Secondary side passive residual heat removal system operating characteristics experimental device and method

Abstract

The present invention relates to an experimental device and method for the operating characteristics of a secondary side passive waste heat removal system, comprising a steam generator and a steam-water separator which are separately arranged; the steam generator comprises a water supply inlet and a steam outlet, and the steam-water separator is connected to the steam generator; the steam generator is connected to a condenser arranged in an air cooling tower through a steam pipe, and the steam-water separator is arranged between the steam generator and the condenser; the condensate outlet of the condenser is connected to a water supply module, and the water supply module is connected to the water supply inlet of the steam generator through a water inlet pipe; the water supply module comprises a water supply tank and a plurality of water supply pipes, and each water supply pipe is provided with a water supply isolation valve; the experimental device also comprises a measurement module for measuring the data parameters of each measuring point on the experimental device. The present invention can carry out an operating characteristics experiment of a passive waste heat removal system under different water supply tank connection modes; solve the problem that the steam-water separator cannot be replaced separately, and reduce the manufacturing cost of the experimental device.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power plant system equipment safety, and in particular to an operating characteristic experimental device and method for a secondary side passive residual heat removal system. Background Art

[0002] The secondary side passive residual heat removal system is an important safety system for removing residual heat from a nuclear power plant after an accident. It absorbs the heat of the primary circuit in the steam generator and transfers the heat to the atmosphere through natural circulation. In order to establish natural circulation, a water supply tank is usually set in the secondary side passive residual heat removal system. The water supply tank can be connected in parallel or in series with the condenser. The two different methods have different effects on the operating characteristics of the system.

[0003] In the current existing technology, one experimental device can only carry out experiments under one water supply tank connection method, and a single experimental device cannot meet the requirements of experiments under different connection methods of the water supply tank;

[0004] Moreover, the steam-water separator of a general steam generator simulation body cannot be replaced alone. If it is necessary to carry out an impact experiment of different forms of steam-water separators, the entire steam generator simulation body needs to be replaced, which is costly and difficult. Summary of the invention

[0005] The technical problem to be solved by the present invention is that, in view of the defects of the prior art, a secondary side passive residual heat removal system operation characteristic experiment device and method are provided, which can realize the operation characteristic experiment of the secondary side passive residual heat removal system under different connection modes of the make-up water tank.

[0006] The technical solution adopted by the present invention to solve the technical problem is: constructing an experimental device for the operating characteristics of a secondary side passive waste heat removal system, including a steam generator and a steam-water separator which are separately arranged;

[0007] The steam generator includes a feedwater inlet and a steam outlet, which are used to simulate the heat transfer tube of the steam generator of a nuclear power plant; the steam-water separator is connected to the steam generator, which is used to simulate the steam-water separator and dryer in the steam generator of the nuclear power plant;

[0008] The steam generator is connected to a condenser arranged in an air cooling tower through a steam pipeline, and the steam-water separator is arranged between the steam generator and the condenser;

[0009] The condensate outlet of the condenser is connected to a water replenishment module, and the condensate condensed by the condenser is recycled into the water replenishment module, and the water replenishment module is connected to the water supply inlet of the steam generator through a water inlet pipe; the water replenishment module includes a water replenishment tank and a plurality of water replenishment pipes, and each of the water replenishment pipes is provided with a water replenishment isolation valve; by controlling each water replenishment isolation valve in the water replenishment module to switch the connection mode of the water replenishment tank, the experimental working conditions under different connection modes of the water replenishment tank are completed;

[0010] The secondary side passive waste heat removal system operation characteristic experimental device also includes a measurement module; the measurement module is used to measure the data parameters of each measurement point on the experimental device.

[0011] Preferably, the steam outlet of the steam generator is connected to the steam inlet of the steam-water separator through a first steam pipe, and the steam exhaust port of the steam-water separator is connected to a condenser arranged in an air cooling tower through a second steam pipe.

[0012] Preferably, the secondary side passive waste heat removal system operation characteristic experimental device further includes a safety valve for preventing the experimental pressure from exceeding the design pressure of the experimental device, and the safety valve is arranged on a third steam pipe connected to the first steam pipe.

[0013] Preferably, the secondary side passive waste heat removal system operation characteristic experimental device further comprises a muffler, and the muffler is arranged on one end of the third steam pipe away from the steam generator.

[0014] Preferably, the steam exhaust port of the steam-water separator is connected to the water inlet of the water supply tank through a first water supply pipe, the condensate outlet of the condenser is connected to the water inlet of the water supply tank through a second water supply pipe, the second water supply pipe is connected to the water inlet pipe through a third water supply pipe, and the water outlet of the water supply tank is connected to the water inlet pipe through a fourth water supply pipe;

[0015] The first water replenishment pipeline is provided with a first water replenishment isolation valve, the second water replenishment pipeline is provided with a second water replenishment isolation valve, the third water replenishment pipeline is provided with a third water replenishment isolation valve, and the fourth water replenishment pipeline is provided with a fourth water replenishment isolation valve. By controlling the first water replenishment isolation valve, the second water replenishment isolation valve, the third water replenishment isolation valve and the fourth water replenishment isolation valve, the switching of different connection modes of the water replenishment tank is achieved.

[0016] Preferably, the measuring module comprises a pressure sensor, a thermocouple, a flow meter and a differential pressure sensor;

[0017] The pressure sensors are respectively arranged on the steam pipe and the water inlet pipe, the thermocouples are respectively arranged on the steam pipe, the water inlet pipe, the air cooling tower and the water make-up tank, the flow meters are respectively arranged on the water make-up pipe and the water inlet pipe, and the differential pressure sensors are respectively arranged on the steam-water separator and the water make-up tank.

[0018] Preferably, the pressure sensor and the thermocouple are provided at one end of the first steam pipe close to the steam outlet; the pressure sensor, the thermocouple and the flow meter are provided at one end of the water inlet pipe close to the water supply inlet; and the flow meter is provided on both the third water supply pipe and the fourth water supply pipe.

[0019] Preferably, when it is necessary to carry out a water supply tank series experimental condition, the steam outlet of the steam-water separator is connected to the condenser, the second water supply pipeline, the water supply tank and the fourth water supply pipeline in sequence to the water supply inlet of the steam generator;

[0020] When it is necessary to carry out a water supply tank parallel test condition, the steam outlet of the steam-water separator is connected to the first water supply pipe to the water supply tank in one way; and is connected to the condenser and the third water supply pipe in turn to the water supply inlet of the steam generator in another way;

[0021] When it is necessary to carry out experimental conditions without a water supply tank, the steam outlet of the steam-water separator is connected to the condenser and the third water supply pipeline all the way to the water supply inlet of the steam generator.

[0022] Preferably, a first isolation valve is provided between the exhaust port of the steam-water separator and the condenser; and a second isolation valve is provided between the water replenishment module and the water supply inlet of the steam generator.

[0023] Preferably, a check valve is provided on the water inlet pipe, and the check valve is located between the water replenishment module and the second isolation valve.

[0024] Preferably, the secondary side passive waste heat removal system operation characteristics experimental device also includes a steam module and a main steam isolation valve. The steam module is connected to the second steam pipe through a fourth steam pipe to receive steam from the exhaust port of the steam-water separator. The main steam isolation valve is arranged on the fourth steam pipe.

[0025] Preferably, the secondary side passive waste heat removal system operation characteristics experimental device also includes a water supply module and a water supply isolation valve. The water supply module is connected to the water inlet pipe through an auxiliary pipe to replenish water to the steam generator, and the water supply isolation valve is arranged on the auxiliary pipe.

[0026] Preferably, the steam-water separator is a cylindrical body, and includes a plurality of groups of stationary blades.

[0027] Preferably, the secondary side passive waste heat removal system operation characteristic experimental device also includes a drain tank and a drain valve, the drain tank is connected to the drain port of the steam-water separator through a drain pipe, and the drain valve is arranged on the drain pipe.

[0028] The present invention also constructs an experimental method for operating characteristics of a secondary side passive residual heat removal system, comprising the following steps:

[0029] S1. Establish an experimental device for the operation characteristics of the secondary side passive residual heat removal system;

[0030] S2. According to different experimental working conditions, the water replenishment isolation valves in the water replenishment module of the device are controlled to switch the connection mode of the water replenishment tank to complete the experimental preparatory debugging;

[0031] S3. Control the remaining corresponding isolation valves in the device, and measure the data parameters of each measuring point on the device through the measurement module.

[0032] Preferably, the step S2 comprises:

[0033] S21. When it is necessary to carry out the water supply tank series test condition, only the second water supply tank isolation valve arranged on the second water supply pipeline and the fourth water tank isolation valve arranged on the fourth water supply pipeline are opened;

[0034] S22. When it is necessary to carry out the water supply tank parallel test condition, only the first water supply tank isolation valve arranged on the first water supply pipeline and the third water tank isolation valve arranged on the third water supply pipeline are opened;

[0035] S23. When it is necessary to carry out experimental conditions without a water supply tank, only the third water tank isolation valve arranged on the third water supply pipeline is opened.

[0036] The implementation of the present invention has the following beneficial effects: the present invention can carry out an experiment on the operating characteristics of a passive waste heat removal system under different water supply tank connection modes; by separately arranging a steam-water separator, the problem that the steam-water separator cannot be replaced separately is solved, thereby reducing the manufacturing cost of the experimental device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0038] Figure 1 It is a structural schematic diagram of the operating characteristics experimental device of the secondary side passive waste heat removal system of the present invention;

[0039] Figure 2It is a schematic diagram of the experimental method for the operating characteristics of the secondary side passive waste heat removal system of the present invention. DETAILED DESCRIPTION

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0041] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0043] like Figure 1 As shown, the present invention constructs an experimental device for operating characteristics of a secondary side passive waste heat removal system, comprising a steam generator 1 and a steam-water separator 2 which are separately arranged;

[0044] The steam generator 1 includes a feedwater inlet and a steam outlet. The steam generator 1 uses electric heating to heat saturated water into saturated steam, which is used to simulate the heat transfer pipe of the steam generator 1 of a nuclear power plant. The steam-water separator 2 can be a cylindrical body, and the steam-water separator 2 includes a plurality of groups of stationary blades 21. The steam-water separator 2 is connected to the steam generator 1 and is used to simulate the steam-water separator and dryer in the steam generator of a nuclear power plant. Through the steam generator 1 and the steam-water separator 2 in the present invention, the steam generator of a nuclear power plant can be simulated to provide a steam source for the operation characteristic experiment of the secondary side passive residual heat removal system.

[0045] The steam generator 1 is connected to the condenser 32 disposed in the air cooling tower 31 through a steam pipeline, and the steam-water separator 2 is disposed between the steam generator 1 and the condenser 32. The condenser 32 is mainly used to condense saturated steam into saturated water, the inside of the tube is the steam side, and the outside of the tube is the air side; the air cooling tower 31 is used to absorb the heat transferred in the condenser 32.

[0046] The condenser 32 is connected to a water supply module 4. The condensed water condensed by the condenser 32 is recycled into the water supply module 4. The water supply module 4 is connected to the water supply inlet of the steam generator 1 through the water inlet pipe 200. The water supply module 4 includes a water supply tank 41 and a plurality of water supply pipes. The water supply tank 41 is used to maintain the minimum water volume required for the operation of the secondary side passive residual heat removal system. A water supply isolation valve is provided on each water supply pipe. By controlling the opening and closing of each water supply isolation valve in the water supply module to switch the connection mode of the water supply tank, the experimental working conditions under different connection modes of the water supply tank are completed.

[0047] The secondary side passive waste heat removal system operation characteristics experimental device also includes a measurement module; the experimental device includes multiple measuring points, wherein the multiple measuring points include pressure measuring points, temperature measuring points, flow measuring points and water level measuring points; the measurement module is mainly used to measure the data parameters of each measuring point on the experimental device.

[0048] Furthermore, the steam outlet of the steam generator 1 is connected to the steam inlet of the steam-water separator 2 through the first steam pipe 101, and the steam outlet of the steam-water separator 2 is connected to the condenser 32 arranged in the air cooling tower 31 through the second steam pipe 102. Furthermore, a first isolation valve 1021 is provided between the steam outlet of the steam-water separator 2 and the condenser 32; a second isolation valve 201 is provided between the water supply module 4 and the water supply inlet of the steam generator 1. During normal operation, the isolation valve is isolated from the steam generator 1, and the valve is opened only when it is started. In terms of the flow direction of steam and water, the inlet and outlet are for the non-active waste heat removal system. The inlet corresponds to the flow to the condenser, and the outlet corresponds to the flow out of the condenser. Therefore, the first isolation valve 1021 can be called the inlet isolation valve, and the second isolation valve 201 can be called the outlet isolation valve.

[0049] Furthermore, a check valve 202 is provided on the water inlet pipe 200 to prevent water in the circuit from flowing back, and the check valve 202 is located between the water replenishment module 4 and the second isolation valve 201 .

[0050] Furthermore, the secondary side passive waste heat removal system operation characteristic experimental device also includes a steam module 71 and a main steam isolation valve 72. The steam module 71 is connected to the second steam pipe 102 through a fourth steam pipe 104 to receive steam from the exhaust port of the steam-water separator 2. The main steam isolation valve 72 is arranged on the fourth steam pipe 104.

[0051] Furthermore, the secondary side passive waste heat removal system operation characteristic experimental device also includes a water supply module 81 and a water supply isolation valve 82. The water supply module 81 is connected to the water inlet pipe 200 through an auxiliary pipe 300 to replenish water to the steam generator 1. The water supply isolation valve 82 is arranged on the auxiliary pipe 300. When the condensate water supply is insufficient, the water supply tank 41 and / or the water supply module 81 replenishes water to the steam generator 1.

[0052] Furthermore, the secondary side non-passive waste heat removal system operation characteristic experimental device also includes a safety valve 51 for preventing the experimental pressure from exceeding the design pressure of the experimental device, and the safety valve 51 is arranged on the third steam pipe 103 connected to the first steam pipe 101. Furthermore, the secondary side non-passive waste heat removal system operation characteristic experimental device also includes a muffler 52 for preventing noise, and the muffler 52 is arranged on the third steam pipe 103 and away from the end of the steam generator 1. The safety valve 51 and the muffler 52 are mainly used to prevent the experimental pressure from exceeding the design pressure of the experimental device. At the same time, by adjusting the opening pressure of the safety valve 51, the impact of the opening of the safety valve on the operation of the secondary side non-passive waste heat removal system can be simulated.

[0053] Furthermore, the exhaust port of the steam-water separator 2 is connected to the water inlet of the make-up water tank 41 through a first make-up water pipe 42, the condensate outlet of the condenser 32 is connected to the water inlet of the make-up water tank 41 through a second make-up water pipe 43, the second make-up water pipe 43 is connected to the water inlet pipe 200 through a third make-up water pipe 44, and the water outlet of the make-up water tank 41 is connected to the water inlet pipe 200 through a fourth make-up water pipe 45; a first make-up water isolation valve 421 is provided on the first make-up water pipe 42, a second make-up water isolation valve 431 is provided on the second make-up water pipe 43, a third make-up water isolation valve 441 is provided on the third make-up water pipe 44, and a fourth make-up water isolation valve 451 is provided on the fourth make-up water pipe 45. By controlling the first make-up water isolation valve 421, the second make-up water isolation valve 431, the third make-up water isolation valve 441 and the fourth make-up water isolation valve 451, the switching of different connection modes of the make-up water tank is realized.

[0054] Further, the measurement module includes a pressure sensor 61, a thermocouple 62, a flow meter 63 and a differential pressure sensor 64;

[0055] The pressure sensor 61 is respectively arranged on the steam pipe and the water inlet pipe 200, the thermocouple 62 is respectively arranged on the steam pipe, the water inlet pipe 200, the air cooling tower 31 and the water make-up tank 41, the flow meter 63 is respectively arranged on the water make-up pipe and the water inlet pipe 200, and the pressure difference sensor 64 is respectively arranged on the steam-water separator 2 and the water make-up tank 41.

[0056] Furthermore, the pressure measuring points of the experimental device include: the steam outlet of the steam generator 1 and the water supply inlet of the steam generator 1; the temperature measuring points include the outlet of the steam generator 1, the make-up water tank 41, the inlet of the steam generator 1, the inlet of the air-cooling tower 31 and the outlet of the air-cooling tower 31; the water level measuring points include the steam-water separator 2 and the make-up water tank 41; the flow measuring points include the inlet of the steam generator 1, the make-up water pipeline of the make-up water tank 41 and the bypass pipeline of the make-up water tank 41. Specifically, a differential pressure sensor 64 is provided in the steam-water separator 2 to measure the water level in the steam-water separator 2; a thermocouple 62 is provided at the inlet and outlet of the air cooling tower 31 to measure the temperature in the air cooling tower 31; a differential pressure sensor 64 and a thermocouple 62 are provided in the water supply tank 41 to measure the water level and temperature in the water supply tank 41; a pressure sensor 61 and a thermocouple 62 are provided at one end of the first steam pipe 101 near the steam outlet to measure the pressure and temperature in the steam pipe; on the water inlet pipe 200, specifically, the water supply inlet of the steam generator 1 and the thermocouple 62 are connected. A pressure sensor 61, a thermocouple 62 and a flow meter 63 are provided on a section connected to the auxiliary pipeline 300 to measure the pressure, temperature and flow in the water inlet pipeline 200; flow meters 63 are provided on the third water supply pipeline 44 and the fourth water supply pipeline 45 to measure the flow in the water supply pipeline; specifically, a flow meter 63 is provided on a section from the third water supply isolation valve 441 to the check valve 202, and a flow meter 63 is also provided on a section from the water outlet of the water supply tank 41 to the fourth water supply isolation valve 451, and the flow meter 63 can be a venturi flow meter. In the present invention, the instruments in the measurement module are not limited to the above-mentioned measuring instruments, but can also be replaced by other types of instruments.

[0057] Furthermore, different connection modes of the water supply tank 41 are realized by controlling the relevant isolation valves. When the water supply tank series connection experimental condition is required, the steam outlet of the steam-water separator 2 is connected to the condenser 32, the second water supply pipeline 43, the water supply tank 41 and the fourth water supply pipeline 45 in sequence to the water supply inlet of the steam generator 1;

[0058] When it is necessary to carry out the water supply tank parallel test condition, the steam outlet of the steam-water separator 2 is connected to the first water supply pipe 42 to the water supply tank 41; the other way is connected to the condenser 32 and the third water supply pipe 44 in sequence to the water supply inlet of the steam generator 1;

[0059] When it is necessary to carry out experimental working conditions without a water supply tank, the steam outlet of the steam-water separator 2 is connected to the condenser 32 and the third water supply pipeline 44 to the water supply inlet of the steam generator 1.

[0060] Furthermore, the secondary side passive waste heat removal system operation characteristic experimental device also includes a drain tank 91 and a drain valve 92. The drain tank 91 is connected to the drain port of the steam-water separator 2 through a drain pipe. The drain valve 92 is arranged on the drain pipe to adjust the water level of the steam-water separator 2.

[0061] like Figure 2 As shown, the present invention also constructs an experimental method for operating characteristics of a secondary side passive residual heat removal system, comprising the following steps:

[0062] S1. Establish the above secondary side passive waste heat removal system operation characteristics experimental device;

[0063] S2. According to different experimental working conditions, the connection mode of the water supply tank is switched by controlling the water supply isolation valves in the water supply module 4 of the control device to complete the experimental preparatory debugging; this step is the experimental preparatory debugging before the formal experiment. Before the experiment, close the first isolation valve 1021 and the second isolation valve 201 of the secondary side passive residual heat removal device, close and open the first water supply isolation valve 421, the second water supply isolation valve 431, the third water supply isolation valve 441 and the fourth water supply isolation valve 451 as needed, and close the steam trap 92; under normal circumstances, the four water supply isolation valves are initially closed by default. Adjust the water level of the water supply tank 41 to the preset water level of the experiment. When the water supply module 81 and the steam module 71 are ready, open the water supply isolation valve 82 and the main steam isolation valve 72, and adjust the pressure and temperature of the steam generator 1 to the target state required by the experiment by adjusting the steam and water supply flow. Monitor the water level in the steam-water separator 2, and adjust the water level of the steam-water separator 2 through the steam trap 92 when necessary.

[0064] S3. Control the remaining corresponding isolation valves in the device and measure the data parameters of each measuring point on the device through the measuring module.

[0065] Furthermore, step S2 specifically includes:

[0066] S21. When it is necessary to carry out the water supply tank series experimental condition, in the experimental pre-preparation step, only the second water supply tank 41 isolation valve arranged on the second water supply pipeline 43 and the fourth water tank isolation valve arranged on the fourth water supply pipeline 45 are opened; the first water supply tank 41 isolation valve arranged on the first water supply pipeline 42 and the third water tank isolation valve arranged on the third water supply pipeline 44 remain closed;

[0067] S22, when it is necessary to carry out the water supply tank parallel experimental working condition, only the first water supply tank 41 isolation valve arranged on the first water supply pipeline 42 and the third water tank isolation valve arranged on the third water supply pipeline 44 are opened; the second water supply tank 41 isolation valve arranged on the second water supply pipeline 43 remains closed;

[0068] S23. When it is necessary to carry out experimental conditions without a water supply tank, only the third water tank isolation valve arranged on the third water supply pipe 44 is opened; the first water supply tank 41 isolation valve arranged on the first water supply pipe 42, the second water tank isolation valve arranged on the second water supply pipe 43 remain closed, and the fourth water tank isolation valve arranged on the fourth water supply pipe 45 remains closed.

[0069] Furthermore, step S3 specifically includes the following contents, which are divided into four experimental situations and described respectively below.

[0070] (1) When it is necessary to carry out the experimental working condition of the series connection of the water supply tank, execute step S21 to complete the experimental preparation. At the beginning of the experiment, close the main steam isolation valve 72, open the first isolation valve 1021 of the secondary side passive residual heat removal system, and after a delay, open the second isolation valve 201. During the experiment, the water level of the steam-water separator 2 is monitored by the measurement module. When the water level of the steam-water separator 2 exceeds the monitoring value, open the steam trap 92 to adjust the water level of the steam-water separator 2.

[0071] In this type of experiment, when the isolation valve of the secondary side passive waste heat removal system is opened, the water in the make-up water tank enters the steam generator under the action of gravity, is heated into steam, and enters the steam-water separator. The droplets carried in the steam are separated from the steam, and the steam enters the condenser, transfers heat to the air through the heat transfer pipe, and the condensed water enters the make-up water tank through the pipe, forming a closed circulation loop of condenser-make-up water tank-steam generator-steam-water separator-condenser.

[0072] (2) When it is necessary to carry out the experimental working condition of the water supply tank in parallel, execute step S22 to complete the experimental preparation. At the beginning of the experiment, close the main steam isolation valve 72, open the first isolation valve 1021 and the fourth water supply isolation valve 451 of the secondary side passive residual heat removal system, and open the second isolation valve 201 after a delay. During the experiment, the water level of the steam-water separator 2 is monitored by the measurement module. When the water level of the steam-water separator 2 exceeds the monitoring value, open the steam trap 92 to adjust the water level of the steam-water separator 2.

[0073] In this type of experiment, when the isolation valve of the secondary side passive waste heat removal system is opened, the top space of the make-up water tank is connected to the steam pipe through a pipe, and the pressure of the make-up water tank reaches equilibrium with the pressure of the steam pipe. The water in the make-up water tank enters the steam generator under the action of gravity, is heated into steam, and enters the steam-water separator. The liquid droplets carried in the steam are separated from the steam, and the steam enters the condenser, transfers heat to the air through the heat transfer tube, and the condensed water enters the steam generator through the pipe, forming a closed circulation loop of condenser-steam generator-steam separator-condenser.

[0074] (3) When it is necessary to carry out the experimental working condition without the makeup water tank, execute step S23 to complete the experimental preparation. At the beginning of the experiment, close the main steam isolation valve 72, open the first isolation valve 1021 of the secondary side passive residual heat removal system, and after a delay, open the second isolation valve 201. During the experiment, the water level of the steam-water separator 2 is monitored by the measurement module. When the water level of the steam-water separator 2 exceeds the monitoring value, open the steam trap 92 to adjust the water level of the steam-water separator 2.

[0075] In this type of experiment, when the isolation valve of the secondary side passive waste heat removal system is opened, the water in the condenser and the pipeline enters the steam generator under the action of gravity, is heated into steam, and enters the steam-water separator. The droplets carried in the steam are separated from the steam, and the steam enters the condenser and transfers heat to the air through the heat transfer pipe. The condensed water re-enters the steam generator through the pipeline, forming a closed circulation loop of condenser-steam generator-steam separator-condenser.

[0076] (4) According to the experimental needs, by adjusting the opening pressure of the safety valve 51, a research experiment on the influence of the opening of the safety valve on the operating characteristics of the secondary side passive residual heat removal system can be carried out. The experimental steps are as follows:

[0077] In the experimental preparation step, the opening pressure of the safety valve 51 is adjusted to the required set value in advance, and the first water supply isolation valve 421, the second water supply isolation valve 431, the third water supply isolation valve 441 and the fourth water supply isolation valve 451 are closed and opened as needed according to the experimental needs.

[0078] At the beginning of the experiment, the main steam isolation valve 72 is closed, the first isolation valve 1021 of the secondary side passive residual heat removal system is opened, and after a delay, the second isolation valve 201 is opened. When the pressure of the steam generator 1 is higher than the opening pressure of the safety valve 51, the safety valve 51 is opened.

[0079] In this type of experiment, when the isolation valve of the secondary side passive waste heat removal system is opened, if the steam generator pressure is higher than the safety valve opening pressure, part of the steam generated in the steam generator is directly discharged into the atmosphere through the safety valve, and the remaining steam enters the condenser through the pipeline. As the experiment progresses, when the steam generator pressure drops below the safety valve opening pressure, the safety valve closes, and the steam generated in the steam generator enters the condenser through the pipeline.

[0080] The implementation of the present invention can carry out an experiment on the operating characteristics of a passive waste heat removal system under different water supply tank connection modes; by separately arranging a steam-water separator, the problem that the steam-water separator cannot be replaced separately is solved, thereby reducing the manufacturing cost of the experimental device.

[0081] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A secondary side passive residual heat removal system operating characteristics experimental device, characterized in that: It comprises a steam generator (1) and a steam-water separator (2) which are arranged separately; The steam generator (1) comprises a feed water inlet and a steam outlet, and is used to simulate a heat transfer tube of a steam generator in a nuclear power plant; the steam-water separator (2) is connected to the steam generator (1), and is used to simulate a steam-water separator and a dryer in a steam generator in a nuclear power plant; The steam generator (1) is connected to a condenser (32) arranged in an air cooling tower (31) through a steam pipeline, and the steam-water separator (2) is arranged between the steam generator (1) and the condenser (32); The condenser (32) is connected to a water replenishment module (4), and condensed water condensed by the condenser (32) is recycled into the water replenishment module (4). The water replenishment module (4) is connected to the water supply inlet of the steam generator (1) via a water inlet pipe (200); the water replenishment module (4) comprises a water replenishment tank (41) and a plurality of water replenishment pipes, each of which is provided with a water replenishment isolation valve; and the connection mode of the water replenishment tank (41) is switched by controlling the water replenishment isolation valves in the water replenishment module (4), thereby completing experimental working conditions under different connection modes of the water replenishment tank (41); The secondary side passive residual heat removal system operation characteristic experimental device also includes a measurement module; the measurement module is used to measure the data parameters of each measurement point on the experimental device; The steam outlet of the steam generator (1) is connected to the steam inlet of the steam-water separator (2) via a first steam pipe (101), and the steam outlet of the steam-water separator (2) is connected to the condenser (32) arranged in the air cooling tower (31) via a second steam pipe (102).

2. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 1 is characterized in that: The secondary side passive residual heat removal system operating characteristics experimental device further comprises a safety valve (51) for preventing the experimental pressure from exceeding the design pressure of the experimental device, wherein the safety valve (51) is arranged on a third steam pipe (103) connected to the first steam pipe (101).

3. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 2 is characterized in that: The secondary side passive residual heat removal system operation characteristic experimental device further comprises a muffler (52), wherein the muffler (52) is arranged on an end of the third steam pipe (103) away from the steam generator (1).

4. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 1 is characterized in that: The steam exhaust port of the steam-water separator (2) is connected to the water inlet of the water supply tank (41) via a first water supply pipe (42), the condensate outlet of the condenser (32) is connected to the water inlet of the water supply tank (41) via a second water supply pipe (43), the second water supply pipe (43) is connected to the water inlet pipe (200) via a third water supply pipe (44), and the water outlet of the water supply tank (41) is connected to the water inlet pipe (200) via a fourth water supply pipe (45); The first water supply pipeline (42) is provided with a first water supply isolation valve (421), the second water supply pipeline (43) is provided with a second water supply isolation valve (431), the third water supply pipeline (44) is provided with a third water supply isolation valve (441), and the fourth water supply pipeline (45) is provided with a fourth water supply isolation valve (451). By controlling the first water supply isolation valve (421), the second water supply isolation valve (431), the third water supply isolation valve (441) and the fourth water supply isolation valve (451), switching of different connection modes of the water supply tank (41) is achieved.

5. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 4 is characterized in that: The measurement module comprises a pressure sensor (61), a thermocouple (62), a flow meter (63) and a differential pressure sensor (64); The pressure sensor (61) is respectively arranged on the steam pipe and the water inlet pipe (200); the thermocouple (62) is respectively arranged on the steam pipe, the water inlet pipe (200), the air cooling tower (31) and the water supply tank (41); the flow meter (63) is respectively arranged on the water supply pipe and the water inlet pipe (200); and the differential pressure sensor (64) is respectively arranged on the steam-water separator (2) and the water supply tank (41).

6. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 5 is characterized in that: The pressure sensor (61) and the thermocouple (62) are provided at one end of the first steam pipe (101) close to the steam outlet; the pressure sensor (61), the thermocouple (62) and the flow meter (63) are provided at one end of the water inlet pipe (200) close to the water supply inlet; and the flow meter (63) is provided on both the third water supply pipe (44) and the fourth water supply pipe (45).

7. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 6 is characterized in that: When it is necessary to carry out a water supply tank (41) series experimental condition, the steam outlet of the steam-water separator (2) is connected in sequence to the condenser (32), the second water supply pipeline (43), the water supply tank (41) and the fourth water supply pipeline (45) to the water supply inlet of the steam generator (1); When it is necessary to carry out a parallel experimental working condition of the water supply tank (41), the steam outlet of the steam-water separator (2) is connected to the first water supply pipe (42) to the water supply tank (41) through one path; and is connected to the condenser (32) and the third water supply pipe (44) in sequence to the water supply inlet of the steam generator (1) through the other path; When it is necessary to carry out an experimental working condition without a water supply tank (41), the steam outlet of the steam-water separator (2) is connected all the way to the condenser (32) and the third water supply pipeline (44) to the water supply inlet of the steam generator (1).

8. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 1 is characterized in that: A first isolation valve (1021) is provided between the steam exhaust port of the steam-water separator (2) and the condenser (32); and a second isolation valve (201) is provided between the water replenishment module (4) and the water supply inlet of the steam generator (1).

9. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 8, characterized in that: The water inlet pipeline (200) is provided with a check valve (202), and the check valve (202) is located between the water replenishment module (4) and the second isolation valve (201).

10. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 1, characterized in that: The secondary side passive waste heat removal system operation characteristic experimental device further comprises a steam module (71) and a main steam isolation valve (72); the steam module (71) is connected to the second steam pipeline (102) via a fourth steam pipeline (104) to receive steam from the exhaust port of the steam-water separator (2); and the main steam isolation valve (72) is arranged on the fourth steam pipeline (104).

11. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 1, characterized in that: The secondary side passive waste heat removal system operation characteristic experimental device further comprises a water supply module (81) and a water supply isolation valve (82); the water supply module (81) is connected to the water inlet pipe (200) via an auxiliary pipe (300) to replenish water to the steam generator (1); and the water supply isolation valve (82) is arranged on the auxiliary pipe (300).

12. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 1, characterized in that: The steam-water separator (2) is a cylindrical body, and comprises a plurality of groups of stationary blades (21) therein.

13. The secondary side passive residual heat removal system operation characteristic experimental device according to claim 1, characterized in that: The secondary side passive waste heat removal system operation characteristic experimental device further comprises a drain tank (91) and a drain valve (92); the drain tank (91) is connected to the drain port of the steam-water separator (2) via a drain pipe; and the drain valve (92) is arranged on the drain pipe.

14. A method for testing the operating characteristics of a secondary side passive residual heat removal system, characterized in that: The following steps are involved: S1. Establishing the operating characteristics experimental device of the secondary side passive residual heat removal system as claimed in claim 4; S2. According to different experimental working conditions, the water replenishment isolation valves in the water replenishment module of the device are controlled to switch the connection mode of the water replenishment tank to complete the experimental preparatory debugging; S3. Control the remaining corresponding isolation valves in the device, and measure the data parameters of each measuring point on the device through the measurement module.

15. The secondary side passive residual heat removal system operation characteristic test method according to claim 14, characterized in that: The step S2 comprises: S21. When it is necessary to carry out the water supply tank series test condition, only the second water supply tank isolation valve arranged on the second water supply pipeline and the fourth water tank isolation valve arranged on the fourth water supply pipeline are opened; S22. When it is necessary to carry out the water supply tank parallel test condition, only the first water supply tank isolation valve arranged on the first water supply pipeline and the third water tank isolation valve arranged on the third water supply pipeline are opened; S23. When it is necessary to carry out an experimental condition without a water supply tank, only the third water tank isolation valve arranged on the third water supply pipeline is opened.

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