Structure Design And Optimization Of A Blast Furnace Gas Burner

Blast furnace gas is difficult to use because of its low calorific value.When gangue is mixed in a circulating fluidized bed or used directly in a steam boiler,a conventional burner is usually used,which makes the blast furnace gas combustion unstable and the flame penetration is insufficient due to the low combustion efficiency;in addition,it may also A series of problems occur,such as large pollutant emissions and unstable burner operation.Therefore,the research and development of burners suitable for blast furnace gas combustion has very important industrial application value and academic significance.According to the characteristics of blast furnace gas,through a comparative analysis of the advantages and disadvantages of DC burners and swirl burners,a new type of burner suitable for blast furnace gas combustion was designed.According to the relevant design theory of the burner,the key parts of the burner are designed,and the structure of the burner is optimized using fluid numerical simulation software.In order to improve the stability of combustion,the paper also designed a disc that can stabilize the flame,which is called flame stabilizing disc.The thesis analyzes the influence of swirl blade inclination angle and number of blades on the combustion performance of the burner,and calculates the optimal angle of inclination of swirl blades and the optimal number of air swirl blades,and further analyzes and compares the two before and after improvements The advantages and disadvantages of the burner.In order to design the flame characteristics and combustion performance of the burner for the research institute,the thesis performed a three-dimensional numerical simulation of the burner based on the fluid analysis software Fluent.The model uses a general finite velocity model,a feasible k-? turbulence model and a P-1 radiation heat transfer model.The thesis analyzes the influence of the flame stabilizing disk and different swirl blade inclination angles and the number of swirling blades on the flow field and temperature field.The final results show that: without the flame stabilizing disk,the burner flame will produce a misfire phenomenon.When the inclination angle of the swirling blade in the air channel is 45 degrees and the number of blades is 50,it not only benefits the protection of the burner nozzle position,but the flame also has a very high injection intensity.In addition,the optimized burner also improves the swirl strength of the gas.This not only ensures that the gas at the nozzle outlet is fully mixed with the combustion air,but also ensures the stable combustion and burnout of the gas.The purpose of the rapid reduction of the central axis,while making the combustion relatively complete.After the optimized design,the temperature of the new burner rises faster than the original burner,and increases rapidly along the central axis.The peak temperature is closer to the nozzle,and the combustion stabilization effect is better than that of the optimized burner.