Abstract:To address the problems of single distributed air ring with holes having limited influence on distribution of matte particles, a new design of double distributed air rings with staggered holes was proposed. Remain the original structure and size, and add another layer of distributed air ring which is in staggered display with the existing one. The above modification can not only increase outlet area, but also make up the uneven effect of distributed air on matte particles. Meanwhile, numerical simulation of different distributed air flow rate (i.e. 1 000 m3/h and 1 500 m3/h in total) and different structures were carried out to find the optimization structure and corresponding parameters. It is found that the double distributed air rings can improve reaction rate of matte particles, but adding the vertical downward angle would lead to ignition delay of matte particles. Therefore, it is recommended that, keeping double distributed air rings with only horizontal deflection angle and increasing distributed air flow rate to 1500 m3/h can improve the reaction rate of matte particles.