Fukuo Maeda

Prediction Model of NOx for Gas Turbine Combustor With Diffusion and Lean Premixed Flames

In order to predict the NOx concentration etc., it is necessary to carry out 3-D reacting flow analysis in the combustion zone. However, regardless of improved numerical scheme, and physics-based modeling of flow phenomena and combustion reaction, these techniques not yet reached to a level to be applied to practical combustor problem, because of vast computation time and consequently high computation costs, etc. To improve NOx characterization of new Dry Low NOx Combustor (DLNC) and optimum fuel scheduling for DLNC operations, a NOx prediction method to be applicable for practical combustor problems needs to be developed.In this paper has been proposed a simple semi-empirical model for predicting DLNC NOx emissions that formed from lean premixed combustion flames and diffusion flames. This model comprised of experimental coefficients for adjusting or incorporating effects of practical combustion liner configurations and effects of flow conditions in combustion zone, etc. Also, the present model is applied to newly designed and redesigned DLNC for estimating NOx emission levels and its variation with gas turbine operating conditions, which are compared with the experimental data of full pressure combustion with Natural Gas (NG) fuel.Copyright