Cooling system of molten salt pump

Abstract

The utility model relates to the field of molten salt pump cooling, particularly discloses a cooling system of a molten salt pump, and solves the technical problems that the bearing cooling effect of the existing molten salt pump is unstable, heat is wasted, and parts are easy to scale and corrode. The device comprises the softened water tank, the high-temperature molten salt pump and the low-temperature molten salt pump, and inlets of the high-temperature molten salt pump and the low-temperature molten salt pump are connected with the softened water tank through the softened water feed pump, so that the treated softened water is used for cooling, and the scale depositing risk is reduced. In addition, the system is provided with a high-temperature section waste heat recovery unit and a low-temperature section waste heat recovery unit which are sequentially connected in series, the high-temperature section waste heat recovery unit is directly connected to an outlet of the high-temperature molten salt pump and an outlet of the low-temperature molten salt pump, and effective utilization of waste heat is achieved. According to the design, the cooling efficiency is improved, heat waste is reduced through energy recovery, meanwhile, the risk of equipment corrosion is reduced, the overall reliability of the system is improved, and the service life of the system is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of molten salt pump cooling technology, and more specifically, to a cooling system for a molten salt pump. Background Technology

[0002] Molten salt pumps are devices specifically designed for transporting high-temperature molten salts and are widely used in solar thermal power generation, nuclear power, and other industrial fields requiring efficient heat transfer media. Due to the special nature of their operating environment, molten salt pumps are required not only to operate stably at extreme temperatures but also to possess excellent corrosion resistance and sealing performance.

[0003] Molten salt is widely used as a heat storage and transfer medium in solar thermal power plants. By heating and storing the molten salt, its heat can be released to generate electricity when needed, thus achieving continuous power supply. In this process, molten salt pumps are responsible for delivering low-temperature molten salt into the heating system and transporting the heated high-temperature molten salt from the storage tank to the heat exchanger or steam generator.

[0004] To ensure the safe and stable operation of molten salt pumps, and especially to prevent damage due to excessive temperature rise, effective cooling of the pump bearings is crucial. Traditionally, molten salt pump bearings are cooled primarily using air cooling and water cooling. However, both methods have limitations: air cooling is limited by the low specific heat capacity of air and is greatly affected by ambient temperature, resulting in unstable heat dissipation and ineffective utilization of generated heat; while water cooling provides a more stable cooling effect, impurities and suspended solids in industrial water can easily form scale, affecting the sealing of the cooling system and the overall operating efficiency, thereby reducing the reliability and service life of the molten salt pump. Utility Model Content

[0005] The purpose of this invention is to provide a cooling system for a molten salt pump, which solves the technical problems of unstable bearing cooling, wasted heat, and easy scaling and corrosion of components in current molten salt pumps.

[0006] This utility model provides a cooling system for a molten salt pump, comprising: a softened water tank; a high-temperature molten salt pump and a low-temperature molten salt pump, the inlets of which are connected to the softened water tank via a softened water supply pump; a high-temperature section waste heat recovery unit and a low-temperature section waste heat recovery unit connected in series, the inlet of the high-temperature section waste heat recovery unit being connected to the outlet of the high-temperature molten salt pump and the outlet of the low-temperature molten salt pump.

[0007] According to one embodiment of the present invention, the high-temperature section waste heat recovery unit is a molten salt heater, and the molten salt heater is provided with a spiral coil preheating water pipe inside. The inlet of the preheating water pipe is connected to the outlet of the high-temperature molten salt pump and the outlet of the low-temperature molten salt pump, and the outlet of the preheating water pipe is connected to the low-temperature section waste heat recovery unit.

[0008] According to one embodiment of the present invention, the low-temperature waste heat recovery unit is a deaerator.

[0009] According to one embodiment of the present invention, it further includes: a temperature sensor and a flow sensor, respectively disposed at the inlet and outlet of the high-temperature molten salt pump and the low-temperature molten salt pump, as well as at the inlet and outlet of each high-temperature waste heat recovery unit and the low-temperature waste heat recovery unit.

[0010] According to one embodiment of the present invention, it further includes a controller, which is electrically connected to the temperature sensor and the flow sensor.

[0011] According to one embodiment of the present invention, the inner wall of the flow channel of the high-temperature molten salt pump and the low-temperature molten salt pump is provided with a nano-ceramic coating.

[0012] According to one embodiment of the present invention, the nano-ceramic coating is a hydrophobic nano-alumina coating.

[0013] According to one embodiment of the present invention, softened water is combined with the cooling high and low temperature molten salt pump and connected to the high temperature section waste heat recovery unit.

[0014] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0015] This invention uses softened water as the cooling medium and employs a series connection of high-temperature and low-temperature waste heat recovery units to ensure the stability and efficiency of the cooling system. It overcomes the limitations of traditional air-cooling and water-cooling methods. During the cooling process, the softened water not only provides cooling but also absorbs the heat released by the molten salt pump. This heat is further utilized in the high-temperature waste heat recovery unit (molten salt heater) and the low-temperature waste heat recovery unit (deaerator), achieving effective energy recovery and reuse, reducing energy waste. The inner walls of the flow channels of the high-temperature and low-temperature molten salt pumps are coated with a hydrophobic nano-alumina coating, which effectively prevents scale formation and reduces corrosion risk, thereby extending equipment lifespan and improving operating efficiency. The system is equipped with temperature and flow sensors connected to the controller, enabling real-time monitoring of the operating status of each part of the system, ensuring safe and stable operation, and facilitating timely detection and resolution of problems. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the cooling system of the molten salt pump provided in an embodiment of this utility model;

[0018] icon:

[0019] 100. Softened water tank; 110. Softened water supply pump;

[0020] 200. High-temperature molten salt pump;

[0021] 300. Cryogenic molten salt pump;

[0022] 400. Deaerator;

[0023] 500. Molten salt heater; 510. Spiral coil preheating water pipe. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Example 1

[0026] This utility model provides a cooling system for a molten salt pump to solve the technical problems of unstable bearing cooling, wasted heat, and easy scaling and corrosion of components in current molten salt pumps.

[0027] Please see Figure 1 The cooling system for the molten salt pump provided in this embodiment includes: a softened water tank 100 for storing softened water; a high-temperature molten salt pump 200 and a low-temperature molten salt pump 300, the inlets of which are connected to the softened water tank 100 via a softened water supply pump 110 to provide cooling water for the molten salt pump; and a high-temperature waste heat recovery unit and a low-temperature waste heat recovery unit connected in series, the inlet of which is connected to the outlet of the high-temperature molten salt pump 200 and the outlet of the low-temperature molten salt pump 300.

[0028] In this embodiment, the high-temperature section waste heat recovery unit is a molten salt heater 500. The molten salt heater 500 is equipped with a spiral coil preheating water pipe 510. The inlet of the preheating water pipe is connected to the outlet of the high-temperature molten salt pump 200 and the outlet of the low-temperature molten salt pump 300. The outlet of the preheating water pipe is connected to the low-temperature section waste heat recovery unit to recover waste heat and preheat the molten salt with the recovered waste heat.

[0029] In this embodiment, the low-temperature waste heat recovery unit is a deaerator 400. Using a deaerator 400 in the low-temperature waste heat recovery unit can not only further utilize waste heat to heat the feed water, but also ensure that the water quality meets the requirements and reduce corrosion problems caused by non-condensable gases such as oxygen in the subsequent system.

[0030] In this embodiment, a temperature sensor and a flow sensor are also included, which are respectively installed at the inlet and outlet of the high-temperature molten salt pump 200 and the low-temperature molten salt pump 300, as well as at the inlet and outlet of each high-temperature waste heat recovery unit and the low-temperature waste heat recovery unit, for monitoring the system operating status.

[0031] In this embodiment, the inner walls of the flow channels of the high-temperature molten salt pump 200 and the low-temperature molten salt pump 300 are provided with a nano-ceramic coating to reduce scaling and corrosion.

[0032] In this embodiment, the nano-ceramic coating is a hydrophobic nano-alumina coating to reduce scaling and corrosion.

[0033] In this embodiment, the softened water merges with the cooling high and low temperature molten salt pump 300 and is connected to the high temperature section waste heat recovery unit, reducing pipelines and costs.

[0034] The following is a detailed description of the usage process of the cooling system of the molten salt pump in Embodiment 1 of this utility model:

[0035] Softened water is pumped from the softened water tank 100 to the high-temperature molten salt pump 200 and the low-temperature molten salt pump 300 for cooling. After cooling, the softened water flows into the high-temperature waste heat recovery unit (molten salt heater 500). During this process, the molten salt absorbs heat and preheats the water. After being treated by the high-temperature waste heat recovery unit, the water flows to the low-temperature waste heat recovery unit (deaerator 400) for further waste heat recovery and deoxygenation. Throughout the process, temperature and flow sensors monitor the status of each key point of the system in real time to ensure stable system operation.

[0036] Example 2

[0037] This utility model provides a cooling system for a molten salt pump to solve the technical problems of unstable bearing cooling, wasted heat, and easy scaling and corrosion of components in current molten salt pumps.

[0038] The cooling system for the molten salt pump provided in Embodiment 2 of this utility model differs from that in Embodiment 1 only in that, in this embodiment, a controller is also included. The controller is electrically connected to the temperature sensor and the flow sensor. Through the connection with the temperature sensor and the flow sensor, the controller can acquire the operating parameters of the molten salt pump and its cooling system in real time, such as the inlet and outlet water temperatures, the molten salt temperature, and the water flow rate. The collected data is sent to the controller for analysis and processing. The controller evaluates whether the current system status is within the optimal or safe range based on the preset safety range or optimization parameters (such as the optimal operating temperature range, the maximum allowable flow rate, etc.). Based on the analysis results, if it is found that some parameters deviate from the set values ​​or there is a potential risk (such as excessive temperature may cause equipment damage), the controller controls the main switch to shut down the system for maintenance.

[0039] The embodiments of this utility model have at least the following advantages:

[0040] This invention uses softened water as the cooling medium and employs a series connection of high-temperature and low-temperature waste heat recovery units to ensure the stability and efficiency of the cooling system. It overcomes the limitations of traditional air-cooling and water-cooling methods. During the cooling process, the softened water not only provides cooling but also absorbs the heat released by the molten salt pump. This heat is further utilized in the high-temperature waste heat recovery unit (molten salt heater) and the low-temperature waste heat recovery unit (deaerator), achieving effective energy recovery and reuse, reducing energy waste. The inner walls of the flow channels of the high-temperature and low-temperature molten salt pumps are coated with a hydrophobic nano-alumina coating, which effectively prevents scale formation and reduces corrosion risk, thereby extending equipment lifespan and improving operating efficiency. The system is equipped with temperature and flow sensors connected to the controller, enabling real-time monitoring of the operating status of each part of the system, ensuring safe and stable operation, and facilitating timely detection and resolution of problems.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cooling system for a molten salt pump, characterized in that, The application relates to a high-temperature molten salt pump and a low-temperature molten salt pump, an inlet of each of which is connected to a softened water tank through a softened water feed pump; a high-temperature section waste heat recovery unit and a low-temperature section waste heat recovery unit connected in sequence, an inlet of the high-temperature section waste heat recovery unit being connected to outlets of the high-temperature molten salt pump and the low-temperature molten salt pump. The high-temperature section waste heat recovery unit is a molten salt heater, and a spiral coil type preheating water pipe is arranged in the molten salt heater; an inlet of the preheating water pipe is connected to the outlets of the high-temperature molten salt pump and the low-temperature molten salt pump; and an outlet of the preheating water pipe is connected to the low-temperature section waste heat recovery unit. The low-temperature section waste heat recovery unit is a deaerator. The application further comprises temperature sensors and flow sensors arranged at inlets and outlets of the high-temperature molten salt pump and the low-temperature molten salt pump and inlets and outlets of each high-temperature section waste heat recovery unit and low-temperature section waste heat recovery unit.

2. The molten salt pump cooling system of claim 1, wherein, The application further comprises a controller electrically connected to the temperature sensors and the flow sensors.

3. The molten salt pump cooling system of claim 1, wherein, The inner walls of flow channels of the high-temperature molten salt pump and the low-temperature molten salt pump are provided with nano ceramic coatings.

4. The molten salt pump cooling system of claim 1, wherein, The nano ceramic coatings are hydrophobic nano alumina coatings. The softened water is combined after cooling the high-temperature molten salt pump and the low-temperature molten salt pump and is connected to the high-temperature section waste heat recovery unit.

5. The molten salt pump cooling system of claim 4, wherein, ​ 6. The molten salt pump cooling system of claim 1, wherein, ​ 7. The molten salt pump cooling system of claim 6, wherein, ​ 8. The molten salt pump cooling system of claim 1, wherein, ​

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