Gas supply device for simulating lean and rich oxygen atmosphere of automobile exhaust
By using a gas supply device that simulates the oxygen-deficient and oxygen-rich atmosphere of automobile exhaust, the problems of high cost and long cycle in catalyst performance testing have been solved, enabling efficient and low-cost catalyst screening and optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGCHUN INSTITUTE OF APPLIED CHEMISTRY CHINESE ACADEMY OF SCIENCES
- Filing Date
- 2025-04-28
- Publication Date
- 2026-04-21
AI Technical Summary
Traditional catalyst performance testing is costly and time-consuming in engine bench experiments, especially in the initial catalyst screening stage.
A gas supply device for simulating the oxygen-deficient and oxygen-rich atmosphere of automobile exhaust is provided, including a gas cylinder, a flow controller, a three-way valve and a mass spectrometer. By precisely controlling the gas flow rate and concentration, the reaction conditions of the catalyst under different oxygen atmospheres are simulated, thereby reducing dependence on the engine.
It significantly reduces the cost of catalyst performance testing, shortens the testing cycle, and improves the accuracy and safety of experiments, providing strong support for catalyst research and development.
Smart Images
Figure CN224152034U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of automotive exhaust simulation technology, and in particular to an air supply device for simulating an oxygen-deficient atmosphere in automotive exhaust. Background Technology
[0002] Automobile exhaust, containing unburned hydrocarbons, nitrogen oxides, and carbon monoxide, has become a major source of air pollution, posing a serious threat to the environment and human health. To effectively address this pressing issue, the scientific and industrial communities have widely adopted three-way catalysts for the purification of automobile exhaust. These catalysts can simultaneously catalyze the conversion of the aforementioned harmful gases, significantly reducing emissions, and are an important component of current environmental protection technologies. The performance of the catalyst directly affects the efficiency of exhaust purification; therefore, accurate evaluation of its performance is crucial.
[0003] Traditional catalyst performance evaluation primarily relies on engine bench testing, which allows for testing catalyst performance under real-world operating conditions. Engine bench testing requires a complete engine system, including the engine, intake system, exhaust system, fuel supply system, and cooling system. This equipment is typically expensive, especially for high-performance engines. Each test requires complex setup and calibration of the engine bench, including catalyst installation and engine parameter adjustments. These preparations usually consume significant time and manpower, thus significantly extending the overall testing cycle. The high cost and lengthy testing cycle, particularly for the initial catalyst screening stage, pose challenges and limitations.
[0004] Therefore, how to reduce the cost of catalyst performance testing and shorten the testing cycle is a problem that many people in the field need to solve. Utility Model Content
[0005] The purpose of this application is to provide a gas supply device for simulating the oxygen-deficient atmosphere of automobile exhaust, in order to solve the problems of high cost and lengthy testing cycle in the initial screening of catalysts by engine bench tests.
[0006] To solve the above-mentioned technical problems, this application provides a gas supply device for simulating the oxygen-deficient and oxygen-rich atmosphere of automobile exhaust, including: a first gas cylinder, a second gas cylinder, a first flow controller, a second flow controller, a first three-way valve, a second three-way valve, and a mass spectrometer.
[0007] The first gas cylinder is used to store oxygen-deficient gas, and the second gas cylinder is used to store oxygen-enriched gas. The first gas cylinder is connected to the first three-way valve, and the first flow controller is installed on the pipeline connecting the first three-way valve and the first gas cylinder. The second gas cylinder is connected to the second three-way valve, and the second flow controller is installed on the pipeline connecting the second three-way valve and the second gas cylinder. The mass spectrometer is connected to both the first and second three-way valves. The first and second three-way valves are used to connect to a three-way catalyst reactor.
[0008] In one feasible embodiment, the system further includes a manifold and a gas mixing tank. The first end of the manifold is connected to the first three-way valve and the second three-way valve, respectively, and the second end of the manifold is connected to the gas mixing tank, which is used to connect to the three-way catalyst reactor.
[0009] In one feasible embodiment, a first check valve is provided on the pipeline connecting the first three-way valve to the gas mixing tank, and a second check valve is provided on the pipeline connecting the second three-way valve to the gas mixing tank.
[0010] In one feasible embodiment, a temperature control component is also included, which is installed outside the gas mixing tank and is used to regulate the temperature inside the gas mixing tank.
[0011] In one feasible embodiment, a steam generator is further included, which is connected to the gas mixing tank, and a valve is provided on the pipeline connecting the steam generator and the gas mixing tank.
[0012] In one feasible embodiment, the device further includes a hydrogen leak detector and an alarm device, wherein the hydrogen leak detector is connected to the alarm device, and the alarm device generates an alarm signal when the hydrogen content detected by the hydrogen leak detector exceeds a preset value.
[0013] In one feasible embodiment, a first pressure reducing valve is provided on the pipeline connecting the first gas cylinder to the first flow controller, and a second pressure reducing valve is provided on the pipeline connecting the second gas cylinder to the second flow controller.
[0014] In one feasible embodiment, the gas mixing tank includes a tank body and a stirring device and a pressure sensor installed in the tank body, wherein the inner wall of the tank body is provided with cross-arranged baffles.
[0015] In one feasible embodiment, the temperature control assembly includes a heating element, an insulation layer, and a temperature sensor. The heating element is wrapped around the outer wall of the gas mixing tank, the insulation layer is wrapped around the outside of the heating element, and the temperature sensor is installed inside the gas mixing tank to monitor the temperature inside the gas mixing tank.
[0016] In one feasible embodiment, the pipeline connecting the gas mixing tank and the triple-effect catalyst reactor is wrapped with an insulation layer.
[0017] This application provides a gas supply device for simulating the oxygen-deficient and oxygen-enriched atmosphere of automobile exhaust, comprising: a first gas cylinder, a second gas cylinder, a first flow controller, a second flow controller, a first three-way valve, a second three-way valve, and a mass spectrometer. The first gas cylinder stores oxygen-deficient gas, and the second gas cylinder stores oxygen-enriched gas. The first gas cylinder is connected to the first three-way valve. The first flow controller is installed on the pipeline connecting the first three-way valve and the first gas cylinder. The second gas cylinder is connected to the second three-way valve. The second flow controller is installed on the pipeline connecting the second three-way valve and the second gas cylinder. The mass spectrometer is connected to both the first and second three-way valves. The first and second three-way valves are used to connect to a three-way catalytic converter. By using two flow controllers, two three-way valves, and a mass spectrometer for gas concentration detection, the simulation and modulation of the key atmosphere in the automobile exhaust purification process are achieved without the need for engine simulation. This not only reduces the cost of catalyst performance testing but also significantly shortens the testing cycle, providing strong support for the research and optimization of three-way catalytic converters. Attached Figure Description
[0018] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A structural diagram of an air supply device for simulating an oxygen-deficient atmosphere in automobile exhaust, provided in an embodiment of this application;
[0020] Figure 2 A structural diagram of another gas supply device for simulating an oxygen-deficient atmosphere in automobile exhaust, provided in an embodiment of this application;
[0021] Figure 3 This is a graph showing the change in oxygen concentration when the gas path is monitored at different switching frequencies using a mass spectrometer, as provided in an embodiment of this application.
[0022] The attached diagram is labeled as follows: 1-First gas cylinder, 2-Second gas cylinder, 3-First flow controller, 4-Second flow controller, 5-First three-way valve, 6-Second three-way valve, 7-Mass spectrometer, 8-Three-way catalyst reactor, 9-Combination pipeline, 10-Gas mixing tank, 11-First check valve, 12-Second check valve, 13-Temperature control component, 14-Hydrogen leak detector, 15-First pressure reducing valve, 16-Second pressure reducing valve. Detailed Implementation
[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.
[0024] The core of this application is to provide a gas supply device for simulating the oxygen-deficient atmosphere of automobile exhaust, thereby reducing the cost of catalyst performance testing and shortening the testing cycle.
[0025] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] Figure 1 This is a structural diagram of an air supply device for simulating an oxygen-deficient atmosphere in automobile exhaust, provided in an embodiment of this application. Figure 2 A structural diagram of another gas supply device for simulating an oxygen-deficient atmosphere in automobile exhaust provided in this application embodiment is shown below. Figure 1 and Figure 2 As shown, the gas supply device for simulating the oxygen-deficient and oxygen-enriched atmosphere of automobile exhaust includes: a first gas cylinder 1, a second gas cylinder 2, a first flow controller 3, a second flow controller 4, a first three-way valve 5, a second three-way valve 6, and a mass spectrometer 7; the first gas cylinder 1 is used to store oxygen-deficient gas, the second gas cylinder 2 is used to store oxygen-enriched gas, the first gas cylinder 1 is connected to the first three-way valve 5, the first flow controller 3 is installed on the pipeline connecting the first three-way valve 5 and the first gas cylinder 1, the second gas cylinder 2 is connected to the second three-way valve 6, the second flow controller 4 is installed on the pipeline connecting the second three-way valve 6 and the second gas cylinder 2, and the mass spectrometer 7 is connected to the first three-way valve 5 and the second three-way valve 6 respectively. The first three-way valve 5 and the second three-way valve 6 are used to connect to a three-way catalyst reactor 8.
[0027] In this application, the first gas cylinder 1 is used to store oxygen-deficient gas. Specifically, the oxygen-deficient gas may contain 16.3% CO2 (carbon dioxide), 0.3% CO (carbon monoxide), 0.1% H2 (hydrogen), 0.6% O2 (oxygen), 0.16% NO (nitric oxide), 280 ppm C3H8 (propane), 280 ppm C3H6 (propylene), and Ar (argon) as a balancing gas. The air-fuel ratio of the first gas cylinder 1 is less than 1, mainly simulating the fuel-rich atmosphere produced when the engine combustion is incomplete. The second gas cylinder 2 is used to store oxygen-enriched gas. Specifically, the oxygen-enriched gas may contain 16.3% CO2 (carbon dioxide), 1.2% CO (carbon monoxide), 0.4% H2 (hydrogen), 1.1% O2 (oxygen), 0.16% NO (nitric oxide), 280 ppm C3H8 (propane), 280 ppm C3H6 (propylene), and Ar (argon) as a balancing gas. The air-fuel ratio of the gas in the second gas cylinder 2 is greater than 1, mainly simulating the oxygen-enriched atmosphere when there is excess air.
[0028] The first flow controller 3 is used to measure and control the flow rate of lean gas, and the second flow controller 4 is used to measure and control the flow rate of enriched gas. By controlling the flow rates of the two gases, the first flow controller 3 and the second flow controller 4 can adjust the air-fuel ratio of the mixture, ensuring the accuracy and repeatability of the experimental conditions. Ideally, when lean and enriched gases are mixed at the same flow rate, the air-fuel ratio should be exactly 1, primarily simulating the engine's operating state under theoretically complete combustion conditions. The flow controllers (first flow controller 3 and second flow controller 4) typically consist of the following parts: a flow sensor, a controller, and a regulating valve; the flow sensor measures the actual flow rate of the fluid; the controller calculates the deviation based on the flow sensor's measurement and setpoint and outputs a control signal; the regulating valve adjusts the valve opening according to the controller's signal, thereby changing the gas flow rate.
[0029] The first three-way valve 5 is used to control the flow direction of oxygen-deficient gas, and the second three-way valve 6 is used to control the flow direction of oxygen-enriched gas. The three-way valves can switch the gas flow direction, allowing the gas to enter the mass spectrometer 7 for analysis or the triple-effect catalyst reactor 8 for experiments. This switching function is crucial for periodically alternating between oxygen-deficient and oxygen-enriched atmospheres. In this application, the first three-way valve 5 and the second three-way valve 6 can be electromagnetic three-way valves, so that the control system can control the first three-way valve 5 and the second three-way valve 6 accordingly, for example, periodically switching the gas path. The switching frequency of the two gas paths can be 0.5 Hz, that is, switching periodically once every 1 second, with one path entering the mass spectrometer 7 while the other enters the triple-effect catalyst reactor 8; for example, oxygen-deficient gas entering the mass spectrometer 7 while oxygen-enriched gas enters the triple-effect catalyst reactor 8.
[0030] The mass spectrometer 7 is connected to the first three-way valve 5 and the second three-way valve 6, respectively, via a pipeline connection. The mass spectrometer 7 is used to monitor and analyze the composition and concentration of the gas in real time. Through the detection by the mass spectrometer 7, the flow sensors (first flow controller 3 and second flow controller 4) can be controlled to regulate the air-fuel ratio of the gas, ensuring the accuracy of experimental conditions. The three-way catalytic converter 8 contains a three-way catalytic converter, which can catalytically convert harmful gases in the exhaust gas, simulating the purification process of automobile exhaust.
[0031] The first three-way valve 5 and the second three-way valve 6 are used to switch the gas flow direction. By periodically switching the three-way valves, oxygen-deficient gas and oxygen-enriched gas can be alternately introduced into the three-way catalytic converter 8. The mass spectrometer 7 monitors the composition and concentration of the gas in real time and feeds the data back to the control system. Based on the detection results of the mass spectrometer 7, the control system adjusts the flow rate of the flow controller to ensure that the air-fuel ratio of the mixed gas meets the experimental requirements. For ease of understanding, the operation of simulating the oxygen-deficient and oxygen-enriched atmosphere of automobile exhaust is described below: the oxygen-deficient atmosphere is introduced into the three-way catalytic converter 8 through one path, and the oxygen-enriched atmosphere is introduced into the mass spectrometer 7 through another path. After 30 seconds, the two three-way valves are switched simultaneously, with the oxygen-deficient atmosphere entering the mass spectrometer 7 and the oxygen-enriched atmosphere entering the three-way catalytic converter 8; the switching frequency of the two three-way valves can be adjusted to 0.5Hz. The mass spectrometer 7 determines the oxygen concentration in the oxygen-enriched atmosphere within the first 30-second time range and determines the oxygen concentration in the oxygen-deficient atmosphere within the next 30-second time range. By fine-tuning the two flow controllers, the total air-fuel ratio of the gas in the two paths is made equal to 1. Furthermore, by adjusting the two flow controllers, the gas composition can be varied within a preset air-fuel ratio range (0.95~1.05). Based on this, the gas supply device of this application can periodically and alternately provide oxygen-deficient and oxygen-enriched atmospheres, highly simulating engine bench test conditions. Compared with traditional engine bench tests, this device significantly reduces testing costs, shortens the catalyst performance testing cycle, and accelerates the development process of new catalysts. Real-time monitoring of gas composition and concentration using a mass spectrometer ensures the accuracy and stability of experimental conditions. Precise control of gas flow rate and composition reduces safety risks during the experiment. Figure 3 This application provides an embodiment of a mass spectrometer monitoring oxygen concentration signal change diagram at different switching frequencies in the gas path, as shown in the following example. Figure 3The diagram shows the changes in oxygen concentration with temperature at different switching frequencies. 30-second switching between oxygen-deficient and oxygen-enriched atmospheres (light green area): In this area, the switching time between oxygen-deficient and oxygen-enriched atmospheres is 30 seconds. The oxygen concentration fluctuates significantly, indicating that the change in oxygen concentration is quite drastic within this 30-second switching interval. This switching method allows the oxygen concentration to be adjusted to the target concentration. 1-second switching between oxygen-deficient and oxygen-enriched atmospheres (dark green area): In this area, the switching time between oxygen-deficient and oxygen-enriched atmospheres is 1 second. The oxygen concentration fluctuates very little, indicating that the change in oxygen concentration is relatively stable within this 1-second switching interval. This switching method more closely resembles the actual reaction conditions in a three-way catalytic converter. Adjusting oxygen concentration (yellow area): In this area, the mass spectrometer is connected to the three-way catalytic converter to detect changes in oxygen concentration within the reactor. In this area, the oxygen concentration gradually decreases and tends to stabilize. In summary, by adjusting the switching frequency of oxygen-deficient and oxygen-enriched atmospheres, the change in oxygen concentration can be controlled, thereby simulating different reaction conditions. This is of great significance for studying the performance of catalysts under different oxygen concentrations.
[0032] This application provides a gas supply device for simulating the oxygen-deficient and oxygen-enriched atmosphere of automobile exhaust, comprising: a first gas cylinder 1, a second gas cylinder 2, a first flow controller 3, a second flow controller 4, a first three-way valve 5, a second three-way valve 6, and a mass spectrometer 7. The first gas cylinder 1 stores oxygen-deficient gas, and the second gas cylinder 2 stores oxygen-enriched gas. The first gas cylinder 1 is connected to the first three-way valve 5. The first flow controller 3 is installed on the pipeline connecting the first three-way valve 5 and the first gas cylinder 1. The second gas cylinder 2 is connected to the second three-way valve 6. The second flow controller 4 is installed on the pipeline connecting the second three-way valve 6 and the second gas cylinder 2. The mass spectrometer 7 is connected to both the first three-way valve 5 and the second three-way valve 6. The first three-way valve 5 and the second three-way valve 6 are used to connect to a three-way catalytic converter 8. Through the two flow controllers, two three-way valves, and the mass spectrometer 7 for gas concentration detection, the simulation and modulation of the key atmosphere in the automobile exhaust purification process are achieved without the need for engine simulation. This not only reduces the cost of catalyst performance testing but also significantly shortens the testing cycle, providing strong support for the research and optimization of three-way catalytic converters.
[0033] Based on the above embodiments, this application embodiment also includes a main pipeline 9 and a gas mixing tank 10. The first end of the main pipeline 9 is connected to the first three-way valve 5 and the second three-way valve 6 respectively, and the second end of the main pipeline 9 is connected to the gas mixing tank 10. The gas mixing tank 10 is used to connect to the three-way catalyst reactor 8.
[0034] In this embodiment, the main pipeline 9 is used to collect the gases from the first three-way valve 5 and the second three-way valve 6 together to form a mixed gas. The gas mixing tank 10 is used to mix the gases from the first three-way valve 5 and the second three-way valve 6, ensuring that the two gases are fully mixed before entering the three-way catalyst reactor 8. This embodiment does not specifically limit the configuration of the gas mixing tank 10. The gas mixing tank 10 may include a tank body and a stirring device and a pressure sensor installed inside the tank body. The inner wall of the tank body is provided with cross-arranged baffles. The tank body is typically made of high-temperature resistant and corrosion-resistant materials; the stirring device is used to enhance the gas mixing effect, ensuring that the two gases can be mixed quickly and uniformly; the stirring device can be a micro fan, a vortex generator, or a mechanical stirrer; the pressure sensor is used to monitor the pressure of the gas inside the tank in real time, ensuring that the system operates within a safe pressure range; the baffles are used to guide gas flow, increase the contact area between gases, and further promote mixing. The baffles are arranged in a cross-arranged manner to form multiple gas flow channels, increasing gas turbulence and improving mixing efficiency. Among them, the gas mixing tank 10 has a volume of 5ml, which can not only mix the two gases relatively evenly, but also switch between oxygen-rich atmosphere and oxygen-deficient atmosphere in a short period of time.
[0035] Based on the above embodiments, in this application embodiment, a first check valve 11 is provided on the pipeline connecting the first three-way valve 5 and the gas mixing tank 10, and a second check valve 12 is provided on the pipeline connecting the second three-way valve 6 and the gas mixing tank 10. The first check valve 11 is installed on the pipeline connecting the first three-way valve 5 and the gas mixing tank 10 to ensure that gas can only flow from the first three-way valve 5 to the gas mixing tank 10, preventing reverse flow. The second check valve 12 is installed on the pipeline connecting the second three-way valve 6 and the gas mixing tank 10 to ensure that gas can only flow from the second three-way valve 6 to the gas mixing tank 10, preventing reverse flow. The function of the check valves is to prevent reverse gas flow, ensuring unidirectional gas flow, thereby maintaining the stability and safety of the system.
[0036] Based on the above embodiments, this application embodiment also includes a temperature control component 13, which is installed outside the gas mixing tank 10 and is used to regulate the temperature inside the gas mixing tank 10.
[0037] The main function of the temperature control component 13 is to regulate the temperature inside the gas mixing tank 10. By precisely controlling the temperature inside the gas mixing tank 10, it can be ensured that the gas reaches the required temperature conditions before entering the three-way catalytic converter 8. This is crucial for simulating the actual working conditions in the process of purifying automobile exhaust, as the performance of the catalyst is usually closely related to temperature. Of course, the temperature control component 13 can also be installed outside the three-way catalytic converter 8. This application embodiment does not specifically limit the configuration of the temperature control component 13. The temperature control component 13 may include a heating element, an insulation layer, and a temperature sensor. The heating element is wrapped around the outer wall of the gas mixing tank 10, the insulation layer is wrapped around the outside of the heating element, and the temperature sensor is installed inside the gas mixing tank 10 to monitor the temperature inside the gas mixing tank 10. The heating element can be an electric heating wire, a heating film, or other forms of heating device, and is evenly arranged on the outer wall of the gas mixing tank 10; the insulation layer can be made of high-efficiency insulation materials, such as polyurethane foam, rock wool, or aerogel, to reduce heat loss and maintain a stable temperature inside the gas mixing tank 10. A temperature sensor is used to monitor the temperature inside the gas mixing tank 10 in real time, so that the control system can adjust the power of the heating element according to the feedback signal from the temperature sensor.
[0038] Based on the above embodiments, this application also includes a steam generator connected to a gas mixing tank 10. A valve is installed on the pipeline connecting the steam generator and the gas mixing tank 10. The main function of the steam generator is to generate steam and introduce it into the gas mixing tank 10, simulating a water-vapor-containing environment. The valve on the pipeline connecting the steam generator and the gas mixing tank 10 is used to control the flow rate and on / off state of the steam. The valve can also adjust the steam flow rate to simulate exhaust gas environments under different humidity conditions. Of course, SO2 can also be added to simulate sulfur-containing exhaust gas.
[0039] Based on the above embodiments, this application embodiment also includes a hydrogen leak detector 14 and an alarm device. The hydrogen leak detector 14 is connected to the alarm device, and the alarm device generates an alarm signal when the hydrogen content detected by the hydrogen leak detector 14 exceeds a preset value.
[0040] The hydrogen leak detector 14 can employ a catalytic combustion sensor, a semiconductor sensor, or an electrochemical sensor to detect changes in the concentration of hydrogen in the environment. The hydrogen leak detector 14 is connected to an alarm device via cable or wireless signal. The main function of the alarm device is to issue an alarm signal (audible alarm or flashing warning light) when the hydrogen leak detector 14 detects that the hydrogen content exceeds a preset value, alerting operators to take action. The hydrogen leak detector 14 can be installed at the inlet and outlet of the gas mixing tank 10, as well as at pipeline connections. By installing the hydrogen leak detector 14, the hydrogen concentration in the environment can be monitored in real time, ensuring that operators are always aware of the safety situation; the alarm device automatically triggers an alarm when a hydrogen leak is detected, improving the reliability and response speed of the system.
[0041] Based on the above embodiments, in this application embodiment, a first pressure reducing valve 15 is provided on the pipeline connecting the first gas cylinder 1 and the first flow controller 3, and a second pressure reducing valve 16 is provided on the pipeline connecting the second gas cylinder 2 and the second flow controller 4.
[0042] The main function of the pressure reducing valve is to reduce and stabilize the pressure of gas. The gas pressure inside the cylinder is usually high, and the pressure reducing valve can reduce the pressure of the high-pressure gas to the required low-pressure level and maintain a stable output pressure. The first pressure reducing valve 15 reduces the pressure of the high-pressure oxygen-deficient gas in the first gas cylinder 1 to the required low-pressure level, ensuring that the gas reaches the appropriate pressure before entering the first flow controller 3; the second pressure reducing valve 16 reduces the pressure of the high-pressure oxygen-enriched gas in the second gas cylinder 2 to the required low-pressure level, ensuring that the gas reaches the appropriate pressure before entering the second flow controller 4.
[0043] Based on the above embodiments, the pipeline connecting the gas mixing tank 10 and the three-way catalyst reactor 8 in this application embodiment is wrapped with a heat insulation layer.
[0044] Common insulation materials include polyurethane foam, rock wool, fiberglass, or aerogel. These materials have excellent thermal insulation properties and can effectively reduce heat loss. The insulation layer ensures that the gas maintains the required temperature during transport by reducing heat transfer. By reducing heat loss, the insulation layer ensures that the gas maintains a stable temperature before entering the triple-effect catalytic reactor 8, which not only improves the accuracy and repeatability of the experiment but also reduces energy consumption and enhances the overall efficiency and safety of the system.
[0045] The above provides a detailed description of a gas supply device for simulating an oxygen-deficient atmosphere in automobile exhaust. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims.
[0046] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. An air supply device for simulating an oxygen-depleted atmosphere of an automobile exhaust, characterized by comprising: include: First gas cylinder (1), second gas cylinder (2), first flow controller (3), second flow controller (4), first three-way valve (5), second three-way valve (6) and mass spectrometer (7); The first gas cylinder (1) is used to store oxygen-deficient gas, and the second gas cylinder (2) is used to store oxygen-enriched gas. The first gas cylinder (1) is connected to the first three-way valve (5). The first flow controller (3) is installed on the pipeline connecting the first three-way valve (5) and the first gas cylinder (1). The second gas cylinder (2) is connected to the second three-way valve (6). The second flow controller (4) is installed on the pipeline connecting the second three-way valve (6) and the second gas cylinder (2). The mass spectrometer (7) is connected to the first three-way valve (5) and the second three-way valve (6) respectively. The first three-way valve (5) and the second three-way valve (6) are used to connect to the three-way catalyst reactor (8).
2. The gas supply device for simulating an oxygen-depleted atmosphere of an automobile exhaust according to claim 1, wherein It also includes a main pipe (9) and a gas mixing tank (10). The first end of the main pipe (9) is connected to the first three-way valve (5) and the second three-way valve (6) respectively, and the second end of the main pipe (9) is connected to the gas mixing tank (10). The gas mixing tank (10) is used to connect to the three-way catalyst reactor (8).
3. The gas supply device for simulating an oxygen-depleted atmosphere of an automobile exhaust according to claim 2, wherein A first check valve (11) is provided on the pipeline connecting the first three-way valve (5) to the gas mixing tank (10), and a second check valve (12) is provided on the pipeline connecting the second three-way valve (6) to the gas mixing tank (10).
4. The gas supply device for simulating an oxygen-depleted atmosphere of an automobile exhaust according to claim 2, wherein It also includes a temperature control component (13), which is installed outside the gas mixing tank (10) and is used to regulate the temperature inside the gas mixing tank (10).
5. The gas supply device for simulating an oxygen-depleted atmosphere of an automobile exhaust according to claim 2, wherein It also includes a steam generator, which is connected to the gas mixing tank (10), and a valve is provided on the pipeline connecting the steam generator and the gas mixing tank (10).
6. The gas supply device for simulating an oxygen-depleted or enriched atmosphere of an automobile exhaust according to any one of claims 1 to 5, characterized by, It also includes a hydrogen leak detector (14) and an alarm device, wherein the hydrogen leak detector (14) is connected to the alarm device, and the alarm device generates an alarm signal when the hydrogen content detected by the hydrogen leak detector (14) exceeds a preset value.
7. The gas supply device for simulating an oxygen-depleted atmosphere of an automobile exhaust according to claim 1, wherein A first pressure reducing valve (15) is provided on the pipeline connecting the first gas cylinder (1) and the first flow controller (3), and a second pressure reducing valve (16) is provided on the pipeline connecting the second gas cylinder (2) and the second flow controller (4).
8. The gas supply device for simulating an oxygen-depleted atmosphere of an automobile exhaust according to claim 2, wherein The gas mixing tank (10) includes a tank body and a stirring device and a pressure sensor installed in the tank body. The inner wall of the tank body is provided with cross-arranged baffles.
9. The gas supply device for simulating an oxygen-depleted atmosphere of an automobile exhaust according to claim 4, wherein The temperature control component (13) includes a heating element, an insulation layer and a temperature sensor. The heating element is wrapped around the outer wall of the gas mixing tank (10), the insulation layer is wrapped around the outside of the heating element, and the temperature sensor is installed inside the gas mixing tank (10) to monitor the temperature inside the gas mixing tank (10).
10. The gas supply device for simulating an oxygen-deficient atmosphere in automobile exhaust according to claim 2, characterized in that, The pipe connecting the gas mixing tank (10) and the three-effect catalyst reactor (8) is wrapped with an insulation layer.