Abstract
Although the first research in the field was carried out by Davy in 1816, the first discovery emerged in 1891 when Le Chatellier defined the law for determining the explosive limits. Lower Explosive Limit (LEL) represents the lowest concentration of gas or vapours in air which is able to generate the explosion in the presence of an efficient ignition source. It is considered to be the same as the Lower Flammability Limit (LFL). Upper Explosive Limit (UEL) represents the highest concentration of gas or vapours in air which is able to generate the explosion in the presence of an efficient ignition source. It is considered to be similar with the Upper Flammability Limit (UFL) [1]. For the optimal management of underground or surface industrial environments, confined, obstructed or open environments, is required to know the point which defines the monitored atmosphere in relation with the explosion triangle. For confined underground environments, monitoring the atmosphere and using the explosibility diagrams are required during the closure process and also for re-opening the area. For underground environments specific to active mine workings and for industrial environments located on the surface, monitoring the atmosphere and using explosibility diagrams are required permanently.
Highlights
The first research in the field was carried out by Davy in 1816, the first discovery emerged in 1891 when Le Chatellier defined the law for determining the explosive limits
The point defining the monitored atmosphere X (Effective inert, Effective fuels) in our case X (43.51; 7.03), is located outside the explosive areas A1 and A2 explosive according to the value of parameter R, in the area of non-explosive mixtures. but which can become explosive by the addition of air, Figure 3
All the listed risks can occur if three factors are overlapping in time and space, namely: fuel, oxygen and source of initiation
Summary
For the optimal management of the underground or surface industrial environments, semiclosed or open closed environments, it is necessary to know the position of the point that defines the monitored atmosphere in relation to the explosive triangle [2,3,4]. For the underground environments specific to the active mining works as well as for the industrial surfaces from the surface, the monitoring of the atmosphere as well as the use of explosive diagrams are permanently required [5,6,7,8]. A gas composition specific to the closed industrial environments for which explosive diagrams are used is given and analysed
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