Research On Low Emission Combustion Technology Of Aeroderivative Gas Turbines

Aeroderivative gas urbine or gas turbines is an important energy power equipment,and its application involves all aspects of national economy and people's livelihood.It is one of the "being hit in the throat" technologies that my country is currently in urgent need of a breakthrough.Pollution emissions are an important issue that restricts the development of my country's gas turbine industry.If emissions do not meet the standards,they will not be able to enter the commercial market.Gas turbine technology cannot accumulate operating data in a fierce market environment to achieve technological upgrades.Breaking through the low emission combustion technology of gas turbines will help improve the competitiveness of my country's gas turbines and promote the sound development of the gas turbine industry.Based on literature and case studies,this paper conducts experiments and numerical research around the key component unit premixed nozzles in the low emission combustor of gas turbines,focusing on the study of the influence of fuel spatial distribution on the performance of premixed nozzles.In the design practice of low emission combustor of gas turbine,the design method of low emission combustor based on unit premixed nozzle is summarized,and the application of this method in different types of low emission combustor is discussed.Research on mature low emission combustion combustors abroad has found that 1)lean premixed combustion technology is the mainstream technology for low emission combustors;2)unit premixed nozzles play a leading role in low emission combustors,and the same unit nozzles can be used in different combustors;3)The difficulty in the design of low emission combustors is to achieve low pollution emissions within a wide range of power.It is necessary to consider the overall situation of the gas turbine to solve the problem of low emission combustion of gas turbines.My country's gas turbine technology foundation is weak,low emission combustion technology is in the research and development stage,combined with mature foreign experience,it is recommended that my country's low emission combustion technology for gas turbines adopt a technology development route based on air staging schemes and supplemented by fuel staging.Based on the research of unit premixed nozzles,premixed nozzles with different fuel injection methods were designed.The combustion experiment was carried out at the air temperature of 300? and 500? and the air velocity of 20?60 m/s.Performance data such as flame structure,pollution emission,combustion oscillation,flameout and flameback boundary.Experiments show that the optimal goal of uniform mixing of fuel and air cannot be used to obtain a premixed nozzle with the best working performance.The fuel spatial distribution should be used as a control method and the overall working performance should be used as the optimization goal to design a satisfactory premixed nozzle.In view of the phenomena found in the experiment,the combustion process of the premixed nozzle was simulated and analyzed by the FGM method,and detailed flow field information such as the fuel mixing process and combustion process of the premixed nozzle was obtained,which deepened the understanding of the premixed combustion mechanism.It also explains the phenomenon in the experiment.For the simulation of combustion pollutants,a chemical reaction network model that does not rely on experience is constructed,and the results are more consistent with the experiment.Based on the design practice and experimental research of a certain type of gas turbine multi-nozzle low-pollution combustor,the strategy design of fuel staging control and its limitations are analyzed,and the influence of fuel staging on the overall pollution emission of the combustor is experimentally studied.Key issues such as the law of flame line wall temperature distribution and the cooling effect of the polit fuel on the nozzle body.On the basis of the above research,the process and method of low emission combustor design are refined and summarized,as well as the issues that should be paid attention to in the design of different types of combustor.Based on the working performance of the unit premixed nozzle,combined with the specific characteristics of the gas turbine combustor,a combination or scaling method is used to design a low emission combustor suitable for different types of gas turbines.The design method is preliminarily verified through case design and experimental research.The feasibility of the method.The design cases in this paper include the low emission combustion chambers of the can type,annular type and silo type.Some of the combustion chambers have completed a technical iteration of scheme design,prototype development and test verification.The experience and lessons accumulated in the design practice of different types of low emission combustors continue to promote the improvement of the design methods of low emission combustors.The exploration of this article in the design of low emission combustor may provide a reference for the research and development of low emission combustor for domestic gas turbines.