Optimal Design for Anti-erosion of Pneumatic Conveying Elbow with Rib Structure

doi:10.11902/1005.4537.2022.231

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 525-534 DOI: 10.11902/1005.4537.2022.231

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Optimal Design for Anti-erosion of Pneumatic Conveying Elbow with Rib Structure

GUO Zihan, ZHANG Jun, LI Hui(

)

Fujian Province Key Laboratory of Energy Cleaning Utilization and Development, School of Marine Equipment and Mechanical Engineering, Jimei University, Xiamen 361021, China

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Abstract

Elbow erosion is an important matter related directly to the safe operation of pipeline conveying system and the service life of pipeline. To relieve the harmful effect of this kind of erosion, ribs with different shapes such as quadrilateral, isosceles trapezoid and isosceles triangle sections were designed and prepared, which then were installed at different designed positions in the inner edge on the half side of the elbow with large curvature radius, and the effect of evenly installing multiple ribs on the erosion process was also considered. CFD-DPM method was used to simulate the erosion resistance of the elbow with rib structure. The results show that if the rib is installed just behind the leading edge of the particle impact on the elbow wall, the existence of rib can change the trajectory of the particles, inhibit the erosion to a certain extent, and induce the formation a low-speed counter current circulation zone on behind the rib to protect the elbow wall in this area. Among the three proposed ribs of different cross sections, the isosceles triangular ribs have the best anti-erosion effect. The greater the rib thickness is, the greater the protection range is. However, the rib thickness does affect the impact angle of particles and increase the collision frequency of particles, therefore, a proper rib thickness may be carefully selected for acquiring the better anti-erosion performance. The isosceles triangular ribs with a rib thick in 6 mm have the best anti-erosion effect at θ=25°, which is 43.63% higher than that of ordinary curved tubes. Many ribs evenly installed on the elbow also have obvious anti-erosion effect, in fact, installation of 8 ribs with isosceles triangular cross section have the best anti-erosion performance. The conclusion can provide a new reference for the anti-erosion optimization design of elbow.

Key words: pneumatic conveying elbow rib section shape erosion numerical simulation

Received: 15 July 2022 32134.14.1005.4537.2022.231

ZTFLH:

TH232

Fund: Natural Science Foundation of Fujian Province(2022J01334);Natural Science Foundation of Fujian Province(2020J01694)

Corresponding Authors: LI Hui, E-mail: lihui@jmu.edu.cn

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Cite this article:

GUO Zihan, ZHANG Jun, LI Hui. Optimal Design for Anti-erosion of Pneumatic Conveying Elbow with Rib Structure. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 525-534.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.231 OR https://www.jcscp.org/EN/Y2023/V43/I3/525

Fig.1 Schematic diagram of particle stress

Fig.2 Elbow geometry with rib of three different cross sections (a) and multiple rib (b)

Fig.3 Grid division

Fig.4 Grid independence verification

Fig.5 Comparison between experimental and simulated values

Fig.6 Erosion distribution and particle trajectory of ordinary elbow

Fig.7 Maximum erosion rate of rib at different elbow angles with different shapes of quadrilateral rib (a), isosceles trapezoidal rib (b) and isosceles triangular rib (c)

Fig.8 Erosion rate distribution of rib with different shapes at different angles θ

Fig.9 Particle trajectory and velocity vectors of ribs with different shapes at different angles θ

Fig.10 Collision diagram of particles under different cross section shapes

Fig.11 Variation of the maximum erosion rate of isosceles trapezoidal ribs with depth at different positions of θ=10° (a), θ=15° (b), θ=20° (c), θ=25° (d) and θ=30° (e)

Fig.12 Variation of the maximum erosion rate of isosceles triangular ribs with depth at different positions of θ=10° (a), θ=15° (b), θ=20° (c), θ=25° (d) and θ=30° (e)

Fig.13 Velocity vectors of ribs at different depths

Fig.14 Maximum erosion rate under different number of ribs

Fig.15 Velocity vector diagram of ribs in different quan-tities

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