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Proceedings of the Second International Energy 2030 Conference,
November 4-5, 2008, Abu Dhabi, U.A.E.

A Simplified Model for Pollutant Emission Prediction from a Gas Turbine Combustor

Mohamed Sassi

The Petroleum Institute, UAE

Yasser El-Wahdi

The Petroleum Institute, UAE

Abdullah Ramsey

The Petroleum Institute, UAE

Abstract
Combustion is a very complex phenomenon that includes the interactions between fluid mechanics, heat transfer, mass transfer, and chemical kinetics. In turbulent combustion, the turbulence-chemistry interactions make things even more complicated in terms of turbulence and combustion closure models. One is then forced to simplify the chemical kinetics model to be able to account for better turbulent flow transport [1], or to simplify the fluid mechanics by using ideal flow chemical reactors that account for detailed chemical kinetics [2]. Both of these last two approaches rely on complicated computational models that require high cpu times. This inhibits their use in process simulator software for quick chemical process case studies.

The objective of this work is thus to develop a quick design tool for gas-turbine combustors that accounts for the effects of reactant stream splitting, recirculation ratio, and combustion staging, among other operating conditions on the turbine efficiency and pollutant emissions. We have therefore used the process simulator HYSYS [Version 3.2] to generate a simplified process flow sheet model for the gasturbine. A network of ideal flow chemical reactors in series and/or in parallel is used to simulate the combustor. This model is often complemented by CFD modeling to determine the stream flow rates into the different reactors of the network. The developed design tool is very efficient and features results that




 

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