Numerical Simulation On Combustion Behavior In An Anode Baking Furnace Fire Channel

In recent years,China's aluminum electrolysis technology has developed by leaps and bounds.China's aluminum electrolysis equipment level and production technology are changing rapidly,and the technological innovation,energy saving and consumption reduction are fruitful.China has become a major producer of aluminum electrolysis and is heading for a strong aluminum power industry.The quality of anode baking has an important influence on the current efficiency and energy consumption of aluminum electrolysis.Therefore,how to improve the anode baking technology to improve the anode quality has become an important issue in the aluminum electrolysis industry.In this paper,a ring type anode baking furnace used in a factory is taken as the research object.Based on Fluentl4.5 as a computing platform,numerical simulation is used to systematically study the combustion condition of 5P fire chamber under different conditions.According to the symmetry,a solid model of half fire channel is first built,and the grid area is meshed by the structured mesh.The flow model is based on the k-? equation.The Eddy-Diddipation model is adopted in the combustion model,and the P1 radiation model is adopted.In a subsequent study,first discusses the influence of gas flow,the temperature ratio of fire within the field and the species fire passage temperature difference and temperature difference level,then further study the influence on the burning fire volume of air supply duct,the results are as follows:(1)The gas flows along the W-shaped path in the fire channel,which is affected by the pulling of the bricks,and produces a disturbing flow.With the increase of the beta value,the turbulent kinetic energy in the right area of the fire channel increases gradually,while the turbulent kinetic energy on the left side of the fire channel decreases gradually.(2)The flame length of the front and back nozzles is significantly different under different ratios.With the increase of the beta value,the flame at the front fuel nozzle gradually becomes longer,and then the flame length of the nozzle decreases.When the air is not filled,the combustion of CH4 in the whole fire channel is not sufficient,and there are a large number of CH4 unreacted zones.(3)In the case of flue total heat load under the same,with the increase of beta value,heat transfer between hot flue and tank wall is gradually increased,but also showing a trend of fast to slow;both the horizontal temperature difference or vertical temperature differences have a decreasing trend,increasing the beta value,help to reduce the temperature difference in the fire channel.(4)The secondary air volume flow effect of flue gas fire inside is very small,but the temperature field and concentration field are greatly affected.The overall temperature compensation after fire channel increased significantly.With the increase of supplementary air volume,the larger residual area of methane in the flue gradually decreases,and the jet characteristics of combustion flame are very obvious.