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Design fires in underground hard rock mines
Mälardalen University, School of Sustainable Development of Society and Technology. (Safety Science Lab)ORCID iD: 0000-0002-8326-2860
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

During several decades considerable research activities have been conducted with respect to fires in coal mines, but the research activities with respect to hard rock mines have been limited. As the hard rock mines are getting more complex the need for deeper understanding of fires in underground hard rock mines are getting more in demand. The more urgent demands are the need for more specific heat release rate curves as design fires, applicable fire experiments and any method that would allow for the calculation of the total heat release rate curve of an object. This thesis presents a number of examples on design fire curves applicable to underground hard rock mines; it also presents the results of model scale fire experiments and methods for calculating the total heat release rate of several objects at uniform as well as non-uniform conditions. Tests were carried out in a model scale tunnel using wooden pallets as fire load. The parameters tested were the distance between piles of pallets and longitudinal ventilation rate. It was found that an increasing ventilation rate also increases the peak heat release rate. When studying the curves of heat release rates it was found that when the distance between the ignited pile and the second pile increased to a certain level the delayed ignition of the second pile will result in that the peak heat release rate of the adjacent piles will not occur simultaneously. The ignition data indicated that the ignition time of adjacent piles decreased as the longitudinal ventilation increased.  A method using a critical heat flux as ignition criterion exhibited very good agreement with the corresponding experiments for both uniform as well as non-uniform conditions. The methods using the ignition temperature as ignition criterion did not agree very well with any of the corresponding experiments.

Place, publisher, year, edition, pages
Västerås: Mälardalen University , 2011. , 86 p.
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 127
Keyword [en]
Design fire, underground, hard rock mine, vehicle fire, smoke spread
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-11297ISBN: 978-91-7485-000-0 (print)OAI: oai:DiVA.org:mdh-11297DiVA: diva2:382996
Presentation
2011-01-28, Gamma, Mälardalens högskola, Västerås, 13:00 (English)
Opponent
Supervisors
Projects
GRUVAN
Available from: 2011-01-04 Created: 2011-01-03 Last updated: 2014-01-07Bibliographically approved
List of papers
1. An Engineering tool to calculate heat release rates of multiple objects in underground structures
Open this publication in new window or tab >>An Engineering tool to calculate heat release rates of multiple objects in underground structures
2011 (English)In: Fire safety journal, ISSN 0379-7112, Vol. 46, no 4, 194-203 p.Article in journal (Refereed) Published
Abstract [en]

Simple theoretical calculations of the overall heat release rate (HRR) of multiple objects have been carried out. The results were compared to fire experiments in a model tunnel using wood cribs placed at equal distance from each other. Three different methods are presented which are based on physical relations for fire spread between the wood cribs. The first method uses a critical heat flux as ignition criteria while the other two methods use an ignition temperature. The method using the critical heat flux as ignition criteria shows very good agreement with the corresponding experimental results used. The two methods using the ignition temperature as ignition criteria did not agree well with the corresponding experimental results. The prerequisites, that the methods should be kept relatively simple to be of practical use and that the burning objects should not necessarily have to be of uniform composition, were fulfilled.

National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-11304 (URN)10.1016/j.firesaf.2011.02.001 (DOI)000290137300005 ()2-s2.0-79952988887 (Scopus ID)
Projects
GRUVAN
Note
http://www.sciencedirect.com/science/journal/03797112Available from: 2011-01-04 Created: 2011-01-04 Last updated: 2015-04-02Bibliographically approved
2. Overview of fire and smoke spread in underground mines
Open this publication in new window or tab >>Overview of fire and smoke spread in underground mines
2010 (English)In: Proceedings from the fourth international symposium on tunnel safety and security, Frankfurt am Main, Germany, March 17-19, 2010 / [ed] Anders Lönnermark & Haukur Ingason, Borås: SP Fire Technology , 2010, 483-494 p.Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Borås: SP Fire Technology, 2010
Keyword
Fire spread; smoke spread; underground mine; vehicle fire; fire modelling; ventilation network simulation program.
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-9452 (URN)
Conference
Fourth international symposium on tunnel safety and security
Projects
GRUVAN
Available from: 2010-04-26 Created: 2010-04-05 Last updated: 2015-04-02Bibliographically approved
3. Heat Release Rates of Multiple Objects at Varying Distances
Open this publication in new window or tab >>Heat Release Rates of Multiple Objects at Varying Distances
2012 (English)In: Fire safety journal, ISSN 0379-7112, E-ISSN 1873-7226, Vol. 52, 1-10 p.Article in journal (Refereed) Published
Abstract [en]

Simple theoretical calculations of the overall heat release rate (HRR) of multiple objects at both constant and varying distances have been carried out. The results were compared to both fire experiments in a longitudinal ventilated model tunnel (scale 1:15) using piles of wooden pallets placed at varying distance from each other and with model scale fire experiments (scale 1:4) conducted with a freight truck commodity without roof over the piles of wooden pallets. Two different methods are presented which are based on physical relations for fire spread between the piles of wooden pallets. The first method uses a critical heat flux as ignition criteria while the other method uses an ignition temperature. The method using the critical heat flux as ignition criteria shows very good agreement with the corresponding experimental results used. The method using the ignition temperature as ignition criteria did not agree well with the corresponding experimental results. The prerequisite that the burning objects should not necessarily have to be positioned at equal distance was fulfilled.

National Category
Other Engineering and Technologies
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-11305 (URN)10.1016/j.firesaf.2012.03.007 (DOI)000307132800001 ()2-s2.0-84860509088 (Scopus ID)
Projects
GRUVAN
Available from: 2011-01-04 Created: 2011-01-04 Last updated: 2017-09-27Bibliographically approved

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