REACTIVITY OF OIL SHALE ASHES TOWARDS SULFUR DIOXIDE
2. LOW-TEMPERATURE ASHES FORMED BY USING CFBC TECHNOLOGY
R. KUUSIK
T. KALJUVEE
A. TRIKKEL
Department of Basic and Applied Chemistry,
Tallinn Technical University
H. ARRO
Department of Thermal Engineering,
Tallinn Technical University
5 Ehitajate tee, Tallinn
19086 Estonia
| Samples of different ashes formed during combustion of Estonian oil shale in
a circulated fluidised bed (CFB) facility (in Hans Ahlström Laboratory, Karhula) were analysed by different
methods. Binding activity of these ashes towards SO2 and the influence of temperature and the previous grinding of
samples on the binding activity were studied with thermogravimetric equipment. The absence of sulfide sulfur in
these ashes and their high SO2 binding capacity were established. At 800 °C and after 10-minute contact, up
to 37 mg of SO2 per 100 mg of sample was bound. Previous grinding of the ashes increased this value by
1.8 times, almost to the level of the SO2 binding ability of natural limestone. The SO2 binding ability of the ashes studied was approximately twice higher than that of cyclone ash formed by using the pulverized firing technology. |