Abstract
gas turbines are machines that work directly with ambient air, then anything that causes a change in the inlet air condition, effect on turbine efficiency. Relative humidity, Mean sea level and environment temperature have a direct effect on gas turbine efficiency.Generally, peak demand for electricity occurs during the summer time, that the output power of the gas turbine reaches its minimum value for high temperature of inlet air. This makes a lot of pressure on the power industry and to compensate for excess demand, there will always be a need for further investment of new plants. Research done on V94.2 turbines manufactured by Siemens and for pilot studies, thermo flow and GT Pro software was used.
Highlights
Reducing the maximum inlet temperature to the dew point or vapor saturation point temperature is fundamental limits and lower primary and operating costs is its benefits of these methods. b) In method of compression refrigeration, a radial or impact chiller is used to cooling compressor inlet air by a cooling coil or placing evaporator in air path
Primary cost and especially high operating cost and energy consumption is disadvantages of this method but independent from environmental condition is benefits of this method. c) To cool compressor inlet air, an absorption chiller with Liquid refrigerant has been used in absorption refrigeration method
To analyze efficiency improvement method using Thermo flow software, three different methods of evaporation, fog spray and compression and absorption refrigeration were selected
Summary
Turbine power output and efficiency factors include ambient air temperature, relative humidity, Mean sea level, inlet air pressure and fuel type that can decrease outlet power of gas turbine rather than design condition (ISO condition). inlet air temperature and Mean sea level of installation place have most effect on application parameters of turbine that mean sea level cannot be ignored and all outlet power enhancement methods and efficiency improvement Concentrated on inlet air cooling. comparing with new power plant construction costs, apply inlet air cooling methods are less expensive that cause outlet power of gas turbine become closer to nominal power and a significant portion of excess demand will be compensated. in more operating gas turbine, cooling inlet air is under consideration because it is an independence process. this method without any change or modification in main components of gas turbine and considering some technical point is applicable. Power enhancement and efficiency improvement of gas methods is mainly divided into three very general categories were a) power enhancement method by inlet air cooling b) efficiency improvement and power enhancement methods by using outlet hot gas c) saving energy methods first and second category except using outlet hot gas in absorption chillers for cooling inlet air, all methods need changes in combustion turbine cycle that need turbine design parameters and its thermodynamic conditions. Considering advantages of inlet air cooling methods [3], we technically and economically investigate evaporation, compression refrigeration, absorption refrigeration and fogging method [4, 5, 6] in efficiency improvement of V94.2 gas turbine using thermo flow and GT Pro software.
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