Download Dust Explosions: Course, Prevention, Protection by Wolfgang Bartknecht PDF

By Wolfgang Bartknecht

The writer summarizes todays wisdom of the reason and results of dirt explosions which have been the focus of his specialist existence. The presence of explosible dust/air combinations doesn't typically signify a danger of an explosion even if all natural and metal dusts are explosible. the writer develops test-methods for explosion risks linked to airborne dirt and dust and positive how you can hinder airborne dirt and dust explosions. The booklet is written for sensible use. The reader learns to realize the probability of a mud explosion and the effectiveness of protection measures. The e-book is richly illustrated and demonstrates the right kind use of the empirical theories.

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Sample text

In the following paragraph some selected test methods will be described, along with the resulting safety characteristics, plus the influencing parameters which are significant for practical applications. A distinction will be made between "dust layers" and "airborne dust". 2 Material Safety Specifications of Dust Layers (G. 1 Flammability Dust layers are considered to be flammable if they can be ignited with an outside source and if the fire propagates to a certain extent once the source is removed.

J o ~ ..... 140 / 130 :::J e QJ D. 5:j ..... 120 110 100 90 o ~ 10 ~ 20 30 --- time [h 1 / V ~ 40 50 60 Fig. 44. 6 Exothermic Decomposition 45 Whether a dangerous self-heating occurs under actual conditions depends upon the ratio of heat generation to heat transmission. As long as the capacity for heat removal is greater than that for heat generation at working conditions (storage condition) there will be no danger. Once an equilibrium is reached, the temperature will drop after a certain time.

Various ignition sources are used in preliminary tests to determine the general behavior of dust layers with respect to flammability and combustibility. The sources are: mechanically produced sparks (lighter with flintstone), glowing cigarette, burning match, and gas flame. They often have played an important role in actual mishaps (Fig. 28) [27]. g. , at lOOOe) , because dusts behave differently at various temperatures (see sect. 2). Fig. 28. 2 Burning Behavior Not only is a combustible dust's behavior towards various ignition sources important, but also the appearance of the fire and how fast it propagates after ignition.

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