Compatibility test system for ultra-high-temperature gaseous environment material containing trace impurities

Abstract

The invention provides a compatibility test system for an ultrahigh-temperature gaseous environment material containing trace impurities, and relates to the technical field of chemistry and material experiments. The compatibility test system for the ultra-high-temperature gaseous environment material containing the trace impurities comprises a gas distribution unit, a pressurizing gas storage unit, a test unit and a sampling analysis unit. An ultra-high-temperature (less than or equal to 1200 DEG C) gaseous working medium environment is realized in a test section of a test system, and the content of trace gas impurities or water in the working medium is accurately controlled, so that the compatibility of the material and the environment is evaluated under the environment of specific temperature and specific impurity content.

Description

Technical Field

[0001] The present invention relates to the technical field of chemistry and material experiments, and in particular to a compatibility testing system for materials in an ultra-high temperature gaseous environment containing trace impurities. Background Art

[0002] Advanced nuclear energy systems, using nuclear reactors as heat sources and gaseous working fluids as circulating fluids, represent a fundamental innovation in the currently widely used "Steam Rankine Cycle" power technology and are internationally recognized as a major cutting-edge technology with the potential to transform the global power equipment landscape. Currently, the operating temperature range of common high-temperature / ultra-high-temperature gas-cooled reactors is roughly 300°C to 1200°C. During the development of high-temperature gaseous working fluid reactors, the selection of high-temperature metal structural materials is a bottleneck in the development of high-temperature / ultra-high-temperature gas-cooled reactor technology. Candidate materials for nuclear reactor cladding and structural materials, as well as core thermoelectric conversion components, must all meet environmental compatibility and mechanical performance requirements at these high temperatures.

[0003] Research has shown that during the construction, long-term operation, and maintenance of high-temperature / ultra-high-temperature gas-cooled reactors, small amounts of impurity gases can be introduced into the working fluid or generated through spontaneous reactions. Although the impurity concentration is only tens to hundreds of ppm, the impact of trace impurities is significant. These impurities can cause oxidation, carburization, or decarburization of materials at high temperatures, exacerbating the corrosion and degradation of system structural materials, leading to surface and internal corrosion of metals and deterioration of mechanical properties, thus impacting the safety and reliability of long-term system operation. Consequently, extensive research has been conducted domestically and internationally on the corrosion, mechanical degradation, and impurity control management systems for high-temperature helium-cooled reactors in impure environments. Based on these research, relevant impurity limit management specifications and operating procedures for helium-cooled reactors have been established. Currently, at the higher operating temperatures of ultra-high-temperature multi-element inert gas-cooled reactors, the deteriorating effects of trace impurities on material properties are significantly amplified with increasing temperature. The impact of trace impurities on material service performance cannot be ignored.

[0004] Therefore, it is necessary to carry out experimental research on material compatibility in ultra-high temperature gas environments containing trace impurities, and to understand the corrosion performance of key structural materials of the system in working fluid environments containing trace impurity gases. This has important guiding significance for establishing chemical management specifications and operating systems for system start-up and shutdown, steady-state operation, and material service life assessment. Summary of the Invention

[0005] The purpose of the present invention is to provide a material compatibility test system for an ultra-high temperature gaseous environment containing trace impurities, which realizes an ultra-high temperature (≤1200°C) gaseous working fluid environment in the test section of the test system and accurately controls the content of trace gas impurities or water in the working fluid, thereby realizing the evaluation of the compatibility of materials with the environment under a specific temperature and specific impurity content environment.

[0006] The present invention is achieved through the following technical solutions:

[0007] A material compatibility test system for ultra-high temperature gaseous environment containing trace impurities, comprising a gas distribution unit, a pressurized gas storage unit, a test unit and a sampling and analysis unit; wherein,

[0008] The gas distribution unit includes gas source pipeline 1, gas source pipeline 2 and gas source pipeline 3. Gas source pipeline 1 is provided with a purge gas source, gas source pipeline 2 is provided with a test gas source, and gas source pipeline 3 is provided with an impurity gas source.

[0009] The booster gas storage unit includes an air compressor, a booster pump and a buffer tank. The booster pump inlet is connected to the outlets of the air compressor, gas source pipeline 1, gas source pipeline 2 and gas source pipeline 3 respectively. The booster pump outlet is connected to the buffer tank inlet. The buffer tank outlet is connected to two parallel pipelines. The two parallel pipelines are equipped with gas storage tanks.

[0010] The test unit includes a high-temperature tube furnace, a water cooler, and a vacuum pump. The outlet ends of the two parallel pipelines are connected to the high-temperature tube furnace. A water cooling circuit is formed between the water cooler and the high-temperature tube furnace, and a vacuum pumping circuit is formed between the vacuum pump and the high-temperature tube furnace.

[0011] The sampling and analysis unit is used for online sampling and analysis of the gas composition and content of the outlet gas from the buffer tank, gas storage tank and high-temperature tube furnace.

[0012] Existing gas distribution systems usually use flow controllers to control the amount of gas injected. However, when mixing ppm-level gases, the flow controllers are not accurate enough. In addition, when the gas is transported in the system pipeline, the pipeline may adsorb gas, resulting in deviations in gas concentration, reducing the gas content and affecting the test results. Therefore, the inventors of this application use a buffer tank and a gas storage tank to achieve step-by-step dilution of the high-purity test gas source, which can stabilize the gas concentration and reduce flow fluctuations. At the same time, a sampling and analysis unit is used to analyze and detect the gas components and content of the outlet gas of the buffer tank, gas storage tank and high-temperature tube furnace in real time, accurately control the impurity gas content, and calibrate the impurity gas concentration in real time. The two aspects work together to achieve high-precision ppm-level gas distribution, improve the accuracy of the material and environmental compatibility assessment under specific impurity content environments, and ensure the reliability of the material compatibility test results.

[0013] The test system of the present invention can prepare and supply test media containing ppm-level gaseous impurities or gaseous water impurities into the test section. It also minimizes deviations in test results caused by residual gas in the pipeline, high-temperature precipitation of adsorbed gas in the test section, and external gas leakage. Equipped with a gas analyzer, it can sample and monitor impurity levels within the test section to ensure the reliability of material performance test results. This test system can be used to conduct compatibility testing of materials in ultra-high-temperature gaseous environments containing trace impurities, providing data support for establishing impurity control boundaries, chemical management specifications, and operating systems for high-temperature / ultra-high-temperature gas-cooled reactor working fluids.

[0014] Furthermore, gas source pipeline one is provided with filter one, pneumatic diaphragm valve one, purifier one and one-way valve one in sequence along the gas supply direction; gas source pipeline two is provided with filter two, pneumatic diaphragm valve two, mass flow controller one, purifier two and one-way valve two in sequence along the gas supply direction; gas source pipeline three is provided with filter three, pneumatic diaphragm valve three, mass flow controller two and one-way valve three in sequence along the gas supply direction.

[0015] Furthermore, pneumatic diaphragm valve four and pneumatic diaphragm valve five are respectively provided at the inlet and outlet ends of the booster pump, a stop valve one and a pressure reducing valve one are sequentially provided between the buffer tank and the inlet end of the parallel pipeline, a regulating valve one and a regulating valve two are respectively provided on the two parallel pipelines, a pressure reducing valve two is provided between the air compressor and the booster pump, and a pressure reducing valve three, a regulating valve three and a mass flow meter are sequentially provided between the outlet end of the parallel pipeline and the high-temperature tube furnace.

[0016] Furthermore, a gaseous water branch is provided between the first pressure reducing valve and the first regulating valve, and the gaseous water branch is provided with an evaporative water tank, a condensing gas storage tank and a fourth regulating valve in sequence along the flow direction of the gaseous water.

[0017] Furthermore, a safety valve and a needle valve 1 are connected to the gas storage tank, and a needle valve 2 is provided between the pressure reducing valve 3 and the regulating valve 3.

[0018] Furthermore, the sampling and analysis unit includes a pre-processing unit and a gas analysis instrument, and the outlet gases of the buffer tank, the gas storage tank and the high-temperature tube furnace enter the gas analysis instrument through the pre-processing unit respectively.

[0019] Furthermore, the inlet and outlet ends of the high-temperature tube furnace both use water-cooled flanges. The outlet end of the high-temperature tube furnace is connected to the discharge pipeline, and a regulating valve five is provided on the discharge pipeline. The furnace tube of the high-temperature tube furnace is a high-purity quartz glass tube. A sample holder is placed in the furnace tube, and a clamp is provided on the surface of the sample holder. The test holder is made of quartz material.

[0020] Furthermore, the vacuum pump includes a mechanical pump and a molecular pump, and a second stop valve and a third stop valve are provided on the vacuum pumping circuit.

[0021] Furthermore, a preheating furnace is provided between the gas storage tank and the high-temperature tubular furnace, and a stirring device is provided in the gas storage tank.

[0022] Furthermore, the test system also includes a computer control system, an over-temperature alarm, an over-pressure alarm and a flow abnormality alarm electrically connected to the computer control system, a pressure detector and a temperature detector are provided on the high-temperature tube furnace, a thermocouple is provided on the preheating furnace, and a pressure sensor is provided in the buffer tank. The pressure detector, temperature detector, thermocouple and pressure sensor are electrically connected to the computer control system respectively, and the sampling and analysis unit is electrically connected to the computer control system.

[0023] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0024] 1. The present invention achieves an ultra-high temperature (≤1200°C) gaseous working fluid environment within the test section of the test system and can precisely control the content of trace gas impurities or water in the working fluid (in the ppm range), thereby enabling material compatibility testing under a specific temperature and impurity content environment.

[0025] 2. The test system of the present invention can realize real-time measurement, control and data acquisition of operating parameters such as temperature, pressure and flow, and has sound and light alarm and interlock protection functions for operating faults such as over-temperature, over-pressure and flow loss;

[0026] 3. The test section of this invention utilizes a high-temperature tubular furnace design with water-cooled flanges at the inlet and outlet, effectively preventing problems such as external air leakage, high-temperature deformation of O-rings, or gas release. The furnace tube is made of high-purity quartz glass, and the sample holder placed within the furnace tube is also made of high-purity quartz. This effectively prevents the release of adsorbed gas from the furnace tube and sample holder during the test heating process, which could lead to deviations in the impurity content of the test medium.

[0027] 4. The test system of this invention uses EP-grade piping, VCR pipe joints, pneumatic diaphragm valves for main valves, and diaphragm-type booster pumps for gas. The inner wall of the gas tank for storing gas is electrolytically polished to effectively prevent contamination of the test medium caused by gas adsorption and air leakage.

[0028] 5. The test system of the present invention is equipped with a sampling and analysis unit, which can accurately analyze and detect the impurity composition and content of the test medium at the outlet of the buffer tank, gas storage tank and high-temperature tube furnace, ensuring the reliability of the material compatibility test results;

[0029] 6. The test system of the present invention is equipped with a gas booster pump and two gas storage tanks, one for use and one for backup during the test process, ensuring the continuity of gas supply in the test section and enabling long-term compatibility testing;

[0030] 7. The test system of the present invention is equipped with an overpressure relief device, which can effectively prevent the risk of quartz glass tube breakage caused by sudden pressure increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of a system for testing compatibility of materials in ultra-high temperature gaseous environments containing trace impurities, provided in Example 1 of the present invention.

[0032] Icons: 1-gas source pipeline 1, 2-gas source pipeline 2, 3-gas source pipeline 3, 4-boosting pump, 5-air compressor, 6-buffer tank, 7-gas storage tank, 8-preheating furnace, 9-high temperature tube furnace, 10-water cooler, 11-vacuum pump, 12-pretreatment unit, 13-gas analysis instrument, 14-computer control system, 15-purge gas source, 16-filter 1, 17-pneumatic diaphragm valve 1, 18-purifier 1, 19-check valve 1, 20-test gas source, 21-filter 2, 22-pneumatic diaphragm valve 2, 23-mass flow controller 1, 24-purifier 2, 25-check valve 2, 26-impurity gas source, 27 -Filter three, 28-Pneumatic diaphragm valve three, 29-Mass flow controller two, 30-Check valve three, 31-Pneumatic diaphragm valve four, 32-Pneumatic diaphragm valve five, 33-Stop valve one, 34-Pressure reducing valve one, 35-Regulating valve one, 36-Regulating valve two, 37-Pressure reducing valve two, 38-Pressure reducing valve three, 39-Regulating valve three, 40-Mass flow meter, 41-Regulating valve four, 42-Safety valve, 43-Needle valve one, 44-Needle valve two, 45-Regulating valve five, 46-Stop valve two, 47-Stop valve three, 48-Pressure detector, 49-Temperature detector, 50-Evaporating water tank, 51-Condensing gas storage tank, 52-Thermocouple. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with specific embodiments, but the examples do not limit the present invention in any form. Unless otherwise stated, the raw materials and reagents used in the examples of the present invention are conventionally purchased raw materials and reagents.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment provides a material compatibility test system for ultra-high temperature gaseous environment containing trace impurities, including a gas distribution unit, a pressurized gas storage unit, a test unit and a sampling and analysis unit; wherein,

[0036] The gas distribution unit includes a gas source pipeline 1, a gas source pipeline 2, and a gas source pipeline 3. The gas source pipeline 1 is provided with a purge gas source 15, the gas source pipeline 2 is provided with a test gas source 20, and the gas source pipeline 3 is provided with an impurity gas source 26.

[0037] The pressurized gas storage unit includes an air compressor 5, a booster pump 4 and a buffer tank 6. The inlet of the booster pump 4 is connected to the outlets of the air compressor 5, the gas source pipeline 1, the gas source pipeline 2 and the gas source pipeline 3 respectively. The outlet of the booster pump 4 is connected to the inlet of the buffer tank 6. The outlet of the buffer tank 6 is connected to two parallel pipelines. The two parallel pipelines are provided with an air storage tank 7.

[0038] The test unit includes a high-temperature tube furnace 9, a water cooler 10, and a vacuum pump 11. The outlet ends of the two parallel pipelines are connected to the high-temperature tube furnace 9. A water cooling circuit is formed between the water cooler 10 and the high-temperature tube furnace 9, and a vacuum pump 11 is formed between the vacuum pump 11 and the high-temperature tube furnace 9.

[0039] The sampling and analysis unit is used for online sampling and analysis of the gas composition and content of the outlet gas from the buffer tank 6, the gas storage tank 7 and the high-temperature tube furnace 9.

[0040] In the implementation manner of this embodiment, the gas source pipeline 1 is provided with a filter 16, a pneumatic diaphragm valve 17, a purifier 18 and a one-way valve 19 in sequence along the gas supply direction; the gas source pipeline 2 is provided with a filter 21, a pneumatic diaphragm valve 22, a mass flow controller 1 23, a purifier 24 and a one-way valve 25 in sequence along the gas supply direction; and the gas source pipeline 3 is provided with a filter 3 27, a pneumatic diaphragm valve 3 28, a mass flow controller 2 29 and a one-way valve 3 30 in sequence along the gas supply direction.

[0041] The purge gas source 15 uses 5N helium, which can be purified again by purifier 18. By controlling the opening and closing of pneumatic diaphragm valve 17, it is used to repeatedly replace and flush the pipeline gas before testing, achieving pipeline cleaning. The test gas source 20 can be purified again by purifier 24. The impurity gas source 26 is used to introduce gaseous impurities (such as oxygen and carbon monoxide). The computer control system 14 controls the coordinated use of mass flow controller 29, pneumatic diaphragm valve 3 28, and sampling and analysis unit to achieve precise proportioning of gaseous impurities at the ppm level.

[0042] In this embodiment, pneumatic diaphragm valves 4 31 and 5 32 are respectively installed at the inlet and outlet of booster pump 4. Stop valve 1 33 and pressure reducing valve 1 34 are sequentially installed between buffer tank 6 and the inlet of the parallel pipeline. Control valve 1 35 and control valve 2 36 are respectively installed on the two parallel pipelines. Pressure reducing valve 2 37 is installed between air compressor 5 and booster pump 4. Pressure reducing valve 3 38, control valve 3 39, and mass flow meter 40 are sequentially installed between the outlet of the parallel pipeline and high-temperature tube furnace 9. Air compressor 5 provides driving air for booster pump 4.

[0043] In this embodiment, a gaseous water branch is provided between pressure reducing valve 1 34 and regulating valve 1 35. This branch, along the gaseous water flow path, includes an evaporative water tank 50, a condensing gas storage tank 51, and a regulating valve 41. The evaporative water tank 50 is connected to the condensing gas storage tank 51 and, in conjunction with regulating valve 4 41, creates a negative pressure environment within the gas storage tank 7, achieving a precise proportion of gaseous water at the ppm level.

[0044] In this embodiment, a safety valve 42 and a needle valve 1 43 are connected to the gas tank 7, and a needle valve 2 44 is provided between the pressure reducing valve 3 38 and the regulating valve 3 39. The gas tank 7 has a volume of less than 30L. Two parallel pipelines allow for one in use and one in backup during testing, ensuring continuous gas supply to the test section and enabling long-term compatibility testing. The safety valve 42 also enhances system safety.

[0045] In this embodiment, the sampling and analysis unit includes a pre-processing unit 12 and a gas analyzer 13. The outlet gases from the buffer tank 6, gas storage tank 7, and high-temperature tube furnace 9 enter the gas analyzer 13 through the pre-processing unit 12. After flow regulation and pressure reduction are performed by the pre-processing unit 12, the sampled gas enters the gas analyzer 13, where a computer control system 14 reads the impurity composition and content of the analyzed gas in real time.

[0046] In this embodiment, the high-temperature tube furnace 9 utilizes water-cooled flanges at both its inlet and outlet. The outlet of the high-temperature tube furnace 9 is connected to a discharge line equipped with a regulating valve 545. The furnace tube of the high-temperature tube furnace 9 is constructed of high-purity quartz glass. A sample holder is placed within the furnace tube, and the sample holder is fitted with a fixture. The test holder is machined from quartz. The inlet and outlet flanges of the high-position tube furnace 9 are water-cooled and connected to a water chiller, effectively preventing problems such as external air leakage, high-temperature deformation of the O-ring, or gas release. The high-temperature tube furnace 9 utilizes high-purity quartz glass tubes. The sample holder is placed within the furnace tube, and the sample holder is machined from quartz. This effectively prevents the release of adsorbed gas from the furnace tube and sample holder during the test heating process, which could lead to deviations in the test gas impurity content. The high-purity quartz glass tube has a maximum working temperature of 1200°C, a constant temperature zone length of 200 mm, and an inner diameter of 80 mm. The heating element utilizes a silicon carbon rod with a temperature control accuracy of ±1°C. After the test medium passes through the high-temperature tube furnace 9, it is discharged through the regulating valve 5 45.

[0047] In this embodiment, the vacuum pump 11 comprises a mechanical pump and a molecular pump, and a second shutoff valve 46 and a third shutoff valve 47 are provided on the vacuum pump circuit. The vacuum pump 11 can achieve a vacuum degree of 0.001-0.1 Pa. It is connected to the inlet and outlet of the high-temperature tubular furnace 9, and a second shutoff valve 46 and a third shutoff valve 47 are provided between the aforementioned pipelines. By adjusting the closing of the second shutoff valve 46 and the third shutoff valve 47, air or flushing gas can be evacuated from the front-end gas storage tank 7 and pipeline, and the rear-end high-temperature tubular furnace 9 and pipeline.

[0048] In the implementation of this embodiment, a preheating furnace 8 is provided between the gas storage tank 7 and the high-temperature tubular furnace 9, and a stirring device is provided in the gas storage tank 7. The stirring device may be a fixed blade, which is provided in the air inlet pipe of the gas storage tank 7, and utilizes the turbulence generated when the gas flows through the fixed blade to achieve continuous mixing. The stirring device may be a vortex chamber, which accelerates gas convection, shortens the mixing time, and can quickly and evenly proportion trace gas tests. The stirring device is used to achieve dynamic mixing of the gas in the gas storage tank 7, prevent the mixed gas from having a concentration gradient, and improve the uniformity of the mixed gas. The preheating furnace 8 can preheat the mixed gas to the reaction temperature, reduce thermal shock, and reduce the interference of sudden temperature changes on the reaction.

[0049] In this embodiment, the test system also includes a computer control system 14, an over-temperature alarm, an over-pressure alarm, and an abnormal flow alarm electrically connected to the computer control system 14. The high-temperature tube furnace 9 is equipped with a pressure detector 48 and a temperature detector 49, the preheating furnace 8 is equipped with a thermocouple 52, and the buffer tank 6 is equipped with a pressure sensor. The pressure detector 48, temperature detector 49, thermocouple 52, and pressure sensor are each electrically connected to the computer control system 14. The sampling and analysis unit is also electrically connected to the computer control system 14. The high-temperature tube furnace 9 is equipped with two-point real-time temperature measurement, real-time pressure monitoring, and an over-pressure relief device to ensure a constant temperature in the middle section and prevent the furnace tube from rupturing due to overpressure. When the quartz glass tube of the high-temperature tube furnace 9 exceeds a preset temperature by more than 5°C, the computer control system 14 shuts off the heating power to the high-temperature tube furnace 9 and the over-temperature alarm sounds. When the pressure inside the quartz glass tube of the high-temperature tube furnace 9 exceeds 0.2 MPa, the computer control system 14 automatically controls the rear-end regulating valve 5 45 to accelerate exhaust. When the buffer tank 6 exceeds a preset pressure of 0.5 MPa, the computer control system 14 shuts off the power to the air compressor 5 and the overpressure alarm sounds. The computer control system 14 regulates the test system, ensuring its operational safety and reliability. The test system automatically and accurately measures, records, and stores operating parameters such as temperature, pressure, flow rate, and impurity composition and content. Some parameters and recorded curves are displayed and read in real time via a control interface.

[0050] The test method of the test system includes the following steps:

[0051] 1. Install the corrosion test sample: Open the flanges at both ends of the high-temperature tube furnace 9, clamp the sample into the fixture of the sample holder made of quartz glass, and place it in the middle constant temperature zone. Finally, install the O-ring and re-assemble the flange;

[0052] 2. Turn on the water cooler 10: Connect the water cooling flange, turn on the water cooler 10, and set the water cooler 10 to the preset temperature and flow rate;

[0053] 3. Test system cleaning: Open the purge gas source 15 to flush the entire test system pipeline, buffer tank 6, gas storage tank 7 and high-temperature tube furnace 9 quartz glass tube. The flushing time is not less than 5 minutes. After the flushing is completed, close the regulating valve 5 45 at the outlet of the high-temperature tube furnace 9 and start the vacuum pump 11 to remove the gas in the system in sections. Repeat the above steps 3 times, through repeated replacement and vacuuming to remove the influence of residual gas in the system;

[0054] 4. Configuring the Impurity-Containing Test Medium: A gas source 26 containing a specific amount of gaseous impurities is used to introduce gaseous impurities (such as oxygen and carbon monoxide) by mixing gaseous impurities in a specific proportion. The computer control system 14, through the coordinated use of mass flow controller 29, pneumatic diaphragm valve 3, and sampling and analysis unit, achieves precise proportioning of gaseous impurities at the ppm level within the buffer tank 6. The evaporative water tank 50 is connected to the condensing gas storage tank 51. In conjunction with the regulating valve 41 and the negative pressure environment created within the gas storage tank 7, precise proportioning of gaseous water at the ppm level can be achieved within the gas storage tank 7.

[0055] 5. Pressurization of the test medium: Start the air compressor 5 to provide driving air, pressurize the test gas and temporarily store it in the buffer tank 6;

[0056] 6. Sampling and analysis of the test medium: The pre-processing unit 12 performs flow regulation, pressure reduction, and other controls, and configures the gas to enter the gas analyzer 13 to determine whether the impurity composition and content in the buffer tank 6 meet the test requirements. If not, return to steps 4 and 5 to adjust the impurity content.

[0057] 7. Storage and analysis of test medium: The test medium that meets the requirements in the buffer tank 6 is placed into the gas storage tank 7 after decompression. The impurity composition and content of the test medium can also be reconfirmed through the sampling and analysis unit;

[0058] 8. Introducing the test medium and starting heating: After decompression, the test medium in the gas tank 7 is introduced into the quartz tube of the high-temperature tube furnace 9. The target heating temperature and heating rate are then preset, and heating is started. The real-time data recording and display function is enabled on the computer software.

[0059] 9. Sampling and analysis during the test: During the test, the outlet gas of the high-temperature tube furnace 9 can be introduced into the pre-treatment unit 12 for flow regulation, pressure reduction and other controls, and then enter the gas analysis instrument 13 to obtain the impurity composition and content of the test medium at the test outlet;

[0060] 10. Stop the test: After the test system's actual operating time reaches the set operating time, first stop heating the high-temperature tube furnace 9. During the cooling process, ensure that the test medium continues to flow into the inlet to prevent air from being sucked back into the test section and affecting the test results. When the temperature drops to room temperature, turn off the water chiller 10, disassemble the water-cooling flange, remove the corrosion test sample, and the test is complete.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A compatibility test system for materials in ultra-high temperature gaseous environments containing trace impurities, characterized in that: It includes gas distribution unit, pressurized gas storage unit, test unit and sampling and analysis unit; among which, The gas distribution unit includes gas source pipeline 1, gas source pipeline 2 and gas source pipeline 3. Gas source pipeline 1 is provided with a purge gas source, gas source pipeline 2 is provided with a test gas source, and gas source pipeline 3 is provided with an impurity gas source. The booster gas storage unit includes an air compressor, a booster pump and a buffer tank. The booster pump inlet is connected to the outlets of the air compressor, gas source pipeline 1, gas source pipeline 2 and gas source pipeline 3 respectively. The booster pump outlet is connected to the buffer tank inlet. The buffer tank outlet is connected to two parallel pipelines. The two parallel pipelines are equipped with gas storage tanks. The test unit includes a high-temperature tube furnace, a water cooler, and a vacuum pump. The outlet ends of the two parallel pipelines are connected to the high-temperature tube furnace. A water cooling circuit is formed between the water cooler and the high-temperature tube furnace, and a vacuum pumping circuit is formed between the vacuum pump and the high-temperature tube furnace. The sampling and analysis unit is used for online sampling and analysis of the gas composition and content of the outlet gas from the buffer tank, gas storage tank and high-temperature tube furnace.

2. The ultra-high temperature gaseous environment material compatibility test system containing trace impurities according to claim 1 is characterized in that: Gas source pipeline one is provided with filter one, pneumatic diaphragm valve one, purifier one and one-way valve one in sequence along the gas supply direction; gas source pipeline two is provided with filter two, pneumatic diaphragm valve two, mass flow controller one, purifier two and one-way valve two in sequence along the gas supply direction; gas source pipeline three is provided with filter three, pneumatic diaphragm valve three, mass flow controller two and one-way valve three in sequence along the gas supply direction.

3. The compatibility test system for materials in ultra-high temperature gaseous environments containing trace impurities according to claim 1, characterized in that: Pneumatic diaphragm valve four and pneumatic diaphragm valve five are respectively provided at the inlet and outlet ends of the booster pump, stop valve one and pressure reducing valve one are respectively provided between the buffer tank and the inlet end of the parallel pipeline, regulating valve one and regulating valve two are respectively provided on the two parallel pipelines, pressure reducing valve two is provided between the air compressor and the booster pump, and pressure reducing valve three, regulating valve three and mass flow meter are respectively provided between the outlet end of the parallel pipeline and the high-temperature tube furnace.

4. The compatibility testing system for materials in ultra-high temperature gaseous environments containing trace impurities according to claim 3, characterized in that: A gaseous water branch is provided between the first pressure reducing valve and the first regulating valve. The gaseous water branch is provided with an evaporative water tank, a condensing gas storage tank and a fourth regulating valve in sequence along the flow direction of the gaseous water.

5. The ultra-high temperature gaseous environment material compatibility test system containing trace impurities according to claim 4 is characterized in that: A safety valve and a needle valve 1 are connected to the gas storage tank, and a needle valve 2 is provided between the pressure reducing valve 3 and the regulating valve 3.

6. The compatibility testing system for materials in ultra-high temperature gaseous environments containing trace impurities according to claim 1, characterized in that: The sampling and analysis unit includes a pre-processing unit and a gas analysis instrument. The outlet gases of the buffer tank, the gas storage tank and the high-temperature tube furnace enter the gas analysis instrument through the pre-processing unit respectively.

7. The ultra-high temperature gaseous environment material compatibility testing system containing trace impurities according to claim 1 is characterized in that: The inlet and outlet of the high-temperature tube furnace are both equipped with water-cooled flanges. The outlet of the high-temperature tube furnace is connected to the discharge pipeline, and a regulating valve 5 is provided on the discharge pipeline. The furnace tube of the high-temperature tube furnace is a high-purity quartz glass tube. A sample holder is placed in the furnace tube, and a clamp is provided on the surface of the sample holder. The test holder is made of quartz material.

8. The ultra-high temperature gaseous environment material compatibility testing system containing trace impurities according to claim 7 is characterized in that: The vacuum pump includes a mechanical pump and a molecular pump, and a stop valve 2 and a stop valve 3 are provided on the vacuum pumping circuit.

9. The ultra-high temperature gaseous environment material compatibility testing system containing trace impurities according to claim 1, characterized in that: A preheating furnace is provided between the gas storage tank and the high-temperature tube furnace, and a stirring device is provided inside the gas storage tank.

10. The ultra-high temperature gaseous environment material compatibility testing system containing trace impurities according to claim 9, characterized in that: The test system also includes a computer control system, an over-temperature alarm, an over-pressure alarm and a flow abnormality alarm electrically connected to the computer control system, a pressure detector and a temperature detector are provided on the high-temperature tube furnace, a thermocouple is provided on the preheating furnace, and a pressure sensor is provided in the buffer tank. The pressure detector, temperature detector, thermocouple and pressure sensor are electrically connected to the computer control system respectively, and the sampling and analysis unit is electrically connected to the computer control system.

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