Abstract
The selection of fuel for a Combined Heat and Power (CHP) plant can vary over time. By choosing less expensive fuels, operation costs are reduced, however, cheaper fuels generally increase corrosion maintenance costs. The corrosiveness of different fuels has been studied extensively while how the current corrosion attack is influenced by corrosion history, i.e. previous deposit build-up and oxide scale formation, is less studied. This phenomenon may be referred to as a "corrosion memory" effect (Paz et al., 2017). The present work investigates the influence of addition of sulfur to the fuel on the corrosion memory through air-cooled probes in the Waste-to Energy lines at Måbjerg Energy Center (MEC) in Denmark. The results show a corrosion memory effect, i.e. as initially corrosive environment may increase the subsequent corrosion rate and vice versa.
Highlights
The selection of fuel has a great impact on the total budget of a Combined Heat and Power (CHP) plant
The corrosion memory effect was investigated with four different air-cooled probes: Two probes stayed in their respective line during the whole 2000 h duration of the exposure: ‘‘Ref” was only exposed in the reference line and ‘‘Recirculation deposit (Rec)” only in the Sulfur Recirculation line
After 2000 h the reduction of the chlorine is drastic between the Sulfur Recirculation line and the reference line with a 97% reduction of chlorine in the Sulfur Recirculation line
Summary
The selection of fuel has a great impact on the total budget of a CHP plant. By choosing less expensive fuels (like different fractions of biomass or waste) the profit of the plant can increase greatly. The technique aims to change the environment at the superheaters in order to limit the high-temperature corrosion This is primarily done by decreasing the presence of alkali chlorides. A successful way to minimize the corrosiveness of alkali chlorides is to sulfate them to corresponding alkali sulfates This can be done by using elemental sulfur, sulfur-rich additives or by co– combustion with a suitable fuel, e.g. sludge and coal (Henderson et al.; Karlsson et al, 2011; Krause, et al, 1975; Pettersson, et al, 2011; Vainio et al, 2013; Viklund et al, 2009).
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