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Impact of air velocity on the detection of fires in conveyor belt haulageways.

Authors
Perera-IE; Litton-CD
Source
Fire Technol 2012 Apr; 48(2):405-418
NIOSHTIC No.
20038903
Abstract
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 5cm 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 0.30m 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 20m from the fire origin and 0.5m 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 14m and 5m 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.
Keywords
Fire-prevention; Fire-proofing; Fire-retardants; Fire-resistant-materials; Fire-hazards; Fire-protection; Fire-safety; Air-flow; Testing-equipment; Equipment-design; Equipment-reliability; Quantitative-analysis; Mine-fires; Mining-equipment; Mining-industry; Coal-mining; Control-equipment; Environmental-control-equipment; Toxic-gases; Smoke-control; Underground-mining; Ignition-sources; Particle-aerodynamics; Gas-sampling; Ventilation; Warning-signals; Air-monitoring; Airborne-particles; Author Keywords: Air velocity; Conveyer belt; Coal; Fire detection; Alarm level
CODEN
FITCAA
CAS No.
630-08-0; 124-38-9; 7782-44-7
Publication Date
20120401
Document Type
Journal Article
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Issue of Publication
2
ISSN
0015-2684
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Fire Technology
State
PA
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