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The purpose of this research effort was to provide PG&E's Gas Supply Business Units with a basis for establishing the most cost effective strategies for meeting projected Federal and California NOx emission standards for gas compressor stations. The effort focused on field demonstration and evaluation testing of the most promising NOx retrofit control technologies for the Clark HBA-8T engine. The effort evaluated several alternative ignition system, fuel valve and turbocharger technologies. Ignition system alternatives included both multiple spark discharge systems and screw-in pre-combustion chambers. Turbocharger technologies included a re-aeroed Clark turbocharger and a re-aeroed Cooper ET-18 turbocharger. Alternative components were evaluated both in series and in combination with each other. Testing alternative retrofit components enabled PG&E to evaluate the performance and risks of competing compliance strategies. The paper presents field emission data collected for various component technologies. Data were collected at full-load operating conditions and emissions were sampled simultaneously at the exhaust stack.
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