Answers to CES test online about Bulk Cargo Code …
A cargo of crushed coal, particle size 1 mm and a flow moisture of 20 is to be loaded. The coal had a moisture content of 17 measured 12 days previously, but has lain uncovered on the quayside in heavy rain since.
Quantitative analysis of layered re-crushing of crushed coal particles
Pappas D.M. and Mark C. [20] analyzed the approximate particle size gradient of crushed coal rock mass in the gob, concluded that the stress-strain relationship was nonlinear, and proposed a method for predicting the secant and tangent moduli through a statistical evaluation of the experimental data. Karimpour H. and Lade P.V. [21] studied ...
Effect of temperature on the evolution and distribution for particle …
Variation laws for particle size gradation of the crushed coal particles. The crushed coal particles obtained from the compression experiments under different conditions were manually sieved and weighed. Fig. 5a exhibits the comparison for the particle size gradation (PSG) curve of the the pre- and post-compacted coal samples.
Study on coal pulverization characteristics and gas …
The coal's particle size distribution properties after pulverization and the gas desorption behavior driven by pulverization are of profound meaning to the study of coal and gas outburst mechanism. In this paper, based on the impact crushing experiment, the tectonic coal and primary coal are crushed under different impact energy conditions ...
Micro-structure of crushed coal with different metamorphic …
After the coal body is crushed to a smaller particle size, the effects of oxidation and crushing on the coal free radical concentration are continuously …
Study on the distribution pattern of particle re-crushing in the coal …
The test results show that: the crushing of coal rock particles exists in almost the whole compaction process of the crushed coal rock body, and the crushing of coal rock particles has a non-negligible influence on the deformation of the whole crushed rock body; the structural stability of large-size coal rock particles is not as good as that ...
Effect of Coal Particle Breakage on Gas Desorption Rate …
By selecting a certain particle size as the reference and substituting it into Equation (16), where the initial coal particle size is 7.5 mm in the data of Yang, the ratio of accumulative desorption amount can be calculated by Equation (16) when coal are crushed into different particle sizes.
Calibration method of discrete element parameters of crushed coal …
Changes in particle size is manifested in the specimen composition through an increase in particle size, a reduction in the number of particles, and the coarsening of the bonds between particles. Consequently, the pick comes into contact with a reduced number of coal particles concurrently, resulting in higher force exerted on each particle.
Fractal characteristics of pulverized high volatile bituminous coals
To better understand the effect of particle size on fractal characteristics of pores in coal, three high volatile bituminous coals with mean maximum vitrinite reflectance of 0.82–0.90% collected from the Naryksko-Ostashinskaya coalbed methane field in Kuznetskiy Basin in Russia were crushed and sieved to five progressively decreasing …
Compressive deformation and energy dissipation of crushed coal …
Crushed gangue, an inhomogeneous and discontinuous medium, is accompanied with the absorption and dissipation of energy under compression. In order to study the compressive deformation and energy dissipation of gangue in the loading process under conditions of different particle sizes, loading rates, and first-time stress loads, a …
Seepage properties of crushed coal particles
For crushed coal particles, many experimental, theory and numerical methods have been conducted to understand the properties such as: particle size, ash and density effect on fixed characteristics (Adánez et al., 1993, Liu et al., 2008, Slezak et al., 2010, Jin et al., 2012, Li et al., 2013), coal combustion (Vleeskens, 1984, Gao et al., …
Effect of particle size on re-crushing characteristics of …
By 2019 and 2021, Li and Feng [[31], [32]] first proposed an AE positioning method that is suitable for crushed particle media during compression and selected crushed limestone with particle size of 2.5–5 mm as test samples. The AE parameters …
Experimental study on particle size distribution of impact crushed coal …
Download Citation | Experimental study on particle size distribution of impact crushed coal containing gas | Coal and gas outburst is a coal-rock dynamic disaster caused by the combined action of ...
Effect of Particle Size on the Energy Evolution of Crushed …
DOI: 10.1007/s00603-016-1151-5 Corpus ID: 132191463; Effect of Particle Size on the Energy Evolution of Crushed Waste Rock in Coal Mines @article{Li2017EffectOP, title={Effect of Particle Size on the Energy Evolution of Crushed Waste Rock in Coal Mines}, author={Meng Li and Jixiong Zhang and Nan Zhou and Yanli Huang}, …
Effect of axial stress-induced coal particle breakage on the …
The coal particle sample will be crushed under the axial stress, and different breakage degree will induce various particle size gradations on coal particles. Fig. 3 showed pictures of coal particles of different sizes after coal crushing and screening at 12 MPa. Meanwhile, particle size has an essential effect on the CSC process.
Deep recovery of clean coal from coking middlings: Pre …
The density distribution of the middling coal with different particle sizes after crushing is shown in the Supporting Information Table S1. The proportion of middle-density coal (1.5–1.8 g/cm 3) decreased with decreasing crushed particle size. Conversely, the proportions of low- and high-density middling coal increased with decreasing ...
Investigation on tectonically deformed coal particle …
The study revealed that varying particle size distributions of coal exhibit dissimilar degrees of strain subjected to identical stress conditions. Moreover, the Young's modulus, ... Crushed coal particles reduce the porosity by filling the pores between large particles, and after being compacted, crushed particles form a crushing and ...
Particle size distribution of coal and gangue after impact …
The particle size distributions of coal and gangue under different impact velocities were researched according to the Rosin-Rammler distribution. The …
Drop-weight impact fragmentation of gas-containing coal particles
The mass percentage of crushed coal in any particle size range can be calculated using the distribution function and the density distribution function. The particle size distributions of crushed coal at room temperature and ∼100 kPa are shown in Fig. 4.
Characterization of 10 nm – 10 μm coal dust particles
When the shearer cuts the coal, the coal body contacting the cutter teeth is first crushed into fine chips and then flaked off from the coal wall under the joint action of shear force, squeezing force and impact force, and this process is called crushing. ... The number of coal particles in size ranges of 10 – 40 nm and 70 – 300 nm ...
Influence of moisture and particle size on coal blend bulk density
The bulk density initially decreases, since coal density is 1.4 g/cm 3 and the water density is 1g/cm 3.Thereby, the substitution of coal by water justifies the result found. This can also be explained by the fact that the water enables hydrophobic coal particles to repulse each other, increasing the free space and, consequently, decreasing the density.
Standard method of sieve analysis of coal
A sieve method of analysis for determining the particle size of crushed bituminous coal is described. The method is applicable to coal less than 1/sup 1///sub 2/ in. (38.1 mm) in size. Square-hole sieves of the following sizes are used: 3.35 mm, 4.75 mm, 6.7 mm, 9.5 mm, 13.2 mm. 19.0 mm, and 26.5 mm. Detailed instructions are given for the ...
Effect of particle size on re-crushing characteristics of …
A larger particle deforms more easily and results in more AE counts and energy under the same compression; 2) crushed coal exhibits layered re-crushing …
Research on Particle Size and Energy Consumption Law of Hard Coal
To study the particle size distribution and energy variation law of hard coal under a load, an impact compression test of hard coal specimens under different impact loading conditions was carried out using a Φ50 mm diameter Separate Hopkinson Press Bar (SHPB) test system. We implemented the theory of dynamic impact energy of rock …
Particle Size Distribution and Energy Dissipation in Drop …
In the crushed coal samples of various particle size intervals, the mass of coal samples in the 0–0.25 mm particle size interval accounted for a lower percentage, …
Fractal Fract | Free Full-Text | Experimental …
The permeability of crushed coal bodies plays a bottom neck role in seepage processes, which significantly limits the coal resource utilisation. To study the permeability of crushed coal bodies under …
Classification of crushed coal by particle size: a …
Download scientific diagram | Classification of crushed coal by particle size: a 5–10 mm; b 10–15 mm; c 15–20 mm from publication: Experimental study on the mechanical characteristics of ...
Compaction-deformation behaviors and breakage
On this basis, the crushed coal particles with five various size ranges of 9–10 mm, 8–9 mm, 7–8 mm, 6–7 mm, and 5–6 mm were separated out and evenly mixed for compression tests. It should be noted that the mass fraction of each particle size occupied 20% of the coal sample and the total mass of a tested coal sample was 1120 g.
Effect of temperature on the evolution and distribution for particle …
The variation law for particle size gradation of the crushed coal particles under different conditions, (a) The variation law for particle size gradation under different temperatures (3 MPa); (b) The variation law for particle size gradation under different stresses (30 °C).
Study on the Particle Strength and Crushing Patterns of Coal …
Furthermore, as the particle size decreases, the shapes of crushed coal gangue particles are block, flaky, acicular, and powder, and the particles with a size greater than 5 mm are mainly flaky. In addition, comparative analysis shows that the new gradation equation can better describe the gradation of coal gangue fragments after …