Numerical simulation of water-slag elbow erosion-inhibiting by regulating the slag injection position with a novel preceding rotating sheet structure--颗粒学报PARTICUOLOGY

Wen, F., Xu, L., Chen, Y., Deng, Z., Zhang, S., Song, W., . . . Wei, L. (2024). Numerical simulation of water-slag elbow erosion-inhibiting by regulating the slag injection position with a novel preceding rotating sheet structure. Particuology, 90, 323-339. https://doi.org/10.1016/j.partic.2024.01.001

Numerical simulation of water-slag elbow erosion-inhibiting by regulating the slag injection position with a novel preceding rotating sheet structure

Fopeng Wen^a, Liuyun Xu ^b, Yixiang Chen ^a, Zhaofu Deng^a, Shen Zhang^a, Wenming Song^c, Yuge Li ^c, Liping Wei ^{a d *}

a School of Chemical Engineering, Northwest University, Xi’an, 710069, China
b School of Chemistry and Chemical Engineering, Yan'an University, Yan'an, 716000, China
c Machinery Industry Shanghai Lanya Petrochemical Equipment Inspection Institute Co., Ltd., Shanghai, 201518, China
d The Research Center of Chemical Engineering Applying Technology for Resource of Shaanxi, Xi’an, 710069, China

10.1016/j.partic.2024.01.001

Volume 90, July 2024, Pages 323-339

Received 8 October 2023, Revised 17 December 2023, Accepted 1 January 2024, Available online 11 January 2024, Version of Record 7 February 2024.

E-mail: weiliping@nwu.edu.cn

Highlights

• Erosion mechanism of non-uniform particles was quantitatively investigated.

• A new indicator of uneven factor was proposed.

• A preceding rotating sheet structure (PRSS) was innovatively designed.

• PRSS structure shows excellent corrosion resistance based on the simulation.

Abstract

The elbow erosion seriously jeopardizes the safe and stable operation of water–slag discharge pipeline of the coal gasification system. This work simulated water–slag elbow characteristics with various slag injection positions by simulating five simplified and representative erosion categories, including A-type horizontal-vertical elbow with an upstream flow, B-type horizontal-vertical elbow with a downstream flow, C-type vertical-horizontal elbow with an upstream flow, D-type vertical-horizontal elbow with a downstream flow and E-type horizontal-horizontal elbow. Compared with the C/D-type elbow, where particles were injected uniformly, the A-type elbow and E-type elbow were found to increase erosion rate, while the B-type elbow decreases erosion rate. An interesting discovery is that the elbow erosion rate is relatively low for small particles when particles are injected from the middle and bottom positions of the inlet section of the elbow. Based on the observation, a novel preceding rotating sheet structure was developed to regulate the particle injection position. It shows an excellent anti-erosion performance by reducing the maximum erosion rate of particles with diameters of 50, 100, and 200 μm by 23%, 35%, and 43%, respectively.

Graphical abstract

Keywords

Erosion; Slag-water; Uneven particles; Elbow pipe; Erosion inhibition; Preceding rotating sheet structure

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