Ammonia cracking reaction test system and test method
By constructing an ammonia cracking reaction test system, the difficulties in testing the performance of ammonia cracking reaction devices and catalysts were solved, precise control of reaction conditions and detailed data analysis were achieved, and the performance of reaction devices and catalysts was optimized.
Patent Information
- Application Number
- CN202510596673.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-09
- Publication Date
- 2025-09-12
AI Technical Summary
The existing technology lacks solutions for detailed testing and analysis of ammonia cracking reaction devices and catalyst performance, and the application of microreactors in the field of ammonia cracking lacks experimental data for key parameter optimization and verification.
An ammonia cracking reaction test system is provided, which includes a temperature control module, an ammonia supply module, an ammonia cracking reaction module and an analysis module. By precisely controlling the reaction temperature and gas supply and analyzing the mixed gas composition, detailed testing of the ammonia cracking reaction device and catalyst performance can be achieved.
It ensures the stability and repeatability of reaction conditions, provides reliable experimental data, optimizes reaction devices and catalyst performance, and fills the gap in experimental data.
Smart Images
Figure CN120629461A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ammonia cracking reaction, and in particular to an ammonia cracking reaction testing system and a testing method. Background Art
[0002] Existing ammonia cracking technology suffers from drawbacks such as bulkiness, uneven heating, increased reverse reactions, and high energy consumption. While microreactors offer advantages such as efficient heat and mass transfer, their application in ammonia cracking is still in the design phase, lacking the extensive experimental and theoretical data necessary to optimize and validate key parameters such as the microreactor's flow field structure, catalyst carrier structure, and temperature control structure. Furthermore, while the improvement of ammonia cracking catalysts is a research hotspot, most development efforts, due to a lack of testing platforms, have limited validation to small quantities of powdered catalysts in small equipment such as tubular furnaces, which is not representative of large-scale, industrialized processes. Therefore, existing technologies lack solutions for detailed testing and analysis of ammonia cracking reaction devices or catalyst performance, as well as experimental data for ammonia cracking microreactions. There is an urgent need to develop a corresponding testing platform to obtain stable and reliable data. Summary of the Invention
[0003] The present invention provides an ammonia cracking reaction test system and test method, which can realize detailed test analysis of ammonia cracking reaction devices and catalyst performance and stability, thereby generating a large amount of low-cost ammonia cracking experimental data.
[0004] The present invention provides an ammonia cracking reaction test system, which includes a temperature control module, an ammonia supply module, an ammonia cracking reaction module, an inert gas supply module and an analysis module; The temperature control module is used to control the target temperature of the ammonia cracking reaction; The ammonia cracking reaction module is used to crack the ammonia output by the ammonia supply module in an environment of the target temperature to obtain a mixed gas after the reaction; The analysis module is used to analyze the components of the mixed gas and determine the ammonia cracking conversion rate based on the analysis results; The inert gas supply module is configured to stop supplying the inert gas to the ammonia cracking reaction module when the ammonia supply module outputs ammonia; and to supply the inert gas to the ammonia cracking reaction module when the ammonia supply module stops outputting ammonia.
[0005] Optionally, the temperature control module includes: A temperature detection unit, used to collect the real-time temperature of the ammonia cracking reaction module; A temperature control unit is used to compare the real-time temperature with the target temperature and heat the ammonia cracking reaction module according to the comparison result.
[0006] Optionally, the temperature control unit includes a first temperature control subunit and a second temperature control subunit; The temperature control unit is also used for: controlling a first temperature change rate by the first temperature control subunit and heating the ammonia cracking reaction module to a first target temperature; The second temperature change rate is controlled by the second temperature control subunit and the ammonia cracking reaction module is heated to a second target temperature.
[0007] Optionally, the ammonia supply module includes an ammonia source unit and a first flow control unit; The output end of the ammonia source unit is connected to the input end of the first flow control unit through a gas transmission pipeline, and the output end of the first flow control unit serves as the output end of the ammonia supply module and is connected to the input end of the ammonia cracking reaction module; The first flow control unit is used to adjust the flow of ammonia output to the ammonia cracking reaction module; The analysis module is used to determine the ammonia cracking conversion rate before and after the ammonia flow rate is adjusted.
[0008] Optionally, the ammonia supply module further includes a first filtering unit; The output end of the ammonia source unit is connected to the input end of the first filter unit, and the output end of the first filter unit is connected to the output end of the first flow control unit.
[0009] Optionally, the ammonia cracking reaction module includes an ammonia cracking reaction unit and a gas switching unit; The gas switching unit includes a switching valve and a gas transmission pipeline; When the switching valve is in the first switch state, one end of the gas transmission pipeline is used to input ammonia gas, and the other end of the gas transmission pipeline is connected to the input end of the ammonia cracking reaction unit, and ammonia gas is transmitted to the ammonia cracking reaction unit through the input end of the ammonia cracking reaction unit; When the switching valve is in the second switching state, one end of the gas transmission pipeline is used to input inert gas, and the other end of the gas transmission pipeline is connected to the input end of the ammonia cracking reaction unit, and the inert gas is transmitted to the ammonia cracking reaction unit through the input end of the ammonia cracking reaction unit.
[0010] Optionally, the ammonia cracking reaction test system further comprises a pressure sensing module, wherein the pressure sensing module comprises a plurality of air pressure sensors distributed in the system; Each of the air pressure sensors is used to measure the air pressure in the gas transmission pipeline in the system.
[0011] The present invention also provides an ammonia cracking reaction testing method, the method comprising: heating the ammonia cracking reactor to be tested; When the ammonia cracking reactor to be tested is at a target temperature, ammonia gas is transferred to the ammonia cracking reactor to undergo an ammonia cracking reaction and obtain a mixed gas after the reaction; The components of the mixed gas are analyzed, and the ammonia cracking conversion rate is determined based on the analysis results.
[0012] Optionally, heating the ammonia cracking reactor to be tested includes: heating the ammonia cracking reactor to be tested according to a first temperature change rate, and collecting the real-time temperature of the ammonia cracking reactor to be tested; When the real-time temperature is greater than the first target temperature, the real-time temperature is adjusted according to a second temperature change rate until the real-time temperature is within a second target temperature range.
[0013] Optionally, when the ammonia cracking reactor to be tested is at a target temperature, transmitting ammonia gas to the ammonia cracking reactor to be tested to cause an ammonia cracking reaction and obtain a mixed gas after the reaction, comprises: When it is detected that the current temperature of the ammonia cracking reactor to be tested is lower than the target temperature, an inert gas is transmitted to the ammonia cracking reactor to be tested so that the inert gas in the ammonia cracking reactor to be tested reaches a target concentration, or, When it is detected that the current temperature of the ammonia cracking reactor to be tested is greater than or equal to the target temperature, ammonia gas is transmitted to the ammonia cracking reactor to be tested to generate an ammonia cracking reaction and obtain a mixed gas after the reaction.
[0014] The present invention has at least the following beneficial effects: The ammonia cracking reaction test system uses a temperature control module to precisely control the reaction temperature, ensuring stable and repeatable reaction conditions and guaranteeing the reliability of experimental data. The ammonia cracking reaction module cracks ammonia gas at a set temperature to generate a gas mixture, providing an experimental platform for studying reaction components and catalyst performance. The analysis module accurately analyzes the gas mixture's composition and calculates the ammonia cracking conversion rate, providing detailed test data and filling a gap in experimental data. Furthermore, when the ammonia supply is interrupted, the inert gas output is stopped to prevent interference. When the ammonia supply is stopped, the inert gas output is restored to protect the reaction system from oxidation and impurities, ensuring the purity of the test environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.
[0016] Figure 1 This is a flow chart of the steps of an ammonia cracking reaction test method; Figure 2 Another process step diagram of an ammonia cracking reaction test method; Figure 3 It is a structural diagram of an ammonia cracking reaction test system; Figure 4 This is another structural schematic diagram of an ammonia cracking reaction test system; Among them, 200, temperature control module; 210, ammonia supply module; 220, inert gas supply module; 230, ammonia cracking reaction module; 240, analysis module; 211, ammonia source unit; 212, switch valve; 213, first filter unit; 214, first flow control unit; 221, inert gas source unit; 222, air pressure sensor module; 223, second flow control unit. DETAILED DESCRIPTION
[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0018] The researchers of this application found that in traditional ammonia cracking devices, the catalyst is carried in a cylindrical cracking furnace with a honeycomb or mesh interior, and the reaction gas passes through the furnace and undergoes a cracking reaction. Traditional ammonia cracking devices have disadvantages such as being very bulky, uneven internal heating, increased reverse reaction, and high energy consumption. Due to the characteristics of small spatial characteristic dimensions and large surface area / volume ratio, the interfacial reaction rate of microreactors far exceeds that of stirred tanks; in addition, microreactors have excellent heat and mass transfer capabilities, which can achieve instantaneous uniform mixing of materials and efficient heat transfer. The use of microreactors in the field of hydrogen production can promote the rapid arrival of electrochemical reactants at the reaction interface, thereby increasing the electrochemical interfacial reaction rate. At present, the ammonia cracking microreactor device is in the design stage, and a large amount of experimental and theoretical data is urgently needed to optimize and verify key parameters such as the microreactor flow field structure, catalyst carrier structure, and temperature control structure.
[0019] In addition, as a kind of electrocatalytic reaction, ammonia cracking must focus on the improvement of catalysts for its product iteration and update. At present, a large number of scholars are studying ammonia cracking catalysts. On the one hand, they are committed to reducing the cost of catalysts, such as the development of non-precious metal catalysts and the optimization of low-loaded precious metal catalysts; on the other hand, they are committed to reducing energy consumption, that is, by developing high-activity catalysts to reduce the heat absorbed during ammonia cracking, thereby reducing energy consumption and achieving low-cost hydrogen production. However, due to the lack of a testing platform, most cracking catalyst development can only verify a small amount of powdered catalysts in small equipment such as tubular furnaces, which is far from representing large-scale and industrialized levels. Whether it is the design of ammonia cracking microreactors or the industrial verification of ammonia cracking catalysts, a matching testing platform is urgently needed to obtain stable and reliable data. In order to solve the technical problem of the lack of detailed testing and analysis of ammonia cracking reaction devices or catalyst performance in the prior art, the present application provides the following embodiments: Please refer to Figure 1 , Figure 1 It is a process step diagram of an ammonia cracking reaction test method.
[0020] This embodiment also provides an ammonia cracking reaction testing method comprising: S101, heating the ammonia cracking reactor to be tested.
[0021] S102. When the ammonia cracking reactor to be tested is at a target temperature, ammonia gas is transferred to the ammonia cracking reactor to be tested to cause an ammonia cracking reaction and obtain a mixed gas after the reaction.
[0022] S103. Analyze the components of the mixed gas and determine the ammonia cracking conversion rate based on the analysis results.
[0023] As can be understood, first, in step S101, the ammonia cracking reactor is heated to ensure that it reaches the target temperature. This process provides the necessary thermodynamic conditions for the ammonia cracking reaction, ensuring reaction stability and repeatability. Next, in step S102, once the reactor reaches the target temperature, ammonia gas is transferred to the reactor for a cracking reaction, generating a mixed gas. This process simulates actual operating conditions and provides an experimental basis for studying the performance of ammonia cracking reaction devices and catalysts. Finally, in step S103, the composition of the mixed gas is analyzed and the ammonia cracking conversion rate is calculated, directly reflecting the catalyst activity and reaction efficiency, providing key data support for optimizing reaction conditions and catalyst performance.
[0024] In some embodiments, step S101 includes: The ammonia cracking reactor to be tested is heated according to a first temperature change rate, and the real-time temperature of the ammonia cracking reactor to be tested is collected; when the real-time temperature is greater than the first target temperature, the real-time temperature is adjusted according to a second temperature change rate until the real-time temperature is within a second target temperature range.
[0025] It is understandable that the temperature control means added to the above technical solution further improves the accuracy and stability of the ammonia cracking reaction test. By setting the first temperature change rate to heat the reactor and collecting temperature data in real time, the heating process can be accurately controlled to avoid thermal stress damage to the reactor caused by temperature fluctuations. When the real-time temperature exceeds the first target temperature, it switches to the second temperature change rate for fine-tuning until the temperature stabilizes within the second target temperature range, ensuring the stable operation of the reactor at the target temperature. This staged temperature control method not only improves the flexibility and accuracy of temperature regulation, but also provides more stable thermodynamic conditions for the ammonia cracking reaction, thereby obtaining more reliable and accurate experimental data, and further optimizing the test results of the ammonia cracking reaction device and catalyst performance.
[0026] In some embodiments, step S102 includes: When it is detected that the current temperature of the ammonia cracking reactor to be tested is lower than the target temperature, an inert gas is transmitted to the ammonia cracking reactor to be tested so that the inert gas in the ammonia cracking reactor to be tested reaches the target concentration, or, when it is detected that the current temperature of the ammonia cracking reactor to be tested is greater than or equal to the target temperature, ammonia is transmitted to the ammonia cracking reactor to be tested to cause an ammonia cracking reaction and obtain a mixed gas after the reaction.
[0027] It's understandable that this added measure to the technical solution further optimizes the ammonia cracking reaction testing process. By delivering inert gas when the reactor temperature is below the target, the stability and safety of the gas environment within the reactor are ensured, while also preventing non-ideal contact between ammonia and the catalyst at low temperatures, thus protecting catalyst performance. Once the temperature reaches the target, ammonia is delivered for the cracking reaction, ensuring optimal reaction conditions. This linked control of temperature and gas delivery not only improves the stability and reliability of the reaction but also more accurately simulates actual operating conditions, ensuring the acquisition of stable and reliable experimental data and further enhancing the performance and practicality of the ammonia cracking reaction testing system.
[0028] Please refer to Figure 2 , Figure 2 Another process step diagram of an ammonia cracking reaction test method.
[0029] This application also provides a specific embodiment of implementing the above-mentioned ammonia cracking reaction testing method in an actual scenario.
[0030] like Figure 2As shown in FIG, the flow chart describes the operation process of an ammonia cracking reaction test system, and the specific steps are as follows: (1) Connect the ammonia cracking reactor to be tested to the test system.
[0031] (2) Start the entire test system.
[0032] (3) Inert gas is introduced into the system to remove impurities or residual gas in the system. In this embodiment, the inert gas is argon.
[0033] (4) Activate the temperature control module and start adjusting the temperature of the reactor.
[0034] (5) If the current temperature is lower than 200°C, switch the ammonia gas to argon gas and continue heating. If the current temperature reaches or exceeds 200°C, switch the argon gas to ammonia gas.
[0035] (6) If the temperature is not within the range of 200-800°C, switch the ammonia gas to argon gas again and adjust the temperature accordingly. If the temperature is within this range, proceed to the next step.
[0036] (7) If the cracking reaction does not proceed, a shutdown request is sent. If the cracking reaction proceeds, the concentration sensor is turned on to analyze the cracking conversion rate, and the temperature is adjusted to the required test temperature for testing.
[0037] (8) After the reaction is completed, perform shutdown operation.
[0038] (9) In multiple steps, it is determined whether a shutdown request has been received. If so, the corresponding shutdown operation is performed, including automatic purging for 1 hour and then shutting down the system. During the shutdown process, the system automatically introduces argon gas for purging, which lasts for 1 hour and then shuts down the entire system.
[0039] An embodiment of the present application further provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, any of the above ammonia cracking reaction test methods is implemented.
[0040] It can be understood that the contents of the above method embodiments are all applicable to the electronic device embodiment. The functions specifically implemented by the electronic device embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.
[0041] An embodiment of the present application further provides a computer-readable storage medium storing a program executable by a processor. When the program executable by the processor is executed by the processor, it is used to implement the ammonia cracking reaction test method as described in any one of the above specific embodiments.
[0042] An embodiment of the present application also discloses a computer program product, including a computer program or computer instructions, wherein the computer program or computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device performs the ammonia cracking reaction test method described in any of the previous embodiments.
[0043] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiment, the functions specifically implemented by the present storage medium embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.
[0044] Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of an ammonia cracking reaction test system is shown in FIG.
[0045] This embodiment provides an ammonia cracking reaction testing system including a temperature control module, an ammonia supply module, an ammonia cracking reaction module, and an analysis module.
[0046] The temperature control module is used to control the target temperature of the ammonia cracking reaction.
[0047] The ammonia cracking reaction module is used to crack the ammonia output from the ammonia supply module in an environment of target temperature and obtain a mixed gas after the reaction.
[0048] The analysis module is used to analyze the composition of the mixed gas and obtain ammonia cracking reaction test data.
[0049] As can be understood, this technical solution, by constructing a complete ammonia cracking reaction test system, systematically addresses the existing problem of a lack of detailed testing and analysis of ammonia cracking reaction devices or catalyst performance. First, the temperature control module precisely regulates the reaction temperature, ensuring the stability of reaction conditions and providing a basis for the reliability of experimental data. Second, the ammonia cracking reaction module cracks ammonia at the target temperature, simulating actual operating conditions and providing an experimental platform for studying microreactors and catalyst performance. The analysis module precisely analyzes the composition of the post-cracking mixed gas, enabling real-time acquisition of key ammonia cracking reaction data, such as hydrogen production efficiency and ammonia conversion rate. By integrating these modules, the system not only provides detailed testing and analysis but also accumulates a wealth of experimental data, providing strong support for optimizing ammonia cracking microreactors, verifying catalyst performance, and promoting industrial applications, thus filling a gap in the existing technology.
[0050] In some embodiments, the temperature control module includes: The temperature detection unit is used to collect the real-time temperature of the ammonia cracking reaction module.
[0051] The temperature control unit is used to compare the real-time temperature with the target temperature and heat the ammonia cracking reaction module according to the comparison result.
[0052] In some embodiments, the temperature control unit includes a first temperature control subunit and a second temperature control subunit.
[0053] Temperature control units are also used for: The first temperature control subunit controls the first temperature change rate and heats the ammonia cracking reaction module to the first target temperature; the second temperature control subunit controls the second temperature change rate and heats the ammonia cracking reaction module to the second target temperature.
[0054] In some embodiments, the temperature detection unit is a temperature probe inserted into the interior of the ammonia cracking reaction module, or an infrared thermal imaging sensor located outside the ammonia cracking reaction module.
[0055] It is understandable that by adding a detailed temperature control module, this technical solution significantly improves the accuracy and reliability of ammonia cracking reaction testing. The temperature detection unit can monitor the temperature of the reaction module in real time, ensuring precise control. The first and second temperature control subunits are responsible for different temperature change rates, making temperature regulation more flexible and precise, helping to optimize reaction conditions. The use of temperature probes or infrared thermal imaging sensors provides a variety of temperature detection methods, enhancing the adaptability and accuracy of the system. These improvements ensure that the reaction proceeds at the optimal temperature, improve the efficiency and safety of the ammonia cracking reaction, and provide solid data support for catalyst performance evaluation and reactor optimization.
[0056] In some embodiments, the ammonia supply module includes an ammonia source unit and a first flow control unit; the output end of the ammonia source unit is connected to the input end of the first flow control unit through a gas transmission pipeline, and the output end of the first flow control unit is connected to the input end of the ammonia cracking reaction module as the output end of the ammonia supply module.
[0057] The first flow control unit is used to adjust the flow of ammonia output to the ammonia cracking reaction module.
[0058] The analysis module is used to determine the ammonia cracking conversion rate before and after ammonia flow regulation.
[0059] In some embodiments, the ammonia supply module further includes a first filter unit; the output end of the ammonia source unit is connected to the input end of the first filter unit, and the output end of the first filter unit is connected to the output end of the first flow control unit.
[0060] As can be appreciated, the addition of an ammonia supply module and analysis module improves the accuracy and controllability of the ammonia cracking reaction test system. The first flow control unit precisely regulates the ammonia flow rate, ensuring consistent and repeatable reaction conditions. The introduction of the first filtration unit ensures ammonia purity and prevents impurities from affecting reaction results. The analysis module measures the ammonia cracking conversion rate before and after flow adjustment, providing critical performance data to optimize reaction conditions and improve catalyst efficiency. These improvements ensure the accuracy of test data and provide a more reliable basis for evaluating the performance of the ammonia cracking reactor and catalyst.
[0061] In some embodiments, an ammonia cracking reaction test system further includes an inert gas supply module for outputting an inert gas to the ammonia cracking reaction module.
[0062] The inert gas supply module is used to close the valve that outputs the inert gas to the ammonia cracking reaction module when the ammonia supply module outputs ammonia; and to open the valve that outputs the inert gas to the ammonia cracking reaction module when the ammonia supply module stops outputting ammonia.
[0063] In some embodiments, the inert gas supply module includes an inert gas source unit and a second flow control unit; the output end of the inert gas source unit is connected to the input end of the second flow control unit through a gas transmission pipeline, and the output end of the second flow control unit is connected to the input end of the ammonia cracking reaction module as the output end of the inert gas supply module.
[0064] The second flow control unit is used to adjust the flow of the inert gas output to the ammonia cracking reaction module.
[0065] As can be appreciated, the addition of an inert gas supply module enables more precise control of the reaction environment in the ammonia cracking reaction test system. During ammonia supply, the inert gas output is shut off, ensuring sufficient contact between ammonia and the catalyst, improving reaction efficiency. When the ammonia supply stops, the inert gas supply is promptly switched to protect the catalyst from oxidation and other adverse conditions, extending its service life. This design improves test flexibility and accuracy, ensures stable reaction conditions, and enhances system safety, providing a more reliable testing platform for the ammonia cracking reaction and optimizing the quality of experimental data and catalyst performance evaluation.
[0066] In some embodiments, the ammonia cracking reaction module includes an ammonia cracking reaction unit and a gas switching unit.
[0067] The gas switching unit includes a switching valve and a gas transmission pipeline; when the switching valve is in a first switching state, one end of the gas transmission pipeline is used to input ammonia, and the other end of the gas transmission pipeline is connected to the input end of the ammonia cracking reaction unit, and ammonia is transmitted to the ammonia cracking reaction unit through the input end of the ammonia cracking reaction unit; when the switching valve is in a second switching state, one end of the gas transmission pipeline is used to input inert gas, and the other end of the gas transmission pipeline is connected to the input end of the ammonia cracking reaction unit, and the inert gas is transmitted to the ammonia cracking reaction unit through the input end of the ammonia cracking reaction unit.
[0068] As you can see, the gas switching unit allows for rapid switching between ammonia and inert gas, ensuring the appropriate gas environment during different testing phases. By switching valve control, the system can be precisely purged with inert gas before the reaction to protect the catalyst, and then purged with inert gas after the reaction to prevent side reactions. This design not only improves the controllability of the reaction but also helps extend the life of the catalyst, ensuring the accuracy and repeatability of test results, and providing a more reliable experimental platform for performance evaluation and optimization of ammonia cracking reactions.
[0069] In some embodiments, an ammonia cracking reaction testing system further includes a pressure sensing module, which includes a plurality of air pressure sensors distributed throughout the system; each air pressure sensor is used to measure the air pressure in a gas transmission pipeline in the system.
[0070] As you can see, incorporating a pressure sensing module into the ammonia cracking reaction test system further enhances the system's monitoring capabilities by enabling real-time monitoring of the gas pressure within the gas transmission pipeline via multiple pressure sensors. This allows the operator to precisely control and adjust the gas flow rate, ensuring stable reaction conditions. Pressure monitoring also helps prevent system overpressure or underpressure, enhancing safety. Furthermore, accurate pressure data is crucial for analyzing reaction kinetics and optimizing reactor design, providing key parameters for performance evaluation and process optimization of the ammonia cracking reaction, thereby improving the reliability of the entire test system and the accuracy of the experimental data.
[0071] Please refer to Figure 4 , Figure 4 This is another structural schematic diagram of an ammonia cracking reaction test system.
[0072] like Figure 4 As shown, an ammonia cracking reaction test system includes a temperature control module 200 , a temperature control module 210 , an ammonia cracking reaction module 230 , an inert gas supply module 220 and an analysis module 240 .
[0073] The temperature control module mainly includes a temperature control unit and a temperature detection unit.
[0074] The temperature control unit includes a first temperature control subunit and a second temperature control subunit.
[0075] The first temperature control subunit has a temperature control range of room temperature to 200°C, mainly for preheating the ammonia cracking microreactor. The second temperature control subunit has a temperature control range of 200-800°C, mainly for providing the ammonia cracking microreactor with the required reaction temperature.
[0076] The heating rate of the first temperature control subunit should not be too fast. Considering the humid environment and the low initial temperature of the ammonia cracking microreactor, too fast a heating rate will prevent the internal thermal stress from being effectively released, thus causing the risk of thermal deformation. The general heating rate is 3-5°C / min.
[0077] The heating rate of the second temperature control subunit can be appropriately accelerated to fully preheat the microreactor. However, overly rapid heating can prevent the effective release of internal thermal stresses, leading to the risk of thermal deformation. The temperature control generally does not exceed 30°C / min.
[0078] The ammonia supply module includes an ammonia source unit 211, a switch valve 213, a first filter unit 213, a first flow control unit 214, and an air pressure sensor module 222; the ammonia source unit 211 is a liquid ammonia tank, the purpose of which is to leave enough time for liquid ammonia to be converted into gaseous ammonia.
[0079] The inert gas supply module 220 includes an inert gas source unit 221, an air pressure sensor module 222, a second flow control unit 223, a switch valve 212, etc.; the inert gas supply module 220 is mainly used to discharge residual air in the pipeline and the micro-reactor before the reaction to ensure that the interior is completely filled with inert gas; in addition, it discharges excess ammonia in the pipeline and the micro-reactor after the reaction to prevent excessive ammonia accumulation from causing safety problems.
[0080] The ammonia cracking reaction module 230 is an independent module including an ammonia cracking microreactor and an ammonia cracking catalyst verification device. The temperature is adjusted by real-time feedback from the temperature sensor inside the ammonia cracking device. The gas composition introduced is dynamically adjusted by the different temperature ranges of the ammonia cracking device during the test. At the same time, the temperature increase or decrease is controlled by whether the reaction is in progress.
[0081] The analysis module 240 mainly analyzes the reaction gas composition to obtain the ammonia cracking conversion rate η, which is used to verify the ammonia cracking performance and stability under different temperatures, different flow rates, different ammonia cracking device structural parameters and different catalysts.
[0082] The analysis module 240 may be one or a combination of hydrogen gas analysis, nitrogen gas analysis, or ammonia gas analysis.
[0083] The ammonia cracking reaction is as follows:
[0084] For example, consider real-time monitoring of the gas components in exhaust gas, where hydrogen content is expressed as q%, nitrogen content is expressed as b%, and ammonia content is expressed as c%. As the reaction proceeds, 2 mol of ammonia produces 1 mol of nitrogen and 3 mol of hydrogen. Assume that the amount of pure ammonia at this point is a, and the reaction consumes x, while simultaneously producing 1.5x hydrogen and 0.5x nitrogen. When the ammonia is completely reacted, a = x.
[0085] The conversion rate η is calculated as follows: When the tail gas monitoring shows the remaining ammonia content c%, then η= *100; When the tail gas monitoring shows the residual nitrogen content b%, η= *100; When the tail gas monitoring shows the residual hydrogen content q%, then η= *100; Ammonia gas is output from the ammonia source unit 211 and passes through the first filtration unit 213 to remove impurities and moisture, ensuring the purity of the ammonia entering the reaction module. The filtered ammonia gas enters the first flow control unit 214, which regulates the flow rate to a set value. The regulated ammonia gas enters the gas switching unit through a gas transmission pipeline. When the switching valve is in the first switching state, the ammonia gas enters the ammonia cracking reaction unit through the gas transmission pipeline, where the cracking reaction occurs at the set temperature.
[0086] Inert gas is output from the inert gas supply module 220. The inert gas enters the gas switching unit through the gas transmission pipeline. When the switching valve is in the second switch state, the inert gas enters the ammonia cracking reaction unit through the gas transmission pipeline for purging or protecting the reaction environment.
[0087] The terms "first", "second", "third", "fourth" etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, device, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. It should be understood that in the present application, "at least one (item)" refers to one or more, and "a plurality of" refers to two or more.
[0088] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.
[0089] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.
[0090] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.
[0091] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.
[0092] Although the description of the present application has been quite detailed and specifically describes several embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be considered to provide a broad possible interpretation of these claims by reference to the appended claims, taking into account the prior art, so as to effectively cover the intended scope of the present application. In addition, the above description of the present application is based on the embodiments foreseen by the inventors, which is intended to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.
Claims
1. An ammonia cracking reaction test system, characterized in that: The system includes a temperature control module, an ammonia supply module, an ammonia cracking reaction module, an inert gas supply module and an analysis module; The temperature control module is used to control the target temperature of the ammonia cracking reaction; The ammonia cracking reaction module is used to crack the ammonia output by the ammonia supply module in an environment of the target temperature to obtain a mixed gas after the reaction; The analysis module is used to analyze the components of the mixed gas and determine the ammonia cracking conversion rate based on the analysis results; The inert gas supply module is configured to stop supplying the inert gas to the ammonia cracking reaction module when the ammonia supply module outputs ammonia; and to supply the inert gas to the ammonia cracking reaction module when the ammonia supply module stops outputting ammonia.
2. The ammonia cracking reaction test system according to claim 1, characterized in that: The temperature control module includes: A temperature detection unit, used to collect the real-time temperature of the ammonia cracking reaction module; A temperature control unit is used to compare the real-time temperature with the target temperature and heat the ammonia cracking reaction module according to the comparison result.
3. The ammonia cracking reaction test system according to claim 2, characterized in that: The temperature control unit includes a first temperature control subunit and a second temperature control subunit; The temperature control unit is also used for: controlling a first temperature change rate by the first temperature control subunit and heating the ammonia cracking reaction module to a first target temperature; The second temperature change rate is controlled by the second temperature control subunit and the ammonia cracking reaction module is heated to a second target temperature.
4. The ammonia cracking reaction test system according to claim 1, characterized in that: The ammonia supply module includes an ammonia source unit and a first flow control unit; The output end of the ammonia source unit is connected to the input end of the first flow control unit through a gas transmission pipeline, and the output end of the first flow control unit serves as the output end of the ammonia supply module and is connected to the input end of the ammonia cracking reaction module; The first flow control unit is used to adjust the flow of ammonia output to the ammonia cracking reaction module; The analysis module is used to determine the ammonia cracking conversion rate before and after the ammonia flow rate is adjusted.
5. The ammonia cracking reaction test system according to claim 4, characterized in that: The ammonia supply module further includes a first filtering unit; The output end of the ammonia source unit is connected to the input end of the first filter unit, and the output end of the first filter unit is connected to the output end of the first flow control unit.
6. The ammonia cracking reaction test system according to claim 1, characterized in that: The ammonia cracking reaction module includes an ammonia cracking reaction unit and a gas switching unit; The gas switching unit includes a switching valve and a gas transmission pipeline; When the switching valve is in the first switch state, one end of the gas transmission pipeline is used to input ammonia gas, and the other end of the gas transmission pipeline is connected to the input end of the ammonia cracking reaction unit, and ammonia gas is transmitted to the ammonia cracking reaction unit through the input end of the ammonia cracking reaction unit; When the switching valve is in the second switching state, one end of the gas transmission pipeline is used to input inert gas, and the other end of the gas transmission pipeline is connected to the input end of the ammonia cracking reaction unit, and the inert gas is transmitted to the ammonia cracking reaction unit through the input end of the ammonia cracking reaction unit.
7. The ammonia cracking reaction test system according to claim 1, characterized in that: The system further includes a pressure sensing module, wherein the pressure sensing module includes a plurality of air pressure sensors distributed throughout the system; Each of the air pressure sensors is used to measure the air pressure in the gas transmission pipeline in the system.
8. A method for testing an ammonia cracking reaction, characterized in that: The method comprises: heating the ammonia cracking reactor to be tested; When the ammonia cracking reactor to be tested is at a target temperature, ammonia gas is transferred to the ammonia cracking reactor to undergo an ammonia cracking reaction and obtain a mixed gas after the reaction; The components of the mixed gas are analyzed, and the ammonia cracking conversion rate is determined based on the analysis results.
9. The ammonia cracking reaction testing method according to claim 8, characterized in that: The heating of the ammonia cracking reactor to be tested comprises: heating the ammonia cracking reactor to be tested according to a first temperature change rate, and collecting the real-time temperature of the ammonia cracking reactor to be tested; When the real-time temperature is greater than the first target temperature, the real-time temperature is adjusted according to a second temperature change rate until the real-time temperature is within a second target temperature range.
10. The ammonia cracking reaction testing method according to claim 8, characterized in that: When the ammonia cracking reactor to be tested is at a target temperature, ammonia gas is transferred to the ammonia cracking reactor to undergo an ammonia cracking reaction, and a mixed gas after the reaction is obtained, comprising: When it is detected that the current temperature of the ammonia cracking reactor to be tested is lower than the target temperature, an inert gas is transmitted to the ammonia cracking reactor to be tested so that the inert gas in the ammonia cracking reactor to be tested reaches a target concentration, or, When it is detected that the current temperature of the ammonia cracking reactor to be tested is greater than or equal to the target temperature, ammonia gas is transmitted to the ammonia cracking reactor to be tested to generate an ammonia cracking reaction and obtain a mixed gas after the reaction.