ExperimeutaI Study On Low-load Combistion Stability Of Boilter

Electricity is an indispensable secondary energy source for human beings.In recent years,with the country's requirements for e.nvironmental protection,more and more new energy power has been put into operationIt brings great challenges to the traditional thermal power operation mode.The characteristics of random,intermittent and unstable of new energy have led to the transformation of thermal power.The thermal power become more and more flexible and operate long-term in deep peaking operation mode.In this flexible and long-term low-load operation,the operational stability of thermal power plants becomes the basis for safe production and economic benefits.The operational stability of thermal power plants is closely related to the combustion stability of fuels in boilers.This paper analyzes the chemical dynamics of combustion from the combustion mechanism and analyzes the factors affecting combustion.Pressure fluctuations are the main research object among these related factors,because they can reflect the burning situation intuitively and quickly.A model of combustion pressure fluctuations is established based on assumptions and simplified conditions.Finally we get conclusion that pressure is related to the speed of combustion propagation.It is impossible to accurately quantify the theoretical analysis,and some inferences are the shortcomings under ideal conditions.In this paper,the auxiliary analysis of stability is carried out through experiment.The actual operating conditions were obtained in the experimental platform built.We will do analyzed in terms of statistical characteristics,time domain and spectrum.A direct relationship between combustion and pressure fluctuations is obtained.Finally,this paper uses the historical data of power plant production,combines the characteristics of load and load first-order difference in actual production,extracts the power spectral density of the furnace negative pressure,establishes a two-group combustion characteristic model,and proposes the measurement of combustion moment and symmetry moment.An indicator of stability.