Energy and Exergy Analyses of Regenerative Gas Turbine Air-Bottoming Combined Cycle: Optimum Performance

Khan, Mohammad Ashraf

doi:10.1007/s13369-020-04600-9

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…Based on the above-discussed literature and other available literature, one can find that many researchers present the theoretical analysis of the air bottoming cycle in which the topping cycle is a simple gas turbine cycle [32][33][34]. No literature is available that provides comparative analyses of the air bottoming cycle in which the topping cycle is either a simple gas turbine cycle, a regenerative gas turbine cycle, an intercool gas turbine cycle, a reheat gas turbine cycle, or an intercool-reheat gas turbine cycle.…”

Section: Introductionmentioning

confidence: 99%

Archive of Mechanical Engineering

Khan,

Alzafiri

2022

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To meet the continuous demand for energy of industrial as well as commercial sectors, researchers focus on increasing the power generating capacity of gas turbine power plants. In this regard, the combined cycle is a better solution in terms of environmental aspects and power generation as compared to a simple gas turbine power plant. The present study is the thermodynamic investigation of five possible air bottoming combined cycles in which the topping cycle is a simple gas turbine cycle, regenerative gas turbine cycle, inter-cool gas turbine cycle, reheat gas turbine cycle, and intercool-reheat gas turbine cycle. The effect of pressure ratio of the topping cycle, the turbine inlet temperature of topping cycle, and ambient temperature on net power output, thermal efficiency, total exergy destruction, and exergetic efficiency of the combined cycle have been analyzed. The ratio of the net power output of the combined cycle to that of the topping cycle is maximal in the case when the topping cycle is a simple gas turbine cycle. The ratio of net power output and the total exergy destruction of the combined cycle to those of the topping cycle decrease with pressure ratio for all the combinations under study except for the case when the topping cycle is the regenerative gas turbine cycle. Nomenclaturew work net output, kW ṁ mass flow rate, kg/s h specific enthalpy, kJ/kg s specific entropy, kJ/(kg K

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Section: Introductionmentioning

confidence: 99%

Archive of Mechanical Engineering

Khan,

Alzafiri

2022

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“…Agustín M. Delgado-Torres [13] studied the impact of the cycle configuration on the accuracy of the findings with the perfect gas model and they recommended that the procedure, rule or temperature at which the constant isobaric heat capacity is assessed should be constantly specified if a perfect gas based methodology is used. Khan [14] investigate the performance of air bottoming combined cycle and regenerative gas turbine cycle operated by the partial amount of exhaust gases from gas turbine. This study presents the unique technique to compare the performance of these two cycles and prove that for thermal efficiency and exhaust gases exergy loss by regenerative gas turbine cycle is much better as compared to air bottoming cycle but for net power output air bottoming cycle is better than regenerative gas turbine cycle.…”

Section: Introductionmentioning

confidence: 99%

Combined effect of variable parameters on the performance of gas turbine cycles

Khan

2021

Journal of Thermal Engineering

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The gas turbine cycle is the key solution for the power generation system from the last decade. several types of research are going to enhance the overall system efficiency of the gas turbine cycle. In the present study, six sets have been investigated parametrically for energy and exergy. Thermodynamic assessments have been effectively achieved for the compressor pressure ratio from 4 to 14, turbine inlet temperature (TIT) from 1000K to 1500K, and ambient temperature 250C to 450C. Results show that for every 100 rises in ambient temperature the maximum decrease in peak output and peak thermal efficiency is 6.2% and 5% respectively at 1000K and 3.6% and 1.9% respectively at 1500K. The exergy loss by exhaust gases of set 4 and set 5 increased by 107% whereas set 6 is decreased by 85.5% as compared to set 1 under the conditions when the exergy loss by exhaust gases of set 1 is minimum at TIT 1000K. The total exergy destruction of set 3, set 4, set 5, and set 6 is increased by 102%, 32.6%, 133.3%, and 102% respectively as compared to set 1 under the conditions when the total exergy destruction of set1 is minimum at TIT 1000K. Regenerative Gas Turbine cycle is the best in terms of the ratio of net output to exergy destruction of the plant as well as initial, operational, and maintenance costs.

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