Abrasive self-generating jet device and method using seawater crystallization and application of abrasive self-generating jet device and method

Abstract

The invention belongs to the technical field of ship rust removal, and particularly relates to an abrasive self-generating jet device and method using seawater crystallization and application, the device comprises a seawater purification system, a crystallization system connected with the seawater purification system, and an injection system connected with the crystallization system; the seawater purification system is used for sequentially carrying out desalination separation, strong brine evaporation concentration and supersaturated salt solution preparation on seawater, and the crystallization system is used for preparing an abrasive material from the supersaturated salt solution and sending the abrasive material to the injection system for spraying and derusting; the crystallization system comprises an ultrasonic crystallization controller, the ultrasonic crystallization controller is controlled by a control cabinet, the ultrasonic crystallization controller comprises a cylindrical cavity, a spoiler is arranged in the center of the cavity, a plurality of ultrasonic fractional crystallization particle size generators are arranged on the inner wall of the cavity, and each ultrasonic fractional crystallization particle size generator is electrically connected with the control cabinet; the ultrasonic fractional crystallization particle size generator comprises a large-particle-size salt crystal generation assembly located at the bottom and a small-particle-size salt crystal generation assembly located on the upper portion, and further comprises a rotating platform located on the top and a damper located above the rotating platform and provided with an ultrasonic transmitting hole. According to the invention, the supersaturated salt solution forms salt crystals with large particle size, small particle size and uniform particle size in the ultrasonic crystallization controller through the ultrasonic fractional crystallization particle size generator and the rotating platform, and seawater crystals are adopted to replace chemically synthesized abrasives or artificially prepared abrasives, so that the problem of environmental pollution caused in the use process of the abrasives can be effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of ship rust removal, and in particular relates to an abrasive self-generated jet device and method utilizing seawater crystallization and applications. Background Art

[0002] Rust removal on ships is a crucial process for ensuring the quality of ship coatings, ensuring safe navigation, and extending the ship's service life. Ships operating in marine environments for extended periods inevitably expose their hull surfaces to corrosion from seawater, salt spray, and microorganisms, leading to the formation of rust and worn coatings. Rust removal is an essential maintenance step to maintain a ship in good condition. Common methods for ship rust removal include sandblasting or shot blasting, wall-climbing robots, chemical derusting, and abrasive water jetting.

[0003] Sandblasting or shot blasting uses compressed air as a power source to spray abrasive (steel shot or sand particles) at a constant velocity onto the surface of the steel being treated. The impact and grinding action of the abrasive removes scale, rust products, and other contaminants from the steel surface. This is a highly efficient surface treatment method, but it is costly, causes significant environmental pollution, and presents safety risks. Wall-climbing robot rust removal uses a wall-climbing robot equipped with specialized tools to automatically remove rust from metal structures such as ships. However, this technology is costly, energy-intensive, and lacks stability. Chemical rust removal removes rust and scale from metal surfaces through chemical reactions. This method typically uses pickling solutions, such as sulfuric acid or hydrochloric acid, to react with rust, converting it into ferric chloride or ferric sulfate. However, this method uses large amounts of chemical reagents, which can cause significant environmental pollution, are costly, and involve the use of strong acids or other corrosive solutions, which pose safety risks. Abrasive water jet rust removal utilizes high-pressure water jet technology for rust removal. The principle is to pump the aqueous medium through a high-pressure pump, forming a high-speed stream through a water nozzle. The water jet's entrainment of the surrounding air creates a certain vacuum within the mixing chamber, which in turn generates a pressure differential in the feed pipe between the abrasive and the mixing chamber. This pressure differential draws the abrasive into the mixing chamber, where it undergoes intense turbulent diffusion and mixing with the water jet before being ejected through the abrasive nozzle to form an abrasive jet. Abrasive water jet rust removal is simple to operate, low-cost, environmentally friendly, and highly safe, demonstrating broad application potential in ship rust removal. However, it consumes a relatively high amount of fresh water.

[0004] In order to improve the consistency of ship rust removal, patent number CN202331475205.5 announced "an automatic sandblasting rust removal system and sandblasting rust removal method for ship surface rust removal". The use of sandblasting robots and abrasive recovery devices can improve the automation level of the sandblasting rust removal system, but there is still a problem of abrasive pollution. Patent number CN201711154999.5 announced "a high-pressure mist ship rust removal equipment and ship rust removal method". The use of sandblasting devices and water adding devices can suppress the dust of rust powder and meet the surface quality of steel plates required by paint coating standards, but it still does not solve the pollution caused by waste residue generated during the rust removal process. Based on the innovative idea of ​​resource utilization of seawater salt crystals, this study proposes an abrasive self-generated jet equipment and process method that uses seawater as raw material to prepare salt crystal particles as abrasive. By directly embedding seawater salt crystals into the jet system, this technology offers significant advantages over traditional abrasive jet technology: 1. Salt crystal abrasives require no additional preparation costs, significantly reducing abrasive procurement and transportation costs; 2. Utilizing natural seawater components instead of chemical or synthetic abrasives, the process eliminates the need for chemical additives and produces no secondary pollutants; 3. Salt crystals are recyclable under jet impact, further improving resource utilization. Given these combined advantages of economic efficiency, environmental friendliness, and sustainability, this equipment and process offer a new, green, and low-carbon solution for ship surface rust removal. Summary of the Invention

[0005] The present invention aims to provide an abrasive self-generated jet device and method and its application for seawater crystallization. The device primarily utilizes a reverse osmosis membrane as a seawater desalination membrane. The desalination device separates seawater into pure water and concentrated brine. The generated concentrated brine then passes through a heating chamber to become a saturated salt solution. The saturated salt solution then passes through several evenly distributed cooling chambers, where it is uniformly cooled by cooling water to obtain a supersaturated salt solution. The supersaturated solution then passes through an ultrasonic crystallization controller, which generates ultrasonic waves of varying intensities, thereby forming cavitation bubbles of varying radii. The collapse of the cavitation bubbles creates a high-temperature, high-pressure zone. The shock waves and microjets released at the moment of collapse cause severe disturbances in the surrounding liquid, leading to a sharp increase in the local concentration of solutes. Heat dissipated through heat conduction and radiation causes a sudden drop in temperature, which condenses and forms crystals. The precipitated crystals and concentrated brine are pressurized by a water pump and ejected from a nozzle to form an abrasive water jet. The above process can effectively solve the problem of abrasive contamination during ship rust removal, achieving zero environmental pollution.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A self-generated abrasive jet device utilizing seawater crystallization comprises a seawater purification system, a crystallization system connected to the seawater purification system, and an ejection system connected to the crystallization system; the seawater purification system sequentially desalinates and separates seawater, evaporates and concentrates concentrated brine, and prepares a supersaturated salt solution; the crystallization system prepares the supersaturated salt solution into abrasive and sends it to the ejection system for jetting and rust removal; the crystallization system comprises an ultrasonic crystallization controller controlled by a control cabinet, the ultrasonic crystallization controller comprising a cylindrical cavity with a spoiler provided at the center of the cavity and a plurality of ultrasonic graded crystal particle size generators provided on the inner wall of the cavity, each ultrasonic graded crystal particle size generator being electrically connected to the control cabinet, the ultrasonic graded crystal particle size generator comprising a large-size salt crystal generating component at the bottom and a small-size salt crystal generating component at the top, a rotating platform at the top, and a damper with an ultrasonic emission hole located above the rotating platform.

[0008] Furthermore, the large-size salt crystal generation component includes a piezoelectric ceramic sheet and an electrode sheet arranged in sequence, each with a hollow cavity at the center. The small-size salt crystal generation component includes a strong sound emitter with a hollow cavity at the center. A layer of sound insulation material is provided between the large-size salt crystal generation component and the small-size salt crystal generation component, and the center of the sound insulation material is also hollow. A rotating platform is provided on the top of the small-size salt crystal generation component, and a damper with an ultrasonic emission hole is provided on the top of the rotating platform. The ultrasonic emission hole is connected to the hollow cavity of the large-size salt crystal generation component and the small-size salt crystal generation component. The ultrasonic crystallization controller is a device that controls the supersaturation of the solution to promote the precipitation of solutes in the form of crystals. The ultrasonic crystallization controller includes a spoiler and an ultrasonic graded crystallization particle size generator. The spoiler mixes the supersaturated solution thoroughly and evenly; the ultrasonic crystallization controller generates ultrasonic waves of different intensities by controlling the ultrasonic frequency, thereby inducing the formation of cavitation bubbles of different energies. The ultrasonic frequency, sound intensity, sound pressure and the strength of the cavitation bubbles satisfy equations (1), (2), (3) and (4); after the cavitation bubbles collapse, a high-temperature and high-pressure zone is generated. The shock waves and microjets released at the moment of collapse cause severe disturbances in the surrounding liquid, resulting in a sharp increase in the local concentration of the solute. Heat is dissipated through heat conduction and radiation, resulting in a sudden drop in temperature, which causes condensation to form crystals. The specific crystallization process satisfies equations (5) and (6).

[0009] I=2π 2 ρcf 2 A 2 (1)

[0010]

[0011] Where I is the sound intensity (W / cm 2 ), ρ density (kg / m 3), c is the speed of sound (m / s), f is the frequency (Hz), A is the displacement amplitude (m), p is the sound pressure (Pa), P0 is the liquid static pressure (Pa), σ is the liquid surface tension (N / m), R0 is the initial bubble radius (m), P B (t) is the pressure inside the bubble (Pa), P ∞ (t) is the pressure at infinite distance from the bubble (Pa), ρ L is the density of the surrounding liquid (kg / m 3 ), R(t) is the bubble radius (m), ν L is the viscosity of the surrounding liquid (Pa.s), S is the surface tension of the bubble (N / m),

[0012]

[0013] Among them, J0 is the pre-factor (related to the molecular collision frequency), is the effective nucleation free energy barrier (J), K B is the Boltzmann constant (J / K), T is the solution temperature (k), R cav is the characteristic radius of the cavitation area (m), and γ0 is the surface energy of the crystal nucleus (J).

[0014] The ultrasonic graded crystallizer achieves precise salt crystal size grading through dual-mode control. Its core operating mechanism can be divided into the following technical paths: Mode 1 (large-size salt crystal formation): The device applies a high-frequency AC voltage to a piezoelectric ceramic transducer via electrodes, driving the piezoelectric ceramic to produce periodic mechanical expansion and contraction vibrations, thereby efficiently converting high-frequency electrical energy into mechanical vibration energy. This vibration propagates through the medium, forming a stable ultrasonic field, which triggers steady-state cavitation in the saturated salt crystallization solution. During this process, cavitation bubbles periodically expand under the negative pressure phase of the acoustic wave, forming large-scale cavitation bubbles. They then slowly contract under the positive pressure phase of the acoustic wave, avoiding violent collapse. The stable existence and periodic oscillation of large-scale cavitation bubbles provide the kinetic conditions for salt crystal growth, promoting the orderly deposition of solute molecules on the crystal nucleus surface, and ultimately producing larger salt crystals. Mode 2 (small-size salt crystal formation): Building on Mode 1, the device simultaneously superimposes a high-intensity acoustic field, significantly increasing the ultrasonic sound pressure amplitude. At this point, the cavitation bubbles undergo more intense cyclical expansion-contraction cycles under high-frequency vibration. When the acoustic pressure amplitude exceeds a critical threshold, the bubbles are driven into a violent collapse phase. The local high-temperature, high-pressure microenvironment and shock waves generated by the violent collapse destroy the already formed large-scale cavitation bubbles, causing them to fragment into micro-sized ones. These micro-cavitation bubbles are more easily compressed and collapsed during subsequent vibrations, inhibiting the excessive growth of crystal nuclei and ultimately producing smaller salt crystals. Synergistic Optimization Mode: Within the device framework of Mode 1, the coordinated regulation of pulsed cavitation and steady-state cavitation is achieved through an integrated rotating platform. The rotating platform uses periodic motion to alternate between the pulsed and steady-state cavitation phases. During the pulsed phase, ultrasonic waves are excited in the form of high-frequency pulses, generating a large number of tiny crystal nuclei in a short period of time. During the steady-state cavitation phase, the ultrasonic waves switch to a continuous wave mode, promoting the restoration of the solubility product equilibrium of the system and preventing excessive attenuation of supersaturation. This "pulse-steady state" alternating cavitation mode not only ensures the high-density generation of initial crystal nuclei, but also inhibits secondary nucleation through controllable solubility product regulation, ultimately obtaining salt crystals with uniform particle size distribution.

[0015] Furthermore, the seawater purification system includes a water tank, a water pump connected to the water tank, the water pump outlet is connected to the seawater desalination device, the seawater desalination device outlet is connected to the heating chamber, and the heating chamber outlet is connected to the cooling chamber.

[0016] Furthermore, the seawater desalination device is provided with a water inlet and a water outlet, and a plurality of vertically parallel arranged Ro reverse osmosis membranes are provided in the seawater desalination device.

[0017] Furthermore, a heating element is provided at the bottom of the heating chamber, which is a resistance wire made of nickel-chromium alloy. An inspection cover is provided at the top and middle of the heating chamber respectively, a temperature controller is also provided at the bottom, and a steam outlet is provided at the top.

[0018] Furthermore, a heating chamber entrance is provided on the top of the cooling chamber, a vertical porous diverter is provided in the heating chamber, a coolant inlet is provided on the side wall of the heating chamber, and the coolant is provided by a cooling water tank.

[0019] Furthermore, the injection system includes an injection pump and a convergent nozzle.

[0020] A jetting method of an abrasive self-generated jetting device using seawater crystallization, comprising the following steps:

[0021] S1. Connect and assemble the entire device, check the air tightness of the pipes and interfaces, turn on the water pump, observe the water pump outlet pressure indicator, and adjust the pressure;

[0022] S2. Open the ball valve of the water tank and the inlet channel of the desalination device. The seawater is divided into pure water and concentrated brine through the Ro reverse osmosis membrane. The pure water is collected for later use. Open the outlet channel of the desalination device to release the concentrated brine.

[0023] S3. Open the heating chamber inlet valve and heating element, observe the temperature in the heating chamber, and heat the brine to 80°C using the temperature controller. Observe the water level in the heating chamber through the inspection cover to ensure there are no leaks.

[0024] S4. Open the steam outlet and the heating chamber outlet valve to release water vapor and saturated salt solution, open the cooling chamber inlet valve and the cooling water tank valve, and control the solution temperature at 20°C with the temperature controller to form a supersaturated salt solution;

[0025] S5. The supersaturated salt solution passes through the ultrasonic crystallization controller, and the solute molecules in the solution form crystals under the action of the ultrasonic crystallization controller, which adjusts the water pump to form a self-generated abrasive jet for rust removal.

[0026] Another object of the present invention is to provide an application of the above method in ship rust removal.

[0027] The advantages of the present invention are:

[0028] 1. This invention uses seawater as the jet medium and salt crystals as the abrasive, eliminating the need for additional chemical agents or abrasives. Salt crystals are naturally occurring resources and can effectively address the biggest pain points of sandblasting or shot blasting for rust removal, thereby achieving efficient abrasive circulation and environmental friendliness.

[0029] 2. The device has a simple structure and is easy to arrange. It can effectively utilize the concentrated brine after desalination of seawater on board ships, thus achieving full utilization of resources.

[0030] 3. This device can adapt to the cleaning needs of surfaces of different shapes, sizes and materials by controlling parameters such as seawater flow, pressure, temperature, and jet angle and distance;

[0031] 4. This device uses ultrasonic waves to disturb the supersaturated salt solution to form salt crystals of different particle sizes. At the same time, the synergistic effect of steady-state cavitation and pulse is used to increase the crystallization rate.

[0032] 5. The present invention does not involve the use and storage of hazardous chemicals, which reduces the safety risks during operation. At the same time, the corrosiveness of seawater is relatively weak, and the requirements for equipment are not as harsh as some chemical agents, which reduces the safety hazards caused by equipment corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a process flow chart of the autogenous abrasive of the present invention.

[0034] Figure 2 It is a schematic diagram of the overall structure of the device of the present invention.

[0035] Figure 3 This is an enlarged view of the seawater purification system.

[0036] Figure 4 This is an enlarged view of the crystallization system.

[0037] Figure 5 This is an enlarged view of the heating chamber.

[0038] Figure 6 This is an enlarged view of the cooling chamber.

[0039] Figure 7 This is a partial enlarged view of the ultrasonic graded crystal particle size generator. DETAILED DESCRIPTION

[0040] like Figure 1-7As shown, an abrasive self-generated jet device using seawater crystallization includes a seawater purification system, a crystallization system connected to the seawater purification system, and an ejection system connected to the crystallization system; the seawater purification system sequentially desalinates and separates seawater, evaporates and concentrates concentrated brine, and prepares a supersaturated salt solution; the crystallization system prepares the supersaturated salt solution into abrasive and sends it to the ejection system for spraying and rust removal; the crystallization system includes an ultrasonic crystallization controller, which is controlled by a control cabinet 24. The ultrasonic crystallization controller 25 includes a cylindrical cavity with a spoiler 27 set in the center of the cavity and multiple ultrasonic graded crystallization units on the inner wall of the cavity. Particle size generator 26, each ultrasonic graded crystallization particle size generator is electrically connected to the control cabinet, the ultrasonic graded crystallization particle size generator includes a large-size salt crystal generation component at the bottom and a small-size salt crystal generation component at the top, and also includes a rotating platform at the top and a damper with an ultrasonic emission hole above the rotating platform; the large-size salt crystal generation component includes a piezoelectric ceramic sheet 35 and an electrode sheet 36 arranged in sequence, and the centers of the piezoelectric ceramic sheet and the electrode sheet are hollow cavities; the small-size salt crystal generation component includes a strong sound emitter 34, the center of the strong sound emitter is a hollow cavity, and the large-size salt crystal A layer of sound insulation material is set between the generation component and the small-particle salt crystal generation component, and the center of the sound insulation material is also hollow. A rotating platform 33 is set on the top of the small-particle salt crystal generation component, and a damper 31 with an ultrasonic emission hole 32 is set on the top of the rotating platform. The ultrasonic emission hole is connected to the hollow cavity of the large-particle salt crystal generation component and the small-particle salt crystal generation component; the seawater purification system includes a water tank 1, a water pump 3 connected to the water tank, the water pump outlet is connected to the seawater desalination device 5, the seawater desalination device outlet is connected to the heating chamber 13, and the heating chamber outlet is connected to the cooling chamber 20; the seawater desalination device is provided with A water inlet 7 and a water outlet 8 are provided in the seawater desalination device, and multiple Ro reverse osmosis membranes 6 are arranged vertically and in parallel; a heating element 10 is provided at the bottom of the heating chamber, and the heating element is a resistance wire made of nickel-chromium alloy. An inspection cover 12 is provided at the upper and middle parts of the heating chamber respectively, and a temperature controller 11 is also provided at the bottom, and a steam outlet 14 is provided at the top; a heating chamber inlet 16 is provided at the top of the cooling chamber, a vertical porous diverter 17 is provided in the heating chamber, and a coolant inlet 18 is provided on the side wall of the heating chamber, and the coolant is provided by a cooling water tank 21; the injection system includes an injection pump 29 and a convergent nozzle 30.

[0041] In specific use, an abrasive self-generated jet device using seawater crystallization includes a water tank 1, a first ball valve 2 and a first water pump 3 connected to the water tank outlet, a pressure gauge 4 between the water pump and the water inlet to monitor the pressure of the liquid in the pipeline, a seawater desalination device 5 evenly distributed with a plurality of Ro reverse osmosis membranes 6, and multiple Ro reverse osmosis membranes 6 are connected to the water inlet 7. The water tank is connected to the seawater desalination device 7, and the water flow in and out is controlled by the ball valve 2. The Ro reverse osmosis membrane is a component that separates seawater into pure water and concentrated brine through the seawater desalination device. It uses aromatic polyamide material and has excellent water permeability, high salt retention rate and good chemical stability. The first water pump 3 transports seawater through the water inlet 7 of the seawater desalination device, and the concentrated brine is discharged from the water outlet 8 of the seawater desalination device. The water outlet 8 has a second ball valve 9 to control the entry and exit of the concentrated brine into the heating chamber 13. After the concentrated brine enters the heating chamber 13, it is heated by the bottom heating element 10. The first temperature controller 11 controls the water temperature to reach 80°C. There are two inspection covers 12 in the middle of the heating chamber 13. The water level in the heating chamber is observed through the inspection cover 12 to ensure that no water leakage occurs. There is a steam outlet 14 at the top of the heating chamber 13. It is used to discharge water vapor in the heating chamber and maintain pressure balance in the heating chamber. The heating chamber 13 is connected to the seawater desalination device 5. The second ball valve 9 controls the entry and exit of the concentrated brine into the heating chamber 13. The heating element 10 is an electric heating element with a nickel-chromium alloy resistance wire, which is evenly distributed on both sides of the bottom of the heating chamber. The saturated salt solution is transported from the outlet of the heating chamber to the cooling chamber 20. The solution first passes through the cooling chamber inlet 16 and enters the diverter 17 inside the cooling chamber to evenly separate the saturated salt solution. The second water pump 23 and the regulating valve 22 are opened to extract the coolant from the cooling water tank 21 filled with coolant and enter the cooling chamber through the coolant valve 18. There is a second temperature display 19 under the valve to control the temperature of the saturated salt solution to be stable at 20°C to form a supersaturated salt solution. The cooling chamber 20 is connected to the cooling water tank 21, and the coolant is controlled to enter the cooling chamber through the regulating valve 22. The diverter is a porous diverter with multiple evenly distributed small holes or channels. It is a device for evenly distributing liquid to multiple branch pipelines. It has the characteristics of good diversion uniformity, simple and compact structure, and low pressure loss. The supersaturated salt solution enters the ultrasonic crystallization controller 25 and is fully disturbed by the spoiler 27 to reduce the solubility of the solution. The control cabinet 24 controls the electrode 36 in the ultrasonic graded crystallization particle size generator 26 to form a voltage frequency of 20kHz. The external voltage is applied to the surface of the piezoelectric ceramic 35 to form an electric field, which excites the mechanical vibration of the piezoelectric ceramic 35 to form an ultrasonic wave with a vibration frequency of 20kHz and a sound pressure of 1.73MPa, which exceeds the sound pressure amplitude of 1.54MPa that produces the cavitation effect. When the generated ultrasonic wave propagates in the liquid through the ultrasonic emission hole 32, alternating high-pressure and low-pressure areas are generated.The low-pressure zone forms tiny bubbles (cavitation bubbles), while the high-pressure zone causes them to collapse violently, instantly releasing enormous energy, destroying the solution's supersaturation and promoting salt crystal formation. When only the piezoelectric ceramic 35 is activated, steady-state cavitation occurs in the supersaturated solution. This cavitation results in periodic oscillation of bubbles, forming uniform salt crystals. Adjusting the control cabinet 24 generates ultrasonic waves with a vibration frequency of 1 MHz, and then activating the high-intensity acoustic transmitter 34 to create a high-intensity sound field, resulting in 6 MHz ultrasonic waves. The sound intensity of the enhanced ultrasonic wave exceeds 30W / cm2, reaching the threshold of transient cavitation, generating violent bubbles, which quickly collapse to form a large amount of salt crystals, greatly increasing the abrasive generation rate; finally, the electrode 36 and the piezoelectric ceramic 35 are first turned on to generate steady-state cavitation, and then the rotating platform 33 is turned on to rotate the damping 31 to form a pulsed ultrasonic wave. The pulsed ultrasonic wave instantly releases huge energy, generates violent shear force, inhibits the excessive growth of single crystals, and finally forms crystals with smaller particle size; the self-generated abrasive formed by the ultrasonic crystallization controller 25 is ejected through the nozzle 30 to form a self-generated abrasive jet to remove rust from the ship to be processed.

Claims

1. An abrasive self-generated jet device utilizing seawater crystallization, characterized in that: The invention comprises a seawater purification system, a crystallization system connected to the seawater purification system, and an ejection system connected to the crystallization system; the seawater purification system sequentially desalinates and separates seawater, evaporates and concentrates concentrated brine, and prepares a supersaturated salt solution; the crystallization system prepares the supersaturated salt solution into abrasive and sends it to the ejection system for spraying and rust removal; the crystallization system comprises an ultrasonic crystallization controller, which is controlled by a control cabinet. The ultrasonic crystallization controller comprises a cylindrical cavity with a spoiler arranged in the center of the cavity and a plurality of ultrasonic graded crystal particle size generators arranged on the inner wall of the cavity, each ultrasonic graded crystal particle size generator being electrically connected to the control cabinet. The ultrasonic graded crystal particle size generator comprises a large-particle size salt crystal generating component at the bottom and a small-particle size salt crystal generating component at the top, as well as a rotating platform at the top and a damper with an ultrasonic emission hole located above the rotating platform.

2. The abrasive self-generated jet device utilizing seawater crystallization according to claim 1, characterized in that: The large-particle salt crystal generating component includes a piezoelectric ceramic sheet and an electrode sheet arranged in sequence, and the centers of the piezoelectric ceramic sheet and the electrode sheet are hollow cavities; the small-particle salt crystal generating component includes a strong sound emitter, and the center of the strong sound emitter is a hollow cavity. A layer of sound insulation material is arranged between the large-particle salt crystal generating component and the small-particle salt crystal generating component, and the center of the sound insulation material is also hollow. A rotating platform is provided on the top of the small-particle salt crystal generating component, and a damper with an ultrasonic transmitting hole is provided on the top of the rotating platform. The ultrasonic transmitting hole is connected to the hollow cavities of the large-particle salt crystal generating component and the small-particle salt crystal generating component.

3. The abrasive self-generated jet device utilizing seawater crystallization according to claim 1, characterized in that: The seawater purification system includes a water tank, a water pump connected to the water tank, an outlet of the water pump connected to a seawater desalination device, an outlet of the seawater desalination device connected to a heating chamber, and an outlet of the heating chamber connected to a cooling chamber.

4. The abrasive self-generated jet device utilizing seawater crystallization as claimed in claim 3, characterized in that: The seawater desalination device is provided with a water inlet and a water outlet, and a plurality of Ro reverse osmosis membranes arranged vertically and in parallel are arranged in the seawater desalination device.

5. The abrasive self-generated jet device utilizing seawater crystallization as claimed in claim 3, characterized in that: A heating element is provided at the bottom of the heating chamber, which is a resistance wire made of nickel-chromium alloy. An inspection cover is provided at the top and middle of the heating chamber respectively, a temperature controller is provided at the bottom, and a steam outlet is provided at the top.

6. The abrasive self-generated jet device utilizing seawater crystallization as claimed in claim 3, characterized in that: A heating chamber entrance is provided on the top of the cooling chamber, a vertical porous diverter is provided in the heating chamber, a cooling liquid inlet is provided on the side wall of the heating chamber, and the cooling liquid is provided by a cooling water tank.

7. The abrasive self-generated jet device utilizing seawater crystallization according to claim 1, characterized in that: The ejection system includes an ejection pump and a convergent nozzle.

8. The jetting method of the abrasive self-generated jetting device using seawater crystallization according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Connect and assemble the entire device, check the air tightness of the pipes and interfaces, turn on the water pump, observe the water pump outlet pressure indicator, and adjust the pressure; S2. Open the ball valve of the water tank and the inlet channel of the desalination device. The seawater is divided into pure water and concentrated brine through the Ro reverse osmosis membrane. The pure water is collected for later use. Open the outlet channel of the desalination device to release the concentrated brine. S3. Open the heating chamber inlet valve and heating element, observe the temperature in the heating chamber, and heat the brine to 80°C using the temperature controller. Observe the water level in the heating chamber through the inspection cover to ensure there are no leaks. S4. Open the steam outlet and the heating chamber outlet valve to release water vapor and saturated salt solution, open the cooling chamber inlet valve and the cooling water tank valve, and control the solution temperature at 20°C with the temperature controller to form a supersaturated salt solution; S5. The supersaturated salt solution passes through the ultrasonic crystallization controller, and the solute molecules in the solution form crystals under the action of the ultrasonic crystallization controller, which adjusts the water pump to form a self-generated abrasive jet for rust removal.

9. The method according to claim 8 is used for rust removal of ships.

Images