细砂在曝气除砂设备中的流动特性与沉降模拟-学报杂志社

期刊信息

合肥工业大学（自然科学版），2025年7月，第48卷第7期：989-995

DOI: 10.3969/j.issn.1003-5060.2025.07.020

作者信息

侯锋 $ ^{1} $，刘莹 $ ^{1} $，千里里 $ ^{1} $，周晓 $ ^{1} $，刘艳臣 $ ^{2} $，范茏 $ ^{3} $

（1. 国投信开水环境投资有限公司，北京 101101；2. 清华大学环境学院，北京 100080；3. 合肥大学能源材料与化工学院，安徽合肥 230601）

摘要和关键词

摘要: 文章采用计算流体力学(computational fluid dynamics, CFD)的方法，对同时含有50、60 $ \mu $m这2种砂的新型曝气除砂一体化设备进行数值模拟，探讨其流体力学特性和颗粒沉降规律。结果表明：模拟去除率与理论计算值一致，证明模拟结果的可靠性；无曝气时50 $ \mu $m颗粒的质量浓度分布和去除率与60 $ \mu $m颗粒有所差异，可能是一体化的集成设计放大了颗粒直径的影响；曝气的引入消除了2种颗粒在质量浓度分布、去除率等方面的差别，增大了去除率，50、60 $ \mu $m颗粒的平均去除率分别从无曝气时的77.9%、86.4%同时增大到95.0%，且去除率随时间变化更缓和；气水比从0.1增大到0.4时去除率没有明显提高，反而带来波动和能耗的增加。该新型设备对100 $ \mu $m以下小颗粒的去除率明显优于现有曝气沉砂池，为后续生化池的高效稳定运行奠定基础。

关键词: 除砂；计算流体力学(CFD)；精细砂粒；去除率；颗粒粒径

Authors

HOU Feng $ ^{1} $, LIU Ying $ ^{1} $, GAN Lili $ ^{1} $, ZHOU Xiao $ ^{1} $, LIU Yanchen $ ^{2} $, FAN Long $ ^{3} $

(1. SDIC Xinkai Water Environment Investment Co., Ltd., Beijing 101101, China; 2. School of Environment, Tsinghua University, Beijing 100080, China; 3. School of Energy Materials and Chemical Engineering, Hefei University, Hefei 230601, China)

Abstract and Keywords

Abstract: In this paper, a new type of integrated aerated sand removal equipment with two fine sand particles (50 $ \mu $m and 60 $ \mu $m) was numerically simulated using computational fluid dynamics (CFD) method to investigate its hydrodynamic characteristics and particle sedimentation patterns. The results showed that the modeled removal rates were in good agreement with the theoretical values, which proved the reliability of the simulation. Without aeration, the solid distribution and removal rate of particles of 50 $ \mu $m differed from those of particles of 60 $ \mu $m. This may come from the amplified effect of diameter difference due to the integrated structure. The inclusion of aeration removed the difference of solid distribution and removal rate between two particles. Meantime, the removal rates were increased. The average removal rates of 50 $ \mu $m and 60 $ \mu $m particles were increased from 77.9% and 86.4% to 95.0%, respectively. The variation in removal rate over time became more stable. The increment of the ratio of gas to liquid from 0.1 to 0.4 did not enhance the removal rate, but brought fluctuation and energy cost. Compared to the conventional aerated grit chambers, this new integrated equipment achieves markedly higher removal rate for particles below 100 $ \mu $m, which lays a foundation. for the efficient and stable operation of biochemical ponds.

Keywords: sand removal; computational fluid dynamics(CFD); fine sand particles; removal rate; particle size

基金信息

国家自然科学基金资助项目（52270091）；安徽省重点研究和开发计划资助项目（202204a05020077）和安徽省教育厅重点资助项目（KJ2021A1015）

合肥工业大学学报(自然科学版)

导航菜单

细砂在曝气除砂设备中的流动特性与沉降模拟