Effect of the particle shape and swirling intensity on the breakage of lump coal particle in pneumatic conveying

Zhou, Jiawei; Liu, Yu; Du, Chenglie; Liu, Songyong

doi:10.1016/j.powtec.2017.05.034

Cited by 57 publications

(24 citation statements)

References 41 publications

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“…A displacement meter (7) is fixed at one side of the base. A force sensor (9) is installed between the baseplate (8) and the base (10). e impact energy is changed by the adjustment drop height or the mass of the drop weight.…”

Section: Apparatus Conventional Dwt Tests Take Gravitational Potentimentioning

confidence: 99%

“…During ore processing, the particles are irregular with greatly varying shapes and initial sizes, so the difference between the experimental values and virtual values of breakage energy can be reduced to carry out individual impact tests using irregular particles, which helps improve the accuracy of the design of technology parameters. e particle shape affects the loading modes and breakage process, resulting in the change of breakage characteristics and energy characteristics [9,10]. e impact breakage characteristics of nonspherical coal were studied by Zheng et al [11] using discrete element method (DEM) simulation with the parallel-bond model of primary particles.…”

Section: Introductionmentioning

confidence: 99%

“…e samples were washed and air-dried; the mass of the dry samples was 55-1082 g (Figure 1). [10,11,13,14]. e formula of sphericity is given by…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

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Particle shape and size are main factors influencing particle breakage. Single-particle breakage tests were conducted on irregular magnetite ore using modified drop weight impact equipment to analyze the effect of shape and size on specific breakage energy. A method to measure the effective breakage energy is presented. Ore particles with different sphericities and different sizes were broken into several fragments with differing impact energies in the tests. Experimental studies indicate that the shape of particles significantly influences the impact loading mode and breakage progress; the specific breakage energy has an obvious relationship with the sphericity and the initial size. The specific breakage energy decreases with larger initial loading area. The particle needs less specific breakage energy if the shape or placement state is more conducive to tensile fracture. There is an increase in specific breakage energy corresponding to an increase in particle sphericity with fixed initial size range. With the increase in the initial size of the particle, the specific breakage energy decreases with fixed sphericity range, which presents a power function with the exponent −0.5. The comprehensive relationship between specific breakage energy, particle sphericity, and initial size was established, showing that the input power of the crushing machinery and the optimization of crushing technology should be performed with consideration of the influence of particle shape and initial size to reduce specific energy consumption and improve energy efficiency.

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Section: Apparatus Conventional Dwt Tests Take Gravitational Potentimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

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“…The Hertz-Mindlin with bonding was selected as the contact model between coal particles in this paper. The bonding model was depicted in Figure 2 [29][30][31]. is the normal overlap between particles, , are normal and tangential damping, and , are normal contact stiffness and tangential contact stiffness between particles.…”

Section: Mechanical Parameters Of Coal Particlesmentioning

confidence: 99%

Discrete Element Simulation of Conical Pick’s Coal Cutting Process under Different Cutting Parameters

Liu

Zeng

et al. 2018

Shock and Vibration

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To explore how the cutting parameters affect the conical pick’s cutting force in coal cutting process, some simulation tests were carried with EDEM based on analysis of coal cutting process of conical pick and micro mechanical characteristic of coal particles. In this paper, traction speed, drum angular velocity, and installation angle of conical pick were considered as the main coal cutting parameters. The discrete element simulations were conducted under 7 sets of various cutting parameters, which were determined in the range of empirical parameters. From the results of the simulation tests, it can be concluded that the fragmentation of coal particles appears in a compacted, squeezed, and crumbling state in coal cutting process; the traction speed has the greatest impact on the conical pick’s cutting force and cutting force fluctuation and the influence of drum angular velocity and installation angle reduce in turn; the force and force fluctuation tend to decrease and obviously increase, respectively, with the increase of drum angular velocity and traction speed; and they will reach the minimum when the pick’s installation angle is 45° under certain traction speed and drum angular velocity.

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“…Research on coal particle size degradation and the generation of fine particles has been reported in the literature. Under the same energy conditions, the coal lithotype (Shi et al 2018), particle sphericity (Zhou et al 2017), initial particle size (Oberholzer and van der Walt 2009), and proportion of fine particles (Xie et al 2017) all affect the breakage rate of coal particles. That is, the amount of energy required for breakage is predominantly dependent on the size, shape, and breakage properties of the specimen as well as the input energy (Sahoo 2005(Sahoo , 2006Sahoo and Roach 2005).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on evolution law for particle breakage during coal and gas outburst

Peng

Qiao

et al. 2019

Int J Coal Sci Technol

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Coal and gas outburst is a dynamic phenomenon in underground mining engineering that is often accompanied by the throwing and breakage of large amounts of coal. To study the crushing effect and its evolution during outbursts, coal samples with different initial particle sizes were evaluated using a coal and gas outburst testing device. Three basic particle sizes, 5-10 mesh, 10-40 mesh, and 40-80 mesh, as well as some mixed particle size coal samples were used in tests. The coal particles were pre-compacted at a pressure of 4 MPa before the tests. The vertical ground stress (4 MPa) and the horizontal ground stress (2.4 MPa) were initially simulated by the hydraulic system and maintained throughout. During the tests, the samples were first placed in a vacuum for 3 h, and the coal was filled with gas (CH 4) for an adsorption time of approximately 5 h. Finally, the gas valve was shut off and the coal and gas outburst was induced by quickly opening the outburst hole. The coal particles that were thrown out by the outburst test device were collected and screened based on the particle size. The results show the following. (1) Smaller particle sizes have a worse crushing effect than larger sizes. Furthermore, the well-graded coal particles are weakly broken during the outburst process. (2) As the number of repeated tests increases, the relative breakage index grows; however, the increment of growth decreases after each test, showing that further fragmentation becomes increasingly difficult.

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Effect of the particle shape and swirling intensity on the breakage of lump coal particle in pneumatic conveying

Cited by 57 publications

References 41 publications

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Discrete Element Simulation of Conical Pick’s Coal Cutting Process under Different Cutting Parameters

Experimental study on evolution law for particle breakage during coal and gas outburst

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