CIESC Journal ›› 2019, Vol. 70 ›› Issue (5): 1923-1931.DOI: 10.11949/j.issn.0438-1157.20181452

• Energy and environmental engineering • Previous Articles     Next Articles

Utilization of converter off-gas based on chemical-looping combustion

Yongjian WU1(),Chunhuan LUO1,2,Lin WEI1,Tanjin ZHU1,Qingquan SU1,2()   

  1. 1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2. Beijing Key Laboratory of Energy Conservation and Emission Reduction for Metallurgical Industry, Beijing 100083, China
  • Received:2018-12-05 Revised:2019-02-11 Online:2019-05-05 Published:2019-05-05
  • Contact: Qingquan SU

基于化学链燃烧的转炉放散煤气利用研究

武永健1(),罗春欢1,2,魏琳1,朱探金1,苏庆泉1,2()   

  1. 1. 北京科技大学能源与环境工程学院,北京 100083
    2. 北京冶金工业节能减排重点实验室,北京 100083
  • 通讯作者: 苏庆泉
  • 作者简介:<named-content content-type="corresp-name">武永健</named-content>(1992—),男,博士研究生,<email>wuyongjian@xs.ustb.edu.cn</email>|苏庆泉(1961—),男,博士,教授,<email>suqingquan@ustb.edu.cn</email>
  • 基金资助:
    北京市科技基金资助项目(Z131100005613045)

Abstract:

Characteristics of the reduction reactions between transition metal oxide oxygen carriers (OCs) including MnO2/Al2O3, Fe2O3/Al2O3 and CuO/Al2O3 prepared by an impregnation method and CO in converter off-gas were investigated using a fixed bed reactor and a thermogravimetric analyzer. Surface area analysis, pulse chemisorption and scanning electron microscopy were used to characterize the cycle life performance of CuO/Al2O3. The results show that CuO/Al2O3 exhibit the best reactivity among the three OCs, and the CO conversion at the reaction time of 2 min reach 90% when the reaction temperature is 225℃ or higher. Moreover, CuO/Al2O3 can maintain the high and stable performance of CO removal and mechanical strength at 350℃, a gas hourly space velocity (GHSV) of 4000 h-1 in the reduction reaction and a GHSV of 159 h-1 in the oxidation reaction, exhibiting an excellent redox cycle life. Based on these findings, a new process based on CLC has been proposed, with which the intermittently discharged converter off-gas can be safely utilized, thereby achieving the continuous heat supply to users.

Key words: converter off-gas, carbon monoxide, chemical-looping combustion, oxygen carrier, reduction, oxidation, cycle life, fixed-bed reactor

摘要:

在固定床反应器和热重分析仪上对浸渍法制备的过渡金属氧化物载氧体MnO2/Al2O3、Fe2O3/Al2O3和CuO/Al2O3与转炉放散煤气中CO的反应特性进行了研究,并结合比表面积分析、脉冲化学吸附和扫描电镜等手段表征了CuO/Al2O3的循环寿命性能。结果表明,在上述三种载氧体中CuO/Al2O3表现出了最佳的反应活性,反应进行2 min时的CO转化率在225℃以上的反应温度下就能达到90%。在350℃、还原反应空速4000 h-1和氧化反应空速159 h-1的条件下,CuO/Al2O3能够保持良好且稳定的CO脱除性能和机械强度,因而具有良好的循环寿命。据此,提出了基于化学链燃烧的转炉放散煤气利用新工艺,本工艺可安全利用间歇排放的转炉放散煤气,并实现对用户的连续供热。

关键词: 转炉放散煤气, CO, 化学链燃烧, 载氧体, 还原, 氧化, 循环寿命, 固定床反应器

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