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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Fuel Requirements External Fuel Gas Compressor Life Excessive gaseous fuel temperatures or corrosive contaminants will cause early component failure. Sub-atmospheric inlet pressure to the compressor can also result in air leaking into the gas-fuel supply and the consequent risk of an explosive mixture. Additional information may be found in the Fuel Gas Compressor documentation (Capstone 512000 and 512001). Liquid Fuel Density and Viscosity Deviation of the liquid fuel density from the parameters noted within this document may result incorrect metering of the liquid fuel, and/or other fuel control issues. High fuel viscosity may result in increased heating of the fuel pump internal components, which may affect the fuel pump performance. High fuel viscosity may result in cold start problems due to its effect on fuel atomization, and may also increase emissions. Lower than specified fuel viscosity may result in increased internal leakage of the fuel pump, which may adversely affect the fuel metering accuracy, especially under low flow conditions. Liquid Fuel Pump Life Liquid fuel pump life may be adversely affected by the fuel viscosity, fuel lubricity, and fuel temperature, in addition to any contaminants in the fuel that are outside of the requirements detailed within this document. Water in Liquid Fuels Excessive water present in liquid fuels may result in freezing at cold temperatures that may result in fuel system malfunction and system shutdown. Excessive water may also result in biological growth in fuel system components, especially within the fuel filter. MicroTurbine (Engine) Evaluation Concerns The MicroTurbine (Engine) evaluation areas include the following items: Damage of MicroTurbine Hot End Components Due to their chemistry, some fuel contaminants (sulfur, for example) may lead to hot end component damage (combustor, and/or other components). Combustible Liquids in a Gaseous Fuel System The presence of liquids in a gaseous fuel, either from the fuel or from the fuel gas compressor lubricating oil, may result in MicroTurbine (engine) hardware damage. It is important to maintain the gaseous fuel at 10 °C (18 °F) above the dew point temperature throughout the fuel system. This includes up to and including the manifold. In addition, provisions must be made for purging the fuel system upon shutdown, and/or prior to startup, to prevent liquid ingress to the MicroTurbine. You may also refer to Figure 1, which shows the effect of Propane/N-Butane percent variation on the dew point for LPG fuel. Notice that a margin of 10 °C (18 °F) must be added to the dew point temperature noted in Figure 1. Surge Fuels with reduced volumetric heating values will reduce surge margin of the engine. This may result in unsteady operation of the MicroTurbine. 410002-001 Rev A (DRAFT) Page 21 of 31 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 equipment ratings, 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 Capstone MicroTurbine Fuel Requirements
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