Anti-backflow condensate water hammer test device under sloshing working condition

Abstract

The application discloses a condensation water hammer test device under a sloshing condition of anti-backflow, relates to the field of heat transfer and fluid mechanics, and is characterized by comprising a main loop steam pipeline, an anti-backflow device and a test section pipeline, wherein the anti-backflow device comprises a steam injection channel, a subcooled water pipeline, a baffle and a torsional spring; the main loop steam pipeline is connected with a steam generator and the steam injection channel; the test section pipeline is connected with the subcooled water pipeline; the baffle is installed at one end of the steam injection channel connected with the subcooled water pipeline; and the baffle and the steam injection channel are connected through the torsional spring. The application can conduct condensation water hammer test on a test section pipeline with a full-scale pipe diameter under a six-degree-of-freedom sloshing condition, and can prevent cold water from flowing back into a steam system due to pipeline swinging and tilting during the test, so that the safety and stability of the test process are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat transfer and fluid mechanics, in particular to a backflow prevention condensation water hammer test device under sloshing condition. BACKGROUND

[0002] Gas-liquid direct contact condensation has high efficient heat and mass transfer characteristics, but the condensation water hammer problem caused by this phenomenon is widespread in nuclear power systems, steam power systems and ocean passive residual heat removal systems and other energy power devices. The water hammer impact caused by this phenomenon can seriously damage the pipeline and related equipment and affect the safe operation of the system. Research on the condensation water hammer phenomenon and its load characteristics is of great significance to the safe operation of ocean nuclear power systems and has been widely concerned by domestic and foreign research institutions and scholars. Ocean nuclear power devices are affected by wind, waves, swells and other external environments to cause sloshing motion, which affects the gas-liquid two-phase flow heat transfer characteristics in the pipe and significantly affects the formation and load characteristics of condensation water hammer, resulting in more complex condensation water hammer phenomenon in ocean nuclear power devices than in land environment. Therefore, it is necessary to carry out condensation water hammer test under sloshing condition and master the condensation water hammer characteristics under ocean sloshing condition.

[0003] The condensation water hammer test under sloshing condition faces the following problems and challenges: 1. It is unacceptable from the safety and economy point of view to carry out condensation water hammer test under sloshing condition of full-scale system; 2. Condensation water hammer test under sloshing condition of reduced scale system requires proportional reduction of pipe diameter, but the formation and load characteristics of condensation water hammer are closely related to the size of pipe diameter, so the pipe diameter cannot be reduced; 3. Under sloshing condition, with the tilting of the pipeline, cold water in the pipeline and external cold source will flow into the steam system, seriously affecting the safety of the system.

[0004] Based on the above considerations, it is necessary to invent a test device for condensation water hammer test under sloshing condition to meet the following requirements of condensation water hammer test: 1. It can carry out condensation water hammer test under full-scale pipe diameter; 2. It can simulate the inlet and outlet boundary condition characteristics of actual system condensation water hammer; 3. It can prevent cold water from flowing into the steam system due to the tilting of the pipeline.

[0005] Therefore, the skilled in the art is committed to developing a backflow prevention condensation water hammer test device under sloshing condition to solve the above problems and realize the condensation water hammer test under ocean sloshing condition. SUMMARY

[0006] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is how to design a test device for simulating condensate hammer testing under marine swaying conditions, which can successfully simulate the inlet and outlet boundary conditions of condensate hammer in marine nuclear power plants and conduct condensate hammer testing on test sections of pipes with actual diameter under six-degree-of-freedom swaying conditions, and prevent cold water backflow into the steam system due to pipe swaying and tilting during the test, thus ensuring the safety and stability of the test process.

[0007] To achieve the above objectives, the present invention provides a condensate hammer test device under sloshing conditions with backflow prevention, characterized in that it includes a main circuit steam pipe, an anti-backflow device, and a test section pipe. The anti-backflow device includes a steam injection channel, a subcooled water pipe, a baffle, and a torsion spring. The main circuit steam pipe is connected to a steam generator and the steam injection channel. The test section pipe is connected to the subcooled water pipe. The steam injection channel is connected to the subcooled water pipe. The baffle is installed at the end of the steam injection channel connected to the subcooled water pipe. The baffle and the steam injection channel are connected by the torsion spring.

[0008] Furthermore, the anti-backflow device is fixed on a six-degree-of-freedom swaying platform, the main circuit steam pipeline is connected to the anti-backflow device through a first flexible hose, the anti-backflow device is connected to the test section pipeline through a flange, the test section pipeline is connected to the water tank through a second flexible hose, and the water tank is connected to the chiller.

[0009] Furthermore, the anti-backflow device also includes a cavity shell, which is a cube structure made of five stainless steel square plates and one acrylic square plate. The steam injection channel is fixedly connected to the top plate of the cavity shell by bolts, and the steam injection channel is made of polycarbonate material.

[0010] Furthermore, the first hose is connected to the outer shell of the cavity via a flange. The first hose is a PTFE-lined metal hose used to inject high-temperature steam into the steam injection channel.

[0011] Furthermore, the main circuit steam pipeline is composed of a first vortex flow meter, a first thermocouple, a first static pressure sensor, a gas-liquid separator, a first ball valve, a first electric regulating valve, a mass flow meter, a second thermocouple, a second static pressure sensor, a second vortex flow meter, a second ball valve, a third thermocouple, and a third static pressure sensor connected in sequence. The first vortex flow meter is connected to the steam generator, and the third static pressure sensor is connected to the anti-backflow device.

[0012] Further, a bypass branch is further included, the bypass branch is connected on the pipeline between the first vortex flowmeter and the first thermocouple, the bypass branch includes a first branch and a second branch, the first branch includes a second electric regulating valve and a fourth ball valve, and the second branch includes a fifth ball valve and an air compressor.

[0013] Further, a terminal branch is further included, the terminal branch is connected on the pipeline between the second vortex flowmeter and the second ball valve, the terminal branch includes a third ball valve, a fourth thermocouple and a fourth static pressure sensor.

[0014] Further, the backflow prevention device further includes a weight, the weight is installed on the baffle, and the rigidity of the torsional spring and the mass of the weight satisfy that the restoring moment of the torsional spring suffered by the baffle before the experiment starts is equal to the external moment applied by the weight, and the baffle is in a closed state.

[0015] Further, the inclination angle of the steam injection channel is 135 degrees.

[0016] Further, the baffle and the weight are made of stainless steel, and the baffle and the weight are connected in a welding mode.

[0017] Under the offshore sloshing condition, the pipeline swing inclination can cause the cold water to flow back into the steam system, the backflow prevention device is designed at the front end of the test section pipeline, the mechanical relationship among the baffle, the weight and the torsional spring in the backflow prevention device is utilized, when the pipeline is inclined upward and the supercooled water flows back, the baffle is closed, for other no backflow conditions, the baffle is opened, and the steam is normally injected, the cold water backflow into the steam system can be prevented, the uncontrolled condensation water hammer can be prevented, and the safe and stable operation of the test system can be ensured.

[0018] Meanwhile, in order to simulate the inlet boundary condition characteristics of the actual system occurring condensation water hammer, the steam is not directly injected into the test section, but first enters the supercooled water pipeline communicated with the test section pipeline through the steam injection pipeline in the backflow prevention device, the closed cavity in the device is high-temperature gas-liquid two-phase flow, and the inlet boundary is simulated. The multifunctional principle is adopted, the backflow prevention device can be used as the inlet boundary of the high-temperature gas-liquid two-phase flow for simulating the actual condensation water hammer, the steam enters the test section pipeline through the backflow prevention device, the interference of the external environment can be avoided, and the test can be carried out in any season.

[0019] In order to ensure that the steam flow, temperature and pressure entering the test section meet the test condition requirements, the bypass branch and the terminal branch are arranged to cooperate with the main loop to adjust the flow, temperature and pressure parameters of the steam, the steam physical properties are adjusted before the experiment starts, the steam physical property parameters can be accurately adjusted before the test, the steam physical property adjustment after the test starts is avoided, and the scientificity of the test is ensured.

[0020] The present application has the following advantages:

[0021] 1. The end branch and bypass branch of the present application can cooperate with the main loop to adjust the temperature, pressure and flow of steam, so as to ensure that the steam injected into the test section meets the requirements of the test working condition.

[0022] 2. The anti-backflow device and the main loop pipeline of the present application are connected through a hose and fixed on the sloshing table, the test section pipeline is connected with the anti-backflow device through a flange and connected with the water tank through a hose, so that the six-degree-of-freedom sloshing movement of the test section pipeline can be realized.

[0023] 3. The anti-backflow device of the present application adopts a spring-connected baffle and a steam injection channel, when there is no steam injection, the baffle is in a closed state due to the balance between the restoring torque of the torsion spring and the external torque exerted by the weight, and relies on the structure to limit the baffle, so that the subcooled water cannot enter the steam injection channel.

[0024] 4. The steam injection channel of the anti-backflow device of the present application has an inclination angle of 135°, so that the injection steam speed has a component perpendicular to the baffle and a component parallel to the subcooled water pipeline, wherein the speed component perpendicular to the baffle is used to provide the pressure for opening the baffle, and the parallel speed component ensures that there is a horizontal speed towards the test section when the steam is injected, so that the injected steam flows to the condensation water hammer load test section, and ensures that the condensation water hammer phenomenon does not occur inside the cavity.

[0025] 5. The cavity of the anti-backflow device of the present application has certain heat preservation performance, so that the gas-liquid two-phase flow in the cavity is in a high temperature state, and the actual high temperature gas-liquid two-phase flow inlet condition can be simulated.

[0026] 6. The anti-backflow device of the present application can make the baffle close when cold water backflow occurs during the test, so as to avoid the cold water from entering the steam pipeline, and can make the baffle open when there is no cold water backflow, so as to ensure the safe and stable operation of the test system.

[0027] 7. The opening and closing of the baffle of the anti-backflow device of the present application is realized by the mechanical relationship between the external torque M1 exerted by the weight gravity and the steam pressure and the restoring torque M2 of the torsion spring, and does not rely on electronic equipment, so that the structure always ensures stable function even in a complex high temperature gas-liquid two-phase flow working environment.

[0028] The concept, specific structure and technical effects of the present application will be further described below with reference to the drawings, so as to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1It is a kind of anti-refluxing under the sloshing condition of condensate water hammer test device for steam injection condensate water hammer experiment method principle diagram of a preferred embodiment of the present application;

[0030] Figure 2 It is the structure section view schematic diagram of the anti-reflux device of a preferred embodiment of the present application a kind of anti-refluxing under the sloshing condition of condensate water hammer test device;

[0031] Figure 3 It is the structure side view of the anti-reflux device of a preferred embodiment of the present application a kind of anti-refluxing under the sloshing condition of condensate water hammer test device;

[0032] Figure 4 It is the working principle schematic diagram of the anti-reflux device of a preferred embodiment of the present application a kind of anti-refluxing under the sloshing condition of condensate water hammer test device;

[0033] Figure 5 It is the cavity top plate structure schematic diagram of the anti-reflux device of a preferred embodiment of the present application a kind of anti-refluxing under the sloshing condition of condensate water hammer test device;

[0034] Figure 6 It is the supercooled water pipeline structure schematic diagram of the anti-reflux device of a preferred embodiment of the present application a kind of anti-refluxing under the sloshing condition of condensate water hammer test device;

[0035] Figure 7 It is the steam injection passage structure schematic diagram of the anti-reflux device of a preferred embodiment of the present application a kind of anti-refluxing under the sloshing condition of condensate water hammer test device;

[0036] Figure 8 It is the baffle structure schematic diagram of the anti-reflux device of a preferred embodiment of the present application a kind of anti-refluxing under the sloshing condition of condensate water hammer test device;

[0037] Among them, 91-first hose, 92-connecting flange, 93-cavity shell, 94-bolt, 95-steam injection channel, 96-subcooled water pipe, 97-baffle, 98-torsion spring, 99-weight, 1-steam generator, 201-first vortex flow meter, 301-first thermocouple, 401-first static pressure sensor, 5-gas-liquid separator, 601-first ball valve, 701-first electric regulating valve, 8-mass flow meter, 302-second thermocouple, 402-first... 202-Second vortex flow meter, 602-Second ball valve, 303-Third thermocouple, 403-Third static pressure sensor, 603-Third ball valve, 304-Fourth thermocouple, 404-Fourth static pressure sensor, 9-Anti-backflow device, 10-Six-degree-of-freedom swaying table, 11-Test section pipeline, 12-Second hose, 13-Water tank, 14-Chiller, 702-Second electric regulating valve, 604-Fourth ball valve, 605-Fifth ball valve, 15-Air compressor. Detailed Implementation

[0038] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0039] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0040] like Figure 1As shown, this invention provides a condensate hammer test device under sloshing conditions with backflow prevention. The piping system includes a main circuit steam pipe, a bypass branch, an end branch, and a test section pipe. One end of the main circuit steam pipe is connected to a steam generator 1, and the other end is connected to an anti-backflow device 9, which is used to adjust the steam generated by the steam generator 1 according to the test conditions, so that steam with a specified temperature, pressure, and mass flow rate is injected into the test section pipe 11. The main circuit steam pipeline includes: a first vortex flow meter 201 to measure the steam flow rate at the steam generator outlet; a first thermocouple 301 and a first static pressure sensor 401 to measure the steam pressure and temperature at the steam generator outlet; a gas-liquid separator 5 equipped with a sight glass to ensure the steam in the main circuit is dry and to observe the separated water level in real time; a first ball valve 601, a normally open valve, used to control the opening and closing of the main circuit steam pipeline; a first electric regulating valve 701 to adjust the valve opening according to the output signals of the mass flow meter 8 and the second vortex flow meter 202, with the aim of obtaining the steam flow rate specified under experimental conditions; a second ball valve 602 to open after the steam pressure, flow rate, and temperature in the main circuit steam pipeline have been regulated; and a third thermocouple 303 and a third static pressure sensor 403 to measure the steam temperature and pressure injected into the anti-backflow device 9.

[0041] The bypass branch, in conjunction with the main circuit steam pipeline, regulates the steam flow rate entering the test section pipeline 11. Two branches are set up, each equipped with an air compressor 15 and a second electric regulating valve 702. Before the experiment, the fifth ball valve 605 is opened and the fourth ball valve 604 is closed. The air compressor 15 is used to purge the pipeline system to remove residual condensate. During the experiment, the fourth ball valve 604 is opened and the fifth ball valve 605 is closed. The second electric regulating valve 702 is used to fine-tune the steam flow rate of the main circuit.

[0042] The terminal branch, in conjunction with the main circuit steam pipeline, regulates the temperature and pressure of the steam entering the test section pipeline 11. Located before the second ball valve 602, it is equipped with a third ball valve 603, a fourth thermocouple 304, and a fourth static pressure sensor 404. These components are installed symmetrically with the second ball valve 602, the third thermocouple 303, and the third static pressure sensor 403. During the experiment, the third ball valve 603 is opened first, and the second ball valve 602 is closed. Once the readings of the fourth thermocouple 304 and the fourth static pressure sensor 404 are stable at the required test conditions, the third ball valve 603 is closed, and the fourth ball valve 604 is opened, ensuring that the steam properties injected into the test section pipeline 11 meet the test requirements.

[0043] The dimensions of the test section pipe 11 are consistent with those of an actual passive marine waste heat discharge pipe. During the experiment, condensation hammer occurred in the test section pipe 11. Pressure sensors, thermocouples, and visualization observation equipment were installed on the test section pipe 11 to study the pressure fluctuations, temperature changes, and gas-liquid two-phase flow characteristics during condensation hammer. The end of the test section pipe 11 is connected to a water tank 13 via a second flexible hose 12. The water tank 13 is used to simulate the actual marine environment, and a chiller 14 is used to maintain a constant water temperature in the tank.

[0044] The front end of the test section pipe 11 is connected to the anti-backflow device 9 via a flange. The anti-backflow device 9 is fixed on the six-degree-of-freedom swaying table 10. Figure 2 and Figure 3 As shown, the anti-backflow device 9 includes: a cavity shell 93 for heat preservation and observation of the internal gas-liquid two-phase flow; and a first flexible hose 91 for connecting the cavity shell 93 and the main circuit steam pipe, installed on the top of the cavity via a flange, for realizing six-degree-of-freedom movement of the cavity and steam flow into the steam injection channel 95, as shown. Figure 5 As shown; steam injection channel 95 is used to connect the outer shell 93 of the cavity and the subcooled water pipe 96, and to directionally inject steam into the test section pipe 11, such as... Figure 7 As shown; the subcooled water pipe 96 is used to connect the test section pipe 11 and the cavity, as follows. Figure 6 As shown; torsion spring 98 is used to connect baffle 97 and steam injection channel 95, providing restoring torque for baffle 97 to close; weight 99 is used to provide force for baffle to open, and works with torsion spring 98 to control the opening and closing of baffle 97; baffle 97 is used to prevent supercooled water from backflowing into steam injection channel 95, avoid steam condensation before entering the test section, and ensure the safety of the experimental device and the normal operation of the experimental process, such as... Figure 8 As shown.

[0045] The outer shell 93 is a cube structure made of five stainless steel square plates and one acrylic square plate bolted together to maintain a constant temperature of the internal liquid and to allow for visualization of the internal flow.

[0046] The first hose 91 uses a PTFE-lined metal hose to inject high-temperature steam into the steam injection channel 95, achieving a flexible connection between the cavity and the steam pipe, and enabling six-degree-of-freedom movement of the cavity. The first hose 91 is connected to the cavity through a flange.

[0047] The steam injection channel 95 is made of polycarbonate and is used to visualize the steam flow. The steam injection channel 95 has a 135° inclination angle to ensure that the injected steam velocity has components perpendicular to the baffle 97 and parallel to the subcooled water pipe 96. The steam injection channel 95 is bolted to the top plate of the cavity for easy replacement.

[0048] Both baffle 97 and weight 99 are made of 304 stainless steel, and are connected by welding. The torsion spring 98 has a fixed angle α when the baffle is closed. The stiffness of the torsion spring 98 and the mass of the weight 99 need to be selected based on the length and angle of inclination of the baffle 97, ensuring that the restoring torque of the torsion spring 98 on the baffle 97 before the experiment begins is equal to the external torque applied by the weight 99, thus maintaining the baffle 97 in a closed state through structural restraint.

[0049] The experimental focus of this invention is to realize the six-degree-of-freedom swing motion of the test section pipe 11 under the premise of ensuring safety, and to study the occurrence phenomenon and load of condensate hammer under specific test conditions.

[0050] An air compressor 15 and a fifth ball valve 605 are installed on the bypass branch. Before the experiment begins, the air compressor 15 and the fifth ball valve 605 are turned on, and the fourth ball valve 604 is closed to introduce air into the pipeline system to remove residual condensate in the pipeline. After the air has been purged for a period of time, the fourth ball valve 604 is turned on and the fifth ball valve 605 is closed. The second electric regulating valve 702 is used to fine-tune the flow rate in the main circuit to prevent the steam generator 1 from injecting too much steam into the main circuit.

[0051] At the start of the experiment, steam generator 1 produces steam at a stable pressure and temperature. The first vortex flow meter 201 measures the steam flow rate at the generator outlet. Based on the output flow signal from the first vortex flow meter 201, the opening of the second electric regulating valve 702 is adjusted to prevent excessive steam from entering the main circuit. The first thermocouple 301 and the first static pressure sensor 401 on the main circuit measure the steam pressure and temperature at the generator outlet. The gas-liquid separator 5 is equipped with a sight glass to ensure the steam in the main circuit is dry and to allow real-time observation of the separated water level. The first ball valve 601 is a normally open valve used to control the opening and closing of the main circuit channel. The first electric regulating valve 701 adjusts its opening based on the signals from the mass flow meter 8 and the second vortex flow meter 202 output to the control console, aiming to ensure that the steam injected into the test section pipe 11 reaches the experimental requirements. The specified flow rate under the experimental conditions; to ensure that the steam injected into the test section pipeline 11 has the temperature and pressure set under the experimental conditions, an end branch is set up, on which a third ball valve 603, a fourth thermocouple 304 and a fourth static pressure sensor 404 are installed. The second ball valve 602, the third thermocouple 303 and the third static pressure sensor 403 are symmetrically distributed on the main circuit. When the measured values ​​of the fourth thermocouple 304 and the fourth static pressure sensor 404 on the end branch reach the temperature and pressure required for the experiment, and the mass flow meter 8 displays that the steam mass flux specified under the experimental conditions has been reached, that is, the third ball valve 603 is closed and the second ball valve 602 is opened. According to the symmetry of the set circuit, the readings of the third thermocouple 303 and the third static pressure sensor 403 also meet the requirements of the experimental conditions. At this time, the steam at the outlet of the steam pipeline reaches the temperature, pressure and mass flux required for the experimental conditions.

[0052] The main circuit steam pipe is connected to the anti-backflow device 9 via the first flexible hose 91. The anti-backflow device 9 is fixed on the six-degree-of-freedom swaying table 10. The anti-backflow device 9 is connected to the test section pipe 11 via a flange. The test section pipe 11 is connected to the water tank 13 via the second flexible hose 12. This connection method allows the test section pipe 11 to follow the anti-backflow device 9 to perform a six-degree-of-freedom swaying motion. The water tank 13 is connected to the chiller 14 via heat exchange tubes to control the temperature and maintain a constant water tank temperature.

[0053] How to use the anti-backflow device 9: Figure 4As shown in (a), in the horizontal position, the baffle 97 is subjected to an external torque M1 = GLcosθ from the weight 99 (where L is the length of the baffle 97, θ is the angle between the baffle 97 and the horizontal plane, and G is the weight of the weight 99), and a restoring torque M2 = Kα from the torsion spring 98 (where α is the angle between the torsion spring 98 and the baffle in the closed state, and K is the torsional stiffness of the torsion spring). The weight G of the selected weight 99 makes M1 equal to M2, and the baffle 97 covers the outlet of the steam injection channel 95. Before the experiment begins, the six-degree-of-freedom swaying table 10 is stationary, the baffle 97 covers the steam injection channel 95, the torsion angle of the torsion spring 98 is α, and the angle between the baffle 97 and the horizontal plane is θ. After the experiment begins, according to the above experimental steps, steam is injected from the steam pipe of the main circuit into the anti-backflow device 9, as follows: Figure 2 As shown, at this time, under the pressure of the injected steam, the baffle 97 opens, and the steam is injected directionally into the test section pipeline 11; when the control console issues a command for the six-degree-of-freedom swaying table 10 to move, the anti-backflow device 9 follows the six-degree-of-freedom swaying table 10 to perform six-degree-of-freedom motion, among which the downward and upward tilting motions have a significant impact on the steam injection process; when the anti-backflow device 9 tilts downward, as... Figure 4 As shown in (b), the angle θ between the baffle 97 and the horizontal plane decreases, and cosθ increases, causing the opening torque M1 of the baffle 97 to increase. Under the combined action of the steam injection pressure, the baffle 97 opens, and steam is injected directionally into the test section pipeline 11; when the anti-backflow device 9 tilts upward, as shown in (b), the angle θ between the baffle 97 and the horizontal plane decreases, and cosθ increases, the opening torque M1 of the baffle 97 increases. Figure 4 As shown in (c), backflow occurs in the test section pipe 11 and the subcooled water pipe 96. The angle θ between the baffle 97 and the horizontal plane increases, and cosθ decreases, which reduces the opening torque M1 of the baffle 97. However, the angle α will not decrease due to structural constraints, and the restoring torque M2 of the torsion spring 98 remains unchanged, preventing the baffle 97 from opening and avoiding cold water from flowing into the steam injection channel 95, thereby protecting the safety of the system's pipeline circuit.

[0054] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A condensate hammer test device under sloshing conditions with backflow prevention, characterized in that, The system includes a main circuit steam pipeline, an anti-backflow device, and a test section pipeline. The anti-backflow device comprises a steam injection channel, a subcooled water pipeline, a baffle, and a torsion spring. The main circuit steam pipeline is connected to a steam generator and the steam injection channel. The test section pipeline is connected to the subcooled water pipeline. The steam injection channel is also connected to the subcooled water pipeline. The baffle is installed at the end of the steam injection channel connected to the subcooled water pipeline. The baffle and the steam injection channel are connected by the torsion spring. The anti-backflow device is fixed to a six-degree-of-freedom swaying platform. The main circuit steam pipeline is connected to the anti-backflow device via a first flexible hose. The anti-backflow device is connected to the test section pipeline via a flange. The test section pipeline is connected to a water tank via a second flexible hose. The water tank is connected to the chiller; the main circuit steam pipeline is composed of a first vortex flow meter, a first thermocouple, a first static pressure sensor, a gas-liquid separator, a first ball valve, a first electric regulating valve, a mass flow meter, a second thermocouple, a second static pressure sensor, a second vortex flow meter, a second ball valve, a third thermocouple, and a third static pressure sensor connected in sequence. The first vortex flow meter is connected to the steam generator, and the third static pressure sensor is connected to the anti-backflow device. It also includes a bypass branch, which is connected to the pipeline between the first vortex flow meter and the first thermocouple. The bypass branch includes a first branch and a second branch. The first branch includes a second electric regulating valve and a fourth ball valve, and the second branch includes a fifth ball valve and an air compressor.

2. The anti-backflow condensate hammer test device under sloshing conditions as described in claim 1, characterized in that, The anti-backflow device also includes a cavity shell, which is a cube structure made of five stainless steel square plates and one acrylic square plate. The steam injection channel is fixedly connected to the top plate of the cavity shell by bolts. The steam injection channel is made of polycarbonate material.

3. The anti-backflow condensate hammer test device under sloshing conditions as described in claim 2, characterized in that, The first hose is connected to the outer shell of the cavity via a flange. The first hose is a PTFE-lined metal hose and is used to inject high-temperature steam into the steam injection channel.

4. The anti-backflow condensate hammer test device under sloshing conditions as described in claim 1, characterized in that, It also includes an end branch, which is connected to the pipeline between the second vortex flow meter and the second ball valve, and the end branch includes a third ball valve, a fourth thermocouple and a fourth static pressure sensor.

5. The anti-backflow condensate hammer test device under sloshing conditions as described in claim 1, characterized in that, The anti-backflow device also includes a weight, which is installed on the baffle. The stiffness of the torsion spring and the mass of the weight satisfy the condition that the restoring torque of the torsion spring on the baffle before the start of the experiment is equal to the external torque applied by the weight, and the baffle is in a closed state.

6. The anti-backflow condensate hammer test device under sloshing conditions as described in claim 1, characterized in that, The steam injection channel has an inclination angle of 135°.

7. The anti-backflow condensate hammer test device under sloshing conditions as described in claim 5, characterized in that, Both the baffle and the weight are made of stainless steel and are connected by welding.

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