| 摘要 |
<p>The invention relates to a Close cycle Prilling tower consists of prilling chamber (1) having fluid bed (2) at the bottom. An air circulation blower (3) through Air cooler (4), connected to an inlet for cooling air in prilling chamber through the said fluid bed for air circulation through fluid bed (2), Prilling tower chamber (1) and cyclone separator (5) at air outlet of prilling tower. The said air out let of the prilling chamber passing through the perforated plate located at top of cooling chamber. A multiple spray nozzles provided at top of the said cooling chamber for spraying hot liquid in such a way that the Sprayed liquid and cooling air flow in counter current direction so as to cool hot liquid droplets in contact with jet of cold air are cooled and solidify when comes and fall down on fluidised bed (2) at the bottom of chamber. The fine particle outlet of said cyclone is connected to the said cooling chamber at bottom. A control means for air velocity /r/ cooling chamber (1) to be maintained in such a way that all particles below desired particle size are carried to cyclone (5) while particles above desired size fall in fluid Bed (2). A hot liquid tank holding the liquid to be sprayed (10) located on top of cooling chamber. A feed tank (13) on ground level, as a hold up tank. .provided with pump means to pump Liquid constantly to hot liquid tank using pump (14) and an over flow pipe means for returning the liquid to the said feed tank to maintain a constant level in the said hot liquid tank. A discharge weir pipe with rotary valve provided in the fluid bed for collecting the cooled powder of particles above desired size, fell in fluid bed. REFERENCE FIGURE 1</p> |
