CN202250321U - Temperature forecasting device of SCR (silicon-controlled rectifier) catalytic converter - Google Patents

Temperature forecasting device of SCR (silicon-controlled rectifier) catalytic converter Download PDF

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Publication number
CN202250321U
CN202250321U CN201120178535XU CN201120178535U CN202250321U CN 202250321 U CN202250321 U CN 202250321U CN 201120178535X U CN201120178535X U CN 201120178535XU CN 201120178535 U CN201120178535 U CN 201120178535U CN 202250321 U CN202250321 U CN 202250321U
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scr catalyst
catalyst converter
temperature
scr
infinitesimals
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孙少军
佟德辉
刘颖帅
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/40—Engine management systems

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Abstract

The utility model provides a temperature forecasting device of an SCR (silicon-controlled rectifier) catalytic converter and a temperature forecasting method for the SCR catalytic converter. The temperature forecasting device comprises a plurality of micro elements of the SCR catalytic converter, a plurality of devices for calculating the temperature of the micro elements according to the actual temperature and physical parameters of the SCR catalytic converter and the engine exhaust flow, and a plurality of devices for calculating the temperature of the SCR catalytic converter according to the calculated temperature of the micro elements.

Description

A kind of temperature prediction device of SCR catalyst converter
Technical field
The utility model relates to a kind of temperature prediction device of SCR catalyst converter.
Background technique
For using the SCR post-processing technology to satisfy the diesel engine of state IV, state V discharging, in steady state condition, the formulation of control strategy all is based on MAP figure, promptly realizes based on empirical value and interpolation algorithm.The control strategy of existing SCR open loop at present or closed loop can satisfy the demand for control of motor under the stable operation condition basically; Promptly can calculate urea-spray amount according to the NOx discharge amount of motor under the stable operation condition and the conversion ratio of SCR catalyst converter to the SCR catalyst converter.
But when motor when an operating mode carries out the transition to another operating mode, promptly under the situation of instantaneous conditions, the temperature of SCR catalyst converter can not reach the temperature when stablizing with the variation of rotating speed and moment of torsion rapidly.When motor carries out the transition to the warm operating mode of high row from the warm operating mode of low row moment; The SCR SC system controller according to moment detected engine speed and moment of torsion send the corresponding urea flow instruction of the warm operating mode of high row; And this moment; The temperature of catalyst converter does not also have enough time to reach the temperature when stablizing, and the aqueous solution of urea that sprays into can generate ammonia salt and cover catalyst surface under the warm environment of low row.Along with the progressively rising of catalyst temperature, the ammonia of the inner absorption of catalyzer can be overflowed in a large number, and ammonia salt pyrolytic reaction also takes place discharges ammonia, and this moment, the amount of ammonia tended to exceed the theory demands amount, discharges with ammonia in the catalyst converter outlet, pollutes.Otherwise, arrange warm operating mode moment when carrying out the transition to the warm operating mode of low row when motor from height, the NOx discharging will exceed standard, and pollutes equally.
Therefore; Need a kind of particularly accurate temperature of prediction SCR catalyst converter under the situation of the instantaneous conditions of motor; Thereby obtain the conversion ratio of SCR catalyst converter in time, so that correctly calculate device, system and method to the urea-spray amount of SCR catalyst converter.
The model utility content
The purpose of the utility model is the problems referred to above of present SCR control system are improved, and promptly passes through the temperature of prediction SCR catalyst converter, thus the conversion ratio of the SCR catalyst converter of prediction under engine steady state and instantaneous conditions.Like this when engine operating condition changes; Can accurately predict the temperature of SCR catalyst converter and obtain the NOx conversion ratio of SCR catalyst converter; The conversion ratio under the situation of instantaneous conditions particularly, thus under the various operating modes of calculation engine accurately to the urea-spray amount of SCR catalyst converter.
According to an aspect of the utility model, a kind of temperature prediction device of SCR catalyst converter is provided, comprising: a plurality of infinitesimals of SCR catalyst converter; The infinitesimal temperature computing device; Be connected to each infinitesimal of said SCR catalyst converter, be used for true temperature, physical parameter and engine exhaust flow, calculate the temperature of a plurality of infinitesimals according to the SCR catalyst converter; And SCR catalyst temperature computing device; Be connected to a plurality of infinitesimals of said SCR catalyst converter, be used for temperature, calculate the temperature of SCR catalyst converter according to a plurality of infinitesimals that calculate.
According to the embodiment's of the utility model device, wherein the SCR catalyst converter comprises 2-10 infinitesimal.
According to the embodiment's of the utility model device, wherein the SCR catalyst converter comprises 5-6 infinitesimal.
According to the embodiment's of the utility model device, wherein the annexation between a plurality of infinitesimals in the SCR catalyst converter is to be connected in series or to be connected in parallel or connection that series parallel connection combines.
According to the embodiment's of the utility model device, wherein a plurality of infinitesimals in the SCR catalyst converter have configurations differing from one and/or size.
According to the embodiment's of the utility model device, the wherein arithmetic mean value of the temperature of SCR catalyst temperature computing device through calculating each infinitesimal or the temperature that weighted mean value calculates the SCR catalyst converter.
Another aspect according to the utility model; A kind of method of temperature prediction of SCR catalyst converter is provided; Comprise: the SCR catalyst converter is divided into a plurality of infinitesimals, and, calculates the temperature of a plurality of infinitesimals according to true temperature, physical parameter and the engine exhaust flow of SCR catalyst converter; And, calculate the temperature of SCR catalyst converter according to the temperature of a plurality of infinitesimals that calculate.
Method according to the embodiment of the utility model wherein is divided into 2-10 infinitesimal with said SCR catalyst converter.
Method according to the embodiment of the utility model wherein is divided into 5-6 infinitesimal with said SCR catalyst converter.
According to the embodiment's of the utility model method, wherein a plurality of infinitesimals in the SCR catalyst converter interconnect with the mode that is connected in series or is connected in parallel or series parallel connection combines.
According to the embodiment's of the utility model method, wherein a plurality of infinitesimals in the said SCR catalyst converter are divided into and have configurations differing from one and/or size.
According to the embodiment's of the utility model method, wherein according to the temperature of a plurality of infinitesimals that calculate, the step of calculating the temperature of SCR catalyst converter comprises through the arithmetic mean value of the temperature of calculating each infinitesimal or the temperature that weighted mean value calculates the SCR catalyst converter.
Description of drawings
With reference to accompanying drawing as an example and the embodiment of the utility model is described, wherein:
Fig. 1 is the skeleton diagram according to the SCR control system of the utility model, comprising SCR control gear and the temperature prediction device according to the utility model.
Fig. 2 is the SCR controlling method flow chart according to the utility model.
Fig. 3 is the SCR catalyst temperature Forecasting Methodology flow chart according to the utility model.
Embodiment
Fig. 1 is the skeleton diagram according to the SCR control system of the utility model.The SCR control system comprises SCR catalyst converter 1; Detection device 2 is used to detect the true temperature of SCR catalyst converter 1; SCR control gear 3, the urea-spray amount that is used to calculate to SCR catalyst converter 1; And urea-spray device 4, be used for regulating urea-spray to SCR catalyst converter 1 according to urea-spray amount to SCR catalyst converter 1 by 3 calculating of SCR control gear.
Referring to Fig. 1, SCR control gear 3 comprises temperature prediction device 31, is used to predict the temperature of SCR catalyst converter; Conversion ratio obtaining device 32 is used for obtaining the conversion ratio of SCR catalyst converter according to the predicted temperature of SCR catalyst converter and the rotating speed and the moment of torsion of motor; And emitted dose computing device 33, be used for according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter, calculate urea-spray amount to the SCR catalyst converter.
As shown in Figure 1, temperature prediction device 31 comprises a plurality of infinitesimals of SCR catalyst converter; Be used for true temperature, physical parameter and engine exhaust flow, calculate the device of the temperature of a plurality of infinitesimals according to the SCR catalyst converter; And be used for temperature according to a plurality of infinitesimals that calculate, calculate the device of the temperature of SCR catalyst converter.
According to an embodiment, temperature prediction device 31 can comprise 2-10 infinitesimal of SCR catalyst converter, promptly can the SCR catalyst converter be divided into 2-10 infinitesimal.Generally speaking, the infinitesimal number of SCR catalyst converter is many more, and is just high more to the order of accuarcy of its temperature prediction.Can know that through experiment under the situation of 2 infinitesimals, corresponding temperature change is slower, be difficult to estimate accurately the quick variation of temperature; Under the situation of 10 infinitesimals, embodied the transient process of temperature preferably, but can produce bigger calculating time-delay, thereby reduced the precision of calculating.Therefore, need reasonably select the infinitesimal quantity of SCR catalyst converter according to the shape and the structure of SCR catalyst converter.Number according to the infinitesimal of experimental result SCR catalyst converter is preferably 5-6.
According to an embodiment, in the infinitesimal quantity of confirming the SCR catalyst converter, should be an infinitesimal with the essentially identical region division of working state in the SCR catalyst converter also according to the shape and the structure of SCR catalyst converter, promptly select the dividing mode of infinitesimal.A plurality of infinitesimals can be connected in series, and promptly the output of first infinitesimal is as the input of second infinitesimal.But for example for the SCR catalyst converter of tubular, a plurality of infinitesimals also can be connections parallel with one another.According to the needs of the shape and the structure of SCR catalyst converter, a plurality of infinitesimals even can interconnect with the mode that series parallel connection combines.This need confirm through experiment according to the concrete condition of SCR catalyst converter.
According to an embodiment, in the infinitesimal quantity and dividing mode of confirming the SCR catalyst converter, also need consider the shape and size of a plurality of SCR catalyst converter infinitesimals.Because the influence of factors such as the shape of SCR catalyst converter and structure; Make it when work; The essentially identical regional extent of working state possibly have nothing in common with each other, and therefore need the SCR catalyst converter be divided into a plurality of infinitesimals that vary in size, and promptly a plurality of infinitesimals can have configurations differing from one and/or size.This need confirm through experiment according to the concrete condition of SCR catalyst converter equally.
According to an embodiment, in temperature prediction device 31 as shown in Figure 1, comprised the temperature that is used for according to a plurality of infinitesimals that calculate, the arithmetic mean value of the temperature through calculating each infinitesimal simply calculates the device of the temperature of SCR catalyst converter.
But, be not difficult to find out that according to above description from the temperature of a plurality of infinitesimals, the predicted temperature that obtains the SCR catalyst converter should be considered quantity, annexation and shape thereof and/or the size of a plurality of infinitesimals.Can be according to the shape and the structure of SCR catalyst converter; Shape and/or size and the position in the SCR catalyst converter thereof according to a plurality of infinitesimals; And on the basis of experiment, correspondingly distribute different separately weights for a plurality of infinitesimals; Temperature to each infinitesimal is carried out weighted mean, to obtain the predicted temperature of SCR catalyst converter.Therefore, according to another embodiment, in temperature prediction device 31 as shown in Figure 1, comprised the temperature that is used for according to a plurality of infinitesimals that calculate, the weighted mean value of the temperature through calculating each infinitesimal calculates the device of the temperature of SCR catalyst converter.
According to an embodiment, can calculate the temperature of a plurality of infinitesimals according to true temperature, physical parameter and the engine exhaust flow of SCR catalyst converter.Formula is following:
dT out dt = a 7 m EG * ( T in - T out ) - a 9 ( t out 4 - T amb 4 )
Wherein:
a 7 = n Cell c p , EG c p , C m C
a 9 = ϵ Rad , SCR σ SB A Rad , SCR c p , C m C
m * EG: exhaust mass flow (kg/s);
T Amb: ambient temperature (k);
T In: infinitesimal inlet temperature (k);
T Out: infinitesimal outlet temperature (k);
n Cell: catalyst converter infinitesimal number;
Wherein following parameter is the physical parameter of SCR catalyst converter, comprising:
ε Rad, SCR=0.507: blackness;
σ SB=5.67e-8: gas radiation constant (W/m 2K 4);
C P, C=1016: catalyst converter specific heat (J/kgK);
m C=30: catalyst converter quality (kg);
C P, EG=1050: exhaust specific heat at constant pressure (J/kgK);
A Rad, SCR=0.9044: catalyst converter radiation surface area (m 2);
For example work as n Cell=2 o'clock, a 7=0.0689 a 9=8.530e-13.
Below referring to figs. 2 and 3.Wherein Fig. 2 is the SCR controlling method flow chart according to the utility model, and Fig. 3 is the SCR catalyst temperature Forecasting Methodology flow chart according to the utility model.
As shown in Figure 2, in step 100, the temperature of prediction SCR catalyst converter; In step 110,, obtain the conversion ratio of SCR catalyst converter according to the predicted temperature of SCR catalyst converter and the rotating speed and the moment of torsion of motor; In step 120,, calculate urea-spray amount to the SCR catalyst converter according to the NOx discharge amount of motor and the conversion ratio of SCR catalyst converter.
As shown in Figure 3, the step of the temperature of prediction SCR catalyst converter comprises following step.In step 200, the SCR catalyst converter is divided into a plurality of infinitesimals; In step 210,, calculate the temperature of a plurality of infinitesimals according to true temperature, physical parameter and the engine exhaust flow of SCR catalyst converter; And,, calculate the temperature of SCR catalyst converter according to the temperature of a plurality of infinitesimals that calculate in step 220.
According to an embodiment, in the SCR controlling method, can the SCR catalyst converter be divided into 2-10 infinitesimal.Can the number of the infinitesimal of SCR catalyst converter preferably be divided into 5-6 according to experimental result.
According to an embodiment, in the infinitesimal quantity of confirming the SCR catalyst converter, should be an infinitesimal with the essentially identical region division of working state in the SCR catalyst converter also according to the shape and the structure of SCR catalyst converter, promptly select the dividing mode of infinitesimal.A plurality of infinitesimals can be connected in series, and promptly the output of first infinitesimal is as the input of second infinitesimal.But for example for the SCR catalyst converter of tubular, a plurality of infinitesimals also can be connections parallel with one another.According to the needs of the shape and the structure of SCR catalyst converter, a plurality of infinitesimals even can interconnect with the mode that series parallel connection combines.This need confirm through experiment according to the concrete condition of SCR catalyst converter.
According to an embodiment, in the infinitesimal quantity and dividing mode of confirming the SCR catalyst converter, also need consider the shape and size of a plurality of SCR catalyst converter infinitesimals.Because the influence of factors such as the shape of SCR catalyst converter and structure; Make it when work; The essentially identical regional extent of working state possibly have nothing in common with each other, and therefore need the SCR catalyst converter be divided into a plurality of infinitesimals that vary in size, and promptly a plurality of infinitesimals can have configurations differing from one and/or size.This need confirm through experiment according to the concrete condition of SCR catalyst converter equally.
According to an embodiment, in the SCR controlling method, comprise temperature according to a plurality of infinitesimals that calculate, the arithmetic mean value of the temperature through calculating each infinitesimal simply calculates the temperature of SCR catalyst converter.
According to another embodiment, in the SCR controlling method, comprise temperature according to a plurality of infinitesimals that calculate, the weighted mean value of the temperature through calculating each infinitesimal calculates the temperature of SCR catalyst converter.
Be appreciated that; The step 100-120 that in above-mentioned SCR controlling method, puts down in writing corresponds respectively to operation and/or the function of preceding text with reference to temperature prediction device 31, conversion ratio obtaining device 32 and emitted dose computing device 33 in the SCR control gear 3 of figure 1 description, and wherein step 200-220 corresponds respectively to specific operation and/or the function of preceding text with reference to the temperature prediction device 31 of figure 1 description.Thus, the characteristic described with reference to each device of SCR control gear 3 of preceding text is equally applicable to each step of SCR controlling method.And each step of putting down in writing in the SCR controlling method can be carried out and/or executed in parallel according to different orders.
In addition, should be appreciated that referring to figs. 2 and 3 the SCR controlling method of describing and to realize through computer program.For example, this computer program can comprise at least one computer-readable recording medium, and it has the computer readable program code part that is stored thereon.When computer-readable code part when for example processor is carried out, it is used to carry out the step of SCR controlling method.
Therefore, should be appreciated that under the situation that does not break away from the utility model true spirit, can make amendment, change and make up each mode of execution of the utility model.Description in this specification is only used for illustrative, and should not be considered to restrictive.The scope of the utility model only receives the restriction of appended claims.

Claims (5)

1. the temperature prediction device of a SCR catalyst converter is characterized in that comprising:
A plurality of infinitesimals of SCR catalyst converter,
The infinitesimal temperature computing device is connected to each infinitesimal of said SCR catalyst converter, is used for true temperature, physical parameter and engine exhaust flow according to the SCR catalyst converter, calculates the temperature of a plurality of infinitesimals, and
SCR catalyst temperature computing device is connected to a plurality of infinitesimals of said SCR catalyst converter, is used for the temperature according to a plurality of infinitesimals that calculate, and calculates the temperature of SCR catalyst converter.
2. device according to claim 1 is characterized in that said SCR catalyst converter comprises 2-10 infinitesimal.
3. device according to claim 2 is characterized in that said SCR catalyst converter comprises 5-6 infinitesimal.
4. according to each the described device among the claim 1-3, it is characterized in that annexation between a plurality of infinitesimals in the said SCR catalyst converter is to be connected in series or to be connected in parallel or connection that series parallel connection combines.
5. according to each the described device among the claim 1-3, it is characterized in that a plurality of infinitesimals in the said SCR catalyst converter have configurations differing from one and/or size.
CN201120178535XU 2011-05-20 2011-05-20 Temperature forecasting device of SCR (silicon-controlled rectifier) catalytic converter Expired - Lifetime CN202250321U (en)

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Application Number Priority Date Filing Date Title
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