The Numerical Simulation And Experimental Research On Characteristics Of Flame Stability Of Submerged Combustion Burner

The contradiction between environment protection and economic growth was increasingly prominent.Giving consideration to both environmental protection and economic growth,we must increase the use of clean energy and improve the efficiency of equipment.Heat of submerged combustion burner is from the combustion of nature gas.It was effective,protecting environment and widely application.The environmental protective,safety and reliability of submerged combustion are depends on the flame stability.The SCV equipment appeared detonating,incomplete combustion and flameout.In this paper,the experimental device still occurred to shake and make undue noise.Therefore,the research on flame stability of submerged combustion was practical significance.In the research based of premixed combustion flame stability theory,fluid mechanics and chemical reaction,it was used to build a mathematical model of flame stability equation.The pressure fluctuations led to fire off or beyond the concentration of combustible gas concentration range,and finally the device flamed out.The paper analysis how the burner power,immersion depth and excess air coefficient and other factors effect on the flame stability and try to give pressure fluctuation range of stable combustion.Experimental results showed that the submerged burner of combustible concentration range is narrower than general combustion.At the time of immersion burner design,it must give full consideration to the initial design of gas concentration.The experimental data were consistent with the theoretical calculated results,and the effects of power on the critical condition were not obvious.The main influence factor is the immersion depth.Increasing submersion depth and coefficient of excess air,resulted in large back pressure fluctuation range.By the means of fast Fourier transform(FFT),it analyzed cycle of pressure fluctuation.The results showed that cycle is only related with the immersion depth.The greater the submergence depth,the greater the pressure fluctuation cycle.The numerical simulation of stall condition was concerning different submergence depth of 0.4 m,0.7 m,1.0 m,of 160 kW.The pressure fluctuation value of the cut-off,error between numerical simulation and the experiment measured contrast,is 14.9%,18.4% and 18.2% respectively.The analysis of the stall reason was verified.