Sicherheitstechnik

1
Planning and execution of a test series for the
representation of reactions fast running off up
to the explosion.
Dust Explosions
English
2
Contents
Whatever burns can also explode
The factors causing a dust explosion
Newscast Explosion in a corn mill
Minimum amount of energy needed to ignite
flammable gases, vapours and dust
Experiment procedure for a dust explosion
Carrying out a dust explosion
Film demonstrating a dust explosion
English
End
3
Whatever Burns can also Explode!
It is quite normal that flour can explode.
The rule is
A finely ground substance can always explode.
An explosion comprises rapid combustion. This is
due to the enlarged surface area.
English
4
The Factors Causing a Dust Explosion!
In order for an explosion to take place three
factors are necessary
Dust
Oxygen
Source of ignition
The sources of ignition that can cause an
explosion are dependent on the type of dust.
A spark caused by pulling out a plug from a
socket is enough to cause ignition. If metal hits
metal then the energy of the spark is not enough
to start a flour explosion.  
English
5
Newscast Explosion in a corn mill
back
6
Minimum ignition energy need to ignite flammable
gases, vapours and dusts
English
7
Experiment procedure for a dust explosion
1.Base plate with silo and lid
2.Candle with candle holder
3.Blowtube with a tube and air pump
4. Porcelain crucible
Procedure
The appliance is assembled as shown in the
diagram above. The dusts that are needed for the
experiment should be dried before the experiment.
The porcelain crucible is filled with 1 teaspoon
of dust (maximum half full) and is placed under
the blowtube in the silo. The silo is now closed.
The air pump should be activated quickly so that
dust swirls around and is then ignited.
English
8
Carrying out a Dust Explosion
English
back
9
Film demonstrating a dust explosion