when the fuel temperature increases and the engine is operated without EGR, the brake specific fuel consumption (bsfc) decreases, engine efficiency increases and NOx emission slightly decreases. However, when EGR is used while fuel temperature is increased, the bsfc and engine efficiency is independent of fuel temperature while NOx slightly increases.
NOx emissions mainly seen when we use biodiesel , in my recent project I work with cocus nucifera oil and its biodiesel production , hence we noticed greater NOx emissions than normal diesel . It is because of its more oxygen rich nature of biofuel . In CI engine temperature is high hence the chance for formation of NOx is high due to oxygenated biofuel.
Dear Upendra,
Lot of research studies confirms that when 10% or even higher of flue gas was recycled, it was observed that almost no NOx formed thermodynamically under all studied conditions. The higher percentages of biomass are used in co-firing boilers, the smaller amount of NOx and SOx formations seen. Excess air temperature and fuel ratio studies shows that air staging has, however, a negative effect on N2O emissions. Even though the trends show a very small reduction in the NOx level as temperature increases in nonstaged combustion, the effect of temperature is not significant for NOx and CxHy, neither in staged air combustion or nonstaged combustion, while it has a great influence on the N2O and CO emissions, with decreasing levels with increasing temperature.
If oxygen rich is more in bio-fuel like diesel, chances of Nox emission is more. Otherwise, increasing in fuel temperature Nox emission slightly decreases.
Hope it work out for you.
Ashish
This is similar to asking what is the value of life and expecting a simple, or even numerical, answer. There is none. It depends on what fuel you are using (coal, wood, diesel, gasoline, biogas, alcohols, ...), in what type of device (household stove, coal-fired power plant, diesel engine, etc.), with what type of exhaust aftertreatment, and under what conditions.
As the temperature increase the NOx formation increased also. So, to decrease the NOx formation during the reaction we work in tuning the reaction
Depends upon your usage criteria.
if you are to use biodiesel or any oxygen enriched fuels, then NOx emission can be seen increasing with temperature and PM reduces slightly.
but in case of diesel fuel, increase in temperature will lead to reduction of NOx (slightly).
According my research NOX emission increased with increasing fuel temperature but lowest at 500 K temperature.
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