The gas turbine compressor is a component that operates under heavy demand. If compressor efficiency is affected, it will consume more energy to compress the gas that is delivered to the turbine and the overall net power output and efficiency of the cycle decreases. The compressor is the first component of the cycle and therefore its effects will carry over to the rest of the cycle.
The turbine efficiency is defined as the ratio between the actual power produced in the turbine over the power that would be produced in an ideal turbine. A decrease in efficiency means that the overall net power output of the cycle decreases (and heat rate increases).
Including the turbine and compressor efficiency in the list of Power Plant Performance Parameters to evaluate should be a priority in any power generation project that uses gas turbines.
The “PTC22 – Performance Test Code on Gas Turbines” and ISO2314 – Gas Turbines Acceptance Tests are the relevant protocols used by TGPS to determine the performance of gas turbines.
Control systems need an accurate measurement of gas turbine exhaust to maintain a safe operation and to mitigate the possibilities of “overfiring” or “underfiring” in the combustion chamber. TGPS can provide high precision instrumentation to measure this parameter and reliable standards to calibrate site instrumentation. Both conditions affect the financial performance of power plants.
A higher exhaust temperature could be a symptom pointing to compressor or turbine inefficiencies. TGPS can perform a diagnostic analysis to identify underlying causes for an unexpected gas turbine exhaust temperature or flow variances.
Gas turbine exhaust flow characteristics have added importance when it is used as heat input to a steam cycle. The accurate measurement of mass flow and temperature are needed in order to estimate the performance of the HRSG and the steam cycle.
Using mobile high precision equipment TGPS can measure the levels of combustion products such as oxygen, carbon dioxide, carbon monoxide, nitrogen, sulfur dioxide, sulfur trioxitde, nitric oxide, nitrogen dioxide, hydrogen sulfide, and hydrocarbons. Testing is conducted in accordance with ASME PTC19.10 – Flue and Exhaust Gas Analyses and all EPA applicable protocols.
Noise emissions are accurately measured to ensure power plant noise emissions are compliant with local and contractual noise regulations. For most power plants, the major noise sources during operation are the air-cooled condenser or cooling tower (due to the fans), the gas and steam turbine, and the heat recovery steam generator (HRSG).
TGPS follows the guidelines set by ASME PTC36 – Measurement of Industrial Sound and ISO 10494 – Measurement of emitted Airborne noise for GT’s for the measurement of airborne sound emissions from stationary sound sources and facilities.