Optimization of an axial coarse powder separator for low-density lignite based on the optimal seeking method--颗粒学报PARTICUOLOGY

Li, H., Song, Z., Zhang, A., Sun, Z., & Jin, L. (2023). Optimization of an axial coarse powder separator for low-density lignite based on the optimal seeking method. Particuology, 79, 133-142. https://doi.org/10.1016/j.partic.2022.10.013

Optimization of an axial coarse powder separator for low-density lignite based on the optimal seeking method

Haixia Li ^*, Zhiheng Song, Anchao Zhang, Zhijun Sun, Leying Jin

School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

10.1016/j.partic.2022.10.013

Volume 79, August 2023, Pages 133-142

Received 8 July 2022, Revised 16 October 2022, Accepted 21 October 2022, Available online 10 November 2022, Version of Record 24 January 2023.

E-mail: lihx@hpu.edu.cn

Highlights

Abstract

As a major equipment for thermal power plants, the main function of coarse powder separators is to separate particles into size groups according to particle diameter. With the rising coal prices, power plants are using more low-density lignite. Consequently, the original equipment does not operate under normal conditions. Therefore, to return the equipment to normal operating conditions, the isokinetic sampling method, computational fluid dynamics (CFD), and discrete phase model (DPM) based on the Euler–Lagrange method are applied in this research to analyze the effect of baffle shapes, baffle numbers, and centrifugal blades on the equipment performance index, like R90. The shape of the baffle plate was optimized and improved. Preferential method was applied to determine the optimal number of baffles to ensure normal working conditions. Results show that curved baffles can suppress the axial negative gradient field below themselves better than rectangular baffles. The curved baffles selected by the optimal seeking method make full use of the negative axial gradient field and provide the particles entering the separation zone at tangential velocity in advance with the addition of centrifugal blades. Thus, pre-separation can be realized. The R90 is 5 at the separator outlet and 95 at the powder return port, indicating that the output capacity of the separator returned to a reasonable operating performance.

Graphical abstract

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