Analysis of Energy Consumption of Crushing Processes – Comparison of One-Stage and Two-Stage Processes

Ciężkowski, P.; Maciejewski, Jan; Bąk, Sebastian

doi:10.1515/sgem-2017-0012

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Based on the Poincar hypothesis [15], according to the generalized physical model of the shape of the material, one can take the sphere. The main provisions and the final proof of the Poincar conjecture are presented in [16].…”

Section: Materials and Methods For The Study Of Energy Costsmentioning

confidence: 99%

Determiantion of energy characteristics of material destruction in the crushing chamber of the vibration crusher

Nazarenko

Mishchuk²,

Mishchuk³

et al. 2021

EEJET

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The crushing equipment is characterized by a significant energy-consuming system during the crushing workflow. The current trend in the development of such processes puts forward requirements for the development of new or improvement of existing energy-saving equipment. The essence of the solution to the problem in this work is determined by using resonant modes, which are inherently the most effective. The practical implementation of the resonance mode has been achieved taking into account the conditions for the interaction of the resonant vibration crusher with the material at the stages of its destruction. The degree of the stress-strain state of the material is taken into account, which was a prerequisite for identifying the potential for the development of a vibration load. Composed equations of motion based on a substantiated discrete-continuous model of a vibration crusher and processing material. An approach is applied to determine the stepwise destruction of the material with the determination of the required degree of energy. This methodological approach made it possible to reveal the nature of the process of material destruction, where energy costs at the stages of crack formation, their development and final destruction are taken into account. It was revealed that the greatest energy consumption during the operation of crushers goes into the kinetic energy of the crushing plates and the potential energy of deformation of the springs. The proposed model is common for any design of a vibration machine and its operating modes. The stable resonance mode has made it possible to significantly reduce the energy consumption for the course of the technological process of material grinding. The results obtained are used to improve the calculation methods for vibratory jaw and cone crushers that implement the corresponding energy-saving stable zones of the working process.

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Section: Materials and Methods For The Study Of Energy Costsmentioning

confidence: 99%

Determiantion of energy characteristics of material destruction in the crushing chamber of the vibration crusher

Nazarenko

Mishchuk²,

Mishchuk³

et al. 2021

EEJET

View full text Add to dashboard Cite

show abstract

“…From the particle size and microscopic morphology, it can be seen that most of the broken coal-like particles are close to spherical or ellipsoidal, with only a few irregular shapes. According to the new surface theory [43,44], the coal crushing energy was all used to create new surfaces, the area of which was generated by the crushed coal:…”

Section: Energy Transfer Characteristics During Thementioning

confidence: 99%

Critical Conditions and Energy Transfer Characteristics of the Failure Process of Coal-Rock Combination Systems in Deep Mines

et al. 2021

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With the steady increase in the size, intensification, and modernization of coal production enterprises, the deep coal resources in large coal bases are gradually entering the mining stage. When the coal mining reaches the deep zone, the interactions between various underground dynamic hazards begin to occur. These interactions are affected by the engineering geological environment and can lead to the occurrence of severe compound hazards. When coal and gas outbursts occur and destabilize the mining area, the high geostress causes the multiphysical coupling effect of the laminated overburden system to become more pronounced. Therefore, we analyzed the development path of a coal-rock system under instability conditions from the perspective of coal–rock coupling, constructed a model of the coal-rock combination system’s structure, and proposed three directions (i.e., strain softening, limit equilibrium, and dynamic instability) for the development of coal-rock system instability. Then, we established a model for the critical conditions of the system’s failure process and elucidated that the release of the rock’s elastic energy promoted the instability of the coal. Furthermore, we verified the established critical conditions through laboratory tests on a coal-rock combination structure and obtained the patterns of the rock energy transferring into the coal seam during the instability failure process of the coal–rock combination structure. When the coal–rock combination structure failed, the rock strain reached its maximum value and the strain rebound phenomenon occurred. The stored elastic strain energy released by the rock into the combination system accounted for 26% to 53% of the accumulated energy in the rock itself, and the released elastic energy and the new surface area of the crushed coal sample followed a logarithmic relationship. The findings of this study provide theoretical support for the identification and quantitative analysis of instability due to the dynamic hazards of coal-rock gas in deep mines.

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Energy efficiency in mechanical pulping – definitions and considerations

Sandberg

Ferritsius

2021

Nordic Pulp &Amp; Paper Research Journal

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Production of mechanical pulps requires high specific electrical energy compared to many other attrition processes. In Scandinavia, the lowest specific refining energy for production of thermomechanical pulp is around 1800 kWh/t for newsprint quality, which is roughly 60 times higher than for crushing of stone to a similar size distribution. The high specific energy demand for refining has naturally motivated large efforts in the search for improved efficiency. It is always practical to be able to quantify improvements in efficiency for comparison of process designs and of different machine types. However, there is no commonly accepted definition of efficiency for mechanical pulping processes. In published work within mechanical pulping, energy efficiency has been presented in different ways. In this paper, we discuss definitions of energy efficiency and aspects that ought to be considered when energy efficiency is presented. Although focus of this work is on energy efficiency for refiner processes, the principles can be applied to other types of mechanical pulping processes such as stone groundwood.

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Analysis of Energy Consumption of Crushing Processes – Comparison of One-Stage and Two-Stage Processes

Cited by 4 publications

References 6 publications

Determiantion of energy characteristics of material destruction in the crushing chamber of the vibration crusher

Determiantion of energy characteristics of material destruction in the crushing chamber of the vibration crusher

Critical Conditions and Energy Transfer Characteristics of the Failure Process of Coal-Rock Combination Systems in Deep Mines

Energy efficiency in mechanical pulping – definitions and considerations

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