Determination Of The Minimum Ignition Energy On Different Devices (original) (raw)
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Ignition behavior of dusts: Meaning and interpretation
Process Safety Progress, 1995
The minimum ignition energy and minimum ignition temperature of dust-airmixtures are important technical safety indices. They are used for the assessment of the efficacy of the ignition sources expected in dust-air mixtures. First of all, the test apparatus and the determination procedures are introduced, including the signifcant parameters on the mentioned indices. Finally, the correlations are described between-the minimum ignition energy and the efficacy of electrostatic sparks,-the minimum ignition energy and the minimum ignition temperature and the mechanically generated sparks on the on hand, the limiting oxygen concentration and the limiting gap width of combustible dusts on the other hand,-the minimum ignition temperature and hot steel surfaces (mechanically generated hot surfaces) or glowing particle nests surfaces. no ignition < MIE < ignition
Procedia Engineering, 2012
The paper presents an analysis of the minimum ignition temperature of dust layer and the minimum ignition temperatures of dust clouds. Tests have been performed for selected dusts: hop, lemon balm, nettle, senna fruit, valerian, buckwheat, barley, semolina, cornflakes, oatmeal, rice flakes, flour, malt, beech, dried carrot, corn starch and sunflower husk. Tests have been performed in accordance with EN 50281-2-1. Method A consists in determining the minimum temperature at which ignition occurs of dust and/or its decomposition on a hot plate at a constant temperature. The study is used to identify the threats from industrial equipment and construction, which while working have hot surfaces, on which can create a layer of combustible dust. Method B is used for determining the minimum ignition temperature of a dust cloud or other particulate solids. Method B is complementary to the method A. It is used in relation to industrial equipment, inside which dust may exist in the form of short-term cloud.
Measurement of minimum ignition energies of dust clouds in the <1 mJ region
Journal of Hazardous Materials, 2007
The lower energy limit of current standard test apparatus for determining the minimum ignition energy (MIE) of dust clouds is in the range of 1–3mJ. This is a quite severe limitation because many dusts ignite readily at this energy level. A new spark generator, capable of producing synchronised sparks of very low energies and with an integrated system for measurement
Effect of particle size reduction due to dust dispersion on minimum ignition energy (MIE)
Powder Technology, 2019
The 20-L dust explosion apparatus is widely used for dust explosion risk assessment, however the 1-m 3 apparatus remains the gold standard for explosion testing by generating a turbulent dust cloud consistent with industrial scenarios. Recent studies show a 1-m 3 dispersion leads to particle breakage, which can impact risk assessment. However, the effect of particle breakage on explosion risk assessment is not quantified. The focus of this work is to measure particle breakage in a 1-m 3 and to quantify the effect of resulting particle size distribution shift on the explosion risk assessment by measuring change in the minimum ignition energy (MIE). We observed Ascorbic Acid particle size reduction in a 1-m 3 , resulting in a reduced post-dispersion MIE as compared to the pre-dispersion sample. This work aims to create awareness of dust particle breakage to improve the risk assessment process, to better prevent incidents.
Determination of Fire and Explosion Characteristics of Dust
TRANSACTIONS of the VŠB – Technical University of Ostrava, Safety Engineering Series, 2016
The aim of this paper is to approximate danger of dust clouds normally occur by determining their explosion characteristics. Nowadays, dusty environment is phenomenon in the industry. In general, about 70% of dust produced is explosive. Dust reduction in companies is the main purpose of the national and European legislative. Early identification and characterization of dust in companies may reduce the risk of explosion. It could be used to identify hazards in industrial production where an explosive dust is produced. For this purpose several standards for identification and characterization of explosion characteristics of industrial dust are being used.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2014
This paper presents the results of the minimum ignition temperature of dust layer and cloud of dusts. Tests have been performed for selected dusts obtained from European and exotic wood species. Tests have been performed in accordance with EN 50281-2-1. Method A consists in determining the minimum temperature at which ignition occurs of dust and/or its decomposition on hot plate at a constant temperature. The study is used to identify the threats from industrial equipment and construction, which while working have hot surfaces, on which can create a layer of combustible dust. Method B is used for determining the minimum ignition temperature of dust cloud or other particulate solids. Method B is complementary to the method A. It is used in relation to industrial equipment, inside which dust may exist in the form of short-term cloud. The results obtained for finer dusts, i.e. 200 and 71 μm were nearly equal. The differences reaching from 10 to 30°C were observed for dust samples of mean diameter finer than 71 μm. Based on conducted research, it is possible than to order particular types of dusts according to diminishing minimum temperature of dust cloud/layer ignition as follows: oak dust ≥ eucalyptus dust > lapacho dust.
Sensitivity to ignition by electrostatic discharge of explosive dust / air
MATEC Web of Conferences
In industrial sectors that use, process, transport or store, substances such as combustible dusts could exist some workplaces with explosion hazard due to the possibility of dust/air explosive formation and ignition, both inside the installations and in the surrounding atmosphere. Methods and means of protection aim to prevent the development of explosive atmospheres, followed by preventing the occurrence of ignition sources and then limiting the effects of explosions. To assess the risk of ignition of the explosive atmosphere, there must be known first of all, the explosive atmosphere’s sensitivity to ignition by electrostatic discharge, respectively, the minimum ignition energy of the explosive mixture, afterwards being required an analysis on the possibilities of formation and discharge of electrostatic charge. For the most common combustible dusts, the minimum ignition energy is given, but for new types of flammable substances this parameter defining the sensitivity to ignition ...
Minimum Ignition Temperature of Wood Dust Layers
Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2013
Fire characteristic (properties) are used to determine the fire risk and explosion hazard of materials. They are defined as numerical values which describe behavior in the process of burning. They can be determinate by standardized test methods. In this paper is described the most important fire technical characteristic of dust layer (minimum ignition temperature) and the results of standard laboratory method determination for wood dusts, aswell.