摘要
流化床撞击流气流粉碎是对矿物进行超细粉碎的重要方法,喷管是其最关键部件之一。根据流体力学理论对流化床气流粉碎喷管进行了研究,提出了轴对称撞击流速度势函数表达式和喷管直径变化方程,并根据相关理论对超声速拉瓦尔喷管进行了设计和制造。实验证明,采用该喷管对煤进行超细粉碎,在喷管入口压力为0.7 MPa^1.0 MPa、转速分级轮转速>2 400 r/m in条件下,粉碎产品中以粒径小于2μm的颗粒为主,对煤具有良好的超细粉碎效果。
Fluidized bed pneumatic jet grinding is an important method in superfine grinding, the nozzle is the key part of the machine. In the paper, the study of the nozzle is done based on fluid mechanics. The equations of the fluid flow and the nozzle diameter are established and a new nozzle has been designed. It is proved that a well superfine smash of coal could be reached using the nozzles; the coal particle size is less than 2μm.
出处
《机械制造与自动化》
2007年第6期71-72,82,共3页
Machine Building & Automation
基金
国家自然科学基金重大研究计划重点项目"西部煤炭能源高效干法分选洁净的基础研究"(No:90210035)
关键词
流化床
撞击流
气流
超细粉碎
拉瓦尔喷管
fluidized-bed
bump flow
pneumatic
superfine smash
Laval nozzle
