A simulation model for settling tanks with varying cross-sectional area

被引：13

作者：

Burger, Raimund ^{[1
]}

Careaga, Julio ^{[1
,2
]}

Diehl, Stefan ^{[2
]}

机构：

[1] Univ Concepcion, Dept Ingn Matemat, Fac Ciencias Fis & Matemat, Ctr Invest Ingen Matemat, Concepcion, Chile

[2] Lund Univ, Ctr Math Sci, Lund, Sweden

来源：

CHEMICAL ENGINEERING COMMUNICATIONS | 2017年 / 204卷 / 11期

关键词：

Clarifier-thickener; continuous sedimentation; nonlinear conservation PDE; numerical method; secondary clarifier; WASTE-WATER TREATMENT; ADOMIAN DECOMPOSITION METHOD; DIMENSIONAL CLARIFIER MODEL; CONTINUOUS SEDIMENTATION; FLOCCULATED SUSPENSIONS; DISCONTINUOUS FLUX; CONSERVATION LAW; STEADY-STATE; FLOW; VESSELS;

D O I：

10.1080/00986445.2017.1360871

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A quasi-one-dimensional model of the process of continuous sedimentation in clarifier-thickeners (settlers) with variable cross-sectional area is presented. The partial differential equation (PDE) model extends the settler model advanced by Burger et al. (2013), which assumes a constant cross section. A reliable numerical method that handles the special features of the nonlinear PDE is presented along with an advantageous time-step condition for continuous and batch sedimentation under the condition of a variable cross-sectional area. Simulations of continuous sedimentation show the effect of change of cross-sectional area in the concentration inside the vessel and in the underflow. Simulations of batch settling in cones illustrate the versatility of the numerical scheme to include a vertex, where the area shrinks to zero.

引用

页码：1270 / 1281

页数：12

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