Hydration of partially sulfated lime with water
Conference
·
OSTI ID:20006783
The reaction between water and partially sulfated lime particles was studied under isothermal conditions using a Calvet microcalorimeter. The rate and extent of hydration were followed as a function of time by monitoring the evolution of heat from the reaction chamber. Experiments were performed with spent sorbent particles from two industrial circulating fluidized bed combustors and with lime particles sulfated in the laboratory using a thermogravimetric analyzer. The effect of temperature (40--85 C), particle size (150--850 {micro}m) and extent of sulfation (CaSO{sub 4} conversions between 0--45%) on the rate of hydration was determined. The rate of hydration of the partially sulfated lime particles was found to be independent of particle size, to increase with increasing temperature and to decrease with increasing level of sulfation of the particles. The results of this study suggest that the rate of hydration of partially sulfated lime particles is controlled by the transport of water across the CaSO{sub 4} layer that surrounds the individual grains of CaO. The apparent activation energy for this process is of the order of 45 kJ/mol. A first order kinetic model is shown to correlate well the effect of time and temperature on the extent of hydration of spent sorbent particles from fluidized bed combustors.
- Research Organization:
- Univ. of New Brunswick, Fredericton, New Brunswick (CA)
- OSTI ID:
- 20006783
- Report Number(s):
- CONF-990534--
- Country of Publication:
- United States
- Language:
- English
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