A material corrosion testing system based on the complex environment of high-temperature ammonia decomposition

Abstract

The present invention relates to a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition, comprising a corrosive medium configuration mechanism, a corrosive environment control mechanism and a corrosive reaction mechanism; the corrosive medium configuration system comprises a gas cylinder, a gas pressure stabilizing device and a feeding device connected in sequence; the corrosive environment control system is a control operation box, which is connected to the gas pressure stabilizing device and the feeding device; the corrosive reaction mechanism comprises a stress stretching device, a high-temperature ammonia decomposition stress corrosion device and a high-temperature ammonia decomposition chemical corrosion device which are separately arranged, and an ammonia tail gas treatment device; the high-temperature ammonia decomposition stress corrosion device and the high-temperature ammonia decomposition chemical corrosion device are simultaneously connected to the feeding device and the ammonia tail gas treatment device; the material corrosion testing system based on a complex environment of high-temperature ammonia decomposition can adjust the corrosive medium component, corrosive medium temperature, corrosive medium pressure and corrosive medium flow rate according to demand, and simultaneously realize stress and chemical corrosion testing and evaluation of multiple samples.

Description

Technical Field

[0001] The present invention relates to the field of corrosion mechanical properties testing, and in particular to a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition. Background Art

[0002] Hydrogen energy has become the most promising energy carrier to replace traditional fossil fuels due to its many advantages such as high calorific value, high energy density, and environmentally friendly combustion products. China's hydrogen energy industry is currently in a stage of rapid development. Solving the supply and demand mismatch problem in time and space has become the key to breaking through the industry bottleneck in hydrogen storage and transportation. Hydrogen energy storage and transportation is an intermediate hub connecting upstream hydrogen production and downstream hydrogen use. Due to the extremely low density of hydrogen at room temperature and pressure, low energy storage density per unit volume, and flammability and explosiveness, its safe and efficient transportation and storage are difficult. At present, high-pressure gaseous storage and transportation is the most mature storage and transportation method, but it has disadvantages such as low volume energy density and hydrogen embrittlement of hydrogen storage materials. Although liquid hydrogen storage and transportation has a high volume energy density, its production and storage require a lot of energy, and it has high requirements for liquefaction and storage equipment. Although solid-state hydrogen storage technology has high storage density and good safety, it still faces problems such as low performance of hydrogen storage materials and high cost. Compared with liquid hydrogen and other hydrogen storage media, liquid ammonia hydrogen storage has many advantages. First, ammonia is safer and easier to store and transport than hydrogen. Second, ammonia liquefaction is easier than hydrogen liquefaction, with lower energy consumption and production costs. Third, the storage cost of liquid ammonia is significantly lower, and its economic advantage is prominent. Fourth, the key technology for re-releasing hydrogen from ammonia (ammonia decomposition to produce hydrogen) is relatively mature. Among them, high-temperature ammonia decomposition to produce hydrogen is an important means of hydrogen production. Since ammonia will decompose into nitrogen and hydrogen at high temperatures, it will cause serious corrosion to the reactor materials, greatly reducing the safety of the high-temperature ammonia decomposition to produce hydrogen. Therefore, studying the changes in the corrosion properties of materials in the high-temperature ammonia decomposition environment is an important guarantee for the safe hydrogen production from high-temperature ammonia decomposition. At present, the corrosion test platform for high-temperature ammonia decomposition materials is only based on a single environment and a single sample type. Therefore, there is an urgent need for a corrosion test platform for multiple types of materials based on the complex environment of high-temperature ammonia decomposition. Summary of the Invention

[0003] In view of the defects of the ammonia decomposition hydrogen production process in the existing technology, the material corrosion testing platform under high-temperature ammonia decomposition conditions is only based on a single environment or a single type of material for testing; it is unable to comprehensively and accurately simulate and verify the corrosion of ammonia on different materials in a complex environment; provide a material corrosion testing system based on the complex environment of high-temperature ammonia decomposition, which can accurately simulate the corrosion conditions of different types of materials in the high-temperature ammonia decomposition environment, can detect the influence of different parameters on the corrosion effect of ammonia, and has a wide range of use and easy operation.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition, comprising: a corrosive medium configuration mechanism, a corrosive environment control mechanism and a corrosive reaction mechanism; the corrosive medium configuration mechanism comprises a gas cylinder, a gas pressure stabilizing device and a feeding device; the gas cylinder is connected to the gas pressure stabilizing device, which is in turn connected to the feeding device; the feeding device is used to deliver gas and abrasive to the corrosion reaction mechanism; the corrosive environment control mechanism is a control operation box, which is electrically connected to the gas pressure stabilizing device and the feeding device at the same time; the corrosion reaction mechanism comprises a stress stretching device, a high-temperature ammonia decomposition stress corrosion device, a high-temperature ammonia decomposition chemical corrosion device and an ammonia tail gas treatment device, and the high-temperature ammonia decomposition stress corrosion The device and the high-temperature ammonia decomposition chemical corrosion device are arranged separately; the high-temperature ammonia decomposition stress corrosion device is located in the middle of the stress stretching device; a sample support frame is fixed in the high-temperature ammonia decomposition chemical corrosion device, and a plurality of mesh discs are provided on the sample support frame, and a plurality of sample slots are also fixed on the mesh disc; the high-temperature ammonia decomposition stress corrosion device is connected to the first heating device, and the high-temperature ammonia decomposition chemical corrosion device is connected to the second heating device, and the first heating device and the second heating device are both electrically connected to the control operation box; the feeding device is simultaneously connected to the inlet of the high-temperature ammonia decomposition stress corrosion device and the inlet of the high-temperature ammonia decomposition chemical corrosion device, and the outlet of the high-temperature ammonia decomposition stress corrosion device and the outlet of the high-temperature ammonia decomposition chemical corrosion device are simultaneously connected to the ammonia tail gas treatment device.

[0005] Furthermore, the gas cylinder includes a nitrogen cylinder and an ammonia cylinder which are separately arranged, and the nitrogen cylinder and the ammonia cylinder are connected to the gas pressure stabilizing device at the same time; a flow meter and a one-way valve are sequentially arranged in series between the gas pressure stabilizing device and the feeding device; the flow meter is electrically connected to the control operation box; the feeding device includes a material pump and a feed port, the material pump and the feed port are directly connected, and the material pump is electrically connected to the control operation box.

[0006] Furthermore, the high-temperature ammonia decomposition stress corrosion device is located inside the first heating device and is in direct contact with the first heating device. Both ends of the high-temperature ammonia decomposition stress corrosion device are also connected to the stress stretching device. The opening of the high-temperature ammonia decomposition stress corrosion device is connected to the feeding device. The first heating device is a five-stage heating furnace, which can heat different positions inside the high-temperature ammonia decomposition stress corrosion device. The first heating device is electrically connected to the control operation box.

[0007] Furthermore, a flange interface is provided on the top of the high-temperature ammonia decomposition chemical corrosion device; the sample support frame includes a sample support rod and multiple mesh discs, and multiple disc slots are opened on the outer wall of the sample support rod. The multiple disc slots are distributed at intervals on the outer wall of the sample support rod, and the multiple disc slots are used to fix the corresponding mesh discs.

[0008] Furthermore, a disc buckle is provided on the mesh disc, and the disc buckle is used to adjust the opening and closing degree of the mesh disc; a plurality of sample slots are fixed on the edge of the mesh disc, and the sample slots are composed of a sample slot interlayer and a sample slot fixing clamp.

[0009] Furthermore, the high-temperature ammonia decomposition chemical corrosion device is fixed inside the second heating device, the second heating device is a five-stage heating furnace, and the second heating device is electrically connected to the control operation box.

[0010] Furthermore, an ammonia decomposition reaction tube and an ammonia decomposition heating furnace are provided inside the ammonia tail gas treatment device. The ammonia decomposition heating furnace is sleeved outside the ammonia decomposition reaction tube and fixedly connected to the outer wall of the ammonia decomposition reaction tube; the two ends of the ammonia decomposition reaction tube are respectively connected to the ammonia inlet and the decomposition gas outlet of the ammonia tail gas treatment device; the ammonia inlet of the ammonia tail gas treatment device is simultaneously connected to the outlet of the high-temperature ammonia decomposition chemical corrosion device and the outlet of the high-temperature ammonia decomposition stress corrosion device.

[0011] Furthermore, the ammonia decomposition reaction tube is filled with an ammonia decomposition catalyst, which is a ruthenium-based catalyst or a nickel-based catalyst; the ammonia tail gas treatment device is also provided with a pressure gauge and a control panel.

[0012] Furthermore, the outlet of the ammonia tail gas treatment device is connected to an air condenser, the outlet of the air condenser is connected to a stop valve and a back pressure valve, and the back pressure valve is further connected to a pressure sensor and a tail gas absorption device.

[0013] The material corrosion testing system based on the complex environment of high-temperature ammonia decomposition described in the present invention realizes synchronous comparative corrosion testing of different pressures, corrosive medium components, reaction temperatures and different sample shapes by respectively setting a stress stretching device, a high-temperature ammonia decomposition stress corrosion device, and setting multiple height-adjustable mesh discs in the high-temperature ammonia decomposition chemical corrosion device, combined with multiple sample slot interlayers on the mesh disc; it truly and effectively simulates the corrosion conditions in the high-temperature ammonia decomposition environment, can adjust the corrosive medium components, corrosive medium flow rate, corrosion reaction temperature and corrosion reaction pressure according to actual needs, and synchronously tests multiple types of samples, thereby improving the diversity, flexibility and effectiveness of the test system, and realizing the simultaneous implementation of stress corrosion, chemical corrosion testing and temperature gradient testing; further, combined with an ammonia tail gas treatment device with a decomposition effect, it achieves the recycling of ammonia, effectively prevents the harm caused by the direct discharge of ammonia and hydrogen into the air, and has high-quality tail gas treatment function and environmental protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific embodiments of the present invention, the following will briefly introduce the drawings required for use in the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic structural diagram of a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention;

[0016] Figure 2 This is a schematic diagram of the assembly of a sample support rod and a mesh disc in a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention;

[0017] Figure 3 This is a schematic structural diagram of a sample tank in a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention;

[0018] Figure 4 This is a schematic structural diagram of a sheet sample of an ammonia tail gas treatment device of a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention;

[0019] Figure 5 This is a schematic structural diagram of a tensile specimen of an ammonia tail gas treatment device of a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention;

[0020] Figure 6 This is a schematic structural diagram of a fatigue specimen of an ammonia tail gas treatment device of a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention;

[0021] Figure 7 This is a schematic structural diagram of a C-ring specimen of an ammonia tail gas treatment device of a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention;

[0022] Figure 8 This is a schematic structural diagram of an ammonia tail gas treatment device of a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention;

[0023] Figure 9 This is a schematic diagram of the internal structure of an ammonia tail gas treatment device of a material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] like Figures 1 to 9 As shown, the material corrosion testing system based on the complex environment of high-temperature ammonia decomposition according to the present invention comprises: a corrosive medium configuration mechanism, a corrosive environment control mechanism and a corrosion reaction mechanism;

[0026] The corrosive medium configuration mechanism includes a gas cylinder 1, a gas pressure stabilizing device 19, and a feeding device; the gas cylinder 1 is connected to the gas pressure stabilizing device 19, which is in turn connected to the feeding device; the feeding device is used to deliver gas and abrasive to the corrosive reaction mechanism;

[0027] The corrosion environment control mechanism is a control operation box 9, and the control operation box 9 is electrically connected to the gas pressure stabilizing device 19 and the feeding device;

[0028] The corrosion reaction mechanism includes a stress stretching device 5, a high-temperature ammonia decomposition stress corrosion device 6, a high-temperature ammonia decomposition chemical corrosion device 16, and an ammonia tail gas treatment device 15. The high-temperature ammonia decomposition stress corrosion device 6 and the high-temperature ammonia decomposition chemical corrosion device 16 are separately arranged; the high-temperature ammonia decomposition stress corrosion device 6 is located in the middle of the stress stretching device 5; a sample support frame 8 is fixed in the high-temperature ammonia decomposition chemical corrosion device 16, and a plurality of mesh discs 26 are provided on the sample support frame 8. A plurality of sample slots are also fixed on the mesh disc 26;

[0029] The high-temperature ammonia decomposition stress corrosion device 6 is connected to the first heating device, and the high-temperature ammonia decomposition chemical corrosion device 16 is connected to the second heating device. The first heating device and the second heating device are both electrically connected to the control operation box 9; the feeding device is simultaneously connected to the inlet of the high-temperature ammonia decomposition stress corrosion device 6 and the inlet of the high-temperature ammonia decomposition chemical corrosion device 16, and the outlet of the high-temperature ammonia decomposition stress corrosion device 6 and the outlet of the high-temperature ammonia decomposition chemical corrosion device are simultaneously connected to the ammonia tail gas treatment device 15.

[0030] exist Figure 1In the embodiment, the gas cylinder 1 includes a nitrogen cylinder and an ammonia cylinder which are separately arranged, and the nitrogen cylinder and the ammonia cylinder are simultaneously connected to the gas pressure stabilizing device 19; hydrogen and nitrogen are mixed at a certain pressure and a certain concentration ratio and then enter the gas pressure stabilizing device 19 for pressure stabilization; the mixed hydrogen and nitrogen are pressure-stabilized by the gas pressure stabilizing device 19 and then pass into the high-temperature ammonia decomposition stress corrosion device 6 and the high-temperature ammonia decomposition chemical corrosion device 16; wherein the gas pressure stabilizing device 19 assembles a pressure stabilizing valve and various accessories in a closed box, and adjusts the gas output pressure of the gas pressure stabilizing device 19 by controlling the operation box 9; In order to detect the flow rate and pressure of the gas discharged from the gas pressure stabilizing device 19, and at the same time ensure the flow direction of the gas and reduce the risk and impact of gas backflow, preferably, a flow meter 2 and a one-way valve 18 are sequentially arranged in series between the gas pressure stabilizing device 19 and the feeding device; the flow meter 2 is electrically connected to the operation control box 19; further, the feeding device includes a material pump 3 and a feed port 4, the material pump 3 is directly connected to the feed port 4, the material pump 3 is electrically connected to the control operation box 9, and the material pump 3 is used to feed the high-temperature ammonia decomposition stress corrosion device 6 and the high-temperature Solid abrasives, such as quartz sand, are introduced into the ammonia decomposition chemical corrosion device 16 to realize high-temperature corrosion and erosion tests of materials; the feed port 4 is connected to the inlet of the high-temperature ammonia decomposition stress corrosion device 6 and the inlet of the high-temperature ammonia decomposition chemical corrosion device 16 respectively; the ammonia and nitrogen after pressure stabilization, and the solid abrasives, such as quartz sand, in the material pump 3 are introduced into the high-temperature ammonia decomposition stress corrosion device 6 and the high-temperature ammonia decomposition chemical corrosion device 16 through the feed port 4; for testing the corrosion effect of ammonia; in the process of introducing gas and solid, the control operation box 9 detects the flow meter 2 to Control the flow rate of gas discharged from the gas pressure stabilizing device 19; similarly, the control operation box 9 controls the amount of solid introduced into the inlet of the high-temperature ammonia decomposition stress corrosion device 6 and the high-temperature ammonia decomposition chemical corrosion device 16 by controlling the material pump 3; this is used for subsequent simulation and testing of ammonia corrosion in a high-temperature environment; by simultaneously setting nitrogen and hydrogen cylinders and adjusting the concentration ratio of ammonia and nitrogen, as well as whether to simultaneously introduce solid abrasives, such as quartz sand, through the material pump 3; thereby changing the composition of the corrosive medium, verifying the corrosion conditions of different corrosive media under the condition of high-temperature ammonia decomposition, and better simulating the corrosion conditions under real working conditions;

[0031] The high-temperature ammonia decomposition stress corrosion device 6 is arranged inside the stress stretching device 5. Specifically, the sample to be tested is arranged inside the high-temperature ammonia decomposition stress corrosion device 6, and the two ends of the sample are respectively connected to the upper pull head and the lower pull head of the stress stretching device 5; the high-temperature ammonia decomposition stress corrosion device 6 is located inside the first heating device and is in direct contact with the first heating device 17, and the two ends of the high-temperature ammonia decomposition stress corrosion device 6 are also connected to the stress stretching device 5; the opening of the high-temperature ammonia decomposition stress corrosion device 6 is connected to the feed port 4, and the gas and solid abrasive introduced through the feed port 4 directly enter the high-temperature ammonia decomposition stress corrosion device 6 for corrosion testing; wherein, the first heating device 17 is a five-section heating furnace, and the five-section heating furnace 17 can heat different positions inside the high-temperature ammonia decomposition stress corrosion device 6. Heat; the pressure stretching device 5 can stretch the high-temperature ammonia decomposition stress corrosion device 6 to change the internal stress of the sample, and by adjusting the output power of the five-stage heating furnace, the internal temperature of the high-temperature ammonia decomposition stress corrosion device 6 and the ammonia decomposition are controlled by heating, so as to test the corrosion of the sample in a high-temperature ammonia decomposition environment under different stress states; more specifically, the five-stage heating furnace is also electrically connected to the operation control box 9; the operation control box 9 controls the gas pressure stabilizing device 19, the flow meter 2, the five-stage heating furnace 17 and the material pump 3 to realize the ammonia decomposition material corrosion test under different pressures, different flow rates, different temperatures and different corrosive media, thereby improving the test diversity of the system and being able to simulate ammonia decomposition corrosion conditions under various conditions; the gas after the test is discharged through the outlet of the high-temperature ammonia decomposition pressure corrosion device 6.

[0032] The high temperature ammonia decomposition chemical etching device 16 is provided with a sample support frame 8 inside, and a flange interface 7 is provided on the top of the high temperature ammonia decomposition chemical etching device 16; Figure 2 and Figure 3As shown, the sample support frame 8 includes a sample support rod 21 and a plurality of mesh discs 26, and the installation direction of the mesh disc 26 is perpendicular to the extension direction of the sample support rod 21; a plurality of disc slots 25 are provided on the outer wall of the sample support rod 21, and the plurality of disc slots 25 are spaced apart on the outer wall of the sample support rod 21, and the plurality of disc slots 25 are used to fix the mesh disc 26 accordingly, and by embedding the mesh disc 26 into each disc slot 25 accordingly, the relative position of the mesh disc 26 on the sample support rod 21 is adjusted, thereby adjusting the height of the fixed disc in the high-temperature ammonia decomposition chemical etching device 16; wherein, a disc buckle 22 and a plurality of sample slots 20 are provided on the mesh disc 26, and the disc buckle 22 is used to adjust the opening and closing degree of the mesh disc 26 to achieve fixed connection between the mesh disc 26 and the corresponding disc slot 25; a plurality of sample slots 20 are fixed on the edge of the mesh disc 26, and the sample slots 20 It consists of a sample slot interlayer 23 and a sample slot fixing clamp 24. The sample slot 20 is used to carry the sample to be tested, and the sample slot fixing clamp 24 can stably fix the sample slot 20 on the mesh disc 26; the sample slot interlayer 23 is used to place the test sample; specifically, the sample slot interlayer 23 of multiple sample slots 20 is arranged towards the same side of the corresponding mesh disc 26; the sample slot 20 is vertically fixed on the mesh disc 26; multiple sample slots 20 are evenly distributed on the edge of the mesh disc 26; further, the surface of the mesh disc 26 is also used to place samples of different shapes. By placing samples of different shapes on the surface of the mesh disc 26 and in the sample slot interlayer 23 of the sample slot 20, the specific number of discs can be adjusted according to actual conditions. This design realizes chemical corrosion testing of different types of samples (such as sheet, tensile, fatigue, C-ring) in a high-temperature ammonia decomposition environment; that is, high-temperature ammonia decomposition corrosion testing of multiple types of samples is carried out simultaneously.

[0033] like Figures 5 to 7 As shown, the sample types include sheet sample 27, tensile sample 28, fatigue sample 31 and C-ring sample 30; the sheet sample 27 and tensile sample 28 are placed in the sample slot 20 on the mesh disc 26, and the fatigue sample 31 and C-ring sample 30 are placed directly on the mesh disc 26, so that high-temperature ammonia decomposition corrosion test can be carried out simultaneously on multiple types of samples.

[0034] Similarly, the high-temperature ammonia decomposition chemical corrosion device 16 is fixed inside the second heating device 171. The second heating device 171 is a five-stage heating furnace. The second heating device 171 is electrically connected to the operation control box 9. The operation control box 9 controls the second heating device 171 and adjusts the position of each mesh disc 26 relative to the sample support rod 21 at the same time, thereby realizing ammonia decomposition material corrosion testing of samples of different shapes under different temperature gradients, thereby improving the test diversity of the system and being able to accurately simulate high-temperature ammonia decomposition corrosion test conditions under different conditions; the gas after the reaction is discharged through the outlet of the high-temperature ammonia decomposition chemical corrosion device 16.

[0035] exist Figure 1 In the embodiment, the outlet of the high-temperature ammonia decomposition chemical etching device 16 and the outlet of the high-temperature ammonia decomposition stress corrosion device 6 are simultaneously connected to the ammonia tail gas treatment device 15 to further decompose and treat the unreacted ammonia in the etching device so that it can be absorbed by the tail gas absorption device; Figure 8 and Figure 9 As shown, the ammonia tail gas treatment device 15 is internally provided with an ammonia decomposition reaction tube 34 and an ammonia decomposition heating furnace 35, the ammonia decomposition heating furnace 35 is sleeved on the outside of the ammonia decomposition reaction tube 34 and fixedly connected to the outer wall of the ammonia decomposition reaction tube 34; the two ends of the ammonia decomposition reaction tube 34 are respectively connected to the ammonia inlet and the decomposition gas outlet of the ammonia tail gas treatment device 15; the ammonia inlet of the ammonia tail gas treatment device 15 is simultaneously connected to the outlet of the high-temperature ammonia decomposition chemical etching device 16 and the outlet of the high-temperature ammonia decomposition stress corrosion device 6; the gas after the corrosion test enters the ammonia tail gas treatment device 15 at the same time, and then enters the ammonia decomposition reaction tube 34 for decomposition reaction to generate hydrogen and nitrogen; so as to fully treat the remaining ammonia and reduce the pollution caused by the direct discharge of ammonia into the air; in order to improve the ammonia The decomposition rate of ammonia in the decomposition reaction tube 34 is as follows: specifically, the ammonia decomposition reaction tube 34 is filled with an ammonia decomposition catalyst, such as a ruthenium-based catalyst or a nickel-based catalyst. Under the synchronous heating of the ammonia decomposition heating furnace 35, the residual ammonia in the gas is fully decomposed to generate a mixed gas of hydrogen and nitrogen; the generated hydrogen-nitrogen mixed gas is discharged from the ammonia decomposition reaction tube 34 and discharged from the ammonia tail gas treatment device 15 through the decomposer outlet of the ammonia tail gas treatment device 15; more specifically, in order to achieve accurate control of the decomposition of ammonia in the ammonia tail gas treatment device 15, the ammonia tail gas treatment device 15 is further provided with a pressure gauge 32 and a control panel 33 to accurately detect and control the gas pressure and temperature in the ammonia tail gas treatment device 15, so as to ensure the stable decomposition of ammonia in the ammonia tail gas treatment device 15.

[0036] In order to achieve further absorption of the decomposed hydrogen and nitrogen, preferably, the outlet end of the ammonia tail gas treatment device 15 is connected to an air condenser 14, the outlet end of the air condenser 14 is connected to the stop valve 13 and the back pressure valve 12, the back pressure valve 12 is connected to the pressure sensor 10, and the inlet end of the tail gas absorption device 11 is connected to the back pressure valve 12; the ammonia tail gas treatment device 15 effectively treats the ammonia that has not completely reacted in the corrosion device through an efficient ammonia decomposition reaction, cools the tail gas through the air condenser 14 and reduces the pressure of the tail gas through the back pressure valve 12, and is finally absorbed by the tail gas absorption device 11, reducing the risk of hydrogen and unreacted ammonia being directly discharged into the air, thereby achieving effective recovery and collection of the gas.

[0037] The present invention is not limited to the corrosion environment being an ammonia environment, and is also applicable to corrosion experiments in environments such as sulfur dioxide and carbon dioxide.

[0038] The material corrosion testing system based on the complex environment of high-temperature ammonia decomposition described in the present invention realizes synchronous comparative corrosion testing of different pressures, corrosive medium components, reaction temperatures and different sample shapes by respectively setting a stress stretching device, a high-temperature ammonia decomposition stress corrosion device, and setting multiple height-adjustable mesh discs in the high-temperature ammonia decomposition chemical corrosion device, combined with multiple sample slot interlayers on the mesh disc; it truly and effectively simulates the corrosion conditions in the high-temperature ammonia decomposition environment, can adjust the corrosive medium components, corrosive medium flow rate, corrosion reaction temperature and corrosion reaction pressure according to actual needs, and synchronously tests multiple types of samples, thereby improving the diversity, flexibility and effectiveness of the test system, and realizing the simultaneous implementation of stress corrosion, chemical corrosion testing and temperature gradient testing; further, combined with an ammonia tail gas treatment device with a decomposition effect, it achieves the recycling of ammonia, effectively prevents the harm caused by the direct discharge of ammonia and hydrogen into the air, and has high-quality tail gas treatment function and environmental protection effect.

[0039] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A material corrosion testing system based on a complex environment of high-temperature ammonia decomposition, comprising: Corrosive medium configuration mechanism, corrosive environment control mechanism and corrosive reaction mechanism; characterized by: The corrosive medium configuration mechanism includes a gas cylinder, a gas pressure stabilizing device, and a feeding device; the gas cylinder is connected to the gas pressure stabilizing device, which is in turn connected to the feeding device; the feeding device is used to deliver gas and abrasive to the corrosive reaction mechanism; The corrosion environment control mechanism is a control operation box, and the control operation box is electrically connected to the gas pressure stabilizing device and the feeding device at the same time; The corrosion reaction mechanism includes a stress stretching device, a high-temperature ammonia decomposition stress corrosion device, a high-temperature ammonia decomposition chemical corrosion device, and an ammonia tail gas treatment device. The high-temperature ammonia decomposition stress corrosion device and the high-temperature ammonia decomposition chemical corrosion device are separately arranged; the high-temperature ammonia decomposition stress corrosion device is located in the middle of the stress stretching device; a sample support frame is fixed in the high-temperature ammonia decomposition chemical corrosion device, and a plurality of mesh discs are provided on the sample support frame, and a plurality of sample slots are also fixed on the mesh disc; The high-temperature ammonia decomposition stress corrosion device is connected to a first heating device, and the high-temperature ammonia decomposition chemical corrosion device is connected to a second heating device. The first heating device and the second heating device are both electrically connected to the control operation box; the feeding device is simultaneously connected to the inlet of the high-temperature ammonia decomposition stress corrosion device and the inlet of the high-temperature ammonia decomposition chemical corrosion device, and the outlet of the high-temperature ammonia decomposition stress corrosion device and the outlet of the high-temperature ammonia decomposition chemical corrosion device are simultaneously connected to the ammonia tail gas treatment device.

2. The material corrosion testing system based on a complex environment of high-temperature ammonia decomposition according to claim 1 is characterized by: The gas cylinder includes a nitrogen cylinder and an ammonia cylinder which are separately arranged, and the nitrogen cylinder and the ammonia cylinder are simultaneously connected to the gas pressure stabilizing device; a flow meter and a one-way valve are sequentially arranged in series between the gas pressure stabilizing device and the feeding device; the flow meter is electrically connected to the operation control box; the feeding device includes a material pump and a feed port, the material pump is directly connected to the feed port, and the material pump is electrically connected to the control operation box.

3. The material corrosion testing system based on a high-temperature ammonia decomposition complex environment according to claim 1 is characterized by: The high-temperature ammonia decomposition stress corrosion device is located inside the first heating device and is in direct contact with the first heating device. Both ends of the high-temperature ammonia decomposition stress corrosion device are also connected to the stress stretching device. The opening of the high-temperature ammonia decomposition stress corrosion device is connected to the feeding device. The first heating device is a five-stage heating furnace, which can heat different positions inside the high-temperature ammonia decomposition stress corrosion device. The first heating device is electrically connected to the operation control box.

4. The material corrosion testing system based on a high-temperature ammonia decomposition complex environment according to claim 1 is characterized by: A flange interface is provided on the top of the high-temperature ammonia decomposition chemical corrosion device; the sample support frame includes a sample support rod and multiple mesh discs, and multiple disc slots are opened on the outer wall of the sample support rod. The multiple disc slots are distributed at intervals on the outer wall of the sample support rod, and the multiple disc slots are used to fix the corresponding mesh discs.

5. The material corrosion testing system based on a high-temperature ammonia decomposition complex environment according to claim 4 is characterized by: The mesh disc is provided with a disc buckle, which is used to adjust the opening and closing degree of the mesh disc; a plurality of sample slots are fixed on the edge of the mesh disc, and the sample slots are composed of a sample slot interlayer and a sample slot fixing clamp.

6. The material corrosion testing system based on a high-temperature ammonia decomposition complex environment according to claim 4 is characterized by: The high-temperature ammonia decomposition chemical etching device is fixed inside the second heating device, the second heating device is a five-stage heating furnace, and the second heating device is electrically connected to the operation control box.

7. The material corrosion testing system based on a high-temperature ammonia decomposition complex environment according to claim 1 is characterized by: It also includes an ammonia tail gas treatment device, which is equipped with an ammonia decomposition reaction tube and an ammonia decomposition heating furnace. The ammonia decomposition heating furnace is arranged outside the ammonia decomposition reaction tube and is fixedly connected to the outer wall of the ammonia decomposition reaction tube; the two ends of the ammonia decomposition reaction tube are respectively connected to the ammonia inlet and the decomposition gas outlet of the ammonia tail gas treatment device; the ammonia inlet of the ammonia tail gas treatment device is simultaneously connected to the outlet of the high-temperature ammonia decomposition chemical corrosion device and the outlet of the high-temperature ammonia decomposition stress corrosion device.

8. The material corrosion testing system based on a high-temperature ammonia decomposition complex environment according to claim 7, characterized in that: The ammonia decomposition reaction tube is filled with an ammonia decomposition catalyst, which is a ruthenium-based catalyst or a nickel-based catalyst; the ammonia tail gas treatment device is also provided with a pressure gauge and a control panel.

9. The material corrosion testing system based on a high-temperature ammonia decomposition complex environment according to claim 7, characterized in that: The outlet end of the ammonia tail gas treatment device is connected to an air condenser, and the outlet end of the air condenser is connected to a stop valve and a back pressure valve, and the back pressure valve is further connected to a pressure sensor and a tail gas absorption device.

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