Study On Structural Parameters Of Pure Oxygen Flat Flame Burner For Flame Generation

As an important part of the metallurgical furnace,the burner's structure and working conditions directly affect the quality and cost of the product.Flat flame burner is a new type of combustion device developed in recent decades.Compared with traditional DC burner,the flame temperature of flat flame burner is uniform,and the flame surface fluctuation is small.Furnace has a wide range of applications.The flat flame burner has high combustion intensity and high flame temperature.When air combustion is used,the heat loss of flue gas and thermal NOX are more.Therefore,the use of pure oxygen for combustion during flat flame combustion can suppress the generation of NOX and improve the furnace.The heating efficiency is of great significance for achieving efficient and clean combustion in industrial furnaces.In this paper,a pure oxygen flat flame combustion experiment platform is firstly built.According to the existing burner structure,the fuel tube insertion depth and oxygen surplus coefficient are changed to conduct experiments.The results are analyzed by observing the experimental phenomena and measuring data of thermocouple.The results show that the insertion depth of fuel pipe directly affects the mixing position of fuel and oxygen.As the insertion depth decreases,the size of the combustion area and the black-center area of the flame gradually increases,the peak temperature drops by 98?,and the peak position moves towards the outer edge of the expansion mouth,making the combustion more stable.The increase of the excess oxygen coefficient improves the absorption of oxygen by the rotating airflow,leading to the expansion of the size of the flame combustion zone and the reduction of the size of the black center zone.However,the excess oxygen also reduces the thermal efficiency of the burner,which should be between 1.15-1.3 in comprehensive consideration.After that,the structure of the burner was designed by consulting the gas design manual and related literature,and the method of orthogonal experiment was adopted to carry out combined partition.The pure oxygen flat flame burner after partition was numerically simulated with the help of the commercial computational fluid dynamics software Fluent.According to the temperature field,flow field and concentration field of burner,the corresponding evaluation standard is established and analyzed.The results show that the swirl strength of the cyclone has the greatest influence on the flame characteristics of the burner.The optimum parameters of the burner obtained from the orthogonal experiment are: cyclone swirl strength 1.57,radius of curvature of the expansion port 1.4,gas pipe insertion depth 40 mm,oxygen surplus coefficient 1.15.The results of this paper,on the one hand,provide the theoretical basis and technical support for the design and development of the pure oxygen flat flame burner under the condition of pure oxygen combustion.