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.
About Clean Diesel Clean Diesel Glossary Terms and definitions related to the new advanced diesel technologies that make engines cleaner, quieter and more powerful than ever before. New advanced diesel technologies have made these engines cleaner, quieter and more powerful than ever before.
Some of these revolutionary innovations include: Closed Crankcase Filters Closed crankcase filters are used to reduce emissions from crankcase breather tubes in most turbocharged aftercooled diesel engines by using a multi-stage filter designed to collect, coalesce, and return the emitted lube oil to the engine's sump.
For MY to heavy-duty diesel engines, crankcase PM emissions reductions provided by crankcase emission control technologies are about up to 25 percent of the tailpipe emission standards. Common Rail Fuel Injection An advanced fuel pump technology that is part of the new fuel control system in clean diesel engines.
By directly feeding the injectors from a single fuel pump, an electronic system can be incorporated which precisely controls the pressure and timing of fuel injection.
A more advanced and efficient common rail injection system is the Piezo Common Rail which, is currently being introduced in automotive applications. Diesel Oxidation Catalysts DOCs Like catalytic converters already used on all new gasoline vehicles, diesel oxidation catalysts DOCs cause chemical reactions to reduce emissions without being consumed and without any moving parts.
The catalysts reduce particulate emissions by as much as 50 percent, can reduce visible smoke, and can virtually eliminate the pungent odor of diesel exhaust.
The catalysts can reduce the invisible gaseous ozone-forming hydrocarbons by more than 70 percent and carbon monoxide emissions by as much as 90 percent. DOCs have been equipped on overoff-road diesel engines worldwide for over 30 years, and on over 1. DOCs can be installed on new vehicles or can be retrofitted on vehicles already in-use.
Diesel Particulate Traps A high efficiency diesel particulate trap removes PM in diesel exhaust by filtering exhaust from the engine.
The filter systems can reduce PM emissions by 80 to greater than 90 percent. Electronic Controls A computer controls mechanical switches that allow precise amounts of fuel to flow from the injector into the cylinder.
Flow-Through Filters Flow-through filter technology is a relatively new method of reducing diesel PM emissions that unlike a high efficiency DPF, does not physically "trap" and accumulate PM. Instead, exhaust flows typically through a catalyzed wire mesh or a sintered metal sheet that includes a torturous flow path, giving rise to turbulent flow conditions.
Any particles that are not oxidized within the flow-through filter flow out with the rest of the exhaust. So far, there have been limited commercial use of the flow-through filters but there is an increasing interest in this technology due to its ability to significantly reduce PM emissions from older, "dirtier" diesel engines.
Flow-through systems are capable of achieving PM reduction of about 30 to 70 percent. Glow Plugs Typically comprises a heating coil in a metal tube closed at one end and filled with electrically insulating ceramic powder. These plugs help quickly start advanced engines.
NOx adsorber technology has made significant progress and is currently being optimized for diesel engine emission control. Reductions in engine out NOx emissions of as high as 90 percent have been demonstrated and it appears possible to develop the system into a functional and durable NOx control system for diesel exhaust.
Selective Catalytic Reduction Selective Catalytic Reduction SCR is one of the most cost-effective and fuel-efficient vehicle emissions control technologies available to reduce diesel engine emissions. Selective catalytic reduction SCR systems use a wash-coated or homogeneous extruded catalyst and a chemical reagent to convert NOx to molecular nitrogen and oxygen in the exhaust stream.
In mobile source applications, an aqueous urea solution is usually the preferred reductant.Apr 27, · Development of Fuel Injection System, Air/EGR Path and Emission Af-tertreatment Abstract Diesel com bustion can be optimized sufficiently by more comprehensive control.
The second effect is a more stable combustion at the very high EGR.
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. the increasing price and shortage of fossil fuel and to the more stringent emission regulations .
As tigated the effect of EGR on the oxidative reactivity of diesel engine soot in a common-rail DI light-duty Effects of exhaust gas recirculation rate and ambient gas temperature Proc.
IMechE Vol. Part D: J. Automobile Engineering. For smaller engines—the company’s D5 and D8 models—cooled exhaust gas recirculation (EGR) is being replaced with uncooled EGR to deliver highly effective heat management.
In addition, it will help reduce complexity of the engine, as will the use of a fixed turbo instead of a variable geometry turbo. external exhaust gas recirculation (cEGR) and cylinder deactivation (CDA) were evaluated.
The base engine was a production gasoline was used to simulate the effect on BSFC of increasing compression Potential Fuel Economy Improvements from the Implementation of . emission, exhaust gas recirculation (EGR) used to reduce formation nitrogen oxide (NOx), external or internal EGR system works by recalculating a portion Thermal Effect: EGR contains water and CO2, Retard in fuel injection timing & EGR the power is.