Nitrogen-saving deaeration system and deaeration method for the internal cooling system of converter valves

Abstract

The present invention provides a nitrogen-saving deoxygenation system and method for the internal cooling system of a converter valve, belonging to the technical field of the internal cooling system of a power system, including: a water storage device for storing the internal cooling water to be deoxygenated; a nitrogen supply unit for injecting high-purity nitrogen into the water storage device; an aeration device for disturbing the gas-liquid and dispersing nitrogen microbubbles to achieve the mixing of nitrogen and the internal cooling water; an ultrasonic magnetization device for performing secondary deoxygenation on the cooling water preliminarily deoxygenated by the aeration device, for refining the nitrogen bubbles inside the liquid layer through ultrasonic waves, accelerating the separation of oxygen inside the internal cooling water, and accelerating the combination of aluminum ions and oxygen to form a passivation film under the induction of a magnetic field. The advantages are as follows: Through the synergistic effect of the spiral guide vane and the microporous aeration disc, turbulent disturbance and microbubble dispersion are formed, significantly increasing the contact area between nitrogen and the internal cooling water, achieving rapid primary deoxygenation and reducing nitrogen consumption; the combination of primary deoxygenation and secondary deoxygenation removes dissolved oxygen in stages, with a relatively high efficiency improvement.

Description

Technical Field

[0001] The invention belongs to the technical field of the internal cooling system of the power system, and particularly relates to a nitrogen-saving deoxygenation system for the internal cooling system of a converter valve. Background Art

[0002] The converter valve is the core key component for AC-DC conversion. When the equipment operates, a large amount of heat is generated, and a fully automatic valve cooling system is configured for circulating cooling and heat dissipation. The cooling system equipped for the converter valve is a necessary prerequisite and basic guarantee for the safe and stable operation of the converter valve. Through detection, it is found that the main components of the platinum electrode scale sample are aluminum (26%) and oxygen (40%) elements. According to the analysis of the influence of different cooling technical routes, it can be known that the oxygen (O) element mainly comes from the dissolved oxygen in the internal cooling water; according to the analysis of the material composition of the internal cooling water circuit, the aluminum (Al) element mainly comes from the thyristor cooler.

[0003] The water quality of the internal cooling water in the cooling system is also a necessary prerequisite for the safe operation of the equipment. Among them, the dissolved oxygen content in the internal cooling water is one of the important factors affecting the stable operation of the converter valve. The higher the dissolved oxygen content in the internal cooling water, the easier the platinum electrode is to scale. It is required that the dissolved oxygen in the internal cooling water must be controlled within the allowable operating range of the converter valve.

[0004] At present, a method adopted by the domestic valve cooling system is to slowly replace the dissolved oxygen in the internal cooling water with nitrogen during the natural operation process, which does not meet the requirements of rapidity and safety for the nitrogen deoxygenation function. Therefore, the inventor provides a system and a deoxygenation method for rapidly replacing the dissolved oxygen in the internal cooling water, so that the dissolved oxygen in the internal cooling water is controlled within the allowable operating range of the converter valve. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to remove oxygen from the internal cooling water of the converter valve. In view of the deficiencies of the prior art, a nitrogen-saving deoxygenation system for the internal cooling system of a converter valve capable of rapidly removing oxygen from the internal cooling water is provided. To solve the above technical problem, the technical solution adopted by the present invention is as follows: It includes a water storage device for storing the internal cooling water to be deoxygenated; a nitrogen supply unit, the outlet of which is connected to the water storage device, for injecting high-purity nitrogen into the water storage device; an aeration device, the inlet of which is respectively connected to the nitrogen supply unit and the water storage device, and includes a spiral guide vane and a microporous aeration disk, for disturbing the gas-liquid and dispersing nitrogen microbubbles to realize the mixing of nitrogen and the internal cooling water; an ultrasonic magnetization device for secondarily deoxygenating the cooling water preliminarily deoxygenated by the aeration device, including a tank body, and a liquid layer is arranged inside the tank body; an ultrasonic cavitation-magnetization reactor is arranged inside the tank body, and the ultrasonic cavitation-magnetization reactor is used to refine the nitrogen bubbles inside the liquid layer through ultrasonic waves, accelerate the separation of oxygen inside the internal cooling water, and accelerate the combination of aluminum ions and oxygen to form a passivation film under the induction of a magnetic field.

[0006] Further, the pore diameter of the microporous aeration disk is 50 - 100 μm, and the pore density ≥ 200 pores / cm².

[0007] Further, a mixing layer is provided inside the tank body, a gas outlet is provided at the top of the tank body, the mixing layer is located above the liquid layer, an atomization assembly is provided inside the tank body, and the atomization assembly is used to extract the coolant in the liquid layer, atomize it and spray it into the mixing layer.

[0008] Further, the ultrasonic cavitation - magnetization reactor includes ultrasonic transducers annularly arranged at the bottom of the tank body and permanent magnets arranged in a Halbach array, and the side surface of the tank body is arc-shaped;

[0009] A ejector is provided at the outlet of the aeration device, the outlet end of the aeration device is connected to the liquid layer of the tank body through the ejector, the ejection direction of the ejector is to eject along the side wall of the tank body at an acute angle with the bottom of the tank body, and the ejector is used to drive the liquid layer to flow and generate a swirl.

[0010] Further, it further includes a nitrogen recovery device: the air inlets are respectively connected to the water storage device and the air outlet of the tank body, a gas - liquid separator is provided at the outlet of the nitrogen recovery device, the outlet of the gas - liquid separator is connected to the inside of the tank body, an oxygen remover is connected to the outlet of the nitrogen recovery device, and the outlet of the oxygen remover is connected to the nitrogen supply unit.

[0011] Further, a dissolved oxygen sensor and a pressure regulation module are provided inside the water storage device, the dissolved oxygen sensor is used to detect the oxygen content in the water and the air inside the water storage device box respectively, and the pressure regulation module is used to regulate the pressure of the water storage device supplied to the nitrogen supply unit.

[0012] An efficient deoxygenation method for the internal cooling water system of a converter valve, which is completed based on the nitrogen - saving deoxygenation system of the internal cooling water system of the converter valve, is characterized in that it includes the following steps:

[0013] Inject high - purity nitrogen into the water storage device to displace the air;

[0014] Store the internal cooling water to be treated in a closed water storage device;

[0015] Inject the internal cooling water and nitrogen into the aeration device at a set pressure;

[0016] Disperse nitrogen in the form of micro - bubbles through aeration and ultrasonic cavitation to deoxygenate the cooling water;

[0017] The deoxygenated cooling water returns to the internal cooling system.

[0018] Further, the method of dispersing nitrogen in the form of micro - bubbles through aeration and ultrasonic cavitation to deoxygenate the cooling water includes:

[0019] Turbulent disturbances are generated by spiral guide vanes, and at the same time, a microporous aeration disk is used for nitrogen microbubble dispersion to achieve primary deoxidation of gas-liquid mixing;

[0020] The cooled water and nitrogen after primary deoxidation are introduced into an ultrasonic magnetization device, and the nitrogen bubbles are refined by ultrasonic cavitation to accelerate oxygen separation;

[0021] The coolant with pressure from the aeration device enters the ultrasonic magnetization device to drive the internal coolant to form a swirl, extending the contact time of gas-liquid;

[0022] Under the induction of a gradient magnetic field, the combination of aluminum ions and residual oxygen is accelerated to generate a passivation film.

[0023] Furthermore, the method of deoxygenating the cooled water by dispersing nitrogen in the form of microbubbles through aeration and ultrasonic cavitation further includes:

[0024] The atomization component extracts the coolant in the liquid layer, atomizes the coolant and sprays it towards the mixing layer, and after the separation of nitrogen and the coolant, it rises into the mixing layer for secondary deoxygenation.

[0025] Furthermore, the ultrasonic treatment uses a high-frequency vibration of 20 - 40 kHz and an acoustic intensity of 1.5 - 3 W / cm²;

[0026] The magnetic field treatment uses a Halbach array to generate a gradient magnetic field of 0.5 - 1.2 T;

[0027] The liquid is driven to form a swirl by acute-angle injection, and the rotation speed is controlled at 100 - 300 rpm.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. Through the synergistic effect of the spiral guide vanes and the microporous aeration disk, turbulent disturbances and microbubble dispersion are formed, significantly increasing the contact area between nitrogen and internal cooling water, achieving rapid primary deoxidation and reducing nitrogen consumption; the combination of primary deoxidation (aeration disturbance) and secondary deoxidation (ultrasonic magnetization, swirl atomization) removes dissolved oxygen in stages, and the efficiency is much higher than that of traditional natural replacement;

[0030] 2. The ultrasonic cavitation-magnetization reactor refines nitrogen bubbles to the micron level, accelerating the separation of oxygen from water; the Halbach array permanent magnet induces the combination of aluminum ions and residual oxygen to generate a dense passivation film, and the ultrasonic cavitation-magnetization reactor refines nitrogen bubbles to the micron level, accelerating the separation of oxygen from water; the residual oxygen concentration can be reduced to below 0.1 mg / L, and the dual effect reduces the dissolved oxygen content to below the safety threshold;

[0031] 3. The ejector drives the liquid to form a swirl at an acute angle, and combines with the atomization component to atomize and spray the coolant into the mixing layer, extending the gas-liquid contact time to achieve secondary deep deoxidation;

[0032] 4. The Halbach array permanent magnet induces aluminum ions to combine with residual oxygen to form a dense passivation film. The ultrasonic cavitation (high-frequency vibration + high sound intensity) is matched with the gradient magnetic field (Halbach array) parameters to accelerate the oxygen separation and the formation of the passivation film. The passivated alumina is relatively stable. After filtration, the content of aluminum ions in the internal cooling water can be removed, reducing the scaling of aluminum ions on the platinum electrode while reducing the scaling of oxygen on the platinum electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Figure 1 : Schematic diagram of the system in Embodiment 1 of the present invention;

[0035] Figure 2 : Schematic diagram of the method flow in Embodiment 2 of the present invention;

[0036] Among them, 1. Water storage device; 11. Dissolved oxygen sensor; 12. Pressure regulation module; 2. Nitrogen supply unit; 3. Aeration device; 31. Spiral guide vane; 32. Microporous aeration disk; 4. Ultrasonic magnetization device; 41. Tank body; 42. Atomization component; 43. Ultrasonic transducer; 44. Permanent magnet; 45. Injector; 5. Nitrogen recovery device; 51. Gas-liquid separator; 52. Deaerator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to better understand the present invention, the content of the present invention will be further clearly described below in conjunction with the embodiments and the accompanying drawings. However, the protection scope of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0038] Embodiment 1: Refer to Figure 1 , a nitrogen-saving deoxygenation system for the internal cooling system of a converter valve in this embodiment, which includes:

[0039] A water storage device 1 for storing the internal cooling water to be deoxygenated; the internal cooling water to be treated is injected into the closed water storage device 1, and the dissolved oxygen content in the water is monitored in real time through the dissolved oxygen sensor 11;

[0040] A nitrogen supply unit 2, the outlet of which is connected to the water storage device 1, for injecting high-purity nitrogen (purity ≥ 99.99%) into the water storage device 1 to displace the air in the box;

[0041] The aeration device 3 has inlets connected to the nitrogen supply unit 2 and the water storage device 1, respectively. It includes a spiral guide vane 31 and a microporous aeration disk 32, which are used to disturb the gas-liquid and nitrogen microbubble dispersion to achieve mixing of nitrogen and internal cooling water. The internal cooling water and nitrogen in the water storage device 1 enter the aeration device 3 through a pipe. The spiral guide vane 31 generates turbulent disturbances, and the microporous aeration disk 32 disperses the nitrogen into 50-100 μm microbubbles. After the gas and liquid are mixed, oxygen is discharged along with the nitrogen.

[0042] Ultrasonic magnetization device 4: used for secondary deoxygenation of the cooling water after the initial deoxygenation by the aeration device 3, comprising a tank body 41, the interior of which is provided with a liquid layer. The cooling water after the initial deoxygenation enters the tank body 41 of the ultrasonic magnetization device 4, and the liquid outlet of the tank body 41 is connected to the internal cooling system;

[0043] An ultrasonic cavitation-magnetization reactor is installed inside the tank 41. The ultrasonic cavitation-magnetization reactor is used to refine the nitrogen bubbles inside the liquid layer through ultrasonic waves. Ultrasonic cavitation (40kHz, 2.5W / cm²) refines the nitrogen bubbles to the micron level, accelerating the separation of oxygen inside the internal cooling water. Under the induction of the magnetic field, it accelerates the combination of aluminum ions and oxygen to form a passivation film. The Halbach array permanent magnet 44 in the ultrasonic cavitation-magnetization reactor generates a 0.8T gradient magnetic field, and the aluminum ions combine with residual oxygen to form an Al2O3 passivation film. The deoxidized cooling water returns to the internal cooling system.

[0044] See Figure 1 The microporous aeration discs 32 are made of titanium alloy, with a pore size of 80 μm and a pore density of 250 pores / cm². Multiple sets of microporous aeration discs 32 and spiral guide vanes 31 are interlaced within the aeration device 3. When nitrogen passes through the aeration discs, uniform microbubbles are formed, with a bubble diameter controlled at 50-120 μm, increasing the gas-liquid contact area.

[0045] See Figure 1 Tank 41 also contains a mixing layer. A gas outlet is located at the top of tank 41, and the mixing layer is located above the liquid layer. Tank 41 also houses an atomizer assembly 42 (a pressure nozzle). This assembly extracts coolant from the liquid layer and atomizes it into 20-50μm droplets at a pressure of 10MPa, which are then sprayed into the mixing layer. Nitrogen, carrying residual oxygen, rises to the mixing layer, where it countercurrently contacts the atomized droplets. This increases the gas-liquid mass transfer area, increasing the deoxygenation contribution of the mixing layer by 15%.

[0046] See Figure 1 The ultrasonic cavitation-magnetization reactor includes six groups of ultrasonic transducers 43 arranged in a ring at the bottom of a tank 41 and permanent magnets 44 arranged in a Halbach array. The side walls of the tank 41 are curved. The swirl flow plus ultrasound refines the nitrogen bubbles to less than 10 μm, increasing the oxygen separation rate by 50%. The magnetic field accelerates the formation of the passivation film to twice the rate of acceleration without a magnetic field.

[0047] A ejector 45 is provided at the outlet of the aeration device 3. The ejection port of the ejector 45 penetrates into the interior of the tank body 41. The outlet end of the aeration device 3 is connected to the liquid layer of the tank body 41 through the ejector 45. The outlet end of the aeration device 3 is connected to the liquid layer of the tank body 41 through the ejector 45. The ejector 45 ejects the coolant towards the tank wall at an ejection angle of 23 - 45° with respect to the bottom surface of the tank body 41. The ejector 45 is used to drive the flow of the liquid layer to generate a swirl, drive the liquid to form a swirl of 200 rpm, and extend the gas-liquid residence time to 5 minutes.

[0048] Refer to Figure 1 , and it further includes a nitrogen recovery device 5: the inlet is respectively connected to the outlet of the water storage device 1 and the outlet of the tank body 41. A gas-liquid separator 51 is provided at the outlet of the nitrogen recovery device 5. The outlet of the gas-liquid separator 51 is connected to the interior of the tank body 41. The nitrogen discharged from the water storage device 1 and the tank body 41 enters the gas-liquid separator 51 to remove moisture. A deaerator 52 is connected to the outlet of the nitrogen recovery device 5. The outlet of the deaerator 52 is connected to the nitrogen supply unit 2. Residual oxygen is removed by the deaerator 52 (palladium catalyst), and the purified nitrogen returns to the nitrogen supply unit 2, with a recovery rate ≥ 90%.

[0049] Refer to Figure 1 , a dissolved oxygen sensor 11 and a pressure regulation module 12 are provided inside the water storage device 1. The dissolved oxygen sensor 11 is used to detect the oxygen content in the water and the air inside the water storage device 1 box respectively. The pressure regulation module 12 is used to regulate the pressure supplied by the nitrogen supply unit 2 to the water storage device 1 and the aeration device 3. The dissolved oxygen sensor 11 (optical fluorescence method) monitors the oxygen content in the water body and the gas phase in the water storage device 1 in real time, and the data is fed back to the PLC controller to dynamically adjust the nitrogen supply pressure (adjustable from 0.2 - 0.5 MPa) to maintain the oxygen content ≤ 0.2 mg / L.

[0050] In this embodiment, through the synergistic effect of the spiral guide vane and the microporous aeration disk (pore diameter 50 - 100 μm, pore density ≥ 200 pores / cm²), turbulent disturbance and microbubble dispersion are formed, significantly increasing the contact area between nitrogen and the internal cooling water, achieving rapid primary deoxidation, and reducing nitrogen consumption. The ultrasonic cavitation - magnetization reactor refines nitrogen bubbles to the micron level, accelerating the separation of oxygen from water; the Halbach array permanent magnet induces aluminum ions to combine with residual oxygen to form a dense passivation film, and the dual action reduces the dissolved oxygen content below the safety threshold. The nitrogen recovery device combines a gas-liquid separator and a deaerator to realize the recycling of nitrogen, with a nitrogen recovery and reuse rate of more than 85%, reducing the operating cost. The ejector drives the liquid to form a swirl at an acute angle, and combines with the atomization component to atomize and spray the coolant into the mixing layer, extending the gas-liquid contact time to achieve secondary deep deoxidation. The dissolved oxygen sensor monitors the oxygen content in the water and inside the water storage device in real time, and the pressure regulation module dynamically adjusts the nitrogen supply pressure to form a closed-loop control, ensuring the rapid response and stable operation of the system.

[0051] Embodiment 2: An efficient deoxygenation method for the internal cooling water system of a converter valve, which is implemented based on the nitrogen-saving deoxygenation system of the internal cooling water system of the converter valve as in Embodiment 1. Refer to Figure 2 , which includes the following steps:

[0052] Inject high-purity nitrogen into the water storage device to displace air and adjust to an oxygen content < 1%;

[0053] Store the internal cooling water to be treated in a closed water storage device;

[0054] Inject the internal cooling water and nitrogen into the aeration device at a set pressure;

[0055] Disperse nitrogen in the form of microbubbles through aeration and ultrasonic cavitation to deoxygenate the cooling water;

[0056] The deoxygenated cooling water returns to the internal cooling system.

[0057] Refer to Figure 2 , the method of dispersing nitrogen in the form of microbubbles through aeration and ultrasonic cavitation to deoxygenate the cooling water includes:

[0058] Generate turbulent disturbance through spiral guide vanes, and at the same time use a microporous aeration disk for nitrogen microbubble dispersion to achieve primary deoxygenation of gas-liquid mixing; the internal cooling water and nitrogen enter the aeration device 3 at a pressure of 0.3 MPa, and 70% of the dissolved oxygen is removed under turbulent disturbance;

[0059] Introduce the cooling water and nitrogen after primary deoxygenation into the ultrasonic magnetization device, and refine the nitrogen bubbles through ultrasonic cavitation to accelerate oxygen separation;

[0060] The coolant with pressure from the aeration device enters the ultrasonic magnetization device to drive the internal coolant to form a swirl, extending the contact time of gas-liquid. The cooling water is treated by ultrasonic cavitation and swirl in the tank body 41, and the deoxygenation rate is increased to 95%;

[0061] Under the induction of a gradient magnetic field, accelerate the combination of aluminum ions and residual oxygen to form a passivation film.

[0062] Refer to Figure 2 , the method of dispersing nitrogen in the form of microbubbles through aeration and ultrasonic cavitation to deoxygenate the cooling water also includes:

[0063] The atomization component sprays atomized droplets in a pulse mode, atomizes the coolant and sprays it towards the mixing layer, forms a gas-liquid countercurrent with the rising nitrogen in the mixing layer for secondary deoxygenation, and the atomization spray increases the removal rate of residual oxygen by another 10%, and the final oxygen content ≤ 0.05 mg / L.

[0064] Refer to Figure 2, ultrasonic treatment uses high-frequency vibration of 20 - 40 kHz, with an acoustic intensity of 1.5 - 3 W / cm², and the cavitation effect generates local high temperature (5000K) to break bubbles;

[0065] Magnetic field treatment uses a Halbach array to generate a gradient magnetic field of 0.5 - 1.2 T, and the migration rate of aluminum ions is increased by 3 times;

[0066] The liquid is driven to form a swirl by acute-angle injection, and the rotation speed is controlled at 100 - 300 rpm to extend the gas-liquid contact time.

[0067] In this embodiment, through the combination of primary deoxidation (aeration disturbance) and secondary deoxidation (ultrasonic magnetization, swirl atomization), dissolved oxygen is removed in stages, and the efficiency is improved significantly compared with traditional natural replacement; the parameters of ultrasonic treatment (high-frequency vibration + high acoustic intensity) and gradient magnetic field (Halbach array) are matched to accelerate oxygen separation and the formation of a passivation film, and the residual oxygen concentration can be reduced to less than 0.1 mg / L; the whole process of nitrogen injection, swirl drive, and atomization spraying is automatically controlled to reduce human operation errors and meet the continuous operation requirements of the converter valve;

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention shall be covered by the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A nitrogen-saving deaeration system for the internal cooling system of a converter valve, characterized in that Comprising: A water storage device (1) for storing the inner cooling water to be deoxygenated; A nitrogen supply unit (2) with its outlet connected to the water storage device (1) for injecting high-purity nitrogen into the water storage device (1); An aeration device (3) with its inlet connected to the nitrogen supply unit (2) and the water storage device (1) respectively, including a spiral guide vane (31) and a microporous aeration disk (32), for disturbing the gas-liquid and dispersing nitrogen microbubbles to achieve the mixing of nitrogen and inner cooling water. The aperture of the microporous aeration disk (32) is 50 - 100 μm, and the pore density ≥ 200 pores / cm²; Multiple groups of the microporous aeration disks (32) are arranged alternately with the spiral guide vane (31) inside the aeration device 3, and the spiral guide vane (31) is used to generate turbulent disturbance; An ultrasonic magnetization device (4) for secondary deoxygenation of the cooling water preliminarily deoxygenated by the aeration device (3), including a tank body (41), with a liquid layer arranged inside the tank body (41), and the liquid outlet of the tank body (41) is connected to the inner cooling system; An ultrasonic cavitation - magnetization reactor is arranged inside the tank body (41), and the ultrasonic cavitation magnetization reactor is used to refine the nitrogen bubbles inside the liquid layer through ultrasonic waves, accelerate the separation of oxygen inside the inner cooling water, and accelerate the combination of aluminum ions and oxygen to form a passivation film under the induction of a magnetic field; The ultrasonic cavitation - magnetization reactor includes an ultrasonic transducer (43) annularly arranged at the bottom of the tank body (41) and permanent magnets (44) arranged in a Halbach array, and the side surface of the tank body (41) is arc-shaped; A jet (45) is arranged at the outlet of the aeration device (3), the side wall of the tank body (41) is arc-shaped, and the jet (45) jets the coolant towards the arc-shaped tank wall at a jet angle of 23 - 45° with the bottom surface of the tank body (41). The outlet end of the aeration device (3) is connected to the liquid layer of the tank body (41) through the jet (45), and the jet direction of the jet (45) is to jet along the side wall of the tank body (41) at an acute angle with the bottom of the tank body (41). The jet (45) is used to drive the flow of the liquid layer to generate a swirl; 2. The nitrogen-saving deoxygenation system for the internal cooling system of the converter valve according to claim 1, characterized in that A mixing layer is arranged inside the tank body (41), a gas outlet is arranged at the top of the tank body (41), the mixing layer is located above the liquid layer, and an atomization component (42) is arranged inside the tank body (41), and the atomization component (42) is used to extract the coolant of the liquid layer, atomize it and spray it into the mixing layer; 3. The nitrogen-saving deoxidation system for the internal cooling system of the converter valve according to claim 1, characterized in that, It further includes a nitrogen recovery device (5): The air inlet is connected to the water storage device (1) and the air outlet of the tank body (41) respectively. The outlet of the nitrogen recovery device (5) is provided with a vapor - liquid separator (51), the outlet of the vapor - liquid separator (51) is connected to the inside of the tank body (41), the outlet of the nitrogen recovery device (5) is connected to a deaerator (52), and the outlet of the deaerator (52) is connected to the nitrogen supply unit (2).

4. The nitrogen-saving deoxidation system for the internal cooling system of the converter valve according to claim 1, characterized in that, Inside the water storage device (1), a dissolved oxygen sensor (11) and a pressure regulation module (12) are provided. The dissolved oxygen sensor (11) is used to detect the oxygen content in water and the air inside the water storage device (1) box respectively. The pressure regulation module (12) is used to regulate the pressure of the water storage device (1) supplied to the nitrogen supply unit (2).

5. An efficient deoxygenation method for the internal cooling system of a converter valve, based on the converter valve described in any one of claims 1-2 The cold system nitrogen-saving deaeration system is completed, characterized in that, comprises the following steps: Inject high-purity nitrogen into the water storage device to displace air; Store the internal cooling water to be treated in a closed water storage device; Inject the internal cooling water and nitrogen into the aeration device at a set pressure; Disperse nitrogen in the form of microbubbles through aeration and ultrasonic cavitation to deoxygenate the cooling water; The deoxygenated cooling water returns to the internal cooling system; The method of dispersing nitrogen in the form of microbubbles through aeration and ultrasonic cavitation to deoxygenate the cooling water includes: generating turbulent disturbance through spiral guide vanes, and at the same time using a microporous aeration disk to disperse nitrogen microbubbles to achieve primary deoxygenation of gas-liquid mixing; Introduce the cooling water and nitrogen after primary deoxygenation into the ultrasonic magnetization device. Refine nitrogen bubbles through ultrasonic cavitation to accelerate oxygen separation; the coolant with pressure from the aeration device enters the ultrasonic magnetization device to drive the internal coolant to form a swirl, extending the contact time of gas-liquid; under the induction of a gradient magnetic field, accelerate the combination of aluminum ions and residual oxygen to form a passivation film.

6. The method for efficiently removing oxygen in the internal cooling system of the converter valve according to claim 5, characterized in that, The method of dispersing nitrogen in the form of microbubbles through aeration and ultrasonic cavitation to deoxygenate the cooling water further includes: The atomization component extracts the coolant in the liquid layer, atomizes the coolant and sprays it into the mixing layer. After the separation of nitrogen and the coolant, it rises into the mixing layer for secondary deoxygenation.

7. The high-efficiency deoxygenation method for the internal cooling system of a converter valve according to claim 5, wherein The ultrasonic cavitation uses a high-frequency vibration of 20-40 kHz and an acoustic intensity of 1.5-3 W / cm²; The magnetic field treatment uses a Halbach array to generate a gradient magnetic field of 0.5-1.2 T; Drive the liquid to form a swirl through acute-angle injection, and the rotation speed is controlled at 100-300 rpm.

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