On-Road Evaluation of an Integrated SCR and Continuously Regenerating Trap Exhaust System

Kittelson, David B.; Watts, Winthrop F.; Walker, Andrew P.; Twigg, M. V.

doi:10.4271/2012-01-1088

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…Alternative configurations of aftertreatment devices in the exhaust line are possible. In [4][5][6][7], the integration of DPF and SCR catalysts in one place is proposed to reduce system size. The inclusion of a NOx trap [5] before the SCR system can significantly improve cold start behavior by capturing the NOx and releasing it when the SCR system is operational.…”

Section: Scr Configurationsmentioning

confidence: 99%

“…In [4][5][6][7], the integration of DPF and SCR catalysts in one place is proposed to reduce system size. The inclusion of a NOx trap [5] before the SCR system can significantly improve cold start behavior by capturing the NOx and releasing it when the SCR system is operational. The addition of an Ammonia Oxidation Catalyst (AOC) or Ammonia Slip Catalyst (ASC) after the SCR system is able to reduce the release of NH3 into the environment [6].…”

Section: Scr Configurationsmentioning

confidence: 99%

“…S refers to an unoccupied active catalytic site, and (NH 3 ) S refers to an NH3 molecule adsorbed at such a site (in the solid phase). Only such an absorbed NH3 molecule (NH 3 ) S is activated and therefore available for chemical reactions (3)(4)(5)8) with NOx.…”

Section: Reaction Kineticsmentioning

confidence: 99%

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The State of the Art in Selective Catalytic Reduction Control

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Section: Scr Configurationsmentioning

confidence: 99%

Section: Scr Configurationsmentioning

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Emissions From a Diesel Engine Operating in a Dual-Fuel Mode Using Port-Fuel Injection of Heated Hydrous Ethanol

Nord

Hwang

Northrop

2016

Journal of Energy Resources Technology

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Aftermarket dual-fuel injection systems in diesel engines using hydrous ethanol as secondary fuel have been developed as a means to lower emissions from older diesel-powered equipment. However, our previous work has shown that the emissions benefits of currently available aftermarket intake fumigation injection systems can be inconsistent with manufacturer claims. Our current study evaluates a newly developed aftermarket dual-fuel system that incorporates a fuel heating system and port fuel injection (PFI). This paper describes an experimental investigation of engine-out emissions from a John Deere 4045HF475 Tier 2 engine with port injection of 180 proof (90% ethanol by volume) hydrous ethanol. The engine was retrofitted with a custom fuel heat exchanger to heat the hydrous ethanol to a range of 46–79 °C for helping to improve fuel vaporization in the intake port. PFI duration was controlled using engine speed and throttle position as inputs to achieve a desired fumigant energy fraction (FEF), defined as the amount of energy provided by the hydrous ethanol based on lower heating value (LHV) over the total fuel energy provided to the engine. Data was collected over a range of FEF with direct injected diesel for eight operating modes comparing heated versus unheated hydrous ethanol. Results of the study indicate that as FEF increases, NO emissions decrease, while NO2, CO, THC, and unburned ethanol emissions increase. In addition, it was found that preheating the ethanol using engine coolant prior to injection has little benefit on engine-out emissions. The work shows that the implemented aftermarket dual-fuel PFI system can achieve FEF rates up to 37% at low engine load while yielding modest benefits in emissions.

show abstract

On-Road Evaluation of an Integrated SCR and Continuously Regenerating Trap Exhaust System

Cited by 2 publications

References 17 publications

The State of the Art in Selective Catalytic Reduction Control

The State of the Art in Selective Catalytic Reduction Control

Emissions From a Diesel Engine Operating in a Dual-Fuel Mode Using Port-Fuel Injection of Heated Hydrous Ethanol

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