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Electrical Generating Equipment - Dual Fuel Engines

Control measures to date are primarily directed at limiting NOx and CO emissions since these are the primary pollutants from these engines. From a NOx control viewpoint, the most important distinction between different engine models and types of reciprocating engines is whether they are rich-burn or lean-burn. Rich-burn engines have an air-to-fuel ratio operating range that is near stoichiometric or stoichiometric fuel-rich and as a result the exhaust gas has little or no excess oxygen. A lean-burn engine has an air-to-fuel operating range that is greater than stoichiometric fuel-lean; therefore, the exhaust from these engines is characterized by medium to high levels of O2. The most common NOx control technique for diesel and dual fuel engines focuses on modifying the combustion process. However, selective catalytic reduction (SCR) and nonselective catalytic reduction (NSCR), which are post-combustion techniques, are also available. These systems operate in a similar manner to those described under Natural Gas Engines.