Reductive decomposition of spent CaSO4 was studied using a packed-bed reactor to regenerate an alternative CaO sorbent. The reactor was operated at various process conditions including an increasing CO concentration, CO/CO2 concentration ratio (0.067-1), and temperature (1123-1273 K). In all cases, N2 was used as a balancing gas. The regeneration of CaO from CASO4 was found to be most effective in the CO-CO 2-N2 atmosphere and strongly depended on the CO/ CO 2 concentration ratio. At 1273 K, an apparent conversion value of 0.91 for the decomposition of CASO4 to CaO was obtained in a 2 vol % CO and 30 vol % CO2 atmosphere. On the other hand, in a CO-N 2 atmosphere, CaS was predominantly produced. The SO2 absorption capacity of CaO regenerated from CASO4 was higher than that of limestone-calcined CaO. A larger pore diameter of the regenerated CaO was considered to be responsible for the higher SO2 absorptivity.
|Number of pages||7|
|Journal||Industrial and Engineering Chemistry Research|
|Publication status||Published - 26-11-2003|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering