Gas Engine Combustion Principles and Applications

Abstract

<div class="htmlview paragraph">Modern commercial dual fuel engines operating in gas mode has the same level of fuel efficiency as the diesel mode. The NOx emissions level is reduced ten fold and satisfies the most stringent European 1/2 TA-Luft regulation. THC emissions can be controlled by the oxidation-catalytic process. High efficiency low NOx emissions gas engine performance is achieved by the following:</div> <div class="htmlview paragraph"> <ul class="list disc"> <li class="list-item"><div class="htmlview paragraph">Same power cylinder components as the basic diesel.</div> </li> <li class="list-item"><div class="htmlview paragraph">Retarded timing together with short heat release duration by using Micropilot/Microcup designs.</div> </li> <li class="list-item"><div class="htmlview paragraph">Lean lambda of 2.0 to 2.2.</div> </li> <li class="list-item"><div class="htmlview paragraph">Minimal pilot fuel, 1% or less.</div> </li> <li class="list-item"><div class="htmlview paragraph">Centrally located ignition if practical.</div> </li> <li class="list-item"><div class="htmlview paragraph">Low air charge temperature at high load for high BMEP.</div> </li> <li class="list-item"><div class="htmlview paragraph">20-30% lower lambda at part load (compared to full load) achieved by compressed air bypass, skipfire, or variable geometry turbo.</div> </li> </ul> </div> <div class="htmlview paragraph">This paper provides only a qualitative treatise on gas engine combustion and the effects of fuel quality and engine design on combustion. Additional research is warranted.</div>