The researchers experimented with a spray drying process to make flue gas desulfurization more efficient. They tested different factors like the number of nozzles and types of additives. They found that using two stages of nozzles was better than one, and adding NaOH improved efficiency. The best results were seen with a slurry mix of 60% from the primary nozzle and 40% from the secondary nozzle. The temperature and SO2 removal were most affected in the slurry atomization region. Overall, increasing the number of nozzles and using additives can greatly improve the efficiency of flue gas desulfurization.