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Modeling the effect of barometric pressure changes on spontaneous heating in bleederless longwall panels.

Authors
Yuan-L; Smith-AC
Source
Trans Soc Min Metal Explor TP-10-003, 2011 Jan; 328:485-492
NIOSHTIC No.
20038054
Abstract
Barometric pressure changes affect air density, leading to change in the mass of the gas in the gob. When the barometric pressure decreases, the volume of gas in the gob expands, while the volume of gas contracts when the barometric pressure increases, a process which causes the gob to "breathe" out and in. Although the concept of gob "breathing" is simple, its effect on spontaneous heating of coal in the gob area is not clear. In this study, computational fluid dynamic (CFD) simulations were conducted to model the spontaneous heating of coal in the longwall gob area under measured barometric pressure changes. A single longwall panel using a bleederless ventilation system was simulated. If there is no barometric pressure change, the intake airflow rate is equal to the return airflow rate. When the barometric pressure changes, these two airflow rates are no longer equal, and the difference between the two airflow rates represents the airflow rate the gob breathes in and out. The effect of inflow and outflow of gas on the potential spontaneous heating in the gob was investigated using the CFD model developed in our previous study. The effect of barometric pressure changes on the spontaneous heating was found to be dependent on the gob permeability and the coal oxidation rate. The effect of barometric pressure changes on oxygen concentrations in the gob was also examined.
Keywords
Mining-industry; Underground-mining; Air-pressure; Ventilation; Models; Coal-mining; Longwall-mining; Author Keywords: Air-flow; Oxidation; Oxidative-processes; Models
CODEN
TMENAE
Publication Date
20110101
Document Type
Journal Article
Fiscal Year
2011
NTIS Accession No.
NTIS Price
ISSN
1075-8623
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Transactions of the Society for Mining, Metallurgy, and Exploration
State
PA; CO; GA
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