作　　者： ; ; ; ;

机构地区： 华南理工大学轻工与食品学院

出　　处： 《化工学报》 2011年第3期685-691,共7页

摘　　要： 引言 由于高浓漂白具有化学传质效率高、消耗蒸汽少等优点,已在造纸工业中被广泛采纳。然而高浓纸浆流动性差,通常在高浓漂白塔塔底需要功率较大的螺旋输送器进行输送,然后再增加稀释单元。因此，研究高浓纸浆降流漂白塔卸料器输送浆料的特征对于节约能源和节省空间以及对卸料器的设计和改进，都将具有很重要的意义。 The instantaneous flow behaviors,i.e.,the average velocity,turbulent kinetic energy and turbulent dissipation of diluted pulp at different planes,were simulated using the granular Eulerian multiphase model that combines the standard k-ε turbulence model with sliding-grid algorithm（SG）technique in FLUENT.The characteristics of pulp flow in the dilution-zone and S-type dischargers with different structures,type-Ⅰ,Ⅱ and Ⅲ,at the bottom of high consistency bleaching tower were analyzed.To validate the model,the image separation and filtration for fiber and water tracer were performed in the particle image velocity（PIV）system and the velocities of fiber and water were measured.The comparison between the experimental data measured by PIV system and the CFD（computational fluid dynamics）simulations indicated that the Eulerian and standard k-ε turbulence models gave a better description for the flow patterns in the dilution-zone of the tower,which provide a good guidance for further study on the discharger.Among the dischargers,the one with type-Ⅰ structure（the ellipse section of 38 mm×50 mm）provides uniform falling of high consistency pulp and rapid discharging for diluted pulp in the dilution zone,in which the turbulent kinetic energy and turbulent dissipation of diluted pulp are greater than those in type-Ⅱ and Ⅲ dischargers,so it is more appropriate for pulp discharging at the bottom of the tower.

关 键 词： 卸料器 计算流体力学 欧拉粒子流模型

领　　域： [轻工技术与工程]