Study on Calculating Method of NOx Emission FromMitsubishi Gas Turbine Unit Under Full Load
In order to accurately and quickly predict the emission of pollutants in the stable operation of gas turbine combustor,a design process for predicting NOx emission using numerical simulation is proposed in this paper.Firstly,the design parameters are determined according to the type of gas turbine combustion chamber and control components.Secondly,the Latin hypercube method is used to optimize the values of inlet pressure P,outlet temperature T,main air mass flow q and equivalent ratio φ to form the sample space of main parameters.Then,according to the numerical simulation results of computational fluid dynamics(CFD),a chemical reactor network model is generated to provide the basis for the chemical partition of the combustion chamber,and the pollutant emission value is calculated by chemical reactor network method(CRN)according to the above sample space.Finally,the main influencing parameters are selected from the many parameters that affect pollutant emission,the NOx prediction formula with multi-parameter influence is fitted,and the influence relationship of four significant parameters on NOx emission is analyzed.The results show that when the combustion chamber pressure increases at full load,NOx emission increases.Combustion chamber temperature increases,NOx emission increases;With the increase of main air mass flow rate,NOx emission showed a decreasing trend.NOx decreases with the increase of equivalent ratio.The correlation between the simulation and the classical model is consistent in the study range,which shows that this prediction method has universality and applicability.The parameter selection and NOx emission calculation methods are efficient and reliable.The fitting formula has obvious universality and can provide reference for the combustion chamber operating conditions and gas turbine design.
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