Material corrosion testing system based on high-temperature ammonia decomposition complex environment

Abstract

The invention relates to a material corrosion testing system based on a high-temperature ammonia decomposition complex environment. The material corrosion testing system comprises a corrosion medium configuration mechanism, a corrosion environment control mechanism and a corrosion reaction mechanism, the corrosive medium configuration system comprises a gas cylinder, a gas pressure stabilizing device and a feeding device which are connected in sequence; the corrosion environment control system is a control operation box; the control operation box is connected with the gas pressure stabilizing device and the feeding device; the corrosion 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 with the feeding device and the ammonia tail gas treatment device; the material corrosion test system based on the high-temperature ammonia decomposition complex environment can adjust components, temperature, pressure and flow velocity of a corrosion medium according to requirements, and stress and chemical corrosion test and evaluation of various samples are realized at the same time.

Description

Technical Field

[0001] The invention relates to the field of corrosion mechanical performance 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 rapid development stage, and solving the supply and demand mismatch problem in time and space has become the key to breaking through the industrial bottleneck in the hydrogen storage and transportation link. 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 flammable and explosive properties, 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 lower production costs. Third, the storage cost of liquid ammonia is significantly lower, and the 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 production of hydrogen by 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 for research. Therefore, a corrosion test platform for multiple types of materials in the complex environment of high-temperature ammonia decomposition is urgently needed. Summary of the invention

[0003] In view of the defects of the ammonia decomposition hydrogen production process in the prior art, 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 fully and accurately simulate and verify the corrosion of ammonia on different materials in a complex environment; a material corrosion testing system based on the complex environment of high-temperature ammonia decomposition is provided, which can accurately simulate the corrosion conditions of different types of materials in a high-temperature ammonia decomposition environment, can detect the influence of different parameters on the corrosion effect of ammonia, has a wide range of use, and is easy to operate.

[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, and the gas pressure stabilizing device is further connected to the feeding device; the feeding device is used to transport gas and abrasive to the corrosion 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 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, a plurality of mesh discs are arranged 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, 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 is directly connected to the feed port, 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 a plurality of mesh discs, a plurality of disc slots are provided on the outer wall of the sample support rod, and the plurality of disc slots are distributed at intervals on the outer wall of the sample support rod, and the plurality of disc slots are used to correspond to and fix the 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 arranged inside the ammonia tail gas treatment device. 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.

[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 with an air condenser, the outlet of the air condenser is connected with a stop valve and a back pressure valve, and the back pressure valve is further connected with 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 arranging a stress stretching device and a high-temperature ammonia decomposition stress corrosion device, and arranging a plurality of mesh discs with adjustable heights in the high-temperature ammonia decomposition chemical corrosion device, combined with a plurality of 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 synchronization 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 drawings required for use in the specific embodiments will be briefly introduced below. 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 creative work.

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

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

[0018] Figure 4 It 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 It 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 It 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 It is a schematic structural diagram of a C-type 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 It is a structural schematic 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] Fig. 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 described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 corrosion medium configuration mechanism, a corrosion environment control mechanism and a corrosion reaction mechanism;

[0026] The corrosive medium configuration mechanism comprises 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, and the gas pressure stabilizing device 19 is further connected to the feeding device; the feeding device is used to transport 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 at the same time;

[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, wherein 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, a plurality of mesh discs 26 are arranged on the sample support frame 8, and 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 connected to the gas pressure stabilizing device 19 at the same time; hydrogen and nitrogen are mixed according to 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 the 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 operating box 9; In order to detect the flow rate and pressure of the gas discharged from the gas pressure stabilizing device 19, while ensuring the flow direction of the gas and reducing 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 gas and nitrogen gas after voltage 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; used for testing the corrosion effect of ammonia gas; in the process of introducing gas and solid, the control operation box 9 detects the flow meter 2 to Control the flow rate of the 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; used for subsequent simulation and testing of ammonia corrosion in a high-temperature environment; by setting nitrogen bottles and hydrogen bottles at the same time and adjusting the concentration ratio of ammonia and nitrogen, and 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 high-temperature ammonia decomposition conditions, 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 pressure 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 pressure corrosion device 6 for corrosion testing; wherein, the first heating device 17 is a five-stage heating furnace, and the five-stage 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 gas heating decomposition are controlled, so as to test the corrosion test of the sample in the 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 corrosion 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 corrosion 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, 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 the relative position of the mesh disc 26 on the sample support rod 21 is adjusted by correspondingly embedding the mesh disc 26 in each disc slot 25, 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, so as to realize the 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 is composed of a sample slot interlayer 23 and a sample slot fixing clamp 24, wherein 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 toward 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, and 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 Figure 5 to Figure 7 As shown, the sample types include a sheet sample 27, a tensile sample 28, a fatigue sample 31 and a C-ring sample 30; wherein the sheet sample 27 and the tensile sample 28 are placed in the sample slot 20 on the mesh disc 26, and the fatigue sample 31 and the C-ring sample 30 are directly placed on the mesh disc 26, so that high-temperature ammonia decomposition corrosion test can be carried out on multiple types of samples simultaneously.

[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 disk 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 testing conditions under different conditions; the reacted gas 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 corrosion 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 corrosion device so as to be absorbed by the tail gas absorption device; Figure 8 and Fig. 9 As shown, the ammonia tail gas treatment device 15 is provided with an ammonia decomposition reaction tube 34 and an ammonia decomposition heating furnace 35, the ammonia decomposition heating furnace 35 is sleeved outside the ammonia decomposition reaction tube 34 and is 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 with 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 with the outlet of the high-temperature ammonia decomposition chemical corrosion 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; the remaining ammonia is fully treated to 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. 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 then 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 also 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 to ensure the stable decomposition of ammonia in the ammonia tail gas treatment device 15.

[0036] In order to further absorb 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 been 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, thereby 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 arranging a stress stretching device and a high-temperature ammonia decomposition stress corrosion device, and arranging a plurality of mesh discs with adjustable heights in the high-temperature ammonia decomposition chemical corrosion device, combined with a plurality of 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 synchronization 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 the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still 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 in that: 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, and the gas pressure stabilizing device is further connected to the feeding device; the feeding device is used to transport 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 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, wherein the high-temperature ammonia decomposition stress corrosion 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, a plurality of mesh discs are arranged 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. 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. According to claim 1, a material corrosion testing system based on a complex environment of high temperature ammonia decomposition 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 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 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. According to claim 1, a material corrosion testing system based on a complex environment of high temperature ammonia decomposition 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. According to claim 1, a material corrosion testing system based on a complex environment of high temperature ammonia decomposition 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 a plurality of mesh discs, a plurality of disc slots are provided on the outer wall of the sample support rod, and the plurality of disc slots are distributed at intervals on the outer wall of the sample support rod, and the plurality of disc slots are used to fix the mesh discs accordingly.

5. A material corrosion testing system based on a complex environment of high temperature ammonia decomposition according to claim 4, characterized in that: The mesh disc is provided with a disc buckle, 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.

6. A material corrosion testing system based on a high temperature ammonia decomposition complex environment according to claim 4, characterized in that: 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 high temperature ammonia decomposition complex environment according to claim 1 is characterized by: It also includes an ammonia tail gas treatment device, wherein an ammonia decomposition reaction tube and an ammonia decomposition heating furnace are arranged inside the ammonia tail gas treatment device, and 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. A 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 high temperature ammonia decomposition complex environment according to claim 7 is characterized by: The outlet end of the ammonia tail gas treatment device is connected with an air condenser, and the outlet end of the air condenser is connected with a stop valve and a back pressure valve, and the back pressure valve is further connected with a pressure sensor and a tail gas absorption device.

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