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Research Papers: Air Emissions From Fossil Fuel Combustion

Normal Heptane-Diesel Combustion and Odorous Emissions in Direct Injection Diesel Engines

[+] Author and Article Information
Murari Mohon Roy

Department of Mechanical Engineering,  Rajshahi University of Engineering & Technology (RUET), Rajshahi 6204, Bangladeshmmroy5767@yahoo.com

J. Energy Resour. Technol 130(1), 011101 (Jan 25, 2008) (8 pages) doi:10.1115/1.2824295 History: Received December 03, 2006; Revised August 14, 2007; Published January 25, 2008

This study investigated normal heptane (N-heptane)-diesel combustion and odorous emissions in a direct injection diesel engine during and after engine warmup at idling. The odor is a little worse with N-heptane and blends than that of diesel fuel due to overleaning of the mixture. In addition, formaldehyde (HCHO) and total hydrocarbon (THC) in the exhaust increase with increasing N-heptane content. However, 50% and 100% N-heptane showed lower eye irritation than neat diesel fuel. Due to low boiling point of N-heptane, adhering fuel on the combustion chamber wall is small and as a single-component C7 fuel, relatively high volatile components present in the exhaust are low. This may cause lower eye irritation. On the contrary, bulk in-cylinder gas temperature is lower and ignition delay significantly increases for 50% and 100% N-heptane due to the low boiling point, high latent heat of evaporation, and low bulk modulus of compressibility of N-heptane than standard diesel fuel. This longer ignition delay and lower bulk in-cylinder gas temperature of N-heptane blends deteriorate exhaust odor and emissions of HCHO and THC.

Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of the experimental system

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Figure 2

Relationship between odor rating and eye irritation time

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Figure 3

Relationship between odor rating and HCHO concentration

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Figure 4

Odor rating of N-heptane blends at different injection timings

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Figure 5

Eye irritation time of N-heptane blends at different injection timings

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Figure 6

HCHO emissions of N-heptane blends at different injection timings

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Figure 7

THC emissions of N-heptane blends at different injection timings

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Figure 8

Gas chromatogram of the exhausts of N-heptane blends at 10deg BTDC injection timing after warmup

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Figure 9

Combustion pressure of N-heptane blends at 10deg BTDC injection timing

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Figure 10

Bulk in-cylinder gas temperature of N-heptane blends at 10deg BTDC injection timing

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Figure 11

Ignition delay of N-heptane blends at 10deg BTDC injection timing

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Figure 12

Combustion pressure of N-heptane blends at different injection timings after warmup

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Figure 13

Bulk in-cylinder gas temperature of N-heptane blends at different injection timings after warmup

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Figure 14

Combustion pressure with heat release of N-heptane blends at 10deg BTDC injection timing after warmup

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Figure 15

Ignition delay of N-heptane blends at different injection timings after warmup

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