Experimental study on mass and morphological character during scrap tire pyrolysis

doi:10.11949/0438-1157.20241256

Abstract

Abstract:

Pyrolysis is a crucial pathway for the high-value resource utilization of waste tires. The research on the mass and morphological changes of tire particles during the pyrolysis process is essential for optimizing the design of pyrolysis reactors. Based on the custom-built image analysis system, experiments on the mass and morphological changes of tire particles under different temperatures were conducted. The results indicated that reaction temperature had a significant influence on the pyrolysis rate. When the temperature increases from 400℃ to 600℃, the maximum pyrolysis rate was enhanced by approximately 1.9 times. In addition, the tire particles undergo a dynamic change process of expansion, cracking, and collapse during the pyrolysis process, and the cracking stage is accompanied by a rapid decrease in mass. Meanwhile, the pyrolysis temperature had a significant effect on the time interval between the appearance of peak expansion rate and mass loss rate.

Key words: waste treatment, tire particles, pollution, pyrolysis, mass loss, macro-optical image analysis, morphological changes

摘要：

热解是废轮胎高值资源化利用的重要途径，研究废轮胎颗粒热解过程中质量及形态变化对于优化设计热解反应装置具有重要意义。基于自行搭建设计的光学图像分析可视化热解实验装置，开展了不同温度下轮胎颗粒热解过程中的质量及形态变化实验。研究结果表明，反应温度对热解反应速率具有显著影响。当温度从400℃升高至600℃时，最大热解反应速率提高了约1.9倍。此外，轮胎颗粒在热解过程中经历了先膨胀、再开裂、后塌缩的动态变化过程，开裂阶段伴随着质量的快速下降。同时，热解温度对膨胀倍率和失重速率峰值出现的时间间隔具有显著影响。

关键词: 废物处理, 轮胎颗粒, 污染, 热解, 失重, 光学图像分析, 形态变化

CLC Number:

TE 992.3

Shuyu WANG, Zhiliang XUE, Jing ZHU, Xin FU, Yonggang ZHOU, Yiming HU, Qunxing HUANG. Experimental study on mass and morphological character during scrap tire pyrolysis[J]. CIESC Journal, 2025, 76(7): 3459-3467.

王树宇, 薛志亮, 朱静, 付鑫, 周永刚, 胡一鸣, 黄群星. 废弃全钢胎颗粒热解过程中质量和形态变化研究[J]. 化工学报, 2025, 76(7): 3459-3467.

Figures/Tables 12

Table 1 Proximate analysis and ultimate analysis of tire particles

工业分析/%				Q_b,_ad/(J/g)	元素分析/%
M_ad	A_ad	V_ad	FC_ad	Q_b,_ad/(J/g)	C_ad	H_ad	N_ad	S_ad	O_ad
1.12	6.39	62.67	29.82	37020.4	78.96	7.08	1.01	2.08	3.36

Fig.1 Experimental setup for pyrolysis

Fig.2 Image processing logic diagram of tire particles

Fig.3 Image extraction process of tire particles

Fig.4 Mass change curves of tire particles at different temperatures

Fig.5 Mass loss rate curves of tire particles at different temperatures

Fig.6 Morphological changes of tire particles at different temperatures

Fig.7 Expansion ratio curves of tire particles at different temperatures

Fig.8 Schematic diagram of the morphological changes of tire particles during the pyrolysis process

Fig.9 Expansion ratio and mass change curves of tire particles at different temperatures

Fig.10 Expansion rate and mass loss rate curves of tire particles at different temperature

Fig.11 A typical spiral pyrolysis reactor

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