Performance of combined cycle power plants with external combustion

Doğan, Osman Tufan
Externally Fired Combined Cycle (EFCC) is a recent tcehnology which utilizes coal as the primary fuel a gas turbine cycle. EFCC is among the clean coal technologies aiming at improving the coal combustion performance in a cost effective and environmentally friendly manner. Natural gas is used as the supplementary fuel. The ultimate goal of the EFFC concept is coal onyl option, since natural gas can better be utilized in a modern Gas Turbine Combined Cycle (CCGT) plant. In this study, performance of the EFCC plant is evaluated based on 1st and 2nd law analysis. Different levels of supplementary firing are included in the analyses together with the coal onyl option. Effect of certain plant parameters on the performance indicators are analyzed. Exergy distribution throughout the plant is obtained. It is shown that air heater is the most significant component in terms of irreversibilities. It is also desired to evaluate the performance of the plant, in economic terms. Thermoeconomic analyses are performed for this purpose, based on the SPECO method and the results of exergy related analysis. Cost balance e quations are derived, together with the auxiliary equations formed by using F and P rules, and the resulting set of equations are solved. Cost formation processes are investigated and levelized cost values per unit exergy unit are obtained for each material stream in the plant. It is exit stages of compressor and pump. Results of this study indicate that supplementary firing improves the plant performance, whereas cost of products also increase with supplementary firing. Another observation is that EFCC plant offers performance figures comparable to those for advanced power plant technologies such as Integrated Gasification Combined Cycle(IGCC).


Numerical simulations of gas production from Class 1 hydrate and Class 3 hydrate in the Nile Delta of the Mediterranean Sea
MEREY, ŞÜKRÜ; Longinos, Sotirios Nik (Elsevier BV, 2018-04-01)
Gas hydrate reservoirs are considered as near-future energy resources in the world. As well as the many places in the world, there is also gas hydrate potential in the Mediterranean Sea. In this study, by using the literature data, it was aimed to understand whether the Mediterranean Sea includes necessary parameters for producible gas hydrate reservoirs. It was shown that the Mediterranean Sea contains all of these parameters (source gas, appropriate pressure and temperature, coarse sand potential, etc.). ...
Energy optimization of the Yankee-Hood dryer
Onel, S; Guruz, G (2001-01-01)
The Yankee-Hood dryer is the crucial section of the paper machine due to the consumption of energy. As a consequence of continuously increasing energy costs, determination of the proper operating conditions is essential to operate the tissue machine in the most efficient and economic means while ensuring paper quality. The objective of this study is to evaluate the Yankee-Hood dryer in 'lpekkagit' tissue paper factory, set the mass and energy balances and make optimization studies in order to achieve the de...
Life cycle assessment of two different renewable energy systems for a selected region: Bozcaada island
Şentürk, Ayşe Eylül; Oğuz, Elif (2020-01-01)
Energy production without destroying the environment has been one of the most crucial issues for the people living in today'sworld. In order to analyse whole environmental impacts of energy production process, life cycle assessment (LCA) is widely used. In this study, two distinct renewable energy systems are assessed. First, a land-based wind farm which has been operating in Bozcaada Island since 2000 compared with a proposed solar photovoltaic power plant in terms of Energy Pay-Back Time (EPBT) periods an...
Physical Properties of Particulate Matter Emitted from Combustion of Coals of Various Ranks in O-2/N-2 and O-2/CO2 Environments
Kazanç Özerinç, Feyza (2012-12-01)
This work examined the particulate emissions from pulverized coals burning under either conventional or oxyfuel combustion conditions. Oxyfuel combustion is a process that takes place in O-2/CO2 environments, which are achieved by removing nitrogen from the intake gases and recirculating large amounts of flue gases into the boiler; this is done to moderate the high temperatures caused by the elevated oxygen partial pressure therein. In this study, combustion took place in a laboratory laminar-flow drop-tube...
Local air quality impacts due to downwash around thermal power plants: Numerical simulations of the effect of building orientation
Kayın, Serpil; Tuncel, Süleyman Gürdal; Yurteri, Coşkun (1999-09-01)
One of the primary adverse environmental impacts associated with power generation facilities and in particular thermal power plants is local air quality. When these plants are operated at inland areas the dry type cooling towers used may significantly increase ambient concentrations of air pollutants due to the building downwash effect. When one or more buildings in the vicinity of a point source interrupt wind flow, an area of turbulence known as a building wake is created. Pollutants emitted from relative...
Citation Formats
O. T. Doğan, “Performance of combined cycle power plants with external combustion,” M.S. - Master of Science, Middle East Technical University, 2003.