A method of deaerating a cooling system

Abstract

The application discloses a cooling system oxygen removal method, relates to the technical field of pure water oxygen removal, and comprises a purging gas system composed of a nitrogen cylinder and an electromagnetic valve connected in sequence through a pipeline, a vacuum system composed of a water ring vacuum pump, a gas-liquid separator and a plate heat exchanger connected in sequence through a pipeline, a circulating water system composed of a first electric two-way valve and an oxygen removal membrane assembly connected in sequence through a pipeline, and a control device for realizing automatic oxygen removal control of a converter valve cooling system by controlling the purging gas system, the vacuum system and the circulating water system. The application has the beneficial effect of providing the converter valve cooling system with online and offline oxygen removal methods. When the online method is used, the oxygen removal device automatically operates to remove oxygen without manual operation, thereby meeting the full-automatic and real-time oxygen removal requirements of the cooling system. When the offline method is used, the oxygen removal device can be used as a tool as required, and the two modes are combined to meet the use requirements in different occasions.

Description

Technical Field

[0001] This invention relates to the field of pure water deoxygenation technology, and in particular to a method for deoxygenating a cooling system. Background Technology

[0002] Dissolved oxygen in the cooling system of ultra-high voltage direct current converter valves can corrode metal components such as valve cooling system pipes and radiators, reducing system lifespan and operational reliability.

[0003] Currently, the deoxygenation method for the converter valve cooling system is as follows: During the commissioning phase, deoxygenating resin is manually filled into the ion exchange tank. Dissolved oxygen in the cooling system reacts chemically with the deoxygenating resin. Once the dissolved oxygen content in the system drops below the target value, the deoxygenating resin is manually replaced with deionized resin. During system maintenance or annual inspection, the dissolved oxygen meter is monitored on-site. If the dissolved oxygen level is higher than the target value, nitrogen aeration is manually performed to reduce the dissolved oxygen level in the system below the target value. This method is time-consuming, consumes a large amount of manpower, and cannot maintain the system's dissolved oxygen level below the target value in real time. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above or prior art, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a method for deoxygenating a cooling system that can overcome the problems and defects of existing technologies, such as long deoxygenation time, high labor costs, and inability to maintain the dissolved oxygen content in the system below the target value in real time.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a deoxygenation device for a cooling system, comprising a purge gas system, a vacuum system, a circulating water system, and a control device;

[0008] The purge gas system is connected to the air inlet of the deoxygenated membrane module, the vacuum system is connected to the air outlet of the deoxygenated membrane module, and the deoxygenated membrane module in the circulating water system is connected through the liquid side interface.

[0009] The purge gas system includes a nitrogen cylinder and a solenoid valve connected in sequence via pipelines, used to provide the purge gas required for deoxygenation of the deoxygenation membrane module;

[0010] The vacuum system includes a water ring vacuum pump, a gas-liquid separator, and a plate heat exchanger connected in sequence by pipes, which are used to provide the vacuum required for deoxygenation of the deoxygenation membrane module.

[0011] The circulating water system includes a first electrically operated two-way valve and a deoxygenation membrane assembly connected in sequence by pipes, which are used to provide the deoxygenated medium to the deoxygenation device;

[0012] The control device is used to control the purging gas system, vacuum system, and circulating water system, and to achieve automatic deoxygenation of the converter valve cooling system.

[0013] As a preferred embodiment of the deoxygenation device of the cooling system of the present invention, the vacuum system provides cooling water to the vacuum system by means of a bypass water pipeline that sequentially connects the second electric two-way valve and the plate heat exchanger.

[0014] The vacuum system includes an axial fan on the gas-liquid separator, an external cold water pipeline through a third electric two-way valve, and a first temperature sensor to monitor the working fluid temperature of the water ring vacuum pump and to control the opening and closing of the second electric two-way valve, the third electric two-way valve, and the axial fan by feeding the results back to the control device.

[0015] The vacuum system also includes a level switch for monitoring the liquid level inside the gas-liquid separator and feeding the result back to the control device.

[0016] As a preferred embodiment of the deoxygenation device of the cooling system of the present invention, the circulating water system includes a first flow meter, a first pressure gauge and a second pressure gauge installed on the circulating water system.

[0017] The first flow meter is used to monitor the water flow rate entering the deoxygenation membrane module, and the first and second pressure gauges are used to monitor the inlet water pressure and the pressure difference between the inlet and outlet of the deoxygenation membrane module.

[0018] The purge gas system includes a pressure reducing valve, a needle valve, and a second flow meter; the pressure reducing valve is used to reduce the pressure of the high-pressure purge gas in the nitrogen cylinder to the pressure required by the deoxygenation membrane assembly, and the needle valve and the second flow meter are used to regulate and monitor the purge gas flow rate;

[0019] The vacuum system includes a check valve installed on the suction line of the water ring vacuum pump. The check valve is used to prevent liquid in the vacuum pump from flowing back into the deoxygenation membrane assembly.

[0020] As a preferred embodiment of the deoxygenation device of the cooling system of the present invention, the device includes: a dissolved oxygen detector, a second temperature sensor, and a pressure sensor, which are respectively connected to the control device.

[0021] The dissolved oxygen detector and the second temperature sensor are installed on the circulating water system on the inlet side of the deoxygenation membrane module to monitor the dissolved oxygen content of the converter valve cooling system and the water temperature entering the deoxygenation membrane module. The pressure sensor is installed on the suction line of the water ring vacuum pump to monitor the vacuum level provided by the vacuum system.

[0022] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for deoxygenating a cooling system, comprising a deoxygenation device for a cooling system; and,

[0023] The control device controls the first electric two-way valve to make the circulating water of the converter valve cooling system flow through the deoxygenation membrane assembly;

[0024] Under the control of the control device, the water ring vacuum pump generates a vacuum inside the deoxygenation membrane assembly. Dissolved oxygen in the circulating water of the converter valve cooling system is released into the deoxygenation membrane assembly under the negative pressure.

[0025] Under the control of the control device, the solenoid valve allows the depressurized purge gas to flow into the deoxygenation membrane assembly, purging out the oxygen in it;

[0026] This includes online deoxygenation methods and offline deoxygenation methods;

[0027] The online deoxygenation method includes four operating modes: first deoxygenation mode, second deoxygenation mode, third deoxygenation mode, and bypass mode.

[0028] As a preferred embodiment of the deoxygenation method of the cooling system of the present invention, the online deoxygenation method includes a dissolved oxygen detector and a second temperature sensor installed on the circulating water system at the front end of the deoxygenation membrane component, for monitoring the dissolved oxygen content of the converter valve cooling system and the water temperature entering the deoxygenation membrane component, and feeding the results back to the control device.

[0029] The liquid level switch installed on the gas-liquid separator monitors the liquid level inside the gas-liquid separator and feeds the result back to the control device.

[0030] A pressure sensor installed on the suction line of the water ring vacuum pump is used to monitor the vacuum level provided by the water ring vacuum pump and feed the result back to the control device.

[0031] The first temperature sensor, installed on the replenishment line of the water ring vacuum pump, is used to monitor the temperature of the working fluid of the water ring vacuum pump and feed the result back to the control device.

[0032] The online deoxygenation method also includes a control device that controls the opening and closing of the second electric two-way valve, the third electric two-way valve, and the axial flow fan by comparing the feedback values ​​of the dissolved oxygen detector, the second temperature sensor, and the first temperature sensor with the set values, so as to meet the normal working conditions of the deoxygenation device.

[0033] In a preferred embodiment of the deoxygenation method for the cooling system of the present invention, in the first deoxygenation mode, the feedback value of the dissolved oxygen detector is higher than the set value, and the feedback value of the second temperature sensor is lower than the feedback value of the first temperature sensor.

[0034] In the first deoxygenation mode, the first and second electric two-way valves are opened, the third electric two-way valve and the axial fan are closed, and the water ring vacuum pump and the solenoid valve are opened. The working fluid of the water ring vacuum pump is cooled down by the cooling water of the converter valve.

[0035] As a preferred embodiment of the deoxygenation method of the cooling system of the present invention, in the second deoxygenation mode, the feedback value of the dissolved oxygen detector is higher than the set value, and the feedback value of the second temperature sensor is close to the feedback value of the first temperature sensor.

[0036] In the second deoxygenation mode, the first and second electric two-way valves are opened, the third electric two-way valve is closed, the axial fan is turned on, and the water ring vacuum pump and solenoid valve are turned on. The working fluid of the water ring vacuum pump is cooled down by the cooling water of the converter valve and the axial fan.

[0037] As a preferred embodiment of the deoxygenation method of the cooling system of the present invention, in the third deoxygenation mode, the feedback value of the dissolved oxygen detector is higher than the set value, the feedback value of the second temperature sensor is higher than the feedback value of the first temperature sensor, and lower than the set value of the inlet water temperature of the deoxygenation membrane component.

[0038] In the third deoxygenation mode, the first electric two-way valve is open, the second electric two-way valve is closed, the third electric two-way valve is open, the axial fan is closed, and the water ring vacuum pump and solenoid valve are open. External cold water is used to mix and cool the working fluid of the water ring vacuum pump.

[0039] As a preferred embodiment of the deoxygenation method of the cooling system of the present invention, in the bypass mode, the feedback value of the dissolved oxygen detector is lower than the set value, or the feedback value of the second temperature sensor is higher than the set value of the inlet water temperature of the deoxygenation membrane component.

[0040] In bypass mode, the first electric two-way valve is closed, the second electric two-way valve is open, the third electric two-way valve is closed, the axial fan is turned off, the water ring vacuum pump and solenoid valve are closed, and the converter valve cooling system continues to run, but deoxygenation of it is stopped.

[0041] In the offline deoxygenation method, the first electric two-way valve is opened, the second electric two-way valve is closed, and the solenoid valve, water ring vacuum pump, third electric two-way valve, and axial flow fan are turned on. All the water in the cooling system flows through the deoxygenation membrane assembly. The deoxygenation device reduces the dissolved oxygen in the cooling system to below the target value in a short time. Subsequently, the deoxygenation device can be turned off or removed, and the converter valve cooling system is in closed circulation, maintaining the dissolved oxygen content below the target value.

[0042] The beneficial effects of this invention are as follows: By setting up a deoxygenation device and method, automatic deoxygenation can be achieved during the operation of the converter valve cooling system, maintaining the dissolved oxygen content in the cooling system below the target value in real time, thus ensuring the safe and stable operation of the converter valve cooling system; it can be used online or offline. Compared with traditional deoxygenation methods, the online mode saves the manual work of replacing resin during the commissioning phase and aeration deoxygenation during the operation phase, significantly improving the automation and intelligence level of the converter valve cooling system; compared with traditional deoxygenation methods, the offline mode greatly shortens the deoxygenation time, and the manual operation is simple and easy; it solves the problem that the deoxygenation membrane component cannot work properly due to the high water temperature during the operation of the converter valve cooling system, improving the water temperature applicability of the deoxygenation device. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0044] Figure 1 This is a schematic diagram of the deoxygenation device for the cooling system.

[0045] In the diagram: 101, Solenoid valve; 102, Water ring vacuum pump; 103, First electric two-way valve; 104, Second electric two-way valve; 105, Third electric two-way valve; 106, Axial flow fan; 201, Pressure reducing valve; 202, Needle valve; 203, Second flow meter; 204, Pressure sensor; 205, Check valve; 206, First temperature sensor; 207, Liquid level switch; 301, Dissolved oxygen detector; 302, Second temperature sensor; 303, First flow meter; 304, First pressure gauge; 305, Second pressure gauge; 401, Deoxygenation membrane assembly; 402, Nitrogen cylinder; 403, Gas-liquid separator; 404, Plate heat exchanger; 500, Control device. Detailed Implementation

[0046] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0048] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0049] Example 1

[0050] Reference Figure 1 This is the first embodiment of the present invention, which provides a deoxygenation device for a cooling system, which includes a purge gas system, a vacuum system, a circulating water system and a control device 500.

[0051] Specifically, the purge gas system, vacuum system, circulating water system, and control device number 500;

[0052] The purge gas system is connected to the air inlet of the deoxygenated membrane assembly 401, the vacuum system is connected to the air outlet of the deoxygenated membrane assembly 401, and the deoxygenated membrane assembly 401 in the circulating water system is connected through the liquid-side interface.

[0053] The purge gas system includes a nitrogen cylinder 402 and a solenoid valve 101 connected in sequence by pipelines, which are used to provide the purge gas required for deoxygenation to the deoxygenation membrane assembly 401;

[0054] The vacuum system includes a water ring vacuum pump 102, a gas-liquid separator 403, and a plate heat exchanger 404 connected in sequence by pipes, which are used to provide the vacuum required for deoxygenation of the deoxygenation membrane assembly 401.

[0055] The circulating water system includes: a first electric two-way valve 103 and a deoxygenation membrane assembly 401 connected in sequence by pipelines, which are used to provide the deoxygenated medium to the deoxygenation device;

[0056] The control device 500 is used to control the purging gas system, vacuum system, and circulating water system, and to realize automatic deoxygenation of the converter valve cooling system.

[0057] Preferably, the vacuum system is equipped with a bypass water line and multiple cooling mechanisms, including a plate heat exchanger 404, an axial fan 106, and an external chilled water line. This design not only ensures the stable operation of the water ring vacuum pump 102, but also achieves efficient energy utilization through an intelligent temperature control system including a first temperature sensor 206 and a control device 500.

[0058] The first flow meter 303, the first pressure gauge 304, and the second pressure gauge 305 in the circulating water system form a precise monitoring network to monitor the system's operating status in real time. The pressure reducing valve 201, the needle valve 202, and the second flow meter 203 in the purge gas system ensure precise control of the purge gas and optimize the efficiency of nitrogen usage.

[0059] Furthermore, the vacuum system uses a bypass water pipeline that connects the second electric two-way valve 104 and the plate heat exchanger 404 in sequence to provide cooling water for the vacuum system.

[0060] The vacuum system includes an axial fan 106 on the gas-liquid separator 403, an external cold water pipeline through the third electric two-way valve 105, and a first temperature sensor 206 for monitoring the working fluid temperature of the water ring vacuum pump 102 and controlling the opening and closing of the second electric two-way valve 104, the third electric two-way valve 105, and the axial fan 106 by feeding the results back to the control device 500.

[0061] A level switch 207 is used to monitor the liquid level inside the gas-liquid separator 403 and feeds the result back to the control device 500.

[0062] Preferably, the core component, the deoxygenation membrane assembly 401, is the key to this invention. It utilizes the principle of selective permeation to effectively remove dissolved oxygen from the cooling water. The purge gas system provides high-purity nitrogen for the deoxygenation process, while the vacuum system creates the necessary pressure gradient to promote rapid oxygen removal. This dual-action mechanism significantly improves deoxygenation efficiency.

[0063] Furthermore, the circulating water system includes a first flow meter 303, a first pressure gauge 304, and a second pressure gauge 305 installed on the circulating water system;

[0064] The first flow meter 303 is used to monitor the water flow rate entering the deoxygenation membrane module 401; the first pressure gauge 304 and the second pressure gauge 305 are used to monitor the inlet water pressure and the inlet-outlet water pressure difference of the deoxygenation membrane module 401.

[0065] The purge gas system includes a pressure reducing valve 201, a needle valve 202, and a second flow meter 203; the pressure reducing valve 201 is used to reduce the pressure of the high-pressure purge gas in the nitrogen cylinder 402 to the pressure required by the deoxygenation membrane assembly 401; the needle valve 202 and the second flow meter 203 are used to regulate and monitor the purge gas flow rate.

[0066] The vacuum system includes a check valve 205 installed on the suction line of the water ring vacuum pump 102. The check valve 205 is used to prevent liquid in the vacuum pump from flowing back into the deoxygenation membrane assembly 401.

[0067] Furthermore, it includes a dissolved oxygen detector 301, a second temperature sensor 302, and a pressure sensor 204, which are respectively connected to the control device 500;

[0068] The dissolved oxygen detector 301 and the second temperature sensor 302 are installed on the circulating water system on the inlet side of the deoxygenation membrane assembly 401 to monitor the dissolved oxygen content of the converter valve cooling system and the water temperature entering the deoxygenation membrane assembly 401; the pressure sensor 204 is installed on the suction line of the water ring vacuum pump 102 to monitor the vacuum degree provided by the vacuum system.

[0069] It should be noted that when the liquid level in the gas-liquid separator 403 is lower than the position of the liquid level switch 207, the control device 500 replenishes the gas-liquid separator 403 by opening the third electric two-way valve 105.

[0070] During operation, the control unit 500 plays a central role, coordinating and adjusting the operating parameters of the purge air system, vacuum system, and circulating water system based on feedback from various sensors. For example, when dissolved oxygen levels are detected to be excessive, the deoxygenation mode is activated; when the water temperature is abnormal, the operating status of the cooling system is adjusted. This intelligent operating mode not only improves deoxygenation efficiency but also optimizes energy utilization.

[0071] In summary, this invention achieves efficient automatic deoxygenation of the ultra-high voltage DC converter valve cooling system by innovatively integrating the collaborative work of multiple systems.

[0072] Example 2

[0073] This is a second embodiment of the present invention, which provides a method for deoxygenating a cooling system, comprising:

[0074] Specifically, the control device 500 controls the first electric two-way valve 103 to make the circulating water of the converter valve cooling system flow through the deoxygenation membrane assembly 401;

[0075] Under the control of the control device 500, the water ring vacuum pump 102 generates a vacuum inside the deoxygenation membrane assembly 401. Dissolved oxygen in the circulating water of the converter valve cooling system is released into the deoxygenation membrane assembly 401 under the action of negative pressure.

[0076] Under the control of the control device 500, the solenoid valve 101 allows the depressurized purge gas to flow into the deoxygenation membrane assembly 401, purging out the oxygen in it;

[0077] This includes online deoxygenation methods and offline deoxygenation methods;

[0078] The online deoxygenation method includes four operating modes: first deoxygenation mode, second deoxygenation mode, third deoxygenation mode, and bypass mode.

[0079] Preferably, the deoxygenation method is divided into online deoxygenation method and offline deoxygenation method. The online deoxygenation method includes four operating modes: first deoxygenation mode, second deoxygenation mode, third deoxygenation mode, and bypass mode.

[0080] Under the monitoring and control of the control device 500, when the feedback value of the dissolved oxygen detector 301 is higher than the set value and the feedback value of the second temperature sensor 302 is close to the feedback value of the first temperature sensor 206, the device switches to the second deoxygenation mode. In the second deoxygenation mode, the first electric two-way valve 103 and the second electric two-way valve 104 are opened, the third electric two-way valve 105 is closed, the axial flow fan 106 is turned on, the water ring vacuum pump 102 and the solenoid valve 101 are turned on, and the working fluid of the water ring vacuum pump 102 is cooled down by the cooling water of the converter valve and the axial flow fan 106.

[0081] Under the monitoring and control of the control device 500, when the feedback value of the dissolved oxygen detector 301 is higher than the set value, the feedback value of the second temperature sensor 302 is higher than the feedback value of the first temperature sensor 206, and lower than the set value of the inlet water temperature of the deoxygenation membrane assembly 401, the device switches to the third deoxygenation mode. In the third deoxygenation mode, the first electric two-way valve 103 is opened, the second electric two-way valve 104 is closed, the third electric two-way valve 105 is opened, the axial flow fan 106 is closed, and the water ring vacuum pump 102 and the solenoid valve 101 are opened. External cold water is used to mix and cool the working fluid of the water ring vacuum pump 102.

[0082] Furthermore, the online deoxygenation method includes: a dissolved oxygen detector 301 and a second temperature sensor 302 installed on the circulating water system at the front end of the deoxygenation membrane assembly 401, which are used to monitor the dissolved oxygen content of the converter valve cooling system and the water temperature entering the deoxygenation membrane assembly 401, and feed the results back to the control device 500.

[0083] The liquid level switch 207 installed on the gas-liquid separator monitors the liquid level in the gas-liquid separator 403 and feeds the result back to the control device 500.

[0084] A pressure sensor installed on the suction line of the water ring vacuum pump 102 is used to monitor the vacuum provided by the water ring vacuum pump 102 and feed the result back to the control device 500.

[0085] A first temperature sensor 206 is installed on the replenishment pipeline of the water ring vacuum pump 102 to monitor the temperature of the working fluid of the water ring vacuum pump 102 and feed the result back to the control device 500.

[0086] The online deoxygenation method also includes: the control device 500 controls the opening and closing of the second electric two-way valve 104, the third electric two-way valve 105, and the axial flow fan 106 by comparing the feedback values ​​of the dissolved oxygen detector 301, the second temperature sensor 302, and the first temperature sensor 206 with the set values, so as to meet the normal working conditions of the deoxygenation device.

[0087] Preferably, under the monitoring and control of the control device 500, when the feedback value of the dissolved oxygen detector 301 is lower than the set value, or the feedback value of the second temperature sensor 302 is higher than the set value of the inlet water temperature of the deoxygenation membrane assembly 401, the device switches to bypass mode. In bypass mode, the first electric two-way valve 103 is closed, the second electric two-way valve 104 is open, the third electric two-way valve 105 is closed, the axial flow fan 106 is closed, the water ring vacuum pump 102 and the solenoid valve 101 are closed, and the converter valve cooling system continues to operate, but stops deoxygenating it.

[0088] Furthermore, in the first deoxygenation mode, the feedback value of the dissolved oxygen detector 301 is higher than the set value, and the feedback value of the second temperature sensor 302 is lower than the feedback value of the first temperature sensor 206.

[0089] In the first deoxygenation mode, the first electric two-way valve 103 and the second electric two-way valve 104 are opened, the third electric two-way valve 105 and the axial fan 106 are closed, the water ring vacuum pump 102 and the solenoid valve 101 are opened, and the working fluid of the water ring vacuum pump 102 is cooled down by the cooling water of the converter valve.

[0090] Furthermore, in the second deoxygenation mode, the feedback value of the dissolved oxygen detector 301 is higher than the set value, and the feedback value of the second temperature sensor 302 is close to the feedback value of the first temperature sensor 206.

[0091] In the second deoxygenation mode, the first electric two-way valve 103 and the second electric two-way valve 104 are opened, the third electric two-way valve 105 is closed, the axial fan 106 is turned on, the water ring vacuum pump 102 and the solenoid valve 101 are turned on, and the working fluid of the water ring vacuum pump 102 is cooled down by the cooling water of the converter valve and the axial fan 106.

[0092] Furthermore, in the third deoxygenation mode, the feedback value of the dissolved oxygen detector 301 is higher than the set value, the feedback value of the second temperature sensor 302 is higher than the feedback value of the first temperature sensor 206, and lower than the set value of the inlet water temperature of the deoxygenation membrane assembly 401.

[0093] In the third deoxygenation mode, the first electric two-way valve 103 is opened, the second electric two-way valve 104 is closed, the third electric two-way valve 105 is opened, the axial fan 106 is closed, and the water ring vacuum pump 102 and the solenoid valve 101 are opened. External cold water is used to mix and cool the working fluid of the water ring vacuum pump 102.

[0094] Furthermore, in bypass mode, the feedback value of dissolved oxygen detector 301 is lower than the set value, or the feedback value of second temperature sensor 302 is higher than the set value of inlet water temperature of deoxygenation membrane assembly 401.

[0095] In bypass mode, the first electric two-way valve 103 is closed, the second electric two-way valve 104 is open, the third electric two-way valve 105 is closed, the axial fan 106 is closed, the water ring vacuum pump 102 and the solenoid valve 101 are closed, and the converter valve cooling system continues to operate, but deoxygenation of it is stopped.

[0096] In the offline deoxygenation method, the first electric two-way valve 103 is opened, the second electric two-way valve 104 is closed, and the solenoid valve 101, water ring vacuum pump 102, third electric two-way valve 105, and axial fan 106 are opened. All the water in the cooling system flows through the deoxygenation membrane assembly 401. The deoxygenation device reduces the dissolved oxygen in the cooling system to below the target value in a short time. Subsequently, the deoxygenation device can be turned off or removed, and the converter valve cooling system is in closed circulation, maintaining the dissolved oxygen content below the target value.

[0097] In summary, this invention, by setting a deoxygenation method, can achieve automatic deoxygenation during the operation of the converter valve cooling system, maintaining the dissolved oxygen content in the cooling system below the target value in real time, thus ensuring the safe and stable operation of the converter valve cooling system. It can be used online or offline. In online mode, compared to traditional deoxygenation methods, it saves manpower for resin replacement during commissioning and aeration deoxygenation during operation, significantly improving the automation and intelligence level of the converter valve cooling system. In offline mode, compared to traditional deoxygenation methods, it greatly shortens the deoxygenation time and is simple and easy to operate manually. It also solves the problem of high water temperature during the operation of the converter valve cooling system causing the deoxygenation membrane component to malfunction, improving the water temperature applicability of the deoxygenation device.

[0098] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0099] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0100] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0101] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for deoxygenating a cooling system, characterized in that: Including a deoxygenation device for a converter valve cooling system; The deoxygenation device of the converter valve cooling system includes a purge gas system, a vacuum system, a circulating water system, and a control device (500). The circulating water system includes a first electric two-way valve (103) and a deoxygenation membrane assembly (401) connected in sequence by pipes, used to provide the deoxygenated medium to the deoxygenation device; it also includes a dissolved oxygen detector (301) and a second temperature sensor (302) connected to the control device (500); the dissolved oxygen detector (301) and the second temperature sensor (302) are installed on the circulating water system on the inlet side of the deoxygenation membrane assembly (401), used to monitor the dissolved oxygen content of the converter valve cooling system and the water temperature entering the deoxygenation membrane assembly (401), and to feed the results back to the control device (500). The purge gas system is connected to the air inlet of the deoxygenated membrane assembly (401), and the vacuum system is connected to the air outlet of the deoxygenated membrane assembly (401). The purge gas system includes a nitrogen cylinder (402) and a solenoid valve (101) connected in sequence by pipelines, and is used to provide the purge gas required for deoxygenation to the deoxygenation membrane assembly (401); The vacuum system includes a water ring vacuum pump (102), a gas-liquid separator (403), and a plate heat exchanger (404) connected in sequence by pipes, which are used to provide the vacuum required for deoxygenation of the deoxygenation membrane assembly (401); The vacuum system also includes an axial fan (106) on the gas-liquid separator (403), an external cold water pipeline connected to the gas-liquid separator (403) via a third electric two-way valve (105), and a bypass water pipeline that connects the second electric two-way valve (104) and the plate heat exchanger (404) in sequence via pipelines; the external cold water pipeline is used to provide external cold water to the vacuum system, and the bypass water pipeline is used to provide circulating water for the converter valve cooling system of the vacuum system; The vacuum system also includes a first temperature sensor (206) for monitoring the working fluid temperature of the water ring vacuum pump (102) and feeding the result back to the control device (500). The control device (500) is used to control the opening and closing of the second electric two-way valve (104), the third electric two-way valve (105), and the axial fan (106). The vacuum system also includes a level switch (207) installed on the gas-liquid separator (403) for monitoring the liquid level in the gas-liquid separator (403) and feeding the result back to the control device (500). The vacuum system also includes a check valve (205) installed on the suction line of the water ring vacuum pump (102), the check valve (205) being used to prevent liquid in the vacuum pump from flowing back into the deoxygenation membrane assembly (401); The vacuum system also includes a pressure sensor (204) connected to the control device (500); the pressure sensor (204) is installed on the suction line of the water ring vacuum pump (102) to monitor the vacuum level provided by the vacuum system and to feed the result back to the control device (500). The deoxygenation method based on the deoxygenation device of the aforementioned converter valve cooling system includes: The control device (500) controls the first electric two-way valve (103) to make the circulating water of the converter valve cooling system flow through the deoxygenation membrane assembly (401). Under the control of the control device (500), the water ring vacuum pump (102) generates a vacuum inside the deoxygenation membrane assembly (401), and the dissolved oxygen in the circulating water of the converter valve cooling system is released into the deoxygenation membrane assembly (401) under the action of negative pressure. Under the control of the control device (500), the solenoid valve (101) allows the depressurized purge gas to flow into the deoxygenation membrane assembly (401), and purges out the oxygen therein; The deoxygenation methods specifically include online deoxygenation methods and offline deoxygenation methods; The online deoxygenation method includes: a first deoxygenation mode that uses circulating water from the converter valve cooling system to cool the working fluid of the water ring vacuum pump (102); a second deoxygenation mode that uses circulating water from the converter valve cooling system and an axial fan (106) to cool the working fluid of the water ring vacuum pump (102); a third deoxygenation mode that uses external cold water to cool the working fluid of the water ring vacuum pump (102); and a bypass mode.

2. The deoxygenation method for a cooling system as described in claim 1, characterized in that: In the first deoxygenation mode, the feedback value of the dissolved oxygen detector (301) is higher than the set value, and the feedback value of the second temperature sensor (302) is lower than the feedback value of the first temperature sensor (206). In the first deoxygenation mode, the first electric two-way valve (103) and the second electric two-way valve (104) are open, the third electric two-way valve (105) and the axial fan (106) are closed, and the water ring vacuum pump (102) and the solenoid valve (101) are open.

3. The deoxygenation method for a cooling system as described in claim 2, characterized in that: In the second deoxygenation mode, the feedback value of the dissolved oxygen detector (301) is higher than the set value, and the feedback value of the second temperature sensor (302) is close to the feedback value of the first temperature sensor (206). In the second deoxygenation mode, the first electric two-way valve (103) and the second electric two-way valve (104) are opened, the third electric two-way valve (105) is closed, the axial fan (106) is turned on, and the water ring vacuum pump (102) and the solenoid valve (101) are turned on.

4. The deoxygenation method for a cooling system as described in claim 3, characterized in that: In the third deoxygenation mode, the feedback value of the dissolved oxygen detector (301) is higher than the set value, the feedback value of the second temperature sensor (302) is higher than the feedback value of the first temperature sensor (206), and lower than the set value of the inlet water temperature of the deoxygenation membrane assembly (401). In the third deoxygenation mode, the first electric two-way valve (103) is open, the second electric two-way valve (104) is closed, the third electric two-way valve (105) is open, the axial fan (106) is closed, and the water ring vacuum pump (102) and the solenoid valve (101) are open.

5. The deoxygenation method for a cooling system as described in claim 4, characterized in that: In the bypass mode, the feedback value of the dissolved oxygen detector (301) is lower than the set value, or the feedback value of the second temperature sensor (302) is higher than the set value of the inlet water temperature of the deoxygenation membrane assembly (401). In the bypass mode, the first electric two-way valve (103) is closed, the second electric two-way valve (104) is open, the third electric two-way valve (105) is closed, the axial fan (106) is closed, the water ring vacuum pump (102) and the solenoid valve (101) are closed, and the converter valve cooling system continues to operate, but deoxygenation of it is stopped. In the offline deoxygenation method, the first electric two-way valve (103) is opened, the second electric two-way valve (104) is closed, and the solenoid valve (101), water ring vacuum pump (102), third electric two-way valve (105), and axial flow fan (106) are turned on. All the water in the converter valve cooling system flows through the deoxygenation membrane assembly (401). The deoxygenation device reduces the dissolved oxygen in the converter valve cooling system to below the target value in a short time. Then the deoxygenation device is turned off or removed, and the converter valve cooling system is in closed circulation, maintaining the dissolved oxygen content below the target value.

6. The deoxygenation method for a cooling system as described in claim 5, characterized in that: The circulating water system also includes a first flow meter (303), a first pressure gauge (304), and a second pressure gauge (305) installed on the circulating water system. The first flow meter (303) is used to monitor the water flow rate entering the deoxygenation membrane module (401), and the first pressure gauge (304) and the second pressure gauge (305) are used to monitor the inlet water pressure and the inlet and outlet water pressure difference of the deoxygenation membrane module (401), respectively. The purge gas system includes a pressure reducing valve (201), a needle valve (202), and a second flow meter (203); the pressure reducing valve (201) is used to reduce the pressure of the high-pressure purge gas in the nitrogen cylinder (402) to the pressure required by the deoxygenation membrane assembly (401); the needle valve (202) is used to adjust the purge gas flow rate; and the second flow meter (203) is used to monitor the purge gas flow rate.

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