Effects of Urea Injection Timing on Predicting NoX Conversion In SCR Systems

Wardana, Muhammad Khristamto Aditya; Oh, Kwang Chul; Lee, Young Jae; Woo, Young Min

doi:10.1007/s12239-020-0014-y

Cited by 10 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Heating wall temperature propagates by flowing heat of exhaust gas from inlet to the outlet, more high gas flows from the exhausts more heat of the wall temperature, and its effects on the reduction ammonia droplet in the wall. This statement also has been explained in our previous study [7] which is observed the wall temperature value for predict the urea injection process in the SCR system. Figure 5 shows the velocity magnitude quality.…”

Section: Resultssupporting

confidence: 79%

“…An underestimated turbulent viscosity value in the equation model can be stable by reducing the Schmidt number value (0.7 -0.9). Throughout the following investigations by Wardana [7], the turbulent Schmidt number for Standard k-epsilon Low-Reynolds Number model used the default value of 1.0 for described in this literature review. [12] was implemented using STARCCM+ for simulation which then compared by experimental works to get the best accuracy.…”

Section: A Mathematical Modelmentioning

confidence: 99%

“…Many researchers study around the injector for spraying urea (NH 3 ), gas temperature, and catalyst substrate in the SCR system, but the ammonia still difficult to mix with NO x . Based on our previous study [7], it has been mentioned that the urea is difficult to evaporate and easily attached to the wall and making the solid deposit in the system. It is consistent with the study carried out by Hasan [8] which found the solid deposited effect to the mixing process at the SCR system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

Wardana

2020

J. Mechatron. Electr. Power Veh. Technol.

Self Cite

View full text Add to dashboard Cite

Diesel engines are commonly used for public transportation on-road and off-road applications. Growth production of the diesel engine is very significant from year to year. Nitride Oxide (NOx) from diesel engine was one of the major sources of air pollution. Selective Catalytic Reduction (SCR) has been successfully used to reduce NOx from a diesel engine with a chemical reaction from ammonia (NH3). The mixing reaction between NOx and NH3 reaction can produce steam (H2O) and Nitrogen (N2). However, ammonia uniformity pattern usually not homogenization and the ammonia was difficult to mix with NOx. The constant air flows incomplete to assist the spray injector to spread NH3 to all corners of SCR. The impact study of turbulent phenomena and standard k-epsilon Low-Reynolds Number model to the mixing process in the SCR system using STARCCM+. The simulation studies are conducted under different pressure (4 to 6 bars), the injection rate (0.04 g/s) and temperature (338 K – 553 K) and the high pressure and high velocity magnitude creating turbulent swirl flow. The ammonia decomposition process and mixing process with NOx were investigated using a box with optical access. The simulation and numerical study results validated using back pressure value and the distribution of NOx concentration value from the catalyst outlet. The wall temperature will increase the urea evaporation to generate ammonia and gas pressure will increase the mixing process and chemical process in the SCR system. These reactions enable to optimize the SCR system technology which eventually able to reduce the NOx quantity from a diesel engine.

show abstract

Section: Resultssupporting

confidence: 79%

Section: A Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

Wardana

2020

J. Mechatron. Electr. Power Veh. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…For heavy-duty diesel cars, engine tuning can help to achieve compliance with the latest EURO 3 emission standards. Several inengine technologies, including intercooling, turbocharging, injection rate shaping, injection pressure, injection time, development of smart controllers, and exhaust gas recirculation (EGR) have been employed to comply with legal requirements [19,20]. While some of these technologies are still in the development stage, others, such as homogeneous charge compression ignition (HCCI), suggest that future legislation will call for an aftertreatment system to reduce NOx and PM emissions to the necessary levels [21,22].…”

Section: Introductionmentioning

confidence: 99%

Review of Improving the NOx Conversion Efficiency in Various Diesel Engines fitted with SCR System Technology

Wardana

2022

Catalysts

Self Cite

View full text Add to dashboard Cite

The diesel engine is utilized in most commercial vehicles to carry items from various firms; nevertheless, diesel engines emit massive amounts of nitrogen oxides (NOx) which are harmful to human health. A typical approach for reducing NOx emissions from diesel engines is the selective catalytic reduction (SCR) system; however, several reasons make reducing NOx emissions a challenge: urea particles frequently become solid in the injector and difficult to disseminate across the system; the injector frequently struggles to spray the smaller particles of urea; the larger urea particles from the injector readily cling to the system; it is also difficult to evaporate urea droplets because of the exhaust and wall temperatures (Tw), resulting in an increase in solid deposits in the system, uncontrolled ammonia water solution injection, and NOx emissions problems. The light-duty diesel engine (LDD), medium-duty diesel engine (MDD), heavy-duty diesel engine (HDD), and marine diesel engine use different treatments to optimize NOx conversion efficiency in the SCR system. This review analyzes several studies in the literature which aim to increase NOx conversion in different diesel engine types. The approach and methods demonstrated in this study provide a suitable starting point for future research into reducing NOx emissions from diesel engines, particularly for engines with comparable specifications.

show abstract

“…Wardana et al used two kinds of urea injection devices to study the ammonia uniformity of an SCR system . At the same time, the ammonia uniformity and urea injection time were studied to predict the NO x reduction efficiency of an SCR system. , Ehson et al realized the chromatographic measurement of ammonia concentration in a diesel engine exhaust . Stritzke et al used a tunable diode laser absorption spectrometer (TDLAS) to study the ammonia concentration distribution characteristics .…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Distribution Characteristics of NO_x Conversion Efficiency of a Diesel Engine SCR Catalyst

Wang

Li³

et al. 2021

ACS Omega

View full text Add to dashboard Cite

An experimental investigation of the distribution characteristics of NO x conversion efficiency inside a selective catalytic reduction system is presented in this paper. Wash-coated and extruded vanadium-based selective catalytic reduction catalysts were investigated under an ANR (ammonia nitrogen ratio) of 1.0 and various exhaust gas temperature and flow rate conditions. A moveable sampling probe was located at various measuring points on the exit cross section of the selective catalytic reduction catalyst shell, and the final distribution maps of NO x conversion efficiency were obtained by the interpolation of measured data. The experimental result showed that the distribution of NO x conversion efficiency of the wash-coated selective catalytic reduction catalyst at the exit cross section was extremely nonuniform and the efficiency of the extruded SCR catalyst was uniform with a higher distribution at the center. A comparison experiment with 180° rotation of the selective catalytic reduction catalysts was implemented, and the efficiency distribution map of the wash-coated selective catalytic reduction catalyst also rotated 180° but that of the extruded selective catalytic reduction catalyst remained unchanged. The uniformity coefficient of the extruded selective catalytic reduction catalyst was higher than that of the wash-coated selective catalytic reduction catalyst used in this study.

show abstract

Effects of Urea Injection Timing on Predicting NoX Conversion In SCR Systems

Cited by 10 publications

References 15 publications

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

Review of Improving the NOx Conversion Efficiency in Various Diesel Engines fitted with SCR System Technology

Experimental Research on Distribution Characteristics of NO_x Conversion Efficiency of a Diesel Engine SCR Catalyst

Contact Info

Product

Resources

About

Effects of Urea Injection Timing on Predicting NoX Conversion In SCR Systems

Cited by 10 publications

References 15 publications

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

Review of Improving the NOx Conversion Efficiency in Various Diesel Engines fitted with SCR System Technology

Experimental Research on Distribution Characteristics of NOx Conversion Efficiency of a Diesel Engine SCR Catalyst

Contact Info

Product

Resources

About

Experimental Research on Distribution Characteristics of NO_x Conversion Efficiency of a Diesel Engine SCR Catalyst