An Integrated SCR and Continuously Regenerating Trap System to Meet Future NOx and PM Legislation

Chandler, G. R.; Cooper, Barry; Harris, Jerome S.; Thoss, J. E.; Uusimäki, Ari; Walker, Andrew P.; Warren, James P.

doi:10.4271/2000-01-0188

Cited by 58 publications

(15 citation statements)

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“…The auxiliary oxidation catalyst in this system is used to increase the NO 2 concentration in the exhaust gases. Laboratory studies [Chandler et al 2000;Gieshoff 2001] have confirmed that the efficiency in NO X abatement increases with an elevated NO 2 concentration at the inlet of the main SCR catalyst. The optimum NO 2 /NO ratio was reported to be near 1:1 [Gieshoff 2000;Koebel et al 2002;Goo et al 2007] .…”

Section: Scr Technologymentioning

confidence: 92%

“…Studies have reported that the majority of the slipped ammonia (NH 3 ) undergoes complete oxidation to NO and NO 2 over the ASC [Havenith and Verbeek 1997]. NH 3 concentrations at the tailpipe, resulting from NH 3 slip [Chandler et al 2000] , have been found to be below 25 parts per million, the ambient ammonia ACGIH TWA/TLV (American Conference of Governmental Industrial Hygienists, time-weighted average / threshold limit value). Therefore, a possible NH 3 slip from an SCR system should not pose a problem and would not require additional ventilation air in underground work areas.…”

Section: Scr Technologymentioning

confidence: 99%

“…Recently, an integrated aftertreatment system with an SCR and DPF, trademarked SCRT, has become available [Chandler et al 2000;R ice et al 2008]. The SCRT technology consists of a CRT system, described in Section 2.2.2.2, followed by an SCR section.…”

Section: Effects Of An S Cr On Emissionsmentioning

confidence: 99%

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Diesel aerosols and gases in underground mines: guide to exposure assessment and control.

Bugarski¹,

Cauda²,

Janisko³

et al. 2011

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Section: Scr Technologymentioning

confidence: 92%

Section: Scr Technologymentioning

confidence: 99%

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Diesel aerosols and gases in underground mines: guide to exposure assessment and control.

Bugarski¹,

Cauda²,

Janisko³

et al. 2011

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“…Maintaining "fast-SCR" or optimum NO2/NOx ratios has further potential to increase the SCR performance, even at lower temperatures (Koebel et al, 2002). From a study performed by Chandler, shows that the control of SCR catalyst activity can be significantly varied by having NO2 in the exhaust gas, especially at low exhaust temperatures (Chandler et al, 2000). Figure 2, illustrates such catalyst activities where at lower temperature ranges (175 to 300°C), NOx conversion efficiency tends to remain above 90% when feeding NO2 as a feed gas than compared to not having any NO2 at all in the exhaust stream.…”

Section: Urea-scr Catalytic Reactionsmentioning

confidence: 99%

Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management

Pradhan

2015

SAE Technical Paper Series

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Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management Saroj Pradhan Heavy-duty diesel (HDD) engines are the primary propulsion source for most heavy-duty vehicle freight movement and have been equipped with an array of aftertreatment devices to comply with more stringent emissions regulations. In light of concerns about the transportation sector's influence on climate change, legislators are introducing requirements calling for significant reductions in fuel consumption and thereby, greenhouse gas (GHG) emission over the coming decades. Advanced engine concepts and technologies will be needed to boost engine efficiencies. However, increasing the engine's efficiency may result in a reduction in thermal energy of the exhaust gas, thus contributing to lower exhaust temperature, potentially affecting after-treatment activity, and consequently emissions rate of regulated pollutants. iii TABLE OF CONTENTS CHAPTER 1 INTRODUCTION .

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“…[13][14][15] SCR systems require the use of urea to generate ammonia on-board a vehicle to reduce NO x . 16 Urea fluid is not traditionally found on-board a vehicle.…”

Section: Introductionmentioning

confidence: 99%

Lean NO_x trap supplemental energy savings with a long breathing strategy

Jeftić

Zheng

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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Current and upcoming diesel engine emission regulations in the USA and in Europe stipulate significant reductions of nitrogen oxide emissions. To satisfy these emission regulations and to maintain high fuel efficiency, energy efficient diesel after-treatment to remove nitrogen oxides is required. In this study, a long breathing (long adsorption) strategy was investigated for the reduction of supplemental energy consumption of a diesel lean nitrogen oxide trap. The long breathing strategy would be enabled by moderate exhaust gas recirculation to reduce the engine-out nitrogen oxide levels. With reduced feed gas nitrogen oxide levels, the adsorption time of the lean nitrogen oxide trap could be extended, leading to less frequent fuel-rich regeneration of the lean nitrogen oxide trap. Proof of concept studies were undertaken on a diesel engine to demonstrate the enabling of the long breathing lean nitrogen oxide trap strategy, while further tests were undertaken on a flow bench set-up to demonstrate the potential energy savings with the long breathing lean nitrogen oxide trap strategy. The test results indicated that, at the selected operating conditions, the long breathing strategy could be enabled by reducing the engine-out nitrogen oxide from 110 ppm to 50 ppm via moderate exhaust gas recirculation. The flow bench test results indicated that the adsorption time of the lean nitrogen oxide trap increased exponentially when the feed gas nitrogen oxide level was reduced. The longer adsorption led to supplemental energy savings in excess of 60% when the feed gas nitrogen oxide level was reduced from 110 ppm to 50 ppm. Furthermore, it was calculated that the long breathing lean nitrogen oxide trap strategy enabled a higher overall indicated efficiency of 36.4% compared to 35.9% with a conventional lean nitrogen oxide trap strategy.

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An Integrated SCR and Continuously Regenerating Trap System to Meet Future NOx and PM Legislation

Cited by 58 publications

References 0 publications

Diesel aerosols and gases in underground mines: guide to exposure assessment and control.

Diesel aerosols and gases in underground mines: guide to exposure assessment and control.

Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management

Lean NO_x trap supplemental energy savings with a long breathing strategy

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An Integrated SCR and Continuously Regenerating Trap System to Meet Future NOx and PM Legislation

Cited by 58 publications

References 0 publications

Diesel aerosols and gases in underground mines: guide to exposure assessment and control.

Diesel aerosols and gases in underground mines: guide to exposure assessment and control.

Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management

Lean NOx trap supplemental energy savings with a long breathing strategy

Contact Info

Product

Resources

About

Lean NO_x trap supplemental energy savings with a long breathing strategy