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| FTIR Quantitative Analysis of Evolution and Interaction of Plastic Layer in Coking Process |
| TIE Wei-bo1, WANG Qi1*, GAN Xiu-shi2, WANG Xu2, HUANG Jun-chen1, YANG Song-tao1, ZHANG Song1 |
1. Department of Metallurgical Engineering, College of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China
2. Anshan Iron & Steel Research Institute, Anshan 114009, China
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Abstract The plastic layer is an important intermediate phase in the coking process. Its structure evolution and the interference between different structures in the coal blending process are of great significance for understanding coal's properties and the blending's interaction mechanism. This paper used self-made coking-related properties measuring device to conduct coking experiments on different blend ratios. The evolution products of the plastic layer were obtained by the interrupted cooling method, including the softening zone (SFZ), melting zone (MPBZ), flow zone (MZ), and resolidification zone (RSZ). FTIR determined the raw materials that were obtained. FTIR was divided into four bands of 3 600～3 000, 3 000～2 800, 1 800～1 000 and 900～700 cm-1 for peak fitting analysis. I-aromatization, DOC-polycondensation degree, —CH2— aliphatic structure, A'-hydrocarbon generation capacity, and C-oxygen-containing functional group were used to explore the changes in the coking process and the interaction among the same evolution products of blends with different mass ratios. The results show that I and DOC increased gradually in the special temperature field, and the changes were particularly significant from MZ to RSZ. With the release of volatiles and tar, the aliphatic group —CH2 and A' as a whole showed a downward trend. The content of C fluctuates slightly in MPBZ and MZ, but the overall trend is also downward. The condensation of aromatic carbon structure induces the decomposition of aliphatic structure and oxygen-containing functional groups. MZ to RSZ in the plastic layer is an important part of coking process. TheI1 and DOC of the same evolution products of mixed coals with different mass ratios have good additive properties in SFZ, MPBZ, and MZ, with the degree of fitting R2 reaching 0.744, 0.71, 0.775 and 0.74, 0.266, 0.773 respectively. The interaction of other structures is influenced by many factors of the process of pyrolysis and bonding, so these do not have additivity. Therefore, the aromatic carbon structure at the resolidification zone and the lack of additivity of the aliphatic structure and heteroatoms are important factors affecting the different properties of coke.
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Received: 2023-02-21
Accepted: 2024-01-17
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Corresponding Authors:
WANG Qi
E-mail: wangqi8822@sina.com
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