![]() ![]() This seal consists of a series of overlapping spring plates. The single leaf seal offers a bit more sealing power, with a relative leakage of = 1.0. With this seal, flexible wrap can also be added between the seal plate and rotating shell, in order to improve the seal. This seal provides a torturous path for the ambient air by means of close clearance between the rotating seal ring and the stationary housing. The labyrinth seal is a cost-effective option with a relative leakage of > 1.0. When air leakage is not a major concern, such as with agglomeration or granulation drums, the labyrinth seal is a common choice. FEECO offers three primary seal types for our rotary equipment, with selection and customization based on factors such as the needs of the material being processed, emission gases, internal gases, and more.ģD Model of a Labyrinth Seal for Rotary DrumsģD Model of a Labyrinth Seal The Labyrinth Seal Seals are available in a variety of designs. In either case, seals are used to prevent the exchange between the internal and external kiln environment, allowing the processing to occur efficiently and as intended. Similarly, many kilns may require a specifically designed atmosphere within the kiln, such as an inert (low- or no-oxygen) atmosphere. However, air can leak in as a result of this negative pressure, potentially causing the temperature to drop. Again, this could result in lost or inferior product, or the need to reprocess the material.īecause of the high temperatures they employ, most rotary kilns are run at a negative pressure in order to prevent the heat and combustion gases from leaking out. ![]() Air leaking into the system has the potential to change processing conditions, therefore disrupting (or not allowing) the intended reaction. Rotary kilns use this controlled environment to cause a chemical reaction or phase change within the material being processed. Seals are especially crucial when working with rotary kilns, where high temperatures are employed and the atmosphere inside the kiln must be tightly controlled. This often results in increased fuel consumption and residence times, inferior product, or even a reduction in throughput. ![]() Seals are used to stop air leakage into the rotary drum, which can cause the internal temperature to deviate and the process to decrease in efficiency, sometimes significantly. This is less of a concern when working with agglomeration and granulation drums (these drums typically use a very simple seal called the Labyrinth seal), and more of a concern when working with drums that utilize heat transfer and a controlled processing environment. Seals help to ensure that the rotary drum and overall process perform as intended. ![]() Seals bridge the gap between the rotating drum and the stationary housing to provide a sealed processing environment within the drum while still allowing the drum to rotate smoothly. Rotary Drum Seals: A Necessity for Efficiency One factor that can have a significant impact on the overall performance of the unit is the rotary drum seal. The efficiency of a rotary drum, no matter what its purpose, is often key to maintaining a steady workflow and upholding quality standards. From fertilizer and chemical production, to ore beneficiation and even consumer products, rotary drums provide a reliable, high-capacity setting for accomplishing a number of necessary objectives when it comes to processing bulk solids. Rotary drums, including dryers, coolers, and kilns, are an integral part of the many industrial processes that shape our world. ![]()
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