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Heat release rate measurements of burning mining vehicles in an underground mine
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (MERO)ORCID iD: 0000-0002-8326-2860
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (MERO)
2013 (English)In: Fire safety journal, ISSN 0379-7112, E-ISSN 1873-7226, Vol. 61, 12-25 p.Article in journal (Refereed) Published
Abstract [en]

Heat release rates from two full-scale fire experiments with mining vehicles in an underground mine are presented. The mining vehicles involved were a wheel loader and a drilling rig typical for mining operations. The calculated peak heat release rate of the loader was 15.9 MW and occurred after approximately 11 min from ignition. The calculated peak heat release rate of the drilling rig was 29.4 MW and occurred after approximately 21 min from ignition. The heat release rate was calculated from measured data of gas concentrations of oxygen, carbon monoxide and carbon dioxide, measured gas velocity and measured gas temperatures. The fuel load of the wheel loader consisted mainly of the tyres, the hydraulic oil and the diesel fuel. The fuel load of the drilling rig consisted mainly of the hydraulic oil and the hydraulic hoses. The calculated heat release rate curves were controlled by comparing the summed up energy contents of the participating components with the integrated heat release rate curves. © 2013 Elsevier Ltd.

Place, publisher, year, edition, pages
2013. Vol. 61, 12-25 p.
Keyword [en]
Full-scale fire experiment, Heat release rate, Mining vehicle, Underground mine
National Category
Engineering and Technology Energy Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-21441DOI: 10.1016/j.firesaf.2013.08.009ISI: 000327365700002Scopus ID: 2-s2.0-84883339568OAI: oai:DiVA.org:mdh-21441DiVA: diva2:647975
Available from: 2013-09-13 Created: 2013-09-13 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Study of heat release rates of mining vehicles in underground hard rock mines
Open this publication in new window or tab >>Study of heat release rates of mining vehicles in underground hard rock mines
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A unique study on fire safety in hard rock underground mines with focus on heat release rates of mining vehicles is presented. A literature inventory was conducted with respect to fires in underground hard rock mines, which revealed that the most common fire cause in underground mines was flammable liquid sprayed onto hot surface and the most common fire object was a vehicle. A major concern was the lack of documented fire experiments in mining vehicles and heat release rate curves. It also revealed the limited research carried out on fire safety and fire development on vehicles found in hard rock underground mines.

In order to fill the gap of knowledge lack on heat release rates, fire experiments were carried out on wood cribs and wooden pallets in a model-scale tunnel with longitudinal ventilation where the distance between the fuel items were kept constant as well as varied. Different ignition criteria were applied in the ensuing calculations. It was found that the critical heat flux criterion generally showed very good agreement with the corresponding results of performed fire experiments but tended to have too short ignition times when the distance between the fuel items was increased. The ignition temperature criterion generally performed poorly compared with the measured results, but it was found that the accuracy improved considerably as the distance between the fuel items and the amount of energy accumulated on the fuel surface was increased.

As a final approach, two full-scale fire experiments were carried out in an operative underground mine using a wheel loader and a drilling rig respectively. The resulting heat release rates of the experiments were compared with calculated overall heat release rates applying the different ignition criteria. It was found that the critical heat flux criterion resulted in ignition times very close to the observed ignition times. The ignition temperature criterion resulted in surface temperatures that never achieved the corresponding ignition temperatures. Some difficulties were experienced when calculating the heat release rate curve of the wheel loader, as it was difficult to accurately predict the mechanical failure of a significant part initiating the highly significant fire in the hydraulic oil. Additional heat terms were added to the heat balance, where the added flame radiation term was found to have a large impact on the output results while the heat loss terms were found to have very little effect.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2015
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 178
National Category
Other Engineering and Technologies not elsewhere specified
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-27776 (URN)978-91-7485-201-1 (ISBN)
Public defence
2015-05-27, Delta, Västerås, 13:15 (English)
Opponent
Supervisors
Available from: 2015-04-02 Created: 2015-03-31 Last updated: 2015-06-29Bibliographically approved

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