Special Focus: Wear Protection
are usually on pneumatic transport piping and elbow of coal/fuel and ash removal. Here, original elbow lifetime increased by a factor of 3 by using a new design and the CastoTube solution.
NanoAlloys Te world’s first NanoAlloy formulation was developed to provide outstanding abrasion and erosion resistance using an innovative nano structural engineering approach to alloy development based on a low cost ferrous base. Tis science was translated into a welding wire which could be used with normal welding equipment in the power plant but producing a protective overlay with a bulk hardness over 71HRC! Applications have been proven in the power industry in coal, ash and alternative fuel transport and grinding systems. Use in coal grinding systems have shown a five times improvement in wear life in key components.
Boiler tube protection Castolin Eutectic was amongst 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. Essentially two systems have evolved one against erosion wear in coal fired boilers and one for corrosion resistance in waste incineration boilers. In coal fired boilers, boiler tube wear occurs from erosion by hard particles (quartz) in the gas stream.
Te solution is to coat the tubes with a thin (0.7mm) but very hard (750-1000 HV) metal coating. Coating is by arc wire thermal spraying either on site in the boiler or in specialist coating workshops. Where corrosion is a serious issue, such as in municipal waste incineration boilers, the high chlorine levels and high temperatures combine to give extreme corrosion of boiler tubes and premature outages. Te solution requires a dense, highly corrosion resistant coating to be applied to the tubes, which has been achieved using a combination of patented, high molybdenum, nickel, silicon alloy in conjunction with a special coating deposition process (Spray and Fuse).
Fig. 2. Castolin Boiler Coating team with Arc Wire Spray machines for protecting boiler tubes.
Circle 65 or ✔ at
www.engineerlive.com/ipe
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68