Corrosion of Dry - Bottom Boiler Evaporator in Power Industry

Abstract:

This contribution solves the character of corrosive damage of the tubes, steam generating tubes of dry-bottom boiler combustion chamber in power plant engineering, and deals with the aspects related to the corrosion criteria of the carbon steel. The laboratory test results of samples applied on tubes that were subject to non-destructive and destructive tests are analyzed in one part of the work. The samples of greater incidence of corrosion products, which caused the failure of the integrity of the steam generating tubes, were tested. The work deals in details with the results of laboratory and chemical analysis of boiler water from the previous periods. The thesis evaluates the amount and frequency of P₂O₅ dosing cycles. The work also deals with the proposal of corrective measures that shall lead to the chemical balance of the boiler water. It proposes a continuous correlation methodology for chemical stabilization.

• Periodical: Materials Science Forum (Volume 818)
• Pages: 129-132
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.818.129
• Online since: May 2015
• Authors: Robert Maršál*, Jitka Podjuklová, René Siostrzonek, Daniela Pavelková, Lenka Koldová, Zdeněk Pěnička
• Keywords: Boiler, Chemical Regime, Corrosion, Evaporator, Power Plant Engineering, Steam Generating Tube

References

[1] A. Dobrozemský, EKOTERM, Project documentation for the repair of boiler K9 MITTAL STEEL a. s. 2005, 48 p.

[2] Report - crack detection inspection of the internal surface of the K9 boiler combustion chamber tubes, TEDIKO 2011/9. 22 p.

[3] Assessment of the chemical mode of heating plant in relation to corrosion and failure of boiling systems in AMEO s. r. o. NALCO, 2011/8. 13 p.

[4] Protocols, Metallurgical and chemical laboratories, laboratories of structural analysis ARCELOR MITTAL a. s. 2010-(2012).

[5] R. Maršál, A proposal for repair of welded joints of tubes made of material 12. 022. 1 after copper contamination, Diploma Thesis, VŠB-TU Ostrava, 2012, 55 p.

[6] P. Skýba, The structure of heat resisting steels. Brno 7, 2007, 34 p.

[7] P. Grobner, Material corrosion and protection, Corrosion of steel and cast-iron in gaseous environment under high temperature. Praha 7, 1964, Zeross, 224 p.

[8] B. Strnadel, Material Science II., Degradation processes and design of structural materials. Ostrava 2008, VŠB – TU Ostrava, FMMI, 276 p.