A molten salt corrosion inhibitor feeding device and a feeding method

Abstract

The application discloses a molten salt corrosion inhibitor feeding device, which comprises a stock bin for storing the corrosion inhibitor, a mixing bin provided with a working medium inlet and a working medium outlet and communicated with the working medium, a first feeding channel arranged between the stock bin and the mixing bin and used for connecting the two, the corrosion inhibitor entering the mixing bin to mix with the working medium through the first feeding channel, a first closing assembly used for opening or closing the first feeding channel, a rotating assembly arranged in the mixing bin and driven to rotate by the working medium flow, and a transmission assembly connected with the rotating assembly and the first closing assembly, wherein the rotating assembly is driven by the transmission assembly to rotate the first closing assembly, and the first closing assembly periodically opens or closes the first feeding channel when rotating. The device can add the corrosion inhibitor in real time under the working state of the working medium, thereby guaranteeing the safety of long-term operation of the system.

Description

Technical Field

[0001] This invention belongs to the field of molten salt thermal storage technology, and particularly relates to a molten salt corrosion inhibitor dispensing device and dispensing method. Background Technology

[0002] With the development of solar thermal power generation technology, the requirements for heat storage temperature are getting higher and higher in order to achieve higher thermoelectric conversion efficiency. High-temperature molten salts (chloride salts, carbonate salts, etc.) will become ideal heat storage and heat exchange working fluids in the third generation of solar thermal power generation technology. However, compared with existing solar salts (nitrates), high-temperature molten salts have a stronger corrosive effect on alloy structures such as heat storage tanks and pipelines at high temperatures.

[0003] Corrosive impurities (oxygen, water, etc.) in high-temperature molten salt are generally removed through electrolytic purification, pre-melting, and pre-mixing corrosion inhibitors to reduce its corrosivity before it can be put into operation in the thermal storage system.

[0004] However, during long-term heat storage and heat exchange operations, corrosive impurities inevitably mix into the high-temperature molten salt, leading to increased corrosivity and seriously jeopardizing the long-term reliability of the heat storage and heat exchange system. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a molten salt corrosion inhibitor dispensing device and dispensing method. This device can add corrosion inhibitors in real time while the working medium is in operation, ensuring the safety of the system during long-term operation.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A molten salt corrosion inhibitor dispensing device, comprising:

[0008] The silo contains corrosion inhibitors;

[0009] The mixing chamber is equipped with a working fluid inlet and a working fluid outlet and is circulated with working fluid.

[0010] A first feeding channel is provided between the silo and the mixing silo and is used to connect the two. The corrosion inhibitor enters the mixing silo through the first feeding channel and mixes with the working fluid.

[0011] The first sealing component is used to open or close the first feeding channel;

[0012] A rotating assembly is located in the mixing chamber, and the working fluid flow drives the rotating assembly to rotate.

[0013] A transmission assembly connects the rotating assembly and the first enclosed assembly;

[0014] The rotating component drives the first enclosed component to rotate via the transmission component, and the first feeding channel is periodically opened or closed when the first enclosed component rotates.

[0015] According to an embodiment of the present invention, it includes:

[0016] An isolation chamber is located between the silo and the mixing chamber, and the first feeding channel is located between the silo and the isolation chamber and is used to connect the two.

[0017] The second feeding channel is located between the isolation chamber and the mixing chamber and is used to connect the two.

[0018] The second sealing component is used to open or close the second feeding channel, and when the second feeding channel is open, the first feeding channel is closed.

[0019] According to one embodiment of the present invention, a pressurization assembly is included for filling the isolation chamber with gas.

[0020] According to an embodiment of the present invention, it includes:

[0021] An inflation channel is provided inside the transmission assembly. The transmission assembly passes through the isolation chamber and has an air outlet that connects the inflation channel and the isolation chamber. One end of the inflation channel is connected to the isolation chamber, and the other end is connected to the air outlet of the pressurization assembly.

[0022] According to one embodiment of the present invention, a third sealing component is included, which is fixedly disposed within the isolation chamber. A transmission component is inserted through and rotatably connected to the third sealing component. The third sealing component is provided with a connecting hole for communicating the air outlet and the isolation chamber. When the transmission component rotates, the air outlet and the connecting hole periodically overlap or misalign, so that the inflation channel periodically communicates with the isolation chamber.

[0023] According to one embodiment of the present invention, the pressurizing component is a rotary gas compressor, and the transmission component is connected to the rotor of the rotary gas compressor.

[0024] According to one embodiment of the present invention, the second sealing component is connected to the transmission component, the transmission component drives the second sealing component to rotate, and the second feeding channel is periodically opened or closed when the second sealing component rotates.

[0025] According to an embodiment of the present invention:

[0026] The first sealing component is a first rotating component, which is located at one end of the hopper and is sleeved and fixed to the transmission component and driven by it to rotate. The first rotating component is provided with a first material leakage groove.

[0027] A first fixing member is provided on one side of the first rotating member. The first fixing member is fixedly connected to one end of the hopper. The first fixing member is provided with a second material leakage groove. The first material leakage groove and the second material leakage groove cooperate to form the first feeding channel.

[0028] When the first rotating component rotates, the first material discharge trough and the second material discharge trough periodically overlap or misalign to open or close the first feeding channel.

[0029] According to an embodiment of the present invention:

[0030] The second sealing component is a second rotating component, which is located at one end of the isolation chamber near the mixing chamber and is sleeved and fixed to the transmission component. The second rotating component is provided with a third material leakage groove, and the transmission component drives the second rotating component to rotate.

[0031] A second fixing member is provided on one side of the second rotating member. The second fixing member is fixedly connected to one end of the isolation chamber near the mixing chamber. The second fixing member is provided with a fourth material leakage trough. The third material leakage trough and the fourth material leakage trough cooperate to form the second feeding channel. The second rotating member rotates relative to the second fixing member.

[0032] When the second rotating component rotates, the third and fourth material discharge channels periodically overlap or misalign to open or close the second feeding channel, and when the first and second material discharge channels overlap, the third and fourth material discharge channels do not overlap.

[0033] According to one embodiment of the present invention, the first fixing member is disposed on the side of the first rotating member away from the hopper, and a plurality of first scrapers are fixed on one end face of the first rotating member facing the hopper. When the first rotating member rotates, the first scrapers scrape away the corrosion inhibitor in contact with it.

[0034] According to one embodiment of the present invention, the isolation chamber is provided with a plurality of second scrapers, the second scrapers are disposed between the second rotating member and the first fixing member, one end of the second scraper is fixedly connected to the inner wall of the isolation chamber, and when the second rotating member rotates, it cooperates with the second scraper to block the corrosion inhibitor into the third leakage trough.

[0035] According to one embodiment of the present invention, the air inlet of the rotary gas compressor is connected to a gas source.

[0036] According to one embodiment of the present invention, a brake is included for braking the transmission assembly.

[0037] According to one embodiment of the present invention, the transmission component is a rotating shaft.

[0038] According to one embodiment of the present invention, the rotating component is an impeller.

[0039] A method for dispensing a molten salt corrosion inhibitor, comprising the above-mentioned molten salt corrosion inhibitor dispensing device, including:

[0040] Step 1: Close the second feeding channel and the pressurizing component, open the first feeding channel, and the corrosion inhibitor enters the isolation chamber;

[0041] Step 2: Close the first feeding channel and open the pressurization component to pressurize the isolation chamber;

[0042] Step 3: Open the second feeding channel, and the corrosion inhibitor is carried into the mixing chamber by the gas.

[0043] According to one embodiment of the present invention, the first sealing component of the first feeding channel, the second sealing component of the second feeding channel, and the pressurizing component are all driven by the rotating component.

[0044] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0045] (1) In this embodiment of the invention, a silo, a mixing chamber, a first feeding channel, a first sealing component, a rotating component, and a transmission component are provided. During the flow of the working fluid, the rotating component is driven to rotate, and then the first sealing component is driven to rotate through the transmission component. When the first sealing component rotates, the first feeding channel is periodically opened or closed, and the corrosion inhibitor enters the mixing chamber through the first feeding channel to mix with the working fluid. That is to say, the rotation of the transmission component is driven by the flow kinetic energy of the working fluid itself, realizing automatic and periodic feeding without the need for additional power. The working fluid can always be in working state during the feeding process, ensuring the safety of the system's long-term operation. Moreover, the rotation speed of the first sealing component changes with the flow rate of the working fluid, so that the frequency of opening the first feeding channel changes with the flow rate of the working fluid. That is to say, the frequency and amount of corrosion inhibitor feeding correspond to the flow rate of the working fluid, satisfying the dynamic matching of corrosion inhibitor and working fluid.

[0046] (2) In this embodiment of the invention, an isolation chamber, a second feeding channel, and a second sealing component are provided. The first feeding channel and the second feeding channel are opened or closed alternately. The corrosion inhibitor first enters the isolation chamber through the first feeding channel, and then the first feeding channel is closed and the second feeding channel is opened, so that the corrosion inhibitor enters the mixing chamber. The isolation chamber prevents the working medium in the mixing chamber from back-permeating into the silo.

[0047] (3) In this embodiment of the invention, a pressurizing component is provided. The pressurizing component introduces gas into the isolation chamber to pressurize it, and then blows the corrosion inhibitor into the mixing chamber through the gas. The gas increases the kinetic energy of the corrosion inhibitor, making it more uniformly mixed with the working fluid, and the feeding is faster and more efficient.

[0048] (4) In this embodiment of the invention, the inflation channel is located in the transmission component. The pressurization component fills the isolation chamber with gas through the inflation channel, so that the transmission component can both play a transmission role and fill the isolation chamber with gas, making the overall structure more compact and saving costs.

[0049] (5) In the embodiment of the present invention, when the transmission component rotates, the air outlet and the connection hole periodically coincide or misalign, realizing periodic air filling. When the first feeding channel is opened, the connection hole and the air outlet do not coincide, and the gas cannot enter so that the corrosion inhibitor can fall smoothly into the isolation chamber.

[0050] (6) In this embodiment of the invention, the pressurizing component is a rotary gas compressor. The rotary gas compressor is driven by a transmission component, so that the power source of the pressurizing component is also the working fluid.

[0051] (7) In the embodiment of the present invention, the first rotating component is fixed with a plurality of first scrapers, which can scrape apart the corrosion inhibitor and prevent the corrosion inhibitor from caking due to long-term accumulation and thus being unable to fall into the isolation chamber through the first feeding channel.

[0052] (8) In the embodiment of the present invention, when the second rotating part rotates, it cooperates with the second scraper to block the corrosion inhibitor into the third discharge groove. The second scraper can prevent the corrosion inhibitor from remaining.

[0053] (9) In this embodiment of the invention, a gas source is provided, which stores compressed gas, making the rotary gas compressor work more efficiently and increasing the pressure of the gas entering the isolation chamber, thus improving the feeding effect.

[0054] (10) In this embodiment of the invention, a brake is provided for braking the transmission component. When no corrosion inhibitor is needed, the transmission component can be stopped from rotating. In other words, the mixing chamber can always be used as a flow channel in the working process of the working medium. When no corrosion inhibitor is needed for the working medium, there is no need to transfer another transfer pipe to allow the working medium to bypass the mixing chamber, making the operation simpler and saving costs.

[0055] (11) In this embodiment of the invention, the rotating component is an impeller. The impeller can drive the transmission component to rotate through the working fluid, and can also stir the working fluid to make the corrosion inhibitor and the working fluid more uniformly mixed.

[0056] (12) In the embodiments of the present invention, the first sealing component for opening or closing the first feeding channel, the second sealing component for opening or closing the second feeding channel, and the pressurizing component for opening or closing are all driven by the rotating component, so that feeding into the working medium and pressurizing into the isolation chamber are both driven by the flowing working medium, so that the device does not require any additional power input and is more energy-efficient. Attached Figure Description

[0057] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0058] Figure 1 This is a schematic diagram of the overall structure of a molten salt corrosion inhibitor dispensing device according to the present invention;

[0059] Figure 2 This is a partially enlarged view of a molten salt corrosion inhibitor dispensing device according to the present invention;

[0060] Figure 3 This is a partially enlarged view of a screw compressor in a molten salt corrosion inhibitor dispensing device according to the present invention;

[0061] Figure 4 This is a schematic diagram of the first rotating component of a molten salt corrosion inhibitor dispensing device according to the present invention;

[0062] Figure 5 This is a schematic diagram of the first fixing component of a molten salt corrosion inhibitor dispensing device according to the present invention;

[0063] Figure 6 This is a partially enlarged view of the bushing of a molten salt corrosion inhibitor dispensing device according to the present invention;

[0064] Figure 7 This is a cross-sectional view of the bushing and rotating shaft of a molten salt corrosion inhibitor dispensing device according to the present invention;

[0065] Figure 8 This is a schematic diagram of the second rotating component of a molten salt corrosion inhibitor dispensing device according to the present invention;

[0066] Figure 9 This is a schematic diagram of the second fixing component of a molten salt corrosion inhibitor dispensing device according to the present invention.

[0067] Explanation of reference numerals in the attached figures:

[0068] 1: Mixing container; 2: Hopper; 3: Mixing chamber; 4: Working fluid inlet; 5: Working fluid outlet; 6: Isolation chamber; 7: Rotating shaft; 8: Air outlet; 9: Bushing; 10: Connecting hole; 11: Screw compressor; 12: Air outlet chamber; 13: Air inlet; 14: Screw; 15: Air source; 16: First rotating component; 17: First material discharge trough; 18: First fixing component; 19: Second material discharge trough; 20: First scraper; 21: Second rotating component; 22: Third material discharge trough; 23: Second fixing component; 24: Fourth material discharge trough; 25: Second scraper; 26: Impeller; 27: Brake; 28: Compressor air inlet; 29: Controller; 30: Feed inlet; 31: Sensor; 32: Rigid connecting rod. Detailed Implementation

[0069] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0070] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0071] See Figures 1 to 9 The core of this invention is to provide a molten salt corrosion inhibitor dispensing device, including a mixing container 1, a first feeding channel, a first sealing component, a rotating component, and a transmission component. The upper part of the mixing container 1 is a silo 2 containing corrosion inhibitor, and the lower part is a mixing chamber 3. The mixing chamber 3 is provided with a working fluid inlet 4 and a working fluid outlet 5. The working fluid enters the mixing chamber 3 from the working fluid inlet 4 and flows out to the working fluid outlet 5. The rotating component is located in the mixing chamber 3. During the flow of the working fluid, the rotating component is driven to rotate. The rotating component is driven by the transmission component to rotate the first sealing component. When the first sealing component rotates, it periodically opens or closes the first feeding channel. The corrosion inhibitor enters the mixing chamber 3 through the first feeding channel and mixes with the working fluid.

[0072] In other words, the rotation of the rotating component causes the first feeding channel to open and close periodically, achieving automatic and periodic feeding. The working fluid remains operational during the feeding process, ensuring the long-term safety of the system. Furthermore, utilizing the kinetic energy of the working fluid's flow as a power source eliminates the need for an external power source, thus saving energy. The rotation speed of the first closing component varies with the flow rate of the working fluid, causing the frequency of opening the first feeding channel to also vary with the flow rate. This means that the frequency and amount of corrosion inhibitor dosage correspond to the flow rate of the working fluid, achieving dynamic matching between the corrosion inhibitor and the working fluid.

[0073] Furthermore, the mixing container 1 has a central isolation chamber 6, located between the material hopper 2 and the mixing chamber 3. The corrosion inhibitor first enters the isolation chamber 6, and then the gas pressure in the isolation chamber 6 is increased. The gas then blows the corrosion inhibitor into the mixing chamber 3, ensuring a certain speed at which the corrosion inhibitor enters the mixing chamber 3, resulting in more uniform mixing of the corrosion inhibitor and the working fluid, and more efficient feeding. The high-pressure gas inside the isolation chamber 6 also prevents the working fluid in the mixing chamber 3 from back-permeating into the material hopper 2.

[0074] The molten salt corrosion inhibitor dispensing device of the present invention will be described in detail below:

[0075] The mixing container 1 is the main structure of the present invention. It is a cylindrical structure with a variable diameter and a hollow interior. Of course, it can also be other shapes in other embodiments, which are not limited here.

[0076] The mixing container 1 consists of a hopper 2, an isolation chamber 6, and a mixing chamber 3 from top to bottom. The lower end of the hopper 2 and the upper end of the mixing chamber 3 are respectively made of a diameter contraction structure, which are connected to the upper and lower ends of the isolation chamber 6.

[0077] Specifically, the silo 2 contains a corrosion inhibitor to prevent the working fluid from corroding the metal. In this embodiment, the working fluid is molten salt, and the corrosion inhibitor is used to prevent the molten salt from corroding the metal in the molten salt thermal storage system and the power generation system.

[0078] The upper end of the silo 2 is provided with a feed inlet 30 for the introduction of corrosion inhibitor. The upper end of the silo 2 is also provided with a sensor 31, which has the ability to detect the material height, temperature, humidity and pressure inside the silo 2 to ensure that the corrosion inhibitor meets the usage requirements.

[0079] The mixing chamber 3 has a working fluid inlet 4 at one end and a working fluid outlet 5 at the other end. Molten salt enters through the working fluid inlet 4, flows to the working fluid outlet 5, and the working fluid inlet 4 is higher than the working fluid outlet 5 to ensure the normal flow of molten salt. The mixing chamber 3 is made of a metal that is resistant to high temperatures and corrosion.

[0080] The transmission component is rotatably connected inside the mixing container 1. Specifically, in this embodiment, the transmission component is a rotating shaft 7. The rotating shaft 7 passes through the hopper 2, the isolation hopper 6, and the mixing hopper 3. The upper end of the rotating shaft 7 is rotatably connected to the top of the hopper 2, and the lower end of the rotating shaft 7 is provided with a rotating component. The rotating component is located in the molten salt. The molten salt drives the rotating component to rotate during the flow process, and the rotating component drives the rotating shaft 7 to rotate.

[0081] In this embodiment, the rotating component is an impeller 26, and the number of impellers 26 is not limited. Both the impeller 26 and the rotating shaft 7 are made of high-temperature and corrosion-resistant metal. In this embodiment, two impellers 26 are provided. In addition to utilizing the kinetic energy of the molten salt flow to rotate themselves, the impellers 26 can also stir the molten salt, making the molten salt and corrosion inhibitor mix more evenly, so that the corrosion inhibitor can play its full role. Furthermore, the working fluid inlet 4 is inclined at a certain angle to the rotating shaft 7, so that the molten salt can better drive the impeller 26 to rotate.

[0082] The first feeding channel is located between the hopper 2 and the isolation chamber 6 and is used to connect the two. The corrosion inhibitor enters the isolation chamber 6 through the first feeding channel. The first sealing component is located between the hopper 2 and the isolation chamber 6 to separate the hopper 2 and the isolation chamber 6. The rotating shaft 7 passes through and is connected to the first sealing component. Specifically, the first sealing component is a first rotating component 16, and also includes a first fixing component 18 that is adjacent to and closely attached to the first rotating component 16. Both the first rotating component 16 and the first fixing component 18 are discs and are both sleeved on the rotating shaft 7. The first rotating component 16 is located above the first fixing component 18.

[0083] The first rotating component 16 is fixedly connected to the rotating shaft 7, and its circumferential surface is rotatably sealed to the inner wall of the mixing container 1. Specifically, this can be achieved by rotating a sealing ring. The first rotating component 16 is provided with a through first material leakage groove 17. In this embodiment, four long strip-shaped circumferentially distributed first material leakage grooves 17 are provided and are opened along the radial direction of the first rotating component 16.

[0084] The circumferential surface of the first fixing member 18 is fixedly connected to the inner wall of the mixing container 1 and is rotatably sealed to the rotating shaft 7. Specifically, this can be achieved by rotating the sealing ring. The first fixing member 18 is provided with a through second material leakage groove 19. In this embodiment, a total of four elongated circumferentially distributed second material leakage grooves 19 are provided and are opened along the radial direction of the first fixing member 18.

[0085] The first material discharge trough 17 and the second material discharge trough 19 form a first feeding channel. The rotation of the rotating shaft 7 drives the first rotating component 16 to rotate. During the rotation, the first material discharge trough 17 and the second material discharge trough 19 periodically overlap or misalign. When they overlap, the first material discharge trough 17 and the second material discharge trough 19 are connected, thus opening the first feeding channel. When they misalign, the first material discharge trough 17 and the second material discharge trough 19 are closed.

[0086] Several first scraper blades 20 are also fixed on the upper surface of the first rotating member 16. The first scraper blades 20 are blade-shaped and have a rectangular cross-section. In this embodiment, each first material discharge trough 17 is provided with a first scraper blade 20 arranged along its length direction and located on the side of the first material discharge trough 17 that lags behind the rotation direction of the first rotating member 16. This allows the corrosion inhibitor to be smoothly blocked by the first scraper blades 20 and fall into the first material discharge trough 17 when the first rotating member 16 rotates. The first scraper blades 20 can also scrape apart the corrosion inhibitor. Because long-term accumulation of corrosion inhibitor will cause agglomeration, making it unable to pass through the first material discharge trough 17, the rotation of the first scraper blades 20 can cause the corrosion inhibitor to be re-dispersed into granules, allowing it to pass through the first material discharge trough 17 smoothly.

[0087] The second feeding channel is located between the isolation chamber 6 and the mixing chamber 3 and is used to connect the two. The corrosion inhibitor enters the mixing chamber 3 through the second feeding channel. A second sealing component is also provided between the isolation chamber 6 and the mixing chamber 3 to separate the isolation chamber 6 and the mixing chamber 3. The rotating shaft 7 passes through and is connected to the second sealing component. Specifically, the second sealing component is a second rotating component 21, and also includes a second fixing component 23 that is adjacent to and closely attached to the second rotating component 21. Both the second rotating component 21 and the second fixing component 23 are discs and are both sleeved on the rotating shaft 7. The second rotating component 21 is located above the second fixing component 23.

[0088] The second rotating component 21 is fixedly connected to the rotating shaft 7, and its circumferential surface is rotatably sealed to the inner wall of the mixing container 1. Specifically, this can be achieved by rotating a sealing ring. The second rotating component 21 is provided with a through third material leakage groove 22. In this embodiment, four long strip-shaped third material leakage grooves 22 are evenly distributed around the circumference and are opened along the radial direction of the second rotating component 21.

[0089] The second fixing member 23 is fixedly connected to the inner wall of the mixing container 1 on its circumferential surface and is rotatably sealed to the rotating shaft 7. Specifically, this can be achieved by rotating the sealing ring. The second fixing member 23 is provided with a through fourth material leakage groove 24. In this embodiment, a total of four elongated circumferentially distributed fourth material leakage grooves 24 are provided and are opened along the radial direction of the second fixing member 23.

[0090] The third and fourth material discharge troughs 22 and 24 form the second feeding channel. The rotation of the shaft 7 drives the second rotating component 21 to rotate. During the rotation, the third and fourth material discharge troughs 22 and 24 periodically overlap or misalign. When they overlap, the third and fourth material discharge troughs 22 and 24 are connected, opening the second feeding channel. When they misalign, the second feeding channel is closed.

[0091] Above the second rotating member 21, several second scraper blades 25 are also provided. Each second scraper blade 25 is blade-shaped with a rectangular cross-section. One end of each second scraper blade 25 is fixed to the inner wall of the mixing container 1 and is positioned close to the second rotating member 21. In this embodiment, four circumferentially distributed second scraper blades 25 are provided, and the initial positions of the second scraper blades 25 and the third discharge trough 22 are at an angle C. When the second rotating member 21 rotates, the second scraper blades 25 can scrape the corrosion inhibitor into the third discharge trough 22, preventing corrosion inhibitor residue.

[0092] Furthermore, within one rotation cycle of the rotating shaft 7, when the first feeding channel is opened, the second feeding channel is closed. This is specifically achieved by controlling the angle difference between the first material leakage trough 17, the second material leakage trough 19, the third material leakage trough 22, and the fourth material leakage trough 24. In other words, when the rotating shaft 7 drives the first rotating component 16 to rotate so that the first material leakage trough 17 and the second material leakage trough 19 coincide, the third material leakage trough 22 and the fourth material leakage trough 24 are misaligned. Conversely, when the rotating shaft 7 drives the second rotating component 21 to rotate so that the third material leakage trough 22 and the fourth material leakage trough 24 coincide, the first material leakage trough 17 and the second material leakage trough 19 are misaligned.

[0093] See Figure 4 , 58 and 9 are considered as the initial position of the rotating shaft 7. The four first material leakage grooves 17 on the first rotating component 16 are distributed on the X-axis and Y-axis. The second material leakage groove 19 on the first fixed component 18 has an angle A with the first material leakage groove 17. The four third material leakage grooves 22 on the second rotating component 21 are distributed on the X-axis and Y-axis. The fourth material leakage groove 24 on the second fixed component 23 has an angle C with the third material leakage groove 22. Angle A is less than angle C. That is to say, when the rotating shaft 7 continues to rotate counterclockwise, driving the first rotating component 16 and the second rotating component 21 to rotate, the first material leakage groove 17 on the first rotating component 16 first coincides with the second material leakage groove 19. At this time, the third material leakage groove 22 and the fourth material leakage groove 24 are misaligned. Then, it rotates again, and the third material leakage groove 22 coincides with the fourth material leakage groove 24. At this time, the first material leakage groove 17 and the second material leakage groove 19 are misaligned. In other words, the first material leakage trough 17, the second material leakage trough 19, the third material leakage trough 22, and the fourth material leakage trough 24 alternately overlap and are misaligned.

[0094] It also includes a pressurization component for filling the isolation chamber 6 with gas. During gas filling, the first feeding channel is closed, causing the gas pressure in the isolation chamber 6 to increase. When the second feeding channel opens, the gas blows the corrosion inhibitor into the mixing chamber 3, where it is injected under high pressure. Alternatively, if the initial gas flow rate is high enough to meet the speed requirements for the corrosion inhibitor to enter the mixing chamber 3, the pressurization process in the isolation chamber 6 can be omitted. The second feeding channel can be opened simultaneously with gas filling, allowing the corrosion inhibitor to be directly carried into the mixing chamber 3 by the gas. This gas-assisted mixing of the corrosion inhibitor and molten salt results in a more uniform mixture and faster, more efficient feeding.

[0095] Specifically, the hollow rotating shaft 7 forms an inflation channel. The pressurizing component introduces gas into the inflation channel of the rotating shaft 7. An air outlet 8 is located on the side wall of the rotating shaft 7 in the isolation chamber 6. A third sealing component is sleeved on and rotatably connected to the rotating shaft 7. The third sealing component has a connecting hole 10 for connecting the air outlet 8 and the isolation chamber 6. When the rotating shaft 7 rotates, the air outlet 8 and the connecting hole 10 periodically overlap or misalign. When the air outlet 8 and the connecting hole 10 overlap, the first feeding channel is closed.

[0096] Specifically, the third sealing component is a bushing 9, which is fixed inside the isolation chamber 6. In this embodiment, it is fixed to the lower end face of the first fixing member 18, or it can be fixed to the inner wall of the isolation chamber 6 through a connecting structure. A rotating shaft 7 passes through and is rotatably connected to the bushing 9. The side wall of the bushing 9 is provided with several connecting holes 10. The connecting holes 10 are at the same horizontal height as the air outlet 8. By rotating the rotating shaft 7, the connecting holes 10 and the air outlet 8 can be made to coincide and connect, so as to fill the isolation chamber 6 with gas. In this embodiment, four circumferentially distributed air outlets 8 and connecting holes 10 are provided, and the diameter of the air outlet 8 is larger than that of the connecting hole 10, so that the gas flow rate into the isolation chamber 6 is faster.

[0097] See Figure 7 ,Bundle Figure 7Assuming the rotating shaft 7 is in its initial position, by controlling the angle B between the axis of the connecting hole 10 and the air outlet 8, making angle A < angle B < angle C, the first material leakage trough 17 and the second material leakage trough 19, the air outlet 8 and the connecting hole 10, and the third material leakage trough 22 and the fourth material leakage trough 24 are sequentially overlapped. This allows the corrosion inhibitor to first enter the isolation chamber 6 through the first feeding channel, then the gas enters the isolation chamber 6, and finally the second feeding channel is opened, allowing the gas to carry the corrosion inhibitor into the mixing chamber 3.

[0098] The pressurization component is a rotary gas compressor. In this embodiment, the rotary gas compressor is a screw compressor 11, specifically a single-screw compressor. The screw compressor 11 is located at the top of the hopper 2. The outlet of the screw compressor 11 is an outlet chamber 12. The rotating shaft 7 extends into the outlet chamber 12 of the screw compressor 11 and is rigidly connected to its screw 14 coaxially. The rotation of the rotating shaft 7 drives the screw 14 to rotate, causing the screw compressor 11 to operate and draw in air. The side wall of the rotating shaft 7, located within the outlet chamber 12, is provided with an air inlet 13. The gas is compressed into high-pressure gas by the screw compressor 11 and enters its outlet chamber 12, then passes through the outlet chamber 12 and the air inlet 13 into the interior of the rotating shaft 7. In other words, the rotating shaft 7 is both the drive shaft of the screw compressor 11 and the outlet pipe.

[0099] Furthermore, the compressor inlet 28 of the screw compressor 11 is connected to a gas source 15, which stores compressed gas. The compressed gas itself has high pressure, making the screw compressor 11 work more efficiently and increasing the pressure of the gas entering the isolation chamber 6, thus improving the feeding effect. In this embodiment, the gas is an inert gas such as nitrogen to prevent the gas from reacting with the corrosion inhibitor.

[0100] The rotating shaft 7 is also fitted with a brake 27 for braking the shaft. The brake 27 is located inside the hopper 2 and is fixed to the inner wall of the hopper 2 via a rigid connecting rod 32. The brake 27 allows the rotating shaft 7 to stop rotating when no corrosion inhibitor is needed. In other words, the mixing chamber 3 can always be used as a flow channel in the molten salt operation. When no corrosion inhibitor is needed, there is no need to connect another transfer pipe to allow the molten salt to bypass the mixing chamber 3, making operation simpler and more cost-effective. The brake 27 also provides support for the rotating shaft 7.

[0101] A controller 29 is also provided. A corrosion rate sensor for monitoring the molten salt corrosion rate is also provided in the mixing chamber 3. The controller 29 is connected to the corrosion rate sensor, sensor 31 and brake 27 via signal lines. The corrosion rate sensor and sensor 31 send the monitoring data to the controller 29, and the controller 29 controls the brake 27 to open or close.

[0102] Another core aspect of this invention is to provide a method for dispensing molten salt corrosion inhibitors, including the aforementioned molten salt corrosion inhibitor dispensing device, comprising:

[0103] Step 1: Close the second feeding channel and pressurization component, open the first feeding channel, and the corrosion inhibitor enters the isolation chamber 6;

[0104] Step 2: Close the first feeding channel and open the pressurization component to pressurize the isolation chamber 6;

[0105] Step 3: Open the second feeding channel, and the corrosion inhibitor is carried into the mixing chamber 3 by the gas.

[0106] Furthermore, the first sealing component of the first feeding channel, the second sealing component of the second feeding channel, and the pressurizing component are all driven by the rotating component.

[0107] The working process of the dispensing device and dispensing method of the present invention will be further explained below:

[0108] First, the corrosion inhibitor is injected into the silo 2 through the feed inlet 30 and then sealed.

[0109] When the controller 29 detects through the corrosion rate sensor that the corrosion rate of the molten salt in the molten salt storage tank is higher than the safety set value, it controls the brake 27 to close, releasing the fastening of the rotating shaft 7.

[0110] High-temperature liquid molten salt enters the mixing chamber 3 through the working medium inlet 4, flows to the working medium outlet 5 and then flows out. The flowing molten salt drives the impeller 26 to rotate, and the impeller 26 drives the rotating shaft 7 to rotate. The rotating shaft 7 simultaneously drives the first rotating component 16, the second rotating component 21 and the screw compressor 11 to rotate.

[0111] Rotate counterclockwise around axis 7, and Figure 4 , 5 For example, states 7, 8, and 9 represent the initial position of rotating shaft 7 (in the initial position, the first and second feeding channels are closed, and connecting hole 10 and air outlet 8 are closed in a staggered manner):

[0112] First, the rotating shaft 7 continuously drives the screw compressor 11 to introduce compressed gas into the rotating shaft 7.

[0113] Within one rotation cycle of the rotating shaft 7, the first material discharge groove 17 on the first rotating component 16 and the second material discharge groove 19 on the first fixed component 18 gradually overlap and connect to form the first feeding channel, and the first scraper 20 drives the corrosion inhibitor particles in contact with it to make a circular motion. Due to gravity, the corrosion inhibitor particles are discharged into the isolation chamber 6 through the first feeding channel.

[0114] As the shaft 7 continues to rotate, the first material leakage trough 17 and the second material leakage trough 19 are misaligned, causing the first feeding channel to close. The connecting hole 10 and the air outlet 8 gradually overlap and connect, but not completely overlap. The dynamic gas enters the isolation chamber 6, causing the air pressure in the isolation chamber 6 to gradually increase, so that the isolation chamber 6 is pre-pressurized in a closed state (the first feeding channel and the second feeding channel are closed).

[0115] As the shaft 7 continues to rotate, the first and second material leakage channels 17 and 19 remain misaligned. The third and fourth material leakage channels 22 and 24 gradually overlap and connect to form the second feeding channel. The connecting hole 10 and the vent hole 8 remain connected. When the third and fourth material leakage channels 22 and 24 are completely aligned and overlapped, the connecting hole 10 and the vent hole 8 are also completely concentric and overlapped. At this time, the gas flow rate is at its maximum. At the same time, the second scraper 25 scrapes all the corrosion inhibitor particles scattered on the surface of the second rotating part 21 into the second feeding channel. The high-pressure gas in the isolation chamber 6 carries the corrosion inhibitor particles and sprays them into the mixing chamber 3. Then, the particles are stirred by multiple impellers 26 arranged from top to bottom in the mixing chamber 3, and the corrosion inhibitor particles are evenly mixed with the molten salt.

[0116] Then the rotating shaft 7 continues to rotate, the third material leakage trough 22 and the fourth material leakage trough 24 are misaligned to close the second feeding channel, the connecting hole 10 and the air outlet 8 are also misaligned and no longer connected, and then the work of the next rotation cycle continues.

[0117] During operation, when the controller 29 detects through the corrosion rate sensor that the corrosion rate is below the safety set value, it controls the brake 27 to tighten the rotating shaft 7 and stop the rotating shaft 7 in the initial position.

[0118] This invention enables long-term monitoring of the corrosion rate of molten salt in high-temperature molten salt storage systems, particularly in high-temperature molten salt storage tanks. It utilizes a device connected in series with the tank inlet pipe and incorporating a double-alternating sealing structure. This structure employs four discs (a first rotating component 16, a first fixed component 18, a second rotating component 21, and a second fixed component 23) for double-alternating sealing. Within one rotation cycle of the rotating shaft 7, corrosion inhibitor particles enter the isolation chamber 6 and seal. Gas is then introduced to increase the pressure within the isolation chamber 6. The isolation chamber 6 is then connected to the mixing chamber 3, and the high-pressure gas blows the corrosion inhibitor particles from the isolation chamber 6 into the mixing chamber 3. This ensures that the liquid high-temperature molten salt in the mixing chamber 3 does not flow back into the isolation chamber 6 and the storage tank 2, thus ensuring system safety.

[0119] By setting up a double alternating sealing structure, corrosion inhibitor particles (active metal particles such as Mg) are automatically added to the molten salt and mixed evenly. The corrosion inhibitor particles undergo an oxidation-reduction reaction with the corrosive impurities in the molten salt, reducing the content of corrosive impurities, slowing down the corrosion of structural metal materials by high-temperature molten salts such as chlorides or carbonates, maintaining the corrosivity of the high-temperature molten salt at a low level, and ensuring the long-term safe operation of the high-temperature thermal storage system.

[0120] By coaxially aligning the impeller 26 with the first enclosed assembly, the second enclosed assembly, and the screw compressor 11, the molten salt flow kinetic energy enables feeding operation without additional power input. In particular, the aforementioned structure, based on the linkage of different molten salt flow rates and velocities, establishes corresponding feeding frequencies, achieving efficient and uniform mixing of corrosion inhibitor particles and molten salt, meeting the dynamic requirements for corrosion protection. The rotational speed of the shaft 7 increases with the molten salt flow rate, and the gas pressure increases with the rotational speed of the shaft 7, preventing backflow caused by high-speed molten salt fluid and meeting the dynamic requirements for gas pressure.

[0121] The pre-pressurization of the isolation chamber 6 is achieved by setting up a gas and screw compressor 11 to prevent high-temperature molten salt reverse osmosis and leakage, effectively protecting the safety of the isolation chamber 6, silo 2 and other structures.

[0122] By setting a first scraper 20 to prevent corrosion inhibitor particles from clumping and a second scraper 25 to aggregate corrosion inhibitor particles, and by setting an air source 15 and a screw compressor 11, the corrosion inhibitor particles are periodically sprayed into the mixing chamber 3 using gas, thus achieving efficient delivery of corrosion inhibitor particles.

[0123] Furthermore, through the installation of controller 29, corrosion rate sensor, and brake 27, unattended operation is achieved, enabling the thermal storage system to maintain corrosion resistance for a long period of time.

[0124] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A molten salt corrosion inhibitor dosing device, characterized by, The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device.

2. The molten salt corrosion inhibitor dosing apparatus of claim 1, wherein, The application relates to a molten salt corrosion inhibitor feeding device.

3. The molten salt corrosion inhibitor dosing apparatus of claim 2, wherein, The application relates to a molten salt corrosion inhibitor feeding device. The application relates to a molten salt corrosion inhibitor feeding device.

4. The molten salt corrosion inhibitor dosing apparatus of claim 3, wherein, The application relates to a molten salt corrosion inhibitor feeding device.

5. The molten salt corrosion inhibitor dosing apparatus of claim 2, wherein, The application relates to a molten salt corrosion inhibitor feeding device.

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The application relates to a molten The first rotating member (16) is provided with a first fixed member (18) on one side, the first fixed member (18) is fixedly connected to one end of the hopper (2), the first fixed member (18) is provided with a second material leakage groove (19), and the first material leakage groove (17) and the second material leakage groove (19) cooperate to form the first feeding channel. When the first rotating member (16) rotates, the first material leakage groove (17) and the second material leakage groove (19) periodically coincide or dislocate to open or close the first feeding channel.

8. The molten salt corrosion inhibitor feeding device according to claim 7, characterized in that: The second rotating member (21) is provided on one side of the second rotating member (21), and the second rotating member (21) is fixedly connected to one end of the second rotating member (21) close to the mixing bin (3), and the second rotating member (21) is provided with a third material leakage groove (22), and the transmission assembly drives the second rotating member (21) to rotate. The second rotating member (21) is provided with a second fixed member (23) on one side, the second fixed member (23) is fixedly connected to one end of the second fixed member (23) close to the mixing bin (3), the second fixed member (23) is provided with a fourth material leakage groove (24), the third material leakage groove (22) and the fourth material leakage groove (24) cooperate to form the second feeding channel, and the second rotating member (21) rotates relative to the second fixed member (23). When the second rotating member (21) rotates, the third material leakage groove (22) and the fourth material leakage groove (24) periodically coincide or dislocate to open or close the second feeding channel, and when the first material leakage groove (17) and the second material leakage groove (19) coincide, the third material leakage groove (22) and the fourth material leakage groove (24) do not coincide.

9. The molten salt corrosion inhibitor dosing apparatus of claim 7, wherein, The first fixed member (18) is provided on the side of the first rotating member (16) away from the hopper (2), and a plurality of first scraping blades (20) are fixedly arranged on the end face of the first rotating member (16) facing the hopper (2), and when the first rotating member (16) rotates, the first scraping blades (20) scrape the corrosion inhibitor in contact therewith.

10. The molten salt corrosion inhibitor dosing apparatus of claim 8, wherein, A plurality of second scraping blades (25) are arranged in the isolation bin (6), the second scraping blades (25) are arranged between the second rotating member (21) and the first fixed member (18), one end of the second scraping blades (25) is fixedly connected to the inner wall of the isolation bin (6), and when the second rotating member (21) rotates, the second scraping blades (25) cooperate to block the corrosion inhibitor into the third material leakage groove (22).

11. The molten salt corrosion inhibitor dosing apparatus of claim 5, wherein, The gas inlet (13) of the rotary gas compressor is connected with a gas source (15).

12. The molten salt corrosion inhibitor dosing apparatus of claim 1, wherein, The transmission assembly includes a brake (27) for braking the transmission assembly.

13. The molten salt corrosion inhibitor dosing apparatus of claim 1, wherein, The transmission assembly is a rotating shaft (7).

14. The molten salt corrosion inhibitor dosing apparatus of claim 1, wherein, The rotating assembly is an impeller (26).

15. A method of molten salt corrosion inhibitor dosing comprising the molten salt corrosion inhibitor dosing device of claim 2, characterized in that, Including: Step 1: Close the second feeding channel and the pressurizing assembly, open the first feeding channel, and the corrosion inhibitor enters the isolation bin (6); Step2: close the first feeding channel, open the pressurizing assembly to pressurize the isolation bin (6); Step3: open the second feeding channel, the corrosion inhibitor is brought into the mixing bin (3) by the gas.

16. The method of claim 15, wherein the molten salt corrosion inhibitor is injected at a rate of about 0.1 to about 10 gallons per minute. The first closing assembly of the first feeding channel, the second closing assembly of the second feeding channel, and the pressurizing assembly are all driven by the rotating assembly.

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