An Assessment of Mechanism for Oxidation Corrosion of Alloy T91 Tubes in Supercritical Boilers

Abstract:

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The paper addresses the assessment of the high-temperature oxidation behavior of T91 in supercritical boilers. The trend to higher steam temperatures and longer periods of full-load operation greatly increases the oxidation corrosion on the steam-side surface. The oxide films can lead to major failures and consequently to reduced plant availability. The exfoliation of the oxide scale may block the tubes somewhere in the system with the potential for causing tube explosion. The oxide scale of T91 was sampled and analyzed by the energy dispersive X-ray spectrometry (EDXS) and the X-ray diffractmeter (XRD). The mechanism of oxidation corrosion and scale exfoliation, as well as its influence factor, were described. The measures were brought forward so as to provide a scientific guidance for dealing with oxidation corrosion and oxide exfoliation on a large scale in T91 in the supercritical boiler.

Info:

Periodical:

Advanced Materials Research (Volumes 239-242)

Edited by:

Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He

Pages:

3171-3175

DOI:

10.4028/www.scientific.net/AMR.239-242.3171

Citation:

D. P. Liu et al., "An Assessment of Mechanism for Oxidation Corrosion of Alloy T91 Tubes in Supercritical Boilers", Advanced Materials Research, Vols. 239-242, pp. 3171-3175, 2011

Online since:

May 2011

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Price:

$35.00

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