高致远, 曹晓蒙, 彭建平, 李轶斐, 王耀武, 狄跃忠. 添加真空蒸馏炭渣对炭阳极反应性的影响[J]. 工程科学学报, 2024, 46(2): 230-238. DOI: 10.13374/j.issn2095-9389.2022.11.11.004
引用本文: 高致远, 曹晓蒙, 彭建平, 李轶斐, 王耀武, 狄跃忠. 添加真空蒸馏炭渣对炭阳极反应性的影响[J]. 工程科学学报, 2024, 46(2): 230-238. DOI: 10.13374/j.issn2095-9389.2022.11.11.004
GAO Zhiyuan, CAO Xiaomeng, PENG Jianping, LI Yifei, WANG Yaowu, DI Yuezhong. Effects of vacuum-distilled carbon residue on the reactivity of carbon anode[J]. Chinese Journal of Engineering, 2024, 46(2): 230-238. DOI: 10.13374/j.issn2095-9389.2022.11.11.004
Citation: GAO Zhiyuan, CAO Xiaomeng, PENG Jianping, LI Yifei, WANG Yaowu, DI Yuezhong. Effects of vacuum-distilled carbon residue on the reactivity of carbon anode[J]. Chinese Journal of Engineering, 2024, 46(2): 230-238. DOI: 10.13374/j.issn2095-9389.2022.11.11.004

添加真空蒸馏炭渣对炭阳极反应性的影响

Effects of vacuum-distilled carbon residue on the reactivity of carbon anode

  • 摘要: 利用真空蒸馏炭渣替代部分煅后焦制作炭阳极可实现炭渣高值资源化,在有效利用真空蒸馏炭渣的同时也有着改善阳极反应性的潜力. 但真空蒸馏炭渣的添加量对含炭渣阳极反应性影响,及其对阳极原料的作用机制尚不明确. 本文在1200 ℃,真空度0.5~5 Pa的条件下对炭渣真空蒸馏,添加不同含量的真空蒸馏炭渣,与石油焦及沥青复合成含炭渣阳极,对阳极进行反应性检测. 采用同步热分析仪(TG-DSC)分析真空蒸馏炭渣对沥青热解过程的影响,采用热重分析仪(TG)、X射线衍射仪(XRD)、扫描电镜能谱仪(SEM-EDS)探究真空蒸馏炭渣对石油焦、沥青焦反应性的作用机理. 结果表明,随着真空蒸馏炭渣的添加量(质量分数)从3%增加到5%、7%、10%,炭渣对阳极空气反应性(600 ℃)起抑制作用,对阳极CO2反应性(970 ℃)起先抑制后催化的作用. 添加真空蒸馏炭渣可提高沥青的结焦率,以及沥青焦、石油焦的炭化程度,从而抑制阳极空气反应性(600 ℃);高温下炭渣中的微量元素对沥青焦气化反应的促进作用,是高含量炭渣催化阳极CO2反应性(970 ℃)的主要原因.

     

    Abstract: The use of vacuum-distilled carbon residues to replace part of prebaked carbon coke reflects the high-value resource utilization of carbon residues and has the potential to improve the anode reactivity. However, the effect of adding vacuum-distilled carbon residues on the anode reactivity and its mechanism on the anode raw materials remain unclear, which has become a technical bottleneck hindering the application of carbon slag anodization. In this study, carbon residue was vacuum-distilled at 1200 ℃, and the degree of vacuum was 0.5–5 Pa. Vacuum-distilled carbon residue was compounded with petroleum coke and asphalt to form anodes with carbon residues, and the phase composition of vacuum-distilled carbon residues in anode reactivity was tested. A simultaneous thermal analyzer (TG-DSC) was used to analyze the influence of vacuum-distilled carbon residue on the pyrolysis reaction of asphalt. A thermogravimetric analyzer (TG), an X-ray diffractometer (XRD), and a scanning electron microscope-energy-dispersive spectrometer (SEM-EDS) were used to explore the reaction mechanism of vacuum-distilled carbon residues on petroleum and pitch coke. The results show that with the addition of vacuum-distilled carbon residues increasing from 3% to 5%, 7%, and 10% (Mass fraction), carbon residue has an inhibitory effect on the anode air reactivity (600 ℃). In the same addition amount change range of vacuum-distilled carbon residues, the anode CO2 reactivity (970 ℃) is firstly decreased to 27.97 mg·cm–2·h–1 and then increased to 50.16 mg·cm–2·h–1. Vacuum-distilled carbon residues can catalyze not only the pyrolysis reaction of asphalt but also the polycondensation reaction of asphalt. A small amount of vacuum-distilled carbon residues mainly affects the coking of asphalt through the polycondensation reaction, but has no obvious effect on the pyrolysis reaction of asphalt, which can increase the asphalt coking rate. In contrast, high amounts of vacuum-distilled carbon residues have a large influence on the pyrolysis reaction of asphalt, and vacuum-distilled carbon residues mainly affected asphalt coking through pyrolysis, which reduced the asphalt coking rate. The effect of vacuum-distilled carbon dust on the anode reactivity was attributed to chemical and structural factors. The addition of vacuum-distilled carbon residues can improve the coking rate of asphalt and the carbonization degree of asphalt coke and petroleum coke, which inhibit the anode air reactivity. The catalytic effect of trace elements in carbon residues on the gasification reaction of pitch coke at high temperatures is the main reason for the catalytic the anode’s CO2 reactivity with the addition of large amounts of carbon residues.

     

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