The Study Of Combustion Performance And Pollution Emissions Of Low Emission Combustor Using Prediction Model

To be able to quickly and accurately assess combustion performance and emission characteristicsof gas turbine combustor, this paper develops chemical reactor network model method (CRN) basedon CFD simulation results, a low computational effort modeling method, which can accurately predictemission.Firstly, it takes a review the development and the main research status of chemical reactornetwork model. It also introduces chemical reactors which can constitute chemical reactor networkmodel and describes the concepts, principles, solving methods, use characteristics and calculationbasis of chemical reactors in detail. Moreover, the pollution emission prediction program is designedand written with Visual Studio2010as the development environment and using.Net Framework4.0and C as development language. It describes the frame structure of the program, the main function ofthe program and the realization method of the inner class.And then, a Lean Premixed Prevaporized (LPP) low emission combustor is studied by usingnumerical simulation. The flow field and temperature field of the simulated results and some regionswhere affect NOXemissions relatively large are detailed analyzed. The space in the combustor isdivided into several different subspaces based on CFD results and different subspaces adopt differentchemical reactors. The chemical reactor network model is build using these chemical reactors. Thechemical reactor network method is used to simulate combustion processes and calculate emissionsusing the pollution emission prediction program. Their simulated results are reasonable when they arecompared to experimental data. At the last, the influence of inlet air temperature and amount ofprimary fuel and pilot fuel on temperature and emissions are analyzed. The trends are reasonable.The analysis of the simulation results show that NOXemission is predicted reasonably usingchemical reactor network method. This paper draws the conclusion that chemical reactor networkmethod is feasible in predicting NOXemissions of gas turbine combustor. The chemical reactornetwork method can not only shorten the design cycle of gas turbine combustor, but also effectivelyreduce test times. It can provide useful guidance for the preliminary design and the optimal design ofthe low emission combustor.