• 关键词：化学链燃烧  CaSO₄氧载体  Fe₂O₃氧载体  竞争还原反应

• 基金项目：国家自然科学基金项目(No.51306084,51276037,51174105)

• 黄梅
• 昆明理工大学复杂有色金属资源清洁利用国家重点实验室, 昆明 650093

• 李孔斋
• 昆明理工大学复杂有色金属资源清洁利用国家重点实验室, 昆明 650093

• 郑敏
• 昆明理工大学复杂有色金属资源清洁利用国家重点实验室, 昆明 650093

• 沈来宏
• 东南大学能源热转换及其过程测控教育部重点实验室, 南京 210096

• 摘要：采用CaSO₄和少量Fe₂O₃所组成的混合物作为化学链燃烧的复合氧载体,对水蒸汽气化介质条件下煤气化－复合氧载体还原反应展开热力学分析,探讨了双氧载体在燃料反应器中的竞争还原反应机理及铁氧化物与气体硫化物、与煤灰反应的可能性.铁基氧化物主要是起到载氧的作用,其加入有利于提高燃料燃烬度,且不会被过度还原成FeO或Fe.在850~1050 ℃反应温度范围,铁氧化物不会与SO₂和H₂S反应而转化成FeS或FeS₂.CaSO₄还原副反应生成的CaO容易与煤灰中SiO₂和Al₂O₃反应,生成钙的硅酸盐和铝酸盐.

• Abstract：Combination of CaSO₄ and Fe₂O₃ was used as composite oxygen carriers for chemical looping combustion (CLC) in the present work. Thermodynamic equilibrium analysis on the reactions between oxygen carriers and coal in the presence of stream was investigated. The competing reaction mechanisms of coal with CaSO₄ and Fe₂O₃ as well as the possible reactions between iron oxides, gas sulfides and coal ash were also discussed. The addition of Fe₂O₃ to CaSO₄ benefited the conversion of fuel to CO₂ while H₂O. Fe₂O₃ was only reduced to Fe₃O₄, rather than FeO or Fe. In the reaction temperature range of 850 to 1050 ℃, the reactions of iron oxides with SO₂ or H₂S to FeS or FeS₂ were not observed. It should be noted that CaO, as the by-product of CaSO₄ reduction, can react with the SiO₂ and Al₂O₃ in coal ash to form calcium silicate and calcium aluminate, respectively.

• Key words：chemical-looping combustion (CLC)  CaSO₄ oxygen carrier  Fe₂O₃ oxygen carrier  competing reduction

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