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RESEARCH PAPERS

Charcoal-Adsorption, Water-Washing, and Air-Dilution Systems to Reduce Diesel Emissions With Special Emphasis on Odor Reduction

[+] Author and Article Information
Murari Mohon Roy

Department of Mechanical Engineering, Rajshahi University of Engineering & Technology, Rajshahi-6204, Bangladeshmmroy5767@yahoo.com

J. Energy Resour. Technol 129(4), 338-347 (Feb 28, 2007) (10 pages) doi:10.1115/1.2794769 History: Received January 24, 2006; Revised February 28, 2007

Direct injection (DI) diesel engines emit a far more disagreeable exhaust odor than gasoline engines, especially at low temperatures and at idling. There is no proper system of odor reduction in these conditions in DI diesel engines. This study investigated a charcoal-adsorption system to reduce exhaust emissions including odor in a DI diesel engine at idling under no load operations, where exhaust temperatures are low. Low temperature exhaust gas is passed through a charcoal adsorber. Charcoal has the property of adsorbing odorous gas components. Here odor is reduced more than 0.5 points, a significant odor reduction depending on the engine and adsorber conditions. Exhaust noise, nitrogen oxides (NOx), and eye irritation are also significantly reduced with the system. This study further investigated water-washing system for odor reduction in DI diesel engines at low exhaust temperature conditions. Exhaust gas is passed through the water in the water tank of the system. Aldehydes, organic acids, and other oxygenated components, which are the main odorous components in exhaust gases, are dissolved in water reducing exhaust odor significantly. Eye irritation of exhaust gases is also significantly reduced. The water-washing system not only reduces the odor and eye irritation but also carbon dioxide (CO2), carbon monoxide (CO), NOx, and smoke are reduced more than 20–30%. The sound level of exhaust gases is also reduced 1015dB with this system. Air dilution is also attempted in this study for odor reduction where a large amount of fresh air is mixed with exhaust gases. Here dilution ratio of 5 is used. Air dilution alone can reduce odor about 0.5 points. However, odor about 1.5–1.6 points (about 60–65%) can be reduced when air dilution is used in combination with charcoal-adsorber and water-washing system, and odor level is lowered below level 2, which is acceptable for all human beings.

Copyright © 2007 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

Total attachment for the odor reduction strategy

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Figure 3

Odor-pH correlation

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Figure 4

Odor rating without and with different diameter charcoal adsorbers

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Figure 5

Odor rating without and with different length charcoal adsorbers

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Figure 6

Noise level without and with charcoal adsorber

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Figure 7

Eye irritation time without and with charcoal adsorber

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Figure 8

Emission of CO2, CO, and NOx without and with charcoal adsorber

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Figure 9

Odor rating without and with water-washing System 1 at different heights of water column

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Figure 10

Odor rating without and with water-washing Systems 1 and 2 at different water volumes

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Figure 11

Eye irritation time without and with water-washing system

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Figure 12

Noise level without and with water-washing system

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Figure 13

Emission of CO2, CO, NOx, and smoke without and with water-washing system

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Figure 14

Odor rating without and with combined system

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Figure 15

Noise level without and with combined system

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Figure 16

Eye irritation time without and with combined system

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Figure 17

Emission of CO2, CO, and NOx without and with combined system

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Figure 18

Odor rating without and with various attachments

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Figure 19

Emission of CO2, CO, and NOx without and with total attachment

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Figure 20

Backpressure and fuel consumption without and with different systems

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