RESULTS AND DISCUSSION: Experiments were conducted at a
constant speed and by varying the loads. Compare the emission and performance
of blended, biodiesel and pure diesel oil.
1.1Carbon mono oxide emission: The variation of carbon mono oxide emission with
respect to load is shown in Fig1.1. In this figure we observed that the engine
emitted more carbon mono oxide for pure diesel as compared to biodiesel blends
at all loading conditions. The concentration of carbon monoxide is decreases
for the blends B20 and B100 for all loading conditions.
mono oxide with varying load for Diesel, B100 & B20 blends.
1.2 Carbon dioxide emission: Figure
1.2 shows the variation in carbon dioxide for diesel and biodiesel blend B20
and B100. When the loads are increased the diesel engine emitted more Carbon
dioxide in comparison to blend diesel fuel. Carbon dioxide emission
is due to incomplete combustion of fuel and it is basically depends on engine
temperature, and Air fuel.
Fig 1.2 Carbon
dioxide with varying load for Diesel, B100& B20 blends.
1.3 Nitrogen Oxide Emission:
1.3 shows emission of nitrogen oxide of pure diesel engine and blend diesel B20
and B100.The NOx emission for blend B20 and B100 is more as compared to pure
Diesel engine increasing trend with respect to load. The reason behind the
situation higher average gas temperature and residence time at higher load
conditions. A reduction in the emission for all getting after adding the
ignition improve blends as compared to optimum blend was noted.
Fig 1.3 NOx with
varying load for Diesel, B100 & B20 blends
1.4 Brake Specific Fuel Consumption: We observed that the brake specific fuel consumption is higher than that of diesel when the B20 and B100
blends are used in diesel engine. The brake specific fuel
consumption is an essential parameter by which compare the engines and
determine the fuel efficiency of engines.
Fig 1.4 brake specific fuel consumption variation with different
load for B20, B100,& diesel.
1.5 Brake thermal efficiency: The brake thermal efficiency
of B20 and B100 is decreasing when the blends were increasing. The brake
thermal efficiency of B20 and B100 is less than that of pure diesel fuel at
1500 rpm constant engine speed.
Fig 1.5 Brake thermal efficiency varying load for Diesel, B20 & B100
CONCLUSION: In this chapter concluded that the use of biodiesel
blends slightly increases the brake specific fuel consumption in comparison to
the diesel fuel at the same load condition. The
reason behind the situation is due to lower calorific value of bio diesel. The
CO and CO2 percentage of B20, B100 lower than diesel. This may result in lower
CO and CO2 emission with blend of biodiesel.
It has many advantage high biodegradability,
reduction in greenhouse gas emissions, non-sulphur emissions, non-particulate
matter pollutants, low toxicity, and excellent lubricate and is obtained from
renewable source like vegetable oils, animal fat etc. Finally it is concluded
that the biodiesel can be used as good alternative fuel in the Diesel engine without any change to the engine.