Drainage control method and device, terminal equipment and storage medium

Abstract

The invention is applicable to the technical field of nuclear power stations, and provides a drainage control method and device, terminal equipment and a storage medium, and the method comprises the following steps: starting a target water pump after loop circulation of a secondary loop system is established; the opening degree of the water outlet valve of the target water pump is adjusted according to the water temperature change condition of the secondary loop system, water of loop circulation of the secondary loop system can be controlled to be drained in advance under the condition that the cooling rate is not affected after loop circulation of the secondary loop system is established, the drainage rate can be adjusted according to the cooling efficiency, and the cooling efficiency of the secondary loop system is improved. Water is drained in advance under the condition that water circulation cooling of the secondary circuit system is guaranteed, so that water of the secondary circuit system can be emptied more quickly, the time required by water drainage of the secondary circuit system of an overhaul unit can be greatly shortened, the influence of water drainage of the secondary circuit system on an overhaul path is reduced, and the overhaul efficiency is improved.

Description

Technical Field

[0001] This application belongs to the technical field of nuclear power plants, and particularly relates to a drainage control method, device, terminal device, and storage medium. Background Technique

[0002] The energy conversion of a nuclear power plant can be achieved with the aid of three loops. The reactor coolant enters the reactor driven by the main pump, flows through the reactor core, then flows out from the outlet pipe of the reactor vessel, enters the steam generator, and then returns to the main pump. This is the circulation loop of the reactor coolant (referred to as the primary loop). During the circulation process, the reactor coolant takes away the energy generated by the nuclear fission reaction from the reactor core, and in the steam generator, under the condition of physical isolation, transfers the energy to the water in the secondary loop system, causing the water in the secondary loop system to be heated, generate steam, and then drive the steam turbine to drive the generator coaxial with the steam turbine to generate electricity. The exhausted steam after doing work is condensed into water by cooling water such as seawater, river water, and lake water (the water in the tertiary loop) in the condenser, and then replenished to the steam generator. The role of the tertiary loop with media such as seawater is to condense the exhausted steam into water and at the same time take away the waste heat of the nuclear power plant.

[0003] Among them, the secondary loop system is also called the feedwater heating system, which is a closed steam-water circulation loop. Its main function is to introduce high-temperature and high-pressure steam into the steam turbine to do work and then condense it, and then gradually heat the condensed water and send it to the secondary side of the steam generator to generate steam, and maintain the continuous operation of this steam-water cycle.

[0004] Regular overhauls are necessary means to improve the operation safety of nuclear power plants. During each overhaul, the overhauled unit will be inspected, and isolation, inspection, etc. can only be carried out after the circulating water in the secondary loop system is emptied.

[0005] Currently, it takes a long time to empty the water in the secondary loop system. The drainage method of the secondary loop system will affect the subsequent isolation and inspection work, and thus affect the overhaul path. Summary of the Invention

[0006] The embodiments of this application provide a drainage control method, device, terminal device, and storage medium, which can shorten the time required for draining the water in the secondary loop system of the overhauled unit, reduce the impact of the drainage of the secondary loop system on the overhaul path, and improve the overhaul efficiency.

[0007] In a first aspect, the embodiments of this application provide a drainage control method, including:

[0008] After the loop circulation of the secondary loop system is established, start the target water pump;

[0009] Adjust the opening degree of the outlet valve of the target water pump according to the water temperature change of the secondary loop system to control the cooling efficiency of the secondary loop system, where the target water pump is used to discharge the water of the secondary loop system to the waste liquid collection sump of the conventional island.

[0010] In one implementation of the first aspect, the secondary loop system includes a deaerator and a high-pressure heater. Adjusting the opening degree of the outlet valve of the target water pump according to the water temperature change of the secondary loop system includes:

[0011] If the water temperature of the deaerator or the high-pressure heater exceeds the preset temperature, adjust the opening degree of the outlet valve of the target water pump according to the water temperature change rate of the secondary loop system;

[0012] If the water temperature of the deaerator or the high-pressure heater does not exceed the preset temperature, reduce the opening degree of the condensate flow regulating valve and increase the opening degree of the outlet valve of the target water pump to more than the first preset opening degree.

[0013] In one implementation of the first aspect, the step of adjusting the opening degree of the outlet valve of the target water pump according to the water temperature change rate if the water temperature of the deaerator or the high-pressure heater exceeds the preset temperature includes:

[0014] When the temperature change rate is less than the preset change rate, reduce the opening degree of the outlet valve of the target water pump;

[0015] When the temperature change rate is greater than or equal to the preset change rate, increase the opening degree of the outlet valve of the target water pump.

[0016] In one implementation of the first aspect, the step of reducing the opening degree of the condensate flow regulating valve and gradually increasing the opening degree of the outlet valve of the target water pump to more than the preset opening degree if the water temperature of the deaerator or the high-pressure heater does not exceed the preset temperature includes:

[0017] Reduce the opening degree of the condensate flow regulating valve by a second preset opening degree based on the required opening degree to reduce the liquid level of the deaerator;

[0018] Adjust the opening degree of the outlet valve of the target water pump to more than the first preset opening degree step by step according to the preset opening degree adjustment step.

[0019] In one implementation of the first aspect, the waste liquid collection sump of the conventional island is connected to the standby pool through a temporary water pump, and the method further includes:

[0020] When the water level of the target water receiving tank exceeds the preset water level, start the temporary water pump, and the temporary water pump is used to discharge the water in the waste liquid collection sump of the conventional island to the standby pool.

[0021] In an implementation of the first aspect, when the water level in the target water receiving tank exceeds the preset water level, starting the temporary water pump includes:

[0022] Determining a start-up strategy for the temporary water pump according to the drainage volume of the secondary loop system and the water receiving capacity of the standby pool;

[0023] Starting the temporary water pump according to the start-up strategy of the temporary water pump.

[0024] In an implementation of the first aspect, the standby pool includes a neutralization tank of the first condensate polishing system and a neutralization tank of the second condensate polishing system. The temporary water pump includes a first temporary water pump and a second temporary water pump. The first temporary water pump is connected to the neutralization tank of the first condensate polishing system and the waste liquid collection sump pit of the conventional island. The second temporary water pump is connected to the neutralization tank of the second condensate polishing system and the waste liquid collection sump pit of the conventional island. When the water level in the target water receiving tank exceeds the preset water level, starting the temporary water pump includes:

[0025] When the water level in the target water receiving tank is higher than the preset water level, reducing the opening degree of the outlet valve of the target water pump and starting the first temporary water pump to discharge the water in the waste liquid collection sump pit of the conventional island to the neutralization tank of the first condensate polishing system;

[0026] After the target water receiving tank is full, starting the second temporary water pump to discharge the water in the waste liquid collection sump pit of the conventional island to the neutralization tank of the second condensate polishing system.

[0027] In a second aspect, an embodiment of the present application provides a drainage control device, including:

[0028] A start-up unit for starting a target water pump after the loop circulation of the secondary loop system is established;

[0029] An adjustment unit for adjusting the opening degree of the outlet valve of the target water pump according to the temperature change of the secondary loop system to control the cooling efficiency of the secondary loop system, where the target water pump is used to discharge the water of the secondary loop system to the waste liquid collection sump pit of the conventional island.

[0030] In a third aspect, an embodiment of the present application provides a terminal device. The above terminal device includes a processor, a memory, and a computer program stored in the above memory and executable on the above processor. When the above processor executes the above computer program, the method as described in the first aspect or any optional manner of the first aspect is implemented.

[0031] Fourthly, an embodiment of the present application provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described above in the first aspect or any optional manner of the first aspect is implemented.

[0032] Fifthly, an embodiment of the present application provides a computer program product. When the computer program product runs on a terminal device, the terminal device is enabled to execute the method described above in the first aspect or any optional manner of the first aspect.

[0033] The beneficial effects of the embodiments of the present application compared with the prior art are as follows:

[0034] A drainage control method, device, terminal device and computer-readable storage medium provided by an embodiment of the present application, after the loop circulation of the secondary loop system is established, immediately starts the target water pump to drain part of the water in the loop circulation of the secondary loop system in advance, and can adjust the opening degree of the water outlet valve of the target water pump for early drainage according to the temperature change of the secondary loop system, so as to control the cooling efficiency of the secondary loop system, drain water in advance while ensuring the cooling rate of the water in the secondary loop system, so that the water in the secondary loop system can be emptied faster, and thus can greatly shorten the time required for draining the secondary loop system of the overhaul unit, reduce the impact of the secondary loop system drainage on the overhaul path, and improve the overhaul efficiency. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a schematic diagram of the architecture of a secondary loop system;

[0037] Figure 2 It is a schematic diagram of the drainage process of the secondary loop system during current overhaul;

[0038] Figure 3 It is a schematic diagram of the implementation process of a drainage control method provided by an embodiment of the present application;

[0039] Figure 4 It is a schematic diagram of the drainage process of the secondary loop system provided by an embodiment of the present application;

[0040] Figure 5 It is a schematic diagram of the implementation process of another drainage control method provided by an embodiment of the present application;

[0041] Figure 6 It is a schematic structural diagram of a secondary circuit system provided by an embodiment of the present application;

[0042] Figure 7 It is a schematic structural diagram of a drainage control device provided by an embodiment of the present application;

[0043] Figure 8 It is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

[0044] Figure 9 It is a schematic structural diagram of a computer-readable storage medium provided by an embodiment of the present application. Detailed implementation manners

[0045] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system architectures and technologies are presented to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0046] It should be understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations. Additionally, in the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0047] It should also be understood that referring to "one embodiment" or "some embodiments" etc. in the specification of the present application means that specific features, structures, or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprise", "include", "have", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0048] A nuclear power plant is a device that converts nuclear fission energy into electrical energy. The system that uses nuclear energy to generate steam is called the "nuclear steam supply system". The nuclear steam supply system heats the water in the external loop through the nuclear fission energy of nuclear fuel to generate steam, thereby realizing the energy conversion of nuclear energy - thermal energy - electrical energy.

[0049] Specifically, the energy conversion of a nuclear power plant can be achieved with the help of three loops. The reactor coolant enters the reactor driven by the main pump, flows through the reactor core, exits from the outlet pipe of the reactor vessel, enters the steam generator, and then returns to the main pump. This is the circulation loop of the reactor coolant (referred to as the primary loop). During the circulating flow, the reactor coolant takes away the energy generated by the nuclear fission reaction in the reactor core and transfers the energy to the water in the secondary loop system under the condition of physical isolation in the steam generator, causing the water in the secondary loop system to be heated, generating steam to drive the steam turbine, and driving the generator coaxial with the steam turbine to generate electricity. The spent steam after doing work is condensed into water by cooling water such as seawater, river water, and lake water (the water in the tertiary loop) in the condenser and then replenished to the steam generator. The role of the tertiary loop with media such as seawater is to condense the spent steam into water and at the same time take away the waste heat of the nuclear power plant.

[0050] Among them, the secondary loop system is also called the feedwater heating system, which is a closed steam-water circulation loop. Its main function is to introduce high-temperature and high-pressure steam into the steam turbine to do work and then condense it, and then gradually heat the condensed water and send it to the secondary side of the steam generator to generate steam, and maintain the continuous operation of this steam-water cycle.

[0051] The secondary circuit system mainly includes a condensate extraction system (CEX), a low-pressure feedwater heater system (ABP), a feedwater deaerator system (ADG), a turbine-driven feedwater pump system (APP), a motor-driven feedwater pump system (APA), a start-up feedwater system (APD), a high-pressure feedwater heater system (AHP), and a feedwater flow control system (ARE). The operating principle of the secondary circuit system can be as follows: The low-temperature water in the hot well of the condenser CEX is pumped out by a condensate pump and pressurized, and then heated to 139.88 °C by multiple low-pressure heaters (such as 4 low-pressure heaters), and then sent to the deaerator ADG. The deaerator ADG heats the condensate water to 169.8 °C and deaerates it. After that, it is pressurized by the main feedwater pumps, specifically the APA feedwater pump, the APP feedwater pump, and the APD feedwater pump, and then enters the high-pressure heater AHP for further heating to 226 °C. Finally, it enters the secondary side of the steam generator through the feedwater flow regulating valve ARE to generate steam, absorbs the heat of the reactor coolant, and then enters the steam turbine to do work.

[0052] Figure 1 The schematic architecture diagram of a secondary circuit system is shown. As Figure 1 shown, in a possible implementation, the secondary circuit system 10 may include a steam generator 101, a high-pressure cylinder 102, a steam-water separation reheater 103, a low-pressure cylinder 104, a generator 105, a condenser 106, a No. 1 low-pressure heater 107, a No. 3 low-pressure heater 108, a No. 4 low-pressure heater 109, a deaerator 1010, a No. 6 high-pressure heater 1011, and a No. 7 high-pressure heater 1012.

[0053] Under full-power operation conditions, the saturated steam (absolute pressure 6.71 MPa, temperature 283 °C) generated by the steam generator 101 is first sent through the main steam pipeline to the four high-pressure steam chambers of the steam turbine to regulate the amount of steam entering the high-pressure cylinder 102. The steam exiting the high-pressure steam chambers enters the high-pressure cylinder 102 through four annular steam pipelines to expand and do work. During the expansion process, a portion of the steam is extracted from different stages of the front and rear flow paths of the high-pressure cylinder 102 and sent to the No. 6 high-pressure heater 1011 and the No. 7 high-pressure heater 1012. The high-pressure heaters are used to heat the feed water and are sent to the moisture separator reheater 103 to heat the exhaust steam from the high-pressure cylinder 102. A portion of the exhaust steam from the high-pressure cylinder 102 (absolute pressure 0.783 MPa, temperature 169.5 °C, humidity 14.3%) is sent to the deaerator 1010, and most of it is discharged through the cold reheat pipeline to two moisture separator reheaters located on both sides of the low-pressure cylinder 104, where steam-water separation is performed, and the steam is reheated twice by the extraction steam and the new steam. The superheated steam (absolute pressure 0.747 MPa, temperature 265 °C) exiting the moisture separator reheater is sent through pipelines into the low-pressure cylinder to continue expanding and doing work. During the expansion process, a portion of the steam is extracted from the respective front and rear flow paths of the low-pressure cylinder 104 and sent to the No. 3 low-pressure heater 108 and the No. 4 low-pressure heater 109 to heat the condensate; the exhaust steam from the low-pressure cylinder 104 (absolute pressure 7.5 kPa, temperature 40.3 °C) is discharged into the condenser 106 and is cooled by seawater to become condensate. The condensate in the hot well of the condenser 106 is pumped out by the condensate pump and boosted in pressure (absolute pressure 2.4 MPa), heated to 139.88 °C by the low-pressure heaters, and sent to the deaerator. The deaerator heats and deaerates the condensate and stores a certain amount of deaerated condensate. The main feed water pump draws water from the bottom of the deaerator tank, boosts the pressure of the water (absolute pressure 8.3 MPa, temperature 169.8 °C), and further heats it (temperature 226 °C, absolute pressure 6.88 MPa) through the No. 6 high-pressure heater 1011 and the No. 7 high-pressure heater 1012, and finally enters the secondary side of the steam generator through the feed water flow regulating valve, absorbs the heat of the reactor coolant, and is converted into saturated steam, thus forming a complete thermodynamic cycle, and this complete thermodynamic cycle is the loop cycle of the secondary loop system.

[0054] Periodic overhauls are a necessary means to improve the operational safety of nuclear power plants, and the overhauled units are inspected during each overhaul. During the downward stage of the unit overhaul, due to equipment maintenance, it is necessary to first cool the water circulation of the secondary loop system to 40 °C and then evacuate after breaking the vacuum in the condenser.

[0055] Exemplarily, Figure 2 The drainage process schematic diagram of the secondary loop system during the current overhaul is shown. As Figure 2 shown, the water in the secondary loop system needs to be first cooled by water circulation, enter the condenser to break the vacuum, and then be evacuated.

[0056] In the actual application process, the drainage volume in the downward stage of the secondary circuit system is about 1500 m 3 , and according to relevant regulations, the water in the secondary circuit system needs to be discharged in a trough type, that is, the water in the secondary circuit system needs to enter the conventional island liquid waste discharge system (SEL) through the conventional island liquid waste collection system (SEK) for discharge. There are 3 water receiving tanks in the conventional island liquid waste discharge system, and each SEK water receiving tank can receive 400 m 3 . The SEL water receiving tank receives the drainage of the conventional island of two units. In addition to receiving the drainage of the secondary circuit system of the overhaul unit, it also needs to receive the drainage of the conventional unit. The drainage rate of the conventional unit is about 15 - 20 m 3 / h, and the drainage rate of the secondary circuit system of the overhaul unit is about 30 m 3 / h. It takes 9 hours for a SEL water receiving tank to be full of water until it is ready to receive water again. Among them, it takes 1 hour to switch tanks and circulate, 3 hours for the tank to circulate, 1 hour for testing, and 4 hours for discharge and restoration.

[0057] All the above reasons will cause the drainage of the overhaul unit to be blocked, resulting in the need for a long time (up to 30 hours) to empty the water at the drainage terminal, that is, the secondary circuit system. Since subsequent isolation and maintenance work need to be carried out after the water in the secondary circuit system is emptied, the current drainage method of the secondary circuit system will affect the progress of subsequent isolation and maintenance work, and thus affect the overhaul path.

[0058] Based on this, the embodiment of the present application provides a drainage control method. After the loop circulation of the secondary circuit system is established, the target water pump is immediately started to drain part of the water in the loop circulation of the secondary circuit system in advance, and the opening of the outlet valve of the target water pump for draining water in advance can be adjusted according to the temperature change of the secondary circuit system, so as to control the cooling efficiency of the secondary circuit system, drain water in advance while ensuring the cooling rate of the water in the secondary circuit system, so that the water in the secondary circuit system can be emptied faster, and thus can greatly shorten the time required for draining the secondary circuit system of the overhaul unit, reduce the impact of the secondary circuit system drainage on the overhaul path, and improve the overhaul efficiency.

[0059] The drainage control method provided by the embodiment of the present application will be described in detail below:

[0060] Please refer to Figure 3 , Figure 3 shows the implementation process of a drainage control method provided by the embodiment of the present application. As Figure 3As shown, the above drainage control method may specifically include S11 to S12.

[0061] It should be noted that the execution subject of the drainage control method provided in the embodiments of the present application may be the management and control equipment of a nuclear power plant. The above management and control equipment may be terminals such as mobile phones, desktop computers, laptop computers, and tablet computers, or devices such as cloud servers in various application scenarios. The present application does not make specific limitations in this regard. The following takes the execution subject being the management and control equipment as an example for description:

[0062] In S11, after the loop circulation of the secondary loop system is established, the target water pump is started.

[0063] In specific applications, after the loop circulation of the secondary loop system is established, the condensate received by the CEX condenser will cause the water level of the condenser to rise. In order to prevent the liquid level of the condenser from exceeding the liquid level corresponding to the high liquid level alarm, the target water pump can be started at this time to achieve the drainage of the secondary loop system.

[0064] It should be noted that since the loop circulation of the secondary loop system has just been established, the temperature of the water in the secondary loop system is above 100°C at this time, that is, the temperatures in the deaerator ADG and the high-pressure heater AHP are both above 100°C. Therefore, the above target water pump can select the condensate pump A, and the outlet valve of the target water pump can specifically be the inlet isolation valve CEX001VL of the condensate pump A. That is, after the loop circulation of the secondary loop system is established, the condensate pump is started to drain water in advance, specifically, the inlet isolation valve CEX001VL of the condensate pump A is opened.

[0065] As Figure 4 shown, for the drainage control method provided in the embodiments of the present application, after establishing the cooling circulation of the secondary loop system, the secondary loop system is started to drain water in advance, that is, the target water pump is started to drain water. After meeting the cooling requirements, the vacuum in the condenser is broken, and then the emptying is carried out.

[0066] In S12, the opening degree of the outlet valve of the target water pump is adjusted according to the water temperature change of the secondary loop system.

[0067] In specific applications, in order not to affect the cooling effect of the secondary loop system, it is necessary to adjust the opening degree of the outlet valve of the target water pump in real time according to the water temperature change of the secondary loop system, that is, under the condition of ensuring the cooling rate, part of the circulating water of the secondary loop system is drained in advance, thereby improving the drainage efficiency.

[0068] In specific applications, adjusting the opening degree of the outlet valve of the target water pump according to the water temperature change of the secondary loop system may involve monitoring the water temperature of the circulating water in the secondary loop system, and when the water temperature is relatively high, reducing the opening degree of the outlet valve of the target water pump, and when the temperature is relatively low, increasing the opening degree of the outlet valve of the target water pump. It may also involve monitoring the rate of change of the water temperature of the circulating water in the secondary loop system, and when the rate of temperature change is relatively small, reducing the opening degree of the outlet valve of the target water pump, and when the rate of temperature change is relatively large, increasing the opening degree of the outlet valve of the target water pump.

[0069] It can be understood that after reducing the opening degree of the outlet valve of the target water pump, the drainage rate will become smaller, so that the discharged water volume is relatively small, and more circulating water participates in the circulating cooling, which can better cool down. After increasing the opening degree of the outlet valve of the target water pump, the drainage rate will increase, so that the discharged water volume becomes larger, and the drainage efficiency can be improved.

[0070] It can also be understood that the water volume of the circulating water in the secondary loop system is very large. Therefore, discharging some circulating water in advance will not have too much impact on the circulating cooling effect of the secondary loop system, but can significantly improve the drainage efficiency.

[0071] Please refer to Figure 4 , Figure 4 which shows the schematic diagram of the drainage process of the secondary loop system provided by the embodiment of the present application. As Figure 4 shown, the condenser CEX uses CRF seawater for cooling. The water volume in the condenser CEX can be pumped out and boosted through the two condensate flow regulating valves CEX025VL and CEX026VL, and after passing through the low-pressure heater ABP, it is sent to the deaerator ADG for deaeration, and then after being boosted by the main feed water pump, specifically the APA feed water pump, the APP feed water pump, and the APD feed water pump, it enters the high-pressure heater AHP, and finally circulates back to the condenser CEX. Among them, after establishing the loop circulation of the secondary loop system, CEX001VL can also be started to discharge the water in the secondary loop system to the SEK drainage pit in advance.

[0072] It should be noted that the water in the deaerator ADG can be discharged to the condenser CEX through ADG005VL, and the water in the high-pressure heater AHP can be discharged to the condenser CEX through AHP007VL.

[0073] In specific applications, the water in the secondary loop system is discharged to the SEK drainage pit in advance, and then discharged from the SEK drainage pit to the SEL water receiving tank.

[0074] In an embodiment of the present application, the above S12 may specifically include:

[0075] S121: If the water temperature of the deaerator or the high-pressure heater exceeds the preset temperature, adjust the opening of the outlet valve of the target water pump according to the water temperature change rate of the secondary loop system.

[0076] In specific applications, the above preset temperature can be set according to actual application requirements, for example, set to 60°C. When the loop circulation of the secondary loop system is just established, the condenser CEX receives the drain water of the secondary loop system, which will cause the water level of the condenser to rise. Therefore, before the high-level alarm appears, the target water pump can be started to drain the water of the secondary loop system in advance. Since the cooling cycle has just started at this time, the water temperature of the deaerator ADG and the high-pressure heater AHP will be very high, that is, it will exceed the preset temperature. To ensure the cooling rate, it is necessary to adjust the opening of the outlet valve of the target water pump according to the water temperature change rate of the secondary loop system at all times. Specifically, the opening of the CEX001VL valve can be adjusted.

[0077] The above adjustment of the opening of the outlet valve of the target water pump according to the water temperature change rate of the secondary loop system can specifically be to reduce the opening of the outlet valve of the target water pump when the temperature change rate is less than the preset change rate, and increase the opening of the outlet valve of the target water pump when the temperature change rate is greater than or equal to the preset change rate.

[0078] It should be noted that the above preset change rate can be set according to actual application requirements, and this application does not make specific restrictions on this.

[0079] In specific applications, during this stage (high-temperature stage), the adjustment ratio of the opening of the CEX001VL valve can specifically be 20% - 40%, so that the water temperature of the deaerator ADG can be reduced to below 60°C within 2 hours, and the water temperature of the high-pressure heater AHP can be reduced to below 60°C after 4 hours.

[0080] S122: If the water temperature of the deaerator or the high-pressure heater does not exceed the preset temperature, reduce the opening of the condensate flow regulating valve, and increase the opening of the outlet valve of the target water pump to above the first preset opening.

[0081] In specific applications, the water temperature of the deaerator ADG and the water temperature of the high-pressure heater AHP are both less than 60°C, indicating that the water temperature of the circulating water in the secondary loop system is relatively low at this time. At this time, the opening of CEX025VL or CEX025VL can be reduced by a second preset opening, such as 0.5% or 1%, based on the required opening. This can preferentially reduce the liquid level of the deaerator ADG and gradually adjust the opening of CEX001VL to above the first preset opening (such as 70%). Specifically, it can be adjusted step by step with a preset opening (such as 2% or 5%) to gradually adjust the opening of the inlet isolation valve CEX001VL of the target water pump to above the first preset opening. In this way, before the vacuum of the CEX condenser is damaged, the liquid level of the deaerator ADG can be reduced to 0.5 m, and the liquid level of the condenser CEX can be reduced to 0.2 m, protecting the vacuum of the CEX condenser from being damaged while minimizing the liquid levels of the deaerator and the condenser as much as possible.

[0082] It should be noted that the above first preset opening, second preset opening, and preset opening adjustment step can be set according to actual application requirements, and the present application does not make specific restrictions on this.

[0083] As can be seen from the above, a drainage control method provided by an embodiment of the present application starts the target water pump immediately after the loop circulation of the secondary loop system is established, discharges some of the water in the loop circulation of the secondary loop system in advance, and can adjust the opening of the outlet valve of the target water pump for early drainage according to the water temperature change of the secondary loop system, thereby being able to control the cooling efficiency of the secondary loop system, drain water in advance while ensuring the cooling rate of the water in the secondary loop system, enabling the water in the secondary loop system to be emptied faster, and thus being able to greatly shorten the time required for draining the secondary loop system of a major overhaul unit, reduce the impact of the secondary loop system drainage on the major overhaul path, and improve the major overhaul efficiency.

[0084] As Figure 5 shown, in another embodiment of the present application, the above SEK sump is also connected to a standby pool through a temporary water pump. The above drainage control method further includes:

[0085] S13: Start the temporary water pump when the water level of the target water receiving tank exceeds the preset water level.

[0086] In specific applications, in addition to the strategy of draining the water in the secondary loop system in advance, the water receiving volume can also be considered to be expanded. Therefore, an embodiment of the present application sets up a standby pool to expand the water receiving volume during the major overhaul of the secondary loop system. By installing a temporary water pump and a hose in advance, the SEK sump is connected to the standby pool.

[0087] It should be noted that the function of the standby pool is to serve as a drainage temporary storage tank. That is, after the water level in the SEL water receiving tank exceeds the preset water level, the water in the SEK drainage pit can be drained into the standby pool first. After the water in the secondary circuit system is drained completely and the SEL water receiving tank is capable of receiving water again, the water in the standby pool is drained back into the SEK drainage pit and then drained into the SEL water receiving tank through the SEK drainage pit. The standby pool is used to expand the water receiving volume during the overhaul of the secondary circuit system, so that the water in the secondary circuit system can be emptied in advance and the time required for draining the water in the secondary circuit system during the overhaul is shortened.

[0088] In specific applications, the above-mentioned standby pool can adopt the neutralization pool of the condensate polishing system (hereinafter referred to as the ATE neutralization pool). The condensate polishing system ATE is only put into use when the water quality of the secondary circuit system deteriorates. The ATE neutralization pool is basically in a standby state during the operation of the unit and is no longer used during the overhaul. Moreover, the water in the neutralization pool can be discharged through the conventional island waste liquid collection system into the conventional island waste liquid storage and discharge system. Therefore, the ATE neutralization pools of the overhaul unit (referred to as Unit 1) and the daily unit (referred to as Unit 2) can both be utilized. Each ATE neutralization pool can receive 300 m 3 of water, and the two unit neutralization pools can receive 600 m 3 of water, which can greatly relieve the drainage pressure during the unit overhaul. Exemplarily, Figure 6 shows the schematic diagram of the architecture of the secondary circuit system provided by the embodiment of the present application. As Figure 6 shown, before draining the water in the secondary circuit system of the overhaul unit, two temporary pumps (the first temporary pump ( Figure 6 denoted as the 1# temporary pump in Figure 6 ) and the second temporary pump ( Figure 6 denoted as the 2# temporary pump in Figure 6 ) are installed in the 1SEK002PS (drainage pit) of the overhaul unit, and the drain pipes are respectively led to the ATE neutralization pool of the overhaul unit (i.e., the first ATE neutralization pool ( Figure 6 denoted as the 1ATE neutralization pool)) and the ATE neutralization pool of the daily unit (i.e., the second ATE neutralization pool ( Figure 6 denoted as the 2ATE neutralization pool)). Among them, the 1# temporary pump can connect the SEK drainage pit (1SEK002PS) of Unit 1 with the 1ATE neutralization pool, and the 2# temporary pump can connect the SEK drainage pit (1SEK002PS) of Unit 1 with the 2ATE neutralization pool, so that the water in the secondary circuit system of the overhaul unit can be drained from the SEK drainage pit (1SEK002PS) into these two ATE neutralization pools.

[0089] In specific applications, the start of the temporary water pump in 1SEK002PS can be determined based on the water level of the SEL water receiving tank and the drainage volume of the secondary loop system. Specifically, one temporary water pump can be started, or two temporary water pumps can be started, so as to discharge water into the 1ATE neutralization tank and / or the 2ATE neutralization tank.

[0090] In an embodiment of the present application, when there is an empty water receiving tank in the SEL, the temporary water pump can be shut down, and the water in the secondary loop system can be directly discharged to the SEL water receiving tank to ensure that the drainage of the secondary loop system of the overhauled unit is not interrupted.

[0091] In an embodiment of the present application, after the drainage of the secondary loop system of the overhauled unit is completed, the water in the ATE neutralization tank can be discharged to the SEL water receiving tank through the SEK. Specifically, the 1ATE neutralization tank can discharge water back to 1SEK002PS through the water pump connected to 1SEK002PS, and the 2ATE neutralization tank can discharge water to 2SEK002PS through the water pump connected to 2SEK002PS. Among them, 2SEK002PS is the SEK sump of Unit 2.

[0092] The SEL water receiving tank can include the 1st SEL water receiving tank OSEL0001BA, the 2nd SEL water receiving tank OSEL0002BA, and the 3rd SEL water receiving tank OSEL0003BA

[0093] In specific applications, since the SEL water receiving tank not only needs to receive the drainage of the secondary loop system of the overhauled unit, but also needs to receive the drainage of the daily unit, the 2nd SEL water receiving tank can be determined as the target SEL water receiving tank, so that the 3rd SEL water receiving tank can be used to receive the drainage of the daily unit.

[0094] Based on this, the above S13 can specifically be: determining the start strategy of the temporary water pump according to the drainage volume of the secondary loop system and the water receiving capacity of the standby pool, and starting the temporary water pump according to the start strategy of the temporary water pump.

[0095] In specific applications, the start strategy of the above temporary water pump is specifically used to control which temporary water pump to start, that is, which standby pool to choose to receive water. Specifically, the above start strategy can be to only start the 1# temporary water pump, or only start the 2# temporary water pump, or start two temporary water pumps at the same time.

[0096] In specific applications, if the drainage volume of the secondary loop system is large (for example, the opening of the outlet valve of the target water pump exceeds the first preset opening), it means that more water needs to be discharged from the SEK sump. Therefore, two temporary water pumps can be selected to start draining water at the same time to accelerate the drainage rate.

[0097] In the case where the drainage volume of the secondary loop system is small, only one temporary water pump can be started, that is, only one standby pool is used to receive water. At this time, the selection strategy can be to preferentially select the 1ATE neutralization pool as the drainage pool, or to select the neutralization pool with stronger water receiving capacity as the water receiving pool according to the water receiving status and water receiving capacity of the two standby pools.

[0098] Here, the above-mentioned water receiving capacity represents the amount of water that the standby pool can still receive. The larger the water receivable volume, the stronger the water receiving capacity. The above-mentioned water receiving status can represent the amount of water already received by the standby pool.

[0099] In the actual application process, when the liquid level of the 2# SEL water receiving tank reaches the preset water level, for example, 8 meters, the opening of CEX001VL can be reduced to 50%, and the 1# temporary water pump can be started to drain a part of the water into the 1ATE neutralization pool. When the 2# SEL water receiving tank is full, the 2# temporary water pump can be started to drain a part of the water into the 2ATE neutralization pool.

[0100] It should be noted that the above-mentioned preset water level can be set according to the actual application situation, and the present application does not make specific restrictions on this.

[0101] It should be noted that the above-mentioned liquid level and water temperature can collect liquid level data and temperature data through pre-set sensors, and the present application does not make specific restrictions on this. The adjustment of the opening of the water pump, the start and stop of the water pump can all be realized through the above-mentioned control and management equipment. The specific control and management equipment can set a drainage control service, obtain the data of various sensors such as liquid level sensors and temperature sensors through the drainage control service, and generate relevant control instructions such as the opening adjustment of the water pump, the start of the water pump, and the stop of the water pump according to the states feedback by each liquid level sensor and temperature sensor, and send them to the corresponding water pump, and the corresponding water pump executes the corresponding operations, such as controlling the start of CEX001VL, controlling the opening of CEX001VL to be adjusted to 50%, controlling the start of the 1# temporary water pump, controlling the stop of the 1# temporary water pump, controlling the start of the 2# temporary water pump, etc.

[0102] In actual application, by using the drainage control method provided by the embodiments of the present application, the drainage waiting time of the secondary loop system can be effectively shortened, the water in the secondary loop system can be emptied as soon as possible, so as to reduce the impact on other major repair processes, such as subsequent isolation and maintenance work, and save the time consumed in the critical path of the major repair. Through tests, about 8 hours of drainage waiting time can be saved.

[0103] It can be seen from this that by setting up a standby pool in the embodiments of the present application to expand the water receiving volume during the major repair of the secondary loop system, it can ensure that the drainage of the secondary loop system of the major repair unit is not interrupted, so that the water in the secondary loop system can be emptied in advance, and the time required for draining the water in the secondary loop system during the major repair is shortened.

[0104] It should be understood that the sequence numbers of the steps in the above embodiments do not indicate the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0105] Based on the drainage control method provided in the above embodiments, the embodiments of the present invention further provide an embodiment of a drainage control device for implementing the above method embodiments.

[0106] Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of a drainage control device provided by an embodiment of the present application. In the embodiments of the present application, each unit included in the drainage control device is used to execute Figure 5 the corresponding steps in the embodiments. Specifically, please refer to Figure 3 and Figure 3 the relevant descriptions in the corresponding embodiments. For the sake of convenience of description, only the parts related to this embodiment are shown. As Figure 7 shown, the above drainage control device 70 may include a start unit 701 and an adjustment unit 702, where:

[0107] The start unit 701 is used to start the target water pump after the loop circulation of the secondary loop system is established;

[0108] The adjustment unit 702 is used to adjust the opening degree of the outlet valve of the target water pump according to the temperature change of the secondary loop system, so as to control the cooling efficiency of the secondary loop system. The target water pump is used to discharge the water of the secondary loop system to the waste liquid collection sump of the conventional island.

[0109] In some implementation manners, the above adjustment unit 701 is specifically used to, if the water temperature of the deaerator or the water temperature of the high-pressure heater exceeds the preset temperature, adjust the opening degree of the outlet valve of the target water pump according to the water temperature change rate of the secondary loop system;

[0110] if the water temperature of the deaerator or the water temperature of the high-pressure heater does not exceed the preset temperature, reduce the opening degree of the condensate flow regulating valve, and increase the opening degree of the outlet valve of the target water pump to more than the first preset opening degree.

[0111] In some implementation manners, the above adjustment unit 701 includes a high-temperature adjustment unit and a low-temperature adjustment unit.

[0112] Among them, the high-temperature adjustment unit is used to reduce the opening degree of the outlet valve of the target water pump when the temperature change rate is less than the preset change rate; and increase the opening degree of the outlet valve of the target water pump when the temperature change rate is greater than or equal to the preset change rate.

[0113] The above-mentioned low-temperature regulation unit is used to reduce the opening degree of the condensate flow regulating valve by a second preset opening degree based on the required opening degree, so as to reduce the liquid level of the deaerator; and adjust the opening degree of the outlet valve of the target water pump step by step according to the preset opening degree, and gradually adjust the opening degree of the outlet valve of the target water pump to above the first preset opening degree.

[0114] In some implementation manners, the drainage control strategy further includes a temporary water pump control unit.

[0115] The temporary water pump control unit is used to start a temporary water pump when the water level of the target water receiving tank exceeds the preset water level, and the temporary water pump is used to discharge the water in the waste liquid collection sump of the conventional island to the standby pool.

[0116] In some implementation manners, the above-mentioned temporary water pump control unit can specifically be used to determine the start strategy of the temporary water pump according to the drainage volume of the secondary circuit system and the water receiving capacity of the standby pool; and start the temporary water pump according to the start strategy of the temporary water pump.

[0117] In some implementation manners, the standby pool includes the neutralization pool of the first condensate polishing system and the neutralization pool of the second condensate polishing system, the temporary water pumps include a first temporary water pump and a second temporary water pump, the first temporary water pump is connected to the neutralization pool of the first condensate polishing system and the waste liquid collection sump of the conventional island, the second temporary water pump is connected to the neutralization pool of the second condensate polishing system and the waste liquid collection sump of the conventional island, and the above-mentioned temporary water pump control unit is specifically used to reduce the opening degree of the outlet valve of the target water pump when the water level of the target water receiving tank exceeds the preset water level, and start the first temporary water pump, so as to discharge the water in the waste liquid collection sump of the conventional island to the neutralization pool of the first condensate polishing system;

[0118] After the target water receiving tank is full, start the second temporary water pump, so as to discharge the water in the waste liquid collection sump of the conventional island to the neutralization pool of the second condensate polishing system.

[0119] In some implementation manners, the temporary water pump control unit is further used to shut down the temporary water pump if it is detected that the waste liquid storage and discharge system of the conventional island is empty.

[0120] In some implementation manners, the above-mentioned drainage control device is further used to discharge the water in the standby pool to the waste liquid collection sump of the conventional island after the water in the secondary circuit system is emptied.

[0121] It should be noted that for the information interaction, execution process, etc. between the above-mentioned various units, since they are based on the same concept as the method embodiment of the present application, their specific functions and the technical effects brought, specifically, reference can be made to the method embodiment part, and details are not described herein again.

[0122] Therefore, the drainage control method provided by the embodiments of the present application can also start the target water pump immediately after the loop circulation of the secondary loop system is established, drain part of the water in the loop circulation of the secondary loop system in advance, and can adjust the opening degree of the water outlet valve of the target water pump for pre-drainage according to the water temperature change of the secondary loop system, so as to control the cooling efficiency of the secondary loop system, drain water in advance while ensuring the cooling rate of the water in the secondary loop system, so that the water in the secondary loop system can be emptied faster, and further can greatly shorten the time required for draining the secondary loop system of the overhaul unit, reduce the impact of the secondary loop system drainage on the overhaul path, and improve the overhaul efficiency.

[0123] Figure 8 is a schematic structural diagram of a terminal device provided by another embodiment of the present application. As Figure 8 shown, the terminal device 8 provided in this embodiment includes: a processor 80, a memory 81, and a computer program 82 stored in the memory 81 and executable on the processor 80, such as an image segmentation program. When the processor 80 executes the computer program 82, the steps in the embodiments of the above-mentioned various drainage control methods are implemented, such as Figure 3 shown in S11 - S12. Alternatively, when the processor 80 executes the computer program 82, the functions of each module / unit in the embodiments of the above-mentioned various terminal devices are implemented, such as Figure 7 the functions of the units 701 - 702 shown.

[0124] Exemplarily, the computer program 82 can be divided into one or more modules / units. The one or more modules / units are stored in the memory 81 and executed by the processor 80 to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program 82 in the terminal device 8. For example, the computer program 82 can be divided into an acquisition unit, a determination unit, and a calculation unit. For the specific functions of each unit, please refer to Figure 7 the relevant descriptions in the corresponding embodiments, which will not be elaborated here.

[0125] The above terminal device may include but is not limited to a processor 80 and a memory 81. Those skilled in the art can understand that Figure 8 merely examples of the terminal device 8, which do not constitute a limitation on the terminal device 8, and may include more or fewer components than shown in the figure, or combine some components, or different components. For example, the above terminal device may further include input / output devices, network access devices, buses, etc.

[0126] The so-called processor 80 may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0127] The above-mentioned memory 81 may be an internal storage unit of the above-mentioned terminal device 8, such as the hard disk or memory of the terminal device 8. The above-mentioned memory 81 may also be an external storage device of the above-mentioned terminal device 8, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, etc. equipped on the above-mentioned terminal device 8. Further, the above-mentioned memory 81 may also include both the internal storage unit of the above-mentioned terminal device 8 and the external storage device. The above-mentioned memory 81 is used to store the above-mentioned computer program and other programs and data required by the above-mentioned terminal device. The above-mentioned memory 81 may also be used to temporarily store data that has been output or will be output.

[0128] The embodiment of the present application also provides a computer-readable storage medium. Please refer to Figure 9 , Figure 9 is a schematic structural diagram of a computer-readable storage medium provided by the embodiment of the present application. As shown in Figure 9 , a computer program 82 is stored in the computer-readable storage medium 90. When the computer program 82 is executed by a processor, the above-mentioned drainage control method can be implemented.

[0129] The embodiment of the present application provides a computer program product. When the computer program product runs on a terminal device, the terminal device can be made to implement the above-mentioned drainage control method when executed.

[0130] Those skilled in the art can clearly understand that, for the convenience and conciseness of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the above terminal device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0131] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0132] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in the form of hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0133] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A drainage control method is applied to the secondary loop system of a nuclear power plant, characterized in that, Including: After the loop circulation of the secondary circuit system is established, start the target water pump; Adjust the opening degree of the outlet valve of the target water pump according to the water temperature change of the secondary circuit system to control the cooling efficiency of the secondary circuit system, wherein the target water pump is used to discharge the water of the secondary circuit system to the waste liquid collection and drainage sump of the conventional island.

2. The drainage control method according to claim 1, wherein The secondary circuit system includes a deaerator and a high-pressure heater. Adjusting the opening degree of the outlet valve of the target water pump according to the water temperature change of the secondary circuit system includes: If the water temperature of the deaerator or the high-pressure heater exceeds the preset temperature, adjust the opening degree of the outlet valve of the target water pump according to the water temperature change rate of the secondary circuit system; If the water temperature of the deaerator or the high-pressure heater does not exceed the preset temperature, reduce the opening degree of the condensate flow regulating valve and increase the opening degree of the outlet valve of the target water pump to more than the first preset opening degree.

3. The drainage control method according to claim 2, wherein The step of adjusting the opening degree of the outlet valve of the target water pump according to the water temperature change rate of the secondary circuit system when the water temperature of the deaerator or the high-pressure heater exceeds the preset temperature includes: When the temperature change rate is less than the preset change rate, reduce the opening degree of the outlet valve of the target water pump; When the temperature change rate is greater than or equal to the preset change rate, increase the opening degree of the outlet valve of the target water pump.

4. The drainage control method according to claim 2, wherein The step of reducing the opening degree of the condensate flow regulating valve and gradually increasing the opening degree of the outlet valve of the target water pump to more than the preset opening degree when the water temperature of the deaerator or the high-pressure heater does not exceed the preset temperature includes: Reduce the opening degree of the condensate flow regulating valve by a second preset opening degree based on the required opening degree to reduce the liquid level of the deaerator; Adjust the opening degree of the outlet valve of the target water pump to more than the first preset opening degree step by step according to the preset opening degree adjustment.

5. The drainage control method according to any one of claims 1 to 4, characterized in that The waste liquid collection and drainage sump of the conventional island is connected to the standby pool through a temporary water pump. The method further includes: When the water level of the target water receiving tank exceeds the preset water level, start the temporary water pump, and the temporary water pump is used to discharge the water in the waste liquid collection and drainage sump of the conventional island to the standby pool.

6. The drainage control method according to claim 5, characterized in that The step of starting the temporary water pump when the water level of the target water receiving tank exceeds the preset water level includes: Determine the start strategy of the temporary water pump according to the drainage volume of the secondary circuit system and the water receiving capacity of the standby pool; Start the temporary water pump according to the start strategy of the temporary water pump.

7. The drainage control method according to claim 5, characterized in that The standby pool includes a neutralization pool of the first condensate polishing system and a neutralization pool of the second condensate polishing system. The temporary water pump includes a first temporary water pump and a second temporary water pump. The first temporary water pump is connected to the neutralization pool of the first condensate polishing system and the waste liquid collection and drainage sump of the conventional island, and the second temporary water pump is connected to the neutralization pool of the second condensate polishing system and the waste liquid collection and drainage sump of the conventional island. The step of starting the temporary water pump when the water level of the target water receiving tank exceeds the preset water level includes: When the water level of the target water receiving tank exceeds the preset water level, reduce the opening degree of the outlet valve of the target water pump and start the first temporary water pump to discharge the water in the waste liquid collection and drainage sump of the conventional island to the neutralization pool of the first condensate polishing system; After the target water receiving tank is full, start the second temporary water pump to discharge the water in the waste liquid collection sump of the conventional island to the neutralization tank of the second condensate polishing system.

8. A drainage control device, characterized in that, Including: A starting unit for starting a target water pump after the loop circulation of the secondary circuit system is established; An adjusting unit for adjusting the opening degree of the outlet valve of the target water pump according to the water temperature change of the secondary circuit system to control the cooling efficiency of the secondary circuit system, wherein the target water pump is used to discharge the water of the secondary circuit system to the waste liquid collection sump of the conventional island.

9. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that When the processor executes the readable instructions of the computer program, the drainage control method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that, When the readable instructions of the computer program are executed by the processor, the drainage control method according to any one of claims 1 to 7 is implemented.

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