Effect of steam injection on nox emissions and performance of a single cylinder diesel engine fuelled with soy methyl ester

Abstract

Biodiesel attracts most of the researchers and automotive industries in recent years as an alternative fuel for diesel engines, because of its better lubricity property, higher cetane number, and less greenhouse gas emissions. The use of bio diesel leads to reduction in hydro carbons, carbon monoxide, and particulate matter, but increase in NO x emissions. Increase in biodiesel blends in standard diesel leads to increase in NO x emission. In this study, an attempt is made to reduce the NO x emissions of a diesel engine fueled with pure soy methyl ester (B100) with low pressure steam injection. Experiments were carried out and studied for both standard diesel and pure biodiesel of soy methyl ester with steam injection ratio of 5, 10, and 15% on mass ratio basis of air in the inlet manifold. The present study has shown that around 30% reduction in NO x can be achieved for the steam injection rate of 10% and considerable reduction for all other steam injection rates when compared to standard diesel and B100. It is also observed that steam injection having significant impact on reduction of other emissions such as HC, CO, and CO 2. The study also noted marginal improvement in the engine brake power, brake thermal efficiency and reduction in specific fuel consumption at part loads and minor increase during peak load operation for the low pressure steam injection on B100.

The effect of microalgae biodiesel on combustion, performance and emission characteristics of a diesel power generator

“…The NO x emissions increased compared to diesel when blended fuel and biodiesel were used except for the fact that there was a slight decrease in blended fuel compared to diesel at 10.2 kW. In addition, this increase became more apparent with the increase in the load, as found in other studies [21]. For example, under 3.6 kW load conditions, NO x turned out to be 1% and 5.5% more in use of blended fuel and biodiesel according to diesel, respectively, while the change in NO x was found at the rate of 1.3-0.5% and 9.2-4.5% for blended fuel and biodiesel when the load was increased to 7 kW and 10.2 kW, respectively.…”

Numerical analysis of injection parameters influence on diesel engine performances and emissions correlated by maximum in-cylinder pressure

“…According to a previous work presented by the authors the numerical code has been tuned in order to validate successfully CO, CO 2 , and O 2 concentrations. It has been shown that, for the five loads, measured values of [O 2 ], [CO] and [CO 2 ] at the exhaust valve opening lies perfectly with those obtained by kiva3v2[19]. Thus, the tabulated chemistry used led to a suitable prediction of O 2 , CO and CO 2 concentrations in the exhaust.…”

“…2-Maximal in-cylinder pressure rather than temperature as proposed in [19]. In fact, maximum value of the averaged in-cylinder pressure, like temperature, is a thermodynamic function but much easier to measure in addition.…”

“…Figure3illustrates confrontation between calculated values of [O 2 ], [CO] and [CO 2 ] and those measured at the exhaust valve opening for both 80% and full load. It can be noted that further results and information are presented in[19]. The injection parameters related for each load can be shown in table(2).…”

“…Physical parameters related to the dynamics of the two-phase jet as well as the chemical parameters occurring at a sub-mesh scale are treated by sub-models from an in-like calculation cell mesh scale [11] - [16]. NOx emitted by conventional diesel [17] and biodiesel fueled engines [18,19] remains the main chemical pollutant targed by reserchers in the world.…”