# Research on the Deposition Characteristics of Integrated Prefabricated Pumping Station

^{1}

^{2}

^{3}

^{4}

^{5}

^{*}

## Abstract

**:**

_{1}was longer. With the decrease of the flow rate and the increase of the particle diameter, the following feature of the particle decreased, and it was easier to impact the walls and edges, which caused long-term deposition. The research results could provide some suggestions for the design of anti-deposition performance of prefabricated pumping station.

## 1. Introduction

## 2. Material and Methods

#### 2.1. Research Model

_{0}was 1200 mm, inlet pipe diameter D was 100 mm, inlet pipe height H

_{0}was 820 mm. Design scale of the pump station Q was 84 m

^{3}/h, two submersible sewage pumps were used, the design flow rate of the single pump Q

_{d}was 42 m

^{3}/h, the head of the pump H was 10 m, and the rotation speed of the pump n was 1480 r/min.

#### 2.2. Grid Generation

#### 2.3. Calculation Method of the Internal Flow Field

#### 2.4. Setting of DPM and Calculation Method of Deposition Rate

^{2}, the density of the particle was 1200 kg/m

^{3}, the diameter of particle is 6 mm, and the volume fraction was 1%.

#### 2.5. The Calculation Formula of the Deposition Rate

_{t}and the number of outgoing particles N

_{e}could be obtained. The calculation formula of the deposition rate was as follows.

#### 2.6. Research Scheme and Analysis Method of the Movement Trajectory of Single Particle

#### 2.6.1. Research Scheme

#### 2.6.2. Analysis Method of Movement Trajectory of Single Particle

## 3. Results

#### 3.1. Numerical and Experimental Results

#### 3.2. Deposition Characteristics under Different Flow Rates

#### 3.2.1. Internal Flow Field

#### 3.2.2. Movement Trajectories and Deposition Rate of Particles

_{d}, after the particles accumulated on the vertical barrier weir, the particles moved downward from two sides and deposited on the side walls. As the flow rate increased, the movement area of the particles was enlarged. As the distribution of the two submersible pumps and the pump pit were not completely symmetrical, the particles moved more to the right side. Due to the low velocity region in the YZ plane of the separated prefabricated pumping station being symmetrically distributed, it could be inferred that there were more depositions on the right side of the vertical barrier weir.

_{d}, the deposition rate of numerical simulation was 78.6% and that of the experimental measurement was 51.3%, with a standard deviation of 27.3%. Under 1.0Q

_{d}, the deposition rate of numerical simulation was 25.4% and that of the experimental measurement was 22.3%, with a standard deviation of 3.1%. Under 1.4Q

_{d}, the deposition rate of the numerical simulation was 22.7% and that of the experimental measurement was 12.3%, with a standard deviation of 10.4%.

#### 3.3. Deposition Characteristics at Different Particle Diameters

#### 3.3.1. Internal Flow Field

#### 3.3.2. Movement Trajectories and Deposition Rates of Particles

#### 3.4. Deposition Characteristics at Different Liquid Levels

#### 3.4.1. Internal Flow Field

#### 3.4.2. Movement Trajectory and Deposition Rate of Particles

#### 3.5. Deposition Characteristics under Single/Dual Pump Operation

#### 3.5.1. Internal Flow Field

#### 3.5.2. Movement Trajectories and Deposition Rate of Particles

#### 3.5.3. Deposition during a Right Pump Operation

_{d}, the deposition rate of numerical simulation was 76.7% and that of experimental measurement was 53.6%, with a standard deviation of 23.1%. Under 1.0Q

_{d}, the deposition rate of numerical simulation was 45.3% and that of experimental measurement was 36.7%, with a standard deviation of 8.6%. Under 1.4Q

_{d}, the deposition rate of numerical simulation was 39.1% and that of experimental measurement was 21.3%, with a standard deviation of 17.8%. As the flow rate increased, the deposition rate of the separated prefabricated pumping station decreased.

#### 3.6. Movement Trajectories of Particles at the Bottom of the Pump pit under Closing Inlet Valve

_{1}(−500, 100, 0), N

_{2}(−500, 0, 0), and N

_{3}(−500, −100, 0), respectively.

#### 3.6.1. Movement Trajectories of a Single Particle under Different Flow Rates

_{1}had a longer moving path and was more likely to hit the wall and stagnate. As the flow rate increased, the following feature of the particle increased, and the particle basically moved to the pre-whirling basin with the fluid. The smaller the flow rate, the closer was the movement of the particles to the inner wall surface of the pre-whirling basin. The edges and corners between the pre-whirling basin and the vertical barrier weir made it easier to stall the particles.

#### 3.6.2. Movement Trajectories of a Single Particle under Different Particle Diameters

## 4. Discussion

_{1}was weakened between the flowability of the particles.

## 5. Conclusions

## Author Contributions

## Funding

## Conflicts of Interest

## References

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**Figure 3.**Experimental particles: (

**a**) Spherical particles of different diameter; and (

**b**) rubber particles coated with fluorescent materials.

**Figure 4.**Recognition process of the movement trajectory of particles: (

**a**) Original image; (

**b**) highlight the particle color component; (

**c**) remove background; and (

**d**) make movement trajectories.

**Figure 6.**Velocity distributions and streamlines in the XZ plane under different flow rates: (

**a**) 0.6Q

_{d}; (

**b**) 0.8Q

_{d}; (

**c**) 1.0Q

_{d}; (

**d**) 1.2Q

_{d}; and (

**e**) 1.4Q

_{d}.

**Figure 7.**Velocity distributions and streamlines in the YZ plane under different flow rates: (

**a**) 0.6Q

_{d}; (

**b**) 0.8Q

_{d}; (

**c**) 1.0Q

_{d}; (

**d**) 1.2Q

_{d}; and (

**e**) 1.4Q

_{d}.

**Figure 8.**Volume fractions of particles in XZ plane under different flow rates: (

**a**) 0.6Q

_{d}; (

**b**) 0.8Q

_{d}; (

**c**) 1.0Q

_{d}; (

**d**) 1.2Q

_{d}; and (

**e**) 1.4Q

_{d}.

**Figure 9.**Volume fractions of the particles in the YZ plane under different flow rates: (

**a**) 0.6Q

_{d}; (

**b**) 0.8Q

_{d}; (

**c**) 1.0Q

_{d}; (

**d**) 1.2Q

_{d}; and (

**e**) 1.4Q

_{d}.

**Figure 10.**Movement trajectories of the particles under different flow rates: (

**a**) 0.6Q

_{d}; (

**b**) 0.8Q

_{d}; (

**c**) 1.0Q

_{d}; (

**d**) 1.2Q

_{d}; and (

**e**) 1.4Q

_{d}.

**Figure 12.**Velocity distributions and streamlines on the XZ plane at different particle diameters: (

**a**) 6 mm; (

**b**) 8 mm; and (

**c**) 10 mm.

**Figure 13.**Velocity distributions and streamlines on the YZ plane at different particle diameters: (

**a**) 6 mm; (

**b**) 8 mm; and (

**c**) 10 mm.

**Figure 14.**Volume fractions of particles on the XZ plane at different particle diameters: (

**a**) 6 mm; (

**b**) 8 mm; and (

**c**) 10 mm.

**Figure 15.**Volume fractions of particles on the YZ plane at different particle diameters: (

**a**) 6 mm; (

**b**) 8 mm; and (

**c**) 10 mm.

**Figure 16.**Movement trajectories of the particles at different particle diameters: (

**a**) 6 mm; (

**b**) 8 mm; and (

**c**) 10 mm.

**Figure 18.**Velocity distributions and streamlines on the XZ plane at different liquid levels: (

**a**) 900 mm; (

**b**) 1050 mm; (

**c**) 1200 mm; (

**d**) 1350 mm; and (

**e**) 1500 mm.

**Figure 19.**Velocity distributions and streamlines on the YZ plane at different liquid levels: (

**a**) 900 mm; (

**b**) 1050 mm; (

**c**) 1200 mm; (

**d**) 1350 mm; and (

**e**) 1500 mm.

**Figure 20.**Volume fractions of the particles on the XZ plane at different liquid levels: (

**a**) 900 mm; (

**b**) 1050 mm; (

**c**) 1200 mm; (

**d**) 1350 mm; and (

**e**) 1500 mm.

**Figure 21.**Volume fractions of particles on the YZ plane at different liquid levels: (

**a**) 900 mm; (

**b**) 1050 mm; (

**c**) 1200 mm; (

**d**) 1350 mm; and (

**e**) 1500 mm.

**Figure 22.**Movement trajectories of particles at different liquid levels: (

**a**) 900 mm; (

**b**) 1050 mm; (

**c**) 1200 mm; (

**d**) 1350 mm; and (

**e**) 1500 mm.

**Figure 24.**Velocity distributions and streamlines on the XZ plane under single/dual pump operation: (

**a**) Right pump operation; (

**b**) double pump operation; and (

**c**) left pump operation.

**Figure 25.**Velocity distributions and streamlines on the YZ plane under single/dual pump operation: (

**a**) Right pump operation; (

**b**) double pump operation; and (

**c**) left pump operation.

**Figure 26.**Volume fractions of particles on the XZ plane under single/dual pump operation: (

**a**) Right pump operation; (

**b**) double pump operation; and (

**c**) left pump operation.

**Figure 27.**Volume fractions of particles on the YZ plane under single/dual pump operation: (

**a**) Right pump operation; (

**b**) double pump operation; and (

**c**) left pump operation.

**Figure 28.**Movement trajectories of the particles under a single/double pump operation: (

**a**) Right pump operation; (

**b**) double pump operation; and (

**c**) left pump operation.

**Figure 30.**Movement trajectories of particles during the right pump operation: (

**a1**) 0.6Q

_{d}; (

**a2**) 0.8Q

_{d}; (

**a3**) 1.0Q

_{d}; (

**a4**) 1.2Q

_{d}; (

**a5**) 1.4Q

_{d}; (

**b1**) 6 mm; (

**b2**) 8 mm; (

**b3**) 10 mm; (

**c1**) 900 mm; (

**c2**) 1050 mm; (

**c3**) 1200 mm; (

**c4**) 1350 mm; and (

**c5**) 1500 mm.

**Figure 31.**Comparison of the deposition rate during right pump operation under different flow rates.

**Figure 32.**Comparison of the deposition rate during right pump operation under different particle diameters.

**Figure 33.**Comparison of the deposition rate during right pump operation under different liquid levels.

No. | Grid Number | Head/m |
---|---|---|

1 | 1469146 | 10.57 |

2 | 2143569 | 10.38 |

3 | 2672990 | 10.32 |

Scheme | Particle Diameter/mm | Flow Rate/m^{3}·h^{−1} | Liquid Level/mm | Pump Operation |
---|---|---|---|---|

1 | 6 | 0.6/0.8/1.0/1.2/1.4 Q_{d} | 1200 | Dual pumps |

2 | 6,8,10 | 1.0Q_{d} | 1200 | Dual pumps |

3 | 6 | 1.0 Q_{d} | 900/1150/1200/1350/1500 | Dual pumps |

4 | 6 | 0.6/0.8/1.0/1.2/1.4 Q_{d} | 1200 | Single pump |

5 | 6,8,10 | 1.0 Q_{d} | 1200 | Single pump |

6 | 6 | 1.0 Q_{d} | 900/1150/1200/1350/1500 | Single pump |

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## Share and Cite

**MDPI and ACS Style**

Wang, K.; Hu, J.; Liu, H.; Zhang, Z.; Zou, L.; Lu, Z.
Research on the Deposition Characteristics of Integrated Prefabricated Pumping Station. *Symmetry* **2020**, *12*, 760.
https://doi.org/10.3390/sym12050760

**AMA Style**

Wang K, Hu J, Liu H, Zhang Z, Zou L, Lu Z.
Research on the Deposition Characteristics of Integrated Prefabricated Pumping Station. *Symmetry*. 2020; 12(5):760.
https://doi.org/10.3390/sym12050760

**Chicago/Turabian Style**

Wang, Kai, Jianbin Hu, Houlin Liu, Zixu Zhang, Li Zou, and Zhaogang Lu.
2020. "Research on the Deposition Characteristics of Integrated Prefabricated Pumping Station" *Symmetry* 12, no. 5: 760.
https://doi.org/10.3390/sym12050760