Study On The Combustion And Emission Characteristics Of Waste Oil Biodiesel In Industrial Furnaces And Kilns

Biodiesel is a clean energy source that can be used as a substitute fuel for petrochemical diesel by using transesterification of animal and vegetable oils,waste oils and algae.Because of the wide range of biodiesel raw materials,the renewability and the low emission of pollutants after biodiesel combustion,biodiesel has received extensive attention and research from researchers.In China,at least 5 million tons of waste oil is produced every year,and less than 10%is used for industrial production.Most of the rest is discarded or returned to the table.The use of waste oil to make waste oil biodiesel can NOx only protect the environment,but also achieve Fei Weibao’s effect.At present,research on biodiesel is mainly concentrated on internal combustion engines,and research on industrial furnaces and kiln is less,which limits the industrial development of biodiesel.Through the self-built biodiesel high-efficiency atomization combustion system,the three independent variables of excess air coefficient,oxygen enrichment and air distribution ratio were changed to study the combustion flame morphology,turbulent flame burning speed and pollution of industrial oil in the industrial furnace.Characteristics of NOx and CO emissions.The flame shape is the macroscopic appearance of the combustion flame.The combustion velocity of the turbulent flame can quantitatively study the stability of the turbulent combustion flame.The pollutant emission can study the variation law of the pollutant NOx and CO concentration after combustion.Therefore,the paper comprehensively studied the variation of combustion flame stability and NOx and CO concentration of burned biodiesel in industrial furnaces and kiln,in order to provide theoretical and data support for the combustion of waste oil biodiesel in industrial furnaces.Firstly,the paper extracts the flame characteristic values by MATLAB software,and then studies the effects of the three variables of excess air coefficient,oxygen enrichment and distribution ratio on the eigenvalues.The results show that the flame length decreases with the increase of excess air coefficient,and increases with the increase of the air distribution ratio.The greater the oxygen enrichment,the shorter the flame length and the smaller the flame pulsation variance;the flame area increases with The excess air coefficient decreases and decreases,and increases with the distribution ratio.The larger the oxygen enrichment is,the shorter the flame area is,and the smaller the flame pulsation variance is.The flame circumference decreases with the increase of excess air coefficient.As the proportion of air distribution increases,the greater the oxygen enrichment,the shorter the flame circumference;the flame brightness decreases first and then increases with the increase of excess air ratio and distribution ratio,with oxygen enrichment as the increase increases,the flame pulsation gradually decreases.The degree of flame fragmentation increases with the increase of excess air coefficient and oxygen enrichment,and decreases with the increase of the ratio of the distribution air.Secondly,the turbulent flame combustion model is established to study the influence of three variables on the burning speed.The results show that the flame burning speed increases with the increase of excess air coefficient and oxygen enrichment,and decreases with the increase of the distribution ratio.small.Finally,the effects of three independent variables on NO_X and CO emission concentrations were studied.The results show that with the increase of excess air coefficient,NO_X increases first and then decreases,CO concentration decreases first and then increases,and both are in excess air coefficient.The inflection point occurs at1.2;with the increase of oxygen enrichment,the concentration of NO_X increases gradually,and the concentration of CO decreases gradually.With the increase of the ratio of distribution,the concentration of NO_X increases first and then decreases,and the concentration of CO decreases first and then increases.Large,and all have an inflection point when the distribution ratio is 4:1.And using the fitting coefficient constant regression method to establish a prediction model of the combined effects of three factors on NO_X and CO emission concentration,the following equation is obtained:The combined effect of three factors on the prediction model of NO_X:y=-1316.4X₁²+3178.6X₁-2X₂²+14.3X₂-2.6X₃²+27.1X₃-2154.2The combined effect of three factors on the prediction model of CO:y=2026.2X₁²-5504.2X₁-4X₂²+15.8X₂+20.5X₃²-172.8X₃+4111.7...