Laboratory corrosion tests for simulating fireside wastage of superheater materials in waste incinerators

Statistical Lifetime Modeling of Fe-Ni-Cr Alloys Subject to High-Temperature Corrosion in Waste-to-Energy Production Units

“…Statistically speaking, the input data are the explanatory variables of the corrosion rate that is the dependent variable of the model. About 30 studies were included in the database, 1,2,7, with 1328 tests performed under different conditions, each of them expressing corrosion degradation in different ways such as: mean and maximum (1) International Organization for Standardization (ISO), 1 ch. de la Voie-Creuse, CP 56 CH-1211 Geneva 20, Switzerland.…”

“…de la Voie-Creuse, CP 56 CH-1211 Geneva 20, Switzerland. (1) 17248:2013(E) 12 on high temperature corrosion testing of metallic materials by embedding material in salts or ash should help in the future to build up this kind of model. Therefore, there is no lifetime model currently available in the open literature for commercial materials that takes all variables involved in the high temperature corrosion process into account.…”

“…Once the maximum thickness loss rate (MTLr) was chosen as the dependent variable, 684 values distributed in 15 studies [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] were analyzed by statistical descriptive methods such as curves as a function of time (Figure 3), histograms and box plots, in order to identify the data distribution, to exclude isolated data and to establish the validity domain.…”

“…The deposits contain alkali metals (Na, K) and heavy metals (Zn, Pb), which can form low melting point compounds at operating tube metal temperatures. 1 Corrosion initiates at temperatures where salts start to melt, and becomes severe when the quantity of fused-salt constituents in the deposits increases. Corrosion abatement occurs when the majority of the deposits become fused, since this might hamper the gas transport from flue gas to metal substrate.…”

“…2 This corrosion can be viewed as a form of high temperature corrosion caused predominantly by low melting point fused salts in slag deposits. 1 It has been demonstrated that this phenomenon is complex and the risk of corrosion leads to frequent shutdowns for repairs. In order to limit the degradation impact of high temperature corrosion on operating costs and availability of the installations, it has become necessary to understand the mechanisms, to identify key parameters that govern them, to optimize the materials selection for the operational units as well as to adopt a preventive maintenance strategy through prediction methodologies.…”