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Mining Publication: Impact of Air Velocity on the Detection of Fires in Conveyor Belt Haulageways
Keywords: Conveyors Fire sensors Fires Smoke detection Smoke sensors
Original creation date: May 2011
Authors: E Perera, CD Litton
Peer Reviewed Journal Article - May 2011
Download PDF Document (0.24 MB)
NIOSHTIC2 Number: 20038903
Fire Technol 2011 May; 47:Epub Ahead of Print
A series of large-scale experiments were conducted in an above-ground fire gallery using three different types of fire-resistant conveyor belts and four air velocities for each belt. The goal of the experiments was to understand and quantify the effects of air velocity on the detection of fires in underground conveyor belt haulageways and to determine the rates of generation of toxic gases and smoke as a fire progresses through the stages of smoldering coal, flaming coal, and finally a flaming conveyor belt. In the experiments, electrical strip heaters, imbedded approximately 5 cm below the top surface of a large mass of coal rubble, were used to ignite the coal, producing an open flame. The flaming coal mass subsequently ignited 1.83-m-wide conveyor belts located approximately 0.30 m above the coal surface. Gas samples were drawn through an averaging probe for continuous measurement of CO, CO2, and O2 as the fire progressed. Approximately 20 m from the fire origin and 0.5 m below the roof of the gallery, two commercially available smoke detectors, a light obscuration meter, and a sampling probe for measurement of total mass concentration of smoke particles were placed. Two video cameras were located upstream of the fire origin and along the gallery at about 14 m and 5 m in order to detect both smoke and flames from the fire. This paper discusses the impact of ventilation airflow on alarm times of the smoke detectors and video cameras, CO levels, smoke optical densities and smoke obscuration, total smoke mass concentrations, and fire heat release rates, examining how these various parameters depend upon air velocity and air quantity, the product of air velocity, and entry cross section.
Image of publication Impact of Air Velocity on the Detection of Fires in Conveyor Belt HaulagewaysPeer Reviewed Journal Article - May 2011
Download PDF Document (0.24 MB)
NIOSHTIC2 Number: 20038903
Fire Technol 2011 May; 47:Epub Ahead of Print
See Also
CFD Modeling of Fire Spread Along Combustibles in a Mine Entry
A Comparison of Mine Fire Sensors
Fire Control and Suppression
Fire Detection
In-Mine Evaluation of Smart Mine Fire Sensor
In-Mine Evaluation of Smoke Detectors
In-Mine Evaluation of Underground Fire and Smoke Detectors
Mine Fire Source Discrimination Using Fire Sensors and Neural Network Analysis
Multiple Type Discriminating Mine Fire Sensors
Rapid Detection and Suppression of Mining Equipment Cab Fires
Smoke, Carbon Monoxide, and Hydrogen Chloride Production from the Pyrolysis of Conveyor Belting and Brattice Cloth
Technology News 498 - Multiple Fire Sensors for Mine Fire Detection and Nuisance Discrimination
Page last reviewed: November 15, 2016
Page last updated: November 15, 2016
Content source: National Institute for Occupational Safety and Health, Mining Program
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