Modeling of Urea-Water Solution Injection Spray in SCR System

To control the emissions from the diesel engines of modern automobiles, it requires the development of adequate and advanced exhaust gas aftertreatment devices. Selective Catalytic Reduction (SCR) is a method that can be used in mobile diesel engine aftertreatment systems to reduce harmful NOx emissions. Due to the toxicity and handling problems of ammonia, currently injection of a liquid Urea-Water Solution (UWS) into the exhaust stream approach is used. The water evaporates and the urea undergoes thermal decomposition producing ammonia that reacts with the NOx in the exhaust gas inside a SCR catalyst to produce nitrogen and water vapor. This work presents the study of UWS injection spray using commercial available CFD code, Fire v8.3. The evaporation of water from a single droplet of UWS is investigated theoretically and droplets are treated with Lagrangian particle tracking. Simulation study at different exhaust gas temperatures and injector locations is carried out and compared with experimental values. Thus, the present study results predict the local distribution and the conversion of the reducing agent.

Download Full-text

Model based control for a Selective Catalytic Reduction (SCR) system in an exhaust gas aftertreatment system for a diesel engine

2013 International Conference on Energy Efficient Technologies for Sustainability ◽

10.1109/iceets.2013.6533477 ◽

2013 ◽

Cited By ~ 4

Author(s):

W. A. Rasheed ◽

P. Goyal ◽

C. Joseph

Keyword(s):

Diesel Engine ◽

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Exhaust Gas ◽

Model Based Control ◽

Aftertreatment System ◽

Model Based ◽

Exhaust Gas Aftertreatment ◽

Scr System

Download Full-text

Get the Most Out of Your Gas Turbine SCR NOx Abatement System

Volume 1: Turbo Expo 2003 ◽

10.1115/gt2003-38245 ◽

2003 ◽

Author(s):

Martin F. Collins ◽

S. Mario DeCorso ◽

David L. Moen

Keyword(s):

Catalytic System ◽

System Performance ◽

Catalytic Reduction ◽

Exhaust Gas ◽

Scr Catalyst ◽

Equipment Operation ◽

Scr System ◽

Scr Of Nox ◽

Design Construction ◽

Turbine Exhaust

Selective catalytic reduction (SCR) of NOx from turbine exhaust has been used successfully for at least 12 years. With this process, ammonia (NH3) is mixed with the exhaust gas before it passes through the SCR catalyst where the ammonia reacts selectively with the NOx, producing nitrogen and water. To make this simple reaction work properly over the life of the plant requires attention to issues during design and fabrication of the equipment, operation of the system, and quality control. There are a total of more than 25 issues involved. When all of these issues are recognized and addressed properly, the SCR catalytic system will produce the specified performance for the planned life of the catalyst. This paper identifies, describes, and discusses each of these issues. Most cases of unsatisfactory SCR turbine system performance can be traced to one or more of these issues being overlooked or not addressed properly in the design, construction, or operation of the catalytic system. The purpose of this paper is to make turbine system users aware of what must be done to get the most out of their SCR system.

Download Full-text

Prospects for the use of dry carbamide in diesel exhaust gas aftertreatment systems

Traktory i sel'hozmashiny ◽

10.31992/0321-4443-2019-6-3-14 ◽

2019 ◽

pp. 3-14

Author(s):

V.N. Kaminskij ◽

◽

G.G. Nadarejshvili ◽

V.I. Panchishnyj ◽

R.M. Zagredinov ◽

...

Keyword(s):

Diesel Exhaust ◽

Exhaust Gas ◽

Exhaust Gas Aftertreatment ◽

Aftertreatment Systems

Download Full-text

An Experimental Study for NOx - Emission Reduction with Urea-SCR Technology in Vehicular Diesel Engines

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.2089 ◽

2011 ◽

Vol 71-78 ◽

pp. 2089-2093 ◽

Cited By ~ 2

Author(s):

Qian Wang ◽

Ming Xing Zhou ◽

Bao Yi Wang

Keyword(s):

Fuel Consumption ◽

Control Strategy ◽

Catalytic Reduction ◽

Water Solution ◽

Open Loop ◽

Loop Control ◽

Consumption Ratio ◽

Future Emission ◽

System Configurations ◽

Scr System

In order to fulfill future emission standards for middle and heavy-duty vehicles like state Ⅳ and Ⅴ, advanced measures on exhaust gas and engine functionality are required. Selective Catalytic Reduction (SCR) technology is the unique technology currently which can improve the emission and reduce fuel consumption simultaneously. Firstly the reductants and its chemical reactions, SCR system configurations and its working principle and urea dosing control strategy are introduced. Then tests are conducted on a diesel engine with SCR system at bench. The results of ESC cycle show that NOx emission is decreased by more than 67% with the open-loop control strategy. Additionally, the urea and fuel consumption and ammonia leakage have been compared and analyzed respectively, the experiment data indicates that the urea water solution consumption ratio is only 5.7% of fuel for this SCR system, while its average ammonia slip is below 5 ppm.

Download Full-text

Highly integrated exhaust gas aftertreatment systems in heavy-duty applications

Proceedings - Internationaler Motorenkongress 2017 ◽

10.1007/978-3-658-17109-4_36 ◽

2017 ◽

pp. 543-554

Author(s):

S. Schaml ◽

D. Rothe ◽

F. Lutz ◽

F. I. Zuther

Keyword(s):

Exhaust Gas ◽

Heavy Duty ◽

Exhaust Gas Aftertreatment ◽

Aftertreatment Systems

Download Full-text

Fundamental research on pre-turbo exhaust gas aftertreatment systems

Proceedings - 20. Internationales Stuttgarter Symposium ◽

10.1007/978-3-658-29943-9_26 ◽

2020 ◽

pp. 315-336

Author(s):

Martin Angerbauer ◽

M. Grill ◽

M. Bargende ◽

F. Inci

Keyword(s):

Exhaust Gas ◽

Exhaust Gas Aftertreatment ◽

Fundamental Research ◽

Aftertreatment Systems

Download Full-text

Impact of European Real-Driving-Emissions Legislation on Exhaust Gas Aftertreatment Systems of Turbocharged Direct Injected Gasoline Vehicles

10.4271/2017-01-0924 ◽

2017 ◽

Cited By ~ 6

Author(s):

Jan Schoenhaber ◽

Nikolas Kuehn ◽

Bastian Bradler ◽

Joerg Michael Richter ◽

Sascha Bauer ◽

...

Keyword(s):

Exhaust Gas ◽

Exhaust Gas Aftertreatment ◽

Gasoline Vehicles ◽

Aftertreatment Systems

Download Full-text

3-D Numerical Study of Effect of Flow Parameters upon the Uniformity of NH3 in Urea-SCR

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.505.175 ◽

2012 ◽

Vol 505 ◽

pp. 175-179 ◽

Cited By ~ 6

Author(s):

R. Vikas ◽

J.M. Mallikarjuna ◽

V. Ganesan

Keyword(s):

Catalytic Reduction ◽

Numerical Study ◽

Water Solution ◽

Injection Pressure ◽

Exhaust Gas ◽

Oxides Of Nitrogen ◽

Lean Burn ◽

Flow Parameters ◽

Ammonia Slip ◽

Engine Emission

Nowadays, due to the stringent engine emission norms, an efficient technique is required to reduce oxides of nitrogen (NOX) from automobiles especially from the lean burn engines. Although Urea Selective Catalytic Reduction (SCR) is capable of satisfying these norms, the ammonia slip nullifies its advantages. Ammonia slip is mainly due to the lack of uniformity of ammonia at the monolith entrance. The uniformity of ammonia distribution mainly depends upon the flow parameters of exhaust gas and the injection parameters of urea water solution. The current study addresses the effect of flow parameters, temperature and flow rate of exhaust gas on the injection pressure. The results obtained reveals useful guidelines for enhancing the uniformity of ammonia in Urea-SCR.

Download Full-text