The guideline VDI Part 9 describes a procedure for the determination of the dustiness of combustible dusts by practical simulation of dust formation. 12 Jun New basic interpretations, however, in accordance with the VDI Data Sheet 7 guideline, “Dust Fires and Dust Explosions for spray dryers. VDI [New]. Title (german) Staubbrände und Staubexplosionen – Gefahren – Beurteilung – Schutzmaßnahmen. Product imageVDI Items with .
|Published (Last):||15 December 2010|
|PDF File Size:||1.88 Mb|
|ePub File Size:||19.18 Mb|
|Price:||Free* [*Free Regsitration Required]|
The NFPA approach for protection of spray dryers, from the prospective of explosion safety experts, is much too conservative and leads to an over-engineered result bdi. Appropriate Protection for the Spray Dryer Process The NFPA approach Per NFPA 68, the conventional approach to protecting a spray dryer would be to apply so called explosion relief devices that offer a certain venting area taking into account the entire chamber volume, the strength of the vessel and the so called K St -value pressure rise normalized to a 1 m 3 — chamberalthough the process conditions inside a spray dryer are quite different from the vessels that the NFPA 68 committee had in mind when publishing the standard.
Since most vdi 2263 dryer installations are indoors, indoor flameless venting would then be the solution to consider. Furthermore, the volume gdi into account would only be the cone volume— the alignment of the maximum explosions vdi 2263 to the process vdi 2263 is the final step of this engineered approach. Vdi 2263 indoor venting systems, installation is uncomplicated and cost-intensive venting ducts are eliminated.
A vdi 2263 explosion vdi 2263 system must be safe and economically reasonable.
vdi 2263 D, Dust Explosion Hazard Assessment, presentation: The liquids slurries are atomized in a drying tower by means of pressure nozzles or rotating discs. The specially developed filter ensures that no burnt or unburnt dust particles are discharged. For this reason, it is necessary to equip the vddi drying process vdi 2263 appropriate protective measures. Any airborne organic dust that can burn could lead to an explosive atmosphere.
For more information see http: These interpretations will be discussed as an alternative cost-effective method of protecting spray dryer vdi 2263 as they specify the partial volume approach for the sizing of explosion relief devices described in NFPA 68 vdi 2263 FM Global Loss Prevention Data Sheet Therefore, plant process hazard analyses and dust testing should be vdi 2263 integral part of the total safety concept per NFPA standards, OSHA requirements, and as a practical matter 3!
Whatever the approach, spray dryer processes must be evaluated for their combustible dust risk and protected accordingly. Procedure-optimized installation within the immediate vicinity of people and machines is also an advantage, as is visual inspection without high-priced maintenance costs.
VDI-Standard: VDI 2263
The powdery commodity is dried vdi 2263 hot current or vd gas. These same readers should know that NFPA always gives a performance-based design option as an alternative, which simply means that other approaches are also allowed.
The risk of combustible dust explosions is often underestimated: Realistically evaluating risks is another approach that may result in less equipment or less costly equipment being used. Thus this method should be discussed in detail with Authorities Having Jurisdiction AHJ dvi the interest of vdi 2263 compliance leading to increased safety in addressing the combustible dust vdi 2263. Much 2236 been written and will continue to be written about the risks of combustible dust in a vdi 2263 facility, if for no other reason, than because people are injured and die every year from combustible dust-related explosions 1.
The costs for startup, fines, compensation vdi 2263 the 2236, etc. Unfortunately, these conditions are present in other elements of typical spray drying installations cyclones, bag filters, fluid bed driers, screens as well — so wherever the explosion starts it could propagate to all interconnected vessels.
VDI Archives –
Per Vri 68, the conventional approach to protecting a spray dryer would be to apply so called explosion relief devices that offer vdi 2263 certain venting area taking into account the entire chamber volume, the strength of the vessel and the so called K St vdi 2263 pressure vdi 2263 normalized to a 1 m 3 — chamberalthough the process conditions vdi 2263 a spray dryer are quite different from the vessels that the NFPA 68 committee had in mind when publishing the standard.
The K St value is significantly 2263 by the dust concentration 9. When stored at home in small amounts or even in big bags at warehouses, milk powder is considered a harmless product — as long as fine dust particles are not airborne, dispersed and in contact with a source of ignition such as a mechanically created spark, a spark created by discharging static electricity, a hot surface, or an open fire. Combustible Dust 6 Any airborne organic dust that can burn could lead to an explosive atmosphere.
VDI-Standard: VDI 2263 Blatt 9
Spray-dryers are primarily deployed in the chemical and food industry, for processes such as vdi 2263 milk, detergent powder or infant formula production.
Incidence numbers vary and the near misses are not accounted for. After an event, vdi 2263 clean and replace the bursting disc and the flameless vent is immediately ready for operation once again.
For example, we use powdered milk in food we eat and handle such powder in our kitchens, living rooms, coffee vdi 2263 and even airplanes. Additionally, the pressure rise and increased vdi 2263 level associated with free vented explosions are massively reduced to negligible, harmless levels.
Anyhow, this innovative calculation method allows for effective explosion protection with venting vdi 2263 an affordable, competitive price.
One process that has received limited attention with respect to protection against combustible dust risks to date is the spray drying vdi 2263.
If there is a combination of vdi 2263 dusts with a sufficient ignition source, explosions can occur. The following example of a m 3 spray drier where the required vri area following NFPA 68 would be 6. Only in this way can the level of protection, and thus occupational safety, be ensured.
The risks are great as are the potential costs for protection following conventional design standards. All of these features add up to additional savings. For more information on Combustible dust, see, Mayer, Gerd, Ph.
This transfer fully extinguishes the flames. Since the concentrations in spray dryers are much lower maximum: