Treatment method of two-stage SCR (Selective Catalytic Reduction) aftertreatment system and related device

Abstract

The invention relates to a treatment method of a two-stage SCR aftertreatment system and a related device, the treatment method is applied to the two-stage SCR aftertreatment system, the two-stage SCR aftertreatment system comprises a front-stage reaction module and a rear-stage reaction module, and the treatment method comprises the steps that the first temperature of the front-stage reaction module and the second temperature of the rear-stage reaction module are obtained; the working mode of the two-stage SCR aftertreatment system is determined according to the first temperature and the second temperature; acquiring the concentration of a first compound input into a front-stage reaction module, the concentration of a second compound output by the front-stage reaction module and the concentration of a third compound output by a rear-stage reaction module; and determining the first medium output quantity of the front-stage reaction module and the second medium output quantity of the rear-stage reaction module. According to the scheme, under the condition that SCR has high NOX conversion efficiency, it can be guaranteed that the passive regeneration function of a DPF is basically not affected, the concentration of N2O in tail gas is reduced, and tail gas emission reaches the standard.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a processing method of a dual-stage SCR post-processing system and a related device thereof. Background Art

[0002] After a diesel engine burns diesel, it emits exhaust gas. The exhaust gas contains a variety of harmful substances, including but not limited to carbon monoxide, nitrogen oxides and carbonaceous particles. Therefore, it is necessary to strictly post-treat the exhaust gas discharged by the diesel engine.

[0003] The current general diesel engine exhaust after-treatment layout is DOC (Diesel Oxidation Catalyst) + DPF (Diesel Particulate Filter) + SCR (Selective Catalytic Reduction), but with the increase of nitrogen oxides (NO X ) and particulate matter emission requirements have been further tightened, and the limit requirements for laughing gas (N2O) have been added, requiring better treatment of exhaust gas. Dual-injection SCR post-treatment technology is one of the technical routes taken by diesel engines to further reduce emissions. The general post-treatment layout is: front-stage SCR+DOC+DPF+rear-stage SCR. When the exhaust gas from the diesel engine is input into the exhaust post-treatment system, the exhaust gas first enters the front-stage SCR to react with the ammonia generated by the decomposition of urea, and NO in the exhaust gas is reduced. X The concentration is reduced, and then it reacts with ammonia again through the rear SCR. The two-stage SCR purifies the exhaust gas step by step so that the exhaust gas finally meets the emission standards.

[0004] However, the NO eliminated by the reaction in the previous SCR X Too much can lead to dependence on NO X The passive regeneration ability of DPF is weakened, the accumulation rate of particulate matter is accelerated, and the active regeneration frequency increases accordingly, which ultimately leads to increased vehicle fuel consumption and shortened service life of the post-treatment system. X When it is too low, on the one hand, the amount of NOx emissions will increase, and on the other hand, the post-stage SCR will process NO X As the pressure increases, it is necessary to inject excessive urea to ensure that NOx emissions meet the standards. In this case, the SCR side reaction will generate more N2O, and excessive urea will increase the number of particulate matter, so that there is still a high number of N2O and particulate matter in the exhaust gas. Summary of the invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a treatment method and related device of a two-stage SCR post-treatment system, which can make the SCR have a high NO X While maintaining the conversion efficiency, the passive regeneration function of DPF can be basically unaffected, reducing the concentration of N2O in the exhaust gas and making the exhaust emissions meet the standards.

[0006] A first aspect of the present application provides a treatment method for a two-stage SCR after-treatment system, which is applied to the two-stage SCR after-treatment system, wherein the two-stage SCR after-treatment system includes a front-stage reaction module and a rear-stage reaction module, and the treatment method includes: obtaining a first temperature of the front-stage reaction module and a second temperature of the rear-stage reaction module; determining an operating mode of the two-stage SCR after-treatment system according to the first temperature and the second temperature; obtaining a concentration of a first compound input to the front-stage reaction module, a concentration of a second compound output from the front-stage reaction module, and a concentration of a third compound output from the rear-stage reaction module, wherein the first compound, the second compound, and the third compound all include at least nitrogen oxides; determining an output amount of a first medium of the front-stage reaction module and an output amount of a second medium of the rear-stage reaction module according to the concentration of the first compound, the concentration of the second compound, the concentration of the third compound, and the operating mode of the two-stage SCR after-treatment system, wherein the first medium and the second medium all include at least urea.

[0007] In combination with the first aspect, in a possible implementation of the first aspect, the operating mode of the two-stage SCR after-treatment system is determined according to the first temperature and the second temperature, including: when the first temperature is less than or equal to a first preset temperature, determining that the two-stage SCR after-treatment system is in an inert mode; when the first temperature is greater than the first preset temperature and the second temperature is less than or equal to the first preset temperature, determining that the two-stage SCR after-treatment system is in a low-temperature mode; when the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the second preset temperature, determining that the two-stage SCR after-treatment system is in a medium-temperature mode; when the second temperature is greater than the second preset temperature, determining that the two-stage SCR after-treatment system is in a high-temperature mode.

[0008] In combination with the first aspect, in a possible implementation of the first aspect, the medium temperature mode includes a low activity mode, a medium activity mode and an optimal activity mode, and when the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the second preset temperature, the two-stage SCR after-treatment system is determined to be in the medium temperature mode, including: when the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the third preset temperature, the two-stage SCR after-treatment system is determined to be in the low activity mode; when the second temperature is greater than the third preset temperature and the second temperature is less than or equal to the fourth preset temperature, the two-stage SCR after-treatment system is determined to be in the medium activity mode; when the second temperature is greater than the fourth preset temperature and the second temperature is less than or equal to the second preset temperature, the two-stage SCR after-treatment system is determined to be in the optimal activity mode.

[0009] In combination with the first aspect, in a possible implementation of the first aspect, the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module are determined according to the first compound concentration, the second compound concentration, the third compound concentration and the working mode of the two-stage SCR after-treatment system, including: calculating the first distribution coefficient of the front-stage reaction module according to the concentration of the first compound and the concentration of the second compound, the first distribution coefficient is negatively correlated with the concentration of the second compound; calculating the second distribution coefficient of the rear-stage reaction module according to the concentration of the first compound, the concentration of the second compound and the concentration of the third compound, the second distribution coefficient is positively correlated with the concentration of the second compound; determining the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module according to the first distribution coefficient, the second distribution coefficient and the working mode of the two-stage SCR after-treatment system.

[0010] In combination with the first aspect, in a possible implementation of the first aspect, the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module are determined according to the first distribution coefficient, the second distribution coefficient and the working mode of the two-stage SCR after-treatment system, including: when the first distribution coefficient is 0, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is an inert mode, the first medium output of the front-stage reaction module is determined to be 0, and the second medium output of the rear-stage reaction module is 0; when the first distribution coefficient is 1, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is a low-temperature mode, the first medium output of the front-stage reaction module is determined to be a maximum output, and the second medium output of the rear-stage reaction module is 0; when the first distribution coefficient is 1, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is a high-temperature mode, the first medium output of the front-stage reaction module is determined to be a maximum output, and the second medium output of the rear-stage reaction module is 0.

[0011] In combination with the first aspect, in a possible implementation of the first aspect, the determining the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module according to the first distribution coefficient, the second distribution coefficient and the working mode of the two-stage SCR aftertreatment system includes: when the first distribution coefficient is in the first interval, the second distribution coefficient is in the second interval, and the working mode of the two-stage SCR aftertreatment system is the low activity mode, determining the first medium output of the front-stage reaction module to be the first output, and the second medium output of the rear-stage reaction module to be the second output; when the first distribution coefficient is in the third interval, the second distribution coefficient is in the fourth interval, and the working mode of the two-stage SCR aftertreatment system is the medium activity mode, determining the first medium output of the front-stage reaction module to be the third output, and the second medium output of the rear-stage reaction module to be the fourth output, wherein the sum of the first distribution coefficient and the second distribution coefficient is 1; when the first distribution coefficient is 0, the second distribution coefficient is 1, and the working mode of the two-stage SCR aftertreatment system is the optimal activity mode, determining the first medium output of the front-stage reaction module to be 0, and the second medium output of the rear-stage reaction module to be 1.

[0012] In combination with the first aspect, in a possible implementation of the first aspect, the first distribution coefficient of the front-stage reaction module is calculated based on the concentration of the first compound and the concentration of the second compound, including: calculating the difference between the concentration of the first compound and the concentration of the second compound, to obtain a first difference; using the quotient of the first difference and the concentration of the first compound as the first distribution coefficient; the second distribution coefficient of the rear-stage reaction module is calculated based on the concentration of the first compound, the concentration of the second compound and the concentration of the third compound, including: calculating the difference between the concentration of the second compound and the concentration of the third compound, to obtain a second difference; using the quotient of the second difference and the concentration of the first compound as the second distribution coefficient.

[0013] According to a second aspect of the present application, there is provided a processing device for a two-stage SCR after-treatment system, comprising: a first acquisition module for acquiring a first temperature of a front-stage reaction module and a second temperature of a rear-stage reaction module; a first processing module for determining an operating mode of the two-stage SCR after-treatment system according to the first temperature and the second temperature; a second acquisition module for acquiring a concentration of a first compound input to the front-stage reaction module, a concentration of a second compound output from the front-stage reaction module, and a concentration of a third compound output from the rear-stage reaction module, wherein the first compound, the second compound, and the third compound all include at least nitrogen oxides; and a second processing module for determining an output amount of a first medium of the front-stage reaction module and an output amount of a second medium of the rear-stage reaction module according to the concentration of the first compound, the concentration of the second compound, the concentration of the third compound, and the operating mode of the two-stage SCR after-treatment system, wherein the first medium and the second medium all include at least urea.

[0014] In combination with the second aspect, in a possible implementation of the second aspect, the first processing module also includes when the first temperature is less than or equal to the first preset temperature, determining that the two-stage SCR after-treatment system is in an inert mode; when the first temperature is greater than the first preset temperature and the second temperature is less than or equal to the first preset temperature, determining that the two-stage SCR after-treatment system is in a low-temperature mode; when the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the second preset temperature, determining that the two-stage SCR after-treatment system is in a medium-temperature mode; when the second temperature is greater than the second preset temperature, determining that the two-stage SCR after-treatment system is in a high-temperature mode.

[0015] In combination with the second aspect, in a possible implementation of the second aspect, the first processing module also includes the medium temperature mode including a low activity mode, a medium activity mode and an optimal activity mode. When the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the third preset temperature, the two-stage SCR after-treatment system is determined to be in a low activity mode; when the second temperature is greater than the third preset temperature and the second temperature is less than or equal to the fourth preset temperature, the two-stage SCR after-treatment system is determined to be in a medium activity mode; when the second temperature is greater than the fourth preset temperature and the second temperature is less than or equal to the second preset temperature, the two-stage SCR after-treatment system is determined to be in an optimal activity mode.

[0016] In combination with the second aspect, in a possible implementation of the second aspect, the second processing module also includes calculating a first distribution coefficient of the front-stage reaction module based on the concentration of the first compound and the concentration of the second compound, and the first distribution coefficient is negatively correlated with the concentration of the second compound; calculating a second distribution coefficient of the rear-stage reaction module based on the concentration of the first compound, the concentration of the second compound and the concentration of the third compound, and the second distribution coefficient is positively correlated with the concentration of the second compound; determining a first medium output of the front-stage reaction module and a second medium output of the rear-stage reaction module based on the first distribution coefficient, the second distribution coefficient and the working mode of the two-stage SCR after-treatment system.

[0017] In combination with the second aspect, in a possible implementation of the second aspect, the second processing module also includes when the first distribution coefficient is 0, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is an inert mode, determining that the first medium output of the front-stage reaction module is 0, and the second medium output of the rear-stage reaction module is 0; when the first distribution coefficient is 1, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is a low-temperature mode, determining that the first medium output of the front-stage reaction module is the maximum output, and the second medium output of the rear-stage reaction module is 0; when the first distribution coefficient is 1, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is a high-temperature mode, determining that the first medium output of the front-stage reaction module is the maximum output, and the second medium output of the rear-stage reaction module is 0.

[0018] In combination with the second aspect, in a possible implementation of the second aspect, the second processing module also includes when the first distribution coefficient is in the first interval, the second distribution coefficient is in the second interval, and the working mode of the two-stage SCR after-treatment system is the low activity mode, determining that the first medium output of the front-stage reaction module is the first output, and the second medium output of the rear-stage reaction module is the second output; when the first distribution coefficient is in the third interval, the second distribution coefficient is in the fourth interval, and the working mode of the two-stage SCR after-treatment system is the medium activity mode, determining that the first medium output of the front-stage reaction module is the third output, and the second medium output of the rear-stage reaction module is the fourth output, wherein the sum of the first distribution coefficient and the second distribution coefficient is 1; when the first distribution coefficient is 0, the second distribution coefficient is 1, and the working mode of the two-stage SCR after-treatment system is the optimal activity mode, determining that the first medium output of the front-stage reaction module is 0, and the second medium output of the rear-stage reaction module is 1.

[0019] In combination with the second aspect, in a possible implementation of the second aspect, the second processing module also includes calculating the difference between the concentration of the first compound and the concentration of the second compound to obtain a first difference; using the quotient between the first difference and the concentration of the first compound as the first distribution coefficient; calculating the difference between the concentration of the second compound and the concentration of the third compound to obtain a second difference; using the quotient between the second difference and the concentration of the first compound as the first distribution coefficient.

[0020] A third aspect of the present application provides an electronic device, including:

[0021] Processor; and

[0022] The memory stores executable codes thereon, and when the executable codes are executed by the processor, the processor is caused to execute the method as described above.

[0023] A fourth aspect of the present application provides a computer-readable storage medium having executable code stored thereon. When the executable code is executed by a processor of an electronic device, the processor is caused to execute the method as described above.

[0024] The technical solution provided by this application may have the following beneficial effects:

[0025] The processing method of the dual-stage SCR post-treatment system of the present application and the related device thereof include an application to the dual-stage SCR post-treatment system, the dual-stage SCR post-treatment system includes a front-stage reaction module and a rear-stage reaction module, and the processing method includes: obtaining a first temperature of the front-stage reaction module and a second temperature of the rear-stage reaction module; determining the working mode of the dual-stage SCR post-treatment system according to the first temperature and the second temperature; obtaining the concentration of a first compound input to the front-stage reaction module, the concentration of a second compound output from the front-stage reaction module, and the concentration of a third compound output from the rear-stage reaction module, wherein the first compound, the second compound, and the third compound all include at least nitrogen oxides; determining the output amount of a first medium of the front-stage reaction module and the output amount of a second medium of the rear-stage reaction module according to the concentration of the first compound, the concentration of the second compound, the concentration of the third compound, and the working mode of the dual-stage SCR post-treatment system, wherein the first medium and the second medium all include at least urea, so that the SCR can be operated in a state with a relatively high NO X While maintaining the conversion efficiency, the passive regeneration function of DPF can be basically unaffected, reducing the concentration of N2O in the exhaust gas and making the exhaust emissions meet the standards.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0028] Figure 1 is a flow chart of a treatment method of a dual-stage SCR post-treatment system shown in an embodiment of the present application;

[0029] Figure 2 is a schematic structural diagram of a processing device of a dual-stage SCR post-treatment system shown in an embodiment of the present application;

[0030] Figure 3 It is a schematic diagram of the structure of an electronic device shown in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0032] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "a", "an" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0033] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0034] In the related art, since the exhaust gas generated by diesel combustion contains a variety of toxic and harmful substances, the exhaust gas needs to be post-processed after the diesel combustion generates exhaust gas. The substances sprayed by the front-stage SCR are too much, which makes it difficult to reduce the NO in the exhaust gas. X When the concentration is too high, the regeneration ability of DPF will be weakened, and it will not be able to deal with N2O in the exhaust gas well. When the substance sprayed by the front-stage SCR is too little, it will reduce the NO in the exhaust gas. X The concentration of NO is still at a high concentration, making it impossible for the subsequent SCR to handle excessive NO X , will result in the exhaust gas not being treated cleanly. Therefore, there is an urgent need for a treatment method that can change the amount of substances sprayed by the SCR so that the exhaust gas meets the emission standards.

[0035] In view of the above problems, the present invention provides a method for treating a two-stage SCR post-treatment system, which can make the SCR have a high NO X While maintaining the conversion efficiency, the passive regeneration function of DPF can be basically unaffected, reducing the concentration of N2O in the exhaust gas and making the exhaust emissions meet the standards.

[0036] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0037] Figure 1 It is a flow chart of a treatment method of a dual-stage SCR post-treatment system shown in an embodiment of the present application.

[0038] See also Figure 1 , a treatment method for a dual-stage SCR post-treatment system, comprising:

[0039] S110: Acquire a first temperature of a front-stage reaction module and a second temperature of a rear-stage reaction module.

[0040] Specifically, currently, diesel engines usually use a two-stage SCR (Selective Catalytic Reduction) post-treatment technology to treat exhaust gas. The two-stage SCR technology is usually arranged as preSCR (pre-stage SCR) + DOC (Diesel Oxidation Catalyst) + DPF (Diesel Particulate Filter) + subSCR (post-stage SCR). The exhaust of the diesel engine first passes through the selective catalytic reducer, which can be arranged at the outlet of the supercharger of the diesel engine to facilitate rapid increase of the carrier temperature, and can inject urea earlier to reduce nitrogen oxide emissions at low temperatures. The selective catalytic reducer includes a mixer, a urea nozzle and a temperature sensor. The temperature sensor is responsible for collecting the exhaust temperature signal at the front end of the selective catalytic reducer and transmitting the signal to the controller through the wiring harness. The urea nozzle injects urea according to the injection command of the controller, and the mixer fully atomizes the injected urea and evenly distributes it on the surface of the carrier. After the exhaust gas is mixed with urea by the selective catalytic reducer, it passes through the diesel oxidation catalyst, which generally uses precious metals or ceramics as catalyst carriers. Under the action of the catalyst, CO and HC in the exhaust gas are oxidized and converted into non-toxic and harmless CO2 and H2O, and NO is converted into NO2. At the same time, the diesel oxidation catalyst can also absorb soluble organic components and some carbon particles to reduce the emission of some PM. NO is oxidized into NO2. After the exhaust gas passes through the diesel oxidation catalyst, it enters the diesel particulate filter, and the particles in the exhaust gas are captured, and then mixed with urea again through the selective catalytic converter to reduce nitrogen oxide emissions, and finally discharged into the atmosphere to achieve post-treatment of the exhaust gas.

[0041] Diesel particulate filter regeneration includes active regeneration and passive regeneration. Active regeneration refers to injecting fuel into the exhaust pipe, oxidizing and releasing heat on the diesel oxidation catalyst to increase the exhaust temperature before the DPF to above 550°C. At this time, the soot particles captured by the diesel particulate filter will react quickly with the oxygen in the diesel engine exhaust, thereby achieving the purpose of quickly eliminating the soot particles in the diesel particulate filter. Passive regeneration refers to the reaction of the soot particles captured in the diesel particulate filter with the NO2 in the diesel engine exhaust at a certain temperature to generate CO2 and NO, thereby achieving the purpose of eliminating the soot particles captured in the diesel particulate filter.

[0042] Specifically, the front-stage reaction module may be a front-stage SCR, and the rear-stage reaction module may be a rear-stage SCR, both of which include a mixer, a urea nozzle, and a temperature sensor. The first temperature may be an airflow temperature near the front end face of the front-stage reaction module, or a carrier temperature, or a temperature near the rear end face of the module; the second temperature may be an airflow temperature near the front end face of the rear-stage reaction module, or a carrier temperature, or a temperature near the rear end face of the module.

[0043] S120: Determine an operating mode of the dual-stage SCR after-treatment system according to the first temperature and the second temperature.

[0044] Specifically, after obtaining the first temperature of the front-stage reaction module and the second temperature of the rear-stage reaction module, the working mode of the two-stage SCR after-treatment system can be controlled according to different temperature ranges. When the first temperature of the front-stage reaction module is too high or too low, the working mode of the two-stage SCR after-treatment system can be adjusted, and the first temperature of the front-stage reaction module can be adjusted to change the working mode of the two-stage SCR after-treatment system. When the second temperature of the rear-stage reaction module is too high or too low, the second temperature of the rear-stage reaction module can also be adjusted to change the working mode of the two-stage SCR after-treatment system, so as to achieve the best working state of CSR and DPF, which is beneficial to improving the exhaust gas treatment efficiency.

[0045] In one possible implementation, when the first temperature is less than or equal to the first preset temperature, the two-stage SCR after-treatment system is determined to be in an inert mode; when the first temperature is greater than the first preset temperature and the second temperature is less than or equal to the first preset temperature, the two-stage SCR after-treatment system is determined to be in a low-temperature mode; when the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the second preset temperature, the two-stage SCR after-treatment system is determined to be in a medium-temperature mode; when the second temperature is greater than the second preset temperature, the two-stage SCR after-treatment system is determined to be in a high-temperature mode.

[0046] Specifically, the working mode of the two-stage SCR after-treatment system can be controlled according to the first temperature of the front-stage reaction module and the second temperature of the rear-stage reaction module. The first preset temperature can be set as the urea start-up temperature. For example, the first preset temperature is 180±10°C. The urea start-up temperature can reduce the negative impact of urea crystallization on the after-treatment system and improve the reaction efficiency of urea. When the first temperature is less than or equal to the first preset temperature, the two-stage SCR after-treatment system can be controlled to be in an inert mode. When the two-stage SCR after-treatment system is in an inert mode, urea is at the lowest reaction efficiency. When the first temperature of the front-stage reaction module is less than the first preset temperature and the second temperature of the rear-stage reaction module is less than the first preset temperature, the two-stage SCR after-treatment system can be controlled to be in a low-temperature mode. At this time, the temperature of urea injection is higher than the temperature of injection in the inert mode. The reaction efficiency of urea injected in the low-temperature mode is higher. The reaction efficiency of urea injected in the inert mode is higher; the second preset temperature can be set to 460±10°C, at which time the urea injection temperature is relatively high, and the reaction temperature of the SCR is also relatively high. When the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the second temperature, the two-stage SCR after-treatment system can be controlled to be in the medium-temperature mode, which is the optimal temperature for urea injection and the passive regeneration efficiency of the SCR is better; when the second temperature is greater than the second preset temperature, the two-stage SCR after-treatment system enters the high-temperature mode, at which time the temperature of the entire system is too high, the urea injection temperature is too high, and at the same time the reaction temperature of the SCR is too high, which will reduce the passive regeneration efficiency of the SCR and reduce the performance of the SCR.

[0047] In one possible implementation, when the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the third preset temperature, the two-stage SCR after-treatment system is determined to be in a low activity mode; when the second temperature is greater than the third preset temperature and the second temperature is less than or equal to the fourth preset temperature, the two-stage SCR after-treatment system is determined to be in a medium activity mode; when the second temperature is greater than the fourth preset temperature and the second temperature is less than or equal to the second preset temperature, the two-stage SCR after-treatment system is determined to be in an optimal activity mode.

[0048] Specifically, the third preset temperature may be 240±10° C., which is the lowest temperature at which the SCR has better performance. When the SCR is at the third preset temperature, it may have better processing efficiency. When the temperature is higher than the third preset temperature, the SCR nitrogen oxygen conversion rate approaches or exceeds 99%. The third preset temperature is the minimum temperature at which the passive regeneration of the DPF works effectively. When the second temperature of the rear-stage reaction module is greater than the first preset temperature and less than or equal to the third preset temperature, the two-stage SCR after-treatment system is in a low-activity mode. At this time, the performance of the SCR is better, and the passive regeneration efficiency of the DPF is also in a better state; the fourth preset temperature can be 280±10°C. The fourth preset temperature is the minimum temperature at which the passive regeneration of the DPF works efficiently. When the second temperature of the rear-stage reaction module is greater than the third preset temperature and less than or equal to the fourth preset temperature, the two-stage SCR after-treatment system is in a semi-active state. At this time, the two-stage SCR after-treatment system is between the third preset temperature and the fourth preset temperature, the urea injection amount of the SCR is higher, the reaction efficiency is better, and the passive regeneration efficiency of the DPF is also in a better state; when the second temperature of the rear-stage reaction module is greater than the fourth preset temperature and less than or equal to the second preset temperature, the two-stage SCR after-treatment system is in an optimal activity mode, and the reaction efficiencies of the SCR and DPF are both in the best state.

[0049] Specifically, the passive regeneration of the diesel particulate filter occurs very slowly below 240°C, the passive regeneration rate is substantially the same as the rate at which the diesel particulate filter captures soot at around 280-300°C, and the passive regeneration rate is generally higher than the rate at which the diesel particulate filter captures soot at above 300°C. Therefore, the third preset temperature is set to 240±10°C, and the fourth preset temperature is set to 280±10°C, so that both the selective catalytic reduction device and the diesel particulate filter are in good working condition.

[0050] In one possible implementation, the temperature of the DPF may be monitored instead of monitoring the temperature of the front-stage reaction module, and the operating mode of the two-stage SCR after-treatment system may be controlled by the temperature of the DPF; when the temperature of the DPF is less than or equal to the first preset temperature, the two-stage SCR after-treatment system is determined to be in an inert mode; when the temperature of the DPF is greater than the first preset temperature, and the temperature of the DPF is less than or equal to the first preset temperature, the two-stage SCR after-treatment system is determined to be in a low-temperature mode; when the temperature of the DPF is greater than the first preset temperature, and the temperature of the DPF is less than or equal to the second preset temperature, the two-stage SCR after-treatment system is determined to be in a medium-temperature mode; when the temperature of the DPF is greater than the second preset temperature, the two-stage SCR after-treatment system is determined to be in a high-temperature mode.

[0051] S130: Acquire the concentration of a first compound input to a front-stage reaction module, the concentration of a second compound output from the front-stage reaction module, and the concentration of a third compound output from a rear-stage reaction module, wherein the first compound, the second compound, and the third compound all include at least nitrogen oxides.

[0052] Specifically, the concentration of the first compound may be the concentration of nitrogen oxides input to the front-stage reaction module, the concentration of the second compound may be the concentration of nitrogen oxides output by the front-stage reaction module, and the concentration of the third compound may be the concentration of nitrogen oxides output by the rear-stage reaction module. By monitoring the concentrations of the first compound, the second compound, and the third compound, the exhaust gas treatment effect can be monitored, and the working mode of the entire two-stage SCR after-treatment system can be adjusted according to multiple concentrations so that the exhaust gas output can meet the standard.

[0053] S140: Determine the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module according to the concentration of the first compound, the concentration of the second compound, the concentration of the third compound and the working mode of the two-stage SCR post-treatment system, wherein both the first medium and the second medium include at least urea.

[0054] Specifically, the first medium output may be the amount of urea injected by the urea nozzle of the front-stage reaction module, and the second medium output may be the amount of urea injected by the urea nozzle of the rear-stage reaction module. By changing the first medium output and the second output through different working modes of the two-stage SCR after-treatment system, the exhaust gas treatment effect can be improved.

[0055] In one possible implementation, a first distribution coefficient of a front-stage reaction module is calculated based on the concentration of the first compound and the concentration of the second compound, and the first distribution coefficient is negatively correlated with the concentration of the second compound; a second distribution coefficient of a rear-stage reaction module is calculated based on the concentration of the first compound, the concentration of the second compound, and the concentration of the third compound, and the second distribution coefficient is positively correlated with the concentration of the second compound; and a first medium output of the front-stage reaction module and a second medium output of the rear-stage reaction module are determined based on the first distribution coefficient, the second distribution coefficient, and the operating mode of the two-stage SCR after-treatment system.

[0056] Specifically, according to the first distribution coefficient and the second distribution coefficient, the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module are adjusted, specifically, the urea injection amount of the front-stage reaction module and the urea injection amount of the rear-stage reaction module can be adjusted to achieve the optimal exhaust gas treatment effect.

[0057] In one possible implementation, when the first distribution coefficient is 0, the second distribution coefficient is 0, and the operating mode of the two-stage SCR after-treatment system is the inert mode, the first medium output of the front-stage reaction module is determined to be 0, and the second medium output of the rear-stage reaction module is 0; when the first distribution coefficient is 1, the second distribution coefficient is 0, and the operating mode of the two-stage SCR after-treatment system is the low-temperature mode, the first medium output of the front-stage reaction module is determined to be the maximum output, and the second medium output of the rear-stage reaction module is 0; when the first distribution coefficient is 1, the second distribution coefficient is 0, and the operating mode of the two-stage SCR after-treatment system is the high-temperature mode, the first medium output of the front-stage reaction module is determined to be the maximum output, and the second medium output of the rear-stage reaction module is 0.

[0058] In one possible implementation, when the first distribution coefficient is in the first interval, the second distribution coefficient is in the second interval, and the operating mode of the two-stage SCR after-treatment system is the low activity mode, the first medium output of the front-stage reaction module is determined to be the first output, and the second medium output of the rear-stage reaction module is determined to be the second output; when the first distribution coefficient is in the third interval, the second distribution coefficient is in the fourth interval, and the operating mode of the two-stage SCR after-treatment system is the medium activity mode, the first medium output of the front-stage reaction module is determined to be the third output, and the second medium output of the rear-stage reaction module is the fourth output, wherein the sum of the first distribution coefficient and the second distribution coefficient is 1; when the first distribution coefficient is 0, the second distribution coefficient is 1, and the operating mode of the two-stage SCR after-treatment system is the optimal activity mode, the first medium output of the front-stage reaction module is determined to be 0, and the second medium output of the rear-stage reaction module is 1.

[0059] Specifically, the first interval can be 0.7±0.2, the second interval can be 0.3±0.2, the sum of the values ​​of the first interval and the second interval is 1, for example, the first distribution coefficient is 0.7, the second distribution coefficient is 0.3, the total medium output of the two-stage SCR post-treatment system can be set, the first medium output of the front-stage reaction module accounts for 0.7 of the total medium output, and the second medium output of the rear-stage reaction module accounts for 0.3 of the total medium output. At this time, the working mode of the two-stage SCR post-treatment system is a low-activity mode, and the reaction temperature is more suitable; the third interval can be 0.4±0.1, the fourth interval can be 0.6±0.1, the third interval and the fourth The sum of the values ​​of the interval is 1, the first medium output of the front-stage reaction module accounts for 0.4 of the total medium output, and the second medium output of the rear-stage reaction module accounts for 0.6 of the total medium output. At this time, the working mode of the two-stage SCR after-treatment system is the medium activity mode; when the working mode of the two-stage SCR after-treatment system is the optimal activity mode, the reaction temperature is optimal, the first distribution coefficient is 0, the second distribution coefficient is 1, the first medium output of the front-stage reaction module is 0, and the second medium output of the rear-stage reaction module accounts for all of the total medium output. By adjusting the medium output of the front-stage reaction module and the rear-stage reaction module, the SCR can be made to have a higher NO X While maintaining the conversion efficiency, the passive regeneration function of DPF can be basically unaffected, reducing the concentration of N2O in the exhaust gas and making the exhaust emissions meet the standards.

[0060] In one possible implementation, the difference between the concentration of the first compound and the concentration of the second compound is calculated to obtain a first difference; the quotient between the first difference and the concentration of the first compound is used as a first distribution coefficient; and the second distribution coefficient of the subsequent reaction module is calculated based on the concentration of the first compound, the concentration of the second compound, and the concentration of the third compound, including: calculating the difference between the concentration of the second compound and the concentration of the third compound to obtain a second difference; and the quotient between the second difference and the concentration of the first compound is used as a second distribution coefficient.

[0061] Specifically, the calculation formula for the first distribution coefficient can be: the difference between the concentration of the first compound and the concentration of the second compound is divided by the concentration of the first compound to obtain the first distribution coefficient; the calculation formula for the second distribution coefficient can be: the difference between the concentration of the second compound and the concentration of the third compound is divided by the concentration of the first compound to obtain the second distribution coefficient, and the second distribution coefficient can also be (1-first distribution coefficient).

[0062] In a possible implementation, the first distribution coefficient may be calculated as: (the difference between the concentration of the first compound and the concentration of the second compound) / (the difference between the concentration of the first compound and the concentration of the third compound), and the second distribution coefficient may be calculated as: (the difference between the concentration of the second compound and the concentration of the third compound) / (the difference between the concentration of the first compound and the concentration of the third compound).

[0063] The processing method of the dual-stage SCR post-treatment system of the present application includes an application to the dual-stage SCR post-treatment system, the dual-stage SCR post-treatment system includes a front-stage reaction module and a rear-stage reaction module, and the processing method includes: obtaining a first temperature of the front-stage reaction module and a second temperature of the rear-stage reaction module; determining the working mode of the dual-stage SCR post-treatment system according to the first temperature and the second temperature; obtaining the concentration of a first compound input to the front-stage reaction module, the concentration of a second compound output from the front-stage reaction module, and the concentration of a third compound output from the rear-stage reaction module, wherein the first compound, the second compound, and the third compound all include at least nitrogen oxides; determining the output amount of a first medium of the front-stage reaction module and the output amount of a second medium of the rear-stage reaction module according to the concentration of the first compound, the concentration of the second compound, the concentration of the third compound, and the working mode of the dual-stage SCR post-treatment system, wherein the first medium and the second medium all include at least urea, so that the SCR can be operated in a state with a relatively high NO X While maintaining the conversion efficiency, the passive regeneration function of DPF can be basically unaffected, reducing the concentration of N2O in the exhaust gas and making the exhaust emissions meet the standards.

[0064] Corresponding to the aforementioned application function realization method embodiment, the present application also provides a processing device, an electronic device and corresponding embodiments of a dual-stage SCR post-treatment system.

[0065] Figure 2 Schematic diagram of the structure of the processing device of the dual-stage SCR post-treatment system shown in the embodiment of the present application.

[0066] See also Figure 2 A processing device 200 of a dual-stage SCR post-treatment system includes a first acquisition module 210, a first processing module 220, a second acquisition module 230 and a second processing module 240.

[0067] The first acquisition module 210 is used to acquire a first temperature of a front-stage reaction module and a second temperature of a rear-stage reaction module.

[0068] Specifically, the front-stage reaction module may be a front-stage SCR, and the rear-stage reaction module may be a rear-stage SCR, both of which include a mixer, a urea nozzle, and a temperature sensor. The first temperature may be an airflow temperature near the front end face of the front-stage reaction module, or a carrier temperature, or a temperature near the rear end face of the module; the second temperature may be an airflow temperature near the front end face of the rear-stage reaction module, or a carrier temperature, or a temperature near the rear end face of the module.

[0069] The first processing module 220 is configured to determine an operating mode of the dual-stage SCR after-treatment system according to the first temperature and the second temperature.

[0070] Specifically, after obtaining the first temperature of the front-stage reaction module and the second temperature of the rear-stage reaction module, the working mode of the two-stage SCR after-treatment system can be controlled according to different temperature ranges. When the first temperature of the front-stage reaction module is too high or too low, the working mode of the two-stage SCR after-treatment system can be adjusted, and the first temperature of the front-stage reaction module can be adjusted to change the working mode of the two-stage SCR after-treatment system. When the second temperature of the rear-stage reaction module is too high or too low, the second temperature of the rear-stage reaction module can also be adjusted to change the working mode of the two-stage SCR after-treatment system, so as to achieve the best working state of CSR and DPF, which is beneficial to improving the exhaust gas treatment efficiency.

[0071] In one possible embodiment, the first processing module 220 also includes when the first temperature is less than or equal to the first preset temperature, determining that the two-stage SCR after-treatment system is in an inert mode; when the first temperature is greater than the first preset temperature and the second temperature is less than or equal to the first preset temperature, determining that the two-stage SCR after-treatment system is in a low-temperature mode; when the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the second preset temperature, determining that the two-stage SCR after-treatment system is in a medium-temperature mode; when the second temperature is greater than the second preset temperature, determining that the two-stage SCR after-treatment system is in a high-temperature mode.

[0072] In a possible embodiment, the first processing module 220 also includes a medium temperature mode including a low activity mode, a medium activity mode and an optimal activity mode. When the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the third preset temperature, the two-stage SCR after-treatment system is determined to be in the low activity mode; when the second temperature is greater than the third preset temperature and the second temperature is less than or equal to the fourth preset temperature, the two-stage SCR after-treatment system is determined to be in the medium activity mode; when the second temperature is greater than the fourth preset temperature and the second temperature is less than or equal to the second preset temperature, the two-stage SCR after-treatment system is determined to be in the optimal activity mode.

[0073] The second acquisition module 230 is used to obtain the concentration of the first compound input to the front-stage reaction module, the concentration of the second compound output from the front-stage reaction module, and the concentration of the third compound output from the back-stage reaction module. The first compound, the second compound, and the third compound all include at least nitrogen oxides.

[0074] Specifically, the concentration of the first compound may be the concentration of nitrogen oxides input to the front-stage reaction module, the concentration of the second compound may be the concentration of nitrogen oxides output by the front-stage reaction module, and the concentration of the third compound may be the concentration of nitrogen oxides output by the rear-stage reaction module. By monitoring the concentrations of the first compound, the second compound, and the third compound, the exhaust gas treatment effect can be monitored, and the working mode of the entire two-stage SCR after-treatment system can be adjusted according to multiple concentrations so that the exhaust gas output can meet the standard.

[0075] The second processing module 240 is used to determine the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module according to the concentration of the first compound, the concentration of the second compound, the concentration of the third compound and the working mode of the two-stage SCR post-treatment system, and the first medium and the second medium both include at least urea.

[0076] Specifically, the first medium output may be the amount of urea injected by the urea nozzle of the front-stage reaction module, and the second medium output may be the amount of urea injected by the urea nozzle of the rear-stage reaction module. By changing the first medium output and the second output through different working modes of the two-stage SCR after-treatment system, the exhaust gas treatment effect can be improved.

[0077] In a possible embodiment, the second processing module 240 also includes calculating a first distribution coefficient of the front-stage reaction module based on the concentration of the first compound and the concentration of the second compound, and the first distribution coefficient is negatively correlated with the concentration of the second compound; calculating a second distribution coefficient of the rear-stage reaction module based on the concentration of the first compound, the concentration of the second compound and the concentration of the third compound, and the second distribution coefficient is positively correlated with the concentration of the second compound; and determining the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module based on the first distribution coefficient, the second distribution coefficient and the working mode of the two-stage SCR after-treatment system.

[0078] In one possible embodiment, the second processing module 240 also includes when the first distribution coefficient is 0, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is the inert mode, determining that the first medium output of the front-stage reaction module is 0, and the second medium output of the rear-stage reaction module is 0; when the first distribution coefficient is 1, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is the low-temperature mode, determining that the first medium output of the front-stage reaction module is the maximum output, and the second medium output of the rear-stage reaction module is 0; when the first distribution coefficient is 1, the second distribution coefficient is 0, and the working mode of the two-stage SCR after-treatment system is the high-temperature mode, determining that the first medium output of the front-stage reaction module is the maximum output, and the second medium output of the rear-stage reaction module is 0.

[0079] In one possible embodiment, the second processing module 240 also includes when the first distribution coefficient is in the first interval, the second distribution coefficient is in the second interval, and the working mode of the two-stage SCR after-treatment system is the low activity mode, determining the first medium output of the front-stage reaction module to be the first output, and the second medium output of the rear-stage reaction module to be the second output; when the first distribution coefficient is in the third interval, the second distribution coefficient is in the fourth interval, and the working mode of the two-stage SCR after-treatment system is the medium activity mode, determining the first medium output of the front-stage reaction module to be the third output, and the second medium output of the rear-stage reaction module to be the fourth output, wherein the sum of the first distribution coefficient and the second distribution coefficient is 1; when the first distribution coefficient is 0, the second distribution coefficient is 1, and the working mode of the two-stage SCR after-treatment system is the optimal activity mode, determining the first medium output of the front-stage reaction module to be 0, and the second medium output of the rear-stage reaction module to be 1.

[0080] In a possible embodiment, the second processing module 240 also includes calculating the difference between the concentration of the first compound and the concentration of the second compound to obtain a first difference; using the quotient between the first difference and the concentration of the first compound as the first distribution coefficient; calculating the difference between the concentration of the second compound and the concentration of the third compound to obtain a second difference; using the quotient between the second difference and the concentration of the first compound as the first distribution coefficient.

[0081] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated again here.

[0082] Figure 3 It is a schematic diagram of the structure of an electronic device shown in an embodiment of the present application.

[0083] See also Figure 3 , the electronic device 300 includes a memory 310 and a processor 320.

[0084] The processor 320 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0085] The memory 310 may include various types of storage units, such as system memory, read-only memory (ROM), and permanent storage devices. Among them, ROM can store static data or instructions required by the processor 320 or other modules of the computer. The permanent storage device may be a readable and writable storage device. The permanent storage device may be a non-volatile storage device that does not lose the stored instructions and data even after the computer is powered off. In some embodiments, the permanent storage device uses a large-capacity storage device (such as a magnetic or optical disk, flash memory) as a permanent storage device. In some other embodiments, the permanent storage device may be a removable storage device (such as a floppy disk, optical drive). The system memory may be a readable and writable storage device or a volatile readable and writable storage device, such as a dynamic random access memory. The system memory may store some or all instructions and data required by the processor at run time. In addition, the memory 310 may include any combination of computer-readable storage media, including various types of semiconductor storage chips (such as DRAM, SRAM, SDRAM, flash memory, programmable read-only memory), and disks and / or optical disks may also be used. In some embodiments, the memory 310 may include a readable and / or writable removable storage device, such as a laser disc (CD), a read-only digital versatile disc (such as a DVD-ROM, a double-layer DVD-ROM), a read-only Blu-ray disc, an ultra-density optical disc, a flash memory card (such as an SD card, a mini SD card, a Micro-SD card, etc.), a magnetic floppy disk, etc. Computer-readable storage media do not include carrier waves and transient electronic signals transmitted wirelessly or wired.

[0086] The memory 310 stores executable codes, and when the executable codes are processed by the processor 320 , the processor 320 can execute part or all of the methods described above.

[0087] In addition, the method according to the present application may also be implemented as a computer program or a computer program product, which includes computer program code instructions for executing some or all of the steps in the above method of the present application.

[0088] Alternatively, the present application can also be implemented as a computer-readable storage medium (or non-transitory machine-readable storage medium or machine-readable storage medium) on which executable code (or computer program or computer instruction code) is stored. When the executable code (or computer program or computer instruction code) is executed by a processor of an electronic device (or server, etc.), the processor executes part or all of the steps of the above-mentioned method according to the present application.

[0089] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A treatment method for a dual-stage SCR post-treatment system, characterized in that: Applied to a two-stage SCR post-treatment system, the two-stage SCR post-treatment system includes a front-stage reaction module and a rear-stage reaction module, and the treatment method includes: Acquiring a first temperature of the front-stage reaction module and a second temperature of the rear-stage reaction module; determining an operating mode of the dual-stage SCR after-treatment system according to the first temperature and the second temperature; Acquire the concentration of a first compound input to the front-stage reaction module, the concentration of a second compound output from the front-stage reaction module, and the concentration of a third compound output from the back-stage reaction module, wherein the first compound, the second compound, and the third compound all include at least nitrogen oxides; According to the concentration of the first compound, the concentration of the second compound, the concentration of the third compound and the working mode of the two-stage SCR after-treatment system, the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module are determined, and the first medium and the second medium both include at least urea.

2. The method according to claim 1, characterized in that The determining the operating mode of the dual-stage SCR after-treatment system according to the first temperature and the second temperature includes: When the first temperature is less than or equal to a first preset temperature, determining that the dual-stage SCR after-treatment system is in an inert mode; When the first temperature is greater than the first preset temperature, and the second temperature is less than or equal to the first preset temperature, determining that the dual-stage SCR after-treatment system is in a low temperature mode; When the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the second preset temperature, determining that the dual-stage SCR post-treatment system is in a medium temperature mode; When the second temperature is greater than the second preset temperature, it is determined that the dual-stage SCR after-treatment system is in a high temperature mode.

3. The method according to claim 2, characterized in that The medium temperature mode includes a low activity mode, a medium activity mode and an optimal activity mode, and when the second temperature is greater than the first preset temperature and the second temperature is less than or equal to the second preset temperature, determining that the two-stage SCR post-treatment system is in the medium temperature mode includes: When the second temperature is greater than the first preset temperature and the second temperature is less than or equal to a third preset temperature, determining that the dual-stage SCR after-treatment system is in a low activity mode; When the second temperature is greater than the third preset temperature and the second temperature is less than or equal to a fourth preset temperature, determining that the dual-stage SCR after-treatment system is in a medium activity mode; When the second temperature is greater than the fourth preset temperature and the second temperature is less than or equal to the second preset temperature, it is determined that the dual-stage SCR after-treatment system is in the optimal activity mode.

4. The method according to claim 3, characterized in that The method of determining the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module according to the first compound concentration, the second compound concentration, the third compound concentration and the working mode of the two-stage SCR post-treatment system includes: Calculating a first distribution coefficient of the front-stage reaction module according to the concentration of the first compound and the concentration of the second compound, wherein the first distribution coefficient is negatively correlated with the concentration of the second compound; Calculating a second distribution coefficient of the subsequent reaction module according to the concentration of the first compound, the concentration of the second compound, and the concentration of the third compound, wherein the second distribution coefficient is positively correlated with the concentration of the second compound; The first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module are determined according to the first distribution coefficient, the second distribution coefficient and the working mode of the dual-stage SCR post-treatment system.

5. The method according to claim 4, characterized in that The determining, according to the first distribution coefficient, the second distribution coefficient and the working mode of the dual-stage SCR post-treatment system, the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module comprises: When the first distribution coefficient is 0, the second distribution coefficient is 0, and the working mode of the dual-stage SCR post-treatment system is an inert mode, the first medium output of the front-stage reaction module is determined to be 0, and the second medium output of the rear-stage reaction module is determined to be 0; When the first distribution coefficient is 1, the second distribution coefficient is 0, and the working mode of the dual-stage SCR post-treatment system is a low-temperature mode, the first medium output of the front-stage reaction module is determined to be the maximum output, and the second medium output of the rear-stage reaction module is 0; When the first distribution coefficient is 1, the second distribution coefficient is 0, and the operating mode of the dual-stage SCR post-treatment system is the high temperature mode, the first medium output of the front-stage reaction module is determined to be the maximum output, and the second medium output of the rear-stage reaction module is 0.

6. The method according to claim 4, characterized in that The determining, according to the first distribution coefficient, the second distribution coefficient and the working mode of the dual-stage SCR post-treatment system, the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module comprises: When the first distribution coefficient is in the first interval, the second distribution coefficient is in the second interval, and the working mode of the dual-stage SCR post-treatment system is the low-activity mode, the first medium output of the front-stage reaction module is determined to be the first output, and the second medium output of the rear-stage reaction module is determined to be the second output; When the first distribution coefficient is in the third interval, the second distribution coefficient is in the fourth interval, and the working mode of the dual-stage SCR post-treatment system is the medium activity mode, the first medium output of the front-stage reaction module is determined to be the third output, and the second medium output of the rear-stage reaction module is determined to be the fourth output, wherein the sum of the first distribution coefficient and the second distribution coefficient is 1; When the first distribution coefficient is 0, the second distribution coefficient is 1, and the working mode of the dual-stage SCR post-treatment system is the optimal activity mode, the first medium output of the front-stage reaction module is determined to be 0, and the second medium output of the rear-stage reaction module is determined to be 1.

7. The method according to claim 4, characterized in that The calculating the first distribution coefficient of the front-stage reaction module according to the first compound concentration and the second compound concentration includes: calculating a difference between the concentration of the first compound and the concentration of the second compound to obtain a first difference; taking a quotient between the first difference and the concentration of the first compound as the first partition coefficient; The calculating the second distribution coefficient of the subsequent reaction module according to the concentration of the first compound, the concentration of the second compound and the concentration of the third compound comprises: calculating a difference between the concentration of the second compound and the concentration of the third compound to obtain a second difference; The quotient between the second difference and the first compound concentration is taken as the second partition coefficient.

8. A treatment device for a dual-stage SCR post-treatment system, comprising: A first acquisition module, used to acquire a first temperature of a front-stage reaction module and a second temperature of a rear-stage reaction module; a first processing module, configured to determine an operating mode of the dual-stage SCR post-treatment system according to the first temperature and the second temperature; A second acquisition module is used to acquire the concentration of a first compound input to the front-stage reaction module, the concentration of a second compound output from the front-stage reaction module, and the concentration of a third compound output from the back-stage reaction module, wherein the first compound, the second compound, and the third compound all include at least nitrogen oxides; The second processing module is used to determine the first medium output of the front-stage reaction module and the second medium output of the rear-stage reaction module according to the concentration of the first compound, the concentration of the second compound, the concentration of the third compound and the working mode of the two-stage SCR after-treatment system, and the first medium and the second medium both include at least urea.

9. An electronic device, characterized in that: include: processor; as well as A memory having executable codes stored thereon, which, when executed by the processor, causes the processor to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: An executable code is stored thereon, and when the executable code is executed by a processor of an electronic device, the processor is caused to execute the method as claimed in any one of claims 1 to 7.

Images