Kinematics of elastic screen surface and elimination mechanism of plugging during dry deep screening of moist coal

Zhou, Zhiguo; Huang, Long; Hua, Jiang; Wen, Pengfei; Zhao, Liang; Zhao, Yuemin; Chen, Duan; Luo, Zhenfu; Wang, Zhenqian; Liu, Chusheng; Wang, Ziming

doi:10.1016/j.powtec.2019.02.023

Cited by 44 publications

(12 citation statements)

References 20 publications

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“…In order to investigate the influence of geometric parameters and vibration parameters on the screening efficiency of the CVS, this investigation performed a numerical simulation of the screening process under various conditions, such as different length of cantilevered sieve rod, sieve inclination angle, vibration direction angle, vibration amplitude, and vibration frequency. These influence factors are common in studying screening properties of other kinds of vibrating screen in [1][2][3]5,6,[13][14][15][16][17][18][19][20].…”

Section: Establishment Of Screening Simulationmentioning

confidence: 99%

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Screening Mechanism and Properties of a Cantilevered Vibrating Sieve for Particles Processing

et al. 2019

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Screening of fine wet particles or near-aperture particles by traditional screen devices is often not quite effective for sieve plugging. Different from traditional rigid regular mesh sieves, a cantilevered vibrating sieve (CVS) with open screen holes, composed of cantilevered sieve rods, was proposed in this paper. The CVS proved to have a higher screen-penetrating probability relative to traditional sieves. By establishing a bending vibration model for the CVS, it can be found that additional vibrations may emerge during the screen body motion, and a smaller difference between the natural circular frequency and the vibration frequency will achieve a larger vibration of cantilevered sieve rod. On this basis, this investigation also analyzed anti-plugging mechanism of the CVS and systematically discussed the influence laws of the geometric parameters and vibration parameters of the sieve on screening efficiency by the discrete element method.

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Section: Establishment Of Screening Simulationmentioning

confidence: 99%

“…At present, elastic sieves [6] and flip-flow sieves [7] can solve the problem of plugging encountered in the screening of fine wet particles to some extent. Relying on their elastic vibration, elastic sieves may experience a geometric deformation, thus further loosening fine wet particles and cracking the cover film [8,9].…”

Section: Introductionmentioning

confidence: 99%

Screening Mechanism and Properties of a Cantilevered Vibrating Sieve for Particles Processing

et al. 2019

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“… 2 , 13 The screening operation is a critical process of coal beneficiation, which is widely used in mineral classification, coal desliming, tailings dewatering, and product demineralization. 14 − 16 The traditional linear vibrating screens are easily accumulated at the feeding end when the production load increases. This problem makes it difficult for fine particles to penetrate the screen, so the screening effect cannot satisfy the normal needs of the enterprise.…”

Section: Introductionmentioning

confidence: 99%

Research of the Collision Mechanics Model and Time-Frequency Characteristics during the Multistage Variable-Inclination Screening Process for Clean Coal

Huang

Liu

et al. 2022

ACS Omega

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Equal-thickness screening is a critical part of mineral processing; recently, the multistage variable-inclination equal-thickness screen (MSVIETS) has been utilized in the mining industry across the world. In this work, a model of the collision mechanics between particles and the multistage variable-inclination screen surface was established. The maximum collision force ( F max ) was found to be closely related to amplitude, frequency, screen surface inclination, and number of stages. The time-frequency response characteristics of multistage (3-, 4-, and 5-STAGE) screen surfaces were studied by the vibration test analysis system. The permeation screen distribution law of grain groups on the screen surface was revealed. The obtained results show the best screening performance can be obtained from the 5-STAGE scheme with a screening efficiency of higher than 95% and total mismatch content of less than 2%. The synergistic mechanism between two of the parameters was revealed by Box–Behnken response surface methodology (BBRSM). Then, the correlation between the screening evaluation index and the multiple parameters was obtained, and the significant order of the parameters influencing the screening evaluation index was F t > f > n .

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“…Jiang et al [16,17] reported that the equal-thickness vibrating screen has better screening performance than the normal vibrating screen, especially when dealing with a large amount of materials with high moisture. Cleary et al [18,19] investigated the separation performance of a full industrial-scale double-deck banana screen for a peak acceleration of 5 g. Zhou et al [20] reported that, due to the effects of collisions and the resonance, the average vibration intensities of the elastic screen rod and tube were larger than 20. Akbari et al [21] evaluated the dry screening efficiency of the Liwell flipflow screen at 1 mm and 2 mm cut sizes.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of a Vibrating Flip-Flow Screen and Analysis for Screening 3 mm Iron Ore

Wang

Pang

et al. 2020

Shock and Vibration

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Deep dry screening is the key unit in mineral processing. A vibrating flip-flow screen (VFFS) can provide effective solutions for screening fine-grained minerals, and it has been extensively used in many industrial fields. An accurate dynamic model of VFFS considering the influence of materials is significant for its dynamic analysis and screening process research, but it has rarely been studied in detail. In this paper, an improved dynamic model of VFFS is proposed and its dynamic equations are solved to find the reasonable operating condition, and experiments are carried out to verify the reasonability of the proposed model under no-load and loading materials conditions. Furthermore, the method of multistage sampling and multilayer screening is also applied to evaluate the screening performance of iron ore at 3 mm cut size on VFFS. Results show that when the mass of materials, relative amplitude, and operating frequency have values of 107 kg, about 6 mm and 80.79 rad/s, respectively, the screening efficiency gradually increases with an increase of screening length, reaching 89.05%; however, it does not change much when the screening length exceeds 1900.8 mm. Additionally, the misplaced materials of coarse particles will continue to increase as the screening length increases. This provides theoretical and technical support for the optimization of the length of the VFFS.

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Kinematics of elastic screen surface and elimination mechanism of plugging during dry deep screening of moist coal

Cited by 44 publications

References 20 publications

Screening Mechanism and Properties of a Cantilevered Vibrating Sieve for Particles Processing

Screening Mechanism and Properties of a Cantilevered Vibrating Sieve for Particles Processing

Research of the Collision Mechanics Model and Time-Frequency Characteristics during the Multistage Variable-Inclination Screening Process for Clean Coal

Dynamic Characteristics of a Vibrating Flip-Flow Screen and Analysis for Screening 3 mm Iron Ore

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