期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 144, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jaap.2019.104714
关键词
Lignite; Straw; Co-Pyrolysis; Tar Upgrading; Catalytic cracking
资金
- National Natural Science Foundation of China [51704016]
- China Postdoctoral Science Foundation [2019TQ0030]
- Fundamental Research Funds for the Central Universities [FRF-TP-19-027A2]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRF17027]
- Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources [KF2019-6]
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2018-K12]
As pyrolysis and tar lightening are fundamentally intertwined, understanding the mechanism of integrated copyrolysis of lignite blended with corn straw and tar decomposition-carbon deposition over low-grade iron ores via unveiling terminal products is important for both eliminating heavy tar generation and improving renewable energy utilization efficiency. Here we report the effects of three iron ores with different structures as catalytic beds on the distribution of co-pyrolysis products. We elucidate that the goethite undergoes a phase transition to generate a structured tunnel, thus the subsequent tar upgrading and carbon deposition are more acceptable during the integrated co-pyrolysis and tar decomposition. In combination with tar yield and deposited carbon content, we identify that a synergistic effect existed in the co-pyrolysis process. The Optimum conditions were a co-pyrolysis temperature of 600 degrees C, an added corn straw proportion of 50% and a tar decomposition temperature of 650 degrees C. The whole coupling process exhibits that the formation rate of H-2 is always higher than that of the consumption of H-2 in the iron ore reduction, while the opposite trend was observed for CO. The content of light oil components with simulated distillation temperatures below 170 degrees C in tar was in the order of goethite > specularite > hematite. The changes of benzene, phenol, p-cresol and naphthalene in tar obtained by volatile matter over goethite exhibit significant differences. This paper provides insight on the effects of natural iron ore on products evolution during co-pyrolysis of lignite and corn stalk.
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