Cooling water replenishing device

Abstract

The invention relates to the technical field of high-temperature gas cooled reactor nuclear power plant equipment, and discloses a cooling water replenishing device which is applied to a cooling system of a high-temperature gas cooled reactor nuclear reaction plant and comprises a water replenishing tank, an output pump set, a sensing element and a control assembly. The output water replenishing pressure parameter is monitored through the sensing element arranged on the output pipeline, after the control assembly receives the water replenishing pressure parameter, the output power of the output pump set is adjusted according to the water replenishing pressure parameter, so that the water replenishing pressure is adjusted, and the water outlet end of the output pipeline is communicated with the water consuming system. The control assembly can control the power of the output pump set according to the water replenishing pressure needed by the water using system, so that it is guaranteed that the water replenishing pressure is sufficient, the water replenishing flow meets the needed requirement, the time needed for water replenishing is shortened, and the water replenishing operation difficulty is reduced. And the control system and the sensing element are accurately matched, so that an operator can check the running state in real time through the monitoring system, the maintenance work is greatly simplified, and the service life and the reliability of the equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature gas-cooled reactor nuclear power plant equipment, and in particular to a cooling water replenishment device. Background Art

[0002] The nuclear island water system of the High-Temperature Gas-Cooled Reactor (HTGR) Demonstration Project involves multiple important cooling systems, including the equipment cooling water system, the residual heat removal system, the reactor pressure vessel support cooling system, and the nuclear island chilled water system. All of the above cooling water systems are closed-loop systems whose main function is to maintain the stable operation of each system and ensure the safety of the equipment. However, during normal operation, due to factors such as slight leaks in the system and chemical sampling, the system pressure and expansion tank liquid level may decrease. In particular, the residual heat removal system and the reactor pressure vessel support cooling system are designed as dedicated safety facilities for the HTGR and are required to maintain specific pressures and liquid levels during operation to ensure the safety of the nuclear island.

[0003] Due to the different on-site location heights of different cooling systems in the nuclear island, as well as the differences in the operating pressures of each system, the pressure standards for water replenishment requirements are also different. In this context, the existing equipment cooling water system water replenishment device has a low outlet pressure of its water replenishment pump (about 0.5Mpa), which is only suitable for equipment cooling water systems. For the residual heat removal system and the reactor pressure vessel support cooling system, since these systems maintain a relatively high operating pressure during normal operation, the existing water replenishment device cannot directly meet their water replenishment needs. Therefore, the current solution uses the equipment cooling water system dosing pump to replenish water to the above two systems of the high-temperature gas-cooled reactor. However, since the flow rate of the dosing pump is very small, the water replenishment time is long and the process is complicated, resulting in a time-consuming and labor-intensive water replenishment operation. Summary of the Invention

[0004] In view of this, the present invention provides a cooling water replenishment device to solve the problems in the prior art of using a dosing pump of the equipment cooling water system to replenish water to the cooling system of a high-temperature gas-cooled reactor, such as small flow rate, long replenishment time and difficult replenishment operation.

[0005] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0006] The present invention provides a cooling water make-up device, which is applied to the cooling system of a high-temperature gas-cooled reactor nuclear reactor plant, and includes: a make-up water tank, an output pump group, a sensing element and a control component; the make-up water tank is suitable for storing cooling water; the water inlet end of the output pump group is connected with the water outlet of the make-up water tank, and the water outlet end of the output pump group is connected with a water use system through an output pipe, and the output pump group is suitable for transporting the cooling water in the make-up water tank to the water use system; the sensing element is arranged on the output pipe, and the sensing element is used to monitor the make-up water pressure parameter; the control component is communicatively connected with the sensing element to be suitable for receiving the make-up water pressure parameter, and the control component controls the operating power of the output pump group according to the make-up water pressure parameter.

[0007] It has the following advantages:

[0008] This application monitors the output water supply pressure parameters by setting a sensing element on the output pipe. After the control component receives the water supply pressure parameters, it adjusts the output power of the output pump group according to the water supply pressure parameters, thereby adjusting the water supply pressure. The water outlet end of the output pipe is connected to the water use system. The control component can control the power of the output pump group according to the water supply pressure required by the water use system, thereby ensuring that the water supply pressure is sufficient and the water supply flow meets the required requirements, so as to shorten the time required for water supply and reduce the difficulty of water supply operation. The automated control function of the control component reduces the burden of manual operation and improves the reliability and safety of operation. The real-time data feedback of the sensing element ensures that the control component can respond quickly and reduces the occurrence of human errors. The precise coordination of the control system and the sensing element allows operators to view the operating status in real time through the monitoring system, which greatly simplifies maintenance work and improves the service life and reliability of the equipment.

[0009] According to some embodiments of the present invention, a first water inlet is provided on the top of the water replenishment tank, and the first water inlet is connected to the desalted water equipment. The desalted water equipment is suitable for providing a cooling water source to the water replenishment tank through the first water inlet box, and a water replenishment valve is provided on the pipe connecting the desalted water equipment and the first water inlet.

[0010] According to some embodiments of the present invention, a pressure relief valve communicating with the external atmosphere is further provided on the top of the water replenishment tank.

[0011] According to some embodiments of the present invention, a liquid level monitoring component is provided in the water replenishment tank, and the liquid level monitoring component is suitable for monitoring the liquid level height parameters in the water replenishment tank. The liquid level monitoring component and the water replenishment valve are both communicatively connected with the control component, and the control component is suitable for receiving the liquid level height parameters issued by the liquid level monitoring component to control the opening and closing of the water replenishment valve.

[0012] According to some embodiments of the present invention, the output pump group includes a first water supply pump and a second water supply pump, the first water supply pump and the second water supply pump are arranged in parallel, and the water outlet ends of the first water supply pump and the second water supply pump are both provided with a check valve.

[0013] According to some embodiments of the present invention, a first inspection valve is provided between the water inlet end of the first water supply pump and the water supply tank, and a second inspection valve is provided between the water inlet end of the second water supply pump and the water supply tank; a third inspection valve is provided at the water outlet end of the first water supply pump, and a fourth inspection valve is provided at the water outlet end of the second water supply pump, and the third inspection valve and the fourth inspection valve are located at the rear end of the check valve.

[0014] According to some embodiments of the present invention, the output pipeline includes a mainstream pipeline and multiple branch pipelines, the sensing element is arranged on the mainstream pipeline, and the multiple branch pipelines are arranged in parallel. The multiple branch pipelines are respectively connected to multiple water-using equipment, and a first valve body is provided on the branch pipeline near the inlet of the water-using equipment.

[0015] According to some embodiments of the present invention, the cooling water replenishment device also includes a loop pipe, a second water inlet is provided on the upper part of the water replenishment tank, one end of the loop pipe is connected to the mainstream pipeline, and the other end of the loop pipe is connected to the second water inlet, and an overflow valve is provided on the loop pipe.

[0016] According to some embodiments of the present invention, a second valve body is provided on the loop pipeline, and the second valve body is arranged in parallel with the overflow valve.

[0017] According to some embodiments of the present invention, the control component includes a first frequency converter, a second frequency converter and a frequency conversion controller, the first frequency converter is electrically connected to the first water supply pump, the second frequency converter is electrically connected to the second water supply pump, the first frequency converter and the second frequency converter are both communicatively connected to the frequency conversion controller, the sensing element is a pressure detection element, and the frequency conversion controller controls the operation of the first frequency converter and the second frequency converter according to the water supply pressure parameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the structural connection of a cooling water replenishment device provided in some embodiments of the present invention;

[0020] Figure 2 This is a schematic diagram of the structural connection of the output pump group provided in some embodiments of the present invention.

[0021] Description of reference numerals:

[0022] 1. Make-up water tank; 11. Pressure relief valve; 12. Liquid level monitoring component; 2. Output pump group; 21. First make-up water pump; 22. Second make-up water pump; 23. First service valve; 24. Second service valve; 25. Third service valve; 26. Fourth service valve; 27. Check valve; 3. Sensing element; 4. Control component; 41. Frequency converter; 42. First frequency converter; 43. Second frequency converter; 5. Desalted water equipment; 6. Make-up water valve; 7. Overflow valve; 8. First valve body; 9. Second valve body; 10. Water-using equipment. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Reference Figure 1 As shown, the present invention provides a cooling water make-up device, which is applied to the cooling system of a high-temperature gas-cooled reactor nuclear reactor plant, comprising: a make-up water tank 1, an output pump group 2, a sensing element 3 and a control component 4; the make-up water tank 1 is suitable for storing cooling water; the water inlet end of the output pump group 2 is connected to the water outlet of the make-up water tank 1, and the water outlet end of the output pump group 2 is connected to the water system through an output pipe, and the output pump group 2 is suitable for transporting the cooling water in the make-up water tank 1 to the water system; the sensing element 3 is provided on the output pipe, and the sensing element 3 is used to monitor the make-up water pressure parameter; the control component 4 is communicatively connected to the sensing element 3 to be suitable for receiving the make-up water pressure parameter, and the control component 4 controls the operating power of the output pump group 2 according to the make-up water pressure parameter.

[0028] Specifically, the present application monitors the output water supply pressure parameters by means of a sensing element 3 provided on the output pipe. After receiving the water supply pressure parameters, the control component 4 adjusts the output power of the output pump group 2 according to the water supply pressure parameters, thereby adjusting the water supply pressure. The water outlet end of the output pipe is connected to the water supply system. The control component 4 can control the power of the output pump group 2 according to the water supply pressure required by the water supply system, thereby ensuring that the water supply pressure is sufficient and the water supply flow meets the required requirements, thereby shortening the time required for water supply and reducing the difficulty of water supply operation. The automated control function of the control component 4 reduces the burden of manual operation and improves the reliability and safety of operation. The real-time data feedback of the sensing element 3 ensures that the control component 4 can respond quickly and reduce the occurrence of human errors. The precise coordination of the control system and the sensing element 3 allows operators to view the operating status in real time through the monitoring system, greatly simplifying maintenance work and improving the service life and reliability of the equipment.

[0029] It can be understood that the water-using equipment 10 includes a waste heat removal system, a reactor pressure vessel support cooling system, and a nuclear island chilled water system.

[0030] In some embodiments of the present invention, a first water inlet is provided on the top of the water replenishment tank 1, and the first water inlet is connected to the desalted water equipment 5. The desalted water equipment 5 is suitable for providing a cooling water source through the first water inlet box water replenishment tank 1, and a water replenishment valve 6 is provided on the pipe connecting the desalted water equipment 5 and the first water inlet.

[0031] Specifically, the first water inlet of the water supply tank 1 is connected to the desalted water device 5, so that the desalted water is used as cooling water to cool the water-using device 10 to improve energy efficiency. The water supply valve 6 is set to control the water supply of the cooling water.

[0032] In some embodiments of the present invention, a pressure relief valve 11 communicating with the external atmosphere is further provided on the top of the water replenishment tank 1 .

[0033] Specifically, during the cooling water supply and replenishment process, in order to ensure the air pressure balance in the water replenishment tank 1, a pressure relief valve 11 is set at the top of the water replenishment tank 1. The pressure relief valve 11 connects the internal cavity of the water replenishment tank 1 with the external atmosphere, thereby ensuring the normal operation of the cooling water supply and replenishment.

[0034] In some embodiments of the present invention, a liquid level monitoring component 12 is provided in the water supply tank 1, and the liquid level monitoring component 12 is suitable for monitoring the liquid level height parameters in the water supply tank 1. The liquid level monitoring component 12 and the water supply valve 6 are both communicatively connected with the control component 4, and the control component 4 is suitable for receiving the liquid level height parameters issued by the liquid level monitoring component 12 to control the opening and closing of the water supply valve 6.

[0035] Specifically, the liquid level monitoring component 12 is used to monitor the liquid level parameter in the water supply tank 1. When the liquid level parameter is lower than a preset first liquid level, the control component 4 controls the water supply valve 6 to open. When the liquid level parameter is higher than a preset second liquid level, the control component 4 controls the water supply valve 6 to close, thereby ensuring that the liquid level in the water supply tank 1 is in a steady state, ensuring the normal supply of cooling water, and avoiding insufficient cooling water in the water supply tank 1, which may lead to the inability to cool the water system, or avoid excessive overflow of cooling water in the water supply tank 1, which may cause damage to the equipment. It is understandable that the water supply valve 6 is an electric valve, which is in communication with the control component 4. The control component 4 controls the opening of the water supply valve 6 to replenish the cooling water source.

[0036] It is understandable that when the liquid level of the water supply tank 1 decreases, the control component 4 can automatically stop the pump group 2 and send out an alarm to remind the staff.

[0037] Reference Figure 2 As shown, in some embodiments of the present invention, the output pump group 2 includes a first water supply pump 21 and a second water supply pump 22, the first water supply pump 21 and the second water supply pump 22 are arranged in parallel, and the water outlet ends of the first water supply pump 21 and the second water supply pump 22 are both provided with a check valve 27.

[0038] Specifically, the output pump assembly 2 includes a first makeup water pump 21 and a second makeup water pump 22. The first makeup water pump 21 and the second makeup water pump 22 are arranged in parallel to improve reliability. If the first makeup water pump 21 fails, the second makeup water pump 22 can ensure that the system does not shut down, thereby ensuring water replenishment efficiency. Check valves 27 are installed at the water outlets of the first makeup water pump 21 and the second makeup water pump 22 to prevent cooling water from flowing back and causing damage to the first makeup water pump 21 or the second makeup water pump 22.

[0039] In some embodiments of the present invention, a first inspection valve 23 is provided between the water inlet end of the first water supply pump 21 and the water supply tank 1, and a second inspection valve 24 is provided between the water inlet end of the second water supply pump 22 and the water supply tank 1; a third inspection valve 25 is provided at the water outlet end of the first water supply pump 21, and a fourth inspection valve 26 is provided at the water outlet end of the second water supply pump 22, and the third inspection valve 25 and the fourth inspection valve 26 are located at the rear end of the check valve 27.

[0040] Specifically, a first service valve 23 is provided at the water inlet of the first make-up water pump 21, a third service valve 25 is provided at the water outlet of the first make-up water pump 21, a second service valve 24 is provided at the water inlet of the second make-up water pump 22, and a fourth service valve 26 is provided at the water outlet of the second make-up water pump 22. When the first make-up water pump 21 and / or the second make-up water pump 22 fails, the first service valve 23 and the second service valve 24 can be closed to facilitate maintenance and repair of the first make-up water pump 21 and the second make-up water pump 22. When the output pipeline and / or the sensing element 3 leaks or is damaged, the third service valve 25 and the fourth service valve 26 can be closed to facilitate maintenance and repair of the output pipeline and / or the sensing element 3. The provision of the first service valve 23, the second service valve 24, the third service valve 25, and the fourth service valve 26 can improve maintenance efficiency and reduce maintenance costs.

[0041] In some embodiments of the present invention, the output pipeline includes a mainstream pipeline and multiple branch pipelines, the sensing element 3 is arranged on the mainstream pipeline, and the multiple branch pipelines are arranged in parallel. The multiple branch pipelines are respectively connected to multiple water-using equipment 10, and a first valve body 8 is provided on the branch pipeline and near the inlet of the water-using equipment 10.

[0042] Specifically, by setting up multiple branch pipes, cooling water supply to multiple water-using equipment 10 is achieved, and the cooling water supply efficiency is improved. The first valve body 8 is set to regulate the flow rate and is convenient for maintenance.

[0043] In some embodiments of the present invention, the cooling water replenishment device also includes a loop pipe, a second water inlet is provided on the upper part of the water replenishment tank 1, one end of the loop pipe is connected to the mainstream pipeline, and the other end of the loop pipe is connected to the second water inlet, and an overflow valve 7 is provided on the loop pipe.

[0044] Specifically, the setting of the loop channel can prevent the water supply pressure of the mainstream pipeline from being too high. An overflow valve 7 is set on the loop pipeline. When the water supply pressure reaches the pressure parameter set by the overflow valve 7, the cooling water flows back to the water supply tank 1 through the loop pipeline, thereby preventing the system from being overpressurized.

[0045] In some embodiments of the present invention, a second valve body 9 is provided on the loop pipeline, and the second valve body 9 is arranged in parallel with the overflow valve 7 .

[0046] It can be understood that a second valve body 9 is provided on the loop pipeline, and the second valve body 9 is provided in parallel with the overflow valve 7. When chemicals are added to the water supply tank 1, the second valve body 9 is opened, a single water supply pump is started, that is, the first water supply pump 21 or the second water supply pump 22 is started, and the first valve body 8 is closed, so that the cooling water circulates in the mainstream pipeline, the loop pipeline and the water supply tank 1. The setting of the second valve body 9 can make the chemicals evenly mixed in a short time.

[0047] In some embodiments of the present invention, the control component 4 includes a first frequency converter 42, a second frequency converter 43 and a frequency conversion controller 41. The first frequency converter 42 is electrically connected to the first water supply pump 21, the second frequency converter 43 is electrically connected to the second water supply pump 22, and the first frequency converter 42 and the second frequency converter 43 are both communicatively connected to the frequency conversion controller 41. The sensing element 3 is a pressure detection component, and the frequency conversion controller 41 controls the operation of the first frequency converter 42 and the second frequency converter 43 according to the water supply pressure parameters.

[0048] Specifically, the first frequency converter 42 is used to control the operating speed of the first water supply pump 21 , and the second frequency converter 43 is used to control the operating speed of the second water supply pump 22 .

[0049] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cooling water replenishment device, used in the cooling system of a high-temperature gas-cooled reactor nuclear reactor plant, characterized in that: include: A water supply tank (1), wherein the water supply tank (1) is suitable for storing cooling water; an output pump group (2), wherein the water inlet end of the output pump group (2) is connected to the water outlet of the water supply tank (1), and the water outlet end of the output pump group (2) is connected to the water system through an output pipe, and the output pump group (2) is suitable for delivering the cooling water in the water supply tank (1) to the water system; A sensing element (3), the sensing element (3) being arranged on the output pipe and being used for monitoring a water supply pressure parameter; A control component (4) is connected in communication with the sensing element (3) to receive the water replenishment pressure parameter, and the control component (4) controls the operating power of the output pump group (2) according to the water replenishment pressure parameter.

2. The cooling water replenishing device according to claim 1, characterized in that: A first water inlet is provided on the top of the water supply tank (1), and the first water inlet is connected to the desalted water device (5). The desalted water device (5) is suitable for providing a cooling water source to the water supply tank (1) through the first water inlet box. A water supply valve (6) is provided on the pipeline connecting the desalted water device (5) and the first water inlet.

3. The cooling water replenishing device according to claim 2, characterized in that: The top of the water replenishment tank (1) is also provided with a pressure relief valve (11) communicating with the external atmosphere.

4. The cooling water replenishing device according to claim 3, characterized in that: A liquid level monitoring component (12) is provided in the water supply tank (1), and the liquid level monitoring component (12) is suitable for monitoring a liquid level height parameter in the water supply tank (1). The liquid level monitoring component (12) and the water supply valve (6) are both communicatively connected with the control component (4), and the control component (4) is suitable for receiving the liquid level height parameter sent by the liquid level monitoring component (12) to control the opening and closing of the water supply valve (6).

5. The cooling water replenishing device according to claim 1, characterized in that: The output pump group (2) comprises a first water supply pump (21) and a second water supply pump (22), wherein the first water supply pump (21) and the second water supply pump (22) are arranged in parallel, and the water outlet ends of the first water supply pump (21) and the second water supply pump (22) are both provided with a check valve (27).

6. The cooling water replenishing device according to claim 5, characterized in that: A first inspection valve (23) is provided between the water inlet end of the first water supply pump (21) and the water supply tank (1), and a second inspection valve (24) is provided between the water inlet end of the second water supply pump (22) and the water supply tank (1); a third inspection valve (25) is provided at the water outlet end of the first water supply pump (21), and a fourth inspection valve (26) is provided at the water outlet end of the second water supply pump (22); the third inspection valve (25) and the fourth inspection valve (26) are located at the rear end of the check valve (27).

7. The cooling water replenishing device according to claim 1, characterized in that: The output pipeline includes a main pipeline and multiple branch pipelines, the sensing element (3) is arranged on the main pipeline, the multiple branch pipelines are arranged in parallel, and the multiple branch pipelines are respectively connected to multiple water-using equipment (10), and a first valve body (8) is provided on the branch pipeline near the inlet of the water-using equipment (10).

8. The cooling water replenishing device according to claim 7, characterized in that: It also includes a loop pipe, a second water inlet is provided on the upper part of the water supply tank (1), one end of the loop pipe is connected to the main pipeline, and the other end of the loop pipe is connected to the second water inlet, and an overflow valve (7) is provided on the loop pipe.

9. The cooling water replenishing device according to claim 8, characterized in that: A second valve body (9) is provided on the loop pipeline, and the second valve body (9) is arranged in parallel with the overflow valve (7).

10. The cooling water replenishing device according to claim 5, characterized in that: The control component (4) includes a first frequency converter (42), a second frequency converter (43) and a frequency conversion controller (41), wherein the first frequency converter (42) is electrically connected to the first water supply pump (21), and the second frequency converter (43) is electrically connected to the second water supply pump (22). The first frequency converter (42) and the second frequency converter (43) are both communicatively connected to the frequency conversion controller (41), the sensing element (3) is a pressure detection element, and the frequency conversion controller (41) controls the operation of the first frequency converter (42) and the second frequency converter (43) according to the water supply pressure parameter.

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