The Influence of Cr₂O₃ on the Sulfur Capture Efficiency of CaO in Pulverized Coal Combustion Process

Abstract:

The effects of Ca-based sulfur catcher on sulfur fixing were investigated by experiments. The results indicate that sulfur capture efficiency of CaO is the maximum when n(CaO)/n(S) ratio is equal to 2.5. Moreover, the influences of Cr₂O₃ on sulfur-fixing of CaO were studied when n(CaO)/n(S) ratio is equal to 2.5. The results indicate that addition of Cr₂O₃ can improve the sulfur capture efficiency of CaO, and efficiency of CaO is the best when Cr₂O₃ is added to 0.5%. This is because that Cr₂O₃ can be oxidized to CrO₂. On the one hand, the oxides of chromium can catalyze the reaction of sulfur-fixing. On the other hand, CrO₂ can react with SO₂ to form Cr₂(SO₄)₃. These also can improve the sulfur capture efficiency of Ca-based sulfur catchers.

• Periodical: Advanced Materials Research (Volume 997)
• Pages: 332-336
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.997.332
• Online since: August 2014
• Authors: Sheng Qin Zhang*, Guang Jun Zhu, Neng Yun Deng, Yan Hong Gao
• Keywords: Calcium Oxide (CaO), Cr₂O₃, Pulverized Coal, Sulfur Fixing

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