EagleBurgmann international
EagleBurgmann WORLDWIDE
With around 250 locations and 90 serve centers, we are represented in the most important economic regions of the world. The advantages are clear: short paths to our customers, fast response times and a shared language.
Issue and challenge:
The steam generators of coal-fired power stations are fired by coal dust consisting of particles that are small enough to be transported by streams of air. It is made in tube ball mills by grinding and drying coal. The operators' coal-fired power station has 2 steam generators, each with a power of 600 MW. They are supplied with coal dust by 12 tube ball mills. The harsh operation and the high levels of dust generated by the grinding process in the grinding chamber place extreme stresses on the sealing system. It must be possible to mount the shaft seals easily without the need to dismantle the tube ball mill or its components. They are fitted to the inlet and outlet equipment between stationary and rotating components. Each mill needs 4 shaft seals: two serve as mill end seals for a shaft diameter of 1605 mm, while two serve as end bearing seals for a shaft diameter of 160 mm.
Solution from EagleBurgmann Espey:
Espey designed a combined Espey WD200/500 with barrier gas connection and 4 sealing rings for the mill end. It can be fitted easily, thanks to the split casing. The internal diameter of the seal is 1605 mm (63.19 “). The barrier air seal for the end bearing is provided by an Espey WD200 with 4 seal rings. Both seals are designed for a temperature of 110 °C (230 °F), a pressure of 1.08 bar (15.66 PSI) and a rotation speed of 15.8 rpm. Both seals achieve full prevention of the escape of dust to the atmosphere by supplying air as barrier gas. No additional supply systems are therefore needed. The Espey sealing system easily copes with axial and, in particular, with radial shaft movements such as are found in ball mills as a result of the high mechanical stresses, as well as trapping the high levels of dust.
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The Eagleburgmann Group
Sealing technology for plants and machines
EagleBurgmann is one of the worldwide leading providers of industrial sealing technology. Mechanical seals, seal supply systems, magnetic couplings, carbon floating ring seals, expansion joints, gaskets and packings as well as comprehensive services are used wherever reliability and safety are needed.
Mechanical seals and more
Sealing technology by EagleBurgmann is used worldwide in oil and gas industries, refineries, the petrochemical, chemical, and pharmaceutical industries, food processing, energy, water, mining, paper, aerospace, and other industries. Close to 5,800 employees provide their ideas, solutions, and commitment so that customers can rely on our sealing technology.
What makes us stand out is our excellent quality, great innovative capacity, and an extensive product portfolio for nearly all industrial processes and fields of application. Our product portfolio includes everything from mechanical seals and seal supply systems to magnetic couplings, carbon floating ring seals, expansion joints, and gaskets and packings as well as comprehensive services. Since we are part of the German Freudenberg and Japanese EKK group, we have all the necessary resources for a firmly based reliable partnership.