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

作者：Badur Janusz; Ziolkowski Pawel^*; Slawinski Daniel; Kornet Sebastian

来源：Energy, 2015, 92: 142-152.

DOI：10.1016/j.energy.2015.04.061

• Boilers
• Thermal stresses
• Thermal creep
• Damage
• Thermal fatigue
• CFD

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.

• 出版日期2015-12-1