固体废弃物在回转窑内混合特性的试验

以固体废弃物为试验物料,在回转窑冷态试验台上,采用示踪粒子的试验方法研究了固体废弃物特性(主要是堆积特性)、回转窑的结构特性(壁面粗糙度、长度及内构件)和操作特性(倾角及转速)等因素对固体废弃物在回转窑内横向混合特性及纵向扩散特性·回转窑转速和料床高度的增加可提高固体废弃物的横向混合速率,纵向扩散速率随着转速和倾角的增加而增加·出口挡板不仅延长了物料在回转窑内的停留时间,而且还使物料的纵向扩散速度大幅下降·纵肋虽然对横向混合的影响不明显,但可加强纵向混合,环肋可使纵向扩散速度下降·较高的壁面摩擦系数使得物料的纵向扩散速度增加·

Experimental Research on the Mixing Characteristics of Solid Waste in Rotary Kiln

The experiments were done on a cool simulated rotary kiln. By introducing tracers, the impact of many factors, such as the characteristics of solid materials (the characteristics of respose in major), structure characteristics (walls coarse degree, length and internal structure), and operating conditions (slope angle and rotational speed), on mixing characteristics of solid materials in rotary kiln were studied. The probability statistics on tracers was adopted to observe the transverse mixing and longitudinal diffusing characteristics. Increasing rotary speed and bed height can improve the transverse mixing rate, and increasing rotary speed and slope angle can increase longitudinal diffusing rate. The outlet dam not only extends the residence time, but also greatly reduces the diffusing rate. Although the longitudinal ribs have not obvious impact on transverse mixing, it can strengthen the longitudinal mixing. The circular rings may weaken longitudinal mixing. A higher wall friction coefficient increases the longitudinal diffusing rate.