NDLI: Air Separation Membranes: An Alternative to EGR in Large Bore Natural Gas Engines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Biruduganti, Munidhar Gupta, Sreenath Bihari, Bipin Mcconnell, Steve Sekar, Raj
Copyright Year	2009
Abstract	Air Separation Membranes (ASM) could potentially replace Exhaust Gas Recirculation (EGR) technology in engines due to the proven benefits in NOx reduction but without the drawbacks of EGR. Previous investigations of Nitrogen Enriched Air (NEA) combustion using nitrogen bottles showed up to 70% NOx reduction with modest 2% nitrogen enrichment. The investigation in this paper was performed with an ASM capable of delivering at least 3.5% NEA to a single cylinder spark ignited natural gas engine. Low Temperature Combustion (LTC) is one of the pathways to meet the mandatory ultra low NOx emissions levels set by regulatory agencies. In this study, a comparative assessment is made between natural gas combustion in standard air and 2% NEA. Enrichment beyond this level degraded engine performance in terms of power density, Brake Thermal Efficiency (BTE), and unburned hydrocarbon (UHC) emissions for a given equivalence ratio. The ignition timing was optimized to yield maximum brake torque for standard air and NEA. Subsequently, conventional spark ignition (SI) was replaced by laser ignition (LI) to extend lean ignition limit. Both ignition systems were studied under a wide operating range from ψ: 1.0 to the lean misfire limit. It was observed that with 2% NEA, for a similar fuel quantity, the equivalence ratio (Ψ) increases by 0.1 relative to standard air conditions. Analysis showed that lean burn operation along with NEA and alternative ignition source such as LI could pave the pathway for realizing lower NOx emissions with a slight penalty in BTE.
Sponsorship	Internal Combustion Engine Division
Starting Page	21
Ending Page	30
Page Count	10
File Format	PDF
ISBN	9780791843406
DOI	10.1115/ICES2009-76054
e-ISBN	9780791838433
Conference Proceedings	ASME 2009 Internal Combustion Engine Division Spring Technical Conference
Language	English
Publisher Date	2009-05-03
Publisher Place	Milwaukee, Wisconsin, USA
Access Restriction	Subscribed
Subject Keyword	Power density Membranes Torque Gas engines Ignition Combustion Separation (technology) Nitrogen Fuels Engines Emissions Exhaust gas recirculation Lasers Nitrogen oxides Thermal efficiency Brakes Ignition systems Natural gas Cylinders Low temperature
Content Type	Text
Resource Type	Article

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NOx Emissions Reduction Using Air Separation Membranes for Different Loads in Gas-Fired Engines

Air Separation Membranes: An Alternative to EGR in Large Bore Natural Gas Engines

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Air Separation Membranes: An Alternative to EGR in Large Bore Natural Gas Engines

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