红砖掺杂改性白云鄂博铁精矿载氧体性能

doi:10.16085/j.issn.1000-6613.2023-0549

摘要/Abstract

摘要：

采用机械混合法，添加建筑固废红砖粉末制备改性白云鄂博铁精矿载氧体，通过热重分析仪和管式炉实验，分析红砖粉末添加量对CO化学链燃烧性能优化效果，并通过扫描电子显微镜、X射线衍射、比表面积分析以及动力学分析等表征手段分析其机制。结果表明，通过DTG曲线可以看出白云鄂博铁精矿载氧体与CO的反应温度基本都高于800℃，红砖粉末改性载氧体可以提升化学链燃烧反应速率，加快反应进程，特别是2.5%红砖改性样品，在950℃下反应效果是最优的，CO₂产率达到了87%；通过对程序升温实验数据进行动力学分析，发现红砖粉末可以缩短其与CO的反应时间，加快反应进程，并且基于循环反应实验，改性载氧体表现出了更稳定的碳转化率。其反应能力的提升和循环稳定性的加强主要是由于红砖粉末使载氧体具有更高的比表面积和孔隙结构所致。

关键词: 铁精矿, 化学链燃烧, 载氧体, 建筑固废, 动力学分析

Abstract:

The modified Baiyun Obo iron ore concentrate oxygen carrier was prepared by mechanical mixing method with the addition of red brick powder from construction solid waste, and the effect of red brick powder addition on CO chemical chain combustion performance was analyzed by thermogravimetric analyzer and tube furnace experiments, and the mechanism was analyzed by means of characterization such as SEM, XRD, BET, and kinetic analyses. Through the DTG curve, it could be seen that the reaction temperature of Baiyun Ebo iron ore concentrate carrier with CO was basically higher than 800℃, and the red brick powder modified carrier could enhance the chemical chain combustion reaction rate and accelerate the reaction process, especially for the 2.5% red brick modified sample, the reaction effect was optimal at 950℃, and the CO₂ yield reaches 87%. The kinetic analysis of the programmed heating experimental data revealed that the red brick powder could shorten the reaction time with CO and accelerate the reaction process, and based on the cyclic reaction experiments, the modified oxygen carrier exhibited a more stable carbon conversion rate. The improved reactivity and enhanced cyclic stability were mainly due to the higher specific surface area and pore structure of the oxygen carriers by the red brick powder.

Key words: iron ore concentrate, chemical looping combustion, oxygen carriers, construction solid waste, kinetic analysis

中图分类号:

TK16

张鹏飞, 陈伟鹏, 肖卓楠, 吕青岗, 张顺风, 张子峰. 红砖掺杂改性白云鄂博铁精矿载氧体性能[J]. 化工进展, 2024, 43(4): 2226-2234.

ZHANG Pengfei, CHEN Weipeng, XIAO Zhuonan, LYU Qinggang, ZHANG Shunfeng, ZHANG Zifeng. Red brick doping modified Baiyun Obo iron ore concentrate oxygen carrier performance[J]. Chemical Industry and Engineering Progress, 2024, 43(4): 2226-2234.

图/表 13

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配比/%	失氧率/%
配比/%	800℃	850℃	900℃	950℃
2.5	22.4	26.8	25.8	29.2
5	20.6	24.9	25.7	25.5
7.5	15.9	19.9	18.4	21.9
10	17.2	23.3	22.5	19.1

配比/%	失氧率/%
配比/%	800℃	850℃	900℃	950℃
2.5	22.4	26.8	25.8	29.2
5	20.6	24.9	25.7	25.5
7.5	15.9	19.9	18.4	21.9
10	17.2	23.3	22.5	19.1

函数模型	系数数值
函数模型	735.2~925.6℃	925.6~971.3℃
收缩核N=1	0.99928	0.99769
收缩核N=2	0.99923	0.98066
收缩核N=3	0.99913	0.97138
成核与核增长速度N=1	0.99877	0.94911
成核与核增长速度N=1.5	0.99873	0.94673
成核与核增长速度N=2	0.99867	0.94414
成核与核增长速度N=3	0.99857	0.93842
化学反应N=1.5	0.99786	0.91254
化学反应N=2	0.99652	0.88052
化学反应N=3	0.99706	0.97483
二维扩散（valensi）	0.99921	0.99103
三维扩散（jander）	0.99917	0.97302
三维扩散（grinstling）	0.99924	0.98558

函数模型	系数数值
函数模型	735.2~925.6℃	925.6~971.3℃
收缩核N=1	0.99928	0.99769
收缩核N=2	0.99923	0.98066
收缩核N=3	0.99913	0.97138
成核与核增长速度N=1	0.99877	0.94911
成核与核增长速度N=1.5	0.99873	0.94673
成核与核增长速度N=2	0.99867	0.94414
成核与核增长速度N=3	0.99857	0.93842
化学反应N=1.5	0.99786	0.91254
化学反应N=2	0.99652	0.88052
化学反应N=3	0.99706	0.97483
二维扩散（valensi）	0.99921	0.99103
三维扩散（jander）	0.99917	0.97302
三维扩散（grinstling）	0.99924	0.98558

函数模型	系数数值
函数模型	790.2~822.2℃	920.1~962.3℃
收缩核N=1	0.99009	0.99954
收缩核N=2	0.99086	0.99966
收缩核N=3	0.9911	0.99969
成核与核增长速度N=1	0.99157	0.99972
成核与核增长速度N=1.5	0.99101	0.99952
成核与核增长速度N=2	0.9904	0.99903
成核与核增长速度N=3	0.98897	0.93732
化学反应N=1.5	0.99225	0.99973
化学反应N=2	0.99288	0.99971
化学反应N=3	0.99403	0.99962
二维扩散（valensi）	0.99118	0.99977
三维扩散（jander）	0.99164	0.99981
三维扩散（grinstling）	0.99134	0.9997