Numerical Studies of Ventilation Effect on Methane Layering Behaviour in Underground Coal Mines

Kumar, P. K. Vinod; Mishra, Devi Prasad; Panigrahi, Durga Charan; Sahu, Patitapaban

doi:10.18520/cs/v112/i09/1873-1881

Cited by 14 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…В работах [2][3][4][5][6][7][8][9][10][11][12] применялось CFD-моделирование для исследования динамики ядовитых и взрывоопасных газов в выработанном пространстве длинных очистных забоев, а также в горных выработках рабочих зон. Как правило, в существующих работах построение моделей осуществлялось на основании расчета проницаемости и пористости выработанного пространства [3,4,6].…”

Section: рис 2 продольные трещины в целиках (вид с торцов)unclassified

Оценка Интенсивности Просачивания Газа Из Выработанного Пространства Через Трещину В Межстолбовом Целике И Солебетонной Перемычке

Колесов¹

2021

Гор. эхо

View full text Add to dashboard Cite

Горный институт УрО РАН, г. Пермь Аннотация. В статье приведена оценка скорости и расхода воздуха из выработанного пространства через узкую поперечную щель в межстолбовом целике и солебетонной перемычке в предположении ламинарного характера движения газовоздушной среды. Получены зависимости средней скорости воздуха через щель от приложенного перепада давления при разных мощностях целика и толщинах перемычки.Ключевые слова: выработанное пространство, газопроницаемость, бесцеликовая выемка, солебетонная перемычка. ВведениеПодземная добыча калийной руды на рудниках ОАО «Беларуськалий» осуществляется длинными очистными забоями или лавами с применением шнековых комбайнов в составе очистных механизированных комплексов. При этом актуальной задачей является сокращение потерь полезного ископаемого в охранных межстолбовых целиках, в связи с чем одним из направлений совершенствования технологии отработки калийных пластов является сокращение размеров межстолбовых целиков или их полная выемка. Для реализации этой идеи разработаны технологические схемы бесцеликовой выемки полезного ископаемого.Пример технологической схемы бесцеликовой выемки представлен на рис. 1 [1].Рис. 1. Схема выработок столба лавы. 1 -транспортный штрек; 2 -конвейерный штрек; 3 -вспомогательный штрек; 4 -закладочный штрек; 5 -вентиляционный штрек; 6 -транспортный штрек соседнего отработанного столба; 7 -лава; 8 -направление отработки столба; 9 -технологическая сбойка

show abstract

Section: рис 2 продольные трещины в целиках (вид с торцов)unclassified

Оценка Интенсивности Просачивания Газа Из Выработанного Пространства Через Трещину В Межстолбовом Целике И Солебетонной Перемычке

Колесов¹

2021

Гор. эхо

View full text Add to dashboard Cite

show abstract

“…Ventilation is an important safety configuration for underground coal mines. It significantly affects the behavior of methane layering and dispersion of methane which may lead to an explosion hazard [1]. The dust, CO and CO 2 concentrations are also affected by ventilation [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The dust, CO and CO 2 concentrations are also affected by ventilation [2,3]. As one of the key parameters of coal mine ventilation, air velocity (or air flowrate) is usually set to certain range to ensure the effectiveness of ventilation [1,4]. Common ways of monitoring air velocity involve detecting the air velocity with sensors, such as vane flow meter, hot-wire anemometer and Pitot tube flow meter.…”

Section: Introductionmentioning

confidence: 99%

An Air Velocity Monitor for Coal Mine Ventilation Based on Vortex-Induced Triboelectric Nanogenerator

Shen

et al. 2022

Sensors

View full text Add to dashboard Cite

Air velocity of coal mine ventilation is an important consideration that may cause serious damage. This paper proposes a simple, low cost and effective air velocity monitor (AVM) for coal mine ventilation. The AVM uses the lock-in characteristic of vortex-induced vibration (VIV) to sense the air velocity. Amplitude of the VIV is converted into frequency signal of a vortex-induced triboelectric nanogenerator (VI-TENG) to improve the durability. Structure of the AVM are designed, and parameters of the AVM are optimized with experiments. For the upper and lower air velocity thresholds of 3.1 and 3.6 m/s, the optimized flexible beam length, slider weight, electrode space and electrode width are 42.5 mm, 0.4 g, 0.2 mm and 0.5 mm, respectively. Experiments also show that the output frequency of the VI-TENG could represent the amplitude of VIV well with the correlation coefficient of 0.93. Durability test demonstrates that the AVM generates stable output frequency in 120,000 cycles. A prototype and its controller are fabricated. Wind tunnel tests of this prototype show that it can give alarm when the gas velocity goes above the upper threshold or below the lower threshold. The proposed AVM could be a good solution for simple and effective coal mine ventilation alarm.

show abstract

“…Works describing analyses of ventilation systems in mine headings have been presented in numerous publications [1,3,5,[20][21][22][23][24][25][26][27][28][29][30][31][32]. They encompassed both real-world tests [16,17,21,[24][25][26]29,31] and model-based analyses [1][2][3][4][5]10,20,23,27,28,30,[32][33][34][35][36][37]. In the authors' opinion, the works which are particularly interesting in this regard are those presenting the results of model-based tests related to the release of methane into mine headings.…”

Section: Introductionmentioning

confidence: 99%

“…They enunciated that methane concentration can be reduced below safe level by properly directing the ventilation flow to the location of methane accumulation. Mishra et al [2,10] and Kumar et al [27] concluded that ventilation plays a vital role in dispersion of methane and breaking methane layering to a safe level in underground coal mines. These authors examined and described the impact of selected geological and mining factors on the distribution of methane concentration levels in the tailgate [10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Impact of Auxiliary Ventilation Equipment on the Distribution and Concentration of Methane in the Tailgate

Tutak

Brodny

2018

Energies

View full text Add to dashboard Cite

Methane, which is commonly found in hard coal deposits, represents a considerable threat to the safety of mining operations in these deposits. The paper presents the results of tests, aiming to limit the negative impact of methane on hard coal exploitation and improve work safety. The tests encompassed an analysis of methane concentration distributions in the tailgate (in the intersection area with the longwall), with account being taken of auxiliary ventilation equipment. This equipment is responsible for reducing methane concentration levels in the intersection area between the longwall and the tailgate. The analyses presented in the article were conducted for a spatial model of a longwall area, using the Computational Fluid Dynamics (CFD) method. Account was taken of the real-world measurements of the headings as well as the measurement data concerning methane concentration and ventilation parameters. The tests took into account methane emissions from the mined coal and from the goaf with caving. The analyses were performed for the system with and without auxiliary equipment, for different velocities of the additional air stream. This made it possible to compare both systems and determine the impact of auxiliary equipment on the distribution and concentration of methane in the most vulnerable area of exploitation. The distributions of the air and gas mixture were also determined in the analysed headings and goaf with caving. The results obtained clearly demonstrate that using auxiliary equipment has a significant effect on the ventilation parameters of the air stream and leads to reduction in methane concentrations in the most vulnerable section of the longwall. These results also confirmed the advantages of auxiliary ventilation equipment, which should contribute to their wider application in underground hard coal exploitation.

show abstract

Numerical Studies of Ventilation Effect on Methane Layering Behaviour in Underground Coal Mines

Cited by 14 publications

References 0 publications

Оценка Интенсивности Просачивания Газа Из Выработанного Пространства Через Трещину В Межстолбовом Целике И Солебетонной Перемычке

Оценка Интенсивности Просачивания Газа Из Выработанного Пространства Через Трещину В Межстолбовом Целике И Солебетонной Перемычке

An Air Velocity Monitor for Coal Mine Ventilation Based on Vortex-Induced Triboelectric Nanogenerator

Analysis of the Impact of Auxiliary Ventilation Equipment on the Distribution and Concentration of Methane in the Tailgate

Contact Info

Product

Resources

About