Checker Wall Structure And Process Optimization Of Claus Reaction Furnace

The checker wall of Claus furnace can be useful in enhancing gases mixing,increasing the residence time of gases and improving the productivity of sulfur.In order to explore the influence of checker wall on flow,heat transfer and reaction rate,considering Claus furnaces with choke and checker wall,mathematical models were established and numerical simulation of the combustion in the furnace was carried out by Fluent.Advantages of checker wall were explored by using realizable k-?model and component transport equation.Improvements of VectorWall were proposed by analyzing the flow field of the furnace with VectorWall and the advantages of improved checker wall were explored.The productivity of sulfur was improved by optimizing the feeding ratio and feeding temperature of the furnace.The flow field of the furnace was designed by improving the structure of checker wall,and the productivity of sulfur was increased by optimizing the boundary conditions.Therefore,theoretical basis was provided for optimizing the structure of checker wall in this study.Simulation results show that:?1?The simulation results of the furnace with choke agreed very well with on-site data,proving the validity of the mathematical model and simulation scheme.Contrasting the simulation results of the furnace with choke and the furnace with VectorWall,VectorWall could enhance gases mixing,increase the residence time of gases by 0.1 s,improve the temperature field of the furnace and hence improve the productivity of sulfur by 1%.The flow field of the furnace revealed that the location of the choke and VectorWall limited the advantages of them.?2?The improved location VectorWall had a palpable effect on temperature field.It could effectively extend the area of stable temperature by 3 m along the flow stream direction and increase the highest temperature by 72.68 ^oC and the outlet temperature by 13.24 ^oC,enhance gases mixing and increase the residence time of gases by 0.1 s.Extended hole board VectorWall could also improve the residence time of gases and enhance gases mixing.The furnace with double swirl checker wall had a prominent effect on increasing the residence time of gases and enhancing gases mixing.It could accelerate the process of temperature rising and further extend the area of stable temperature by 0.5 m along the flow stream direction.?3?The feeding ratio and feeding temperature were optimized.When the ratio of the additional inlet's feeding rate to the total feeding rate?was equal to 0.3,the mass flow rate of SO₂ reached a minimum and the conversion ratio of SO₂ reached a maximum,and accordingly the productivity of sulfur achieved the biggest promotion space.When the feeding temperature was equal to 600 K,overall considering the improvement of the productivity of sulfur and economic costs,the furnace achieved its optimal result.