Water injection effects on the performance and emission characteristics of a CI engine operating with biodiesel

Abstract

Biodiesel is one of the most promising renewable, alternative and environmentally friendly biofuels that can be used in diesel engine without any need for any modification in the engine. However, researchers have reported that the engines running with biodiesel emit NOx in higher concentrations. To address this problem, in the present study an experimental investigation has been carried out on the combustion, performance and emission characteristics of a compression ignition (CI) engine running with biodiesel under steady state conditions with a novel NOx reducing mechanism involving a water injections system. The experimental work has been conducted on a four-cylinder, fourstroke, direct injection (DI) as well as turbocharged diesel engine. In this investigation, biodiesel (produced from the rapeseed oil by transesterfication process) has been used.During the experiments the in-cylinder pressure, specific fuel consumption, water injection flow rate, fuel flow rate and exhaust emission (NOx, CO, CO 2 and THC) were measured. The experimental results clearly indicate that water injection at a rate of 3kg/h results in the reduction of NOx emission by about 50% without causing any significant change in the specific fuel consumption. Furthermore, the water injection in the intake manifold has little effect on the in-cylinder pressure and heat release rate of the CI engine under different operating conditions. 2

LHV predication models and LHV effect on the performance of CI engine running with biodiesel blends

“…In order to acquire accurate and repeatable engine test data for the engine combustion and performance characteristics, the engine test bed was instrumented with speed sensors, fuel flow metres and in-line torque meter. monitored by CADETV12 software [27]. The measuring range and accuracy of these instruments are presented in Table 4.…”

Effect of Syngas Moisture Content on the Emissions of Micro-Gas Turbine Fueled with Syngas/LPG in Dual Fuel Mode

“…This process decreases the flame temperature in the combustor which has negatively influences on formation of nitrogen oxides emissions. Moreover, the steam existence in the combustion chamber effects on the thermo/physical properties of the water vapor which effects on the heat transfer coefficient of the gas mixture and assists the heat transfer through the walls of the combustion chamber [11]. The results of syngas2 combustion showed higher nitrogen oxides emissions compared to syngas1.…”

Analysis of Selected Toxic Components in the Exhaust Gases of a CI Engine Supplied with Water-Fuel Emulsion

“…It must be noted, however, that the water-fuel emulsion is not a homogeneous mixture but a suspension. It therefore tends to delaminate over time [11,21]. While using water-fuel emulsion as fuel to power the engine, the gradual disappearance of the original microscopic structure and increase the size of the droplets of water in the diesel fuel must be taken into account [11,21].…”

“…While using water-fuel emulsion as fuel to power the engine, the gradual disappearance of the original microscopic structure and increase the size of the droplets of water in the diesel fuel must be taken into account [11,21]. Water-fuel emulsions can be divided into two groups: non-stabilized and stabilized [11,21]. Stabilized emulsions are prepared in the vehicle, just before fuel is injected into the engine.…”