Development of a 3D Numerical Model for Predicting Spray, Urea Decomposition and Mixing in SCR Systems

Yi, Yaxing

doi:10.4271/2007-01-3985

Cited by 26 publications

(12 citation statements)

References 12 publications

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“…The setups have two-equation models for the simulation of the measured ammonia uniformity. The error value for the velocity magnitude model is a good agreement to observe the validated literature cases for the k-epsilon model in the SCR system simulation [2] [11]. By considering the complete process from UWS spray to the ammonia distribution in the optical box.…”

Section: Validation Of Simulationsupporting

confidence: 73%

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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.

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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.

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Section: Validation Of Simulationsupporting

confidence: 73%

“…Yi [11] has analyzed the ammonia homogenization from two different mixers with renormalizing of Navier-Stokes equations (RNG) and the k-epsilon model for turbulence study. The computational fluid dynamic (CFD) model of their research simple SCR system installation.…”

Section: A Mathematical Modelmentioning

confidence: 99%

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.

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“…Numerical simulation has benefited from the steady improvement of computational fluid dynamics (CFD) and represents now an effective means for analysing different scenarios in reasonable time [27]. CFD is commonly used to estimate the effects of some design parameters on the behaviour of the urea-water spray in the exhaust pipe.…”

Section: Introductionmentioning

confidence: 99%

A methodology to investigate the behaviour of urea-water sprays in high temperature air flow for SCR de-NOxapplications

Postrioti

Brizi

Ungaro

et al. 2015

Fuel

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“…As UWS droplet is essentially a bi‐component mixture, some researchers suggested to divide the decomposition process of UWS droplet into two consecutive stages; (i) complete evaporation of water followed by (ii) urea depletion through vaporization and/or decomposition 21, 24–29. Although the vaporization process of water content can be modeled using a well‐established vaporization model,30, 31 the depletion of urea requires the development and implementation of special model.…”

Section: Introductionmentioning

confidence: 99%

“…In that sense, Birkhold et al26 used a seemingly appropriate reduced reaction mechanism with reaction enthalpy equals to the vaporization and decomposition enthalpies. The reduced reaction mechanism implemented by Birkhold et al26 is an improvement over the oversimplified reduced reaction mechanism used by Yi 27. The hydrolysis of isocyanic acid was modeled in Ref 26.…”

Section: Introductionmentioning

confidence: 99%

Modeling the depleting mechanism of urea‐water‐solution droplet for automotive selective catalytic reduction systems

Abu-Ramadan

Saha

2011

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).The current work aims to develop a reliable theoretical model capable of simulating the depletion process of urea-water-solution (UWS) droplets injected in a hot exhaust stream as experienced in an automotive urea-based selective catalytic reduction system. A modified multicomponent vaporization model is presented and implemented in the current study to simulate the behavior of UWS droplet in heated environment. Although water depletion is modeled as a vaporization process, urea depletion is modeled using two different approaches: (i) vaporization and (ii) direct thermal decomposition. The suitability of both depletion approaches is assessed in the current study by comparison with experimental data of the decay of a single UWS droplet in a quiescent heated environment. The decay rate of UWS droplet is accurately predicted with the multicomponent vaporization model. The possibility of internal gasification is demonstrated. Based on the complex decomposition behavior of urea, the current study proposes a decomposition mechanism for UWS droplet. The suitability of implementing the rapid mixing approach is assessed through comparison with the diffusion limit approach at various operating conditions and initial UWS droplet sizes. V V C 2011 American Institute of Chemical Engineers AIChE J, 57: 3210-3225, 2011

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Development of a 3D Numerical Model for Predicting Spray, Urea Decomposition and Mixing in SCR Systems

Cited by 26 publications

References 12 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

A methodology to investigate the behaviour of urea-water sprays in high temperature air flow for SCR de-NOxapplications

Modeling the depleting mechanism of urea‐water‐solution droplet for automotive selective catalytic reduction systems

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