白云鄂博铁精矿基铜铁复合载氧体化学链燃烧反应性研究
Study on the chemical chain combustion reactivity of copper-iron composite oxygen carrier prepared by Bayan Obo iron ore concentrate and CuO
韩爱民 1隋子峰 1张鹏飞 1王其浩 1吕青岗 2陈伟鹏1
作者信息
- 1. 内蒙古科技大学能源与环境学院,内蒙古包头 014010
- 2. 包头包钢钢联股份有限公司,内蒙古包头 014010
- 折叠
摘要
白云鄂博铁矿是铁、稀土等多种有用矿物共生矿,具有较高活性,资源丰富价格低廉,通过煅烧合成法,将其与氧化铜的混合物制备成尖晶石CuFe2O4载氧体,以开发性能优化、价格低廉且环保的化学链燃烧载氧体.通过热重和小型固定床实验分别进行载氧体的还原性和循环稳定性研究,并结合XRD表征对反应特性及机制进行深入分析.结果表明:Cu的添加使铁精矿还原性增强;复合载氧体的还原-氧化循环活性和循环稳定性远好于原矿载氧体;制备温度900 ℃时,铁精矿中的Fe2O3可以充分反应生成CuFe2O4,且CuFe900载氧体的化学链燃烧反应性和循环特性最好.
Abstract
Bayan obo iron ore,coexisting with multiple valuable minerals such as iron and rare earth elements,ex-hibits high reactivity,abundant resources,and low cost.By employing the calcination synthesis method,a mixture of this ore with copper oxide is prepared into a spinel CuFe2O4 oxygen carrier,aiming to develop a performance-op-timized,cost-effective,and environmentally friendly oxygen carrier for chemical looping combustion.The reduc-ibility and cyclic stability of the oxygen carrier were investigated through thermogravimetric analysis and small fixed-bed experiments,complemented by XRD characterization for an in-depth analysis of reaction characteristics and mechanisms.The results demonstrate that the addition of copper significantly enhances the activity of the iron concentrate oxygen carrier,improves the high-temperature resistance and anti-sintering stability of the copper ox-ide oxygen carrier,and forms a more stable spinel structure of CuFe2O4,exhibiting excellent synergistic effects.The CO program warming test illustrated that the reduction reaction of the copper-iron composite oxygen carrier primarily involves CuFe2O4,proceeding in three stages:in the first stage,CuFe2O4 is reduced to Cu and Fe3O4 at low temperatures with the highest reactivity;the second and third stages involve the reduction of Fe3O4 to FeO and then FeO to Fe,respectively.During 26 reduction-oxidation cycles,the CuFe900 oxygen carrier displayed no sig-nificant sintering,maintaining good reactivity and cyclic stability.
关键词
化学链燃烧/载氧体/白云鄂博铁精矿/尖晶石CuFe2O4/煅烧工况Key words
chemical-looping combustion/oxygen carrier/Bayan Obo iron concentrate/spinel CuFe2O4/calcina-tion condition引用本文复制引用
基金项目
包头市科技局应用技术研发项目(YF2020009)
内蒙古自治区高等学校科学研究项目(NJZZ23061)
出版年
2024
NETL
NSTL
万方数据