The Effect of an External Fuel Injection on the Control of LNT System; the Diesel Nox Reduction System

2007 ◽  
Author(s):  
Gun-Woo Nam ◽  
Jin-Woo Park ◽  
Jin-Ha Lee ◽  
Gwon-Koo Yeo
Keyword(s):  
Fuel Injection ◽  
Nox Reduction ◽  
Reduction System

A New SOx Deactivation-Free NOx Reduction System Using Rh/Alumina and periodical Rich and Lean Conditions

1998 ◽  
Vol 27 (10) ◽  
pp. 1029-1030
Author(s):  
Tadao Nakatsuji ◽  
Ritsu Yasukawa ◽  
Keiichi Tabata ◽  
Kazuyuki Ueda ◽  
Miki Niwa
Keyword(s):  
Nox Reduction ◽  
Reduction System ◽  
Lean Conditions

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.

Particle Number Emissions of Nonroad Diesel Engines of Various Ages

2012 ◽  
Vol 134 (9) ◽  
Author(s):  
Seppo Niemi ◽  
Krister Ekman ◽  
Pekka Nousiainen
Keyword(s):  
Diesel Engines ◽  
Particle Number ◽  
New Technologies ◽  
Fuel Injection ◽  
Nox Reduction ◽  
Particle Size Range ◽  
Diesel Particulate ◽  
Diesel Particulate Filters ◽  
Particulate Filters ◽  
Injection Pump

Over the last two decades, gaseous and particle mass emissions of new diesel engines have been reduced effectively and progressively in response to the emissions legislation and due to the applied new technologies. There is, however, increasing concern about whether the engine modifications, while improving combustion and reducing emissions, have increased the number emissions of ultrafine and nanoparticles. So far, emissions regulations have solely been based on particulate matter (PM) mass measurements, not on particle number. Nanoparticles, however, form a major part of the PM emissions, but they do not considerably contribute to the PM mass and cannot be seen as a problem, if only PM mass is determined. Therefore, there is increasing interest in expanding the scope of the regulations to also include particle number emissions, e.g., Euro VI for on-road engines. The PM number limit will also be enforced for nonroad engines slightly later. Thus, more information is required about the particle number emissions themselves, but also about the effects of the engine technology on them. Wall-flow diesel particulate filters reduce the particle number very effectively within the entire particle size range. Nevertheless, in order to keep the filter as small as possible and to lessen the need for regeneration, the engine-out PM number should also be minimized. If the diesel particulate filters (DPFs) could be left out or replaced by a simpler filter, there would be greater freedom of space utilization or cost savings in many nonroad applications. This might be realized in installations where the engine is tuned at high raw NOx and a selective catalytic reduction (SCR) system is adopted for NOx reduction. However, it is not self-evident that new engine technologies would reduce the PM number emissions sufficiently. In this study, particle number emissions were analyzed in several nonroad diesel engines, representing different engine generations and exploiting different emissions reduction technologies: four- or two-valve heads, exhaust gas recirculation, different injection pressures and strategies, etc. All engines were turbocharged, intercooled, direct-injection nonroad diesel engines. Most engines used common-rail fuel injection technology. Comparisons were, however, also performed with engines utilizing either a distributor-type or an in-line fuel injection pump to see the long-term development of the particle number emissions. In this paper, the PM number emissions of nine nonroad diesel engines are presented and compared. Gaseous exhaust emissions and fuel consumption figures are also provided.

Direct Water Injection to Improve Diesel Spray Combustion

2003 ◽  
Author(s):  
Koji Takasaki ◽  
Tatsuo Takaishi ◽  
Hiroyuki Ishida ◽  
Keijirou Tayama
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Fuel Injection ◽  
Nox Reduction ◽  
Water Injection ◽  
Injection Pressure ◽  
Injection System ◽  
Injection Hole ◽  
Low Speed ◽  
Direct Water Injection

Now, it is essential to apply some measures for NOx reduction to low-speed diesel engines emitting much more NOx than high-speed engines. At the same time PM emission must be reduced especially when bunker fuel or heavy fuel is burned. This paper describes the applications of SFWI (Stratified Fuel Water Injection) system and DWI (Direct Water Injection) system to large sized diesel engines to reduce NOx and PM emission. SFWI system makes it possible to inject water during fuel injection from the same nozzle hole without mixing the liquids. DWI system injects water with high injection pressure from the other injection hole than the fuel injection hole into the combustion chamber directly. For testing both the systems, a 2-stroke-cycle low-speed test engine was used.

scholarly journals A Study on NOx Reduction Characteristics of LNT Catalyst with Fuel Injection Control in Light-duty Diesel Engine

2012 ◽  
Vol 20 (4) ◽  
pp. 150-155 ◽  
Author(s):  
Seung-Kwon Hwang ◽  
A-Hyun Ko ◽  
Joo-Wung Yoon ◽  
Cha-Lee Myung ◽  
Sim-Soo Park ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Nox Reduction ◽  
Light Duty ◽  
Injection Control ◽  
Reduction Characteristics

scholarly journals SCR NOx Reduction System and Machinery Outfitting

2013 ◽  
Vol 48 (1) ◽  
pp. 21-23
Author(s):  
Teruhisa Koga ◽  
Takaaki Kubo ◽  
Satoru Fukuya ◽  
Ryoma Aosaka
Keyword(s):  
Nox Reduction ◽  
Reduction System

scholarly journals A Study on Water-Induced Damage Severity on Diesel Engine Injection System Using Emulsified Diesel Fuels

Electronics ◽  
2021 ◽  
Vol 10 (18) ◽  
pp. 2285
Author(s):  
Min-Seop Kim ◽  
Ugochukwu Ejike Akpudo ◽  
Jang-Wook Hur
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Energy Demand ◽  
Fuel Injection ◽  
Nox Reduction ◽  
Cost Effective ◽  
Operating Conditions ◽  
Injection System ◽  
Diesel Fuels ◽  
Diesel Fuel Injection

Diesel engine emissions contribute nearly 30% of greenhouse effects and diverse health and environmental problems. Amidst these problems, it is estimated that there will be a 75% increase in energy demand for transportation by 2040, of which diesel fuel constitutes a major source of energy for transportation. Being a major source of air pollution, efforts are currently being made to curb the pollution spread. The use of water-in-diesel (W/D)-emulsified fuels comes as a readily available (and cost-effective) option with other benefits including engine thermal efficiency, reduced costs, and NOx reduction; nonetheless, the inherent effects—power loss, component wear, corrosion, etc. still pose strong concerns. This study investigates the behavior and damage severity of a common rail (CR) diesel fuel injection system using exploratory and statistical methods under different W/D emulsion conditions and engine speeds. Results reveal that the effect of W/D emulsion fuels on engine operating conditions are reflected in the CR, which provides a reliable avenue for condition monitoring. Also, the effect of W/D emulsion on injection system components-piston, nozzle needle, and ball seat–are presented alongside related discussions.

Sign in / Sign up

Export Citation Format

Share Document