High-Temperature Corrosion Chemistry in Oxy-Fuel Combustion

摘要: Drastic cuts in global CO2 emissions are needed to mitigate the warming if limiting 2oC. The power generation sector is largely based on fossil fuels and produces a significant share of emissions. Thus, new processes with drastically reduced need be employed warming. Two alternatives which may part solution replacement coal biomass or apply concept carbon capture storage (CCS). In CCS captured processed site thereafter transported location. Oxy-fuel combustion, has been studied this thesis, demonstrated large-scale pilot plants (30-60 MW). This work investigates possibilities co-combust oxy-fuel combustion for capture. Biomass combined potential contribute negative However, high temperature corrosion (HTC) related K-Cl-S chemistry detail order determine consequences heat transfer surfaces. This, since use problematic due relative content alkali (mainly potassium) chlorine. Together these compounds form KCl, salt causes corrosive deposits subsequent problems so called (HTC). When sulphur present, sulphates instead chlorides. Sulphates have higher melting point less therefore preferred chlorides. The thesis experiments performed 100 kW unit modelling chemical kinetics. Both experimental results show that SOX concentration preferable achieve as degree sulphation typically flue gas recycling, enables almost complete potassium some oxy-combustion atmospheres. makes an attractive process co-combustion biomass, chloride formation large extent suppressed. addition, effect KCl CO oxidation air-fuel environments. can promote CO-oxidation rich environment. no change could observed total burnout time even though was decreased.