الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 188 |  |  |
| | | from | 188 | | |
Abstract
Today, increasing the energy demand is a major challenge facing the researchers all
over the world. The rapid increase of thermal power plants installation for the generation
of electrical energy using different kinds of fuel is the main reason of the environmental
pollution, such as acid precipitation, stratospheric ozone depletion and global climate
change. Producing electrical energy in traditional thermal power plants utilizing fossil
fuels release large amounts of carbon dioxide into the atmosphere causing greenhouse effect
and contributing to the global warming potential. In addition, the oil crisis in the early
seventies of the previous century and subsequent increasing the prices of the conventional
fuels leads to study comprehensively new strategies of energy conversion such as cogeneration
system to save the available energy resources. The cogeneration thermal power
plant is an efficient, clean and reliable approach to generate electrical energy as well as to
supply thermal energy.
In the present study, energy and exergy analyses are studied to examine and understand
the performance of the cogeneration power plant for Quena Paper Industry Company
(QPIC) with a capacity of 45 MW utilizing natural gas. As well as, this investigation
is devoted to identify and evaluate the different components of the cogeneration system
to manage and improve the overall performance of the system. The current study is carried
out to identify and quantify the components maintaining the largest energy and exergy
losses. Moreover, the exergy efficiency is determined yearly for each component at
different ambient temperatures, i.e., 18 0C, 23 0C, 29 0C, 36 0C and 45 0C at 100%, 75%,
50% and 25% loads. Furthermore, the current study presents essential improvements for
boiler to reduce the exergy destruction at different values of flue gases temperatures,
main steam temperature and mass flow rate of fuel. In addition, the study gives recommendations
to improve the existing cogeneration power plants for QPIC.