An approach for estimation of water wall degradation within pulverized-coal boilers

Janusz Badur, Paweł Ziółkowski, Daniel Sławiński and Sebastian Kornet

Energy, 2015, vol. 92, issue P1, 142-152

Abstract: The main aim of this paper is to estimate the lifetime of water walls of pulverized-coal boilers at nominal conditions as well as after degradation of water tubes. An approach for a pulverized-coal chamber degradation process has been formulated based on operational and experimental data. This model was formulated using on-line state monitoring of a pulverized coal burner with aim of preventing the fireplace screens from high degradation and reducing large amounts of coal in the ashes. The rate of metal loss in the pipe wall from the fireplace was defined by a closure comprising of two parts. The first part describes degradation induced by impact of un-burned carbon, and the second part describes degradation caused by stress corrosion. In this paper, high-temperature creep in the pipe of the evaporator working in the powder-fired boiler is modelled and calculated. It has been shown that the lifetime of the element under consideration is essentially shortened by the influence of oxide growth on the steam side, an increase in metal temperature and erosion–corrosion wear on the flue gas side.

Keywords: Boilers; Thermal stresses; Thermal creep; Damage; Thermal fatigue; CFD (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544215005162
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:92:y:2015:i:p1:p:142-152

DOI: 10.1016/j.energy.2015.04.061

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().