What is heat rate?

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Amount of heat energy needed to produce one unit of electrical energy.

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Purge time calculation on gas turbine?

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Purge times are calculated from many factors, including the air flow through the gas turbine's axial compressor during purging, air flow from zero speed to purge speed, and the volume of the exhaust--including heat recovery steam generator (HRSG; boiler); exhaust stack volume, any exhaust duct work between the turbine and HRSG and stack, etc. Some installations have a "bypass stack" that can be used when the gas turbine exhaust is not to be used to make steam. In this case the purge time is usually shorter. The accepted industry standard is to have three to five "exchanges" of air through the entire unit (axial compressor, turbine, exhaust/HRSG/stack) to ensure any combustible gases are purged before fuel/spark are admitted to the gas turbine. Some manufacturers have done some very creative things with "purging" recently because owners/operators have demanded shorter and shorter purge times. If you are having difficulty or more specific questions, we c...
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What is IBH?

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IBH is a way to decrease compressor efficiency and reduce mass flow through the compressor. Inlet bleed heat(IBH) takes compressor discharge air and routes it back to the inlet of the compressor. By taking compressor discharge air away from the combustion wrapper you reduce mass available to the combustor. Also introducing this very hot air into the turbine inlet raises the temperature of the air and decreases the efficiency of the compressor since warm dry air has less mass than cold damp air. All of this is typically done to reduce mass flow through the compressor at low load conditions to help control emissions. It also helps to decrease the formation of ice in cold climate areas, and lastly helps to provide compressor protection at low loads, again by reducing the efficiency of the compressor. Inlet bleed heat demand is typically a logrithmic function of IGV angle, although you would be advised to review application code for the particular unit you are familiar with. This descrip...
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