Multifunctional ammonia corrosion performance testing system

Abstract

The invention discloses a multifunctional ammonia corrosion performance testing system which comprises an ammonia gas supply mechanism, a nitrogen gas supply mechanism, a first heat exchanger, a testing section, an ammonia decomposition reactor, a second heat exchanger and a gas storage mechanism. The ammonia gas supply mechanism and the nitrogen gas supply mechanism are connected in parallel to the first heat exchanger, and the test section is formed by connecting a plurality of test sections with different sectional areas in series and is connected with the first temperature control box. The ammonia decomposition reactor is formed by connecting a plurality of reaction sections with different sectional areas in series and is filled with an ammonia decomposition catalyst, the reaction sections are connected with the second temperature control box, and a flue gas pipeline is sleeved outside the reaction sections. The decomposed gas outlet is connected with the second heat exchanger for heat exchange between the gas and the cooling medium and is finally connected with the gas storage mechanism. Through the variable-diameter test section and the bending variable-diameter ammonia decomposition reactor, the corrosion performance under different temperatures, flow rates and ammonia conversion rates is simulated, the test accuracy and the energy utilization rate are improved, the interference of unstable factors is reduced, and the efficient operation of the system is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia corrosion test equipment, and particularly relates to a multifunctional ammonia corrosion performance test system. Background Art

[0002] Ammonia (NH3), as an important industrial raw material, is widely used in fields such as refrigeration, chemical industry, chemical fertilizers, and electric power. However, ammonia has strong corrosiveness. Especially in high-temperature, high-pressure, or humid environments, it can cause serious corrosion damage to metal materials (such as copper, steel, aluminum, etc.) and non-metal materials (such as rubber, plastics, etc.), resulting in equipment failure, safety hazards, and environmental pollution. Ammonia corrosion is also a serious problem faced by many industrial fields, such as refrigeration, chemical industry, and electric power. Ammonia corrosion can lead to equipment failure, safety hazards, and environmental pollution. Therefore, it is crucial to develop an effective ammonia corrosion performance test system. Currently, the existing ammonia corrosion performance test technologies mainly have the following problems: Single function: The existing test systems usually can only perform a single type of test, such as static immersion test or electrochemical test, and cannot comprehensively evaluate the ammonia corrosion performance of materials under different conditions. Limited test conditions: It is difficult for the existing systems to precisely control the test environment, such as temperature, pressure, ammonia concentration, etc., resulting in a deviation between the test results and the actual working conditions. Summary of the Invention

[0003] In view of the defects in the existing ammonia corrosion test system, such as single function and low accuracy in testing, a multifunctional ammonia corrosion test system is provided, which can realize the ammonia corrosion performance test under different working conditions and can accurately control and compare various parameters during the test process.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: a multifunctional ammonia corrosion performance test system, including an ammonia supply mechanism, a nitrogen supply mechanism, a first heat exchanger, a test section, an ammonia decomposition reactor, a second heat exchanger, and a gas storage mechanism; the ammonia supply mechanism and the nitrogen supply mechanism are arranged in parallel, and the ammonia supply mechanism and the nitrogen supply mechanism are simultaneously connected to the first heat exchanger; the first heat exchanger is further connected to the test section, the test section includes a plurality of test intervals, each test interval is connected in series in sequence, and the cross-sectional areas of each test interval are different from each other; the test interval is connected to the first temperature control box; the ammonia decomposition reactor includes a plurality of reaction sections with different cross-sectional areas, and the plurality of reaction sections are connected in series in sequence, one end of one of the reaction sections is the ammonia inlet, and one end of one of the reaction sections is the decomposed gas outlet; an ammonia decomposition catalyst is filled in each reaction section, and the ammonia decomposition conversion rates in each reaction section are different, and the test section is connected in series with the ammonia inlet; the reaction section is connected to the second temperature control box; a flue gas pipeline is sleeved outside the ammonia decomposition reactor; the decomposed gas outlet is connected to the second heat exchanger, and the second heat exchanger is connected to the cooling mechanism; the second heat exchanger can exchange heat between the gas discharged from the decomposed gas outlet and the medium introduced from the cooling mechanism; the second heat exchanger is further connected to the gas storage mechanism.

[0005] Further, the ammonia supply mechanism includes an ammonia tank, an ammonia pressure reducing valve, an ammonia pressure transmitter, an ammonia flow meter, and an ammonia shut-off valve; the ammonia tank is sequentially connected to the ammonia pressure reducing valve, the ammonia pressure transmitter, the ammonia flow meter, and the ammonia shut-off valve; the nitrogen supply mechanism includes a nitrogen tank, a nitrogen pressure reducing valve, a nitrogen pressure transmitter, a nitrogen flow meter, and a nitrogen shut-off valve; the nitrogen tank is sequentially connected to the nitrogen pressure reducing valve, the nitrogen pressure transmitter, the nitrogen flow meter, and the nitrogen shut-off valve; the ammonia shut-off valve and the nitrogen shut-off valve are simultaneously connected to the first heat exchanger.

[0006] Further, the ammonia decomposition reactor is a coiled pipe structure, one end of the ammonia decomposition reactor is the ammonia inlet, the other end of the ammonia decomposition reactor is the decomposed gas outlet, the ammonia inlet is arranged facing the outside of the ammonia decomposition reactor, the decomposed gas outlet is arranged facing the center close to the ammonia decomposition reactor, and the ammonia decomposition reactor is spirally arranged starting from the ammonia inlet and towards the direction close to the decomposed gas outlet.

[0007] Further, the ammonia decomposition reactor is composed of a first reaction section, a second reaction section, and a third reaction section connected in sequence. The first reaction section, the second reaction section, and the third reaction section are all bent pipe structures. The pipe diameter of the first reaction section is larger than the pipe diameter of the second reaction section, and the pipe diameter of the second reaction section is larger than the pipe diameter of the third reaction section. There is a first gap between the first reaction section and the second reaction section, and there is a second gap between the second reaction section and the third reaction section; the same ammonia decomposition catalyst is filled in the first reaction section, the second reaction section, and the third reaction section; the first gap is larger than the second gap.

[0008] Further, the structure of the flue gas pipeline corresponds to that of the ammonia decomposition reactor. The diameters of all parts of the flue gas pipeline are equal to each other, and there is a gap between the outer walls of the flue gas pipeline and the ammonia decomposition reactor.

[0009] Further, the second heat exchanger is connected to a cooling mechanism. The cooling mechanism includes a cooling water tower and a circulating water pump. The circulating water pump and the cooling water tower are connected in series, and the cooling water tower is directly connected to the second heat exchanger.

[0010] Further, a first branch is provided between the ammonia decomposition reactor and the second heat exchanger. The first branch is directly connected to the first heat exchanger. A first valve is provided on the first branch, and a third valve is provided between the ammonia decomposition reactor and the second heat exchanger.

[0011] Further, a second branch is provided on the first branch. The second branch is also connected to the second heat exchanger. A second valve is provided on the second branch.

[0012] Further, a pH detection device is provided at the decomposition gas outlet of the ammonia decomposition reactor. When the pH detection result shows that the gas is alkaline, the third valve is opened and the first valve is maintained closed to prevent the gas from directly entering the first heat exchanger. At the same time, the first temperature control box is turned on. When the pH detection result shows that the gas is neutral or acidic, the first valve is opened to introduce the gas into the first heat exchanger.

[0013] Further, it also includes a burner. The combustion outlet of the burner is connected to the flue gas pipeline. The gas storage mechanism includes a buffer tank, a dilution tank, a drying tank, and a hydrogen storage device. The buffer tank, the dilution tank, the drying tank, and the hydrogen storage device are connected in series in sequence. The hydrogen storage device is connected to the combustion inlet of the burner.

[0014] A multifunctional ammonia corrosion performance test system described in the present invention comprehensively and accurately simulates the ammonia conversion rate under different environmental atmospheres, external temperatures, gas flow rates, and different ammonia conversion rates by adopting a variable-diameter test section and an ammonia decomposition reactor with variable diameter, bending, and unequal spacing. The effects of multiple parameters can be analyzed simultaneously, and during the test, situations such as uneven heating caused by changes in flow rate and insufficient local decomposition of ammonia are avoided, which is beneficial to the overall control and test accuracy of the system; it reduces the influence and interference caused by unstable factors during the test; during the operation of the same system, through the effective utilization and control of the heat of the decomposed gas, while ensuring the safety of the system operation, the energy consumption of the system is effectively reduced, and the energy reuse rate of the system is improved. Description of the Drawings

[0015] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings required for the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of a multifunctional ammonia corrosion performance test system according to the present invention;

[0017] Figure 2 It is a schematic structural diagram of a test section of a multifunctional ammonia corrosion performance test system according to the present invention;

[0018] Figure 3 It is a schematic structural diagram of another test section of a multifunctional ammonia corrosion performance test system according to the present invention;

[0019] Figure 4 It is a schematic structural diagram of an ammonia decomposition reactor of a multifunctional ammonia corrosion performance test system according to the present invention. Specific Embodiments

[0020] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0021] As Figures 1 to 4 shown, a multifunctional ammonia corrosion performance test system according to the present invention includes an ammonia supply mechanism, a nitrogen supply mechanism, a first heat exchanger 2, a test section 3, an ammonia decomposition reactor 4, a second heat exchanger 5, and a gas storage mechanism;

[0022] The ammonia supply mechanism and the nitrogen supply mechanism are arranged in parallel, and the ammonia supply mechanism and the nitrogen supply mechanism are simultaneously connected to the first heat exchanger 2; the first heat exchanger 2 is further connected to the test section 3. The test section 3 includes a plurality of test intervals 31, and each test interval 31 is connected in series in sequence, and the cross-sectional areas of each test interval 31 are different from each other; the test interval 31 is connected to a first temperature control box 14;

[0023] The ammonia decomposition reactor 4 includes a plurality of reaction sections with different cross-sectional areas, and the plurality of reaction sections are connected in series in sequence. One end of one reaction section is the ammonia inlet, and one end of one reaction section is the decomposed gas outlet; an ammonia decomposition catalyst is filled in each reaction section, and the ammonia decomposition conversion rates in each reaction section are different. The test section 3 is connected in series with the ammonia inlet; the reaction section is connected to the second temperature control box 13; a flue gas pipe with the same diameter is sleeved on the ammonia decomposition reactor 4.

[0024] The decomposed gas outlet is connected to the second heat exchanger, and the second heat exchanger is connected to a cooling mechanism; the second heat exchanger can exchange heat between the gas discharged from the decomposed gas outlet and the medium introduced from the cooling mechanism; the second heat exchanger is then connected to the gas storage mechanism.

[0025] As Figure 1 shown, the ammonia supply mechanism includes an ammonia tank 1, an ammonia pressure reducing valve 16, an ammonia pressure transmitter 17, an ammonia flowmeter 18, and an ammonia on-off valve 19; the ammonia tank 1 is sequentially connected to the ammonia pressure reducing valve 16, the ammonia pressure transmitter 17, the ammonia flowmeter 18, and the ammonia on-off valve 19; the ammonia flowmeter 18 is used to detect the ammonia flow rate in the ammonia supply mechanism, and then according to the detection result of the flowmeter 18, the flow rate of the ammonia discharged from the ammonia tank 1 is controlled by adjusting the pressure reducing valve 16 and the pressure transmitter 17; then the flow rate of the ammonia discharged from the ammonia tank 1 is controlled by opening or closing the on-off valve 19; similarly, the nitrogen supply mechanism includes a nitrogen tank 15, a nitrogen pressure reducing valve A1, a nitrogen pressure transmitter A2, a nitrogen flowmeter A3, and a nitrogen on-off valve; the nitrogen tank 15 is sequentially connected to the nitrogen pressure reducing valve A1, the nitrogen pressure transmitter A2, the nitrogen flowmeter A3, and the nitrogen on-off valve; the nitrogen flowmeter A3 is used to detect the nitrogen flow rate in the nitrogen supply mechanism, and then according to the detection result of the nitrogen flowmeter A3, the flow rate of the nitrogen discharged from the nitrogen tank 1 is controlled by adjusting the nitrogen pressure reducing valve A1 and the nitrogen pressure transmitter A2; then the flow rate of the nitrogen discharged from the nitrogen tank 1 is controlled by opening or closing the nitrogen on-off valve; the ammonia supply mechanism and the nitrogen supply mechanism are arranged in parallel and are simultaneously connected to the first heat exchanger 2; by correspondingly adjusting the opening degrees of the ammonia on-off valve and the nitrogen on-off valve, the volume ratio of ammonia and nitrogen entering the first heat exchanger 2 is controlled; thereby verifying the influence of ammonia corrosion on the specimen under different ammonia-nitrogen ratios; better simulating the ammonia corrosion effect under different environments, such as different ammonia-nitrogen ratios; improving the test diversity of the system.

[0026] As Figure 1 and Figure 2As shown, the other end of the first heat exchanger 2 is connected to the test section 3. The first heat exchanger 2 can heat the gases introduced from the ammonia supply mechanism and the nitrogen supply mechanism to increase the temperature entering the test section 3; as Figure 2 As shown, the test section 3 is a long strip structure. The test section 3 includes five test intervals 31, and the five test intervals 31 are connected in series in sequence. The cross-sectional areas of each of the test intervals 31 are different from each other. Test specimens are installed in each of the test intervals 31. By connecting the test intervals 31 with different cross-sectional areas in series, the flow rate of ammonia in each test interval 31 is adjusted, so as to verify the corrosion effect under different ammonia flow rates; moreover, the test intervals 31 with different cross-sectional areas are connected in series, which also enables the ammonia corrosion results in different test intervals 31 to be compared horizontally and the corrosion tests under different flow rates to be carried out synchronously, improving the functional diversity of the test system; preferably, the test section 3 is also connected to the first temperature control box 14, and each test interval 31 on the test section 3 is correspondingly connected to the first temperature control box 14. The first temperature control box 14 can heat each test interval 31 separately and detect the test temperature in each test interval 31; to explore the ammonia corrosion performance under different flow rates; and by heating each test interval 31 separately, it can also make up for the heat loss generated when ammonia flows in the test section 3, that is, when testing the corrosion effect of different ammonia flow rates, the temperature loss caused by flow can be reduced, the variables in the test process can be reduced, the accuracy of the test system is improved, and the diversity of the test system is also improved, and the ammonia corrosion effect under different test environments can be simulated.

[0027] As Figure 3 As shown, the test section 3 is a long strip structure. The test section 3 includes three test intervals 31 with the same cross-sectional area, and the three test intervals 31 with the same cross-sectional area are connected in sequence. Each test interval 31 is connected to the first temperature control box 14; the first temperature control box 14 can heat each test interval 31 separately and detect the test temperature in each test interval 31; to explore the ammonia corrosion performance under different bed temperatures.

[0028] The test section 3 is connected to the ammonia decomposition reactor 4, as Figure 3As shown, the ammonia decomposition reactor 4 is a coiled pipe structure. One end of the ammonia decomposition reactor 4 is the ammonia inlet, and the other end is the decomposed gas outlet. The ammonia inlet is arranged facing the outside of the ammonia decomposition reactor 4, while the decomposed gas outlet is arranged facing the center close to the ammonia decomposition reactor 4. The ammonia decomposition reactor 4 is spirally arranged starting from the ammonia inlet and towards the direction close to the decomposed gas outlet. Specifically, the ammonia decomposition reactor 4 is composed of a first reaction section 41, a second reaction section 42, and a third reaction section 43 connected in sequence. The first reaction section 41, the second reaction section 42, and the third reaction section 43 are all bent pipe structures. The pipe diameter of the first reaction section 41 is larger than that of the second reaction section 42, and the pipe diameter of the second reaction section 42 is larger than that of the third reaction section 43. There is a first gap between the first reaction section 41 and the second reaction section 42, and a second gap between the second reaction section 42 and the third reaction section 43. The same ammonia decomposition catalyst, such as ruthenium-based catalyst or nickel-based catalyst, is filled in the first reaction section 41, the second reaction section 42, and the third reaction section 43. In order to effectively heat the ammonia in each reaction section sufficiently and monitor the heating process, specifically, the ammonia decomposition reactor 4 is connected to the second temperature control box 13, and each reaction section of the ammonia decomposition reactor 4 is connected to the second temperature control box 13. The second temperature control box 13 can detect the temperature in each reaction section. Test specimens are arranged in the first reaction section 41, the second reaction section 42, and the third reaction section 43 to explore the ammonia corrosion performance under different ammonia decomposition conversion rates. Among them, a flue gas pipe is sleeved outside the ammonia decomposition reactor 4. The structure of the flue gas pipe corresponds to the structure of the ammonia decomposition reactor 4. The diameters of all parts of the flue gas pipe are equal to each other. The flue gas pipe completely covers the first reaction section 41, the second reaction section 42, and the third reaction section 43. There is a gap between the outer wall of the flue gas pipe and the ammonia decomposition reactor 4. The gap between the flue gas pipe and the ammonia decomposition reactor 4 is used for the flow of high-temperature gas to achieve the heating of the ammonia inside the ammonia decomposition reactor 4, that is, inside the first reaction section 41, the second reaction section 42, and the third reaction section 43. At this time, since there are gaps of different sizes between the first reaction section 41, the second reaction section 42, and the third reaction section 43, that is, the first gap is larger than the second gap, and at the same time the diameter of the first reaction section 41 is larger than the diameter of the second reaction section 42, and the diameter of the second reaction section 42 is larger than the diameter of the third reaction section 43;A volume gradient is formed inside the ammonia decomposition reactor 4. When the gas flows rapidly in the first reaction section 41 and enters the second reaction section 42 and the third reaction section 43, it compresses the gas and enhances the interaction force, which is conducive to the full contact of ammonia with the catalyst in each corresponding reaction section, achieving accurate control of the ammonia decomposition efficiency in each reaction section and realizing the comprehensive verification of the corrosion effect of the mixed gas under different flow rates and different ammonia decomposition efficiencies. Similarly, by adopting the above non-uniform spacing structural design, the heat of the flue gas in the flue gas pipeline can be stably and balancedly transferred to the ammonia flowing synchronously in the ammonia decomposition reactor 4, enabling the ammonia in each reaction section to stably absorb heat and react, reducing the temperature fluctuation caused by the change in the internal diameter of the ammonia decomposition reactor 4, and improving the accuracy of system testing. More specifically, the flue gas pipeline with a constant diameter has the advantage of being easy to process compared to the variable diameter flue gas pipeline.

[0029] The multifunctional ammonia corrosion performance testing system further includes a burner 11. The combustion inlet of the burner 11 is connected to the hydrogen storage device in the gas storage mechanism, and the combustion outlet of the burner 11 is communicated with the flue gas pipeline. The hydrogen storage device is used to provide fuel for the burner 11 to burn, and the gas after combustion in the burner 11 enters the flue gas pipeline to provide heat for ammonia decomposition.

[0030] The decomposition gas outlet of the ammonia decomposition reactor 4 is connected to the second heat exchanger 5, and the second heat exchanger 5 is further connected to the cooling mechanism. The cooling mechanism includes a cooling water tower 12 and a circulation water pump 10. The circulation water pump 10 is connected in series with the cooling water tower 12, and the cooling water tower 12 is directly communicated with the second heat exchanger 5. The circulation water pump 10 can provide power for the flow of cooling water to drive the cooling water to circulate between the cooling water tower 12 and the second heat exchanger 5. The second heat exchanger 5 can exchange heat between the decomposition gas discharged from the ammonia decomposition reactor 4 and the liquid water discharged from the cooling water tower 12 to reduce the temperature of the decomposition gas discharged from the ammonia decomposition reactor 4. The gas storage mechanism includes a buffer tank 6, a dilution tank 7, a drying tank 8, and a hydrogen storage device 9. The buffer tank 6, the dilution tank 7, and the drying tank 8 are used to adjust the pressure, dilute, and dry the decomposed gas after temperature reduction in sequence, so that the decomposed gas after cooling meets the storage conditions. Specifically, the second heat exchanger 5 is connected to the buffer tank 6, and a pressure transmitter and a decomposition gas valve are arranged between the second heat exchanger 5 and the buffer tank 6 to better adjust the pressure of the decomposed gas after heat exchange and subsequent gas storage.

[0031] In order to improve the energy utilization rate in the system and reduce the energy consumption in the system while achieving accurate detection; preferably, a first branch is provided between the decomposition gas outlet of the ammonia decomposition reactor 4 and the second heat exchanger 5, and the first branch is directly connected to the first heat exchanger 2. The decomposition gas discharged from the ammonia decomposition reactor 4 is diverted through the first branch and enters the first heat exchanger 2 to preheat the gas introduced from the ammonia supply mechanism and the nitrogen supply mechanism by using its own heat, reducing the heat required to heat ammonia in the system and making better use of the heat generated during the detection process; reducing the energy consumption loss of the sample in the long-term high-temperature environment of the test section and each reaction section; after heat exchange, the decomposition gas is discharged from the first heat exchanger 2 and then flows back to the second heat exchanger 5 to exchange heat with cooling water; while realizing the effective reuse of the heat of the decomposition gas, it also achieves the effective recovery of the decomposition gas, reducing the gas loss during the system detection process; after heat exchange in the second heat exchanger 5, the decomposed gas continues to pass through the buffer tank 6, the dilution tank 7 and the drying tank 8 for buffering, dilution and drying, and then enters the hydrogen storage device 9 for storage.

[0032] In order to effectively control the temperature in the system, more accurately control the temperature of the ammonia gas entering the test section 3, and reduce the heating requirement of the first temperature control box 14, preferably, a second branch is provided on the first branch, and the second branch is also connected to the second heat exchanger 5. The second branch is used to divert a part of the gas discharged from the ammonia decomposition reactor 4, and the diverted gas continues to flow back into the second heat exchanger 5; to control the gas volume of the mixed gas with a higher temperature entering the first heat exchanger 2, so as to control the heating of ammonia gas in the first heat exchanger 2 and effectively verify the corrosion performance of ammonia gas at different temperatures; specifically, a first valve B1 is provided on the first branch, a second valve B2 is provided on the second branch, and a third valve B3 is provided between the ammonia decomposition reactor 4 and the second heat exchanger 5. A fourth valve is provided between the first heat exchanger 2 and the second heat exchanger 5; by adjusting the opening degrees of the first valve B1, the second valve B2, and the third valve B3, the flow direction and the corresponding gas volume of the decomposed gas discharged from the ammonia decomposition reactor 4 are correspondingly controlled; to achieve the heat balance of ammonia gas heating and subsequent gas storage; among them, in order to reduce the corrosion of ammonia gas on the equipment during operation, improve the service life and safety of the equipment, preferably, a pH value detection device (not shown) is provided at the decomposition gas outlet of the ammonia decomposition reactor 4. According to the detection result of the pH value detection device, if the detection result shows that the gas is alkaline, it indicates that there is residual ammonia gas in the gas. Therefore, the third valve B3 is opened and the first valve B1 is maintained closed, so that the decomposed gas preferentially enters the second heat exchanger 5 for cooling and then enters the gas storage mechanism for gas storage; to avoid the residual ammonia gas in the gas directly entering the first heat exchanger 2 and corroding and damaging the first heat exchanger 2. At the same time, the first temperature control box 14 is turned on, and the ammonia gas corrosion test in the test section 3 is carried out by means of electric heating; until the internal temperature of the ammonia decomposition reactor 4 continues to rise and the ammonia gas in it fully reacts, then the first valve B1 is opened, so that part of the high-temperature decomposed gas enters the first heat exchanger 2 through the first valve B1 to heat the ammonia gas; thus achieving the effective utilization of the system energy during the ammonia corrosion test and reducing the energy consumption of the system.

[0033] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A multi-functional ammonia corrosion performance test system, comprising an ammonia supply mechanism, a nitrogen supply mechanism, a first heat exchanger, a test section, an ammonia decomposition reactor, a second heat exchanger and a gas storage mechanism; characterized in that: The ammonia supply mechanism and the nitrogen supply mechanism are arranged in parallel, and the ammonia supply mechanism and the nitrogen supply mechanism are simultaneously connected to the first heat exchanger; the first heat exchanger is further connected to the test section, and the test section includes a plurality of test intervals, each test interval is connected in series in turn, and the cross-sectional areas of each test interval are different from each other; the test interval is connected to a first temperature control box; The ammonia decomposition reactor includes a plurality of reaction sections with different cross-sectional areas, and the plurality of reaction sections are connected in series in turn. One end of one reaction section is an ammonia inlet, and one end of one reaction section is a decomposed gas outlet; each reaction section is filled with an ammonia decomposition catalyst, and the ammonia decomposition conversion rates in each reaction section are different. The test section is connected in series with the ammonia inlet; the reaction section is connected to a second temperature control box; a flue gas pipe is sleeved outside the ammonia decomposition reactor; The decomposed gas outlet is connected to the second heat exchanger, and the second heat exchanger is connected to a cooling mechanism; the second heat exchanger can exchange heat between the gas discharged from the decomposed gas outlet and the medium introduced from the cooling mechanism; the second heat exchanger is further connected to the gas storage mechanism.

2. The multifunctional ammonia corrosion performance testing system according to claim 1, wherein: The ammonia supply mechanism includes an ammonia tank, an ammonia pressure reducing valve, an ammonia pressure transmitter, an ammonia flowmeter and an ammonia shut-off valve; the ammonia tank is sequentially connected to the ammonia pressure reducing valve, the ammonia pressure transmitter, the ammonia flowmeter and the ammonia shut-off valve; the nitrogen supply mechanism includes a nitrogen tank, a nitrogen pressure reducing valve, a nitrogen pressure transmitter, a nitrogen flowmeter and a nitrogen shut-off valve; the nitrogen tank is sequentially connected to the nitrogen pressure reducing valve, the nitrogen pressure transmitter, the nitrogen flowmeter and the nitrogen shut-off valve; the ammonia shut-off valve and the nitrogen shut-off valve are simultaneously connected to the first heat exchanger.

3. The multifunctional ammonia corrosion performance testing system according to claim 1, wherein: The ammonia decomposition reactor is a coiled pipe structure. One end of the ammonia decomposition reactor is an ammonia inlet, and the other end is a decomposed gas outlet. The ammonia inlet is arranged towards the outside of the ammonia decomposition reactor, and the decomposed gas outlet is arranged towards the center close to the ammonia decomposition reactor. The ammonia decomposition reactor is spirally arranged starting from the ammonia inlet towards the direction close to the decomposed gas outlet.

4. A multifunctional ammonia corrosion performance testing system according to claim 3, characterized in that: The ammonia decomposition reactor is composed of a first reaction section, a second reaction section, and a third reaction section connected in sequence. The first reaction section, the second reaction section, and the third reaction section are all curved pipe structures. The pipe diameter of the first reaction section is larger than that of the second reaction section, and the pipe diameter of the second reaction section is larger than that of the third reaction section. There is a first gap between the first reaction section and the second reaction section, and a second gap between the second reaction section and the third reaction section. The same ammonia decomposition catalyst is filled in the first reaction section, the second reaction section, and the third reaction section. The first gap is larger than the second gap.

5. The multifunctional ammonia corrosion performance testing system according to claim 1, wherein: The structure of the flue gas pipe corresponds to that of the ammonia decomposition reactor. The diameters of all parts of the flue gas pipe are equal to each other, and there is a gap between the outer wall of the flue gas pipe and the ammonia decomposition reactor.

6. The multifunctional ammonia corrosion performance test system according to claim 1, characterized in that: The second heat exchanger is connected to a cooling mechanism. The cooling mechanism includes a cooling water tower and a circulating water pump. The circulating water pump and the cooling water tower are connected in series, and the cooling water tower is directly connected to the second heat exchanger.

7. A multifunctional ammonia corrosion performance test system according to claim 1, characterized in that: A first branch is provided between the ammonia decomposition reactor and the second heat exchanger. The first branch is directly connected to the first heat exchanger. A first valve is provided on the first branch, and a third valve is provided between the ammonia decomposition reactor and the second heat exchanger.

8. A multifunctional ammonia corrosion performance test system according to claim 7, characterized in that: A second branch is provided on the first branch. The second branch is also connected to the second heat exchanger. A second valve B2 is provided on the second branch.

9. A multifunctional ammonia corrosion performance testing system according to claim 8, characterized in that: A pH detection device is provided at the decomposition gas outlet of the ammonia decomposition reactor. When the pH detection result shows that the gas is alkaline, open the third valve and keep the first valve closed to prevent the gas from directly entering the first heat exchanger. At the same time, turn on the first temperature control box. When the pH detection result shows that the gas is neutral or acidic, open the first valve to introduce the gas into the first heat exchanger.

10. A multifunctional ammonia corrosion performance testing system according to claim 1, characterized in that: It also includes a burner. The combustion outlet of the burner is connected to the flue gas pipe. The gas storage mechanism includes a buffer tank, a dilution tank, a drying tank, and a hydrogen storage device. The buffer tank, the dilution tank, the drying tank, and the hydrogen storage device are connected in series in sequence. The hydrogen storage device is connected to the combustion inlet of the burner.

Images