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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Liquid Fuel System Technical Information – Model C30 MicroTurbine System Operation Engine Start-up The MicroTurbine initiates a fuel line fill cycle at the beginning of the start sequence. Fuel supplied by the customer is cycled into the fuel lines from the fuel pump (and optional boost pump). The Liquid Fuel Controller (LFC) supplies voltage and current to the fuel pump. As individual injector lines fill, the manifold pressure rise-over-time is monitored to determine if the fuel line is full to the injector. If the pressure rate requirements are not satisfied, the unit issues a “16004 LF FAIL LINFIL” pressure-related fault. Fuel is introduced into the combustion chamber as the internal generator brings the MicroTurbine to ignition speed, and engine firing on the No. 1 injector occurs at the beginning of each sequence. When the Turbine Exit Temperature (TET) sensor reports an increase in temperature, the system is declared lit, and the MicroTurbine accelerates to full load. The engine start-up sequence is as follows: 1. The RFC is turned on. 2. The air-assist solenoid opens to provide air to the air-assist manifold from the RFC - until an ISO-corrected generator power level of approximately 7 kW. 3. The fuel shutoff solenoid and injector 1 solenoid open to allow fuel through injector 1. If air pressure feedback from the RFC does not reach commanded pressure at start-up, a “3029 RFC AIR ASSIST” fault is declared. The drain system includes a drain tank fuel-level float sensor to detect the amount of fuel present in the tank at all times and collects excess fuel during a “6006 FAIL TO LIGHT” fault. The tank is equipped with a float sensor to provide feedback to the operator as to the level of fuel in the tank. There are two levels: 1) Lower level (30% full) which triggers a warning fault if actuated, and 2) High level (80% full) which triggers a shutdown fault if actuated. The drain tank return pump returns excess fuel from the tank to an external fuel waste container during auto-prime, shutdown, and line filling operations (as a result of multiple fail-to-lights). Idle Operation The system is considered in “idle” state if the power level is 0 kW. During idle operation, the unit operates on only one injector. If the engine experiences a combustion flame-out/stability issue, the controller will use auto-relight logic to select the most stable injector for idle operation. Steady State The system is considered to be in “steady” state if it operates continuously at a power level greater than 0 kW, using at least a single injector. When the MicroTurbine reaches ambient- corrected generator power of 7kW, the system transitions from one injector to three-injector engine operation. The injector switch point varies with ambient conditions. When off-loading, the engine will switch back from three injector to single injector operation. In addition, air assist pressure/flow is utilized during steady state operation to atomize the fuel for combustion and to purge the fuel lines during system shutdown. Air is supplied from the BB-RFC through the air-assist solenoid during a start (and below 7 kW), and through engine compressor discharge pressure (PCD) during operation above the 7 kW power level. 410017-001 Rev C (February 2004) Page 3 of 12 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.PDF Image | Technical Reference Liquid Fuel System Technical Information – Model C30 MicroTurbine
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