Research the Law of Gaseous Product Release in Co-Pyrolysis Process of Low-Rank Pulverized Coal by Thermo-Gravimetric Analyzer (TG) Coupled with Fourier Transform Infrared Spectroscopy (FTIR)
SONG Yong-hui, LEI Si-ming, MA Qiao-na, HE Wen-jin, ZHOU Jun, TIAN Yu-hong*, LAN Xin-zhe
Shaanxi Province Metallurgical Engineering and Technology Research Center, School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Abstract：The gaseous product release characteristic of the low-rank pulverized coal (SJC) in northern Shaanxi co-pyrolysis process with heavy oil (HS), coking coal (JM) and direct coal liquefaction residue (DCLR) were comparatively studied by the thermo-gravimetric analyzer (TG) coupled with fourier transform infrared spectroscopy (FTIR). The research showed that the SJC co-pyrolysis process with HS, JM and DCLR were divided into three stages, the first stage was the release of adsorbed substance from surface of the raw material, and the depolymerizing and decomposition reaction occurred in the second stage, and the third stage was the formation of a stabler semi-coke with the temperature increasing continuously. Coal and the additive have a synergistic effect during the second stage. As the major hydrogen donor, the SJC could generate the hydrogen free-radical in pyrolysis process interaction with small molecular free radical produced by HS, JM and DCLR pyrolysis process, and production of tar and gas. Around 450 ℃ temperature range, the pyrolysis process of SJC and SJC+DCLR were reacted more fully, and the majority of N element was transferred into the tar component. The gaseous product as water, phenols, heterocyclic nitrogen-containing compounds and CO of the pyrolysis process were released during the whole temperature interval of the pyrolysis. During the temperature of 400~650 ℃, the main reaction in the pyrolysis process of SJC+JM and SJC+HS was nitrogenous compounds transfer, the peak temperature of CH4 and aliphatic hydrocarbon compound release nearby 450 ℃, while the peak temperature of SJC+DCLR and SJC was 550 ℃. The aromatic compounds release in tar could be promoted by additive JM, HS and DCLR, generating a large amount of aromatic compounds during 400~550 ℃ in the pyrolysis process of SJC+JM and SJC+HS. The results of this study provided a theoretical foundation for the research and development of the new technology of low rank pulverized coal, which is of great significance to its value.
宋永辉，雷思明，马巧娜，贺文晋，周 军，田宇红，兰新哲. TG-FTIR法研究低变质煤共热解过程气体的析出规律[J]. 光谱学与光谱分析, 2019, 39(02): 565-570.
SONG Yong-hui, LEI Si-ming, MA Qiao-na, HE Wen-jin, ZHOU Jun, TIAN Yu-hong, LAN Xin-zhe. Research the Law of Gaseous Product Release in Co-Pyrolysis Process of Low-Rank Pulverized Coal by Thermo-Gravimetric Analyzer (TG) Coupled with Fourier Transform Infrared Spectroscopy (FTIR). SPECTROSCOPY AND SPECTRAL ANALYSIS, 2019, 39(02): 565-570.
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