The presence of CaS in the combustion chamber of a 12 MW circulating fluidized bed boiler
TL;DRAbstract
The presence of CaS in bed ashes from a circulating fluidized bed boiler (CFBB) has been studied. The boiler was operated with an excess air ratio of 1.2 but with varying air staging and at temperatures of 850&#xB0;C and 930&#xB0;C. The fraction of sulphide sulphur to total sulphur varied between 1 and 4%, with the higher sulphide contents found during intensified staging, that is, when the fraction of air supplied to the bottom bed was low. Under conditions with high SO<sub>2</sub> concentrations, due to stopped limestone addition, sulphide to total sulphur fractions of up to 16% were found. In conclusion, a high SO<sub>2</sub> concentration, especially in conjunction with intensified air staging, constitutes a risk factor for CaS formation.
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The presence of CaS in bed ashes from a circulating fluidized bed boiler (CFBB) has been studied. The boiler was operated with an excess air ratio of 1.2 but with varying air staging and at temperatures of 850&#xB0;C and 930&#xB0;C. The fraction of sulphide sulphur to total sulphur varied between 1 and 4%, with the higher sulphide contents found during intensified staging, that is, when the fraction of air supplied to the bottom bed was low. Under conditions with high SO<sub>2</sub> concentrations, due to stopped limestone addition, sulphide to total sulphur fractions of up to 16% were found. In conclusion, a high SO<sub>2</sub> concentration, especially in conjunction with intensified air staging, constitutes a risk factor for CaS formation.
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