Special Focus: Wear Protection
Fig. 2. Special Nano structure.
Industry proven boiler tube protection against corrosion and wear Castolin Eutectic was among one of the first companies to develop dense, thermally sprayed coatings to protect boiler tubes in power plants against wear and corrosion in the 1980s and have developed a considerable reputation and experience of these coatings. Success is based on a combination of alloy development and also a special coating deposition process (Spray and Fuse). A novel high Molybdenum, nickel, silicon alloy was developed and patented for severe corrosive/wear environments. Tis solution combined with the inherent
properties of such Spray and Fused coatings of metallurgical bonding, zero through porosity provided improved service performance over all other solutions on the market is increasing the use of this approach. Te increasing use of alternative fuels is extending the corrosion problems in waste to energy plants and leading to new developments. Trough development in the early 1990s with
Fig. 4. The CDP complete wearplate range.
leading power companies and high temperature wear institutes a family of iron-based high temperature alloys was developed to protect boiler tubes from high temperature erosion wear using the arc wire spray deposition process. Today these solid industrial references are being used for new alloy development, supported by improvements in application equipment to meet the increasing performance demands. At many coal/waste plants, boiler tube coating is an established route to extend tube life and progressive companies offer a range of protection alloys and processes tailored to the specific wear and corrosion demands of the plant.
Wear protection of transport tubing Te major wear areas outside the boiler are concerned with the crushing and transport of coal/fuel and ash removal.
A pneumatic ash transport from the boilers to the
ash cyclone caused the original elbow lifetime to be increased by a factor of three by using a new design and the use of CDP wearplate solution.
Conclusions Castolin Eutectic’s thermal power plant repair service package includes: a wide range of innovative products to solve wear problems; on-site and in our workshop refurbishment possibilities; increased service life over conventional welding alloys; fast and effective return to service; aIloy development and in-house manufacturing.When a power plant’s critical parts are too large to be moved for example, Castolin’s CastoLab Services maintenance experts will visit a customer’s premises to solve the problem on-site. l
Fig. 3. Dense coating on tube panel ready produced by spray and fuse process. Enter 49 or ✔ at
www.engineerlive.com/ipe Dr Gary Heath is with Castolin Eutectic, Lausanne, Switzerland.
www.castolin.com www.engineerlive.com 49
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