摘要
通过对粗聚丙烯和瓷球两种Geldart-D类颗粒漏斗-立管系统实验研究,发现在悬料操作区域内,漏斗-立管系统具有较高的抗压能力。因此,把在悬料条件下具有抗压特征的漏斗-立管系统(无机械转动部件阀门)称之为“颗粒塞阀”。颗粒塞阀的抗压下限可由下式 ()22mfgmfgmf24oomf233tsptmfmfsp300(1)()(1)d()7.0()dUUDDplDdDdemrefeef---=+ 沿立管高度积分求得;而抗压上限是由Ergun公式沿立管高度积分求得,但计算所用的气速是指此系统的漏斗中颗粒的有效重量等于气固之间作用的曳力时所对应的立管中气速。并指出了此阀可用于把颗粒从低压容器输送到高压容器的场合。
In the hopper-standpipe system, experiments were carried out to study the hung-up regime for coarse polypropylene and ceramic ball particles, which belong to Geldart-D powder. The system in the hung-up regime is named as the Particle Plug Valve because of its characteristics of high anti-pressure. The incipient condition of anti-pressure of particle plug valve could be obtained by integrating the ddpl differential equation along the height of the standpipe. However, the terminal condition could be obtained by integrating the Ergun equation along the height of the standpipe, where the gas velocity used refers to that in the standpipe when the buoyancy force exerted on the entire particle bed by fluid flowing upwards equals to the effective gravitational force of all particle in the hopper of the system. The particle plug valve can be used when the particles are conveyed from the low-pressure vessel to the high-pressure one.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2004年第5期571-578,共8页
Journal of Chemical Engineering of Chinese Universities
