Download - SMART Explosion Venting
13.04.23Page 1
ExplosionsschutzExplosion Protection
Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 2
SMART Explosion VENTING
-Dr.-Ing. Johannes Lottermann -
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 3
What is explosion venting?
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 4
What is explosion venting?
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What is explosion venting?
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 6
Which basic rules do exist?
Rulebooks
ATEX – 94/9/EG (prevent ignition transmission & keep mechanical resistance)
NFPA 68, 664, 69, 654, 61 (application hints)
EN 14491 – Explosion Venting
EN 16009 – Flameless Explosion Venting devices
EN 14797 – Flame arrestors
VDI 2263 – Dust fires and dust explosions
VDI 3673 – Pressure venting of dust explosions
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 7
What kind of venting devices do exist?
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 8
What needs to be tested using the example of ATEX?
Venting devices
Acc. to EN 14797:
static set pressure (tolerance within 25%)
mechanical integrity (no missile effect)
venting effiency (in comparison towards a inertia-less foil)
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 9
Where does venting have to be applied?
Dust collectors, bag houses Silos and bunkers Mixers Blenders Cutting machines Granulators Elevators and chain conveyors Dryer Sieves and sifters … … …
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 10
What does the required vent area influence?
strength of the vessel (pred)
volume of the vessel (V)
type of dust / gas (pmax, KSt bzw. KG)
set pressure of the venting device (pstat)
venting effiencency (Ef = Aeffective/Ageometric)
dimensions of the vessel (L/D-ratio)
(process conditions)
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 11
How is the vent area calculated?
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 12
SMART = FLAMELESS Venting (also for metal dusts !!!)
Stainless steel riveted design allows to absorb pressure shock
Reusable flame arrester made of a special stainless steel mesh filter
Stainless steel dust filter with specially developed pressure absorbing coils
Integraded REMBE rupture disc with signal unit and gasket
Monitoring unit in cabled IP-65 housing
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 13
SMART = SANITARY Venting
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SMART = SANITARY Venting
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SMART = TARGETED Venting
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SMART = TARGETED Venting
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SMART = CUSTOMIZED Venting
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SMART = ENGINEERED Venting
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SMART = ENGINEERED Venting
Conventional approach for sizing the vent area of spray driers
Volume Full Volume
KSt-Value
acc. to 20l-sphere values
pmax
acc. to 20l-sphere values
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 20
SMART = ENGINEERED Venting
BUT….
Volume Why is the entire volume taken into account although the upper part is nearly full with wet
powder?
KSt-Value
Why is the „worst case“ pressure rise considered, although the concentrations in the tower
are so much lower than in the 20l-sphere?
pmax
Why is the the maximum pressure considered at roomtemperature, although high
temperatures are reducing the maximum pressure?
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 21
SMART = ENGINEERED Venting
VZ = 127m²
VK = 72m²
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Johannes Lottermann – Explosion Protection Department13.04.23 SMART Explosion VENTINGPage: 22
SMART = ENGINEERED Venting
VZ = 127m²
VK = 72m²
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Vielen Dank für Ihre Aufmerksamkeit!
Many thanks for your attention!