The combustion of coal and municipal waste generates very corrosive media particularly near the superheater tubes. Sulphur and chlorine are known to be the main corrosive agents in coalfired plants and in waste incinerators respectively. This paper focuses on the study of the corrosivity of such environments composed of gases and ashes, at high temperature, on two commercial alloys with different chromium and nickel contents: the T91 and AC66 steels. Specific laboratory tests allowed to study the temperature effect and the influence of the ash and gas constituent contents (HCl-SO 2 -H 2 O-K 2 SO 4 -Na 2 SO 4 -KCl-NaCl). Experimental results showed a higher corrosivity of the waste incinerator conditions compared to the coal-fired plant ones. Moreover the AC66 steel has a better corrosion resistance than the T91 alloy. Numerous factors are implicated in the corrosion processes and can act in concert.
The behavior of three different materials with respect to their Fe, Cr, Ni contents
have been studied between 450°C and 700°C, in waste incinerators combustion conditions,
where it occurs a main influence of chlorine, sulfur and water vapor. This works analyzes the
behavior of these materials which depends on their capability to form melted compounds and
on the nature of these melted phases. Also as the corrosion mechanism is influenced by the
presence or missing of any corrosive species, the study focalizes on the specific influence of
SO2 and alkaline chorine. Effect of additive ashes on the corrosion behavior of tested
materials is also studied. The mechanism of corrosion in waste incinerators is supported by
thermodynamic calculations performed with the “Thermocalc” software.
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