Numerical investigation on multi-phase flow reaction characteristics in pyrite fluidized roasters
A numerical simulation study was conducted on the multiphase flow reaction characteristics of pyrite in a fluidized bed roaster using a dual fluid method. Key data such as temperature distribution,component distribution,and reaction rate in the furnace under different operating conditions were obtained,with a focus on analyzing and discussing the influence of gas velocity and wind temperature on reaction rate. The results show that when the inlet velocity increases from 2 m/s to 2.5 m/s,the reaction rate of roasting pyrite in the fluidized bed roaster increases from 8.01 mmol/( m3·s) to 13 mmol/( m3·s) . At the same time,the thickness of the fluidized bed layer increase with the increase of inlet velocity. However,excessive gas velocity may cause solid phase disturbance to the SO2 collection process. Therefore,it is recommended to adjust the inlet velocity to 2.5 m/s;In addition,preheating air temperature plays a promoting role in improving the reaction rate of pyrite in the boiling roasting furnace. When the air temperature increases from 25℃ to 600℃,the average temperature in the furnace increases,and the reaction rate increases from 4.1 mmol/( m3·s) to 6.3 mmol/( m3·s) . This indicates that the more complete the reaction,the lower the residual sulfur rate;When the wind temperature is preheated to 600℃,the local area inside the furnace exceeds 1000℃,causing safety hazards. Therefore,it is recommended to set the preheating temperature between 200～300℃.
万方数据
维普
