Numerical Simulation Of Granulation And Waste Heat Recovery Process For Blast Furnace Slag

Iron and steel industry is a huge consumption of energy and resources industries.As the high temperature of liquid slag, the big accumulation of physical energy, its physics use should be most important energy-saving direction of the iron and steel enterprises and most effective measures to reduce environmental pollution, as well as one of the keys to sustainable development of China's metallurgical industry. Rotary Cup Atomizer for slag granulation and heat recovery technology is one of the effective recoveries of slag physical heat approach.In this paper, the process of Rotary Cup Atomizer for slag granulation and heat recovery technology is analyzed, and put into three parts:The slag breakup process, in-flight solidification process and waste heat recovery process.In this paper, the theories of every part are expatiated, and the fruits of previously scholar are reviewed. Then, every part is simulated numerically with VB6.0 language. Firstly, the fluid of slag film in the cup is analyzed, the equations on the fluid of slag film are list, the film thickness,film lag velocity and film lag percent each place is calculated, the influences of the Cup structure,speed,flux of slag to the film thickness and the film cut speed are discussed; secondly the slag breakup mechanism is analyzed with wave theory,according as the results of the granulation experiment on the olefin and blast furnace slag,the veracity of the model is validated, the influences of speed,flux,viscosity of slag to broken size are discussed;thirdly, the movement and energy equations of the slag in-flight are list, the slag solidification process with inorganic phase change theoretical is simulated, the temperature change rule of the slag in-flight is obtained, the nuclear-rate,the growth rate of different temperature are accounted, the influences of the speed,air temperature,slag initial temperature on the solidification process are discussed; at last, fluidized bed,the fixed bed heat transfer equations are list, dispersed and solved, then the temperature distribution of the fluidized bed and the fixed bed is found, finally temperature changes rule of the slag and gas out the bed aging time is obtained, the influences of the types of bed,air speed,flux of slag,slag size,slag accumulation height to the slag,the air temperature and the recovery energy efficiency are discussed.The results of numerical on the Rotary Cup Atomizer for slag granulation and heat recovery technology can be used as the basis of engineering design.