Minerals | Free Full-Text | Review of Respirable Coal Mine …
Respirable coal mine dust (RCMD) exposure is associated with black lung and silicosis diseases in underground miners. Although only RCMD mass and silica concentrations are regulated, it is possible that particle size, surface area, and other chemical constituents also contribute to its adverse health effects. This review …
Stochastic distribution characteristics of void fraction in …
Multi-scale voids including fractures and bed separations will appear and dynamically develop as the underground mining-induced disturbance increases. The void fraction, which is an index for characterizing the void scale, is an important parameter for understanding the heat and mass transfer (including methane flow, coal spontaneous …
CFD Modeling of Methane Gas Distribution and Control …
Balusu R, Deguchi G, Holland R, Moreby R, Xue S, Wendtl M, Mallet C, Goaf gas flow mechanics and development of gas and sponcom control strategies at a highly gassy coal mine, Australia-Japan Technology Exchange Workshop, 2001, 3–4 December, Hunter Valley, Australia, 18 pp.
Numerical Study of Damage Evolution Law of Coal Mine …
With the increase of mining scale and development depth, coal mine accidents (such as rockburst, coal– gas outburst, roof collapse, etc.) show an upward trend, especially in China. According to statistics (Wang and Meng 2018), from 2004 to 2016, a total of 20,980 coal mine accidents occurred in China, and most of them were caused by the ...
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DERON Mining Equipment Distributor. ... Supplying auxiliary hydraulic pressure and flow wherever it's needed. Details: 58 HP Diesel Engine w/ Lofa Panel 15 …
(PDF) Frequency distribution of the pH of coal-mine …
Frequency Distribution of the pH of Coal-Mine Drainage in Pennsylvania By Charles A. Cravotta III, Keith B.C. Brady, Arthur W. Rose, and Joseph B. Douds ABSTRACT The pH of coal-mine drainage in Pennsylvania has a bimodal frequency distribution, with modes at pH 2.5 to 4 (acidic) and pH 6 to 7 (near neutral).
Flow field and gas concentration distribution in the coal mining …
Under different ventilation system, the flow field and gas concentration distribution characteristics of coal mining face are different. Taking U-Shaped and J-Shape ventilation as an example, the physical model of gas flow in coal mining face and mined-out area was established by COMSOL Multiphysics multi-physics coupled …
Influences of ventilation parameters on flow field and dust …
Influences of ventilation parameters on flow field and dust migration in an underground coal mine heading Sci Rep . 2020 May 22;10(1):8563. doi: 10.1038/s41598-020-65373-7.
Coal Mining
Fenner Dunlop straight warp, belts, like MineFlex, are used extensively in underground mines for the extraction of both thermal coal and coking coal. MineFlex is also great for …
Coal explained Mining and transportation of coal
Mining coal. Coal miners use large machines to remove coal from the earth. Many U.S. coal deposits, called coal beds or seams, are near the earth's surface, but others are deep underground.Modern mining methods allow U.S. coal miners to easily reach most of the nation's coal reserves and to produce about three times more coal in one hour than in …
Numerical Simulation of Migration and Distribution Law for …
Most of the coal in China is exploited via underground mining, in which the gas pressure increases with the mining intensity and depth. However, Chinese coal mines encounter various dynamic disasters arising from the following factors: complex geological conditions, harsh working environment, backward technical equipment and chaotic …
Effects of flow distributor structures and particle-wall …
DOI: 10.1016/j.seppur.2023.126140 Corpus ID: 266537170; Effects of flow distributor structures and particle-wall interaction on baghouse gas-solid flow @article{Zhang2023EffectsOF, title={Effects of flow distributor structures and particle-wall interaction on baghouse gas-solid flow}, author={Feng Zhang and Yuhao Ding and Ze …
Modeling temperature distribution upon liquid-nitrogen injection …
Liquid N 2 could be injected into goaf to decrease temperature and prevent spontaneous combustion during mining. A working face at Liangbaosi coal mine was adopted for study.
Numerical simulation study on dust pollution characteristics …
Combining the minimum required air flow rate in the field, it can be confirmed that the optimal dust-removal air flow rate is 1500–1600 m 3 /min for the 1109 working face of Gaozhuang Coal Mine, and in order to better protect the coal mine workers in a clean production environment. The operation can be combined with spray dust reduction and ...
Study on physicochemical properties, distribution modes, …
1. Introduction. In China, coal occupies a pivotal position within the energy and chemical industries. As such, its clean and efficient utilization has far-reaching strategic significance and practical implications for promoting national economic development (Zhou et al., 2022).Large-scale coal gasification, as a frontier technology in the modern energy and …
(PDF) Self-hydrolyzing Submerged Flow Technology for Acid Coal Mine …
It was found in this study that the removal rate of sulfate ions and iron ions from the acidic coal mine drainage stock solution at pH=2.7 was very limited by self-hydrolytic sedimentation ...
Numerical study on dust movement and dust distribution …
This study is based on the data for the practical local condition and the former research (Li and Liu, 2012).The simplified model of the laneway in coal mine is shown in Fig. 1.It consists of a heading face, an outlet, a blast pipe, an exhaust pipe and a cuboida body, with rectangular cross-section, which is the main part of the laneway.
Northwest Mine Supply – Mining and Industrial …
Lubrication & Filtration. Northwest Mine Supply knows ground support. From rock bolts to mesh, we have all modern support and stabilization products for both avove ground and underground applications. Two of …
Modeling temperature distribution upon liquid-nitrogen …
3. Heat transfer modeling. In a mine goaf, the coal absorbs oxygen and releases heat (Banerjee, 1985).Meanwhile, the air leakage takes away some heat. The temperature development in a goaf is a very complicated problem, influenced by air flow, chemical reactions, and heat transfer (Arisoy and Akgün, 1994; Beamish et al., 2000; …
Analysis of distribution method of designed air quantity in coal mine …
Safety Regulations of Coal Mine (China) 1 and other regulations and criteria 2,3,4,5,6,7 all stipulate the calculation method of the designed mine total air quantity and its distribution method ...
Experimental and numerical simulation study on forced …
The distribution of the wind flow field in the roadway with and without the influence of dust is shown in Fig. ... (2020) Numerical simulation study on dust pollution characteristics and optimal dust control air flow rates during coal mine production. J Clean Prod 248:119197.
Preferential flow characteristics of reclaimed mine soils in a …
During the mining process at the surface coal mine, the land was excavated and occupied, the vegetation was destroyed, animal and plant habitats were influenced, and the natural hydrological, geological, and geomorphological conditions were also destroyed. ... to study the distribution of preferential flow within the soil profile; …
Wet Flow Enhancement, Flow Aids
Wet Flow Enhancement. Moving wet coal or other ores through material handling units can prove to be challenging. The increased surface moisture creates stronger hydrogen bonds between the coal or ore particles that …
Underground Mining Electrical & Electronics …
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Design of Low Carbon AC/DC Distribution Network for Coal Mines …
The goal of "optimizing coal mine energy consumption" is clearly proposed in the intelligent coal mine construction guide (2021 version). In the "Evaluation and Management Measures for Intelligent Construction of Coal Mines" (2023 version) issued by Shanxi Province, it is explicitly mentioned that "green energy such as photovoltaic, wind, …
Dependence of fluid flow on cleat aperture distribution and …
Dimensions and mutual relationships amongst fracture (cleat) parameters such as maximum aperture width, average aperture width, length, spacing etc. control the connectivity within a fracture network and the fluid flow in a coal seam as the matrix permeability, here, is negligible. In this paper, we document cleat size distributions and …
Numerical analysis on spatial distribution for concentration …
1. Introduction. Fully mechanized mining faces are common production sites in Chinese coal mines. In recent years, as fully mechanized mining equipment becomes heavier and larger, the amount and concentration of dust generated during coal mining and transportation have surged dramatically [1, 2, 3].The amount of coal dust generated in …
Belt Feeders & Belt Feeder Conveyor Systems
Click to Request a Quote or call us at 843.519.1651. Belt feeders and short belt conveyors that are ideal for handling light, fine and free flowing materials with a controlled belt speed. Primarily used for materials such …
Optimization of Ventilating Energy Distribution for Controlling Coal
Once an explosion occurs, there will be heavy casualties. Underground coal mine explosions are mainly caused by the following factors: The accumulation of flammable gases represented by coal gases ...
Distribution of H2S in the 10103 excavation working face of …
Origin of H 2 S in the coal seam of the Baozigou mine Analysis of H 2 S genetic type. A previous study on the origin of H 2 S in coal seams 14 revealed five main sources of H 2 S: thermochemical ...