SPECTROSCOPIC ANALYSIS OF PRODUCTS FROM LOW-RANK COAL MICROWAVE PYROLYSIS: EFFECT OF REACTION ATMOSPHERE
Abstract
The pyrolysis of low-rank coal is considered as the optimal method of realizing clean and efficient production of blue coke, tar, and gas. The experiments of low-rank coal microwave pyrolysis under CO2, CH4, H2, and circulating gas (CG) are studied in a custom-designed microwave oven to clearly clarify the effects of reaction atmospheres on pyrolysis temperature, products yields, and spectroscopic characteristics of pyrolysis products by the analysis techniques of FT-IR and GC-MS. The results show that among four pyrolysis atmospheres, the temperature-rise rate and final pyrolysis temperature under H2 atmosphere are both highest, taking only 5.6 min to arrive at 750°C, and the final temperature is greater than 950°C. The liquid yields under CO2, CH4, H2, and CG atmospheres are 21.8, 24.4, 28.2, and 26.8 wt.%, respectively. The contents of -OH, aromatic ring C=C double bond, and -C=O in the solid product under CH4 atmosphere are highest, possibly because of the thermal polycondensation and the secondary degassing of the solid product. The hydrogenation of H free radicals dissociated from “rich hydrogen” gas results in an improvement in the alkane content and a decrease in the aromatic hydrocarbon content in tar, which is confirmed by the change in oxygen content in the solid product. The hydrogenation technique of circulating coal gas on low-rank coal microwave pyrolysis is economical, energy-efficient, and feasible, which is helpful in the development of coal processing technologies.
Supporting agencies: We thank the Shaanxi Provincial Natural Science Foundation Program for Key Basic Research of China (No. 2017ZDJC-33), the National Natural Science Foundation Program of China (No. 51774227), the Natural Science Foundation Program of Shaanxi Province for Joint fund project (No. 2019JLP-17 and No. 2019JLM-42), and Innovation Capability Support Program of Shaanxi (No. 2020TD- 028) for support. We also acknowledge the youth observation program of new urbanization in 2018, which is supported by the Research Institute of New Urbanization and Human Settlement in Shaanxi Province.
About the Authors
J. Zhou
School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology; Research Centre of Metallurgical Engineering & Technology of Shaanxi Province
China
China
Xi’an 710055, Shaanxi
L. Wu
School of Metallurgical Engineering, Xi’an University of Architecture and Technology
China
Xi’an 710055, Shaanxi
China
Xi’an 710055, Shaanxi
K. Liang
School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology
China
Xi’an 710055, Shaanxi
China
Xi’an 710055, Shaanxi
J. Zhou
School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology
China
Xi’an 710055, Shaanxi
China
Xi’an 710055, Shaanxi
Q. Zhang
School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology; Research Centre of Metallurgical Engineering & Technology of Shaanxi Province
China
Xi’an 710055, Shaanxi
China
Xi’an 710055, Shaanxi
Y. Song
School of Metallurgical Engineering, Xi’an University of Architecture and Technology; Research Centre of Metallurgical Engineering & Technology of Shaanxi Province
China
Xi’an 710055, Shaanxi
China
Xi’an 710055, Shaanxi
Y. Tian
School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology; Research Centre of Metallurgical Engineering & Technology of Shaanxi Province
China
Xi’an 710055, Shaanxi
China
Xi’an 710055, Shaanxi
X. Lan
Research Centre of Metallurgical Engineering & Technology of Shaanxi Province
China
Xi’an 710055, Shaanxi
China
Xi’an 710055, Shaanxi
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Review
For citations:
Zhou J., Wu L., Liang K., Zhou J., Zhang Q., Song Y., Tian Y., Lan X. SPECTROSCOPIC ANALYSIS OF PRODUCTS FROM LOW-RANK COAL MICROWAVE PYROLYSIS: EFFECT OF REACTION ATMOSPHERE. Zhurnal Prikladnoii Spektroskopii. 2020;87(4):679(1)-679(9).
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