上海交通大学学报(自然版) ›› 2014, Vol. 48 ›› Issue (11): 1595-1599.

• 化学工业 • 上一篇    下一篇

加压密相气力输送空隙率的实验

鹿鹏1,蒲文灏1,陈晓平2,赵长遂2   

  1. (1.南京航空航天大学 能源与动力学院, 南京 210016;2.东南大学 能源热转换及其过程测控教育部重点实验室, 南京 210096)
  • 收稿日期:2013-09-19
  • 基金资助:

    国家重点基础研究发展规划(973)项目(2010CB227002),江苏省高校优势学科建设项目(PAPD),中央高校基本科研业务费专项资金项目(NS2012084)资助

Experimental Research of Voidage of Pressurized Dense-Phase Pneumatic Conveying

LU Peng1,PU Wenhao1,CHEN Xiaoping2,ZHAO Changsui2   

  1. (1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China)
  • Received:2013-09-19

摘要:

摘要:  在加压密相气力输送中试实验台上进行内蒙烟煤的输送特性实验,考察操作条件和物性参数对空隙率的影响规律.结果表明:提高输送压力有利于实现较低空隙率的输送;随着流化风量的增大,空隙率先减小后增大;补充风量的增大会提高空隙率;随着总差压的增大,52 μm煤粉的空隙率先减小后增大,而115和300 μm煤粉的提升段空隙率持续增大,且同一总差压下,粒径较大煤粉对应的提升段空隙率较小;煤粉水分的增加会降低固相体积流量,同时增大两相流空隙率;随着表观气速的减小,300 μm煤粉的流型从悬浮流向沙丘流转变,管路空隙率逐渐减小.

关键词:  , 加压气力输送; 密相; 空隙率

Abstract:

Abstract: Experiments on the conveying characteristics of Inner Mongolia bituminous coal powder were conducted on a pilotscale pressurized pneumatic conveying test rig. Effects of operational conditions and material properties on the voidage ε were explored respectively. The results indicate that increasing the conveying pressure p is beneficial for conveying at a lower ε. ε initially drops and then grows with the rise in the flow rate of fluidizing gas Qf. Increase of supplemental gas Qsp leads to a higher ε. With the increase of total differential pressure Δp, ε of 52 μm coal decreases at first and then increases marginally, whereas the voidages in the riser section εr of 115 μm and 300 μm coal both rise continually. εr of pulverized coal with larger particle size exhibits a lower voidage at the same Δp. Increase of the moisture content  M of coal results in a lower volumetric flow rate of solids and a higher volidage of the two phase flow. With the decrease of superficial gas velocity Vg, the flow regime of 300 μm coal changes from suspended flow to slug flow, while the volidge in the pipeline εp declines gradually.

Key words: pressurized pneumatic conveying, dense phase, voidage

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