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2 edition of Ignition energy of dust clouds and hybrid mixtures. found in the catalog.

Ignition energy of dust clouds and hybrid mixtures.

Randy Jay Sinukoff

Ignition energy of dust clouds and hybrid mixtures.

by Randy Jay Sinukoff

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Published .
Written in English


The Physical Object
Pagination182 leaves
Number of Pages182
ID Numbers
Open LibraryOL16355061M

A simple analytical method is presented for estimating the hybrid minimum ignition energy (HMIE) of dust–gas mixtures, based on the assumed generality of Bartknecht's well‐known test data for mixtures of propane with a series of dusts in air. The minimum ignition energy (MIE) of dust clouds is required to assess the electrostatic ignition risk. Recently, the growing number of accidents shows that fire and explosions occurring in fireworks industry are due to electrostatic discharge (ESD).

For ignition energy effect, results from methane/niacin mixture demonstrated that the MEC and LFL will not be affected by changing ignition energy. There is no distinguishable difference among gas explosion index (KG) and dust explosion index (KSt) derived from tests with every ignition energy ( kJ, 5 kJ and 10 kJ) in a 36 L vessel. Hybrid mixtures can have both gas and dust concentrations. Dr. Addai said that depending on the circumstances, he tries to either simulate whatever combustible material is being produced by the facility or run various appropriate tests instead of limiting himself to the worst-case scenario.

Conditions for an Explosion A dust cloud of any flammable material will explode where: 1 the concentration of dust in air falls within the explosive limits, and 2 a source of ignition of the required energy for that dust cloud is present. Conversely, an explosion can be prevented if one, or preferably both, of these conditions are avoided. In contrast, the effect of added series resistance on ignition of dust clouds can be to significantly reduce the stored energy required for ignition of dust clouds (Boyle & Llewellyn ). The MIE for granular aluminium and magnesium both decreased by a factor of about ten when series resistance of between 10 4 and 10 5 W were included in the.


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Ignition energy of dust clouds and hybrid mixtures by Randy Jay Sinukoff Download PDF EPUB FB2

Some authors proposed to estimate the minimum ignition energy of hybrid mixtures (HMIE) by assuming a semi-logarithmic relationship involving the gas concentration and the MIE ratio between the pure dust and the gas: (1) H M I E = e x p ln M I E dust − C C 0.

ln M I E dust M I E gas where MIE dust and MIE gas are respectively the MIE of Cited by:   Furthermore, Pellmont () also investigated the influence of combustible gas (propane) in the air on the minimum ignition energy of dust clouds and concluded that the ignition sensitivity of a combustible dust is boosted when fed with a small amount of flammable gas with a concentration below the lower explosion limit.

Hence, the effect of hybrid mixture explosions cannot Cited by: flammable gases and vapors, adds to the violence of a dust-air combustion." In certain circumstances, hybrid mixtures can be deflagrable, even if the dust is below the minimum explosion concentration.

Furthermore, dusts determined to be non-ignitable by weak ignition sources can sometimes be ignited when part of a hybrid mixture.

of methane on coal dust cloud explosions to understand the igni-tion and explosion properties of such hybrid mixtures. The effect of ignition energy on the explosion characteristics of coal dust has been studied by a number of people. Hertzberg et al., studied the characteristics of Pittsburgh seam coal dust.

standards referencing this book - (show below) - (hide below) din en determination of explosion characteristics of dust clouds - part 1: determination of the maximum explosion pressure p[max] of dust clouds determination of minimum ignition energy of dust/air mixtures: din en flameless explosion venting.

dust).The risk of dust and hybrid mixture explosion exists in systems where there are possibilities of simultaneous presence of an explosive dust/air mixture ignition. Dustand a source of and hybrid mixtures explosion could cause fatalities, injuries, property damage and environmental contamination problems [2].

In order toprevent and. A.3 Minimum Ignition Energy Test (MIE) 33 A.4 Minimum Ignition Temperature Test (Cloud) 34 A.5 Minimum Ignition Temperature Layer (MIT Layer) 35 t Explosion Severity Test (20 Litre Sphere Test)A.6 Dus 36 A.7 Limiting Oxygen Concentration Test (LOC) 37 A.8 Minimum Explosible Concentration (MEC) in the 20 litre sphere Sources of Ignition A dust explosion will occur only if a dust is dispersed in air or oxygen within the explosive range and if, at the same time, a suitable source of ignition is present.

Preventive measures are aimed at avoiding the presence of either, or preferably both, these factors in the system. In many cases, however, because of the heterogeneous nature of dust clouds and the difficulty.

external dust storage reservoir. The ignition delay time was fixed at 60 ms for all tests; ignition energy was 5 kJ for MEC determination and 10 kJ for P max/K St testing (in accordance with the relevant ASTM methodologies).

Hybrid mixture testing for the FPE samples was conducted with admixture of approximately 1 volume % ethylene to. of Dust Clouds ASTM E Standard Test Method for Minimum Explosible Concentration of Combustible Dusts ASTM E (): Standard Test Method for Minimum Ignition Energy of a Dust Cloud in Air ASTM E (): Standard Test Method for Minimum Autoignition Temperature of Dust Clouds 28 L Apparatus BAM Oven MIKE3 Apparatus.

A simple analytical method is presented for estimating the hybrid minimum ignition energy (HMIE) of dust-gas mixtures, based on the assumed generality of Bartknecht’s well-known test data for.

Minimum ignition energy (MIE) of a dust is one of the many characteristic parameters of a dust explosion and is associated with the probability of ignition of a dust cloud. For hybrid explosions, the hybrid MIE can be described as the lowest energy required to ignite a hybrid dust-gas cloud (Randeberg and Eckhoff, ).

In the case of hybrid mixtures testing, this protocol had to be slightly modified, as hybrid mixtures are not included in the standard mentioned.

The device used is limited to a lowest ignition energy of 4 mJ. Thus, the MIE of pure gases could not be as tested directly, as their values are all below that energy. The minimum ignition energy and minimum ignition temperature of dust‐air‐mixtures are important technical safety indices.

They are used for the assessment of the efficacy of the ignition sources expected in dust‐air mixtures. Hybrid mixtures of a combustible dust and flammable gas are usually found in many industrial processes that handles combustible dust, vapour or gas.

determination of explosion characteristics of dust clouds - part 2: determination of the maximum rate of explosion pressure rise (dp/dt)[max] of dust clouds: din en potentially explosive atmospheres - explosion prevention and protection - determination of minimum ignition energy of dust/air mixtures: din en Ignition of dust clouds and dust layers by hot surfaces is discussed in Chapter 5.

Although it is known that the minimum ignition temperature of a given dust cloud is not a true inherent constant of the cloud, results from the laboratory-scale tests illustrated in Fig. are regarded as representative of the dust tested. It is customary to. Flammability of Dust Clouds The ignition and propagation of flame in a dust cloud depend on a number of factors such as dust concentration, the composition of the dust and moisture content, particle size and shape, and turbulence in the system.

These factors not only determine the severity of the explosion but also influence the type and degree of precautions which it may be necessary and. IGNITION AND COMBUSTION OF DUST CLOUDS IN HOT ENVIRONMENTS - AN EXPLORATORY STUDY* Minimum Spark Ignition Energy The sensitivity of a dust cloud to ignition by electric discharges is defined produce when heated can be considered analogous to a hybrid mixture for which.

E Standard Test Method for minimum Ignition Energy of a Dust Could in air, Annual Book of ASTM Standards (pp. ignition energy (MIE) of dust clouds is in the range of 1. The earliest documented hybrid dust-gas explosion study was recorded inwhen Engler ignited mixtures of methane and dusts (soot and charcoal dust), obtaining explosions of these hybrid.Corpus ID: Standard Test Method for Minimum Ignition Energy of a Dust Cloud in Air 1 @inproceedings{StandardTM, title={Standard Test Method for Minimum Ignition Energy of a Dust Cloud in Air 1}, author={} }.pharmaceutical industries, or grain elevators.

Hybrid mixtures explosions involving dust and gas can cause great loss of lives and properties. The lower flammability limit (LFL) is a critical parameter when conducting a hazard assessment or developing mitigation methods for processes involving hybrid mixtures. Unlike unitary dust or gas explosions.