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c) Fuel Gas Compression Systems - When a natural gas fueled gas turbine is supplied with fuel at a pressure below that required for the manufacturer's fuel gas control system, then on-site compression will be required. Such gas compression equipment includes not only rotary or reciprocating compressors, but also cooling fans and/or inter-cooler and after-cooler water pumping systems. All this equipment is generally electric motor driven, and the power required must be obtained via an auxiliary transformer from within the powerplant itself. Thus, this will be an additional parasitic loss to the power plant. As a general rule, when required, fuel gas compression will be the largest parasitic loss for any installation. Several hundred horsepower is not an uncommon requirement for larger gas turbines. For illustration, on sketch SK01, the gas compressor load is 526 kW. This auxiliary load will change with the output power and the gas supply pressure, and will be maximum at the low ambient temperatures. If the gas transmission / supply system provides the natural gas at the required or at a higher pressure, then no on-site gas compression is required. d) Fuel Oil Pumps and Fuel Oil Systems - Gas turbines which include fuel oil systems may have the system main high-pressure pumps either shaft-driven or more frequently, electric motor-driven. Again, if the main fuel oil pump is driven from the gas turbine or a gearbox, the manufacturer will generally account for the parasitic loss when he calculates his generator performance, and it will have no further effect on the parasitic losses of the installation. If the main fuel oil pump is electric motor driven via an auxiliary transformer, the parasitic loss needs to be deducted from the gross power output of the generator. A fuel oil system will also generally include forwarding pumps to move fuel from the main storage tanks to a daytank, and a boost pump moving the fuel from the daytank to the inlet of the main high-pressure pump, plus frequently, tanker off-loading pumps. The power consumption for these devices should be included when calculating net power output. Some fuel oil systems may require heating due to elevated pour points or high levels of paraffin. Most heavy fuel oil systems will require heating and large fuel treatment systems to make the fuel suitable for combustion. The UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 14PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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