Combustion Characteristic Investigation Of Gas Mixture Derived From Biomass Catalytic Gasification By PLIF

With the continuous development of society and increasing consumption of energy,the energy crisis will not only constrain the development of world's economy but also threaten the survival of mankind.So the search for new energy to achieve sustainable development has become the world's development of the most important issue.It is known that fossil energy reserves are limited and will cause serious pollution problems,and the syngas from biomass catalytic gasification is kind of clean form of energy,and the syngas from biomass catalytic gasification can be used in gas turbine,meanwhile we are rich in biomass energy and biomass catalytic gasification technology is mature,therefore,the study of syngas from biomass catalytic gasification is meaningful.Under such background,PLIF?Planar laser induced fluorescence?technology is used to study the combustion of gas mixture from biomass catalytic gasification.The objective of the present study focuses on the effects of components fraction,CO₂ dilution on tip opening and OH radical distribution of laminar non-premixed Bunsen flames and the effects of components fraction,CO₂ dilution,equivalent ratio on OH radical distribution and burning velocity of laminar premixed Bunsen flames.The experimental results of non-premixed Bunsen flames are as follows:?1?Tip opening is obviously seen from OH-PLIF images;the stretch rates were calculated accurately.The negative stretch contributed by flame curvature and flow strain leads to tip opening of laminar non-premixed Bunsen flames,and flow strain is the dominant factor.?2?As the hydrogen content in syngas increases,the absolute value of stretch rates increase,tip opening of laminar non-premixed Bunsen flames tend to be more obvious.As the CO₂ dilution increases,the absolute value of stretch rates decrease,tip opening of laminar non-premixed Bunsen flames tend to be less obvious consequently.?3?Under the same CO₂ dilution rate,according to the results from C hemkin,the production rates of OH radical and the peak value of total p roduction rates of OH radical increase a little while the profile of OH radical distribution becomes broader,so OH radical concentration decreases;As the CO₂ dilution increases the production of OH radicals is reduced due to the decrease of flame temperature,percentage of fuel,so OH radical concentration decreases.The experimental results of premixed Bunsen flames are as follows:?1?As the CO 2 dilution rate increases,the height of the flame fronts surface increases,the burning velocity decreases,and the profile of OH radical distribution becomes smaller.?2?As the increase of H2,height of the flame fronts surface decreases,the burning velocity increases a lot,the profile of OH radical distribution becomes bigger,and the high concentration of OH radical shift to the outer boundary.?3?As the equivalent ratio f increases,the height of the flame fronts surface decreases,the burning velocity increases,the growth rate of burning velocity at f<1 is larger than that of f>1,and the high concentration of OH radical shift to the outer boundary.