A method, device, equipment and medium for determining the volume of an SCR catalyst
By testing the catalytic reaction time and ammonia storage of the SCR catalyst in the engine, and combining the theoretical ammonia storage and catalytic reaction time, the volume of the SCR catalyst is determined, which solves the problem of inappropriate volume design in the existing technology, realizes the selection of SCR catalyst that meets emission requirements, and reduces costs and fuel consumption.
Patent Information
- Application Number
- CN202310253286.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-03-14
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2043-03-14
AI Technical Summary
In the existing technology, it is difficult to balance cost and emission requirements when determining the volume of the SCR catalyst. A design volume that is too large will lead to excessively high costs, while a volume that is too small will lead to excessive emissions or increased fuel consumption. In addition, the existing method fails to effectively consider the impact of factors such as engine exhaust temperature, emissions and SCR catalyst ammonia storage.
By testing the catalytic reaction time and ammonia storage of the SCR catalyst in the engine, the engine's exhaust volume is determined by combining the theoretical ammonia storage and catalytic reaction time. When the exhaust emission requirements are met, the volume of the catalyst is calculated based on the catalytic reaction time.
The appropriate SCR catalyst volume is determined according to the specific conditions of the engine, ensuring that it can effectively reduce nitrogen oxide emissions, meet emission standards and reduce fuel consumption.
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Figure CN116359425B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of engine exhaust treatment, and in particular to a method, device, equipment and medium for determining the volume of an SCR catalyst. Background Art
[0002] As society's awareness of ecological protection grows, the impact of pollutants in motor vehicle exhaust on the environment is becoming increasingly prominent. To ensure that motor vehicle exhaust meets pollutant emission standards, the exhaust is typically catalytically treated in the engine's aftertreatment system before discharge to reduce pollutant levels.
[0003] There is a selective catalytic reduction (SCR) catalyst in the engine's after-treatment system, which is used to convert nitrogen oxides (NOx) into N2 to reduce the engine's nitrogen oxides (NOx) emissions.
[0004] The design of SCR catalysts remains a difficult point. A design volume that is too large will lead to excessive costs, while a volume that is too small will result in excessive emissions or increased fuel consumption. The current method for determining the volume of SCR catalysts is to determine it based on the engine displacement, that is, there is a proportional relationship between the engine displacement and the volume of the SCR catalyst. Since the conversion efficiency of the SCR catalyst to nitrogen oxides (NOx) is also affected by many factors such as engine exhaust temperature, emissions, and the ammonia storage of the SCR catalyst, this simple method of determining the volume of the SCR catalyst based on the engine displacement is difficult to meet emission requirements. Summary of the Invention
[0005] The embodiments of the present application provide a method, device, apparatus, and medium for determining the volume of an SCR catalyst, which are used to ensure that the determined volume of the SCR catalyst better meets the exhaust emission requirements of a corresponding engine.
[0006] In a first aspect, an embodiment of the present application provides a method for determining the volume of an SCR catalyst, comprising:
[0007] testing each of the SCR catalysts in the first engine to determine the catalytic reaction time and ammonia storage of each of the SCR catalysts;
[0008] For any one of the SCR catalysts, the exhaust emission of the first engine is determined based on the theoretical ammonia storage of the any one of the SCR catalysts, the tested ammonia storage, and the catalytic reaction time, wherein the catalytic reaction time is used to characterize the reaction time of the SCR catalyst in catalytically treating the exhaust gas of the first engine; the theoretical ammonia storage of the any one of the SCR catalysts is determined based on the known conversion rate, the known ammonia storage, and the theoretical conversion rate of the any one of the SCR catalysts, wherein the known conversion rate characterizes the degree of conversion of the exhaust gas by the second engine, and the known ammonia storage characterizes the storage amount of ammonia by the second engine;
[0009] If the exhaust volume is less than a preset exhaust volume, it is determined that the SCR catalyst meets the exhaust emission requirements of the first engine, and the volume of the SCR catalyst is determined based on the catalytic reaction time.
[0010] Optionally, the determining the exhaust emission of the first engine based on the theoretical ammonia storage of any one of the SCR catalysts, the tested ammonia storage, and the catalytic reaction time includes:
[0011] determining a test conversion rate of the any one SCR catalyst based on the theoretical ammonia storage of the any one SCR catalyst, the test ammonia storage, and the catalytic reaction time;
[0012] The tail emission of the first engine is determined based on the test conversion rate of any one of the SCR catalysts and the original emission of the first engine.
[0013] Optionally, the test ammonia storage of any one of the SCR catalysts is determined by:
[0014] determining a bed temperature of the any one SCR catalyst based on the mass and specific heat of the any one SCR catalyst;
[0015] determining a conversion rate of the any one SCR catalyst at the bed temperature based on the bed temperature of the any one SCR catalyst and the theoretical conversion rate of the any one SCR catalyst;
[0016] The test ammonia storage of the any one SCR catalyst is determined based on the conversion rate of the any one SCR catalyst at the bed temperature and a preset ammonia-nitrogen ratio.
[0017] Optionally, the theoretical ammonia storage of any one of the SCR catalysts is determined by:
[0018] Taking the ratio of the theoretical conversion rate of any one SCR catalyst to the known conversion rate of the second engine as a first coefficient;
[0019] The product of any one of the first coefficients and the known ammonia storage of the second engine is taken as the theoretical ammonia storage of the any one of the SCR catalysts.
[0020] Optionally, determining the volume of the SCR catalyst based on the catalytic reaction time includes:
[0021] taking the product of the catalytic reaction time and the displacement of the first engine as a second coefficient;
[0022] The ratio of the second coefficient to the space velocity of the SCR catalyst is taken as the volume of the SCR catalyst.
[0023] In a second aspect, an embodiment of the present application further provides a device for determining the volume of an SCR catalyst, comprising:
[0024] a first determining unit, configured to test each of the SCR catalysts in a first engine, to determine a catalytic reaction time and a test ammonia storage of each of the SCR catalysts;
[0025] a second determination unit, configured to determine, for any one of the SCR catalysts, the exhaust gas emission of the first engine based on the theoretical ammonia storage of the any one of the SCR catalysts, the tested ammonia storage, and the catalytic reaction time, wherein the catalytic reaction time is used to characterize the reaction time of the SCR catalyst in catalytically treating the exhaust gas of the first engine; the theoretical ammonia storage of the any one of the SCR catalysts is determined based on the known conversion rate and the known ammonia storage of the second engine, and the theoretical conversion rate of the any one of the SCR catalysts, wherein the known conversion rate characterizes a degree of conversion of the exhaust gas by the second engine, and the known ammonia storage characterizes an amount of ammonia stored by the second engine;
[0026] The third determining unit is configured to determine whether the SCR catalyst meets the exhaust emission requirement of the first engine if the exhaust emission volume is less than a preset exhaust emission volume, and determine a volume of the SCR catalyst based on the catalytic reaction time.
[0027] Optionally, the second determining unit is specifically configured to:
[0028] determining a test conversion rate of the any one SCR catalyst based on the theoretical ammonia storage of the any one SCR catalyst, the test ammonia storage, and the catalytic reaction time;
[0029] The tail emission of the first engine is determined based on the test conversion rate of any one of the SCR catalysts and the original emission of the first engine.
[0030] Optionally, the test ammonia storage of any one of the SCR catalysts is determined by:
[0031] determining a bed temperature of the any one SCR catalyst based on the mass and specific heat of the any one SCR catalyst;
[0032] determining a conversion rate of the any one SCR catalyst at the bed temperature based on the bed temperature of the any one SCR catalyst and the theoretical conversion rate of the any one SCR catalyst;
[0033] The test ammonia storage of the any one SCR catalyst is determined based on the conversion rate of the any one SCR catalyst at the bed temperature and a preset ammonia-nitrogen ratio.
[0034] Optionally, the theoretical ammonia storage of any one of the SCR catalysts is determined by:
[0035] Taking the ratio of the theoretical conversion rate of any one SCR catalyst to the known conversion rate of the second engine as a first coefficient;
[0036] The product of any one of the first coefficients and the known ammonia storage of the second engine is taken as the theoretical ammonia storage of the any one of the SCR catalysts.
[0037] Optionally, the third determining unit is specifically configured to:
[0038] taking the product of the catalytic reaction time and the displacement of the first engine as a second coefficient;
[0039] The ratio of the second coefficient to the space velocity of the SCR catalyst is taken as the volume of the SCR catalyst.
[0040] An embodiment of the present application provides a method, device, equipment, and medium for determining the volume of an SCR catalyst. The method can test various SCR catalysts separately in a first engine, and then determine the exhaust gas emission of the first engine based on the theoretical ammonia storage, tested ammonia storage, and catalytic reaction time of any one of the SCR catalysts. After determining that the exhaust gas emission is less than a preset exhaust gas emission, that is, after the test shows that the SCR catalyst can meet the exhaust gas emission requirements of the first engine, the volume of the SCR catalyst can be directly determined by the catalytic reaction time. The volume of the SCR catalyst determined using the embodiment of the present application has been verified, and therefore the determined SCR catalyst can meet the exhaust gas emission requirements of the first engine. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0042] Figure 1 A schematic flow chart of a method for determining the volume of an SCR catalyst provided in an embodiment of the present application;
[0043] Figure 2 A schematic structural diagram of a volume determination device for an SCR catalyst provided in an embodiment of the present application;
[0044] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0045] In order to make the purpose, technical solutions and advantages of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.
[0046] In order to better select an SCR catalyst for an engine and determine the volume of the SCR catalyst so that the SCR catalyst with the determined volume meets the exhaust emission requirements of the corresponding engine, an embodiment of the present application provides a method for determining the volume of an SCR catalyst.
[0047] like Figure 1 As shown, a method for determining the volume of an SCR catalyst provided in an embodiment of the present application includes:
[0048] S101, testing each SCR catalyst in the first engine to determine the catalytic reaction time and test ammonia storage of each SCR catalyst;
[0049] S102. Determine, for any SCR catalyst, the exhaust gas of the first engine based on the theoretical ammonia storage, the measured ammonia storage, and the catalytic reaction time of the any SCR catalyst, wherein the catalytic reaction time is used to represent the reaction time of the SCR catalyst in catalytically treating the exhaust gas of the first engine; the theoretical ammonia storage of any SCR catalyst is determined based on the known conversion rate of the second engine, the known ammonia storage, and the theoretical conversion rate of any SCR catalyst, wherein the known conversion rate represents the degree of conversion of the exhaust gas by the second engine, and the known ammonia storage represents the amount of ammonia stored by the second engine;
[0050] S103: If the tail gas emission volume is less than the preset tail gas emission volume, determine that the SCR catalyst meets the tail gas emission requirements of the first engine, and determine the volume of the SCR catalyst based on the catalytic reaction time.
[0051] The method for determining the volume of an SCR catalyst provided in the embodiment of the present application can test various SCR catalysts separately in the first engine, and then determine the exhaust gas emission of the first engine based on the theoretical ammonia storage, tested ammonia storage and catalytic reaction time of any one of the SCR catalysts. After determining that the exhaust gas emission is less than the preset exhaust gas emission, that is, after the test shows that the SCR catalyst can meet the exhaust gas emission requirements of the first engine, the volume of the SCR catalyst can be directly determined by the catalytic reaction time. The volume of the SCR catalyst determined using the embodiment of the present application has been verified, and therefore the determined SCR catalyst can meet the exhaust gas emission requirements of the first engine.
[0052] In a specific implementation, the displacement of the first engine and the second engine can be the same. In this way, after the theoretical ammonia storage of any SCR catalyst is determined by the first engine, the exhaust volume determined by testing the second engine can be more accurate, thereby making the determined SCR volume more consistent with the exhaust emission requirements of the second engine.
[0053] It's worth noting that theoretical ammonia storage represents the maximum ammonia storage capacity of an SCR catalyst. There's a positive correlation between ammonia storage and conversion rate: the greater the ammonia storage, the higher the conversion rate. For any SCR catalyst, its theoretical ammonia storage capacity is unknown and must be determined through calculation.
[0054] In a specific implementation, the embodiment of the present application determines the theoretical ammonia storage of any SCR catalyst in the following manner:
[0055] The ratio of the theoretical conversion rate of any one SCR catalyst to the known conversion rate of the second engine is used as the first coefficient, that is, the theoretical conversion rate of the SCR catalyst / the known conversion rate of the second engine=the first coefficient;
[0056] The product of any first coefficient and the known ammonia storage of the second engine is taken as the theoretical ammonia storage of any SCR catalyst, that is, first coefficient*known ammonia storage of the second engine=theoretical ammonia storage of any SCR catalyst.
[0057] The theoretical conversion rate of the SCR catalyst represents the conversion rate corresponding to the maximum ammonia storage of the SCR catalyst.
[0058] In a specific implementation, the tail gas discharge of the first engine is determined based on the theoretical ammonia storage, the measured ammonia storage and the catalytic reaction time of any SCR catalyst, specifically:
[0059] Determine the test conversion rate of any SCR catalyst based on the theoretical ammonia storage, test ammonia storage and catalytic reaction time of any SCR catalyst;
[0060] The tail emission of the first engine is determined based on the tested conversion rate of any one of the SCR catalysts and the original emission of the first engine.
[0061] The test ammonia storage of any SCR catalyst is determined as follows:
[0062] determining a bed temperature of any SCR catalyst based on the mass and specific heat of any SCR catalyst;
[0063] Determine the conversion rate of any SCR catalyst at the bed temperature based on the bed temperature of any SCR catalyst and the theoretical conversion rate of any SCR catalyst;
[0064] Based on the conversion rate of any SCR catalyst at the bed temperature and the preset ammonia-nitrogen ratio, the test ammonia storage of any SCR catalyst is determined.
[0065] Specifically, in order to intuitively describe the process of determining the tail displacement of the first engine, it is explained in the form of a formula below:
[0066] T n =(T n-1 *m SCR *C SCR +V e *C e *T e ) / (V e *C e +m SCR *C SCR );
[0067] Where n represents time, and the SCR bed temperature at time n is T n , the SCR bed temperature at time n-1 is T n , m SCR Represents the mass of SCR catalyst, C SCR represents the specific heat of the SCR catalyst, V e Represents the exhaust flow of the engine, C e Represents the exhaust specific heat of the engine, T e Represents the exhaust temperature of the engine.
[0068] E=interp1(T XY ,E XY ,T n ,'linear');
[0069] Among them, E represents the conversion rate of the SCR catalyst at the bed temperature. Since the conversion rate is also affected by other factors such as ammonia storage, this is not the actual test conversion rate. interp1 represents the interpolation function, T XY Represents the test temperature of the SCR catalyst, EXY Represents the theoretical conversion rate of the SCR catalyst.
[0070] S SCR(n) =S SCR(n-1) +(ANR-E SCR(n-1) )*C NOx ;
[0071] Among them, S SCR Represents the test ammonia storage of the SCR catalyst, and ANR represents the preset ammonia nitrogen ratio (used to measure the amount of urea injected and the nitrogen oxides NO x The proportional relationship), C NOx Represents the engine's exhaust conversion capacity.
[0072] E SCR =(e^(log1 / (1-E)*S SCR(n) / S XY )-1) / e^(log1 / (1-E)*S SCR(n) / S XY ))^t;
[0073] Among them, E SCR Represents the test conversion rate of the SCR catalyst, S XY represents the theoretical conversion rate of the SCR catalyst, and t represents the catalytic reaction time.
[0074] C nox =Y NOx *E SCR ;
[0075] Among them, C nox Represents the tail discharge of the SCR catalyst, Y NOx Represents the original emission of the SCR catalyst.
[0076] In a specific implementation, the volume of the SCR catalyst is determined based on the catalytic reaction time, specifically: the product of the catalytic reaction time and the displacement of the first engine is used as the second coefficient; and the ratio of the second coefficient to the space velocity of the SCR catalyst is used as the volume of the SCR catalyst.
[0077] In a specific implementation, the urea injection amount can also be controlled and adjusted to change the preset ammonia-nitrogen ratio, so that the tail gas emission of the first engine under test is less than the preset tail gas emission, thereby meeting the tail gas emission requirements.
[0078] Based on the same concept, the present application also provides a volume determination device for an SCR catalyst, such as Figure 2 As shown, the device includes:
[0079] The first determining unit 201 is configured to test each SCR catalyst in the first engine to determine the catalytic reaction time and test ammonia storage of each SCR catalyst;
[0080] a second determining unit 202 configured to determine, for any one of the SCR catalysts, the exhaust gas of the first engine based on the theoretical ammonia storage, the tested ammonia storage, and the catalytic reaction time of the any one of the SCR catalysts, wherein the catalytic reaction time is used to characterize the reaction time of the SCR catalyst in catalytically treating the exhaust gas of the first engine; the theoretical ammonia storage of any one of the SCR catalysts is determined based on the known conversion rate of the second engine, the known ammonia storage, and the theoretical conversion rate of any one of the SCR catalysts, wherein the known conversion rate characterizes the degree of conversion of the exhaust gas by the second engine, and the known ammonia storage characterizes the amount of ammonia stored by the second engine;
[0081] The third determining unit 203 is configured to determine whether the SCR catalyst meets the exhaust emission requirements of the first engine if the exhaust volume is less than the preset exhaust volume, and determine the volume of the SCR catalyst based on the catalytic reaction time.
[0082] In a specific implementation, the second determining unit 202 is specifically configured to:
[0083] Determine the test conversion rate of any SCR catalyst based on the theoretical ammonia storage, test ammonia storage and catalytic reaction time of any SCR catalyst;
[0084] The tail emission of the first engine is determined based on the tested conversion rate of any one of the SCR catalysts and the original emission of the first engine.
[0085] In a specific implementation, the test ammonia storage of any SCR catalyst is determined by:
[0086] determining a bed temperature of any SCR catalyst based on the mass and specific heat of any SCR catalyst;
[0087] Determine the conversion rate of any SCR catalyst at the bed temperature based on the bed temperature of any SCR catalyst and the theoretical conversion rate of any SCR catalyst;
[0088] Based on the conversion rate of any SCR catalyst at the bed temperature and the preset ammonia-nitrogen ratio, the test ammonia storage of any SCR catalyst is determined.
[0089] In a specific implementation, the theoretical ammonia storage of any SCR catalyst is determined as follows:
[0090] The ratio of the theoretical conversion rate of any one SCR catalyst to the known conversion rate of the second engine is used as a first coefficient;
[0091] The product of any one of the first coefficients and the known ammonia storage of the second engine is taken as the theoretical ammonia storage of any one of the SCR catalysts.
[0092] In a specific implementation, the third determining unit 203 is specifically configured to:
[0093] The product of the catalytic reaction time and the displacement of the first engine is used as the second coefficient;
[0094] The ratio of the second coefficient to the space velocity of the SCR catalyst is taken as the volume of the SCR catalyst.
[0095] Based on the same concept, the embodiment of the present application also provides an electronic device, the implementation of the electronic device can refer to the implementation of the above method, and the repeated parts will not be repeated. Figure 3 As shown, the electronic device includes a memory 301 and a processor 302;
[0096] The memory 301 is used to store instructions;
[0097] The processor 302 is configured to execute instructions stored in the memory 301 . When the processor 302 executes the instructions stored in the memory, the device is enabled to execute any one of the above methods for determining the volume of the SCR catalyst.
[0098] Furthermore, an embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores instructions, which, when executed on a computer, enable the computer to execute any of the above-mentioned methods for determining the volume of an SCR catalyst.
[0099] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.
[0100] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0101] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.
[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.
[0103] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.
Claims
1. A method for determining the volume of an SCR catalyst, characterized in that: include: testing each of the SCR catalysts in the first engine to determine the catalytic reaction time and ammonia storage of each of the SCR catalysts; For any one of the SCR catalysts, the exhaust emission of the first engine is determined based on the theoretical ammonia storage of the any one of the SCR catalysts, the tested ammonia storage, and the catalytic reaction time, wherein the catalytic reaction time is used to characterize the reaction time of the SCR catalyst in catalytically treating the exhaust gas of the first engine; the theoretical ammonia storage of the any one of the SCR catalysts is determined based on the known conversion rate, the known ammonia storage, and the theoretical conversion rate of the any one of the SCR catalysts, wherein the known conversion rate characterizes the degree of conversion of the exhaust gas by the second engine, and the known ammonia storage characterizes the storage amount of ammonia by the second engine; If the tail gas displacement is less than the preset tail gas displacement, it is determined that the SCR catalyst meets the tail gas emission requirements of the first engine, and the product of the catalytic reaction time and the displacement of the first engine is used as the second coefficient; and the ratio of the second coefficient to the space velocity of the SCR catalyst is used as the volume of the SCR catalyst.
2. The method according to claim 1, wherein The determining the exhaust emission of the first engine based on the theoretical ammonia storage of any one of the SCR catalysts, the tested ammonia storage, and the catalytic reaction time includes: determining a test conversion rate of the any one SCR catalyst based on the theoretical ammonia storage of the any one SCR catalyst, the test ammonia storage, and the catalytic reaction time; The tail emission of the first engine is determined based on the test conversion rate of any one of the SCR catalysts and the original emission of the first engine.
3. The method according to claim 1, wherein The test ammonia storage of any one of the SCR catalysts is determined by: determining a bed temperature of the any one SCR catalyst based on the mass and specific heat of the any one SCR catalyst; determining a conversion rate of the any one SCR catalyst at the bed temperature based on the bed temperature of the any one SCR catalyst and the theoretical conversion rate of the any one SCR catalyst; The test ammonia storage of the any one SCR catalyst is determined based on the conversion rate of the any one SCR catalyst at the bed temperature and a preset ammonia-nitrogen ratio.
4. The method according to claim 1, wherein The theoretical ammonia storage of any one of the SCR catalysts is determined as follows: Taking the ratio of the theoretical conversion rate of any one SCR catalyst to the known conversion rate of the second engine as a first coefficient; The product of any one of the first coefficients and the known ammonia storage of the second engine is taken as the theoretical ammonia storage of the any one of the SCR catalysts.
5. A volume determination device for an SCR catalyst, characterized in that: include: a first determining unit, configured to test each of the SCR catalysts in a first engine, to determine a catalytic reaction time and a test ammonia storage of each of the SCR catalysts; a second determination unit, configured to determine, for any one of the SCR catalysts, the exhaust gas emission of the first engine based on the theoretical ammonia storage of the any one of the SCR catalysts, the tested ammonia storage, and the catalytic reaction time, wherein the catalytic reaction time is used to characterize the reaction time of the SCR catalyst in catalytically treating the exhaust gas of the first engine; the theoretical ammonia storage of the any one of the SCR catalysts is determined based on the known conversion rate and the known ammonia storage of the second engine, and the theoretical conversion rate of the any one of the SCR catalysts, wherein the known conversion rate characterizes a degree of conversion of the exhaust gas by the second engine, and the known ammonia storage characterizes an amount of ammonia stored by the second engine; a third determination unit, configured to determine, if the tail emission volume is less than a preset tail emission volume, that the SCR catalyst meets the tail emission requirements of the first engine, and to use the product of the catalytic reaction time and the displacement of the first engine as a second coefficient; and to use the ratio of the second coefficient to the space velocity of the SCR catalyst as the volume of the SCR catalyst.
6. The device according to claim 5, characterized in that The second determining unit is specifically configured to: determining a test conversion rate of the any one SCR catalyst based on the theoretical ammonia storage of the any one SCR catalyst, the test ammonia storage, and the catalytic reaction time; The tail emission of the first engine is determined based on the test conversion rate of any one of the SCR catalysts and the original emission of the first engine.
7. The device according to claim 5, characterized in that The test ammonia storage of any one of the SCR catalysts is determined by: determining a bed temperature of the any one SCR catalyst based on the mass and specific heat of the any one SCR catalyst; determining a conversion rate of the any one SCR catalyst at the bed temperature based on the bed temperature of the any one SCR catalyst and the theoretical conversion rate of the any one SCR catalyst; The test ammonia storage of the any one SCR catalyst is determined based on the conversion rate of the any one SCR catalyst at the bed temperature and a preset ammonia-nitrogen ratio.
8. An electronic device, characterized in that: including memory and processor; The memory is used to store instructions; The processor is configured to execute instructions stored in the memory. When the processor executes the instructions stored in the memory, the electronic device executes the method according to any one of claims 1 to 4.
9. A computer storage medium, characterized in that The computer storage medium stores instructions, which, when executed on a computer, enable the computer to execute the method according to any one of claims 1 to 4.
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