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Development of a variable resistance-capacitance model with time delay for urea-SCR system
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  • Journal title : Environmental Engineering Research
  • Volume 20, Issue 2,  2015, pp.155-161
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2014.034
 Title & Authors
Development of a variable resistance-capacitance model with time delay for urea-SCR system
Feng, Tan; Lu, Lin;
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 Abstract
Experimental research shows that the nitric oxides () concentration track at the outlet of selective catalytic reduction (SCR) catalyst with a transient variation of Adblue dosage has a time delay and it features a characteristic of resistance-capacitance (RC). The phenomenon brings obstacles to get the simultaneously expected to be reduced and equi-molar ammonia available to SCR reaction, which finally inhibits conversion efficiency. Generally, engine loads change frequently, which triggers a rapid changing of Adblue dosage, and it aggravates the air quality that are caused by emission and ammonia slip. In order to increase the conversion efficiency of and avoid secondary pollution, the paper gives a comprehensive analysis of the SCR system and tells readers the key factors that affect time delay and RC characteristics. Accordingly, a map of time delay is established and a solution method for time constant and proportional constant is carried out. Finally, the paper accurately describes the input-output state relation of SCR system by using "variable RC model with time delay". The model can be used for a real-time correction of Adblue dosage, which can increase the conversion efficiency of in SCR system and avoid secondary pollution forming. Obviously, the results of the work discover an avenue for the SCR control strategy.
 Keywords
Diesel engine;Urea-SCR;Weight analysis;Time delay;Resistance-capacitance;
 Language
English
 Cited by
1.
Kinetic Modelling and Model based Control of SCR Deposit, MATEC Web of Conferences, 2016, 82, 01009  crossref(new windwow)
 References
1.
Johnson T. Diesel emission control technology review. In: Diesel Engine-efficiency and emissions research (DEER) conference; 2006 Aug 20-24; Detroit.

2.
Bonfils A, Creff Y, Lepreux O, Petit N. Closed-loop control of a SCR system using a $NO_X$ sensor cross-sensitive to $NH_3$. J. Process Control 2014;24:368-378.

3.
Lepreux O, Creff Y, Petit N. Model-based temperature control of a diesel oxidation catalyst. J. Process Control 2012;22:41-50. crossref(new window)

4.
Petit N. Model-based control of automotive engines and after-treatment devices. In: IFAC Joint conference; 2013 Feb 4-6; Grenoble.

5.
Zhang SM, Tian F, Ren GF, Yang L. SCR control strategy based on ANNs and fuzzy PID in a heavy-duty diesel engine. Int. J. Automotive Technol. 2012;13:693-699. crossref(new window)

6.
Hsieh MF, Wang J. Development and experimental studies of a control-oriented SCR model for a two-catalyst urea-SCR system. Control Eng. Pract. 2011;19:409-422. crossref(new window)

7.
Su Y, Li J, Gao Y, Qu D. Applying Matlab/Simulink to study calculation of $NO_X$ efficiency of the SCR. Procedia Environ. Sci. 2011;11:996-1000. crossref(new window)

8.
Faghihi EM, Shamekhi AH. Development of a neural network model for selective catalytic reduction (SCR) catalytic converter and ammonia dosing optimization using multi objective genetic algorithm. Chem. Eng. J. 2010;165:508-516. crossref(new window)

9.
Hsieh MF, Wang J. Adaptive and efficient ammonia storage distribution control for a two-catalyst selective catalytic reduction system. J. Dyn. Sys. Meas. Control 2012;134:1201-1211.

10.
Devarakonda M, Parker G, Johnson JH, Strots V. Model-based control system design in a urea-SCR aftertreatment system based on $NH_3$ sensor feedback. Int. J. Automotive Technol. 2009;10:653-662. crossref(new window)

11.
Lu L, Wang L. Model-based optimization of parameters for a diesel engine SCR system. Int. J. Automotive Technol. 2013;14:13-18. crossref(new window)

12.
Schwammle T, Bertsche F, Hartung A, Brandenstein J, Heidel B, Scheffknecht G. Influence of geometrical parameters of honeycomb commercial SCR-$DeNO_X$-catalysts on $DeNO_X$-activity, mercury oxidation and $SO_2$/$SO_3$-conversion. Chem. Eng. J. 2013;222:274-281. crossref(new window)