CN112505235A - Method, device, equipment and storage medium for determining distribution amount of substances in SCR - Google Patents
Method, device, equipment and storage medium for determining distribution amount of substances in SCR Download PDFInfo
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Abstract
The invention provides a method, a device, equipment and a storage medium for determining the distribution amount of substances in SCR (selective catalytic reduction), wherein the current air inlet flow and the current air inlet temperature of an SCR to-be-detected element are obtained; dividing an SCR (selective catalytic reduction) to-be-detected piece into a plurality of different areas; determining a flow field speed uniformity coefficient used in the calculation from a preset flow field speed uniformity coefficient group matched with the flow and the temperature; determining an ammonia distribution uniformity coefficient used in the calculation from a preset ammonia distribution uniformity coefficient group matched with the flow and the temperature; obtaining the spraying amount of the ammonia compound of the SCR piece to be detected; respectively calculating reactant distribution quantities of different areas according to the flow field velocity uniformity coefficient and the current air inlet flow; and respectively calculating the ammonia gas storage amount of each different area according to the determined ammonia distribution uniformity coefficient and the ammonia compound injection amount. The invention can realize the accurate calculation of the distribution condition of the reactant of the SCR reaction in the SCR, thereby further showing the SCR reaction effect.
Description
Technical Field
The invention relates to the technical field of aftertreatment systems, in particular to a method, a device, equipment and a storage medium for determining the distribution amount of substances in SCR.
Background
The SCR tail gas post-treatment technology of the diesel engine aims at Nitrogen Oxides (NOX) with high content in tail gas discharged by the engine, and a special vehicle-mounted SCR post-treatment system is used for treating the Nitrogen Oxides (NOX) so as to achieve the purpose of reducing nitrogen oxides in the tail gas.
Since the SCR reaction is a chemical reaction, i.e. the reaction effect of the SCR is influenced by the amount of the reactant, i.e. the distribution of the reactant in the SCR determines the effect of the SCR reaction to some extent, there is no established method for the distribution of the reactant in the SCR.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a storage medium for determining the distribution amount of substances in SCR (selective catalytic reduction) so as to accurately calculate the distribution condition of reactants of SCR reaction in SCR, thereby further embodying the effect of the SCR reaction. The specific technical scheme is as follows:
in a first aspect, a method of determining the amount of material dispensed in an SCR, comprises:
obtaining the current air inlet flow and the current air inlet temperature of the SCR to-be-detected piece;
dividing the SCR to-be-detected part into a plurality of different areas;
determining a flow field speed uniformity coefficient used for calculating the reactant distribution quantity of each different area of the SCR piece to be tested from a preset flow field speed uniformity coefficient group matched with the current intake air flow and the current intake air temperature, wherein the preset flow field speed uniformity coefficient group comprises flow field speed uniformity coefficients of a plurality of different areas;
determining ammonia distribution uniformity coefficients used for calculating ammonia gas storage amounts of different areas of the SCR piece to be tested at this time from a preset ammonia distribution uniformity coefficient group matched with the current intake air flow and the current intake air temperature, wherein the preset ammonia distribution uniformity coefficient group comprises ammonia distribution uniformity coefficients of a plurality of different areas;
obtaining the spraying amount of the ammonia compound sprayed into the SCR piece to be detected;
respectively calculating reactant distribution quantities of different areas of the SCR to-be-measured piece according to the determined flow field speed uniformity coefficients and the current intake air flow;
and respectively calculating the ammonia gas storage amount of each different area of the SCR to-be-detected piece according to the determined ammonia distribution uniformity coefficient and the ammonia compound injection amount.
With reference to the first aspect, in certain alternative embodiments, the set of preset flow field velocity uniformity coefficients that match both the current intake air flow rate and the current intake air temperature is determined by:
dividing an SCR (selective catalytic reduction) calibration piece into a plurality of different areas, arranging a probe in the SCR calibration piece, and respectively scanning the flow field speed of each different area of the SCR calibration piece through the probe under the condition that the air inlet flow of the SCR calibration piece is equal to the current air inlet flow and the air inlet temperature of the SCR calibration piece is equal to the current air inlet temperature so as to obtain the preset flow field speed uniformity coefficient set;
and matching a plurality of different areas obtained by dividing the SCR standard part with a plurality of different areas obtained by dividing the SCR standard part.
With reference to the first aspect, in certain alternative embodiments, the set of preset ammonia distribution uniformity coefficients that match both the current intake air flow rate and the current intake air temperature is determined by:
dividing an SCR (selective catalytic reduction) calibration piece into a plurality of different areas, arranging a probe in the SCR calibration piece, and respectively scanning ammonia distribution quantities of the different areas of the SCR calibration piece through the probe under the condition that the air inlet flow of the SCR calibration piece is equal to the current air inlet flow and the air inlet temperature of the SCR calibration piece is equal to the current air inlet temperature so as to obtain a preset ammonia distribution uniformity coefficient set;
and matching a plurality of different areas obtained by dividing the SCR standard part with a plurality of different areas obtained by dividing the SCR standard part.
With reference to the first aspect, in some alternative embodiments, the separately calculating reactant distribution amounts of different regions of the SCR dut according to the determined flow field velocity uniformity coefficients and the current intake air flow rate includes:
according to equation 1: MAP1i＝ViCalculating the distribution amount of the reactant in each different area of the SCR element to be tested, wherein i is the number of each different area, and the MAP1iIs the reactant distribution of the region numbered i, said ViIs the flow field velocity uniformity coefficient of the region numbered i, and P is the current intake air flow rate.
With reference to the first aspect, in certain alternative embodiments, the calculating the ammonia gas storage amounts of the different regions of the SCR workpiece according to the determined ammonia distribution uniformity coefficients and the ammonia compound injection amounts respectively includes:
according to equation 2: MAP2i＝NiCalculating the ammonia gas storage amount of each different area of the SCR element to be tested by multiplying by K, wherein i is the number of each different area, and MAP2iIs the ammonia gas storage amount of the area numbered i, NiThe ammonia distribution uniformity coefficient of the region numbered i is shown, and K is the amount of the ammonia compound injected.
With reference to the first aspect, in certain optional embodiments, the method further comprises: and inputting the reactant distribution amount of each different area of the SCR piece to be tested into a product calculation model trained in advance to obtain the SCR reaction effect of the SCR piece to be tested.
In a second aspect, an apparatus for determining the amount of material dispensed in an SCR, comprises: the device comprises an air inlet parameter obtaining unit, a region dividing unit, a first determining unit, a second determining unit, an ammonia compound parameter obtaining unit, a first calculating unit and a second calculating unit;
the air inlet parameter obtaining unit is configured to obtain the current air inlet flow and the current air inlet temperature of the SCR piece to be tested;
the region dividing unit is configured to divide the SCR device under test into a plurality of different regions;
the first determination unit is configured to perform determination of a flow field speed uniformity coefficient used for calculating reactant distribution amounts of different regions of the SCR device under test this time from a preset flow field speed uniformity coefficient group matched with both the current intake air flow rate and the current intake air temperature, wherein the preset flow field speed uniformity coefficient group comprises flow field speed uniformity coefficients of a plurality of different regions;
the second determining unit is configured to determine ammonia distribution uniformity coefficients used for calculating the ammonia gas storage amount of different areas of the SCR device under test at this time from a preset ammonia distribution uniformity coefficient set matched with the current intake air flow rate and the current intake air temperature, wherein the preset ammonia distribution uniformity coefficient set comprises ammonia distribution uniformity coefficients of a plurality of different areas;
the ammonia compound parameter obtaining unit is configured to execute obtaining of the injection amount of the ammonia compound injected into the SCR piece to be tested;
the first calculation unit is configured to calculate reactant distribution amounts of different areas of the SCR element to be tested according to the determined flow field speed uniformity coefficients and the current intake air flow rate;
and the second calculation unit is configured to calculate and obtain ammonia gas storage amounts of different areas of the SCR piece to be tested according to the determined ammonia distribution uniformity coefficients and the ammonia compound injection amount.
In combination with the second aspect, in certain alternative embodiments, the apparatus further comprises: a reaction effect unit;
the reaction effect unit is configured to input the reactant distribution amount of each different area of the SCR device to be tested into a product calculation model trained in advance to obtain the SCR reaction effect of the SCR device to be tested
In a third aspect, a storage medium stores a program that when executed by a processor implements a method of determining a substance dispensation amount in an SCR as defined in any one of the above.
In a fourth aspect, an apparatus for determining the amount of material dispensed in an SCR, the apparatus comprising at least one processor, and at least one memory connected to the processor, a bus; the processor and the memory complete mutual communication through the bus; the processor is configured to invoke a program in the memory, the program at least being configured to implement the method of determining a substance dispensation amount in an SCR according to any one of the above.
The method, the device, the equipment and the storage medium for determining the distribution amount of the substances in the SCR can accurately calculate the distribution condition of the reactants of the SCR reaction in the SCR, so that the SCR reaction effect is further embodied. Of course, it is not necessary for any product or method of practicing the invention to achieve all of the above-described advantages at the same time.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of determining the amount of material dispensed in an SCR;
FIG. 2 is a schematic diagram of an apparatus for determining the amount of material dispensed from an SCR;
FIG. 3 is a schematic diagram of an apparatus for determining the amount of material dispensed in an SCR.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in FIG. 1, the present invention provides a method of determining the amount of material dispensed in an SCR comprising:
s100, obtaining the current air inlet flow and the current air inlet temperature of the SCR to-be-detected piece;
alternatively, the SCR device under test described herein may be an SCR on a specific vehicle, which is not limited in the present invention.
Optionally, a gas flow sensor may be disposed at the gas inlet of the SCR to-be-detected piece to acquire and obtain the current gas inflow rate of the SCR to-be-detected piece, which is not limited in the present invention.
Alternatively, the current intake air flow rate may be a flow rate of a mixed gas entering the SCR device under test, and the mixed gas may include air containing urea and gas discharged from the DPF or DOC, which is not limited by the invention.
Optionally, a temperature sensor may be disposed at an air inlet of the SCR to-be-detected piece to acquire a current air inlet temperature of the SCR to-be-detected piece, which is not limited in the present invention.
Alternatively, the current intake temperature may be a temperature of a mixture gas entering the SCR device under test, and the mixture gas may include air containing urea and gas discharged from the DPF or DOC, which is not limited by the present invention.
S200, dividing the SCR piece to be tested into a plurality of different areas;
optionally, the SCR to-be-tested component may be divided into a plurality of different areas according to a preset rule. For example, the SCR dut is divided into a plurality of different regions in the radial direction or the lateral direction, which is not limited by the present invention.
Optionally, the SCR to-be-tested piece is divided into a plurality of different areas, which may be beneficial to subsequently and respectively calculating the reactant distribution amount of each different area, so as to obtain the reactant distribution condition in the SCR to-be-tested piece, which is not limited in the present invention.
Optionally, the specific number of the SCR to-be-tested components divided into the plurality of different regions is not limited in the present invention, and may be selected according to actual situations.
S300, determining flow field speed uniformity coefficients used for calculating reactant distribution quantities of different areas of the SCR piece to be tested from a preset flow field speed uniformity coefficient group matched with the current intake air flow and the current intake air temperature, wherein the preset flow field speed uniformity coefficient group comprises flow field speed uniformity coefficients of a plurality of different areas;
optionally, the present invention may further provide another preset flow field speed uniformity coefficient set, where the current intake air flow rate matched with the other preset flow field speed uniformity coefficient set is different from the current intake air flow rate matched with the preset flow field speed uniformity coefficient set, or the current intake air temperature matched with the other preset flow field speed uniformity coefficient set is different from the current intake air temperature matched with the preset flow field speed uniformity coefficient set.
Optionally, each element in the preset flow field speed uniformity coefficient group corresponds to each different region of the SCR to-be-tested piece, that is, one element in the preset flow field speed uniformity coefficient group corresponds to one region of the SCR to-be-tested piece.
Optionally, the set of preset flow field velocity uniformity coefficients may be a set of preset coefficients obtained from experimental tests, for example, in conjunction with the embodiment shown in fig. 1, in some optional embodiments, the set of preset flow field velocity uniformity coefficients matching both the current intake air flow rate and the current intake air temperature is determined by:
dividing an SCR (selective catalytic reduction) calibration piece into a plurality of different areas, arranging a probe in the SCR calibration piece, and respectively scanning the flow field speed of each different area of the SCR calibration piece through the probe under the condition that the air inlet flow of the SCR calibration piece is equal to the current air inlet flow and the air inlet temperature of the SCR calibration piece is equal to the current air inlet temperature so as to obtain the preset flow field speed uniformity coefficient set;
and matching a plurality of different areas obtained by dividing the SCR standard part with a plurality of different areas obtained by dividing the SCR standard part.
Optionally, each element of the preset flow field velocity uniformity coefficient set may respectively represent a mass ratio, a weight ratio, or a volume ratio of the reactants in each different region to all the reactants in the whole SCR, which is not limited in the present invention.
Optionally, in order to improve the accuracy of determining the reactant distribution condition of the SCR reaction by using the preset flow field speed uniformity coefficient set, when the preset flow field speed uniformity coefficient set is set, the manner of dividing the SCR to-be-detected component into a plurality of different regions may be the same as the manner of dividing the SCR standard component into a plurality of different regions, which is not limited in the present invention.
S400, determining ammonia distribution uniformity coefficients used for calculating ammonia gas storage quantities of different areas of the SCR piece to be tested at this time from a preset ammonia distribution uniformity coefficient group matched with the current intake air flow and the current intake air temperature, wherein the preset ammonia distribution uniformity coefficient group comprises ammonia distribution uniformity coefficients of a plurality of different areas;
alternatively, ammonia gas is essential in carrying out the SCR reaction, although the amount of ammonia gas used is small for the other reactants. The ammonia gas storage amounts of different areas of the SCR test piece can be determined separately in this step, specifically calculated by presetting each element of the ammonia distribution uniformity coefficient set.
Optionally, the present invention may further provide another preset ammonia distribution uniformity coefficient set, where the current intake air flow rate matched with the other preset ammonia distribution uniformity coefficient set is different from the current intake air flow rate matched with the preset flow field speed uniformity coefficient set, or the current intake air temperature matched with the other preset ammonia distribution uniformity coefficient set is different from the current intake air temperature matched with the preset ammonia distribution uniformity coefficient set.
Optionally, each element in the preset ammonia distribution uniformity coefficient group corresponds to each different region of the SCR to-be-tested piece, that is, one element in the preset ammonia distribution uniformity coefficient group corresponds to one region of the SCR to-be-tested piece.
Alternatively, the set of preset ammonia distribution uniformity coefficients may be a set of preset coefficients obtained from experimental tests, for example, in conjunction with the embodiment shown in fig. 1, in some alternative embodiments, the set of preset ammonia distribution uniformity coefficients matching both the current intake air flow rate and the current intake air temperature is determined by:
dividing an SCR (selective catalytic reduction) calibration piece into a plurality of different areas, arranging a probe in the SCR calibration piece, and respectively scanning ammonia distribution quantities of the different areas of the SCR calibration piece through the probe under the condition that the air inlet flow of the SCR calibration piece is equal to the current air inlet flow and the air inlet temperature of the SCR calibration piece is equal to the current air inlet temperature so as to obtain a preset ammonia distribution uniformity coefficient set;
and matching a plurality of different areas obtained by dividing the SCR standard part with a plurality of different areas obtained by dividing the SCR standard part.
Optionally, each element of the preset ammonia distribution uniformity coefficient set may respectively represent a mass ratio, a weight ratio, or a volume ratio of ammonia gas in each different region to ammonia gas in the whole SCR, which is not limited in the present invention.
Optionally, in order to improve the accuracy of determining the reactant distribution condition of the SCR reaction by using the preset ammonia distribution uniformity coefficient set, when the preset ammonia distribution uniformity coefficient set is set, a manner of dividing the SCR to-be-tested component into a plurality of different regions may be the same as a manner of dividing the SCR standard component into a plurality of different regions, which is not limited in the present invention.
S500, obtaining the spraying amount of the ammonia compound sprayed into the SCR piece to be detected;
alternatively, urea may be injected into the diesel SCR, and the urea is decomposed at high temperature to generate ammonia gas, i.e. the ammonia compound may be urea or ammonia gas, which is not limited in the present invention.
S600, respectively calculating reactant distribution quantities of different areas of the SCR to-be-detected piece according to the determined flow field speed uniformity coefficients and the current intake air flow;
alternatively, the reactant distribution amounts described herein may cover the distribution amount of the oxynitride compound and the distribution amount of the ammonia compound, which is not limited by the present invention.
Optionally, the flow field velocity uniformity coefficients of different regions of the SCR to-be-tested object may be different, which is more practical, because the distribution of the reactant in different regions of the SCR may not be completely the same, but may be different to some extent, the reactant distribution amounts in different regions calculated according to the flow field velocity uniformity coefficients of different regions and the same current intake air flow rate are different.
For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the step S600 includes:
according to equation 1: MAP1i＝ViCalculating the distribution amount of the reactant in each different area of the SCR element to be tested, wherein i is the number of each different area, and the MAP1iIs the reactant distribution of the region numbered i, said ViIs the flow field velocity uniformity coefficient of the region numbered i, and P is the current intake air flow rate.
Alternatively, the reactant distribution amounts of the different regions of the SCR device under test may be calculated based on formula 1, which is not limited in the present invention.
S700, respectively calculating ammonia gas storage quantities of different areas of the SCR to-be-detected piece according to the determined ammonia distribution uniformity coefficients and the ammonia compound injection quantities.
Optionally, the ammonia distribution uniformity coefficient represents the distribution condition of ammonia gas in different areas of the SCR workpiece to be tested, so that the ammonia gas storage amount of the different areas of the SCR workpiece to be tested can be calculated based on the ammonia distribution uniformity coefficient and the injection amount of the ammonia compound.
Optionally, it is considered that the ammonia compound is not continuously injected all the time when the diesel vehicle is in use, but the ammonia compound is injected into the SCR only when it is determined that the ammonia compound needs to be supplemented to the SCR. The ammonia compounds injected into the SCR will adhere to each zone and can participate in the SCR reaction as a reactant for a period of time until the ammonia compounds in the SCR are again replenished below a predetermined level of consumption. Based on the characteristics, the ammonia gas storage amount of different areas of the SCR piece to be detected can be gradually reduced along with the progress of the SCR reaction. Therefore, the injection amount of the ammonia compound can be understood as the injection amount of the ammonia compound which is injected last time, and the current ammonia gas storage amount of each different area of the SCR to-be-detected element can be calculated according to the ammonia distribution uniformity coefficient of each different area, the injection amount of the ammonia compound and the time length of the current time which is far away from the moment of the ammonia compound which is injected last time.
Optionally, in addition to consideration from the time axis, consideration may also be given to the reaction time of the SCR reaction, that is, from the time when the ammonia compound is injected last time to how much time the SCR reaction is currently performed in an accumulated manner, according to the time, how much ammonia gas is consumed and how much ammonia gas remains, which is not limited in the present invention.
For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the step S700 includes:
according to equation 2: MAP2i＝NiCalculating the ammonia gas storage amount of each different area of the SCR element to be tested by multiplying by K, wherein i is the number of each different area, and MAP2iIs the ammonia gas storage amount of the area numbered i, NiThe ammonia distribution uniformity coefficient of the region numbered i is shown, and K is the amount of the ammonia compound injected.
Alternatively, the SCR reaction is actually a chemical reaction, according to the characteristics of the chemical reaction: the amount or state of the product can affect the rate of the chemical reaction and the amount of the product. The SCR reaction effect can be obtained based on the reactant distribution amount calculated in the embodiment of fig. 1. Given that the outcome of a chemical reaction is influenced by a number of factors, a mechanistic model can be used to determine the effectiveness of the SCR reaction.
For example, in connection with the embodiment shown in fig. 1, in certain alternative embodiments, the method further comprises: and inputting the reactant distribution amount of each different area of the SCR piece to be tested into a product calculation model trained in advance to obtain the SCR reaction effect of the SCR piece to be tested.
As shown in FIG. 2, the present invention provides an apparatus for determining the amount of material dispensed in an SCR comprising: an intake air parameter obtaining unit 100, a region dividing unit 200, a first determining unit 300, a second determining unit 400, an ammonia compound parameter obtaining unit 500, a first calculating unit 600, and a second calculating unit 700;
the intake parameter obtaining unit 100 is configured to perform obtaining of a current intake air flow and a current intake air temperature of the SCR workpiece to be tested;
the region dividing unit 200 is configured to divide the SCR device under test into a plurality of different regions;
the first determining unit 300 is configured to perform determining a flow field speed uniformity coefficient used for calculating reactant distribution amounts of different regions of the SCR workpiece to be tested at this time from a preset flow field speed uniformity coefficient group matched with both the current intake air flow rate and the current intake air temperature, wherein the preset flow field speed uniformity coefficient group includes flow field speed uniformity coefficients of a plurality of different regions;
the second determining unit 400 is configured to perform determining ammonia distribution uniformity coefficients used for calculating ammonia gas storage amounts of different regions of the SCR device under test at this time from a preset ammonia distribution uniformity coefficient set matched with both the current intake air flow rate and the current intake air temperature, wherein the preset ammonia distribution uniformity coefficient set includes ammonia distribution uniformity coefficients of a plurality of different regions;
the ammonia compound parameter obtaining unit 500 is configured to execute obtaining of an injection amount of the ammonia compound injected into the SCR device under test;
the first calculation unit 600 is configured to perform calculation to obtain reactant distribution amounts of different areas of the SCR workpiece to be tested according to the determined flow field velocity uniformity coefficients and the current intake air flow rate;
the second calculating unit 700 is configured to calculate ammonia gas storage amounts of different areas of the SCR workpiece to be tested according to the determined ammonia distribution uniformity coefficients and the ammonia compound injection amounts.
In some alternative embodiments, in combination with the embodiment shown in fig. 2, the apparatus further comprises: a reaction effect unit;
the reaction effect unit is configured to input the reactant distribution amount of each different area of the SCR device to be tested into a product calculation model trained in advance to obtain the SCR reaction effect of the SCR device to be tested
In some optional embodiments, in combination with the embodiment shown in fig. 2, the first computing unit 600 includes: a first calculation subunit;
the first calculating subunit configured to perform the following according to equation 1: MAP1i＝ViCalculating the distribution amount of the reactant in each different area of the SCR element to be tested, wherein i is the number of each different area, and the MAP1iIs the reactant distribution of the region numbered i, said ViIs the flow field velocity uniformity coefficient of the region numbered i, and P is the current intake air flow rate.
In some optional embodiments, in combination with the embodiment shown in fig. 2, the second computing unit 700 includes: a second calculation subunit;
the second calculation subunit configured to perform, according to equation 2: MAP2i＝NiCalculating the ammonia gas storage amount of each different area of the SCR element to be tested by multiplying by K, wherein i is the number of each different area, and MAP2iIs the ammonia gas storage amount of the area numbered i, NiThe ammonia distribution uniformity coefficient of the region numbered i is shown, and K is the amount of the ammonia compound injected.
The device for determining the distribution amount of the substances in the SCR comprises a processor and a memory, wherein the intake air parameter obtaining unit 100, the area dividing unit 200, the first determining unit 300, the second determining unit 400, the ammonia compound parameter obtaining unit 500, the first calculating unit 600, the second calculating unit 700 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. One or more than one kernel can be set, and the distribution condition of the reactant of the SCR reaction in the SCR can be accurately calculated by adjusting the kernel parameters, so that the SCR reaction effect is further embodied.
An embodiment of the present invention provides a storage medium having a program stored thereon, which when executed by a processor, implements the method of determining a substance dispensation amount in an SCR.
An embodiment of the invention provides a processor for running a program, wherein the program is run to perform the method for determining the amount of material dispensed in an SCR.
As shown in fig. 3, an embodiment of the present invention provides an apparatus 70 for determining the amount of material dispensed in an SCR, the apparatus 70 comprising at least one processor 701, and at least one memory 702 coupled to the processor 701, a bus 703; the processor 701 and the memory 702 complete mutual communication through a bus 703; the processor 701 is configured to call program instructions in the memory 702 to perform the above-described method of determining the amount of material dispensed in an SCR. The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application also provides a computer program product adapted to perform a program initialized with the steps comprised in the method of determining the amount of a substance dispensed in an SCR as described above, when executed on a data processing device.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a device includes one or more processors (CPUs), memory, and a bus. The device may also include input/output interfaces, network interfaces, and the like.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip. The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method of determining the amount of material dispensed in an SCR comprising:
obtaining the current air inlet flow and the current air inlet temperature of the SCR to-be-detected piece;
dividing the SCR to-be-detected part into a plurality of different areas;
determining a flow field speed uniformity coefficient used for calculating the reactant distribution quantity of each different area of the SCR piece to be tested from a preset flow field speed uniformity coefficient group matched with the current intake air flow and the current intake air temperature, wherein the preset flow field speed uniformity coefficient group comprises flow field speed uniformity coefficients of a plurality of different areas;
determining ammonia distribution uniformity coefficients used for calculating ammonia gas storage amounts of different areas of the SCR piece to be tested at this time from a preset ammonia distribution uniformity coefficient group matched with the current intake air flow and the current intake air temperature, wherein the preset ammonia distribution uniformity coefficient group comprises ammonia distribution uniformity coefficients of a plurality of different areas;
obtaining the spraying amount of the ammonia compound sprayed into the SCR piece to be detected;
respectively calculating reactant distribution quantities of different areas of the SCR to-be-measured piece according to the determined flow field speed uniformity coefficients and the current intake air flow;
and respectively calculating the ammonia gas storage amount of each different area of the SCR to-be-detected piece according to the determined ammonia distribution uniformity coefficient and the ammonia compound injection amount.
2. The method of claim 1, wherein the set of preset flow field velocity uniformity coefficients that match both the current intake air flow rate and the current intake air temperature is determined by:
dividing an SCR (selective catalytic reduction) calibration piece into a plurality of different areas, arranging a probe in the SCR calibration piece, and respectively scanning the flow field speed of each different area of the SCR calibration piece through the probe under the condition that the air inlet flow of the SCR calibration piece is equal to the current air inlet flow and the air inlet temperature of the SCR calibration piece is equal to the current air inlet temperature so as to obtain the preset flow field speed uniformity coefficient set;
and matching a plurality of different areas obtained by dividing the SCR standard part with a plurality of different areas obtained by dividing the SCR standard part.
3. The method of claim 1, wherein the set of preset ammonia distribution uniformity coefficients that match both the current intake air flow rate and the current intake air temperature is determined by:
dividing an SCR (selective catalytic reduction) calibration piece into a plurality of different areas, arranging a probe in the SCR calibration piece, and respectively scanning ammonia distribution quantities of the different areas of the SCR calibration piece through the probe under the condition that the air inlet flow of the SCR calibration piece is equal to the current air inlet flow and the air inlet temperature of the SCR calibration piece is equal to the current air inlet temperature so as to obtain a preset ammonia distribution uniformity coefficient set;
and matching a plurality of different areas obtained by dividing the SCR standard part with a plurality of different areas obtained by dividing the SCR standard part.
4. The method of claim 1, wherein the calculating the reactant distribution amount of each different area of the SCR dut according to the determined flow field velocity uniformity coefficient and the current intake air flow rate comprises:
according to equation 1: MAP1i＝ViCalculating the distribution amount of the reactant in each different area of the SCR element to be tested, wherein i is the number of each different area, and the MAP1iIs the reactant distribution of the region numbered i, said ViIs the flow field velocity uniformity coefficient of the region numbered i, and P is the current intake air flow rate.
5. The method as claimed in claim 1, wherein the step of calculating the ammonia gas storage amount of each different area of the SCR workpiece according to the determined ammonia distribution uniformity coefficient and the ammonia compound injection amount comprises:
according to equation 2: MAP2i＝NiCalculating the ammonia gas storage amount of each different area of the SCR element to be tested by multiplying by K, wherein i is the number of each different area, and MAP2iIs the ammonia gas storage amount of the area numbered i, NiIs the ammonia distribution uniformity coefficient of the region numbered i, and K is the spraying of the ammonia compoundAnd (4) adding amount.
6. The method of claim 1, further comprising: and inputting the reactant distribution amount of each different area of the SCR piece to be tested into a product calculation model trained in advance to obtain the SCR reaction effect of the SCR piece to be tested.
7. An apparatus for determining the amount of material dispensed in an SCR, comprising: the device comprises an air inlet parameter obtaining unit, a region dividing unit, a first determining unit, a second determining unit, an ammonia compound parameter obtaining unit, a first calculating unit and a second calculating unit;
the air inlet parameter obtaining unit is configured to obtain the current air inlet flow and the current air inlet temperature of the SCR piece to be tested;
the region dividing unit is configured to divide the SCR device under test into a plurality of different regions;
the first determination unit is configured to perform determination of a flow field speed uniformity coefficient used for calculating reactant distribution amounts of different regions of the SCR device under test this time from a preset flow field speed uniformity coefficient group matched with both the current intake air flow rate and the current intake air temperature, wherein the preset flow field speed uniformity coefficient group comprises flow field speed uniformity coefficients of a plurality of different regions;
the second determining unit is configured to determine ammonia distribution uniformity coefficients used for calculating the ammonia gas storage amount of different areas of the SCR device under test at this time from a preset ammonia distribution uniformity coefficient set matched with the current intake air flow rate and the current intake air temperature, wherein the preset ammonia distribution uniformity coefficient set comprises ammonia distribution uniformity coefficients of a plurality of different areas;
the ammonia compound parameter obtaining unit is configured to execute obtaining of the injection amount of the ammonia compound injected into the SCR piece to be tested;
the first calculation unit is configured to calculate reactant distribution amounts of different areas of the SCR element to be tested according to the determined flow field speed uniformity coefficients and the current intake air flow rate;
and the second calculation unit is configured to calculate and obtain ammonia gas storage amounts of different areas of the SCR piece to be tested according to the determined ammonia distribution uniformity coefficients and the ammonia compound injection amount.
8. The apparatus of claim 7, further comprising: a reaction effect unit;
the reaction effect unit is configured to input the reactant distribution amounts of different areas of the SCR device to be tested into a pre-trained product calculation model to obtain the SCR reaction effect of the SCR device to be tested.
9. A storage medium for storing a program which when executed by a processor implements a method of determining the amount of material dispensed in an SCR according to any one of claims 1 to 6.
10. An apparatus for determining the amount of material dispensed in an SCR, the apparatus comprising at least one processor, and at least one memory, bus connected to the processor; the processor and the memory complete mutual communication through the bus; the processor is configured to invoke a program in the memory, the program at least being configured to implement the method of determining the amount of material dispensed in an SCR according to any one of claims 1 to 6.
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