An In-Cycle based NOx Reduction Strategy using Direct Injection of AdBlue

2014 ◽  
Vol 7 (4) ◽  
pp. 1984-1996 ◽  
Author(s):  
Kenan Muric ◽  
Ola Stenlaas ◽  
Per Tunestal ◽  
Bengt Johansson
Keyword(s):  
Direct Injection ◽  
Nox Reduction ◽  
Reduction Strategy

NOx Reduction Strategy by Staged Combustion with Plasma-Assisted Flame Stabilization

2012 ◽  
Vol 26 (7) ◽  
pp. 4284-4290 ◽  
Author(s):  
Dae Hoon Lee ◽  
Kwan-Tae Kim ◽  
Hee Seok Kang ◽  
Young-Hoon Song ◽  
Jae Eon Park
Keyword(s):  
Nox Reduction ◽  
Flame Stabilization ◽  
Staged Combustion ◽  
Reduction Strategy

A Numerical Study of NOx Reduction for a DI Diesel Engine With Complex Geometry

2004 ◽  
Vol 126 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Renshan Liu ◽  
Chao Zhang
Keyword(s):  
Diesel Engine ◽  
Thermal Efficiency ◽  
Fuel Injection ◽  
Complex Geometry ◽  
Numerical Study ◽  
Direct Injection ◽  
Nox Reduction ◽  
Geometrical Parameters ◽  
Injection Timing ◽  
Di Diesel Engine

A numerical study of NOx reduction for a Direct Injection (DI) Diesel engine with complex geometry, which includes intake/exhaust ports and moving valves, was carried out using the commercial computational fluid dynamics software KIVA-3v. The numerical simulations were conducted to investigate the effects of engine operating and geometrical parameters, including fuel injection timing, fuel injection duration, and piston bowl depth, on the NOx formation and the thermal efficiency of the DI Diesel engine. The tradeoff relationships between the reduction in NOx and the decrease in thermal efficiency were established.

Optimal Control of a Gasoline Direct Injection Engine

1999 ◽  
Author(s):  
I. Kolmanovsky ◽  
M. van Nieuwstadt ◽  
J. Sun ◽  
E. Gilbert
Keyword(s):  
Optimal Control ◽  
Fuel Economy ◽  
Direct Injection ◽  
Nox Reduction ◽  
Gasoline Direct Injection ◽  
Trapping Efficiency ◽  
Lean Nox Trap ◽  
Oxides Of Nitrogen ◽  
Lean Nox ◽  
Operation Results

Abstract This paper addresses a problem of optimizing the operation of a gasoline direct injection (GDI) engine equipped with a Three Way Catalyst (TWC) and a Lean NOx Trap (LNT). This engine can be operated significantly lean of stoichiometry. Lean operation results in reduced pumping losses and improved fuel economy. During lean operation the LNT is used to trap the oxides of nitrogen (NOx) that constitute a regulated pollutant. As the LNT loading with NOx increases, its trapping efficiency decreases. The trap can be purged of the stored NOx by operating the engine at slightly rich of stoichiometry conditions. A trade-off has to be found between fuel economy, which deteriorates with longer purge time, and NOx reduction. It is shown how this problem can be cast in the setting of optimal control and solved numerically.

Computational Fluid Dynamics Analysis of NOx Reduction by Ammonia Injection in the Man B&W 7s50mc Marine Engine

2014 ◽  
Vol 156 (A3) ◽  
Keyword(s):  
Numerical Model ◽  
Direct Injection ◽  
Nox Reduction ◽  
Water Injection ◽  
Injection Timing ◽  
Restrictive Temperature ◽  
Marine Engine ◽  
Computational Fluid Dynamics Analysis ◽  
Restrictive Legislation ◽  
Ammonia Injection

Taking into account the importance of NOx (nitrogen oxides) emissions from marine engines and the current increasingly restrictive legislation, this work aims to develop a numerical model to study NOx reduction. To this end, direct injection of NH3 (ammonia) into the combustion chamber was proposed in the MAN B&W 7S50MC marine engine. The numerical model was employed to analyse several injection temperatures, injection timings and ammonia to fuel ratios, obtaining NOx reductions of almost 60%. Besides, a comparison between ammonia injection and water injection was done. The results showed that ammonia is more efficient than water to reduce NOx with a negligible influence on other pollutants such as CO (carbon monoxide) and HC (hydrocarbons). Nevertheless, ammonia is efficient in a very restrictive temperature and injection timing range. This numerical model was compared with experimental measurements, obtaining satisfactory results which validate the work.

Optimized In Cylinder NOx Reduction Strategy for Meeting BSVI Emission Limits

2019 ◽  
Author(s):  
Anbarasu Muthusamy ◽  
Vagesh Shangar Ramani ◽  
Pranav Kumar Sinha ◽  
Giftson J ◽  
Sivasubramamanian R ◽  
...  
Keyword(s):  
Nox Reduction ◽  
Reduction Strategy ◽  
Emission Limits

EMISSION CHARACTERISTICS AND EGR APPLICATION OF BLENDED FUELS WITH BDF AND OXYGENATE (DMM) IN A DIESEL ENGINE

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2850-2855 ◽  
Author(s):  
SEUNG-HUN CHOI ◽  
YOUNG-TAIG OH
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Direct Injection ◽  
Nox Reduction ◽  
Specific Energy Consumption ◽  
Nox Emission ◽  
Biodiesel Fuel ◽  
Oxygenated Fuel ◽  
Blended Fuel ◽  
Blended Fuels

In this study, the possibility of biodiesel fuel and oxygenated fuel (dimethoxy methane ; DMM) was investigated as an alternative fuel for a naturally aspirated direct injection diesel engine. The smoke emission of blending fuel (biodiesel fuel 90vol-% + DMM 10vol-%) was reduced approximately 70% at 2500rpm, full load in comparison with the diesel fuel. But, engine power and brake specific energy consumption showed no significant differences. But, NOx emission of biodiesel fuel and DMM blended fuel increased compared with commercial diesel fuel due to the oxygen component in the fuel. It was needed a NOx reduction counter plan that EGR method was used as a countermeasure for NOx reduction. It was found that simultaneous reduction of smoke and NOx emission was achieved with BDF (95 vol-%) and DMM (5 vol-%) blended fuel and cooled EGR method (15%).

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