Conference Paper

Thermal Analysis of Open-Cycle Regenerator Gas-Turbine Power-Plants

Conference: National Conference in Mechanical Engineering for Research & Postgraduate Studies (NCMER)
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    ABSTRACT: This study deals with energy and exergy analysis of simple and regenerative gas turbines with inlet air cooling using lithium bromide-water absorption refrigeration cycle. A parametric study has been carried out and effects of important factors like compressor inlet air temperature, pressure ratio and turbine inlet temperature on the performance of the cycles were studied. The results show that for each 10°C decrease of inlet air temperature, net output power increases around 6-12% and the first and second law efficiencies increase around 2-7%. It is shown that the amount of this increase is higher when the pressure ratio is high and turbine inlet temperature is low. Also exergy destruction of all components has been calculated and the results indicate that the combustor has the largest contribution on exergy destruction and the exergy destruction of absorption refrigeration cycle is very low as compared to that of the gas turbine one. It is also found that the energy content of exhaust gases in both simple and regenerative gas turbines is more than enough to run the refrigeration cycle. The results of required cooling load can be helpful in estimating the cost of the necessary absorption refrigeration unit.
    Journal of Applied Sciences. 01/2009;
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    ABSTRACT: Gas turbines with air–water mixtures as the working fluid promise high electrical efficiencies and high specific power outputs to specific investment costs below that of combined cycles. Different humidified gas turbine cycles have been proposed, for example direct water-injected cycles, steam-injected cycles and evaporative cycles with humidification towers. However, only a few of these cycles have been implemented and even fewer are available commercially. This paper comprehensively reviews the literature on research and development on humidified gas turbines and identifies the cycles with the largest potential for the future. In addition, the remaining development work required for implementing the various humidified gas turbine cycles is discussed. This paper can also be used as a reference source that summarizes the research and development activities on humidified gas turbines in the last three decades.
    Energy. 01/2005;
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    ABSTRACT: An alternative configuration for a regenerative gas turbine engine cycle is presented that yields higher cycle efficiencies than either simple or conventional regenerative cycles operating under the same conditions. The essence of the scheme is to preheat compressor discharge air with high temperature combustion gases before the latter are fully expanded across the turbine. The efficiency is improved because air enters the combustor at a higher temperature, and hence heat addition in the combustor occurs at a higher average temperature. The heat exchanger operating conditions are more demanding than for a conventional regeneration configuration, but well within the capability of modern heat exchangers. Models of cycle performance exhibit several percentage points of improvement relative to either simple cycles or conventional regeneration schemes. The peak efficiencies of the alternative regeneration configuration occur at optimum pressure ratios that are significantly lower than those required for the simple cycle. For example, at a turbine inlet temperature of 1300°C (2370°F), the alternative regeneration scheme results in cycle efficiencies of 50% for overall pressure ratios of 22, whereas simple cycles operating at the same temperature would yield efficiencies of only 43.8% at optimum pressure ratios of 50, which are not feasible with current compressor designs. Model calculations for a wide range of parameters are presented, as are comparisons with simple and conventional regeneration cycles.
    Journal of Engineering for Gas Turbines and Power-transactions of The Asme - J ENG GAS TURB POWER-T ASME. 01/2002; 124(3).

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