Abstract
Clean coal briquette is one of the most effective techniques to remove SO2 from coal combustion by using sulfur-retention agent to retain sulfur in coal residuals. Ca(OH)2 has been proved to be an effective sulfur-retention agent. CaSO4 as the primary sulfur-containing product, however, is thermal unstable at high temperatures. It has been reported that SiO2, Al2O3, Fe2O3 etc. are excellent sulfur retention additives, those are abundant in coal fly ash. In this study coal fly ash was used to the additive to improve the sulfur retention of coal briquette. The results showed that the addition of coal fly ash can improve the sulfur retention. The modified coal fly ash obtained by calcinations assisted with Ca(OH)2 can improve the sulfur retention more noticeable. The SEM and XRD results further indicated that coal fly ash promoted the formation of the sulfur-containing products such as Ca-Si-S-O compounds with high thermally stability.
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