Thermodynamic Analysis of GT Cycle with Naphtha or Natural Gas as the Fuel: A Thermodynamic Comparison

Authors: S. Arpit, P. K. Das, S. K. Dash

Abstract:

In this paper, a comparative study is done between two fuels, naphtha and natural gas (NG), for a gas turbine (GT) plant of 32.5 MW with the same thermodynamic configuration. From the energy analysis, it is confirmed that the turbine inlet temperature (TIT) of the gas turbine in the case of natural gas is higher as compared to naphtha, and hence the isentropic efficiency of the turbine is better. The result from the exergy analysis also confirms that due to high turbine inlet temperature in the case of natural gas, exergy destruction in combustion chamber is less. But comparing two fuels for overall analysis, naphtha has higher energy and exergetic efficiency as compared to natural gas.

Keywords: Exergy, gas turbine, naphtha, natural gas.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3607803

References:

[1] Kaushik SC, Reddy VS, Tyagi SK. Energy and exergy analyses of thermal power plants: A review. Renew Sustain Energy Rev 2011;15:1857–72. doi:10.1016/j.rser.2010.12.007.
[2] Ersayin E, Ozgener L. Performance analysis of combined cycle power plants: A case study. Renew Sustain Energy Rev 2015;43:832–42. doi:10.1016/j.rser.2014.11.082.
[3] Ibrahim T k., Kamil M, Awad OI, Rahman MM, Najafi G, Basrawi F, et al. The optimum performance of the combined cycle power plant: A comprehensive review. Renew Sustain Energy Rev 2017;79:459–74. doi:10.1016/j.rser.2017.05.060.
[4] Ibrahim TK, Basrawi F, Awad OI, Abdullah AN, Najafi G, Mamat R, et al. Thermal performance of gas turbine power plant based on exergy analysis. Appl Therm Eng 2017;115:977–85. doi:10.1016/j.applthermaleng.2017.01.032.
[5] Zare V, Mahmoudi SMSMS, Yari M, Amidpour M, Yildirim U, Gungor A, et al. Exergy analysis of the LFC process. Energy 2016;107:1–9. doi:10.1016/j.applthermaleng.2014.12.024.
[6] Montero M, Paepe W De, Bram S, Parente A, Contino F. Does humidification improve the micro Gas Turbine cycle ? Thermodynamic assessment based on Sankey and Grassmann diagrams q. Appl Energy 2017;204:1163–71. doi:10.1016/j.apenergy.2017.05.067.