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浙江大学学报（农业与生命科学版）
Journal of Zhejiang University (Agriculture and Life Sciences)  2022, Vol. 48 Issue (1): 117-124    DOI: 10.3785/j.issn.1008-9209.2021.02.251
Agricultural engineering     
Numerical simulation of the filtration and sewage processes of horizontal self-cleaning mesh filter
Yan XIE1(),Zhenji LIU1(),Jie LI1,Quanli ZONG1,2,Jin JIN1,Kai SHI1
1.College of Water & Architectural Engineering, Shihezi University, Shihezi 832000, Xinjiang, China
2.College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, Shandong, China
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Abstract  

In order to study the change rule of the internal flow field of the self-cleaning mesh filter with different inlet flow rates during the filtration and sewage processes, we used Fluent software to carry out the numerical simulation of the clear-water flow field for the filtration and sewage processes of the self-cleaning mesh filter, and obtained the pressure field and velocity field at the different inlet flow rates. Comparing the numerical simulation results with the physical test results, the relative error was within 10%, which confirmed the reliability of the numerical simulation. Meanwhile, the results of the numerical simulation showed that the higher the water flow rate was, the more violent the mixing of water was in the tank and the sewage system, which could reduce the sedimentation and help to improve the filtration and sewage effects. Moreover, with the increase of the inlet flow rate, the pressure difference between the inlet and outlet of the tank and the sewage system increased, and the head loss also increased, and the requirement for the stability of the filter structure was higher. The above research results can provide a reference for the optimization of the horizontal self-cleaning mesh filter structure.

Key words： self-cleaning mesh filter      filtration process      sewage process      numerical simulation      head loss     
Received: 25 February 2021      Published: 04 March 2022
CLC:  S 277.9  
Corresponding Authors: Zhenji LIU     E-mail: 1152370834@qq.com;shz_lzj@163.com
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Yan XIE
Zhenji LIU
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Quanli ZONG
Jin JIN
Kai SHI
Cite this article:

Yan XIE,Zhenji LIU,Jie LI,Quanli ZONG,Jin JIN,Kai SHI. Numerical simulation of the filtration and sewage processes of horizontal self-cleaning mesh filter. Journal of Zhejiang University (Agriculture and Life Sciences), 2022, 48(1): 117-124.

URL:

https://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2021.02.251     OR     https://www.zjujournals.com/agr/Y2022/V48/I1/117


卧式自清洗网式过滤器过滤及排污过程的数值模拟

为了研究卧式自清洗网式过滤器在不同进水流速下过滤和排污过程中内部流场的分布规律，利用Fluent软件对卧式自清洗网式过滤器的过滤和排污过程进行清水流场的数值模拟，得到不同进水流速下的压强场和速度场，并将模拟结果与试验结果对比，二者相对误差在10%以内，证实了数值模拟的可靠性。数值模拟结果表明，进水流速越大，罐体和排污系统内的水流掺混越剧烈，可减少泥沙淤积，有助于提高过滤和排污效果，但随着进水流速的增大，罐体和排污系统的进出口压强差随之增大，其水头损失也增大，对过滤器结构稳定性要求也越高。上述研究结果可为卧式自清洗网式过滤器结构优化提供参考依据。


关键词： 自清洗网式过滤器,  过滤过程,  排污过程,  数值模拟,  水头损失 
Fig. 1 Structural diagram of self-cleaning mesh filter and flow chart of filtration and sewage processesA. Filtration system; B. Sewage system. 1: Inlet; 2: Outlet; 3: Pressure gauge; 4: Fine filter; 5: Tank; 6: Coarse filter; 7: Sand suction component; 8: Rotary nozzle outlet; 9: Rotary nozzle; 10: Electromagnetic valve; 11: Sewage outlet; 12: Sand discharge pipe.

系统

System

组件

Component

内径（宽度）

Inradium (width)/mm

长度

Length/mm

排污系统

Sewage

system

排沙管 Sand discharge pipe60960
吸沙组件 Sand suction component50400
旋喷管 Rotary nozzle60280
矩形吸沙口 Rectangular sand suction port(20)400
旋喷口 Rotary spout30

吸沙组件与排沙管轴线距离 Distance between the sand suction

component and the axis of sand discharge pipe

200

各吸沙组件中心点垂直距离 Vertical distance of the center

point of each sand suction component

200
排污管 Sewage pipe100300

过滤系统

Filtration

system

进水管 Inlet pipe160300
出水管 Outlet pipe160300
罐体 Tank3001 170
分流口 Shunt12020
Table 1 Summary table of design parameters of sewage system and filtration system
Fig. 2 Grid division of three-dimensional models of tank (A) and sewage system (B)

工况

Working

condition

实际进水流速

Actual inlet

flow rate/(m/s)

实际进水流量

Actual inlet

flow/(m3/h)

出水口压强

Outlet pressure/

Pa

10.169128 510
20.695509 580
30.833609 700
41.1128011 010
51.3669911 110
61.51711011 310
72.08315112 840
Table 2 Boundary conditions of the inlet and outlet

工况

Working

condition

实际进水流量

Actual inlet

flow/(m3/h)

进水口压强

Inlet pressure/Pa

出水口压强

Outlet pressure/Pa

水头损失 Head loss

物理试验

Physical test/m

数值模拟

Numerical simulation/m

相对误差

Relative error/%

11214 2708 5100.6370.5769.60
25016 8909 5800.7950.7318.05
36017 6709 7000.8770.7979.12
48020 1701 1011.0090.9169.22
59923 02011 1101.3161.1919.50
611024 89011 3101.4991.3589.41
715133 29012 8402.2642.0459.67
Table 3 Result comparisons of head loss between numerical simulation and physical test
Fig. 3 Pressure cloud diagrams of different planes of the self-cleaning mesh filter at different flow ratesA. Inlet flow rate is 0.695 m/s; B. Inlet flow rate is 1.366 m/s; C. Inlet flow rate is 2.083 m/s.
Fig. 4 Velocity cloud diagrams of different planes of the self-cleaning mesh filter at different inlet flow ratesA. Inlet flow rate is 0.695 m/s; B. Inlet flow rate is 1.366 m/s; C. Inlet flow rate is 2.083 m/s.
Fig. 5 Pressure cloud diagrams of the sewage system at different flow rates
Fig. 6 Velocity cloud diagrams of the sewage system at different flow rates
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