BOILERS PARTICLES POWER TUBE FAILURES ZINC

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Abstract

A 260-megawatt (MW) pulverized coal-fired drum boiler was having problems with large numbers of deposit-related water wall tube failures. These deposits were causing long-term over-heating damage and under-deposit corrosion failures of the boiler water wall tubes. Water wall panels from the fifth through the eighth floors on the north wall had been replaced twice in less than 10 years. The system has a mostly admiralty brass condenser and admiralty brass first feedwater heater in the neck of the turbine exhaust hood. All other feedwater heaters were converted to stainless steel over a 10-year period. The unit has no previsions for lay-up of the condenser, boiler feedwater heaters, or the boiler, other than draining hot and air drying.

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