Thermoenvironomic evaluation of simple, intercooled, STIG, and ISTIG cycles

Abstract

Summary Low‐technology cycle modifications available for improving gas turbine performance are still largely unexploited. Among those proven modifications, steam injection is found to be the most effective in boosting both the output capacity and thermal efficiency while reducing NOx emissions. It further improves part load performance under varying ambient conditions. Intercooling is another low‐technology modification which can improve performance of simple and steam injected gas turbine cycles. Because of the uncertainties relating to an efficiency comparison of steam injected and simple cycle designs, the decision as to whether it is worthwhile to give more emphasis to steam injected cycles should be made on grounds other than efficiency alone. Therefore, this study comparatively evaluates simple, intercooled, steam injected (STIG), and intercooled steam injected (ISTIG) gas turbine cycles from the points of efficiency, network output, economics, and pollutant emissions using an advanced validated thermoenvironomic model. Optimum cycle parameters are investigated. Economic feasibility of steam injection and intercooling on simple and intercooled cycles are evaluated using an updated plant cost data. Total and environmental costs as well as profit of the plant owner are estimated for varying fuel costs and varying cycle parameters such as pressure, steam injection, and equivalence ratio. Results of our analysis based on the characteristic cycle parameters show that network output increases up to 22.2% and 14% respectively, when steam injection is implemented on simple and intercooled gas turbine cycles which correspond to up to 6.7% and 4.4% decrease in specific fuel consumption. Steam injection decreases NOx emissions of simple and intercooled cycles up to 67.2% and 65.2% respectively, and provides up to approximately 126.3% increase in net profit of intercooled cycle at the expense of an increase in total cost by 3.3%.

Thermodynamic analysis of the thermal and exergetic performance of a mixed gas-steam aero derivative gas turbine engine for power generation

“…An aero-derivative GT is considered since this type of engine is attractive for several reasons. First of all if compared to industrial gas turbines they have a quick start-up capability and can do this frequently without causing significant maintenance costs [ 18 ]. Another very advantageous property is that the compressor has variable inlet guide vanes with which the intake of air can be reduced.…”

Mathematical Modelling of Marine Power Plants with Thermochemical Fuel Treatment

“…Behind the reactor, the exhaust gas temperature has sufficient potential to produce recovery of the boiler steam required for the 'steam reforming' of the base fuel in the reactor. In the power module, similar to STIG cycle turbine units [22][23], water was removed from the cycle [24]. A desalination plant was provided to compensate for water losses [25].…”

Numerical Simulation of an Aerothermopressor with Incomplete Evaporation for Intercooling of the Gas Turbine Engine

“…air cooling at the compressor inlet [1][2][3]; wet compression (contact air cooling during compression in a compressor stage) [2,4]; additional cooling at the compressor outlet with subsequent recuperation [5]; utilization of the exhaust gases heat of the gas turbine plant (GTP) in the steamturbine heat recovery circuit (gas-steam turbine technology "Vodoley") [6]; steam injection (technology Steam Injected Gas Turbine (STIG), Cheng cycle) [2,7]; water injection into the air flow in the humidifying tower (Humidified Air Turbine (HAT) and Evaporative Gas Turbines (EvGT) technologies) [8,9]; superheated water injection [6].…”