气力输送Y型分支管网流动阻力特性的研究

Research on Resistance Properties for Y Type Branch Pipe in Pneumatic Conveying Process

在水平Y型分支管道中采用压缩空气作为动力,粒径为2mm的小米为输送物料进行气力输送试验。对气固两相分支管道各自的压力损失及两分支管间压力损失差值的变化规律进行了研究。试验表明,当气体表观速度下降时,两分支管的压力损失值减小;当气体表观速度低于沉积速度后,继续降低气速,各支管单位长度压力损失将增大,但两分支管上压力损失变化不同步。当两分支管与主管中轴线夹角的差值变大时,两分支管压力损失曲线及两分支管压力损失差曲线在气体高速区远离,在低速区靠近。同时,利用主成分分析法得出了影响两支管单位长度压损差值的主要因素是变动支与主管中轴线夹角、气体表观速度。

Gas-solid flow experiment of average particle diameter 2mm millet is carried out using compress air at horizontal Y type branch pipe . Resistance property of each branch and the law of pressure drop differential change are described in the article. The result shows when the superficial gas velocity draws down, the pressure drop on each branch and the pressure drop D-value of the two branch decrease firstly. And when the superficial gas velocity reduces to deposition velocity , the respective pressure drop begin to rise. But pressure drop of each pipe changes differently. With the difference value rising of the angel between the changeable branch and the main pipe, it is found that the pressure drop curve of each branch and the pressure drop D-value of the two branch are away from each other in high gas velocity zone, while become near in low gas velocity zone. Meanwhile, principal component analysis method is adopted to explore the importance of influencing factors and their correlation. The experimental consequence shows that the angel between changed branch and main pipe axis and superficial gas velocity are chief influencing factors.