Failure analysis of the leakage at boiler bottom wall tube of steam power plant

In order to maintain the availability of electricity supply, a failure at power plant is mandatory be prevented. If damage has occurred, analysis root cause must prioritized resolve problem and prevent further damage. One important units in boiler that role as steam generator producing by changing water liquid vapor phase. The quality (feed) becomes one crucial factor determining lifetime boiler. Moreover, some factors related process variable control such velocity, temperature, pressure, flow rate fluid should follow specified design. Otherwise, can occur, resulting unit shutting down, thus stopping electric production.In this paper, mechanism leakages occurred bottom wall tubes was investigated. Quality several associated with characteristic are mainly considered suspect contributing Further this, macro-and microstructural observations leaked physical were done. Analysis chemical composition performed water. Other concerned also observed validate leakages.Chemical shows excess content hydrazine (N2H4) an inhibitor corrosion 100 times more than representing low-quality level which significantly influences aggressiveness addition intentional turbulence shown having Reynold number 33,000 together contaminated increases risk inner tube. Macro observation exhibits sectional reduction on upper curve radius indicating loss product reaction between outer tube surface suspicious during operation. protective magnetite layer particularly found around leakage denoting local happened On other hand, micro plastic deformation implying increase high temperature tubes.To conclude, resulted from collaboration originating ambient environment both sides tubes. Indeed, low quality, rate, increasing operation successfully caused erosion corrosion. While tube, fuel, led induce pitting case, corrosions responsible encourage failure.