Auxiliary water supply system and its circulating deoxygenation device

Abstract

This invention relates to an auxiliary feedwater system and its circulating deoxygenation device. The device includes: a sensing module for monitoring real-time parameters of the deaerator, including the temperature of the desalinated and deoxygenated water within the deaerator; a steam control channel for controlling the steam input flow rate; a circulating deoxygenation loop for activating when the desalinated and deoxygenated water temperature is below a set temperature, to achieve circulating deoxygenation through the deaerator; a water exchange loop for activating when the desalinated and deoxygenated water temperature is above or equal to a set temperature, to extract desalinated and deoxygenated water from the circulating deoxygenation loop and transport it to the auxiliary feedwater tank, and to obtain makeup water from the auxiliary feedwater tank and send it to the deaerator; and a control module for controlling the operation of the steam control channel, the circulating deoxygenation loop, and the water exchange loop according to the acquired circulating deoxygenation commands and real-time parameters. This invention can automatically circulate and deoxygenate the water stored in the auxiliary feedwater tank, ensuring the water quality in the auxiliary feedwater tank meets standards, eliminating the need for nuclear power plants to drain water and regenerate water during major overhauls, and avoiding delays in the overhaul schedule.

Description

Technical Field

[0001] This invention relates to the field of auxiliary water supply system technology, and in particular to an auxiliary water supply system and its circulating deoxygenation device. Background Technology

[0002] Regular overhauls are crucial for maintaining the safe and reliable operation of nuclear power plants. However, there is no clear solution for storing deoxygenated water after initial water production and for handling water with substandard oxygen content. Draining the water and re-producing it wastes working fluid and extends the overhaul period, impacting plant efficiency. Therefore, nuclear power plants urgently need a technical solution for handling water stored in the auxiliary feedwater system. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an auxiliary water supply system and its circulating deoxygenation device.

[0004] The technical solution adopted by this invention to solve its technical problem is: to construct a circulating deoxygenation device for an auxiliary water supply system, wherein the auxiliary water supply system includes a deaerator and an auxiliary water supply tank, and the circulating deoxygenation device includes: The sensing module is used to monitor the real-time parameters of the deaerator; the real-time parameters include the temperature of the desalinated and deoxygenated water inside the deaerator. A steam control channel, mechanically connected to the steam inlet of the deaerator, is used to control the steam input flow rate; The circulating deoxygenation loop is mechanically connected to the outlet and return outlet of the deaerator and is used to open when the temperature of the desalinated and deoxygenated water is lower than the set temperature, so as to achieve circulating deoxygenation through the deaerator. The water exchange loop is mechanically connected to the deaerator and the auxiliary water supply tank. It is used to open when the temperature of the desalinated and deoxygenated water is greater than or equal to the set temperature, so as to extract the desalinated and deoxygenated water in the circulating deaerator loop and deliver it to the auxiliary water supply tank, and to obtain makeup water from the auxiliary water supply tank and send it to the deaerator. The control module is electrically connected to the steam control channel, the sensing module, the circulating deoxygenation loop, and the water exchange loop, and is used to control the operation of the steam control channel, the circulating deoxygenation loop, and the water exchange loop according to the acquired circulating deoxygenation command and the real-time parameters.

[0005] Preferably, the circulating deaeration loop includes a first circulating water pump and a first electric valve. The inlet of the first circulating water pump is mechanically connected to the outlet of the deaerator, the outlet of the first circulating water pump is mechanically connected to the first end of the first electric valve, the second end of the first electric valve is mechanically connected to the return port of the deaerator, and the first circulating water pump and the first electric valve are electrically connected to the control module.

[0006] Preferably, the water exchange loop includes a second circulating water pump, a second electric valve, a third electric valve, and a fourth electric valve; The inlet of the second circulating water pump is mechanically connected to the outlet of the auxiliary water supply tank via the second electric valve. The outlet of the second circulating water pump is mechanically connected to the first end of the third electric valve. The second end of the third electric valve is mechanically connected to the return water port of the deaerator. The first end of the first electric valve is mechanically connected to the first end of the fourth electric valve. The second end of the fourth electric valve is mechanically connected to the inlet of the auxiliary water supply tank.

[0007] Preferably, the step of the control module controlling the operation of the steam control channel, the circulating deoxygenation loop, and the water exchange loop according to the acquired circulating deoxygenation command and the real-time parameters includes: S10. Determine if a deoxygenation cycle command has been received. If so, execute S20. S20. Control or keep the steam control channel open, the first circulating water pump open, and the first electric valve open, and then execute S30. S30. Determine whether the temperature of the desalinated and deoxygenated water is lower than the set temperature. If yes, return to S20; otherwise, execute S40. S40. Control or keep the second circulating water pump on, the first electric valve closed, the fourth electric valve open, and the third electric valve open, and then execute S50. S50. Monitor the total flow of desalinated and deoxygenated water during the current start-up process of the second circulating water pump. When the total flow of desalinated and deoxygenated water is greater than or equal to the set total, return to S10.

[0008] Preferably, the circulating deaerator further includes an exhaust unit, which is mechanically connected to the deaerator and electrically connected to the control module. The control module is also used to control or keep the exhaust unit open when performing S20, and to control the exhaust unit to close before returning to S10.

[0009] Preferably, in S20, the method further includes: controlling the steam control channel and the first circulating water pump to start simultaneously, and controlling the first electric valve to open after a first set time delay; S40 further includes: first, controlling the second circulating water pump and the third electric valve to open simultaneously, then controlling the first electric valve to close, and then controlling the fourth electric valve to open after a second set time delay.

[0010] Preferably, the water exchange loop further includes a heat exchanger and a fifth electric valve. The cold-side inlet of the heat exchanger is mechanically connected to the second end of the third electric valve, the cold-side outlet of the heat exchanger is mechanically connected to the return outlet of the deaerator, the second end of the fourth electric valve is mechanically connected to the hot-side inlet of the heat exchanger, and the hot-side outlet of the heat exchanger is mechanically connected to the inlet of the auxiliary water supply tank via the fifth electric valve. S40 further includes: when controlling the fourth electric valve to open, it also simultaneously controls the fifth electric valve to open.

[0011] Preferably, the real-time parameters also include the desalination and deoxygenation water level in the deaerator; The water exchange loop also includes a second regulating valve, which is mechanically connected between the second end of the third electric valve and the cold side inlet of the heat exchanger, and is electrically connected to the control module. S40 further includes: real-time monitoring of the change in the desalination and deoxygenation water level, so as to control the opening of the second regulating valve according to the change in water level, so as to keep the desalination and deoxygenation water level within a set water level range.

[0012] Preferably, the real-time parameters also include the steam pressure inside the deaerator; The steam control channel includes a sixth electric valve and a first regulating valve. The first end of the sixth electric valve is connected to steam, and the second end of the sixth electric valve is connected to steam via the first regulating valve and mechanically connected to the steam inlet of the deaerator. The sixth electric valve and the first regulating valve are electrically connected to the control module. In S20, controlling or keeping the steam control channel open includes: controlling the sixth electric valve to open and monitoring the change in steam pressure in real time, so as to control the opening of the first regulating valve according to the change in pressure, so that the steam pressure is kept within the set pressure range.

[0013] The present invention also constructs an auxiliary water supply system, including the circulating deoxygenation device described above.

[0014] Implementing this invention has the following beneficial effects: it can automatically circulate and deoxygenate the water stored in the auxiliary water supply tank, which is simple to operate, reduces the risk of human error, and can also ensure that the water quality in the auxiliary water supply tank is up to standard. Therefore, there is no need to drain water and re-produce water during major repairs, thus avoiding delays in the major repair period. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the circulating deoxygenation device in some embodiments of the present invention; Figure 2This is a schematic diagram of the structure of the circulating deoxygenation device in some other embodiments of the present invention. Detailed Implementation

[0016] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the circulating deoxygenation device in some embodiments of the present invention. This circulating deoxygenation device is applied to the auxiliary feedwater system and can automatically circulate and deoxygenate the water stored in the auxiliary feedwater tank. It is simple to operate, eliminating the need for complex operations by the operator, reducing the risk of human error, and allowing the operator to focus more on controlling and monitoring the unit's status. This plays a positive role in improving the operational safety of nuclear power plants. It also ensures that the water quality in the auxiliary feedwater tank meets standards, thus eliminating the need for drainage and re-water production during major overhauls, avoiding delays in the overhaul schedule. Furthermore, the auxiliary feedwater system may include equipment such as a deaerator, auxiliary feedwater tank, and condensate tank; specific details can be found in existing technologies and will not be elaborated here.

[0018] It should be noted that in this invention, the paths for transmitting desalinated and deoxygenated water or steam are all mechanically connected through pipelines.

[0019] like Figure 1 As shown, the circulating deoxygenation device may include a sensing module 1, a steam control channel 2, a circulating deoxygenation loop 3, and a water exchange loop 4. The sensing module 1 monitors the real-time parameters of the deaerator, including the temperature of the desalinated and deoxygenated water within the deaerator. The steam control channel 2 is mechanically connected to the steam inlet of the deaerator and controls the steam input flow rate. The circulating deoxygenation loop 3 is mechanically connected to the outlet and return outlet of the deaerator and is activated when the desalinated and deoxygenated water temperature is lower than a set temperature to achieve circulating deoxygenation through the deaerator. The water exchange loop 4 is mechanically connected to the deaerator, the auxiliary feedwater tank, and the circulating deoxygenation loop 3. The water exchange loop 4 is activated when the desalinated and deoxygenated water temperature is greater than or equal to a set temperature to extract desalinated and deoxygenated water from the circulating deoxygenation loop 3 and transport it to the auxiliary feedwater tank, as well as to obtain makeup water from the auxiliary feedwater tank and send it to the deaerator. The control module 5 is electrically connected to the steam control channel 2, the sensing module 1, the circulating deoxygenation loop 3, and the water exchange loop 4. The control module 5 is used to control the operation of the steam control channel 2, the circulating deoxygenation loop 3, and the water exchange loop 4 according to the obtained circulating deoxygenation command and real-time parameters.

[0020] Specifically, after receiving the circulating deoxygenation command, when the temperature of the desalinated and deoxygenated water is lower than the set temperature, the control module 5 controls the steam control channel 2 to work according to real-time parameters, thereby controlling the steam input flow of the deaerator. It also controls the circulating deoxygenation loop 3 to cooperate with the deaerator to circulate and deoxygenate the desalinated and deoxygenated water stored in the deaerator. When the temperature of the desalinated and deoxygenated water is greater than or equal to the set temperature, it indicates that the quality of the desalinated and deoxygenated water in the deaerator is qualified. At this time, the water exchange loop 4 of the control module 5 sends the qualified desalinated and deoxygenated water to the auxiliary feed water tank, and obtains new desalinated and deoxygenated water (i.e., the desalinated and deoxygenated water originally stored in the auxiliary feed water tank) from the auxiliary feed water tank to replenish the deaerator in preparation for the next deoxygenation.

[0021] In some embodiments, the circulating deoxygenation loop 3 may include Figure 2 The first circulating water pump 31 and the first electric valve 32 are shown. The inlet of the first circulating water pump 31 is mechanically connected to the outlet of the deaerator. The outlet of the first circulating water pump 31 is mechanically connected to the first end of the first electric valve 32. The second end of the first electric valve 32 is mechanically connected to the return port of the deaerator. The first circulating water pump 31 and the first electric valve 32 are electrically connected to the control module 5.

[0022] In this embodiment, the opening of both the first electric valve 32 and the first circulating water pump 31 is equivalent to the opening of the circulating deoxygenation loop 3. When the circulating deoxygenation loop 3 is open, desalinated and deoxygenated water is drawn from the deaerator outlet by the first circulating water pump 31 and, via the first electric valve, returned to the deaerator, thus achieving desalinated and deoxygenated water circulation. During this circulation, the deaerator utilizes the heat carried by steam to heat and deoxygenate the circulating desalinated and deoxygenated water. Both the first circulating water pump 31 and the first electric valve 32 are controlled by the control module 5. The first circulating water pump 31 provides the power for circulating and heating the desalinated and deoxygenated water; the first electric valve 32 works in conjunction with the first circulating water pump 31 to create a loop that continuously circulates the desalinated and deoxygenated water within the deaerator.

[0023] In some embodiments, the water exchange loop 4 may include Figure 2 The diagram shows a second circulating water pump 41, a second electric valve 42, a third electric valve 43, and a fourth electric valve 44. The inlet of the second circulating water pump 41 is mechanically connected to the outlet of the auxiliary water supply tank via the second electric valve 42. The outlet of the second circulating water pump 41 is mechanically connected to the first end of the third electric valve 43. The second end of the third electric valve 43 is mechanically connected to the return water inlet of the deaerator. The first end of the first electric valve 32 is mechanically connected to the first end of the fourth electric valve 44. The second end of the fourth electric valve 44 is mechanically connected to the inlet of the auxiliary water supply tank.

[0024] In this embodiment, the opening of the second circulating water pump 41, the second electric valve 42, the third electric valve 43, and the fourth electric valve 44 is equivalent to the opening of the water exchange loop 4. When the water exchange loop 4 is opened, the water stored in the auxiliary water supply tank is transported to the return port of the deaerator via the second electric valve 42, the second circulating water pump 41, and the third electric valve 43. At the same time, the fourth electric valve 44 extracts the desalinated and deoxygenated water after circulation heating from the circulating deoxygenation loop 3 and transports the desalinated and deoxygenated water to the inlet of the auxiliary water supply tank. The opening and closing of the second circulating water pump 41, the second electric valve 42, the third electric valve 43, and the fourth electric valve 44 are all controlled by the control module 5. The second circulating water pump 41 is the power source for pumping water from the auxiliary water supply tank, while the second electric valve 42, the third electric valve 43, and the fourth electric valve 44 are used to control the on / off state of the corresponding paths.

[0025] In some embodiments, the process by which the control module 5 controls the operation of the circulating deoxygenation loop 3 and the water exchange loop 4 can be referred to steps S10 to S50.

[0026] Step S10 may include: determining whether a circulating deoxygenation command has been received; if so, proceeding to S20. In this step, the operator can input the circulating deoxygenation command through a human-machine interface device (such as a button, mouse, keyboard, etc.). Alternatively, the circulating deoxygenation command can also be automatically generated by the control module 5 using relevant algorithms. For example, determining whether the duration of no external water supply from the auxiliary water tank exceeds the set re-deoxygenation time; if so, generating a circulating deoxygenation command; or, obtaining the oxygen content of the desalinated and deoxygenated water in the auxiliary water tank, determining whether the oxygen content exceeds a set threshold; if so, generating a circulating deoxygenation command. The oxygen content of the desalinated and deoxygenated water can be measured using existing oxygen monitoring devices, such as an optical analyzer.

[0027] Furthermore, when no deoxygenation command is received, S10 can be re-executed after a certain delay. This eliminates the need for continuous S10 judgment and helps reduce the computational burden on control module 5.

[0028] Step S20 may include: controlling or maintaining the steam control channel 2 open, the first circulating water pump 31 open, the first electric valve 32 open, and then executing S30.

[0029] In this step, if a device that needs to be turned on is not turned on, then turn on the corresponding device; if the device is already turned on, then keep the corresponding device in the on state.

[0030] In some embodiments, step S20 may further include: controlling the steam control channel 2 and the first circulating water pump 31 to start simultaneously, and controlling the first electric valve 32 to open after a first set time delay.

[0031] In this embodiment, controlling the steam control channel 2 to open first allows the deaerator to quickly obtain the steam required for deoxygenation, thus heating the deaerator as soon as possible and preparing it for deoxygenation. Controlling the first circulating water pump 31 to start early helps reduce the starting current and lowers the load on the first circulating water pump 31, which is beneficial for establishing the outlet pressure head. After the first electric valve 32 opens, the demineralized and deoxygenated water will circulate through the deaerator, achieving circulating deoxygenation. Furthermore, the first set time can be customized according to requirements, for example, it can be set to 60 seconds.

[0032] Step S30 may include: determining whether the temperature of the desalinated and deoxygenated water is lower than the set temperature; if so, return to S20; otherwise, execute S40.

[0033] In this step, if the temperature of the desalinated and deoxygenated water is lower than the set temperature, it means that the water quality of the desalinated and deoxygenated water is still not qualified. Therefore, it is necessary to return to step S20 to continue the cycle deoxygenation until the temperature of the desalinated and deoxygenated water is greater than or equal to the set temperature, at which point the water quality is qualified, and then proceed to step S40.

[0034] Step S40 may include: controlling or keeping the second circulating water pump 41 on, the first electric valve 32 closed, the fourth electric valve 44 open, and the third electric valve 43 open, and then executing S50.

[0035] In some embodiments, step S40 may further include: first, controlling the second circulating water pump 41 and the third electric valve 43 to open simultaneously, then controlling the first electric valve 32 to close, and then controlling the fourth electric valve 44 to open after a second set time delay.

[0036] It should be noted that if the fourth electric valve 44 is opened before the second circulating water pump 41 and the third electric valve 43, although this can prevent cold water from entering the deaerator and causing a decrease in deoxygenation efficiency, there is a risk of cavitation and pump tripping when the deaerator liquid level drops. Furthermore, the current water level in the auxiliary feedwater tank is high, which is not conducive to water intake. While opening the fourth electric valve 44 last may result in a decrease in deoxygenation efficiency due to cold water entering the deaerator, it avoids cavitation caused by a drop in the deaerator liquid level. In this embodiment, controlling the closing of the first electric valve 32 can be performed simultaneously with the opening of the second circulating water pump 41. Closing the first electric valve 32 is equivalent to stopping the circulating deaerator. The goal of controlling the opening of the fourth electric valve 44 only after a second set time delay following the closing of the first electric valve 32 is to account for valve action time, thus avoiding the unstable flow range and preventing pump stalling damage.

[0037] In some embodiments, the second set time can be set within the range of 6 to 10 seconds. Verification has shown that 8 seconds is preferable, as it ensures stable flow and prevents damage to the water pump.

[0038] Step S50 may include: monitoring the total flow of desalinated and deoxygenated water through the second circulating water pump 41 during this start-up process, and returning to S10 when the total flow of desalinated and deoxygenated water is greater than or equal to the set total.

[0039] In this step, since the rated flow rate of the second circulating water pump 41 transporting desalinated and deoxygenated water is relatively fixed, the total flow of desalinated and deoxygenated water can be characterized by the operating time of the second circulating water pump 41. For example, if the operating time of the second circulating water pump 41 after this start-up is as high as the third set time, it is determined that the total flow of desalinated and deoxygenated water is greater than or equal to the set total. Alternatively, the circulating deoxygenation device can also be equipped with a flow meter at the outlet of the second circulating water pump 41, electrically connected to the control module 5. The control module 5 is also used to monitor the total flow of desalinated and deoxygenated water during the current start-up process of the second circulating water pump 41 through the flow meter.

[0040] It is easy to understand that the total flow rate of desalination and deoxygenation water or the third set time depends on the capacity of the deaerator and the total capacity of all pipelines in the circulating deoxygenation loop. The larger the total capacity, the larger the total flow rate of desalination and deoxygenation water or the third set time. The total flow rate of desalination and deoxygenation water can be set to 0.5 to 0.9 times the total capacity, or the third set time can be set to the product of the total capacity divided by the rated flow rate of the second circulating water pump 41 and then multiplied by 0.5 to 0.9.

[0041] In some embodiments, the circulating deoxygenation device may further include Figure 2 The exhaust unit 6 is mechanically connected to the deaerator and electrically connected to the control module 5. Accordingly, the control module 5 is also used to control or keep the exhaust unit 6 open during execution S20, and to control the exhaust unit 6 to close before returning to S10.

[0042] In this embodiment, the exhaust unit 6 may include an exhaust valve, one end of which is mechanically connected to the top of the deaerator, and the other end is connected to the outside of the plant, so as to exhaust the air inside the deaerator. It is easy to understand that opening the exhaust unit 6 during step S20 can remove any residual oxygen inside the deaerator, ensuring the deaerator effect and preventing excessive pressure rise in the deaerator, which would worsen the deaerator effect. Controlling the exhaust unit 6 to close during step S50 but before returning to step S10 can prevent the deaerator from contacting outside air.

[0043] In some embodiments, the water exchange loop 4 may also include Figure 2The heat exchanger 45 and the fifth electric valve 46 are shown. The cold-side inlet of the heat exchanger 45 is mechanically connected to the second end of the third electric valve 43, and the cold-side outlet of the heat exchanger 45 is mechanically connected to the return outlet of the deaerator. The second end of the fourth electric valve 44 is mechanically connected to the hot-side inlet of the heat exchanger 45, and the hot-side outlet of the heat exchanger 45 is mechanically connected to the inlet of the auxiliary water supply tank via the fifth electric valve 46. Accordingly, step S40 may also include: when controlling the fourth electric valve 44 to open, simultaneously controlling the fifth electric valve 46 to open.

[0044] In this embodiment, the function of the heat exchanger 45 is to transfer heat from its hot side to its cold side. That is, under the action of the heat exchanger 45, the desalinated and deoxygenated water that is transferred back to the auxiliary feed water tank can be cooled down in advance by the heat exchanger 45. This can reduce the damage to the auxiliary feed water tank caused by the input of high-temperature desalinated and deoxygenated water. The heat removed by cooling the desalinated and deoxygenated water is also used to heat the desalinated and deoxygenated water input from the auxiliary feed water tank to the deaerator, which helps to improve thermal efficiency and deoxygenation efficiency.

[0045] In some embodiments, the real-time parameters may also include the desalination and deoxygenation water level in the deaerator. Correspondingly, the water exchange loop 4 may also include... Figure 2 The second regulating valve 47 shown is mechanically connected between the second end of the third electric valve 43 and the cold-side inlet of the heat exchanger 45, and electrically connected to the control module 5. Step S40 may further include: real-time monitoring of changes in the desalination and deoxygenation water level to control the opening of the second regulating valve 47 according to the level changes, so as to maintain the desalination and deoxygenation water level within a set range.

[0046] In this embodiment, the flow rate of desalination and deoxygenation water supplied to the deaerator can be controlled by controlling the opening of the second regulating valve 47, thereby keeping the desalination and deoxygenation water level within the set range. This can prevent cavitation in the deaerator caused by a drop in water level.

[0047] In some embodiments, the real-time parameters may also include the steam pressure within the deaerator. Accordingly, the steam control channel 2 may include... Figure 2 The sixth electric valve 21 and the first regulating valve 22 are shown. The first end of the sixth electric valve 21 is connected to steam, and the second end of the sixth electric valve 21 is connected to the steam inlet of the deaerator via the first regulating valve 22. The sixth electric valve 21 and the first regulating valve 22 are electrically connected to the control module 5. In step S20, controlling or maintaining the steam control channel 2 open may include: controlling the sixth electric valve 21 to open and monitoring changes in steam pressure in real time, so as to control the opening degree of the first regulating valve 22 according to the pressure changes, thereby maintaining the steam pressure within a set pressure range.

[0048] In this embodiment, the steam flow rate input to the deaerator can be controlled by controlling the opening of the first regulating valve 22, thereby keeping the steam pressure within the set pressure range. This not only prevents overpressure on the steam side of the deaerator, but also avoids poor deaeration effect due to insufficient steam pressure.

[0049] In some embodiments, the sensing module 1 may include an existing thermometer, pressure gauge, and level detection module. The thermometer may be installed inside the deaerator and electrically connected to the control module 5, for measuring the temperature of the desalinated and deoxygenated water. The pressure gauge may be installed inside the deaerator and electrically connected to the control module 5, for measuring the steam pressure input to the deaerator. The level detection module may be installed inside the deaerator and electrically connected to the control module 5, for measuring the level of the desalinated and deoxygenated water within the deaerator.

[0050] In some embodiments, the control module 5 may include an existing PLC controller or other type of host computer, which can execute relevant program algorithms to control the opening and closing of relevant valves and water pumps, and is not limited here.

[0051] The present invention also provides an auxiliary water supply system, which may include the circulating deoxygenation device provided in the embodiments of the present invention.

[0052] Furthermore, the auxiliary water supply system may also include Figure 2 As shown, there are input isolation channel 7 and output isolation channel 8. The input end of input isolation channel 7 is mechanically connected to the outlet of the deaerator, the first output end of input isolation channel 7 is mechanically connected to the inlet of the first circulating water pump 31, and the second output end of input isolation channel 7 is mechanically connected to the inlet of the second circulating water pump 41. Input isolation channel 7 is used to control the connection and disconnection between the outlet of the deaerator and the first and second circulating water pumps 31 and 41. Output isolation channel 8 is mechanically connected between the outlet of the first circulating water pump 31 and the outlet of the second circulating water pump 41, and is used to close during circulating deaeration.

[0053] In some embodiments, such as Figure 2As shown, the input isolation channel 7 may include a first valve 71 and a second valve 72. The first end of the first valve 71 and the first end of the second valve 72 are mechanically connected to the outlet of the deaerator. The second end of the first valve 71 is mechanically connected to the inlet of the first circulating water pump 31, and the second end of the second valve 72 is mechanically connected to the inlet of the second circulating water pump 41. Correspondingly, the output isolation channel 8 may include a third valve, which is mechanically connected between the outlet of the first circulating water pump 31 and the outlet of the second circulating water pump 41. The first end of the first valve 71 and the second valve 72 are used to control the flow of water into the first circulating water pump 31 and the second circulating water pump 41, respectively. During circulating heating, the first valve 71 is open, the second valve 72 is closed, and the third valve is closed. When the auxiliary water supply system is performing its water supply task, the first valve 71, the second valve 72, and the third valve can be opened as needed, making the first circulating water pump 31 and the second circulating water pump 41 redundant power devices.

[0054] In some embodiments, the auxiliary water supply system may further include Figure 2 The diagram shows the fourth valve 10, the fifth valve 91, the third regulating valve 92, and the condensate tank 93. The fourth valve 10 is mechanically connected between the outlet of the first circulating water pump 31 and the first end of the first electric valve 32, and is used to control the opening and closing of the outlet of the first circulating water pump 31. The steam outlet of the deaerator is connected to the condensate tank 93 via two routes: one via the fifth valve 91, and the other via the third regulating valve 92. The fifth valve 91 controls the opening and closing of the steam outlet and the condensate tank 93, the third regulating valve 92 regulates the flow rate between the steam outlet and the condensate tank 93, and the condensate tank 93 collects the liquid after the steam has been cooled and condensed by the deaerator.

[0055] In some embodiments, the first to fifth valves can all be electric valves and can be electrically connected to the control module 5 so as to be controlled by the control module 5.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0057] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in 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 implementations should not be considered beyond the scope of this invention.

[0058] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0059] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A circulating deaerator for use in an auxiliary water supply system, the auxiliary water supply system comprising a deaerator and an auxiliary water supply tank, characterized in that, The circulating deoxygenation device includes: The sensing module (1) is used to monitor the real-time parameters of the deaerator; the real-time parameters include the temperature of the desalinated and deoxygenated water inside the deaerator. Steam control channel (2) is mechanically connected to the steam inlet of the deaerator and is used to control the steam input flow rate; The circulating deoxygenation loop (3) is mechanically connected to the outlet and return outlet of the deaerator and is used to open when the temperature of the desalinated and deoxygenated water is lower than the set temperature, so as to achieve circulating deoxygenation through the deaerator. The water exchange loop (4) is mechanically connected to the deaerator, the auxiliary water supply tank and the circulating deaerator loop (3), and is used to open when the temperature of the desalinated and deoxygenated water is greater than or equal to the set temperature, so as to extract the desalinated and deoxygenated water in the circulating deaerator loop (3) and transport it to the auxiliary water supply tank, and to obtain makeup water from the auxiliary water supply tank and send it to the deaerator. The control module (5) is electrically connected to the steam control channel (2), the sensing module (1), the circulating deoxygenation loop (3) and the water exchange loop (4), and is used to control the operation of the steam control channel (2), the circulating deoxygenation loop (3) and the water exchange loop (4) according to the obtained circulating deoxygenation command and the real-time parameters.

2. The circulating deoxygenation device according to claim 1, characterized in that, The circulating deaeration loop (3) includes a first circulating water pump (31) and a first electric valve (32). The inlet of the first circulating water pump (31) is mechanically connected to the outlet of the deaerator. The outlet of the first circulating water pump (31) is mechanically connected to the first end of the first electric valve (32). The second end of the first electric valve (32) is mechanically connected to the return port of the deaerator. The first circulating water pump (31) and the first electric valve (32) are electrically connected to the control module (5).

3. The circulating deoxygenation device according to claim 2, characterized in that, The water exchange loop (4) includes a second circulating water pump (41), a second electric valve (42), a third electric valve (43) and a fourth electric valve (44). The inlet of the second circulating water pump (41) is mechanically connected to the outlet of the auxiliary water supply tank via the second electric valve (42). The outlet of the second circulating water pump (41) is mechanically connected to the first end of the third electric valve (43). The second end of the third electric valve (43) is mechanically connected to the return water port of the deaerator. The first end of the first electric valve (32) is mechanically connected to the first end of the fourth electric valve (44). The second end of the fourth electric valve (44) is mechanically connected to the inlet of the auxiliary water supply tank.

4. The circulating deoxygenation device according to claim 3, characterized in that, The steps of the control module (5) controlling the operation of the steam control channel (2), the circulating deoxygenation loop (3), and the water exchange loop (4) according to the acquired circulating deoxygenation command and the real-time parameters include: S10. Determine if a deoxygenation cycle command has been received. If so, execute S20. S20, control or keep the steam control channel (2) open, the first circulating water pump (31) open, the first electric valve (32) open, and then execute S30; S30. Determine whether the temperature of the desalinated and deoxygenated water is lower than the set temperature. If yes, return to S20; otherwise, execute S40. S40, control or keep the second circulating water pump (41) on, the first electric valve (32) closed, the fourth electric valve (44) open, the third electric valve (43) open, and then execute S50; S50. Monitor the total flow of desalinated and deoxygenated water through the second circulating water pump (41) during this start-up process. When the total flow of desalinated and deoxygenated water is greater than or equal to the set total, return to S10.

5. The circulating deoxygenation device according to claim 4, characterized in that, The circulating deoxygenation device also includes an exhaust unit (6), which is mechanically connected to the deaerator and electrically connected to the control module (5). The control module (5) is also used to control or keep the exhaust unit (6) open when performing S20, and to control the exhaust unit (6) to close before returning to S10.

6. The circulating deoxygenation device according to claim 4, characterized in that, S20 further includes: controlling the steam control channel (2) and the first circulating water pump (31) to open simultaneously, and controlling the first electric valve (32) to open after a first set time delay; The S40 also includes: first, controlling the second circulating water pump (41) and the third electric valve (43) to open simultaneously, then controlling the first electric valve (32) to close, and then controlling the fourth electric valve (44) to open after a second set time delay.

7. The circulating deoxygenation device according to claim 4, characterized in that, The water exchange loop (4) also includes a heat exchanger (45) and a fifth electric valve (46). The cold side inlet of the heat exchanger (45) is mechanically connected to the second end of the third electric valve (43). The cold side outlet of the heat exchanger (45) is mechanically connected to the return outlet of the deaerator. The second end of the fourth electric valve (44) is mechanically connected to the hot side inlet of the heat exchanger (45). The hot side outlet of the heat exchanger (45) is mechanically connected to the inlet of the auxiliary water supply tank via the fifth electric valve (46). S40 also includes: when controlling the fourth electric valve (44) to open, the fifth electric valve (46) is also controlled to open simultaneously.

8. The circulating deoxygenation device according to claim 7, characterized in that, The real-time parameters also include the level of desalinated and deoxygenated water in the deaerator. The water exchange loop (4) also includes a second regulating valve (47), which is mechanically connected between the second end of the third electric valve (43) and the cold side inlet of the heat exchanger (45), and is electrically connected (47) to the control module (5). S40 further includes: real-time monitoring of the change in the desalination and deoxygenation water level, so as to control the opening of the second regulating valve (47) according to the change in water level, so as to keep the desalination and deoxygenation water level within the set water level range.

9. The circulating deoxygenation device according to claim 4, characterized in that, The real-time parameters also include the steam pressure inside the deaerator; The steam control channel (2) includes a sixth electric valve (21) and a first regulating valve (22). The first end of the sixth electric valve (21) is connected to steam, and the second end of the sixth electric valve (21) is connected to steam via the first regulating valve (22) and mechanically connected to the steam inlet of the deaerator. The sixth electric valve (21) and the first regulating valve (22) are electrically connected to the control module (5). In S20, controlling or keeping the steam control channel (2) open includes: controlling the sixth electric valve (21) to open and monitoring the change of steam pressure in real time, so as to control the opening of the first regulating valve (22) according to the change of pressure, so that the steam pressure is kept within the set pressure range.

10. An auxiliary water supply system, characterized in that, Includes the circulating deoxygenation device as described in any one of claims 1 to 9.

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