Device and method for testing high-temperature protective coating in hydrogen combustion environment

Abstract

The invention discloses a device and method for testing a high-temperature protective coating in a hydrogen combustion environment, and belongs to the technical field of material science and engineering.The device comprises a spray gun, a sample clamping structure and a service condition simulation device, and the service condition simulation device comprises a first cooling nozzle set, a second cooling nozzle set and a rotating platform; the rotating platform is used for rotating the sample to a coverage area and a non-coverage area of the oxyhydrogen flame, in the coverage area, the cooling medium sprayed by the first cooling nozzle group faces the surface, away from the oxyhydrogen flame, of the sample, and in the non-coverage area, the cooling medium sprayed by the second cooling nozzle group faces one or two surfaces of the sample; through a differential cooling strategy and dynamic rotation control, accurate performance testing of the high-temperature protective coating under the non-uniform thermal load is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of materials science and engineering, and particularly to a testing device and a testing method for high-temperature protective coatings in a hydrogen combustion environment. Background Art

[0002] High-temperature protective coatings are increasingly widely used on high-temperature components such as aeroengines and gas turbines, and their performance testing technology is crucial for material research and development. Currently, traditional coating testing equipment generally has the following defects: First, most use fixed heat sources and cannot dynamically adjust the temperature gradient, which is quite different from the actual working conditions; Second, most use natural gas or kerosene as fuel and cannot provide a pure hydrogen-oxygen combustion environment, or use external gas sources for gas supply, resulting in problems such as insufficient gas purity and inaccurate ratio control; Third, the specimen fixing method is single and cannot simulate the state of rotating components during actual operation; Fourth, there is a lack of an integrated cooling system and cannot reproduce the rapid cooling and heating process under actual working conditions; Fifth, the flame parameters cannot be adjusted in real time during the testing process, resulting in a deviation between the test results and the actual performance. And there are the following difficulties in overcoming the above technical problems: The high-temperature characteristics of the hydrogen-oxygen flame (up to 3000 °C) pose strict requirements on the equipment materials, the coordinated control of dynamically adjusting the flame distance and the specimen rotation speed is difficult, the real-time monitoring technology for the specimen state under high-temperature environment is imperfect, and the data acquisition and analysis system for multi-parameter coupling testing is complex. Therefore, there is an urgent need for a testing device that can accurately simulate the actual working environment of high-temperature protective coatings to evaluate the application reliability of high-temperature protective coatings. Summary of the Invention

[0003] The purpose of the present invention is to provide a testing device and a testing method for high-temperature protective coatings in a hydrogen combustion environment to solve the problems existing in the above-mentioned prior art, accurately simulate the actual working environment of high-temperature protective coatings, achieve multi-parameter dynamic adjustment, have real-time monitoring capabilities and ensure the safety and reliability of testing.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The present invention provides a testing device for high-temperature protective coatings in a hydrogen combustion environment, characterized by comprising:

[0006] A spray gun, which is connected to hydrogen and oxygen and is used for burning a hydrogen-oxygen mixed gas to generate a hydrogen-oxygen flame;

[0007] A specimen clamping structure for clamping a specimen;

[0008] Service condition simulation device, including a first cooling nozzle group, a second cooling nozzle group and a rotating platform. The first cooling nozzle group and the second cooling nozzle group are both used to spray a cooling medium to cool the surface of the specimen. The specimen clamping structure is located on the rotating platform, and the rotating platform is used to rotate the specimen to the covered area and the non-covered area of the hydrogen-oxygen flame. In the covered area, the cooling medium sprayed by the first cooling nozzle group faces the surface of the specimen away from the hydrogen-oxygen flame. In the non-covered area, the cooling medium sprayed by the second cooling nozzle group faces one or both sides of the specimen.

[0009] Preferably, it further includes a spray gun cooling module, which is installed near the spray gun and used to cool down the spray gun.

[0010] Preferably, it further includes a spray gun movement control module. The spray gun movement control module includes a stepping motor, a slide rail and a spray gun fixing seat. The spray gun fixing seat is used to fix the spray gun. The slide rail and the specimen are on the same straight line. The stepping motor drives the spray gun fixing seat to slide along the slide rail to adjust the linear distance between the spray gun and the specimen.

[0011] Preferably, it further includes an electrolytic cell, a water adding tank, an oxygen tank and a hydrogen tank. The electrolytic cell is connected to the water adding tank. The hydrogen tank and the oxygen tank respectively receive hydrogen and oxygen generated by the electrolytic cell.

[0012] Preferably, the first cooling nozzle group includes a first cooling nozzle, which is arranged on the back of the specimen with the closest linear distance to the spray gun. The second cooling nozzle group includes a second cooling nozzle and a third cooling nozzle. The second cooling nozzle and the third cooling nozzle are respectively arranged on the two side surfaces of the specimen with the farthest linear distance to the spray gun.

[0013] Preferably, the spray gun cooling module includes a cooling water tank, a circulation pump and a cooling pipeline. The cooling water tank is located outside the spray gun. The cooling pipeline is arranged on the outer wall of the spray gun. The inlet of the circulation pump is connected to the outlet of the cooling water tank, and the outlet of the circulation pump is connected to the inlet of the cooling pipeline.

[0014] Preferably, the spray gun includes a flame nozzle, and the flame nozzle is detachable.

[0015] Preferably, multiple groups of hole arrays with different spacings are arranged on the spray gun fixing seat for matching spray guns of different models.

[0016] Preferably, a control system is further included. The control system includes a central control panel, an experimental data storage module, a temperature monitoring module, and a spray gun position control module. The central control panel is connected to the temperature monitoring module and the spray gun position control module through an industrial bus. The experimental data storage module records the temperature data and the coordinates of the spray gun in real time and synchronizes the data with the central control panel. The alarm signal of the temperature monitoring module is directly connected to the spray gun position control module by a hard wire to trigger the emergency retraction action of the spray gun.

[0017] A test method for high-temperature protective coatings in a hydrogen combustion environment includes the following steps:

[0018] Step S1: Confirm that the functions of the spray gun, the specimen clamping structure, and the service condition simulation device are intact and can operate normally.

[0019] Step S2: Select the specimen to be tested, measure the size of the specimen and record the initial state.

[0020] Step S3: Fix the specimen through the specimen clamping structure and number or mark the surface of the specimen.

[0021] Step S4: The spray gun generates a high-temperature flame to spray the specimen to simulate a high-temperature environment, and the service condition simulation device is started to simulate the actual service environment and working state.

[0022] Step S5: Monitor the temperature on the front and back surfaces of the specimen in real time and record the flame characteristics, temperature field distribution, and specimen surface state data.

[0023] The present invention has achieved the following technical effects compared with the prior art:

[0024] The present invention sets up a service condition simulation device. Through the differential cooling strategy and dynamic rotation control, the accurate performance test of the high-temperature protective coating under non-uniform thermal loads is realized. Specifically, a unidirectional heat flow is formed between the hydrogen-oxygen flame coverage area and the first cooling nozzle group, and the second cooling nozzle group performs bilateral cooling in the non-coverage area, simulating the actual working conditions of gas impact-internal cooling of the rotating blade. The rotating platform periodically switches the specimen area to achieve alternating heating-cooling loads, and accurately evaluates the thermal shock resistance of the coating.

[0025] Other technical solutions included in the present invention can also achieve the following technical effects:

[0026] The present invention sets up a spray gun cooling module, which can effectively cool the nozzle position of the spray gun, maintain the long-term stability of the spray gun in a high-temperature environment, and improve the safety of the test.

[0027] The present invention is provided with a spray gun movement control module, enabling the spray gun to move on the slide rail, accurately controlling the heat flux density and temperature gradient on the surface of the specimen, simulating the unsteady thermal load experienced by the high-temperature protective coating during actual service, and further improving the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic diagram of the high-temperature protective coating test device in the hydrogen combustion environment according to the embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of the hydrogen-oxygen gas supply module according to the embodiment of the present invention.

[0031] Figure 3 It is a schematic diagram of the spray gun movement control module according to the embodiment of the present invention.

[0032] Figure 4 It is a schematic diagram of the rotating platform according to the embodiment of the present invention.

[0033] Figure 5 It is a schematic diagram of using a tubular specimen according to the embodiment of the present invention.

[0034] Among them, 1. Hydrogen-oxygen gas supply module; 2. Spray gun; 3. Spray gun movement control module; 4. Rotating platform; 5. Specimen; 6. First cooling nozzle; 7. Second cooling nozzle; 8. Third cooling nozzle; 9. Backfire valve; 10. Valve; 11. Pressure relay; 12. Pressure gauge; 13. Pressure transmitter; 14. Oxygen tank; 15. Hydrogen tank; 16. Electrolytic cell; 17. Temperature sensor; 18. First liquid level sensor; 19. Filter tank; 20. Water addition tank; 21. High-pressure pump; 22. Liquid level indicator; 23. Second liquid level sensor; 24. Flame nozzle; 25. Stepper motor; 26. Slide rail; 27. Spray gun fixing seat; 28. Rotating platform fixing seat; 29. Servo motor; 30. First thermocouple; 31. Second thermocouple; 32. Three-point temperature measuring device; 33. Colorimetric thermometer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] The purpose of the present invention is to provide a high-temperature protection coating testing device and testing method in a hydrogen combustion environment to solve the problems existing in the prior art, which can accurately simulate the actual working environment of the high-temperature protection coating, realize multi-parameter dynamic adjustment, have real-time monitoring capabilities, and ensure the safety and reliability of the test.

[0037] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] As Figures 1 to 5 shown, the present invention provides a high-temperature protection coating testing device in a hydrogen combustion environment, including: a spray gun 2, the spray gun 2 is connected to hydrogen and oxygen, and is used to burn the hydrogen-oxygen mixed gas to generate a hydrogen-oxygen flame; a specimen clamping structure for clamping the specimen 5; a service condition simulation device, including a first cooling nozzle group, a second cooling nozzle group, and a rotating platform 4. Both the first cooling nozzle group and the second cooling nozzle group are used to spray a cooling medium to cool the surface of the specimen 5. The specimen clamping structure is located on the rotating platform 4, and the rotating platform 4 is used to rotate the specimen 5 to the covered area and non-covered area of the hydrogen-oxygen flame. In the covered area, the cooling medium sprayed by the first cooling nozzle group faces the surface of the specimen 5 away from the hydrogen-oxygen flame. In the non-covered area, the cooling medium sprayed by the second cooling nozzle group faces one or both sides of the specimen 5. The setting of the service condition simulation device realizes the accurate performance test of the high-temperature protection coating under non-uniform thermal loads through a differential cooling strategy and dynamic rotation control. Specifically, a unidirectional heat flow is formed between the hydrogen-oxygen flame covered area and the first cooling nozzle group. The second cooling nozzle group performs bilateral cooling in the non-covered area, simulating the actual working condition of a rotating blade with gas impact-internal cooling. The rotating platform 4 periodically switches the specimen area to realize heating-cooling alternating loads, and accurately assesses the thermal shock resistance of the coating.

[0039] Further, the specimen 5 is in the form of a thermal barrier coating covering the alloy substrate surface.

[0040] Further, hydrogen and oxygen are provided by a hydrogen-oxygen gas supply module 1.

[0041] Further, the specimen clamping structure is a mechanical claw or a shape memory alloy fixture, and an alumina coating is sprayed on the contact surface between the specimen clamping structure and the specimen 5 to prevent adhesion between the specimen clamping structure and the specimen 5 at high temperatures.

[0042] Further, the cooling medium is compressed air or liquid nitrogen.

[0043] Further, the rotating platform 4 is installed on the rotating platform fixing seat 28.

[0044] Further, the rotating platform 4 can be manually rotated or driven to rotate by a servo motor 29.

[0045] Further, multiple groups of hole arrays with different spacings are arranged on the rotating platform 4 for matching different specimen clamping structures.

[0046] Further, the spray gun 2 is provided with two air inlets. One air inlet admits a hydrogen-oxygen mixed gas, and the other air inlet admits oxygen, which can make the flame more concentrated.

[0047] Further, the specimen 5 is a sheet specimen, and the cooling medium is sprayed from a direction perpendicular to the sheet specimen.

[0048] Further, the specimen 5 is a tubular specimen, and the inside of the tubular specimen is cooled by a cooling air flow.

[0049] As a preferred embodiment, it further includes a spray gun cooling module. The spray gun cooling module is installed near the spray gun 2 and is used to cool down the spray gun 2, maintain the long-term stability of the spray gun 2 in a high-temperature environment, and improve the safety of the test.

[0050] As a preferred embodiment, it further includes a spray gun motion control module 3. The spray gun motion control module 3 includes a stepping motor 25, a slide rail 26, and a spray gun fixing seat 27. The spray gun fixing seat 27 is used to fix the spray gun 2. The slide rail 26 and the specimen 5 are on the same straight line. The stepping motor 25 drives the spray gun fixing seat 27 to slide along the slide rail 26 to adjust the linear distance from the spray gun 2 to the specimen 5. By adjusting the linear distance from the spray gun 2 to the specimen 5, the heat flux density and temperature gradient on the surface of the specimen 5 can be precisely controlled, simulating the unsteady thermal load experienced by the high-temperature protective coating during actual service, and further improving the reliability of the test results.

[0051] As a preferred embodiment, it further includes an electrolytic cell 16, a water adding tank 20, an oxygen tank 14, and a hydrogen tank 15. The electrolytic cell 16 is connected to the water adding tank 20, and the hydrogen tank 15 and the oxygen tank 14 respectively receive the hydrogen and oxygen generated by the electrolytic cell 16.

[0052] Further, a filter tank 19 is provided between the hydrogen tank 15 and the electrolytic cell 16. The filter tank 19 is used to remove moisture, impurities, and particles in the wet hydrogen to ensure high purity of the hydrogen. The hydrogen and oxygen in the hydrogen tank 15 and the oxygen tank 14 enter the spray gun 2 after the pressure is increased by the high-pressure pump 21. The pressure gauge 12 real-time displays the pressures in the hydrogen tank 15 and the oxygen tank 14. The first liquid level sensor 18 and the liquid level indicator 22 are used to monitor the water level of the electrolytic cell 16, and the temperature sensor 17 is used to monitor the temperature of the electrolyte.

[0053] Further, the hydrogen-oxygen gas supply module 1 is also provided with a safety control system, including a pressure relay 11, a pressure transmitter 13, a solenoid valve, and a check valve, which are used to prevent gas backflow and overpressure. The solenoid valve is located at the outlets of the hydrogen tank 15 and the oxygen tank 14 and is controlled by the pressure relay 11. The pressure transmitter 13 is used to monitor the pressures in the hydrogen tank 15 and the oxygen tank 14. The pressure thresholds of the hydrogen tank 15 and the oxygen tank 14 are set through the pressure relay 11. When overpressure occurs, the solenoid valve is triggered to exhaust gas. The valve 10 is used to isolate the spray gun 2 from the hydrogen-oxygen gas supply module 1 during maintenance. The check valve is installed in the gas pipeline to ensure the one-way flow of hydrogen and oxygen. The water addition tank 20 monitors the water volume through the second liquid level sensor 23, and an alarm is triggered when the water level is low.

[0054] Further, a flashback preventer 9 is configured between the hydrogen-oxygen gas supply module 1 and the spray gun 2 to prevent the adverse effects of flashback on the equipment.

[0055] As a preferred embodiment, the first cooling nozzle group includes a first cooling nozzle 6, and the first cooling nozzle 6 is arranged on the back of the specimen 5 with the shortest straight-line distance from the spray gun 2. The second cooling nozzle group includes a second cooling nozzle 7 and a third cooling nozzle 8, and the second cooling nozzle 7 and the third cooling nozzle 8 are respectively arranged on the two side surfaces of the specimen 5 with the longest straight-line distance from the spray gun 2.

[0056] As a preferred embodiment, the spray gun cooling module includes a cooling water tank, a circulation pump, and cooling pipelines. The cooling water tank is located outside the spray gun 2, the cooling pipelines are arranged on the outer wall of the spray gun 2, the inlet of the circulation pump is connected to the outlet of the cooling water tank, and the outlet of the circulation pump is connected to the inlet of the cooling pipelines.

[0057] Further, the cooling pipelines can be spiral cooling water channels, and the cross-section of the spiral cooling water channels gradually decreases from the inlet to the outlet to balance the water flow rate and the heat dissipation efficiency. The cross-sectional shape of the spiral cooling water channels can be circular, rectangular, or trapezoidal.

[0058] Further, the spray gun cooling module includes inclined air holes with a diameter of dozens to hundreds of micrometers (50 - 2ooμm) opened on the inner wall of the spray gun 2, and nitrogen or argon is introduced into the air holes to form an insulating gas film on the high-temperature wall surface.

[0059] As a preferred embodiment, the spray gun 2 includes a flame nozzle 24, and the flame nozzle 24 is detachable. Since the nozzle is long-term exposed to high temperature (>1500 °C) and high-speed air flow, ablation, carbon deposition or slag accumulation are likely to occur. Timely replacement of the nozzle can, on the one hand, avoid the overall scrapping of the spray gun 2 and reduce the maintenance cost, and on the other hand, it can also change the temperature distribution, flow rate and coverage of the flame by changing the aperture or shape of the flame nozzle 24 to adapt to different test requirements.

[0060] Further, the flame nozzle 24 is a single-hole nozzle, with an aperture of 0.5 - 2 mm, and the outlet is a converging-diverging Laval structure, which concentrates the flame and has strong penetration.

[0061] Further, the flame nozzle 24 is a porous array nozzle, which includes 7 micropores with an aperture of 0.5 mm, arranged in a hexagonal close-packed pattern, and the axis of each micropore forms an angle of 20° with the center line, forming a swirling flame for uniform heating, dispersing the heat flow and avoiding local overheating.

[0062] As a preferred embodiment, multiple groups of hole arrays with different spacings are provided on the spray gun fixing seat 27 for matching different models of the spray gun 2.

[0063] As a preferred embodiment, a control system is further included. The control system includes a central control panel, an experimental data storage module, a temperature monitoring module and a spray gun position control module. The central control panel is connected to the temperature monitoring module and the spray gun position control module through an industrial bus. The experimental data storage module records the temperature data and the coordinates of the spray gun 2 in real time and synchronizes the data with the central control panel. The alarm signal of the temperature monitoring module is directly hard-wired to the spray gun position control module to trigger the emergency retraction action of the spray gun 2.

[0064] As Figures 1 to 5 shown, the present invention also provides a method for testing high-temperature protective coatings in a hydrogen combustion environment, including the following steps:

[0065] Step S1, confirm that the spray gun 2, the specimen clamping structure and the service condition simulation device are in good condition and can operate normally;

[0066] Step S2, select the specimen 5 to be tested, measure the size of the specimen 5 and record the initial state;

[0067] Step S3, fix the specimen 5 through the specimen clamping structure and number or mark the surface of the specimen 5;

[0068] Step S4: Adjust the flame temperature and the distance between the spray gun 2 and the specimen 5 in real time according to the test requirements. The spray gun 2 generates a high-temperature flame to spray the specimen 5 for simulating a high-temperature environment. Adjust the rotation speed and rotation time of the rotating platform 4 and the flow rate of the cooling medium according to the test requirements. The service condition simulation device is started to simulate the real service environment and actual working state.

[0069] Step S5: Measure the bottom surface temperature of the alloy matrix of the specimen 5 through the first thermocouple 30, measure the temperature at the alloy matrix / thermal barrier coating interface through the second thermocouple 31, measure the temperature of the cooling medium through the three-point temperature measuring device 32, and measure the temperature of the surface of the thermal barrier coating through the colorimetric thermometer 33, and record the flame characteristics, temperature field distribution and surface state data of the specimen 5.

[0070] The present invention provides a service condition simulation device. Through a differential cooling strategy and dynamic rotation control, accurate performance testing of a high-temperature protective coating under non-uniform thermal loads is achieved. Specifically, a unidirectional heat flow is formed between the oxy-hydrogen flame coverage area and the first cooling nozzle group, and the second cooling nozzle group performs bilateral cooling in the non-coverage area, simulating the actual working conditions of gas impingement-internal cooling of a rotating blade. The rotating platform 4 periodically switches the specimen area to achieve an alternating load of heating and cooling, which can accurately simulate the actual working environment of the high-temperature protective coating and ensure the accuracy of the test results.

[0071] Specific examples are used in the present invention to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A high-temperature protection coating testing device in a hydrogen combustion environment, characterized in that, Comprising: A spray gun (2), which is connected to hydrogen and oxygen and is used to burn the hydrogen-oxygen mixed gas to generate a hydrogen-oxygen flame; A specimen clamping structure for clamping a specimen (5); A service condition simulation device, including a first cooling nozzle group, a second cooling nozzle group and a rotating platform (4). Both the first cooling nozzle group and the second cooling nozzle group are used to spray a cooling medium to cool the surface of the specimen (5). The specimen clamping structure is located on the rotating platform (4), and the rotating platform (4) is used to rotate the specimen (5) to the covered area and the non-covered area of the hydrogen-oxygen flame. In the covered area, the cooling medium sprayed by the first cooling nozzle group faces the surface of the specimen (5) away from the hydrogen-oxygen flame. In the non-covered area, the cooling medium sprayed by the second cooling nozzle group faces one or both sides of the specimen (5).

2. The high-temperature protection coating testing device in a hydrogen combustion environment according to claim 1, characterized in that: It further includes a spray gun cooling module, which is installed near the spray gun (2) and is used to cool down the spray gun (2).

3. The high-temperature protection coating testing device in a hydrogen combustion environment according to claim 1, characterized in that: It further includes a spray gun movement control module (3), which includes a stepping motor (25), a slide rail (26) and a spray gun fixing seat (27). The spray gun (2) fixing seat (27) is used to fix the spray gun (2). The slide rail (26) and the specimen (5) are on the same straight line. The stepping motor (25) drives the spray gun fixing seat (27) to slide along the slide rail (26) to adjust the linear distance between the spray gun (2) and the specimen (5).

4. The high-temperature protection coating testing device in a hydrogen combustion environment according to claim 1, wherein: It further includes an electrolytic cell (16), a water adding tank (20), an oxygen tank (14) and a hydrogen tank (15). The electrolytic cell (16) is connected to the water adding tank (20), and the hydrogen tank (15) and the oxygen tank (14) respectively receive the hydrogen and oxygen generated by the electrolytic cell (16).

5. The high-temperature protection coating testing device under a hydrogen combustion environment according to claim 1, wherein: The first cooling nozzle group includes a first cooling nozzle (6), which is arranged on the back of the specimen (5) with the shortest linear distance from the spray gun (2). The second cooling nozzle group includes a second cooling nozzle (7) and a third cooling nozzle (8), and the second cooling nozzle (7) and the third cooling nozzle (8) are respectively arranged on both side surfaces of the specimen (5) with the longest linear distance from the spray gun (2).

6. The high-temperature protection coating testing device in a hydrogen combustion environment according to claim 2, wherein: The spray gun cooling module includes a cooling water tank, a circulation pump and a cooling pipeline. The cooling water tank is located outside the spray gun (2), the cooling pipeline is arranged on the outer wall of the spray gun (2), the inlet of the circulation pump is connected to the outlet of the cooling water tank, and the outlet of the circulation pump is connected to the inlet of the cooling pipeline.

7. The high-temperature protection coating testing device in a hydrogen combustion environment according to claim 1, characterized in that: The spray gun (2) includes a flame nozzle (24), and the flame nozzle (24) is detachable.

8. The high-temperature protection coating testing device in a hydrogen combustion environment according to claim 3, characterized in that: Multiple groups of hole arrays with different spacings are arranged on the spray gun fixing seat (27) for matching spray guns (2) of different models.

9. The high-temperature protection coating testing device under a hydrogen combustion environment according to claim 1, wherein: It further includes a control system, and the control system includes a central control panel, an experimental data storage module, a temperature monitoring module and a spray gun position control module. The central control panel is connected to the temperature monitoring module and the spray gun position control module through an industrial bus. The experimental data storage module records the temperature data and the coordinates of the spray gun (2) in real time and synchronizes the data with the central control panel. The alarm signal of the temperature monitoring module is directly connected to the spray gun position control module by a hard wire to trigger the emergency retraction action of the spray gun (2).

10. A testing method for high-temperature protective coatings in a hydrogen combustion environment, characterized in that: Applying the high-temperature protection coating testing device in a hydrogen combustion environment according to any one of claims 1-9, comprising the following steps: Step S1, confirm that the functions of the spray gun (2), the specimen clamping structure and the service condition simulation device are intact and can operate normally; Step S2, select the specimen (5) to be tested, measure the size of the specimen (5) and record the initial state; Step S3, fix the specimen (5) through the specimen clamping structure and number or mark the surface of the specimen (5); Step S4, the spray gun (2) generates a high-temperature flame to spray the specimen (5) to simulate a high-temperature environment, and the service condition simulation device is started to simulate the real service environment and the actual working state; Step S5, monitor the temperature on the front and back surfaces of the specimen (5) in real time, and record the flame characteristics, temperature field distribution and the surface state data of the specimen (5).

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