Amr Ibrahim Energy Fuels23, — Revised Manuscript Received August 20, The use of an exhaust gas recirculation EGR strategy is economically capable of satisfying the increasingly restricted emission standards. In this paper, the effects of change of compression ratio rc on the performance and NO emissions of a natural gas SI engine were experimentally investigated for different EGR dilution conditions.
A bench tests were carried out on an YC6J diesel engine fueled with B20 marine biodiesel.
HC decreased by The soot emissions decreased by In order to investigate the effect of variable valve timing on engine power performance, fuel economy performance and emission performance quantitatively, proceed to optimize it, a high speed diese Specific Fuel Consumption, quantity of NOx and Soot, mass of fresh charge were calculated by 3-D CFD method l engine contains variable valve timing system VVT was researched.
The effective power, at 6 speeds conditions which valve timing parameters were modulated. A method of calculating CRG was suggested.
The results indicate that exhaust advance angle has a little impact on sweep and emission performance, but a big impact on ventilation losses.
The optimum exhaust advance angle should be increased as engine speed rises. Increasing intake lag angle in low engine speed could increase coefficient of charge, thereby increase power performance and fuel economy performance.
Comprehensive performance could be increased by decreasing intake delay angle under high speed. Lots of heat energy waste with the exhaust gas when the engine is running.
If this part of waste heat can be recovered, the energy efficiency will be improved. Thus plenty of energy can be saved and the global warming also can be reduced. In this paper, the organic Rankine cycle whose working fluid was Rfa was studied.
It was adopted to recover the gasoline engine waste heat. The mathematical model of the organic Rankine cycle was built up in Matlab to search the optimized working condition.
The pinch analysis method was used to analyze the outlet temperature of the exhaust gas. The results indicate that organic Rankine cycle is a good way to recover the gasoline engine waste heat, especially in the high load conditions. The temperature of the exhaust gas can be apparently decreased.
Urea-SCR catalytic converter can effectively reduce the NOx emission of diesel engines, but meanwhile catalytic converter will cause some pressure loss in the exhaust system, which has negative influences on the engine performances. In this paper, the method of theoretical analysis calculated the pressure loss of the SCR catalytic converter, and designing a new type of exhaust gas pipe.
Through the test to meet the design requirements,the results can provide a reference for optimum design of SCR catalytic converters and assembling.
Currently, fuel-saving technologies in the use of vehicles have been a wide range of applications, and develop towards the trend of diversification.The effects of DME fuel delivery advance timing and EGR ratio on the engine combustion, power, fuel economy, and emissions were studied experimentally.
EGR strategy was designed and tested for the DME engine NOx emission to meet Euro IV and V regulation. Changes Effect on Oil Effect on Fuel Economy Moderate EGR w/ SCR replacing Heavy EGR Reduced soot level at drain from • This requires a carefully balanced lubricant formulation with an optimized combination of additive components, viscosity modifiers and base oils.
In recent publications, the authors have shown that the exhaust gas fuel reforming technique has the potential to provide a way of controlling diesel engine exhaust emissions.
The technology involves the incorporation of a reformer in the engine exhaust gas recirculation (EGR) loop. Fresh fuel is.
For the RD optimized test, the efficiency improvement was high enough to compensate the lower volumetric heating value, finally resulting in % volumetric fuel consumption benefit with respect to . Clean Diesel Glossary.
Common Rail Fuel Injection. Low pressure EGR systems are used for retrofit applications in conjunction with high efficiency DPFs.
In a low pressure EGR system, the recirculated exhaust is taken from downstream of the high efficiency DPF. EGR reduces the emissions of nitrogen oxides with a low penalty in fuel consumption. The increasingly hard regulations on emissions put high pressure on the manufacturers to improve these systems.