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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Gaseous System Technical Information Injector Operation Model C30 The Model C30 MicroTurbine utilizes three pilot injector solenoids (1, 2 and 3), and a single premix solenoid to control fuel flow to the engine. Each injector delivers fuel from two points of entry – directly from the pilot tube, or through the premix tube. The pilot tubes supply fuel directly into the combustion chamber, mixing with air from the recuperator. The premix tubes utilize air from the recuperator through swirl holes in the injector, prior to entering the combustion chamber. Injector operation changes at different power levels (ISO corrected generator power). Power levels for each injector switch point decrease by approximately 2 kW due to hysterisis effects during offloading. • Below 7 kW, the MicroTurbine operates with a single pilot injector. • From 7 kW to 22 kW, all three pilot injectors are switched on. • Above 22 kW, all three pilot solenoids are turned off, and the premix solenoid is switched on. To increase flame stability with medium or low BTU content fuels, the sequencing of the fuel solenoids changes based on the BTU content value selected. For a BTU content setting of medium, the system will light on three pilot injectors and switch to premix mode as noted above. Medium BTU systems will never operate in single pilot mode. For a BTU content setting of low, the system will light and always operate in premix mode. The pilot solenoids will never be used. Refer to the BTU Content Switch section for information on this setting. Model C60 The Model C60 MicroTurbine utilizes five injector solenoids, located on the fuel manifold for controlling fuel flow into six injector ports of the engine. Injectors 1 and 2 are always on and are controlled by a single solenoid. Injectors 3 thru 6 are operated by separately controlled solenoids. The C60 always operates in premix mode. Injector operation changes at different power levels (ISO corrected generator power). Power levels for each injector switch point decrease by approximately 3 kW due to hysterisis effects during offloading. • The MicroTurbine initially lights using injectors 1 and 2 (one solenoid operates both injectors). • Above 15 kW, third injector turns on (turns off at ~12 kW). • Above 26 kW, fourth injector turns on (turns off at ~23 kW). • Above 43 kW, fifth injector turns on (turns off at ~40 kW). • Above 54 kW, sixth injector turns on, and all six are in operation (turns off at ~51 kW). 410037-001 Rev B (January 2006) Page 7 of 15 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. Pilot C30 Injector Premix Air Mix Swirl Holes Premix Air Mix Entrance C60 InjectorPDF Image | Technical Reference Gaseous System Technical Information
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