SAFETY IN THE PLANT Fig. 2: REMBE CO.Pilot
prevention is being eff ectively practiced. However, if this is not possible at all times and in all operating states, explosion hazards will still be present. In that case, it is necessary to divide any potentially explosive atmospheres into zones and systematically apply safety measures. Drying processes in particular are
used in many industries to produce material, for easier storage, more eff icient transport and a longer shelf life. However, the combination of moisture extraction and high temperatures creates an increased risk of both fi re and explosions. If fi res and/or explosions occur in
drying plants, which are usually very large, the situation is not only extremely dangerous for the machines and the business, but the employees on site too. Operators of spray dryers must
If any one of the aforementioned prerequisites is eliminated, explosion
combat a particular type of ignition source – namely smouldering nests that can lead to spontaneous combustion if the material undergoes excessive caking. Caking occurs owing to sub-optimal drying of the material and its initially high moisture
content. The caked material is then insulated against the surrounding air by a build-up of moist material. The high temperatures ensure that the caked material is continuously heated until a biological reaction takes place involving protein, carbohydrates and water – known as the Maillard reaction. The Maillard reaction generates additional heat that cannot be dissipated owing to the insulating layer of caked material. This exothermic process continues to accelerate until spontaneous combustion fi nally occurs. Caking of this kind can build up
both on the nozzles and the inner wall of the spray dryers. If the nozzle malfunctions, droplets may drip into the fl uid bed and cause further clumping. If a smouldering nest is able to form, this can ignite the explosive atmosphere inside the dryer or the downstream machinery.
For more information visit:
www.rembe.de
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Intelligent inspection system for leakage detection in valves in hazardous areas and industrial environments.
VALVE INSPECTION
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