Ca-Fe/bentonite载氧体煤化学链燃烧反应特性

贾伟华; 胡修德; 刘永卓; 杨明明; 郭庆杰

Ca-Fe/bentonite载氧体煤化学链燃烧反应特性

青岛科技大学化工学院清洁化工过程山东省高校重点实验室, 山东青岛 266042

基金项目: 国家自然科学基金（21276129，20876079）；韩国能源研究所资助（B3-2421-06）。

详细信息

通讯作者:
郭庆杰，男，教授，Tel：0532-84022757，Fax：0532-84022757，E-mail：qj_guo@yahoo.com。

中图分类号: TQ534.9
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出版历程
- 收稿日期: 2014-02-13
- 修回日期: 2014-06-04
- 刊出日期: 2014-09-30

Reactivity of Ca-Fe/bentonite oxygen carrier in coal chemical-looping combustion

Key Laboratory of Clean Chemical Processing of Shandong Province, Qingdao University of Science & Technology, Qingdao 266042, China

摘要

摘要: 以天然石膏粉、膨润土（bentonite）和Fe（NO₃）₃·9H₂O为原料，通过机械混合造粒法制备了钙基复合载氧体。在小型流化床反应器中，水蒸气作为气化-流化介质，研究了温度、活性组分含量及循环次数对复合载氧体反应活性的影响，同时考察了不同煤种化学链燃烧反应特性。实验结果表明，CaSO₄含量为60%，Fe₂O₃为活性助剂的CaSO₄-Fe₂O₃/ben（Ca-Fe/ben）载氧体平均磨损速率为0.089%/h。反应温度为900℃时，碳转化率达到95%所需的时间为20.8 min，CO₂平均干基浓度为95.99%，表现高的反应活性。10次氧化/还原反应后，CO₂平均干基浓度保持在80%，载氧体保持良好的循环反应活性。同时，实验发现高挥发分高灰分的煤种更适于煤的化学链燃烧，且CO₂浓度均保持在90%以上。粒径分布曲线表明循环反应中载氧体表现强的抗磨损能力。
- 钙基复合载氧体 /
- 化学链燃烧 /
- 流化床 /
- 循环反应性 /
- 煤 /
- 磨损
Abstract: A Ca-based compound oxygen carrier was prepared with industrial grade natural anhydrite, bentonite (ben) and iron nitrates by using the mechanical mixing-prilling method. The experiments were carried out in a fluidized bed with steam as the gasification-fluidization medium. The influence of active component content, temperature as well as multi-cycle on the reactivity between CaSO₄/bentonite and coal was investigated. The results show that the CaSO₄ mass content of 60% and the adding Fe₂O₃ can make a better reactivity and less attrition of the oxygen carrier particles. The attrition rate is 0.089%/h. The time to reach a carbon conversion of 95% is shortened to 20.8 min, and the average dry concentration of CO₂ approaches 95.99%. Ten redox tests demonstrate that the concentration of CO₂ can be kept in 80% and the CaSO₄-Fe₂O₃/ben (Ca-Fe/ben) oxygen carrier has a good cyclic stability. Moreover, four types of coal are tested, indicating that the coals with high volatile content and high ash content have higher combustion efficiencies with above 90% CO₂ concentration in gasification products in all cases.
- Ca-based compound oxygen carrier /
- chemical-looping combustion /
- fluidized-bed /
- cycle reactivity /
- coal /
- attrition

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参考文献(22)

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