Ultrasonic technique for online measurement of bulk density of stamp charge coal cakes in coke plants

Indimath, Shivanandan; Saravanakumar, R.; Balamurugan, S.; Das, B. B.; Singh, Ranjan K.; Dutta, Moumita

doi:10.1016/j.fuproc.2017.12.017

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…The contact model is very important for the simulation results of the DEM. Because there is no adhesion force in the silicon ore, Hertz Mindlin (no slip) built-in in the soft ball model is used as the model between the silicon ore and the silicon ore and the external …”

Section: Methodsmentioning

confidence: 99%

“…Because there is no adhesion force in the silicon ore, Hertz Mindlin (no slip) built-in in the soft ball model is used as the model between the silicon ore and the silicon ore and the external. 23 The elastic coefficient in the Hertz Mindlin (no slip) built-in model belongs to the physical characteristic parameter of the particle itself, 24 which is generally calculated using the following formula…”

Section: Methodsmentioning

confidence: 99%

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Research on the Wear Behavior of the Fixed Cone Liner of a Cone Crusher Based on the Discrete Element Method

Wang²,

Wang

et al. 2020

ACS Omega

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Taking reducing the wear of the fixed cone liner of a cone crusher as the starting point, the movement and geometry parameters of the cone crusher are studied using the discrete element method. To improve the service life and working efficiency of the whole cone crusher. The UG model and discrete element Yade model of the cone crusher are established, and the different shapes of the tin ore are represented using Yade’s preprocessor through eight different ways of particle combination and superposition. The static friction coefficient between the manganese ore and the cone crusher is studied and calibrated using the slope method. The relative error between the Yade and test results is 1.58%, and the calibration result is 0.44. The repose angle of the manganese ore is studied using the collapse method. The repose angle increases with the increase of the static friction coefficient and the dynamic friction coefficient, but the change trend is different. The effect of the dynamic friction coefficient on the repose angle is obviously greater than that of the static friction coefficient. The dynamic friction coefficient obtained by Yade is 0.042. Taking the swing distance, rotating speed, and bottom angle of the fixed cone as the orthogonal experimental factors of Yade, the regression equation of the fixed cone liner was obtained through the nonlinear processing of SPSS 25.0. According to Matlab R2017b, the influences of the swinging distance, rotating speed, and bottom angle of the fixed cone on the fixed cone liner are obtained. According to Yade’s research results, the order of the influence degree of liner wear is: the rotating speed of moving cone, the swinging distance of the fixed cone, and the base angle of fixed rotation. When the swinging distance of the fixed cone is 146 mm, the rotating speed of the moving cone is 198 rpm, the fixed rotation bottom angle is 28°, and the minimum value of the liner wear is 23 mm. Yade’s results are consistent with the change trend of the wear amount of the bushing obtained from the test. The research results show the correctness of using the Yade method to study the wear of the fixed cone liner of a cone crusher, which provides a theoretical basis for reducing the wear of the fixed cone liner of a cone crusher, and puts forward a new method to study the wear of relevant parts of a fixed cone crusher. At the same time, the research results are of great significance for achieving energy-saving in mining enterprises.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Research on the Wear Behavior of the Fixed Cone Liner of a Cone Crusher Based on the Discrete Element Method

Wang²,

Wang

et al. 2020

ACS Omega

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“…It is mainly used in the product development fields of mechanical product modeling design, structural design, part assembly design, mold design, numerical control programming, design analysis, etc.) The radius difference between the two concentric circles is 230 mm [26][27][28][29][30], and it is added to the creator in FEPG in the form of x_t (Figure 4). The material of the setting ring in FEPG is 40Cr, the inner part of the cylinder is WDB620 (movable jaw plate material), and the outer part is laser cladding ceramic powder.…”

Section: Methodsmentioning

confidence: 99%

Finite Element Study on the Wear Performance of Movable Jaw Plates of Jaw Crushers after a Symmetrical Laser Cladding Path

Chen

Zhang

et al. 2020

Symmetry

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At present, research on the influence of friction heat on the wear resistance of laser cladding layers is still lacking, and there is even less research on the temperature of laser cladding layers under different loads by a finite element program generator (FEPG). After a symmetrical laser cladding path, the wear performance of the moving jaw will change. The study of the temperature change of the moving jaw material in friction provides a theoretical basis for the surface modification of the moving jaw. The model of the column ring is built in a finite element program generator (FEPG). When the inner part of the column is WDB620 (material inside the cylinder) and the outer part is ceramic powder (moving jaw surface material), the relationship between the temperature and time of the contact surface is analyzed under the load between 100 and 600 N. At the same time, the stable temperature, wear amount, effective hardening layer thickness, strain thickness, and iron oxide content corresponding to different loads in a finite element program generator (FEPG) were analyzed. The results showed that when the load is 300 N, the temperature error between the finite element program generator (FEPG) and the movable jaw material is the largest, and the relative error is 4.3%. When the load increases, the stable temperature of the moving jaw plate increases after the symmetrical laser cladding path, and the wear amount first decreases and then increases. The minimum wear amount appears at a load of 400 N and a temperature of 340 °C; the strain thickness of the sample material increases gradually, and the effective hardening layer thickness increases. However, when the load reaches 400 N, the thickness of the effective hardening layer changes little; the content of Fe decreases gradually, and the content of FeO and Fe2O3 increases. The increase of the moving jaw increases in turn the temperature of the laser cladding layer of the test jaw material, which intensifies the oxidation reaction of the ceramic powder of the laser cladding layer.

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“…Consequently these methods are usually proposed to be applied around the riser section of a well, above the sea floor, where maximum increase in volume of gas is observed. The acoustic properties of multi-phase materials containing voids or gas has been extensively studied 13 and used for estimating the bubble population 14 , void fraction and sound speed 15 , 16 in such media. Hage et al 17 discuss a similar method based on a modified Wood’s equation for evaluating the velocity and phase change of an acoustic wave propagating along the annulus of the borehole.…”

Section: Introductionmentioning

confidence: 99%

Effect of bubble size on ultrasound backscatter from bubble clouds in the context of gas kick detection in boreholes

Indimath

Fiorentini

Bøklepp

et al. 2023

Sci Rep

Self Cite

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Early detection of gas influx in boreholes while drilling is of significant interest to drilling operators. Several studies suggest a good correlation between ultrasound backscatter/attenuation and gas volume fraction (GVF) in drilling muds, and thereby propose methods for quantification of GVF in boreholes. However, the aforementioned studies neglect the influence of bubble size, which can vary significantly over time. This paper proposes a model to combine existing theories for ultrasound backscatter from bubbles depending on their size, viz. Rayleigh scattering for smaller bubbles, and specular reflection for larger bubbles. The proposed model is demonstrated using simulations and experiments, where the ultrasound backscatter is evaluated from bubble clouds of varying bubbles sizes. It is shown that the size and number of bubbles strongly influence ultrasound backscatter intensity, and it is correlated to GVF only when the bubble size distribution is known. The information on bubble size is difficult to obtain in field conditions causing this correlation to break down. Consequently, it is difficult to reliably apply methods based on ultrasound backscatter, and by extension its attenuation, for the quantification of GVF during influx events in a borehole. These methods can however be applied as highly sensitive detectors of gas bubbles for GVF $$\ge$$ ≥ 1 vol$$\%$$ % .

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Ultrasonic technique for online measurement of bulk density of stamp charge coal cakes in coke plants

Cited by 9 publications

References 16 publications

Research on the Wear Behavior of the Fixed Cone Liner of a Cone Crusher Based on the Discrete Element Method

Research on the Wear Behavior of the Fixed Cone Liner of a Cone Crusher Based on the Discrete Element Method

Finite Element Study on the Wear Performance of Movable Jaw Plates of Jaw Crushers after a Symmetrical Laser Cladding Path

Effect of bubble size on ultrasound backscatter from bubble clouds in the context of gas kick detection in boreholes

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