Thermodynamic Analysis of Effects of the Inlet Air Cooling on Cycle Performance in Combined Brayton-Diesel Cycle

Year 2020, Volume: 7 Issue: 1, 7 - 16, 26.03.2020

Betul Sarac Teoman Ayhan

https://doi.org/10.17350/HJSE19030000166

Cited By: 1

Abstract

In the present study, the effects of inlet air cooling on compound cycle performance in a diesel gas turbine engine system where waste heat is used in the composite power system in the sustainable energy system were investigated thermodynamically. The effects of the inlet air cooling the system that enhances power production and the resulting thermal efficiency values were analyzed based on various operational variables gas turbine pressure ratio, diesel engine compression ratio, gas turbine inlet and fresh air inlet temperatures, etc. . The energy losses in each system component were determined and the second law efficiency of the system was determined based on the introduced operational parameters. The gas turbine unit in the model included a gas generator with two compressors and a high-pressure turbine, and a low-pressure power turbine running on a separate shaft. The diesel engine and gas-generator exhaust gases were mixed and expanded in a low-pressure turbine, leading to the production of power with the waste energy. In the cycle, an intake air cooler, an intercooler and a recuperative air pre-heater were used. In the intake air cooling cycle, the power increase was around 15% when the pressure rate of the low-pressure compressor was 3.5. Natural gas was used as fuel in the thermodynamic model. The cycle irreversibilitywas used in the calculations based onthe thermodynamic concepts.

Keywords

Brayton-diesel cycle, Combined power system, Energy, Exergy

References

• Kumar A., Sanjay M. and Prasad L. Parametric analysis of cooled gas turbine cycle with evaporative inlet air cooling. International Journal of Scientific & Engineering Research. 3 (2012) 3, 1-8.
• Zaki GM, Jassim RK, Alhazmy MM. Energy, exergy and thermoeconomics analysis of water chiller cooler for gas turbines intake air cooling. Smart Grid and Renewable Energy. 2 (2011) 190-205.
• Stone R. Introduction to Internal Combustion Engines. The Mac Millan Press LMTD. 1992.
• Çengel YA, Boles BA. Thermodynamics and Engineering Approach. McGraw Hill-Science, 6th edition. 2001.
• Mohammadkhani F, Khalilarya SH, Mirzaee I. 2012. Energetic and Exergetic Analysis of Internal Combustion Engine Cogeneration System. The Journal of Energy: Engineering & Management. 2 (2012) 4 24-31.
• Reddy S.S.K., Pandurangadu V. and S.P.A. Hussai S.P.A. Effect of turbo charging on volumetric efficiency in an insulated diesel engine for improved performance. International Journal of Modern Engineering Research (IJMER). 3, (2013) 2 674-677.
• Ebrahimi R. Thermodynamic modelling of performance of an irreversible Diesel cycle with engine speed, ature and Science. 7 (2009) 9 78-82. Qian JY, Zhang Y, Zhuge W. Air supply system design of a diesel_brayton combined cycle. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy. (2018) https://doi. org/10.1177/0957650918810133
• Sreedharan H, Reshma JR, Jacob JK, Sivakumar VV. Energy and exergy analysis on 350 MW combined cycle power plant. European Journal of Technology and Design. 12 (2016) 2 72-78.
• Abuşoğlu A, Kanoğlu M. Exergetic and thermoecomnomic analyses of diesel engine powered cogeneration: Part 1- Formulations. Journal of Applied Thermal Engineering. 29 (2009) 234-241.
• Karali R, Öztürk İT. Effiency improvement of gas turbine cogeneration systems. Improving the efficienc of gas turbine cogenartion systems. Technical gazette 25 suppl 1 (2017), 21-27. DOI: 10.17559/TV-20140509154652
• Karaca, S. 2015. Application of energy and exergy analysis due to different angles of propeller blades to a turbocharged diesel engine vessel. Master thesis. Karadeniz Technical Iniversity, Trabzon.