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NOx Emissions of Alternative Diesel Fuels: A Comparative Analysis of Biodiesel and FT Diesel

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This study explores the diesel injection and combustion processes in an effort to better
understand the differences in NOx emissions between biodiesel, Fischer-Tropsch (FT) diesel,
and their blends with a conventional diesel fuel. Emissions studies were performed with each
fuel at a variety of static fuel injection timing conditions in a single-cylinder DI diesel engine
with a mechanically controlled, in-line, pump-line-nozzle fuel injection system. The dynamic start
of injection (SOI) timing correlated well with bulk modulus measurements made on the fuel blends.
The high bulk modulus of soy-derived biodiesel blends produced an advance in SOI timing
compared to conventional diesel fuel of up to 1.1 crank angle degrees, and the lower bulk modulus
of the FT diesel produced a delay in SOI timing of up to 2.4 crank angle degrees. Compared to
conventional diesel fuel at high load, biodiesel fuel blends produced increases in NOx emissions
of 6-9% while FT fuels caused NOx emissions to decrease 21-22%. Shifts in fuel injection timing,
caused by bulk modulus differences, were largely responsible for the NOx increases, but pure FT
diesel produced lower NOx emissions than expected on the basis of SOI alone. Further analysis
showed that no trends were seen between NOx and either ignition delay or maximum cylinder
temperature, and only weak, or fuel-specific, relationships were seen between NOx and maximum
heat release rate and the timing of maximum heat release rate. The timing of the maximum
cylinder temperature, however, did produce a relationship with NOx emissions that was not
dependent on fuel type.

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Ketersediaan

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Informasi Detail

Judul Seri

Energy & Fuels

No. Panggil

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Penerbit

Washington, DC : American Chemical Society., 2005

Deskripsi Fisik

Energy & Fuels 2005, 19, 1484-1492

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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