dynamically adjusted according to flow requirements.

[0036] Molten salt conveying pipeline system 7 is used to convey molten salt. Molten salt conveying pipeline system 7 is installed between low temperature molten salt spherical tank 1 and high temperature molten salt spherical tank 2.

[0037] Molten salt heat exchanger 4 and molten salt heater 3 are used to heat the salt solution. Molten salt heat exchanger 4 and molten salt heater 3 are installed inside the molten salt conveying pipeline system 7 and located between the low temperature molten salt spherical tank 1 and the high temperature molten salt spherical tank 2.

[0038] Both the low-temperature molten salt spherical tank 1 and the high-temperature molten salt spherical tank 2 are equipped with an internal heater 19, a molten salt heat exchange steam generator, an insulation layer 18, a pressure gauge 17, a thermometer 16, a level gauge, a valve 14, and a PLC intelligent control system 8.

[0039] Also includes:

[0040] Gas spherical tank 5 is used to store gas. Gas spherical tank 5 is located on the left side of low temperature molten salt spherical tank 1 and high temperature molten salt spherical tank 2.

[0041] Gas compressor 9 and gas compressor 10 are used to compress air. Both gas compressor 9 and gas compressor 10 are installed in the gas supply pipeline system 6.

[0042] Both the pressure regulator 11 and the pressure reducing valve 12 are installed in the gas supply pipeline system 6;

[0043] The inner sides of the low-temperature molten salt spherical tank 1 and the high-temperature molten salt spherical tank 2 are provided with molten salt. The molten salt is a binary salt or a ternary salt, and the working temperature range is 150 to 580℃. The working temperature is determined according to the molten salt composition required by the process.

[0044] Specifically,

[0045] Both the high-temperature molten salt spherical tank 2 and the low-temperature molten salt spherical tank 1 adopt the structure of the "Large Three-Layer Skirt Support Column Grid Support Molten Salt Spherical Tank" independently developed by our company, with the specific patent number: CN221606702U. The molten salt spherical tank is equipped with superheated steam and electric heaters, molten salt heater 3, molten salt heat exchange steam generator, insulation layer 18, pressure gauge 17, thermometer 16, level gauge, valve 14 and PLC intelligent control system 8;

[0046] Both the high-temperature molten salt spherical tank 2 and the low-temperature molten salt spherical tank 1 are equipped with gas supply pipelines at the top, and are equipped with pressure regulating valves, pressure stabilizers 11 and safety pressure relief valves 13. An electric heating boiler 20 is installed near the low-temperature molten salt spherical tank 1 to improve heat storage efficiency during off-peak electricity prices.

[0047] The heat exchanger inlet is connected to the outlet of the high-temperature molten salt spherical tank 2;

[0048] The heat exchanger outlet is connected to the inlet of the low-temperature molten salt spherical tank 1, forming a molten salt flow path;

[0049] The gas pressure creates a stable pressure difference, which pushes the 580°C molten salt through the heat exchanger and then into the 150°C low-temperature molten salt tank.

[0050] During system operation, the high-temperature molten salt spherical tank 2 maintains a constant top pressure, and the PLC intelligent control system 8 is used to regulate the gas pressure and control the molten salt flow rate.

[0051] The entire system has no molten salt pump structure; it achieves continuous or intermittent molten salt delivery through gas pressure balancing and pressure regulating valve groups.

[0052] The molten salt in the high-temperature molten salt spherical tank 2 is transported by gas pressure to the molten salt heat exchanger 4, and the low-temperature molten salt liquid after heat exchange is sent to the low-temperature molten salt spherical tank 1 for storage; the molten salt liquid in the low-temperature molten salt spherical tank 1 is sent by gas pressure to the molten salt heater 3 for heating and then sent to the high-temperature molten salt spherical tank 2, and the cycle repeats.

[0053] In the embodiment: the molten salt heater 3, the PLC intelligent control system 8, the gas compressor 1 9, the gas compressor 2 10 and the electric boiler 20 are existing structures, and the control circuit can be implemented by simple programming by those skilled in the art. They are common knowledge in the art, and are only used without modification. Therefore, the control method and circuit connection will not be described in detail.

[0054] Working principle: The heat exchanger inlet is connected to the outlet of the high-temperature molten salt spherical tank 2, and the heat exchanger outlet is connected to the inlet of the low-temperature molten salt spherical tank 1, forming a molten salt flow path. After the gas pressure is applied, a stable pressure difference is formed, which pushes the 580℃ molten salt through the heat exchanger and into the 150℃ low-temperature molten salt tank. During system operation, the high-temperature molten salt spherical tank 2 is kept at a constant pressure. The PLC intelligent control system 8 is used to regulate the gas pressure and control the molten salt flow. The entire system has no molten salt pump structure. Continuous or intermittent molten salt transportation is achieved through gas pressure balance and pressure regulating valve group. The molten salt in the high-temperature molten salt spherical tank 2 is transported to the low-temperature molten salt spherical tank 1 for storage after being heat-exchanged by the molten salt heat exchanger 4 through gas pressure. The molten salt liquid in the low-temperature molten salt spherical tank 1 is sent to the molten salt heater 3 for heating through gas pressure and then sent to the high-temperature molten salt spherical tank 2. The cycle repeats, achieving the effect of eliminating the risk of sealing leakage caused by the high temperature of the molten salt pump. The structure is simple, the operation is stable, and it is suitable for large and medium-sized molten salt heat storage and heat exchange systems. It can accurately control the flow rate, stabilize the pressure, and respond quickly.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure conveying device for heat exchange gas in a molten salt spherical tank, characterized in that, include: Low-temperature molten salt spherical tank (1) and high-temperature molten salt spherical tank (2) are both used to store salt solution. The top of the low-temperature molten salt spherical tank (1) and the high-temperature molten salt spherical tank (2) is provided with a gas supply pipeline system (6). The gas supply pipeline system (6) includes a gas supply pipeline, a pressure reducing valve (12), a pressure regulator (11) and a safety relief valve (13). The top of the low-temperature molten salt spherical tank (1) and the high-temperature molten salt spherical tank (2) is provided with a gas supply pipeline, a pressure reducing valve (12), a pressure regulator (11) and a safety relief valve (13). An electric heating boiler (20) is set on the right side of the low-temperature molten salt spherical valve to improve the heat storage efficiency during off-peak electricity prices. The low-temperature molten salt spherical tank... Both the tank (1) and the high-temperature molten salt spherical tank (2) are equipped with valves (14) and radar level gauges (15) to maintain a constant top pressure temperature in the low-temperature molten salt spherical tank (1) and the high-temperature molten salt spherical tank (2), which can be dynamically adjusted according to flow requirements; a molten salt conveying pipeline system (7) is used to convey salt liquid, and the molten salt conveying pipeline system (7) is located between the low-temperature molten salt spherical tank (1) and the high-temperature molten salt spherical tank (2); a molten salt heat exchanger (4) and a molten salt heater (3) are used to heat the salt liquid, and the molten salt heat exchanger (4) and the molten salt heater (3) are located inside the molten salt conveying pipeline system (7) and between the low-temperature molten salt spherical tank (1) and the high-temperature molten salt spherical tank (2).

2. The molten salt spherical tank heat storage and heat exchange gas pressure conveying device according to claim 1, characterized in that: Both the low-temperature molten salt spherical tank (1) and the high-temperature molten salt spherical tank (2) are equipped with an internal heater (19), a molten salt heat exchange steam generator, an insulation layer (18), a pressure gauge (17), a thermometer (16), a level gauge, a valve (14), and a PLC intelligent control system (8).

3. The molten salt spherical tank heat storage and heat exchange gas pressure conveying device according to claim 1, characterized in that, Also includes: Gas spherical tank (5) is used to store gas. The gas spherical tank (5) is located on the left side of the low temperature molten salt spherical tank (1) and the high temperature molten salt spherical tank (2). Gas compressor one (9) and gas compressor two (10) are used to compress air. Both gas compressor one (9) and gas compressor two (10) are located in the gas supply pipeline system (6).

4. The molten salt spherical tank heat storage and heat exchange gas pressure conveying device according to claim 1, characterized in that: The voltage regulator (11) and the pressure reducing valve (12) are both installed in the gas supply pipeline system (6).

5. The molten salt spherical tank heat storage and heat exchange gas pressure conveying device according to claim 1, characterized in that: Molten salt is provided inside the low-temperature molten salt spherical tank (1) and the high-temperature molten salt spherical tank (2). The molten salt is a binary salt or a ternary salt, and the working temperature range is 150 to 580°C. The working temperature is determined according to the molten salt composition required by the process.

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