Development of an active sorbent from fly ash for dry desulphurization of simulated flue gas in a fluidized-bed reactor

In this work, dry desulphurization of simulated flue gas was investigated in a batchwise operated laboratory-scale stainless steel fluidized-bed reactor (46 mm × 500 mm) by using an active sorbent composed of a mixture of fly ash, FGD-gypsum and calcium-containing local Turkish limestone (Mengen/Bolu) which was calcined at 900 °C with 5% H2O vapour. The sulphation reaction was carried out in a range of SO2 feedstock concentration (1000 ppm SO2 ≤ C ≤ 5000 ppm SO2) and at a temperature range of 300 °C ≤ T ≤ 500 °C. The experimental sulphation conversion data of active sorbent were compared with those of literature. Results obtained with the sorbent of this study indicated an increased sulphation conversion according to the conventional calcium-containing sorbent.