回转窑供风管参数对窑内热工状况的影响

以2.3 m×55 m的炭素回转窑作为研究对象，应用流体模拟软件Fluent 和Matlab 分别对其气体空间和物料料层内的传热过程进行了研究。通过改变二、三次供风管的长度和供风管入口处的空气吹向，得到了相应条件下窑内的温度分布，并进行了比较和分析。结果表明：二、三次供风管的长度对窑内温度场的影响较小，实践中可以采用无管供风措施，以解决供风管道烧损问题；当二、三次供风管在某一长度下窑内煅烧带温度较高时，其窑内剩余的可燃气体较低；二、三次供风管入口处空气均吹向窑头时，窑尾处剩余可燃气体浓度较大，但其煅烧带温度较高，煅烧带长度较长；当二、三次供风管入口处空气均吹向窑尾时，窑尾处剩余可燃气体浓度较小，但其煅烧带温度较低，煅烧带长度较短。

Influences of air pipe parameters on thermal working conditions in carbon rotary kilns

Taking a 2.3 m×55 m carbon rotary kiln for example, numerical simulations were conducted on gas and solid spaces of the kiln by using Fluent and Matlab softwares. Through changing air pipe length and air flow of secondary and tertiary air, temperature field distributions and gas concentration distributions were obtained under different conditions. The results indicated that air pipe length had insignificant influence on kiln temperature, so air could be supplied without pipe in practical engineering to resolve the burning out of air pipe. When the length of air pipe equaled a specific value, kiln temperature was up to a higher temperature. At the same time, the concentration of the remaining combustible gas was lower under that condition. As the secondary and tertiary air flowed to the kiln outlet, the remaining combustible gas was higher at the kiln inlet, but the temperature of the calcining zone was higher, and the length of the calcining zone was longer.  Conversely, the remaining combustible gas was lower at the kiln inlet, the temperature of the calcining zone was lower, and the length of the calcining zone was shorter as the secondary and tertiary air flowed to the kiln inlet.