摘要
在自建的气力输送系统上，进行了高固气比状态下粉煤气力输送研究．分别在内径为15、20、32mm的管道中进行了输送实验，考察了操作参数对粉煤质量流量、固气比、表观气速等气力输送特征参数的影响．结果表明，输送固气比达到200～580kg·kg^-1；随气体流量增加，粉煤的质量流量增大，而固气比降低；与输送压力的影响相比，管径对粉煤质量流量的影响程度更为显著；给出了基于本系统描述各参数之间相互关系的经验方程，表明较小的气量和较大的输送管径更有利于实现高固气比状态下的粉煤气力输送．
High solids loading pneumatic conveying of pulverized coal was achieved in a new pneumatic conveying system where solid/gas mass flow ratio reached 200-580 kg·kg^-1. Operation conditions, including transport pressure, gas volume and pipe diameter were specially designed for the conveying system with pipelines of 15 mm, 20 mm, 32 mm （I.D.） respectively. The effects of different operation conditions on the characteristic parameters, i.e. mass flow rate, solid/gas mass flow ratio and superficial gas velocity, as well as the relationships within the operation conditions themselves, were investigated in the experiments. It was found that under a higher pressure a greater supply of gas was needed, which resulted in greater conveying capacity. However, solid/gas mass flow ratio declined dramatically when solid mass rate increased. The analysis of the experiment also revealed that pipeline diameter was actually the crucial element which brought about great difference in conveying capacity in contrast to the results from the change of operation pressure. Some empirical expressions were finally established which were capable of describing the relationship between the aforementioned parameters and again pipe diameter played an important role. The expressions additionally revealed that gas supply surged with the increase of pulverized coal mass flow rate. The quantitative relations of the parameters might be system-dependent, but this paper presents useful information and approach to pneumatic conveying.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第3期640-644,共5页
CIESC Journal
基金
教育部科技重点项目(104247)
国家重点基础研究发展计划项目(2004CB217702)~~
关键词
气力输送
高固气比
粉煤
pneumatic conveying
high solids loading
pulverized coal
