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c) 10.0~16.0 inch W.C. for fired heat recovery steam generators d) 2.0~7.5 inch W.C. incremental loss for SCR's and CO pollution control systems. 2.1.5 FuelRequirements The choice of fuels for your application are generally dictated by the type, the security and the cost of fuels available locally for your facility. When clean-burning natural gas is available in adequate quantities and inexpensively, it is the logical choice for a gas turbine. However, costly and power-consuming gas compressors may be required to raise the gas pressure to adequate levels. In general gas turbines operating on natural gas fuels have better power output and better heat rates than those operating on liquid fuels, and usually less maintenance costs. Distillate fuel or No. 2 fuel oil or their variations are frequently less-expensive than natural gas, but do not burn as cleanly and may decrease the time between overhauls of the gas turbine. These liquid fuels are frequently used when a local gas supply does not exist, or if the local gas supply is intermittent, or if the gas supply contract is cheaper for interruptible service, or for startup/shutdown purposes for heavy fuel oil-fired plants. On-site liquid fuel storage, filtration and pumping/unloading equipment will usually be required. If an emergency power plant is being considered, which is required to operate in the event of a main power supply failure, the power plant would be designed to operate solely on a liquid fuel, since the fuel can be readily stored at site ensuring it's availability when required. The most popular fuel for these emergency power plants would be Distillate or No. 2 fuel. Heavy fuel oils or residual oils are generally inexpensive, and when available locally can be used in heavy duty industrial gas turbines. In addition to the fuel storage and pumping equipment, a considerable investment in fuel treatment systems (chemical injection and washing), heating and waste treatment systems will also be required. Due to the high ash content of these fuels, the turbine firing temperature is usually lowered (i.e. the normal rated power and efficiency is much lower than a gas-fired or No. 2 fired machine) and water washing of the turbine section is required very frequently (sometimes on-line once a day plus more vigorous off-line washing once per weekend) in order to maintain a tolerable level of performance. UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 7PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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