Modularized fused salt energy storage sampling device

Abstract

The embodiment of the invention provides a modularized fused salt energy storage sampling device. The fused salt energy storage sampling device comprises a fused salt pump box, a flow guide pipe, a valve assembly and a sampling container, one end of the flow guide pipe is communicated with the molten salt pump box, and the other end of the flow guide pipe is communicated with the sampling container; the valve assembly is arranged on the flow guide pipe and used for controlling the flow of molten salt liquid. Wherein fused salt in the fused salt pump box is pumped to the flow guide pipe through a fused salt pump, and fused salt liquid is conveyed to the sampling container through the flow guide pipe. According to the molten salt sampling device, the molten salt liquid in the molten salt pump box is pumped into the flow guide pipe through the molten salt pump, the flow of the molten salt liquid is controlled through the valve assembly on the flow guide pipe, and the molten salt liquid finally flows into the sampling container, so that the sampling work of the molten salt is realized; tediousness of manual sampling and risks of climbing, falling, object hitting and even scalding are avoided.

Description

Technical Field

[0001] Embodiments of the present disclosure belong to the technical field of energy storage devices, and particularly relate to a modular molten salt energy storage sampling device. Background Art

[0002] Due to the continuous increase in the capacity of new energy such as wind power and photovoltaic power generation, and the strong randomness of wind power and photovoltaic power generation, the load changes greatly within a certain time range, which has a certain adverse impact on the reliability of power grid operation. To improve the consumption capacity of renewable energy, coal-fired power generation units that undertake more than half of the power generation of the power grid must be able to flexibly and quickly adjust the load, and a modular molten salt energy storage device for peak shaving / frequency modulation / steam supply of thermal power generation units is generated to achieve deep peak shaving of the units.

[0003] The modular molten salt energy storage device is a device with an open top to the air under normal pressure. Sodium nitrate salt, potassium nitrate, and sodium nitrite inside the modular molten salt energy storage device adsorb a certain amount of moisture in the air at low or normal temperatures, especially in the case of high air humidity at low temperatures, which exacerbates the corrosion of the inner wall of the salt storage device. In order to be able to detect the changes in the adsorbed moisture data of molten salt, the corrosion ability, and the compositional changes of the components in the molten salt per unit volume at different stages under different humidities and different temperatures in different seasons and different environments, and to provide molten salt samples for the laboratory, a sampling device is required.

[0004] To provide sample molten salt for the laboratory, currently, unmolten bulk salt is used, or after the heater stops heating and cools down, and the molten salt in the pump tank solidifies, the method of chiseling is used, which cannot meet the regular sampling of molten salt or the need to sample and test the compositional changes of molten salt and the data of the moisture adsorption ability of molten salt to provide samples. This sampling method is cumbersome and difficult to take, and there are risks such as falling from a height, being hit by an object, or even being scalded. Summary of the Invention

[0005] Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide a modular molten salt energy storage sampling device.

[0006] In one aspect of the embodiments of the present disclosure, a modular molten salt energy storage sampling device is provided. The molten salt energy storage sampling device includes a molten salt pump tank, a diversion pipe, a valve assembly, and a sampling container;

[0007] One end of the diversion pipe is connected to the molten salt pump tank, and the other end is connected to the sampling container; the valve assembly is arranged on the diversion pipe to control the flow rate of molten salt liquid;

[0008] Wherein, the molten salt in the molten salt pump tank is pumped to the diversion pipe by a molten salt pump, and the molten salt liquid is transported to the sampling container by using the diversion pipe.

[0009] Optionally, the valve assembly includes a manual valve and a solenoid valve; the manual valve is disposed upstream of the solenoid valve for manually controlling the flow rate of the molten salt liquid in the diversion pipe; the solenoid valve is controlled according to the manipulation of the control device to control the flow rate of the molten salt liquid in the diversion pipe.

[0010] Further, the molten salt energy storage sampling device further includes a support base; the support base is used to support the sampling container.

[0011] Further, the molten salt energy storage sampling device further includes a liquid level detection device; the liquid level detection device is disposed in the sampling container for detecting the liquid level of the molten salt in the sampling container.

[0012] Optionally, the liquid level detection device includes an external ultrasonic liquid level gauge, which is attached to the outer wall of the support wall of the sampling container.

[0013] Further, the molten salt energy storage sampling device further includes a temperature detection device; the temperature detection device is disposed in the diversion pipe for detecting the temperature of the molten salt flowing through the diversion pipe.

[0014] Optionally, the temperature detection device includes a thermocouple.

[0015] Further, the molten salt energy storage sampling device further includes a heating device; the heating device is disposed in the diversion pipe for heating the molten salt flowing through the diversion pipe.

[0016] Optionally, the heating device includes a self-regulating heating cable.

[0017] Further, the molten salt energy storage sampling device further includes a heat insulation layer; the heat insulation layer covers the molten salt pump tank, the diversion pipe and the sampling container.

[0018] The beneficial effects of the embodiments of the present disclosure include:

[0019] In the present disclosure, the molten salt in the molten salt pump tank is pumped into the diversion pipe by the molten salt pump, the flow rate of the molten salt liquid is controlled by the valve assembly on the diversion pipe, and finally flows into the sampling container, thereby realizing the sampling work of the molten salt, avoiding the cumbersome manual sampling and the risks of falling from heights, object strikes and even scalds. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a modular molten salt energy storage sampling device according to an embodiment of the present disclosure.

[0021] In the figure, 1 is a molten salt pump box; 2 is an opening in the pump box; 3 is a manual valve; 4 is an electromagnetic valve; 5 is a sampling container; 6 is a support base; 7 is a liquid level detection device; 8 is a temperature detection device; 9 is a heating device; 10 is a diversion pipe. Specific embodiments

[0022] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The following further describes in detail the embodiments of the present application in conjunction with the accompanying drawings. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that unless otherwise stated, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0024] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0025] As Figure 1 shown, a modular molten salt energy storage sampling device, the molten salt energy storage sampling device includes a molten salt pump box 1, a diversion pipe 10, a valve assembly, and a sampling container 5.

[0026] One end of the diversion pipe 10 is connected to the molten salt pump box 1, and the other end is connected to the sampling container 5. The valve assembly is arranged on the diversion pipe 10 to control the flow rate of the molten salt liquid.

[0027] Among them, the molten salt in the molten salt pump box 1 is pumped to the diversion pipe 10 by a molten salt pump, and the molten salt liquid is transported to the sampling container 5 by using the diversion pipe 10.

[0028] In the present disclosure, a molten salt pump is used to pump the molten salt liquid in the molten salt pump tank 1 into the diversion pipe 10. A valve assembly on the diversion pipe 10 is used to control the flow rate of the molten salt liquid, and finally it flows into the sampling container 5, thereby realizing the sampling work of the molten salt and avoiding the cumbersome manual sampling and the risk of working at heights.

[0029] In one embodiment, a molten salt pump is used to pump the molten salt liquid in the molten salt pump tank 1 into the diversion pipe 10 at a low frequency. It can be understood that the pumping frequency of the molten salt pump in the present disclosure is set as required, and its pumping frequencies include high frequency, medium frequency, and low frequency.

[0030] In some embodiments, the diversion pipe 10 has a pipe diameter of 14 mm.

[0031] In some embodiments, a pump tank opening 2 is provided on the molten salt pump tank 1, and the pump tank opening 2 is communicated with the diversion pipe 10. Among them, the molten salt pumped by the molten salt pump is pumped into the diversion pipe 10 through the pump tank opening 2.

[0032] In some embodiments, the valve assembly includes a manual valve 3 and a solenoid valve 4. The manual valve 3 is arranged upstream of the solenoid valve 4 and is used for manual control of the flow rate of the molten salt liquid in the diversion pipe 10. The solenoid valve 4 realizes the control of the flow rate of the molten salt liquid in the diversion pipe 10 according to the operation of the control device.

[0033] The manual valve 3 is a valve that controls the flow of fluids (such as liquids and gases) through manual operation. The manual valve 3 includes manual mechanisms such as a handwheel, a handle, a lever, or a sprocket for driving. In some embodiments, in order to reduce the force required by the operator, a gear or a worm gear reducer is provided between the handwheel and the valve stem. The manual valve 3 has the characteristics of simple structure, low cost, and easy maintenance.

[0034] Furthermore, the manual valve 3 in the present disclosure is selected as a high-temperature manual valve to be suitable for the control of high-temperature molten salt fluids. The present disclosure utilizes the functions of the high-temperature manual valve to change the passage cross-section and adjust the flow rate and pressure, thereby realizing the opening or closing of the valve by rotating the handwheel or pulling the handle, thus controlling the flow or blocking of the fluid, and finely adjusting the flow rate and pressure of the molten salt fluid.

[0035] The solenoid valve 4 is a basic automation component that uses electromagnetic force to control the flow of fluids (liquids or gases) and belongs to a type of actuator. It drives the valve core through the magnetic force generated by the electromagnetic coil, and then controls the opening or closing of the valve, realizing the adjustment of parameters such as the flow direction, flow rate, and speed of the medium.

[0036] In some embodiments, the solenoid valve 4 includes a direct-acting solenoid valve, a pilot-operated solenoid valve, and a proportional solenoid valve. When the direct-acting solenoid valve works, when the electromagnetic coil is energized, the generated electromagnetic force directly lifts the valve core and opens the valve. When the power is off, the electromagnetic force disappears, and the valve core resets under the action of the spring and closes the valve.

[0037] When a pilot-operated solenoid valve works, a small electromagnetic force is used to control a pilot valve, and the opening or closing of the pilot valve further controls the fluid passage of the main valve. Pilot-operated solenoid valves are usually used in large-diameter and high-pressure applications because they can more effectively control larger fluid pressures and flows.

[0038] When a proportional solenoid valve works, it can achieve continuous flow control. By adjusting the current intensity of the electromagnetic coil, the opening degree of the valve can be controlled, so as to achieve precise regulation of the flow rate.

[0039] In summary, setting the manual valve 3 and the solenoid valve 4 on the pipeline at the same time can improve the safety redundancy and operation flexibility of the sampling device. Safety redundancy includes emergency shutdown and maintenance isolation. Emergency shutdown includes: Since the manual valve 3 is set upstream of the solenoid valve 4, when a failure occurs in the sampling device or an emergency shutdown is required, the manual valve 3 can be used as the last safety measure to ensure the complete manual closure of the fluid and prevent accidental release. Maintenance isolation includes: When the solenoid valve 4 needs to be maintained or replaced, the manual valve 3 can be closed to isolate the system, enabling maintenance personnel to work under safe conditions.

[0040] Operation flexibility includes manual operation ability and backup control. Manual operation ability includes: In the case of power supply interruption or sampling device failure, the manual valve 3 allows the operator to manually control the flow of the fluid to ensure basic device operation or emergency response. Backup control includes: When the solenoid valve 4 fails or needs to be debugged, the manual valve 3 can be used as a backup control means to keep the device running.

[0041] Through the design of the manual valve 3 and the solenoid valve 4, the present disclosure can achieve staged operation and generate significant cost benefits. Staged operation includes: When it is necessary to gradually introduce or withdraw the fluid, the manual valve 3 can provide fine flow control, while the solenoid valve 4 is used for fast-response automated control. Cost benefits include: reducing the complexity of the sampling device design and extending the service life. Reducing complexity includes: Although the manual valve 3 is added, in some cases, this can simplify the design of the control system and reduce the demand for expensive automatic control components. Extending the service life includes: In pipelines where frequent operation is not required, the manual valve 3 can reduce the wear of the solenoid valve 4 and extend its service life.

[0042] Generally speaking, the combined use of the manual valve 3 and the solenoid valve 4 provides redundancy and flexibility in the control of the sampling device, enhancing the overall safety and reliability of the device.

[0043] In some embodiments, the molten salt energy storage sampling device further includes a support base 6, and the support base 6 is used to support the sampling container 5.

[0044] In the present disclosure, by providing a support base 6 for supporting the sampling container 5, the sampling container 5 can be adapted to different terrains and environmental conditions to complete the collection of molten salt samples, and it is convenient to place and take the sampling container 5.

[0045] In some embodiments, the molten salt energy storage sampling device further includes a liquid level detection device 7. The liquid level detection device 7 is disposed in the sampling container 5 for detecting the liquid level of the molten salt in the sampling container 5.

[0046] In some embodiments, the sampling container 5 is a cylindrical container with a diameter of 10 cm and a height of 15 cm for storing the diverted molten salt liquid.

[0047] In some embodiments, the liquid level detection device 7 includes an external ultrasonic liquid level gauge attached to the outer wall of the sampling container 5.

[0048] The external ultrasonic liquid level gauge, also known as a non-intrusive ultrasonic liquid level gauge, is a measuring instrument that can measure the liquid level without directly contacting the liquid. This liquid level gauge emits ultrasonic pulses towards the container wall and then receives the echo reflected from the liquid surface inside the container, and calculates the liquid level height based on the time difference of the sound wave round trip.

[0049] The advantages of using the external ultrasonic liquid level gauge in the present disclosure include:

[0050] Non-intrusive measurement: There is no need to drill holes in the sampling container 5 or install immersion sensors, reducing the installation cost and maintenance work, and at the same time avoiding potential leakage risks. Wide application range: It can be used to measure a variety of liquids, including corrosive, toxic, flammable or explosive media, and is suitable for use in dangerous or difficult-to-access environments. Easy installation: Usually only need to be attached to the outside of the sampling container 5 and can be put into use through simple calibration, reducing the installation time and cost. Simple maintenance: There are no components directly contacting the molten salt medium, reducing maintenance problems caused by the characteristics of the molten salt medium (such as viscosity, corrosiveness). Real-time detection: It can continuously detect the change of the molten salt liquid level and is suitable for process control and alarm systems.

[0051] In some embodiments, the molten salt energy storage sampling device further includes a temperature detection device 8. The temperature detection device 8 is disposed in the diversion pipe 10 for detecting the temperature of the molten salt flowing through the diversion pipe 10.

[0052] In some embodiments, the temperature detection device 8 includes a thermocouple.

[0053] The beneficial effects of using the thermocouple in the present disclosure include:

[0054] Wide measurement range: The thermocouple can measure a wide range of temperatures from low to high, enabling high-range temperature detection of molten salt liquids. Fast response speed: The thermocouple can quickly respond to temperature changes in molten salt liquids. Simple structure: Easy to manufacture and use. Cost-effectiveness: Compared with other temperature sensors, thermocouples usually have lower costs.

[0055] In some embodiments, the molten salt energy storage sampling device further includes a heating device 9. The heating device 9 is disposed on the diversion pipe 10 and is used to heat the molten salt flowing through the diversion pipe 10.

[0056] In some embodiments, the heating device 9 includes a self-regulating heating cable.

[0057] The self-regulating heating cable includes one or more heating elements (such as resistance wires) wrapped in insulating materials and then wrapped in a metal sheath (armoring layer) to increase its mechanical strength, durability, and safety.

[0058] The self-regulating heating cable includes a heating element, an insulating layer, an armoring layer, and an outer sheath. The heating element is used to generate heat. The insulating layer is used to protect the heating element from the external environment and prevent current leakage. The armoring layer is used to provide additional mechanical protection against abrasion and external damage. The outer sheath is the outermost protective layer that provides corrosion and waterproofing functions.

[0059] The self-regulating heating cable adopted in the present disclosure has the characteristics of high mechanical strength, high pressure resistance, fast thermal response, and flexible installation. The armoring layer provides additional physical protection, making it more durable. Due to the thinness of the armoring layer, heat energy is transferred quickly, and the heating speed is fast. The self-regulating heating cable can be cut and bent as needed to adapt to different installation requirements.

[0060] In some embodiments, the molten salt pumps in the molten salt pump tank 1 of the solenoid valve 4 are all electrically connected to the control device. The control device is used to control the start and stop of the molten salt pumps and the opening degree of the solenoid valve 4. In some embodiments, the control device includes a PLC (Programmable Logic Controller). Further, the liquid level detection device 7, the temperature detection device 8, and the heating device 9 are all electrically connected to the control device.

[0061] In some embodiments, the molten salt energy storage sampling device further includes a thermal insulation layer that covers the molten salt pump tank 1, the diversion pipe 10, and the sampling container 5. The thermal insulation layer includes thermal insulation rock wool.

[0062] The thermal insulation layer is used to cover all the externally exposed devices of the sampling device. All the externally exposed devices are wrapped with thermal insulation cotton to play a role in heat preservation and anti-scalding. Since the temperature of the molten salt can reach 160° after it becomes molten and is prone to solidification and scalding when it encounters cold, at least one layer of thermal insulation rock wool is added.

[0063] A specific example provided by the present disclosure includes: The preconditions for sampling using a sampling device include: The manual door is in the open state. The solenoid valve 4 is not energized, and its solenoid valve 4 door is in the closed state. The armored heating tape is not heated and is in the non-energized state. The sampling container 5 is in the vacant state. The liquid level detection device 7 detects the change of the molten salt liquid level in real time.

[0064] During the molten salt heat storage process, in the stage of commissioning heat storage, the molten salt pump tank 1 is in the electric heating state, and when the temperature of the molten salt in the molten salt pump tank 1 has reached above 160° (preset sampling temperature), the molten salt pump is in the operating state. Among them, when the molten salt solids are in the molten state, the molten salt can flow, and the molten salt is in a circulating state.

[0065] A specific example of automatic sampling provided by the present disclosure includes:

[0066] When the temperature in the molten salt pump tank 1 reaches 160° (preset sampling temperature) and above, the PLC controls the molten salt pump in the molten salt pump tank 1 to start circulating, and the electric heater is put into operation. And the PLC respectively controls the external ultrasonic level gauge to start detecting the liquid level of the sampling container 5, and the thermocouple on the diversion pipe 10 to detect the temperature.

[0067] In one case, if the PLC determines that the temperature detected by the thermocouple reaches 160° and above, and the liquid level scanned by the external ultrasonic level gauge in the sampling container 5 does not reach the specified liquid level of 10 cm (preset liquid level of the sampling container 5), the PLC controls the solenoid valve 4 to open (the manual valve 3 is manually opened), so that the molten salt liquid flows into the sampling container 5 through the diversion pipe 10. Among them, the manual valve 3 is used to manually adjust the flow rate of the molten salt liquid, and the solenoid valve 4 adjusts the flow rate of the molten salt liquid flowing through according to the control of the control device.

[0068] Furthermore, the PLC continuously scans the change of the liquid level detected by the external ultrasonic level gauge. When it scans that the liquid level is 10 cm (reaching the preset liquid level), the PLC controls the solenoid valve 4 to close and stops sampling.

[0069] In another case, when the temperature detected by the PLC scanning the thermocouple does not reach 160° (preset sampling temperature) or above, the PLC controls the armored heating tape to start heating. The PLC continuously scans the temperature detected by the thermocouple. When the temperature reaches 160° or above, the PLC controls the armored heating tape to stop heating. Further, the PLC continuously scans the liquid level change of the sampling container 5 measured by the external ultrasonic liquid level gauge. When it scans that the liquid level of the sampling container 5 is less than 10 cm, the PLC controls the solenoid valve 4 to open (the manual valve 3 is manually opened), and the molten salt liquid enters the sampling container 5 through the diversion pipe 10. Further, when the PLC scans that the liquid level of the sampling container 5 measured by the external ultrasonic liquid level gauge reaches 10 cm, the PLC issues an instruction to close the solenoid valve 4 to control the solenoid valve 4 to close the valve, and the sampling ends.

[0070] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present disclosure. However, the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the present disclosure.

Claims

1. A modular molten salt energy storage sampling device, characterized in that: The molten salt energy storage sampling device comprises a molten salt pump box, a flow guide pipe, a valve assembly and a sampling container; One end of the flow guide pipe is connected to the molten salt pump box, and the other end is connected to the sampling container; the valve assembly is arranged on the flow guide pipe to control the flow rate of the molten salt liquid; The molten salt in the molten salt pump box is pumped to the guide tube by a molten salt pump, and the guide tube is used to transport the molten salt liquid to the sampling container.

2. A modular molten salt energy storage sampling device according to claim 1, characterized in that: The valve assembly includes a manual valve and a solenoid valve; the manual valve is arranged upstream of the solenoid valve and is used for manually controlling the flow rate of the molten salt liquid in the guide pipe; the solenoid valve realizes the flow rate control of the molten salt liquid in the guide pipe according to the operation control of the control device.

3. A modular molten salt energy storage sampling device according to claim 1 or 2, characterized in that: The molten salt energy storage sampling device also includes a support base; the support base is used to support the sampling container.

4. A modular molten salt energy storage sampling device according to claim 1 or 2, characterized in that: The molten salt energy storage sampling device also includes a liquid level detection device; the liquid level detection device is arranged in the sampling container and is used to detect the liquid level of the molten salt in the sampling container.

5. A modular molten salt energy storage sampling device according to claim 4, characterized in that: The liquid level detection device comprises an external ultrasonic liquid level meter which is attached to the outer wall of the supporting wall of the sampling container.

6. A modular molten salt energy storage sampling device according to claim 1 or 2, characterized in that: The molten salt energy storage sampling device also includes a temperature detection device; the temperature detection device is arranged in the flow guide pipe and is used to detect the temperature of the molten salt flowing through the flow guide pipe.

7. A modular molten salt energy storage sampling device according to claim 6, characterized in that: The temperature detection device includes a thermocouple.

8. A modular molten salt energy storage sampling device according to claim 1 or 2, characterized in that: The molten salt energy storage sampling device also includes a heating device; the heating device is arranged in the flow guide pipe and is used to heat the molten salt flowing through the flow guide pipe.

9. A modular molten salt energy storage sampling device according to claim 8, characterized in that: The heating device includes an armored heating tape.

10. A modular molten salt energy storage sampling device according to claim 1 or 2, characterized in that: The molten salt energy storage sampling device also includes a thermal insulation layer; the thermal insulation layer is coated on the molten salt pump box, the flow guide pipe and the sampling container.

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