公开(公告)号：US5514307A

公开(公告)日：1996-05-07

申请号：US280245

申请日：1994-07-25

申请人： Arthur R. Shirley, Jr. ,  Phillip A. Forsythe ,  William M. Giles ,  John A. Phillips

发明人： Arthur R. Shirley, Jr. ,  Phillip A. Forsythe ,  William M. Giles ,  John A. Phillips

IPC分类号： B01J2/04 ,  C05C1/02 ,  C05C9/00 ,  C05G3/00

CPC分类号： C05G3/0058 ,  B01J2/04 ,  C05C1/02 ,  C05C9/005

摘要： This invention relates to an improvement in prilling whereby water is atomized into a prill tower to affect faster solidification of the prill, and in particular, the outside surface of the prill by providing an increased rate of surface cooling while reducing the required air flows in the tower. This results in a major reduction in air pollution potential in the form of both fume and particulate while at the same time allowing substantial production rate increases. Specifically, the invention relates to quick freezing the outside surface of the prill by flash evaporation of finely atomized water particles on the surface of the prill or in extremely close proximity to the prill to greatly lower the vapor pressure at the prill's surface and by continued flash evaporation to enhance cooling so as to allow upward flowing air to be reduced to a point where micro-prills which are formed in prilling can settle in the prill tower while obtaining the same or increased production rates. More specifically, the present invention relates to an improvement in melt prilling of water sensitive materials, in particular, ammonium nitrate, urea, potassium nitrate and other water soluble melts which normally absorb water or go into solution readily at ambient conditions in their solid state.

摘要翻译： 本发明涉及造粒的改进，其中水被雾化成造粒塔，以通过提供增加的表面冷却速率来影响颗粒的更快凝固，特别是造粒的外表面，同时减少所需的空气流 塔。 这导致大气中的烟气和微粒形式的空气污染潜力的大幅减少，同时允许大量的生产率增加。 具体而言，本发明涉及通过在颗粒表面上微细雾化的水颗粒的闪蒸或者非常接近于颗粒的方式快速冷冻颗粒的外表面，以大大降低颗粒表面的蒸汽压力并持续闪光 蒸发以增强冷却，以允许向上流动的空气减少到在造粒中形成的微小颗粒可以在获得相同或增加的生产率的同时沉淀在造粒塔中。 更具体地说，本发明涉及水溶性材料，特别是硝酸铵，尿素，硝酸钾和其它水溶性熔体的熔融造粒的改进，其通常在固态环境条件下吸收水或溶解在溶液中。