Energy-Size Reduction of Coals in the Hardgrove Machine

Xie, Weining; He, Yaqun; Luo, Cheng; Zhang, Xia; Hong, Li; Wang, Haifeng; Shi, Fengnian

doi:10.1080/19392699.2014.960079

Cited by 11 publications

(2 citation statements)

References 19 publications

(21 reference statements)

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“…Based on treated experimental data by the Weibull model, fine particles showed higher characteristic stresses to prevent breakage as compared with coarse ones. Xie et al ground coal in narrow size fraction and investigated that the specific rate of breakage rate decreases with the decrease of particle size [6]. The generation rate of fine products also showed the same rate of change with size.…”

Section: Introductionmentioning

confidence: 87%

“…The presence of fine particles slowed down the breakage rate of coarse ones [14]. Xie removed generated fines during grinding and conducted the breakage test with adding the same weight raw coal [6]. Experimental results indicated the increase of specific energy input and acceleration A c c e p t e d M a n u s c r i p t 5 of generation rate of fine particles.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Fine Particles on the Breakage Behavior of Coarse Coal in the Hardgrove Mill

Xie

Wang

et al. 2016

International Journal of Coal Preparation and Utilization

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It is well known that fine particles have a negative influence on the energy-size reduction of other materials in the grinding chamber. But the quantitative evaluation about it is relatively less. In this paper, the Hardgrove mill was used to investigate the effect of fine coal on the grinding energy, specific rate of breakage of the top size and production of fine coal in -0.074 mm. Qualitative description of friction coefficient between coal and grinding media demonstrates that this index drops with more fines added in the particle bed. The decreasing degree of grinding energy increases 2.5 times if added level of fine coal changes from 2.5 g to 10 g. Breakage of the top size at different added levels of fine coal still follows the first-order law. But due to the Downloaded by [University of California Santa Barbara] at 18:15 16 June 2016 A c c e p t e d M a n u s c r i p t 2 decrease of grinding energy and cushion effect of added fine coal, breakage rate of coarse decreases 2% to 25% if compared with the single breakage. Decrease of grinding energy and breakage rate finally results in a lower yield of fines (-0.074 mm). Hence, added fines decrease grinding energy efficiency and make the breakage time-consuming.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Effect of Fine Particles on the Breakage Behavior of Coarse Coal in the Hardgrove Mill

Xie

Wang

et al. 2016

International Journal of Coal Preparation and Utilization

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Investigation of Energy Consumed Characterization of Mixture Grinding in the Ball-and-Race Mill.

Xie

Yang

et al. 2016

XVIII International Coal Preparation Congress

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Comparison of energy efficiency between E and MPS type vertical spindle pulverizer based on the experimental and industrial sampling tests

Xie

Shi

et al. 2017

Energy

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Simulated studies of lab-scale mills, which show the similar breakage mechanism with VSP, and industrial sampling on VSPs are conducted to compare energy efficiencies of E and MPS type VSPs (with the grinding media of balls and tread rollers, respectively). The classical energy-size reduction model is modified with the addition of particle size in the exponential form to compare the grinding energy efficiency (product fineness for the certain specific energy) of two lab-scale mills. Also, differences in structure and operational parameters of lab-scale mills are considered. For the industrial sampling tests of two VSPs, recorded data and size distribution of sampled materials are preliminarily compared. Product t 10 is selected as the bridge to connect the specific grinding energy and size distribution of products. The modified breakage model is combined with ACCEPTED MANUSCRIPT the King's equation to compare the energy efficiency on the premise of feed in the same fineness. Comprehensive comparison of the results obtained from both lab-scale and industrial-scale VSPs suggests that the MPS type VSP shows the higher grinding energy efficiency and lower total energy consumption.

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Energy-Size Reduction of Coals in the Hardgrove Machine

Cited by 11 publications

References 19 publications

Effect of Fine Particles on the Breakage Behavior of Coarse Coal in the Hardgrove Mill

Effect of Fine Particles on the Breakage Behavior of Coarse Coal in the Hardgrove Mill

Investigation of Energy Consumed Characterization of Mixture Grinding in the Ball-and-Race Mill.

Comparison of energy efficiency between E and MPS type vertical spindle pulverizer based on the experimental and industrial sampling tests

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