摘要
针对化学链燃烧中金属载氧体表面积碳现象影响其活性的问题,本研究借助小型流化床实验台,研究了在不同反应温度(650、750、850和950℃)及反应气氛(CH_4和CO+H_2)下,机械混合法制备Ni基和Fe基两种金属载氧体的碳沉积特性,并探讨了加入水蒸气或CO_2对金属载氧体还原反应积碳过程的抑制作用.结果表明:在两种反应气氛中,金属载氧体均出现不同程度的积碳现象,但CO+H_2气氛下积碳量较少;加入水蒸气或CO_2能够明显抑制金属载氧体表面积碳现象;且在CO气氛下,加入水蒸气可完全消除金属载氧体表面积碳;XRD(X射线衍射)结果进一步表明加入水蒸气或CO_2可有效抑制金属载氧体表面积碳的产生,且水蒸气的抑制效果优于CO_2。
In the light of the problem that carbon deposited on the surface of a metal oxygen carrier in a chemical chain combustion process will affect its activity,with the help of a small-scale test rig,studied were the carbon deposition characteristics of two kinds of metal oxygen carrier( Ni and Fe based) prepared at various reaction temperatures( 650℃,750 ℃,850 ℃ and 950 ℃) in different reaction atmospheres( CH_4 and CO + H2) by using the mechanical mixing method and probed was the inhibition action of steam or carbon dioxide added on the carbon deposition process of metal oxygen carriers during their reduction reactions. It has been found that in both reaction atmospheres,the carbon deposition phenomena to various extents will occur to the metal oxygen carriers,however,in the CO + H_2 atmosphere,the amount of carbon deposited is relatively small and an addition of steam or carbon dioxide can obviously inhibit the carbon deposited on the surface of the metal oxygen carriers and in the CO atmosphere,an addition of steam can totally remove the carbon deposited on the surface of metal oxygen carriers. The XRD( X-ray diffraction) analytic results further show that an addition of steam or carbon dioxide can effectively inhibit the production of carbon deposited on the surface of metal oxygen carriers and the inhibition effectiveness of steam is supe-rior to that of carbon dioxide.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第5期88-92,154,共5页
Journal of Engineering for Thermal Energy and Power
基金
国家"十二五"科技支撑基金资助项目(2015BAA04B03)
上海市基础研究重点基金资助项目(14JC1404800)
上海理工大学准东煤高效利用协同创新平台基金资助项目
关键词
化学链燃烧
金属载氧体
积碳特性
水蒸气
chemical chain combustion
metal oxygen carrier
carbon deposition characteristics
steam
作者简介
胡强（1991-），男，江西赣州人，上海理工大学硕士研究生．
通讯作者：金晶（1963-），女，山东济南人，上海理工大学教授，博士生导师．
