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Title: Exhaust Emission Reduction For In-Use Engines
Author: C. F. Wilke
Source: American Gas Association 1983
Year Published: 1983
Abstract: Dresser Clarks exhaust emission reduction program for retrofitting existing field engines has been directed toward the TLA and TCV Series engines (See Figures 1,2, and 3). These units are two cycle, spark ignited, gas engines with varying degrees of turbocharging. The TLA Series uses either interal or external scavenging air coolers, while the TCV Series utilizes only the external scavenging air cooler. (There is over 2.2 million brake horsepower being produced by TLA and TCV Series engines in the field.) The formation of oxides of nitrogen during the combustion temperature and combustion cycle of a reciprocating engine is primarily a function of combustion time. Operating an engine with a lean air/fuel ratio results in lower combustion temperatures and subsequently lower NOx formation however, lean mixtures are difficult to ignite and burn slowly, resulting in misfiring and unsatisfactory engine performance. A reliable high energy ignition source capable of igniting the fuel lean mixture will permit operation in a region of reduced NOx formation. Dresser Clark has designed a power cyUnder head equipped with two torch chambers to satisfy these requirements.

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