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An Investigation on the Regeneration of Lean NOx Trap Using Dimethyl ether
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
The ever-stringent emission regulations are a major challenge for the diesel fueled automotive industry. The application of alternative fuels and advanced after-treatment technologies is considered as a promising way to reduce exhaust emission from compression ignition (CI) engines. Using dimethyl ether (DME) as an alternative fuel has been extensively studied by many researchers and automotive manufactures since DME has demonstrated enormous potential in terms of emission reduction, such as low NOx and CO emissions, and soot and sulfur free combustion. However, the effects of employing DME in a lean NOx trap (LNT) based after-treatment system have not been fully investigated yet. In this work, an investigation of long breathing LNT with DME as a reductant is conducted on a heated after-treatment flow bench under simulated engine exhaust like conditions to gain an insight into using DME as a reductant for the LNT. Furthermore, the LNT regeneration performance with DME is compared with ethanol, n-butanol and diesel. The LNT regeneration performance is analysed in terms of NOx conversion and by-product formation (e.g. NH3 & N2O) for different reductant types. The premise of the present study is to demonstrate the potential of DME for ultra-low NOx emissions using in-cylinder NOx reduction techniques and after-treatment systems.