Analysis of the possibility of reducing unburned methane emissions in a dual fuel engine at low loads by using a throttle valve
Abstract
A significant problem of a dual fuel engine is the increase in emissions of unburned methane (CH4) at low loads due to deterioration of combustion caused by a high excess air coefficient (α). Experimental parameters of a dual fuel engine are presented, which showed a significant increase in CH4 emissions with a decrease in load. To reduce the value of α, the use of a throttle valve was examined. The working process of a dual fuel engine was simulated in the AVL FIRE and BOOST environment. The change in combustion process parameters and fuel efficiency with the decrease in α as the throttle valve was closed at a load of 25% were analyzed. Two versions of the dual fuel engine were considered: the standard one and the new one with smaller injector and combustion chamber of the gas engine. When α was reduced from 4.9 to 2.2 by closing the throttle valve, the indicated efficiency increased by 12…16.0 % and CH4 emissions decreased 10.2…11.7 times. The brake specific fuel consumption increased by 17.4% due to increased gas exchange losses.
About the Authors
Igor V. Maximov
MADI
Russian Federation
Russian Federation
postgraduate
Vladimir V. Sinyavsky
MADI
Russian Federation
Russian Federation
Candidate of Sciences (Technical), associate professor
Andrey V. Vakulenko
MADI
Russian Federation
Russian Federation
engineer
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Review
Рецензент: Матюхин Л.М., канд. техн. наук, доц., МАДИ
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