Modares Mechanical Engineering

Modares Mechanical Engineering

Field study of the effect of various gas turbine and supplementary firing operating modes on the performance of a real combined cycle power plant

Document Type : Original Research

Authors
Afshin Abdollahian 1
Mehran Ameri 2
1 Mechanical Engineering Faculty, Islamic Azad University Branch of Kerman, Kerman, Iran
2 Mechanical Engineering Department, Engineering Faculty, Shahid Bahonar University of Kerman, Kerman, Iran
Abstract
Supplementary firing system is one of the common methods of increasing the power generated of combined cycle units. Low cost of investment to the rate of increase of the generative power has encouraged the designers to use this method in the above power plants. In this article, field study of the performance changes of a real combined cycle unit with and without supplementary firing has been performed from energy and exergy viewpoints. Studies show that in all operation modes subject to research, using supplementary firing causes an increase in power generation up to 26.3MW, energy efficiency of steam cycle about 2.43% and decreases the exergy destruction of steam flow control valves. But this system has a negative impact on energy and exergy efficiencies of the whole combined cycle, which at the worth case about 1.17% decreases energy efficiency. In addition, it was specified that the power plants operation in the partial loads causes high exergy destruction in the cycle which steam cycle increased energy and exergy efficiencies due to use supplementary firing system cannot fully compensate it.
Keywords
Combined Cycle Power Plant
Regenerative Heat Exchanger
Extra Combustion
Exergy

Subjects

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Modares Mechanical Engineering
Volume 21, Issue 5
April 2021
Pages 285-295