For various reasons many operators choose to buy low emissions gas turbine(s). These are also called
DLE (Dry Low Emissions) or DLN (Dry Low NOx) gas turbine turbines. Following are the reasons given:
• Low NOx emission requirement specified by the local authorities,
• Lower overall emissions expectations by the local regulators.
DLE / DLN gas turbine suppliers typically quote low NOx limit of 25 ppm or lower. Nitrous oxide are
formed due to high temperature spots in the combustor. Low NOx emissions are achieved by ensuring
that the gaseous fuel and air are properly mixed for uniform temperature in the combustion chamber
thus prevent or reduce formation of various nitrous oxide