Effect of Blast Furnace Sludge on SO2 Emissions from Coal Combustion

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• 作者：Zhifang Gao ; Zhaojin Wu ; Mingdong Zheng
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：April 21, 2016
• 年：2016
• 卷：30
• 期：4
• 页码：3320-3330
• 全文大小：746K
• 年卷期：0
• ISSN：1520-5029

文摘

Blast furnace sludge (BFS) exhibits a strong sulfur-fixing ability due to the large amount of metal oxides, such as Fe₂O₃, CaO, SiO₂, and Al₂O, that it contains. In this study, the influence of BFS on SO₂ emissions and the sulfur-fixing mechanism is studied in the coal combustion process. The results show that the SO₂ emission peak values decrease with the increase of BFS mass percentage and that the sulfur-fixing ratio increases to 89% when the BFS mass percentage reaches 10% at 900 °C. The sulfur-fixing mechanism predicts that the multicomponents of BFS favor the formation of a stable sulfate (3CAO₃·A1₂O₃·CaSO₄) and reduce the rapid decomposition of CaSO₄ coated by thermally stable sulfur compounds such as CaFe₃(SiO₄)₂OH. These results indicate that BFS, as a sulfur-fixing agent, is cheap and highly efficient in controlling SO₂ emissions during coal combustion processes.