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Abstract�� In this thesis,the changes of the circulation-time according to different size particles of the broad size coarse carbamide particles were studied.Experiments were performed in a spouted fluid-bed,with a draft-tube,in different operational parameters.The results show that the different motion tracks of different size particles of broad size materials lead to the different average circulation-time.The motion tracks of large-size particles are shorter than that of little size ones,and accordingly the average circulation-time are shorter with less effects of aeration velocity.In addition,largesize particles grow faster in the granulation experiments of carbamide.

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Received 2006-03-15; published 2006-03-15

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��˷�;��־��;��;Ф��;¬��;.�綯��в�ͬ��ѭ��ʱ��[J]. ��ѧ��ҵ�빤��, 2006,23(2): 121-125

KANG Shi-fang,ZHANG Zhi-guo,LI Guo-bing,XIAO Bin,LU Ling.Circulation-Time of Particles in Spouted Fluid-Bed[J]. Chemcial Industry and Engineering, 2006,23(2): 121-125