High-temperature water oxygen corrosion simulation test system based on hydrogen-mixed environment decoupling

Abstract

The invention provides a high-temperature water oxygen corrosion simulation test system based on hydrogen-mixed environment decoupling, which relates to the technical field of high-temperature material corrosion test equipment, and comprises a heating mechanism, a hydrogen pipeline, an oxygen pipeline and a water vapor generator, the heating mechanism is provided with a heating cavity for heating a sample and a heating cavity air inlet communicated with the heating cavity; the hydrogen pipeline is connected with a hydrogen source through a hydrogen flow meter; the oxygen pipeline is connected with an oxygen source through an oxygen flow meter; a gas inlet of the water vapor generator is communicated with the hydrogen pipeline and the oxygen pipeline, and a gas outlet of the water vapor generator is communicated with a gas inlet of the heating cavity; the device can be used for various different corrosion environment simulation tests at high temperature, corrosion research requirements of different material service environments are met, and an experimental basis is provided for development and performance optimization of new materials.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature material corrosion test equipment, and particularly to a high-temperature water-oxygen corrosion simulation test system based on decoupling of a hydrogen-mixed environment. Background Art

[0002] With the transformation of the global energy pattern towards more sustainable low-carbon solutions, the power generation industry is facing great pressure to decarbonize its operations. Gas turbine manufacturers are increasingly emphasizing the ability to improve the engine's hydrogen combustion capacity, increasing the proportion of hydrogen in the fuel, and ultimately achieving 100% hydrogen combustion. As a clean fuel, hydrogen produces only water vapor and heat when burned, eliminating carbon emissions and thus contributing to the decarbonization goal. However, an increase in the hydrogen content in the fuel introduces a higher concentration of water vapor in the combustion products. This elevated water vapor environment poses significant challenges to the materials used in gas turbines, especially the hot-end components. Operating under extreme conditions of high temperature and high pressure, the presence of water vapor exacerbates the oxidation and degradation processes of these materials, potentially leading to premature failure of turbine blades and reduced efficiency.

[0003] With the increase in the hydrogen fuel content, the performance requirements for high-temperature protective coatings become more stringent. Especially for high-temperature or ultra-high-temperature water-oxygen corrosion in a hydrogen-mixed combustion environment, it poses higher challenges to the durability of coating materials. The damage mechanism of water vapor corrosion to coating and substrate materials in such an environment is complex, affected by the combined action of temperature, atmosphere composition, and reaction mechanism, resulting in the diversity and unpredictability of coating failure. Therefore, designing a test device capable of simulating high-temperature or ultra-high-temperature water-oxygen corrosion environments has important scientific significance and practical application value. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature water-oxygen corrosion simulation test system based on decoupling of a hydrogen-mixed environment to solve the problems existing in the above-mentioned prior art. It can be used for various different corrosion environment simulation tests at high temperatures, meet the corrosion research needs of different material service environments, and provide an experimental basis for the development and performance optimization of new materials.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] A high-temperature water-oxygen corrosion simulation test system based on decoupling of a hydrogen-mixed environment includes a heating mechanism, a hydrogen gas pipeline, an oxygen gas pipeline, and a water vapor generator. The heating mechanism has a heating chamber for heating a specimen and a heating chamber air inlet communicating with the heating chamber; the hydrogen gas pipeline is connected to a hydrogen gas source through a hydrogen gas flowmeter; the oxygen gas pipeline is connected to an oxygen gas source through an oxygen gas flowmeter; the air inlet of the water vapor generator is communicated with the hydrogen gas pipeline and the oxygen gas pipeline, and the air outlet of the water vapor generator is communicated with the heating chamber air inlet.

[0007] As an embodiment, it further includes an inert gas pipeline, and the inert gas pipeline is communicated with the air inlet of the gas mixing module.

[0008] As an embodiment, it further includes a cold quenching chamber, a partition plate and a lifting rod; the cold quenching chamber is located above the heating mechanism, a cold quenching cavity is arranged in the cold quenching chamber, and a communication port communicated with the heating cavity is arranged on the lower surface of the cold quenching cavity; a cooling gas source port communicated with the cold quenching cavity is further arranged on the cold quenching chamber, and the cooling gas source port is used for communicating with a cooling gas source; the partition plate is arranged at the communication port, the partition plate is connected with a driving mechanism, and the driving mechanism is used to drive the partition plate to move so as to open or close the communication port; the lifting rod is connected with a lifting mechanism, the lifting rod penetrates into the cold quenching cavity from the top of the cold quenching chamber, and the bottom end of the lifting rod is used for installing the specimen, and the lifting rod is opposite to the communication port and can extend into the heating cavity from the communication port.

[0009] As an embodiment, a cold air exhaust port communicated with the cold quenching cavity is further arranged on the cold quenching chamber.

[0010] As an embodiment, a bottom connecting pipe and a top connecting pipe are respectively arranged at the bottom of the heating cavity and between the heating cavity and the cold quenching cavity, and the heating cavity air inlet is arranged on the bottom connecting pipe; the top connecting pipe is arranged opposite to the communication port.

[0011] As an embodiment, the heating mechanism includes a tube furnace, and a water cooling coil is arranged in the furnace wall of the tube furnace.

[0012] As an embodiment, a vertical pipe communicated with the cold quenching chamber is arranged at the top end of the cold quenching chamber, and the top end of the vertical pipe and the connection position of the vertical pipe and the cold quenching chamber are hermetically arranged; the lifting rod is arranged in the vertical pipe, a first magnet is fixed at the top end of the lifting rod, a second magnet is fixed at the lifting end of the lifting mechanism, and the first magnet attracts the second magnet.

[0013] As an embodiment, the lifting mechanism is a linear motor or a ball screw mechanism.

[0014] As an embodiment, a rotating rod is arranged in the cold quenching chamber, and the rotating rod is in transmission connection with a rotation driving mechanism; the rotating rod is connected with the partition plate through a connecting rod, and the partition plate is in sliding contact with the lower surface of the cold quenching cavity.

[0015] As an embodiment, a thermocouple is arranged in the heating cavity.

[0016] The present invention has the following technical effects compared with the prior art:

[0017] The water-oxygen corrosion simulation test system in the present invention can be used for simulating various different corrosion environment tests at high temperatures, including the hydrogen-mixed combustion environment in the high-pressure turbine section of an aero-engine, the high-temperature water-oxygen corrosion environment, and the complex atmosphere environment of an industrial gas turbine, so as to meet the corrosion research needs of different material service environments. It can be widely applied to studying the corrosion resistance behaviors of materials such as high-temperature coatings, metals, alloys, and ceramics in complex atmospheres, providing an experimental basis for the development and performance optimization of new materials.

[0018] Other technical effects that the present invention can achieve compared with the prior art will be described in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 to be used in the embodiments. Obviously, the drawings in the following description 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.

[0020] Figure 1 It is a schematic structural diagram of a high-temperature water-oxygen corrosion simulation test system based on hydrogen-mixed environment decoupling in an embodiment of the present invention;

[0021] Figure 2 It is a schematic principle diagram of a steam generator in an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of a lifting rod and a baffle when a specimen is quenched in a quenching chamber in an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of a lifting rod and a baffle when a specimen is heated in a heating chamber in an embodiment of the present invention.

[0024] DESCRIPTION OF THE REFERENCE NUMERALS:

[0025] 1. Tube furnace; 2. Hydrogen flowmeter; 3. Oxygen flowmeter; 4. Inert gas flowmeter; 5. Quenching chamber; 6. Baffle; 7. Lifting rod; 8. Communication port; 9. Cooling gas source port; 10. Cold gas exhaust port; 11. Bottom connecting pipe; 12. Top connecting pipe; 13. Heating chamber air inlet; 14. Vertical pipe; 15. Lifting mechanism; 16. Rotating rod; 17. Connecting rod; 18. Reserved air inlet; 19. Heating chamber exhaust port; 20. Peristaltic pump; 21. Gas filter; 22. Electromagnetic cut-off valve; 23. Controller; 24. Check valve; 25. Vaporization mixing module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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 of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0027] The object of the present invention is to provide a high-temperature water-oxygen corrosion simulation test system based on the decoupling of a hydrogen-mixed environment to solve the problems existing in the prior art. It can be used for various different corrosion environment simulation tests at high temperatures, meet the corrosion research needs of different material service environments, and provide an experimental basis for the development and performance optimization of new materials.

[0028] 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 with reference to the accompanying drawings and specific embodiments.

[0029] As Figures 1 to 4 shown, this embodiment provides a high-temperature water-oxygen corrosion simulation test system based on the decoupling of a hydrogen-mixed environment, including a heating mechanism, a hydrogen gas pipeline, an oxygen gas pipeline, and a steam generator. The heating mechanism can use a tube furnace 1 or other heating equipment. In this embodiment, the tube furnace 1 is used. The tube furnace 1 adopts induction heating or resistance heating methods, and its temperature control accuracy can reach ±2°C, and it has a multi-stage temperature programming function, which can realize the automatic control of multi-stage heating, constant temperature, and cooling to meet the requirements of complex test conditions. Before the test, the heating rate can be set to 10°C / min, and the working temperature range is from 25°C to 1600°C; in addition, a thermocouple is provided in the heating chamber of the tube furnace 1, and the thermocouple is used to monitor the temperature in the heating chamber in real time to adjust the temperature of the heating chamber. A water-cooled coil is also provided in the furnace wall of the tube furnace 1 to prevent the furnace body from overheating and damaging the electrical components on the outer wall of the tube furnace 1. A heating chamber air inlet 13 is also provided on the tube furnace 1 to introduce the atmosphere required for the test environment. The hydrogen gas pipeline is connected to the hydrogen gas source through a hydrogen gas flowmeter 2; the oxygen gas pipeline is connected to the oxygen gas source through an oxygen gas flowmeter 3; the steam generator ( Figure 1The air inlet of the water vapor generator (not shown) is connected to the hydrogen pipeline and the oxygen pipeline, and the air outlet of the water vapor generator is connected to the air inlet 13 of the heating chamber. The water vapor generator includes a peristaltic pump 20, a gas filter 21, an electromagnetic stop valve 22, a controller 23, a one-way valve 24, a heating module and a vaporization mixing module 25. The peristaltic pump 20 controls the water intake, and the flow adjustment range of the peristaltic pump 20 is 0.1mL / min to 100mL / min. The heating module is used to vaporize water into water vapor, and the water vapor is fully mixed with hydrogen and oxygen in the vaporization mixing module 25 and then transported to the high-temperature heating chamber of the tubular furnace 1; in this embodiment, the hydrogen pipeline, the oxygen pipeline and the pipeline between the water vapor generator and the heating chamber air inlet 13 are all provided with flow regulating valves, so as to generate a precisely controllable water-oxygen corrosion environment during the test. Of course, an atmosphere environment in which one or two of hydrogen, oxygen and water vapor are mixed can also be formed.

[0030] Therefore, the water-oxygen corrosion simulation test system in this embodiment can be used for a variety of different corrosion environment simulation tests under high temperature, including the mixed hydrogen combustion environment of the high-pressure turbine section of an aircraft engine, the high-temperature water-oxygen corrosion environment, and the complex atmosphere environment of an industrial gas turbine, thereby meeting the corrosion research needs of different material service environments. It can be widely used to study the corrosion resistance of high-temperature coatings, metals, alloys, ceramics and other materials in complex atmospheres, and provide experimental basis for the development of new materials and performance optimization.

[0031] In this embodiment, the flowmeter used to monitor hydrogen, oxygen, inert gas and the mixed gas of the three and water vapor is a rotor flowmeter, which is matched with a manual regulating valve to control the flow of each. The flow ratio of hydrogen, oxygen and water vapor can be adjusted in the range of 0% to 80% for hydrogen, 5% to 95% for oxygen and 5% to 90% for water vapor.

[0032] This embodiment also includes an inert gas pipeline, which is connected to the gas inlet of the gas mixing module 25. The inert gas pipeline is provided with an inert gas flow meter 4 and a flow regulating valve for maintaining the required gas pressure in the heating chamber. The inert gas can be argon.

[0033] In this embodiment, the tubular furnace 1 is further provided with a heating chamber exhaust port 19 for communicating with the heating chamber. The heating chamber exhaust port 19 is used to exhaust gas and to realize the circulation of a mixed gas of hydrogen, oxygen and water vapor to simulate the real atmosphere environment of the sample.

[0034] like Figure 1 , Figure 3 , Figure 4As shown in the figure, this embodiment further includes a cold quenching chamber 5, a partition plate 6, and a lifting rod 7. The cold quenching chamber 5 is located above the tubular furnace 1. A cold quenching cavity is provided in the cold quenching chamber 5, and a communication port 8 communicating with the heating cavity is provided on the lower surface of the cold quenching cavity. A cooling gas source port 9 communicating with the cold quenching cavity is further provided on the cold quenching chamber 5, and the cooling gas source port 9 is used to connect to a cooling gas source. The cooling gas source can be argon or other inert gases. In this embodiment, the partition plate 6 is arranged at the communication port 8, and the partition plate 6 is connected to a driving mechanism, and the driving mechanism is used to drive the partition plate 6 to move to open or close the communication port 8. The lifting rod 7 is connected to a lifting mechanism 15. The lifting rod 7 penetrates into the cold quenching cavity from the top of the cold quenching chamber 5. The bottom end of the lifting rod 7 is used to install a specimen, and the lifting rod 7 is aligned with the communication port 8 and can extend into the heating cavity from the communication port 8. During use, the bottom end of the lifting rod 7 grabs the specimen through a high-temperature-resistant fixture or suspends the specimen through a high-temperature-resistant metal wire. The lifting rod 7 penetrates through the cold quenching cavity and the communication port 8, and its bottom end is located in the heating cavity. The specimen is heated for a set time under certain temperature conditions in the heating cavity. Then, the lifting mechanism 15 drives the lifting rod 7 to move upward, so that the specimen moves up into the cold quenching chamber 5, and the partition plate 6 closes the communication port 8 under the drive of the driving mechanism. Then, cooling gas is introduced into the cold quenching chamber 5 to cool the specimen, and the change of the specimen is observed. The communication port 8 can also be opened, and then the specimen is put into the heating cavity for heating, and this is repeated a set number of times to observe the change of the specimen. Thus, by setting the cold quenching chamber 5 in this embodiment, the performance of the specimen under the condition of thermal cycling can be studied.

[0035] In this embodiment, a cold air exhaust port 10 communicating with the cold quenching cavity is further provided on the cold quenching chamber 5 for discharging the cooling gas.

[0036] During the heating process of the specimen in the tubular furnace 1, the communication port 8 is in an open state, and the atmosphere introduced into the heating cavity will leak into the cold quenching cavity, but this will not have an adverse impact on the simulation test of the specimen in a high-temperature complex atmosphere.

[0037] In this embodiment, a vacuum pumping port is further provided. The vacuum pumping port communicates with the heating cavity or the cold quenching cavity and is used to connect to a vacuum pumping device to evacuate the tubular furnace 1 and the cold quenching chamber 5 before the experiment starts after the specimen is put into the cold quenching chamber 5. When putting the specimen into the cold quenching chamber 5, check the front door sealing ring of the gas quenching chamber. There is no high-temperature deformation, discoloration, etching, holes, impurities, no impurities and no etching on the sealing surface between the front door and the gas quenching chamber cavity. If necessary, wipe it with alcohol.

[0038] In this embodiment, a bottom connecting pipe 11 and a top connecting pipe 12 are respectively provided at the bottom of the heating cavity and between the heating cavity and the cold quenching cavity. A heating cavity air inlet 13 is provided on the bottom connecting pipe 11. The top connecting pipe 12 is arranged opposite to the communication port 8, and a heating cavity exhaust port 19 is provided on the top connecting pipe 12.

[0039] In this embodiment, a vertical pipe 14 communicating with the cold quenching chamber 5 is provided at the top of the cold quenching chamber 5. The vertical pipe 14 is made of non-magnetic material, such as copper. The top of the vertical pipe 14 and the connection position between the vertical pipe 14 and the cold quenching chamber 5 are sealed. A lifting rod 7 is arranged in the vertical pipe 14. A first magnet is fixed at the top of the lifting rod 7, and a second magnet is fixed at the lifting end of the lifting mechanism 15. The second magnet can be an annular magnet sleeved outside the vertical pipe 14. The first magnet and the second magnet attract each other. When the second magnet moves up and down under the driving action of the lifting mechanism 15, the first magnet and the lifting rod 7 can be driven to move through the suction force between the second magnet and the first magnet, so as to realize the lifting of the lifting rod 7, and finally realize the transfer of the sample between the cold quenching chamber 5 and the heating chamber. Moreover, in this embodiment, by setting the vertical pipe 14 and using the magnetic attraction force to drive the lifting rod 7 to move, the way that the lifting mechanism 15 directly drives the lifting rod 7 to lift is replaced. When the lifting mechanism 15 directly drives the lifting rod 7 to move, on the one hand, the difficulty of sliding seal between the lifting rod 7 and the cold quenching chamber 5 increases. On the other hand, while the sample is heated in the heating chamber, the lifting rod 7 will also be heated, and the part of the lifting rod exposed outside the cold quenching chamber 5 is prone to scalding accidents, which is not conducive to the safe progress of the experiment.

[0040] In this embodiment, the lifting rod 7 is made of high-temperature resistant alloy or ceramic material and can operate stably in a high-temperature environment for a long time. The adjustable range of the moving speed of the lifting rod 7 is from 1 mm / s to 50 mm / s.

[0041] In this embodiment, the lifting mechanism 15 is a linear motor or a ball screw mechanism. Both the linear motor and the ball screw mechanism are common mechanisms in the art, and the principle of using the two to drive the lifting end to move up and down is well known to those skilled in the art. Therefore, this embodiment will not elaborate on this.

[0042] In this embodiment, a rotating rod 16 is arranged in the cold quenching chamber 5. The rotating rod 16 is in transmission connection with a rotation driving mechanism. The rotating rod 16 is connected to the partition plate 6 through a connecting rod 17, and the partition plate 6 is in sliding contact with the lower surface of the cold quenching cavity. The rotation driving mechanism can be a rotating motor or other mechanisms capable of driving the rotating rod 16 to rotate. By rotating the rotating rod 16, the partition plate 6 is driven to buckle or move away from the communication port 8.

[0043] In this embodiment, a reserved air inlet 18 is also provided on the cold quenching chamber 5 for standby.

[0044] Adaptations made according to actual needs are all within the protection scope of the present invention.

[0045] In the present invention, specific examples are used to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only for helping to 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 manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A high-temperature water-oxygen corrosion simulation test system based on the decoupling of a hydrogen-mixed environment, characterized in that, Comprising: A heating mechanism, the heating mechanism having a heating chamber for heating a specimen and a heating chamber air inlet communicating with the heating chamber; A hydrogen gas pipeline, the hydrogen gas pipeline being connected to a hydrogen gas source through a hydrogen gas flowmeter; An oxygen gas pipeline, the oxygen gas pipeline being connected to an oxygen gas source through an oxygen gas flowmeter; And a water vapor generator, an air inlet of the water vapor generator communicating with the hydrogen gas pipeline and the oxygen gas pipeline, and an air outlet of the water vapor generator communicating with the heating chamber air inlet.

2. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 1, wherein It further includes an inert gas pipeline, the inert gas pipeline communicating with an air inlet of the gas mixing module.

3. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 1, wherein It further comprises: A cold quenching chamber, the cold quenching chamber being located above the heating mechanism, a cold quenching chamber being provided in the cold quenching chamber, and a communication port communicating with the heating chamber being provided on a lower surface of the cold quenching chamber; a cooling gas source port communicating with the cold quenching chamber is further provided on the cold quenching chamber, and the cooling gas source port is used for communicating with a cooling gas source; A baffle plate, the baffle plate being provided at the communication port, the baffle plate being connected to a driving mechanism, and the driving mechanism being used to drive the baffle plate to move to open or close the communication port; And a lifting rod, the lifting rod being connected to a lifting mechanism, the lifting rod passing through the top of the cold quenching chamber into the cold quenching chamber, a bottom end of the lifting rod being used for mounting the specimen, and the lifting rod being opposite to the communication port and capable of extending into the heating chamber from the communication port.

4. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 3, wherein A cold air exhaust port communicating with the cold quenching chamber is further provided on the cold quenching chamber.

5. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 3, characterized in that, A bottom connecting pipe and a top connecting pipe are respectively provided at a bottom of the heating chamber and between the heating chamber and the cold quenching chamber; the heating chamber air inlet is provided on the bottom connecting pipe; the top connecting pipe is disposed opposite to the communication port.

6. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 5, characterized in that, The heating mechanism includes a tube furnace, and a water cooling coil is provided in a furnace wall of the tube furnace.

7. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 3, characterized in that A vertical pipe communicating with the cold quenching chamber is provided at a top end of the cold quenching chamber, and a top end of the vertical pipe and a connection position of the vertical pipe with the cold quenching chamber are hermetically provided; the lifting rod is provided in the vertical pipe, a first magnet is fixed to a top end of the lifting rod, and a second magnet is fixed to a lifting end of the lifting mechanism, and the first magnet attracts the second magnet.

8. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 7, wherein, The lifting mechanism is a linear motor or a ball screw mechanism.

9. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 3, wherein A rotating rod is provided in the cold quenching chamber, the rotating rod is in transmission connection with a rotation driving mechanism; the rotating rod is connected to the baffle plate through a connecting rod, and the baffle plate is in sliding abutment with a lower surface of the cold quenching chamber.

10. The high-temperature water-oxygen corrosion simulation test system based on decoupling in a hydrogen-mixed environment according to claim 1, wherein A thermocouple is provided in the heating chamber.

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