Optical Investigation on the Ability of a Cordierite Substrate Mixing Device to Combat Deposits in SCR Dosing Systems

Lockyer, Thomas O.; Reid, Benjamin; Hargrave, Graham K.; Gaynor, Paul D.; Wilson, Jonathan

doi:10.4271/2015-01-1039

Cited by 8 publications

(9 citation statements)

References 11 publications

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“…The pressure from UWS injector was ranging from 4 to 6 bar, the ammonia injection rate (0.04 g/s) and exhaust temperature constant in 338 K -553 K [5][6] [16]. The injection specification is presented in Table 2.…”

Section: ) Urea Water Solution Injectionmentioning

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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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: ) Urea Water Solution Injectionmentioning

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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“…The maximum spreading diameter has been reported to be one of the most important parameters in many applications. In SCR systems, the maximum spreading diameter affects the heat transfer from the wall to the liquid which is crucial for the evaporation and thermolysis of urea-water-solution and the deposit formation (Lockyer et al, 2015). The binder droplet maximum spreading performance on the surface of hydroxyapatite microspheres can affect the quality of printed bone scaffolds (Wang et al, 2015).…”

Section: Maximum Spreading Diameter ( )mentioning

confidence: 99%

“…In addition, Cordierite ceramics can be used up to approximately 1200°C (Rohan et al, 2004) so they are widely used in SCR systems and other high temperature chemical engineering systems. The data generated from this study is vital to understand and predict the physical and chemical process in order to develop a highefficiency SCR systems (Lockyer et al, 2015) and in other applications using high-temperature porous substrates.…”

Section: Maximum Spreading Diameter ( )mentioning

confidence: 99%

“…Developing an understanding of the behaviour of liquid droplets impacting on porous surfaces and the subsequent spreading process is significant in many industrial applications. In transportation, recent developments in selective catalytic reduction (SCR) for Diesel engines (Lockyer et al, 2015) requires control of the impingement process of urea droplets on porous catalyst surfaces to optimize the decomposition processes that generate ammonia which is used to reduce NOx emissions. In the manufacturing industry, binder jetting technology is used to construct parts such as skeletal replacements and porous biological scaffolds for reconstructive surgery (Wang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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The dynamics of droplet impact on a heated porous surface

Zhao

Hargrave

Versteeg

et al. 2018

Chemical Engineering Science

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In this paper, droplet impact on a porous surface is experimentally investigated over a wide range of Weber numbers and surface temperatures. Regime transition criteria have been deduced to determine droplet post-impingement behaviour as a function of the Weber number and surface temperature for which a droplet impacting on a porous surface. Based on the energy balance, an analytical model with improved boundary layer description is proposed to predict maximum spreading of droplet following impact on porous surfaces when the effect of heat transfer is negligible. The results of the model indicate that the spreading process after droplet impact on porous surfaces is governed by the viscous dissipation and matric potential. The maximum-spread model predictions agreed well with experimental measurements reported in this paper and the literature over a large range of Weber numbers and different porous surfaces. Highlights: •The dynamics of droplet impact on a heated porous surface is studied experimentally. •A new impact regime map together with regime transition criteria is proposed to determine droplet post-impingement behaviour. •Significant differences are found between droplet impact on impermeable surfaces and porous surfaces. •An analytical model with improved boundary layer description is developed to predict maximum spreading. •The maximum-spread model predictions agree well with experiments.

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“…To study the prevention of low-temperature crystallization, Ström et al proposed that the addition of adiabatic insulation can effectively reduce the amount of sediment formation [23]. However, this type of mixer needs to match the type of spray, otherwise it will be detrimental to the decomposition of urea [24]. Based on the thermodynamic properties of the wall membrane in computational fluid dynamics, Henrik et al accurately predicted the risk of formation of sediments in the rotary vane mixer, and systematically studied the depletion rate of the components at different reaction temperatures.…”

mentioning

confidence: 99%

Application Study on a New Hybrid Canning Structure of After-Treatment System for Diesel Engine

et al. 2020

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Based on the airflow rotation concept, a new packaging structure was designed to meet the performance requirements of China-VI stage emission regulations. The new structure is a hybrid structure of spiral space with small blades and conical plates. The Computational Fluid Dynamics (CFD) simulation was used to analyze the velocity uniformity and ammonia uniformity of the flow field, and the results showed that velocity uniformity and ammonia uniformity were higher than 0.95, and the possibility of crystallization risk was very low. The actual performance of the new structural prototype was verified by means of engine bench testing. The test results were excellent and the conversion efficiency reached 0.96. The new selective catalytic reduction (SCR) urea mixed structure design greatly improved the conversion efficiency of the after-treatment system and has excellent anti-crystallization performance.

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Optical Investigation on the Ability of a Cordierite Substrate Mixing Device to Combat Deposits in SCR Dosing Systems

Cited by 8 publications

References 11 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

The dynamics of droplet impact on a heated porous surface

Application Study on a New Hybrid Canning Structure of After-Treatment System for Diesel Engine

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