Evaporator heat transfer pipe secondary side water supply pipeline water seal monitoring system and monitoring method

Abstract

The invention discloses an evaporator heat transfer pipe secondary side water supply pipeline water seal monitoring system and monitoring method. The water seal monitoring system comprises a differential pressure transmitter, a pressure guide water pipe, a pressure guide air pipe and a monitoring system. The pressure-leading water pipe is connected between a drain valve of the water supply pipeline of the evaporator and the high-pressure side of the differential pressure transmitter, and the pressure-leading air pipe is connected between an exhaust valve of the water supply pipeline of the evaporator and the low-pressure side of the differential pressure transmitter; the monitoring system is connected with the differential pressure transmitter, receives and processes a differential pressure signal sent by the differential pressure transmitter, and obtains the height of the water level in the water supply pipeline; the monitoring system is further connected with the first electromagnetic valve of the water supply system and the second electromagnetic valve on the drainage pipeline, and controls the first electromagnetic valve or the second electromagnetic valve to be opened to fill water or drain water for the water supply pipeline. The water supply pipeline can be subjected to water sealing under the condition that the valve of the water supply system is not disassembled, real-time monitoring is achieved, the sealing water level can be automatically adjusted by controlling the electromagnetic valve, and manpower and material resources are saved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power detection technology, and in particular to a water seal monitoring system and a monitoring method for a water supply pipeline on a secondary side of an evaporator heat transfer tube. Background Art

[0002] The heat transfer tubes of the evaporator of a nuclear power plant serve as the pressure boundary between the primary and secondary circuits, and they carry the dual functions of heat exchange and the second safety barrier. The heat transfer tubes are characterized by dense tube bundles and thin tube walls. Under normal operation and accident conditions, once these thin-walled tubes and welds are damaged, radioactive fission products will leak. Therefore, they must be regularly inspected and maintained to ensure the safe operation of the nuclear power plant.

[0003] According to RSEM1997 (2002 Supplement): ("In-service Inspection Specifications for Mechanical Equipment Components in the Nuclear Island of French Pressurized Water Reactor Nuclear Power Plants"), the steam generator heat transfer tubes must undergo a helium leak test after the primary circuit water pressure test during the ten-year overhaul, in order to discover some minor leaks and defects and conduct pre-processing, thereby achieving the purpose of improving the reliability of the equipment and enhancing the safe operation level of the unit.

[0004] During the helium leak detection of the steam generator heat transfer tube, it is necessary to ensure the sealing of the secondary side of the steam generator. The traditional method is to remove the check valve core of the water supply pipeline and then install a plug in the internal pipe of the valve to achieve the sealing of the water supply pipeline. The above method requires disassembly of the valve, consumes a lot of manpower and material resources, and cannot monitor the pressure on the secondary side in real time. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an improved water seal monitoring system and monitoring method for the secondary side water supply pipeline of the evaporator heat transfer tube.

[0006] The technical solution adopted by the present invention to solve the technical problem is: to provide a water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube, including a differential pressure transmitter, a pressure water pipe, a pressure air pipe, a monitoring system and a water supply system;

[0007] The pressure water pipe is connected between the drain valve of the evaporator water supply pipe and the high-pressure side of the differential pressure transmitter, and the pressure air pipe is connected between the exhaust valve of the evaporator water supply pipe and the low-pressure side of the differential pressure transmitter; the monitoring system is connected to the differential pressure transmitter, receives and processes the pressure difference signal sent by the differential pressure transmitter, and obtains the water level in the water supply pipe;

[0008] The water supply system is connected to the water supply pipe and is used to fill the water supply pipe with water; the monitoring system is also respectively connected to the first solenoid valve of the water supply system and the second solenoid valve on the drainage pipe, and controls the first solenoid valve or the second solenoid valve to open according to the obtained water level height in the water supply pipe, so as to fill the water supply pipe with water or drain the water, so as to control the water level height in the water supply pipe at a predetermined value.

[0009] Preferably, the monitoring system comprises a data acquisition and transmission device, and a remote monitoring device connected to the data acquisition and transmission device via an optical fiber;

[0010] The data acquisition and transmission device is connected to the differential pressure transmitter via a water seal signal transmission cable, collects the differential pressure signal of the differential pressure transmitter and converts it into an optical signal, and transmits it to the remote monitoring device via the optical fiber;

[0011] The remote monitoring device receives and processes the optical signal to obtain the water level in the water supply pipe.

[0012] Preferably, the data acquisition and transmission device comprises a first signal acquisition system and an optical switch;

[0013] The first signal acquisition system acquires the signal transmitted by the differential pressure transmitter and converts the signal into a digital network signal and connects it to the optical switch; the optical switch converts the network signal into an optical signal and transmits it to the remote monitoring device through the optical fiber.

[0014] Preferably, the monitoring system also includes a water level control device, which is connected to the remote monitoring device, and controls the opening of the first solenoid valve or the second solenoid valve according to the obtained water level height in the water supply pipe to fill or drain the water supply pipe to control the water level height at a predetermined value.

[0015] Preferably, the water level control device includes an automatic replenishment and drainage communication unit, an automatic replenishment and drainage data calculation unit, and an automatic replenishment and drainage logic control unit;

[0016] The automatic replenishment and drainage communication unit receives the water level information sent by the remote monitoring device;

[0017] The automatic water replenishment and drainage data calculation unit determines whether water replenishment or drainage is required in the current state according to the water level information, and sends the determination result to the automatic water replenishment and drainage logic control unit;

[0018] The automatic replenishment and drainage logic control unit controls the first solenoid valve or the second solenoid valve to operate according to the judgment result.

[0019] Preferably, the water seal monitoring system for the water supply pipe on the secondary side of the evaporator heat transfer tube further comprises a first quick connector, a first water seal flange, a second quick connector and a second water seal flange;

[0020] The first water seal flange is used to cooperate with the flange on the drain valve, and the first quick connector is fixedly connected to the first water seal flange and is used to cooperate with the pressure water pipe to connect the pressure water pipe to the drain valve;

[0021] The second water seal flange is used to cooperate with the flange on the exhaust valve, and the second quick connector is fixedly connected to the second water seal flange and is used to cooperate with the pressure air pipe to connect the pressure air pipe with the exhaust valve.

[0022] Preferably, the water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube further comprises a pressure gauge installed on the manhole of the evaporator;

[0023] The pressure gauge is connected to the monitoring system to send the detected internal pressure information of the secondary side of the evaporator to the monitoring system.

[0024] Preferably, the water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube is used during the helium leak detection of the evaporator heat transfer tube.

[0025] The present invention also provides a method for monitoring the water seal of a water supply pipe on the secondary side of an evaporator heat transfer tube, using any of the above-mentioned water seal monitoring systems for the water supply pipe on the secondary side of an evaporator heat transfer tube, and the method for monitoring the water seal of a water supply pipe on the secondary side of an evaporator heat transfer tube comprises the following steps:

[0026] S1. Fill water and seal the vertical section of the evaporator water supply pipe connected to the water supply system through the water supply system;

[0027] S2, the differential pressure transmitter measures the pressure difference between the high and low pressure sides through the pressure water pipe and the pressure air pipe connected on both sides of the high and low pressure, and sends the pressure difference signal to the monitoring system;

[0028] S3, the monitoring system receives the pressure difference signal sent by the differential pressure transmitter, and processes it to obtain the water level height in the water supply pipe;

[0029] S4. The monitoring system also compares the obtained water level with a predetermined value, and controls the first solenoid valve of the water supply system or the second solenoid valve on the drainage pipe to operate according to the comparison result, so as to fill or drain the water supply pipe to control the water level within the predetermined value.

[0030] Preferably, the water seal monitoring method for the secondary side water supply pipe of the evaporator heat transfer tube further includes:

[0031] The internal pressure of the evaporator is detected in real time by a pressure gauge, and the detected internal pressure information of the secondary side of the evaporator is sent to the monitoring system.

[0032] The beneficial effects of the present invention are as follows: it is suitable for ensuring the sealing of the secondary water supply pipeline during the helium leak detection of the evaporator heat transfer tube of the nuclear power plant; wherein, the water supply pipeline can be water-sealed without dismantling the valve of the water supply system to achieve real-time monitoring, and the sealing water level can be automatically adjusted by controlling the solenoid valve, saving manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0034] Figure 1 The diagram is a schematic diagram of the connection structure of a water seal monitoring system for a secondary side water supply pipe of an evaporator heat transfer tube according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0036] The water sealing monitoring system for the secondary side water supply pipe of the evaporator heat transfer pipe of the present invention is used to ensure the sealing of the secondary side water supply pipe during the helium leak detection of the evaporator heat transfer pipe of the nuclear power plant.

[0037] like Figure 1 As shown, a water seal monitoring system for a secondary side water supply pipe of an evaporator heat transfer tube according to an embodiment of the present invention may include a water supply system 200, a differential pressure transmitter 10, a pressure water pipe 20, a pressure air pipe 30 and a monitoring system.

[0038] The water supply system 200 is connected to the water supply pipe 110 of the evaporator 100, and is used to fill the water supply pipe 110 with water. The water supply system 200 can be the water supply system originally connected to the secondary side of the evaporator heat transfer tube. The pressure water pipe 20 is connected between the drain valve 101 of the water supply pipe 110 of the evaporator 100 and the high pressure side of the differential pressure transmitter 10, and the pressure air pipe 30 is connected between the exhaust valve 102 of the water supply pipe 110 of the evaporator 100 and the low pressure side of the differential pressure transmitter 10. The monitoring system is connected to the differential pressure transmitter 10, receives and processes the pressure difference signal sent by the differential pressure transmitter 10, and obtains the water level in the water supply pipe 110.

[0039] Preferably, in order to facilitate the disassembly and assembly of the entire water sealing system, the differential pressure transmitter 10 is arranged near the drain valve 101.

[0040] One end of the pressure water pipe 20 is connected to the high-pressure side of the differential pressure transmitter 10, and the other end is connected to the drain valve 101, connecting the high-pressure side of the differential pressure transmitter 10 with the water supply pipe 110. In order to realize the quick connection between the pressure water pipe 20 and the drain valve 101, one end of the pressure water pipe 20 is connected to the flange on the drain valve 101 through the first quick connector 111 and the first water seal flange 112. Specifically, the first quick connector 111 and the first water seal flange 112 are fixedly connected to form a component; the first water seal flange 112 is also used to cooperate with the flange on the drain valve 101, and the two are locked together by fasteners such as bolts. During installation, the first water seal flange 112 with the first quick connector 111 can be docked on the flange on the drain valve 101, and then one end of the pressure water pipe 20 can be plugged into the first quick connector 111 to connect the pressure water pipe 20 to the drain valve 101.

[0041] One end of the pressure-conducting air pipe 30 is connected to the low-pressure side of the differential pressure transmitter 10, and the other end is connected to the exhaust valve 102, connecting the low-pressure side of the differential pressure transmitter 10 with the water supply pipe 110. In order to realize the quick connection between the pressure-conducting air pipe 30 and the exhaust valve 102, one end of the pressure-conducting air pipe 30 is connected to the flange on the drain valve 101 through the second quick connector 121 and the second water seal flange 122. Specifically, the second quick connector 121 and the second water seal flange 122 are fixedly connected to form a component; the second water seal flange 122 is also used to cooperate with the flange on the exhaust valve 102, and the two are locked together by fasteners such as bolts. During installation, the second water seal flange 122 with the second quick connector 121 can be docked on the flange on the exhaust valve 102, and then one end of the pressure-conducting air pipe 30 can be plugged into the second quick connector 121 to connect the pressure-conducting air pipe 30 to the exhaust valve 102.

[0042] The monitoring system may include a data acquisition and transmission device 40 and a remote monitoring device 50 connected to the data acquisition and transmission device 40 via an optical fiber 41 .

[0043] The data acquisition and transmission device 40 can be connected to the differential pressure transmitter 10 through the water seal signal transmission cable 42, collect the differential pressure signal of the differential pressure transmitter 10 and convert it into an optical signal, and transmit it to the remote monitoring device through the optical fiber 41. The remote monitoring device 50 receives and processes the optical signal to obtain the water level in the water supply pipeline.

[0044] In some embodiments, the data acquisition and transmission device 40 further includes a first signal acquisition system and an optical switch. The first signal acquisition system acquires the signal transmitted by the differential pressure transmitter 10 and converts the signal into a digital network signal and connects it to the optical switch; the optical switch converts the network signal into an optical signal and transmits it to the remote monitoring device 50 through the optical fiber 41.

[0045] The first signal acquisition system may be a multi-channel signal acquisition system, so as to have enough channels to receive signals transmitted from different differential pressure transmitters 10 , such as an 8-channel signal acquisition system.

[0046] In some embodiments, the remote monitoring device 50 may include a remote monitoring optical switch, a remote monitoring host, etc. The optical signal converted and sent by the data acquisition and transmission device 40 is transmitted to the remote monitoring optical switch through an optical fiber, and the remote monitoring optical switch converts the optical signal into a network signal and transmits it to the remote monitoring host through a network cable. The water level data (the water level in the water supply pipe) is obtained by running the monitoring software on the remote monitoring host.

[0047] Furthermore, if Figure 1 As shown, the far end of the water supply pipe 110 is usually connected to the water supply system 200, and the water supply system is used to supply water to the secondary side. To this end, the water supply system 200 is connected to the water supply pipe 110 through the first solenoid valve 141, and the on and off is realized by opening and closing the first solenoid valve 141. The drain valve 101 of the water supply pipe 110 is connected to the drain pipe 130 for drainage, and the drain pipe 130 is provided with a second solenoid valve 131 to realize the opening and closing of drainage.

[0048] In order to monitor the filling and drainage, the monitoring system is also connected to the first solenoid valve 141 of the water supply system 200 and the second solenoid valve 131 on the drainage pipe 130, respectively, and controls the first solenoid valve 141 or the second solenoid valve 131 to open according to the water level in the water supply pipe, so as to fill or drain the water supply pipe 110, so as to control the water level at a predetermined value (sealing water level predetermined value). For example, when the water level in the water supply pipe 110 is not enough to meet the water seal, the first solenoid valve 141 is controlled to open, and the water supply system 200 fills the water supply pipe 110 with water until the water level reaches the predetermined value. When the water level in the water supply pipe 110 exceeds the predetermined value, the second solenoid valve 131 is controlled to open for drainage.

[0049] Correspondingly, the monitoring system also includes a water level control device 60, which is connected to the remote monitoring device 50. The water level control device 60 controls the opening of the first solenoid valve 141 or the second solenoid valve 131 according to the obtained water level height in the water supply pipe to fill or drain the water supply pipe 110 to control the water level height at a predetermined value.

[0050] Alternatively, the water level control device 60 may further include an automatic replenishment and drainage communication unit, an automatic replenishment and drainage data calculation unit, and an automatic replenishment and drainage logic control unit.

[0051] The automatic replenishment and drainage communication unit receives the water level information sent by the remote monitoring device 50, and sends the received water level information to the automatic replenishment and drainage data calculation unit. The automatic replenishment and drainage data calculation unit compares the water level information with a predetermined value to determine whether water replenishment or drainage is required in the current state, and sends the judgment result to the automatic replenishment and drainage logic control unit. The automatic replenishment and drainage logic control unit controls the first solenoid valve 141 or the second solenoid valve 131 to operate according to the judgment result, so as to fill water or drain water, etc.

[0052] As needed, in some embodiments, the water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube may also include a pressure gauge 50 installed on the manhole of the evaporator 100. The pressure gauge 50 is used to detect the internal pressure of the secondary side of the evaporator 100, and the internal pressure changes of the secondary side of the evaporator 100 can be obtained in real time.

[0053] During installation, the pressure gauge 80 can be matched with the manhole flange on the manhole through the connecting flange and then fastened together by bolts. A nylon gasket is set between the connecting flange and the manhole flange to protect the sealing surface of the manhole flange.

[0054] The pressure gauge 80 can be connected to the monitoring system via the air pressure signal transmission cable 81, and the detected internal pressure information of the secondary side of the evaporator 100 can be sent to the monitoring system, so as to realize remote monitoring of the pressure change of the secondary side of the evaporator 100. The data acquisition and transmission device 40 of the monitoring system acquires the pressure signal sent by the pressure gauge 80, and then transmits it to the remote monitoring device 50.

[0055] The data acquisition and transmission device 40 further includes a second signal acquisition system. The second signal acquisition system acquires the signal transmitted from the pressure gauge 80 and converts the signal into a digital network signal and connects it to the optical switch; the optical switch converts the network signal into an optical signal and transmits it to the remote monitoring device 50 through the optical fiber 41. The second signal acquisition system can be a multi-channel signal acquisition system with enough channels to receive signals transmitted from different pressure gauges 80, such as a 4-channel signal acquisition system.

[0056] When the water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube of the present invention is in operation, it is used to implement the water seal monitoring method for the secondary side water supply pipe of the evaporator heat transfer tube. Figure 1 The water seal monitoring method of the secondary side water supply pipeline of the evaporator heat transfer tube may include the following steps:

[0057] S0, first connect the water seal monitoring system of the secondary side water supply pipe of the evaporator heat transfer tube to the secondary side of the evaporator 100, the connection status is as follows Figure 1 shown.

[0058] S1. Fill water and seal the vertical section of the water supply pipe 110 of the evaporator 100 connected to the water supply system 200 through the water supply system 200. By filling water into the vertical section, the horizontal section of the rear end of the vertical section connected to the evaporator 100 is water-sealed. At the same time, it is necessary to prevent excessive water from entering the horizontal section. The water filling can be achieved through the water supply system.

[0059] S2. The differential pressure transmitter 10 measures the pressure difference between the high and low pressure sides through the pressure water pipe 20 and the pressure air pipe 30 connected on both sides of the high and low pressure, and sends the pressure difference signal to the monitoring system.

[0060] S3. The monitoring system receives the pressure difference signal sent by the differential pressure transmitter 10 and processes it to obtain the water level height in the water supply pipe.

[0061] Among them, the principle and method of converting the pressure difference into water level height are as follows:

[0062] The differential pressure transmitter 10 is pre-calibrated; the differential pressure transmitter 10 is correctly connected to the water seal monitoring system of the water supply pipe on the secondary side of the evaporator heat transfer tube, and the height h of the differential pressure transmitter 10 from the reference zero position is recorded. As in step S1, after the water supply pipe 110 is filled with water, the pressure difference between the high and low pressure sides of the current differential pressure transmitter 10 is collected as P (unit bar). The height H (unit m) of the water seal water level in the current water supply pipe 110 from the reference zero position is calculated by the following formula, where ρ is the density of water at the current temperature (kg / m 3 ), g is the acceleration due to gravity:

[0063]

[0064] The H obtained above is the water level in the water supply pipe.

[0065] S4. The monitoring system also compares the water level obtained above with a predetermined value, and controls the first solenoid valve 141 of the water supply system or the second solenoid valve 131 on the drainage pipe 130 to operate according to the comparison result, so as to fill or drain the water supply pipe 110, so as to control the water level within the predetermined value and realize automatic adjustment of the water level.

[0066] The monitoring system controls the first solenoid valve 141 or the second solenoid valve 131 as follows:

[0067] The automatic replenishment and drainage communication unit receives the water level information of the water supply pipe 110 in real time;

[0068] The automatic replenishment and drainage logic control unit sends PWM waves with different duty cycles to the solenoid valve drive unit through the calculation results of the automatic replenishment and drainage data calculation unit to realize the switching action of the solenoid valve. When the PWM duty cycle is 0%, the solenoid valve will be closed, and when the PWM duty cycle is 100%, the solenoid valve will be fully open. By adjusting the PWM duty cycle, the flow rate of the solenoid valve can be controlled. The above solenoid valve includes a first solenoid valve 141 and a second solenoid valve 131.

[0069] When automatic water replenishment is required, the automatic water replenishment and drainage logic control unit will control the solenoid valve drive unit to open the first solenoid valve 141 to implement the water filling operation; when automatic water drainage is required, the automatic water replenishment and drainage logic control unit will control the solenoid valve drive unit to open the second solenoid valve 131 to implement the water drainage operation.

[0070] In order to stabilize the water level at a specified height (i.e. a specified value) or to increase or decrease the water level at a certain rate, the automatic water replenishment and drainage data calculation unit has a built-in PID controller. Based on the real-time feedback of the water level and its change information from the system, it calculates the amount of water replenishment or drainage, and sends the calculation result to the automatic water replenishment and drainage logic control unit to control the system to perform water replenishment or drainage operations.

[0071] According to needs, in some embodiments, the water seal monitoring method of the secondary side water supply pipe of the evaporator heat transfer tube of the present invention further includes:

[0072] The internal pressure of the secondary side of the evaporator 100 is detected in real time by the pressure gauge 80, and the detected internal pressure information of the secondary side of the evaporator 100 is sent to the monitoring system for real-time monitoring.

[0073] It can be understood that for the secondary side of the evaporator heat transfer tube, there are usually multiple water supply pipes, some of which are connected to the main water supply system, and some of which are connected to the auxiliary water supply system. The auxiliary water supply system is turned on as needed during normal operation of the evaporator. In the water seal monitoring system and method for the water supply pipes on the secondary side of the evaporator heat transfer tube of the present invention, each water supply pipe is correspondingly configured with a set of differential pressure transmitters, pressure water pipes, and pressure air pipes. The water supply systems that supply water to the water supply pipes have a main water supply system and an auxiliary water supply system, respectively, to ensure that all water supply pipes on the secondary side of the evaporator heat transfer tube are water-sealed. Monitoring.

[0074] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A water seal monitoring system for the secondary side water supply pipe of an evaporator heat transfer tube, characterized in that: Including differential pressure transmitter, pressure water pipe, pressure air pipe, monitoring system and water supply system; The pressure water pipe is connected between the drain valve of the water supply pipe of the evaporator and the high-pressure side of the differential pressure transmitter, and the pressure air pipe is connected between the exhaust valve of the water supply pipe of the evaporator and the low-pressure side of the differential pressure transmitter; the monitoring system is connected to the differential pressure transmitter, receives and processes the pressure difference signal sent by the differential pressure transmitter, and obtains the water level in the water supply pipe; The water supply system is connected to the water supply pipe and is used to fill the water supply pipe with water; the monitoring system is also respectively connected to the first solenoid valve of the water supply system and the second solenoid valve on the drainage pipe, and controls the first solenoid valve or the second solenoid valve to open according to the obtained water level height in the water supply pipe, so as to fill the water supply pipe with water or drain the water, so as to control the water level height in the water supply pipe at a predetermined value.

2. The water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube according to claim 1 is characterized in that: The monitoring system includes a data acquisition and transmission device, and a remote monitoring device connected to the data acquisition and transmission device via an optical fiber; The data acquisition and transmission device is connected to the differential pressure transmitter via a water seal signal transmission cable, collects the differential pressure signal of the differential pressure transmitter and converts it into an optical signal, and transmits it to the remote monitoring device via the optical fiber; The remote monitoring device receives and processes the optical signal to obtain the water level in the water supply pipe.

3. The water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube according to claim 2 is characterized in that: The data acquisition and transmission device includes a first signal acquisition system and an optical switch; The first signal acquisition system acquires the signal transmitted by the differential pressure transmitter and converts the signal into a digital network signal and connects it to the optical switch; the optical switch converts the network signal into an optical signal and transmits it to the remote monitoring device through the optical fiber.

4. The water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube according to claim 2 is characterized in that: The monitoring system also includes a water level control device, which is connected to the remote monitoring device and controls the first solenoid valve or the second solenoid valve to open according to the obtained water level height in the water supply pipe to fill or drain the water supply pipe to control the water level height at a predetermined value.

5. The water seal monitoring system for the secondary side water supply pipeline of the evaporator heat transfer tube according to claim 4 is characterized in that: The water level control device includes an automatic water replenishment and drainage communication unit, an automatic water replenishment and drainage data calculation unit, and an automatic water replenishment and drainage logic control unit; The automatic replenishment and drainage communication unit receives the water level information sent by the remote monitoring device; The automatic water replenishment and drainage data calculation unit determines whether water replenishment or drainage is required in the current state according to the water level information, and sends the determination result to the automatic water replenishment and drainage logic control unit; The automatic replenishment and drainage logic control unit controls the first solenoid valve or the second solenoid valve to operate according to the judgment result.

6. The water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube according to any one of claims 1 to 5, characterized in that: The water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube also includes a first quick connector, a first water seal flange, a second quick connector and a second water seal flange; The first water seal flange is used to cooperate with the flange on the drain valve, and the first quick connector is fixedly connected to the first water seal flange and is used to cooperate with the pressure water pipe to connect the pressure water pipe to the drain valve; The second water seal flange is used to cooperate with the flange on the exhaust valve, and the second quick connector is fixedly connected to the second water seal flange and is used to cooperate with the pressure air pipe to connect the pressure air pipe with the exhaust valve.

7. The water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube according to any one of claims 1 to 5, characterized in that: The water seal monitoring system for the water supply pipe on the secondary side of the evaporator heat transfer tube further comprises a pressure gauge installed on the manhole of the evaporator; The pressure gauge is connected to the monitoring system to send the detected internal pressure information of the secondary side of the evaporator to the monitoring system.

8. The water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube according to any one of claims 1 to 5, characterized in that: The water seal monitoring system for the secondary side water supply pipeline of the evaporator heat transfer tube is used during the helium leak detection of the evaporator heat transfer tube.

9. A method for monitoring water seal of water supply pipe on secondary side of heat transfer tube of evaporator, characterized in that: The water seal monitoring system for the secondary side water supply pipe of the evaporator heat transfer tube according to any one of claims 1 to 8 is adopted, and the water seal monitoring method for the secondary side water supply pipe of the evaporator heat transfer tube comprises the following steps: S1. Fill water and seal the vertical section of the evaporator water supply pipe connected to the water supply system through the water supply system; S2, the differential pressure transmitter measures the pressure difference between the high and low pressure sides through the pressure water pipe and the pressure air pipe connected on both sides of the high and low pressure, and sends the pressure difference signal to the monitoring system; S3, the monitoring system receives the pressure difference signal sent by the differential pressure transmitter, and processes it to obtain the water level height in the water supply pipe; S4. The monitoring system compares the obtained water level with a predetermined value, and controls the first solenoid valve of the water supply system or the second solenoid valve on the drainage pipe to operate according to the comparison result, so as to fill or drain the water supply pipe to control the water level within the predetermined value.

10. The method for monitoring water seal of water supply pipe on secondary side of heat transfer tube of evaporator according to claim 9, characterized in that: The water seal monitoring method for the secondary side water supply pipeline of the evaporator heat transfer tube also includes: The internal pressure of the evaporator is detected in real time by a pressure gauge, and the detected internal pressure information of the secondary side of the evaporator is sent to the monitoring system.

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