Abstract
This paper investigates the effects of site based parameters such as ambient temperature, humidity, altitude and heat transfer characteristic of a dual pressure heat recovery system on the performance of the combined cycle power plant within an equatorial environment. The bulk heat utilization and configuration of a dual pressure heat recovery system are investigated. It is observed that the heat system configuration play a vital role in optimizing the combined cycle overall performance, which has proportionality relationship with the operating ambient temperature and relative humidity of the gas turbine. The investigation is carried out within the ambient temperature range of 24℃ to 35℃, relative humidity of 60% to 80%, and a high level steam pressure of 60 bar to 110 bar. The results show that at 24℃ ambient temperature, the heat recovery system has the highest duty of 239.4 MW, the optimum combined cycle power output of 205.52 MW, and overall efficiency of 47.46%. It further indicates that as the ambient temperature increases at an average exhaust gas temperature of 530℃ and mass flow of 470 kg/s, the combined cycle power output and efficiency decrease by 15.5% and 13.7% respectively under the various considerations. This results from a drop in the air and exhaust mass flow as the values of the site parameters increase. The overall results indicate that decreasing the ambient temperature at optimum exhaust gas flow and temperature increases the heat recovery system heat duty performance, the steam generation, overall combined cycle power output and efficiency, which satisfies the research objective.
Highlights
The growing need of energy in modern civilization has prompted the need to optimize energy sources globally
Gas turbine is a very satisfactory means of producing mechanical power [1] [2], the combination of gas and steam turbines are the greatest means to generate mechanical power both for combined power generation and combined heat and power generation. Both gas and steam turbines have been successfully working in large scale to generate the electricity and steam for heating, whereas gas turbine ensures superior thermal efficiency as compared to steam turbine
The overall performance of the combined cycle power basically depends on the operating conditions of the gas turbine and the heat recovery steam generator (HRSG) configurations
Summary
The growing need of energy in modern civilization has prompted the need to optimize energy sources globally This can be enhanced through an effective parametric evaluation of exiting plant to minimize losses, and to understand the performance rate of such system. Gas turbine is a very satisfactory means of producing mechanical power [1] [2], the combination of gas and steam turbines are the greatest means to generate mechanical power both for combined power generation and combined heat and power generation. The overall performance of the combined cycle power basically depends on the operating conditions of the gas turbine and the heat recovery steam generator (HRSG) configurations. Commercially available generation CCGT power plants achieve total thermal efficiencies typically in the range 50% - 60% based on the operating environment
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
