Face Ventilation on a Bleederless Longwall Panel

Schatzel, Steven J.; Gangrade, V.; Addis, James D.; Hollerich, C. A.; Chasko, Linda L.

doi:10.1007/s42461-019-0049-7

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…OD in size and was attached to permissible SKC, Inc. Aircheck 224-44XRM vacuum pumps. This sampling method has also been reported previously in greater detail [2, 3, 13, 14].…”

Section: Experimental Methodologymentioning

confidence: 81%

“…This approach permitted the volumes of the tracer gas released and the duration of monitoring to be optimized for each test. The methodology for this tracer gas approach has been described in greater detail in previous publications by the US Bureau of Mines and NIOSH [2, 3, 9–12].…”

Section: Experimental Methodologymentioning

confidence: 99%

“…Samples were drawn from the bottle samples and analyzed using a modification of NIOSH Method 6602 by a Shimadzu GC8 with an electron capture detector [24]. The GC configuration was discussed previously [2, 3, 13, 14]. The limit of quantification for the GC method is about 1 ppb SF 6 in air.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…National Institute for Occupational Safety and Health (NIOSH) ventilation researchers sought to identify flow paths of ventilation airflow on longwall panels with variations in roof caving characteristics and longwall face lengths. To achieve this goal, three field sites were chosen of varying face lengths and caving characteristics; 228-m (750 ft) face length with bleeder ventilation (bleeder shaft) and caving up to the shields (this study), 305-m (1000 ft) face length with bleederless ventilation and caving up to the shields [2], and 381-m (1250 ft) face length and bridging void space behind longwall shields [3, 4]. In addition to the field studies, the research team also investigated the important aspects of longwall ventilation using numerical modeling and scaled physical modeling.…”

Section: Introductionmentioning

confidence: 99%

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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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“…OD in size and was attached to permissible SKC, Inc. Aircheck 224-44XRM vacuum pumps. This sampling method has also been reported previously in greater detail [2, 3, 13, 14].…”

Section: Experimental Methodologymentioning

confidence: 81%

Section: Experimental Methodologymentioning

confidence: 99%

Section: Experimental Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Compared with the entire gob, the gap between the caving rock and the residual coal in the working face is small, and the internal space is connected to each other. According to the definition of porous media, it can be considered that the caving rock in the gob and the residual coal in the working face have the characteristics of porous media, and the theory of porous media is used to study the law of gas flow in the gob.…”

Section: Evolution Law Of the Permeability Characteristics Of The Gobmentioning

confidence: 99%

Evolution and application of airflow permeability characteristics of gob in roof cutting and pressure releasing mining method

Chen

Wang

et al. 2020

Energy Science & Engineering

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Cutting roof and release pressure technology has changed the pressure transmission mode of the roof and the caving characteristics of roof rock, which in turn has changed the permeability evolution of the gob. To obtain the permeability characteristics of the gob for the roof cutting and pressure releasing mining method, a mathematical model for the gob voidage and permeability was established by analyzing the overlying strata movement law and the lateral stress variation in the gob. The airflow migration law of haulage roadway 12 201 in Halagou coal mine was studied using Fluent software and an established mathematical model. The main conclusions obtained are as follows: The overburden pressure and lateral stress in the gob gradually increase with the advancement of the working face; along the direction of the retaining roadway, there are two roadway windflows entering the critical zones (the 22-100 m and 390-398 m sections). The inflow at these two sections accounted for 59% of the total air inflow, of which the most critical is the 28-53 m section, which accounts for 43% of the total air inflow in the two severe air leakage sections. The findings of this work provide a theoretical basis for the implementation of antileakage technology in the gob under the roof cutting and pressure releasing mining method and help reduce the risk of spontaneous combustion in the gob. K E Y W O R D Scaving characteristics of roof rock, cutting roof and release pressure, gob, voidage and permeability model 2074 |

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