Field test of a perfluoromethylcyclohexane (PMCH) permeation plug release vessel (PPRV) in an underground longwall mine

Jong, Edmund C.; Luxbacher, Kray; Karmis, M.; Westman, Erik

doi:10.1179/1743286315y.0000000012

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Researchers have also used advanced fracture modeling using discrete fracture network (DFN) based on random and discrete nature of fractures in the longwall gob and multidimensional reservoir modeling [15][16][17]. Field studies are one the most effective and accurate way to investigate longwall ventilation; investigations have been conducted using a variety of research approaches including tracer gas studies, atmospheric monitoring, and ventilation surveys [18][19][20]. Physical modeling research approach is widely used in aeronautic, automobile, construction, and defense industries, but there have been few investigations to investigate mine ventilation systems.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Impact of Caving on Longwall Mine Ventilation Using Scaled Physical Modeling

Gangrade

Schatzel

Harteis

et al. 2019

Mining, Metallurgy & Exploration

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In longwall mining, ventilation is considered one of the more effective means for controlling gases and dust. In order to study longwall ventilation in a controlled environment, researchers built a unique physical model called the Longwall Instrumented Aerodynamic Model (LIAM) in a laboratory at the National Institute for Occupational Safety and Health (NIOSH) Pittsburgh Mining Research Division (PMRD) campus. LIAM is a 1:30 scale physical model geometrically designed to simulate a single longwall panel with a three-entry headgate and tailgate configuration, along with three back bleeder entries. It consists of a two-part heterogeneous gob that simulates a less compacted unconsolidated zone and more compacted consolidated zone. It has a footprint of 8.94 m (29 ft.) by 4.88 m (16 ft.), with a simulated face length of 220 m (720 ft.) in full scale. LIAM is built with critical details of the face, gob, and mining machinery. It is instrumented with pressure gauges, flow anemometers, temperature probes, a fan, and a data acquisition system. Scaling relationships are derived on the basis of Reynolds and Richardson numbers to preserve the physical and dynamic similitude. This paper discusses the findings from a study conducted in the LIAM to investigate the gob-face interaction, airflow patterns within the gob, and airflow dynamics on the face for varying roof caving characteristics. Results are discussed to show the impact of caving behind the shields on longwall ventilation.

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Section: Introductionmentioning

confidence: 99%

Investigating the Impact of Caving on Longwall Mine Ventilation Using Scaled Physical Modeling

Gangrade

Schatzel

Harteis

et al. 2019

Mining, Metallurgy & Exploration

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“…Pandey et al and Singh et al investigated the air leakage rates through ventilation stoppings using SF 6 [15,16]. Jong et al, Watkins et al, and Xu et al utilized perfluoromethylcyclohexane (PMCH) to investigate mine ventilation systems [17–19].…”

Section: Introductionmentioning

confidence: 99%

A Field Study of Longwall Mine Ventilation Using Tracer Gas in a Trona Mine

Gangrade

Schatzel

Harteis

2019

Mining, Metallurgy & Exploration

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A ventilation research study was conducted by the National Institute for Occupational Safety and Health and a cooperating trona mine in the Green River basin of Wyoming, USA. The mine operation uses the longwall mining method in trona bed 17, a commonly mined unit in the region. The longwall face length is 228 m (750 ft), and caving on the face occurred up to the back of the longwall shields. The mine is ventilated using a main blowing fan and a bleeder shaft. For this study, sulfur hexafluoride (SF 6) tracer gas was released in two separate monitoring experiments. For the first experiment, tracer gas was released on the face, this test focused on airflow along the longwall face of the active panel. Face test showed the airflow patterns to be more complex than just head-to-tail flow in the main ventilation air stream on the active panel. For the second experiment, tracer gas was released 2 crosscuts inby the face on the headgate side, this test focused on gas transport in the mined-out portion of the same active panel. Gob test showed a pathway of movement through the front of the active panel gob that moved outby from the tailgate corner. The primary pathway of tracer gas movement in the active panel gob was towards the headgate and tailgate bleeders and out of a bleeder shaft. The rate of movement towards the back of the gob was measured to be 0.19 m/s (37 fpm).

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Field test of a perfluoromethylcyclohexane (PMCH) permeation plug release vessel (PPRV) in an underground longwall mine

Cited by 2 publications

References 12 publications

Investigating the Impact of Caving on Longwall Mine Ventilation Using Scaled Physical Modeling

Investigating the Impact of Caving on Longwall Mine Ventilation Using Scaled Physical Modeling

A Field Study of Longwall Mine Ventilation Using Tracer Gas in a Trona Mine

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