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Cleaning of Rotary Kilns

Cleaning of Rotary Kilns

NetterVibration offers an innovative and cost-saving solution for freeing residues off rotary kilns. Where staff is assigned to arduously knocking off residues in kilns from the outside with a hammer, the Netter High Frequency Impactor (NHK) cleans efficiently and gently. High frequent knocks loosen widespread stubborn residues with low stroke energy. This way, operators of rotary kilns can protect their plants and save on personnel costs.

 

High-Frequency Impactor Series NHK on Rotary Kiln
High-Frequency Impactor Series NHK on Rotary Kiln

Oerlikon Schweißtechnik is the leading company in welding and cutting technology. The company, which belongs to the Air Liquide Welding group based in Eisenberg in Rhineland-Palatinate, offers industrial customers processes, solutions and service in the field of welding and cutting technology.

One of Oerlikon’s products is a powder that is used for submerged arc welding. The raw material must be baked before it reaches its final coarse-grained form.

It is therefore conveyed into a rotary kiln which withdraws the moisture by heating it and allows it to become hard. During the baking process residues stick to the inner wall of the rotary kiln. They solidify and turn into a stubborn residue, which is difficult to remove. If this is not cleaned it burns and the mass becomes unusable. To avoid this the oven must be knocked from the outside.

Submerged arc welding

Under submerged arc welding (also referred to as SAW) a mechanised high-performance method of arc welding with high thermal efficiency is understood. When welding the slag formed by the powder covers the weld pool and the arc. The slag results from the heat melting the mineral powder. The benefit of SAW lies in the fact that long welds can be made seamlessly in a short time. SAW is useful wherever large single pieces need to be welded.

Oerlikon assigned an employee to hit against the rotary kiln so that the bulk loosened from the oven. This did not prove to be efficient and damaged the outside of the oven. When visiting the firm Nicolaus Efferoth, application engineer at NetterVibration, process caught his eye. He recommended to the technical manager Ulrich Gschwind that he install a Netter High Frequency Impactor of the series NHK which would loosen residues efficiently and gently.

High-Frequency Impactor Series NHK on Rotary Kiln
High-Frequency Impactor Series NHK on Rotary Kiln

Equipped with an electronic timer of the series AP 116 the NHK knock on two rotary kilns at Oerlikon. Ulrich Gschwind is satisfied: “I think it’s great that after 2 years NetterVibration’s solution still works just as perfectly as on the first day.” The AP 116 is programmed in such a way that it activates the high frequency impactors every twenty minutes for a few seconds. The NHK’s short impact interval is enough to free the oven completely of residues.