Abstract
Gas turbine inlet air-cooling (TIAC) is an established technology for augmenting gas turbine output and efficiency, especially in hot regions. TIAC using evaporative cooling is suitable for hot, dry regions; however, the cooling is limited by the ambient wet-bulb temperature. This study investigates two-stage evaporative TIAC under the harsh weather of Riyadh city. The two-stage evaporative TIAC system consists of indirect and direct evaporative stages. In the indirect stage, air is precooled using water cooled in a cooling tower. In the direct stage, adiabatic saturation cools the air. This investigation was conducted for the GE 7001EA gas turbine model. Thermoflex software was used to simulate the GE 7001EA gas turbine using different TIAC systems including evaporative, two-stage evaporative, hybrid absorption refrigeration evaporative and hybrid vapor-compression refrigeration evaporative cooling systems. Comparisons of different performance parameters of gas turbines were conducted. The added annual profit and payback period were estimated for different TIAC systems.
Highlights
Gas turbine power plants have relatively low cost, require less space and are quick turbine power Gas plants have relatively cost, require less spacethat anddraws are quick to beGas commissioned.turbines (Figurelow1) have a compressor air in and to be commissioned
This study focused on investigating the performance of a real gas turbine incorporated with a two-stage evaporative turbine inletozeitoun@ksu.edu.sa air-cooling (TIAC) system (Figure 3) under the hot dry weather conditions of Riyadh city
Figure 11Results shows the output power of the gas turbine with and without differsimulation of the above cases was that conducted for the GE ISO-rated
Summary
Gas turbine power plants have relatively low cost, require less space and are quick turbine power Gas plants have relatively cost, require less spacethat anddraws are quick to beGas commissioned. Air mass flow rate decreases owing to an increase in the ambient te gas turbine power output or thermal refrigeration. The vapor-compression refrigeration system will be driven using work from the turbine atexpense expense of aincrease power output increase because theHowever, inlet air cooling. Alhazmy and Najar [8] reported that evaporative cooling could boost the power output and enhance the efficiency of gas turbines less expensively as compared to the cost of chilling systems. Absorption and vapor-compression refrigeration can be used for the compressor inlet cooling by passing relatively hot ambient air over a coil cooled by chilled water (or brine). Mohapatra and Sanjay [22] reported that vapor-compression refrigeration inlet air cooling could improve the plant-specific work by 18.4% and efficiency by 4.18%, compared with 10.48% and 4.6%, respectively, for evaporative cooling. Comparisons of the proposed system and evaporative and hybrid refrigeration evaporative TIAC systems (Figures 2,4,5) were conducted
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