A contactor vessel was built to operate as either a mechanically or a conventional spouted bed for the purpose of analyzing the drying of pasty and granular materials under comparable conditions in both configurations. A classical conical–cylindrical spouted bed with a 60° conical base and an air inlet central orifice was modified to enable the switch by introducing in the vessel’s center an open helicoidal conveyor screw placed above the air inlet orifice. This screw is removable and conveniently returns the bed to its conventional spouted configuration. Experiments on drying solutions (calcium carbonate suspensions and skimmed milk) and granular materials (porous alumina particles) were performed for various bed parameter settings. The spouting pressure drop, outlet air temperature, and relative humidity were measured over time under different conditions. Mechanical agitation is proved effective in drying diluted carbonate calcium liquid suspensions and coarse porous alumina particles at an air velocity approximately 50% lower in comparison to drying in a conventional spouted bed. The conventional spouted bed performed better at drying liquid skimmed milk as the mechanical agitation combined with the axial inlet air flow is not effective in mitigating sticking and powder agglomeration in the bed when handling pastes of complex composition. Introducing mechanical agitation in the designed setup broadens the operating range of a conventional spouted bed with axial air flow in the inlet.

为了分析两种配置下可比较条件下糊状和颗粒状物料的干燥，建立了一个接触器容器，使其既可以用作机械床，也可以用作常规的喷射床。修改了一个经典的圆锥形-圆柱形喷射床，该圆锥形基座具有60°的圆锥形底座和一个进气口中央孔，通过在容器中心引入一个位于进气口上方的敞开式螺旋输送机螺杆来进行切换。该螺钉是可拆卸的，可方便地使床恢复到其常规的带嘴构造。针对各种床参数设置，进行了干燥溶液（碳酸钙悬浮液和脱脂牛奶）和粒状材料（多孔氧化铝颗粒）的实验。喷头压降，出风温度，在不同条件下随时间测量相对湿度和相对湿度。事实证明，与传统的喷射床干燥相比，机械搅拌可有效地干燥稀释的碳酸盐钙液体悬浮液和粗大的多孔氧化铝颗粒，风速低约50％。传统的喷射床在干燥液态脱脂牛奶方面表现更好，因为在处理复杂成分的糊剂时，机械搅拌与轴向进气流相结合并不能有效缓解床中的粘着和粉末团聚。在设计的装置中引入机械搅拌，可扩大传统喷射床的操作范围，并在进气口提供轴向气流。事实证明，与传统的喷射床干燥相比，机械搅拌可有效地干燥稀释的碳酸盐钙液体悬浮液和粗大的多孔氧化铝颗粒，风速低约50％。传统的喷射床在干燥液态脱脂牛奶方面表现更好，因为在处理复杂成分的糊剂时，机械搅拌与轴向进气流相结合并不能有效缓解床中的粘着和粉末团聚。在设计的装置中引入机械搅拌，可扩大传统喷射床的操作范围，并在进气口提供轴向气流。事实证明，与传统的喷射床干燥相比，机械搅拌可有效地干燥稀释的碳酸盐钙液体悬浮液和粗大的多孔氧化铝颗粒，风速低约50％。传统的喷射床在干燥液态脱脂牛奶方面表现更好，因为在处理复杂成分的糊剂时，机械搅拌与轴向进气流相结合并不能有效缓解床中的粘着和粉末团聚。在设计的装置中引入机械搅拌，可扩大传统喷射床的操作范围，并在进气口提供轴向气流。传统的喷射床在干燥液态脱脂牛奶方面表现更好，因为在处理复杂成分的糊剂时，机械搅拌与轴向进气流相结合并不能有效缓解床中的粘着和粉末团聚。在设计的装置中引入机械搅拌，可扩大传统喷射床的操作范围，并在进气口提供轴向气流。传统的喷射床在干燥液态脱脂牛奶方面表现更好，因为在处理复杂成分的糊剂时，机械搅拌与轴向进气流相结合并不能有效缓解床中的粘着和粉末团聚。在设计的装置中引入机械搅拌，可扩大传统喷射床的操作范围，并在进气口提供轴向气流。