DUAL-PRESSURE HEAT RECOVERY BOILER OF COMBINED GAS/STEAM POWER PLANTS

A. Bodalal; A. A. Busedra; K.A. Morad

doi:10.66411/jer.v9i9.161

Authors

A. Bodalal Department of Mechanical Engineering, University of Garyounis Author
A. A. Busedra Department of Mechanical Engineering, University of Garyounis Author
K.A. Morad Department of Mechanical Engineering, University of Garyounis Author

DOI:

https://doi.org/10.66411/jer.v9i9.161

Keywords:

Combined cycle, Overall efficiency, Power ratio, Steam cycle efficiency, Mass ratio, LP and HP drums, Dual-pressure heat recovery boiler

Abstract

The present work has been directed towards the theoretical study of the combined gas/steam turbine power plant incorporating dual-pressure heat recovery boiler. The considered fuel was a natural gas having a composition of 90% methane and 10% ethane by volume. The effects of the parameters of dual-pressure heat recovery boiler, namely the pressures of high-pressure (HP) and low pressure (LP) drums, temperatures of high-pressure and low-pressure steam, and the mass ratio of low-pressure steam to high-pressure steam (m_LH), on the performance of the combined cycle have been considered in the present paper. The results revealed that the net specific power output and the overall efficiency of the combined plant are significantly influenced by the pressures of HP and LP drums of the dual pressure heat recovery boiler. They increased with the increase of the pressure of HP drum and with the decrease of the pressure of LP drum. The temperature of the generated HP steam has a considerable effect on the specific power and overall efficiency of combined plant while the temperature of the results also showed that the optimum mass ratio, m_LH, that gave maximum specific power and overall efficiency, was 0.2

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