Discrete modeling of a longwall coal mine gob for CFD simulation

Juganda, Aditya; Strebinger, Claire; Brune, Jürgen F.; Bogin, Gregory E.

doi:10.1016/j.ijmst.2020.05.004

Cited by 34 publications

(9 citation statements)

References 11 publications

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“…The latest tools and technologies are used for this aim, such as RFID technology, laser scanning, single-wire energy transfer, wire strain gauges, ultrasonic systems and preliminary estimation [19][20][21]. In addition to bench, experimental [22] and real-conditions testing [23,24], simulation studies and numerical analyses [25][26][27][28] play an increasingly important role. Statistical analyses, data analyses [29] and decision-making procedures are used.…”

Section: Introductionmentioning

confidence: 99%

Research and Simulation on the Development of a Hydraulic Prop Support System of Powered Roof Support to Increase Work Safety

Borska,

Szurgacz

2024

MPs

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The underground mining environment is currently based on technology that uses mainly analogue sensors in machine and equipment control systems. The primary machine performing the most important functions in a mining system is the powered roof support. In order for it to work properly, it is important that it achieves the required power. To ensure this, it is necessary to continuously and precisely monitor the pressure in the under-piston space of the prop. Due to the extreme environmental conditions, pressure sensors should have high sensitivity, large transmission capacity, small size and light weight. To achieve these requirements, the authors of the article propose to implement a monitoring system based on photonics technology. To achieve this goal, several studies were carried out. The range of these studies included simulations, bench tests and tests under real conditions. The obtained test results showed the possibility of developing the control system for the powered roof support, the additional function to supercharge power. Based on the analysis of the obtained test results, assumptions were developed for the development of a power charging system with monitoring sensors. Based on the guidelines obtained from the research results, thedevelopment of the above prototype based on photonics technology is proposed.

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Section: Introductionmentioning

confidence: 99%

Research and Simulation on the Development of a Hydraulic Prop Support System of Powered Roof Support to Increase Work Safety

Borska,

Szurgacz

2024

MPs

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“…Lijun and others − proposed a formula for calculating the discharge of gun smoke in underground engineering, discussed the shortcomings of the existing ventilation airflow calculation method for tunnel blasting and digging, and verified it with the field measurement data; Cui and others − studied the transportation and distribution law of blasting smoke in tunnels and mines under natural ventilation. In coal mine ventilation, Juganda and others , provided a theoretical basis of CFD and, using numerical simulation, analyzed and summarized that fluid dynamics can be used in simulation to solve the hazards of coal mine gas explosion, fire, dust explosion, high heat, and humidity, as well as to identify poor-ventilation areas in which methane air tends to accumulate, areas where methane air tends to accumulate, and to design a reasonable ventilation method to solve the hazards to the greatest extent.…”

Section: Introductionmentioning

confidence: 99%

CO Diffusion Study and Spatial and Temporal Variation Modeling during the Construction Period of the Plateau Railroad Tunnel

Liu,

Zhao,

Wang

et al. 2023

ACS Omega

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In order to investigate the diffusion law of CO gas in the vicinity of the tunnel boring face of the plateau long tunnel, to improve the efficiency of tunnel smoke exhaust, and to derive the spatial-temporal variation model of CO concentration for predicting the concentration of CO at different times and in different cross sections under specific environments, a CO diffusion model of a tunnel in Yunnan was established by using Ansys Fluent Fluid Simulation Software, and the CO transport characteristics under different conditions were simulated by taking the ventilation time, wind speed, and location of the air ducts as the influencing factors. The results show that the wind flows from the mouth of the wind pipe after the wind speed decreases, the diffusion area increases and arrives at the face of the direction of the rebound in the jet stream of new wind, and the return wind under the joint action of the vortex produced obviously, to reach the wind pipe mouth after the tunnel wind flow field, basically tends to stabilize. When the wind pipe mouth was arranged in the arch waist, 20 m away from the boring face, the inlet wind speed was 9 m/s and the ventilation time was 30 min; the CO concentration in the tunnel was reduced to below the maximum allowable concentration value. Moreover, the concentration of CO in the tunnel at the moment of 15 min of ventilation has a nonlinear positive correlation with the change of distance L from the boring face, while at the cross section of the air outlet of the wind pipe L = 20 m, the ventilation time is from 1 to 30 min and the concentration of CO at the cross section has a nonlinear decreasing trend with the ventilation time, which can be deduced according to the different space–time change models.

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“…For this purpose, bench 2 of 14 testing [35][36][37] and in situ testing [38][39][40][41] are carried out. They are complemented by model testing [42,43] and computer simulations [44][45][46] based on mathematical algorithms [47][48][49][50][51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

Minimizing Internal Leaks of a Powered Roof Support’s Hydraulic Prop Based on Double Block with Charging

Szurgacz

Borska²,

Diederichs³

et al. 2023

Energies

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The hydraulic system of a powered roof support performs two functions. The first function is to control the powered roof support in the extraction wall. The second function is to protect against adverse overloads resulting from rock mass pressing directly on the powered roof support. This damaging phenomenon is prevented by the protection of the powered roof support, with a safety valve built into the hydraulic system or directly into the prop. However, the third function proposed by the authors based on the research results is to minimize leaks. These leaks usually develop in the props or in the hydraulic system. The authors propose implementing changes to the hydraulic system for this purpose. The change consists of replacing the existing support block with a double block with charging. Tests were carried out in real conditions, that is, a mining wall. Tests in the mining wall were carried out on the powered roof support’s leaking prop. As a result of charging, the actual load capacity of the prop increased by about 10–50% in relation to the load capacity before charging. The use of a double block with charging ensured that the pressure in the under-piston space of the prop was maintained at a minimum of 250 bar. The results allowed us to determine the usefulness of the proposed solution and eliminate its disadvantages—the designated direction of research and development on the powered roof support allowed us to expand its functionality by minimizing leaks.

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Discrete modeling of a longwall coal mine gob for CFD simulation

Cited by 34 publications

References 11 publications

Research and Simulation on the Development of a Hydraulic Prop Support System of Powered Roof Support to Increase Work Safety

Research and Simulation on the Development of a Hydraulic Prop Support System of Powered Roof Support to Increase Work Safety

CO Diffusion Study and Spatial and Temporal Variation Modeling during the Construction Period of the Plateau Railroad Tunnel

Minimizing Internal Leaks of a Powered Roof Support’s Hydraulic Prop Based on Double Block with Charging

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