الفهرس | Only 14 pages are availabe for public view |
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. |