The ettringite sulphur uptake ability is related to the lime made available by its thermal decomposition. An ettringite-rich industrial FBC reactivated ash, obtained by hydration at 70°C for 48 h, has proved to be a satisfactory SO2 sorbent when submitted to a laboratory scale evaluation test. The desulphurizing behaviour of ettringite contained in the sorbent was better than that of a synthetically prepared ettringite previously investigated. At the end of the sulphation test, the degree of calcium conversion was 92% for the sorbent, 58% for the synthetic ettringite. However, the sulphur uptake efficiency for the latter was higher inasmuch as phases not useful for SO2 uptake were also present in the sorbent. As far as the attrition/fragmentation propensity is concerned, the sorbent investigated has shown a relatively high fines elutriation rate, whose negative effect can be counterbalanced by the enhanced kinetics of the attrited material.
The role of ettringite in the re-use of hydrated fly ash from fluidized bed combustion as sulphur sorbent / G., Bernardo; Montagnaro, Fabio; Salatino, Piero; A., Telesca; G. L., Valenti. - ELETTRONICO. - (2004), pp. 82-1-82-6. (Intervento presentato al convegno 27th Meeting of the Italian Section of The Combustion Institute (Jointly with the Greek Section) tenutosi a Corfu, Greece nel 17-19 Giugno).
The role of ettringite in the re-use of hydrated fly ash from fluidized bed combustion as sulphur sorbent
MONTAGNARO, FABIO;SALATINO, PIERO;
2004
Abstract
The ettringite sulphur uptake ability is related to the lime made available by its thermal decomposition. An ettringite-rich industrial FBC reactivated ash, obtained by hydration at 70°C for 48 h, has proved to be a satisfactory SO2 sorbent when submitted to a laboratory scale evaluation test. The desulphurizing behaviour of ettringite contained in the sorbent was better than that of a synthetically prepared ettringite previously investigated. At the end of the sulphation test, the degree of calcium conversion was 92% for the sorbent, 58% for the synthetic ettringite. However, the sulphur uptake efficiency for the latter was higher inasmuch as phases not useful for SO2 uptake were also present in the sorbent. As far as the attrition/fragmentation propensity is concerned, the sorbent investigated has shown a relatively high fines elutriation rate, whose negative effect can be counterbalanced by the enhanced kinetics of the attrited material.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
