Gasification Characteristics of High Moisture Content Lignite under CO 2 and Auto-Generated Steam Atmosphere in a Moving Bed Tubular Reactor

Haojie Gao (), Zhisong Wen, Lizhu Jin, Xin Xiong and Yuezhao Zhu
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Haojie Gao: School of Automotive Engineering, Yancheng Institution of Technology, Yancheng 224051, China
Zhisong Wen: School of Automotive Engineering, Yancheng Institution of Technology, Yancheng 224051, China
Lizhu Jin: School of Automotive Engineering, Yancheng Institution of Technology, Yancheng 224051, China
Xin Xiong: School of Automotive Engineering, Yancheng Institution of Technology, Yancheng 224051, China
Yuezhao Zhu: School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China

Energies, 2022, vol. 15, issue 18, 1-10

Abstract: An external thermal high-temperature continuous feed moving bed tubular reactor was used for the gasification of high moisture content lignite (30.41 wt.%) under CO 2 and an auto-generated steam atmosphere. The objectives of this study are to illustrate the synergistic gasification characteristics of high moisture content lignite and CO 2 in the tubular reactor; CO 2 and auto-generated steam (steam released from the lignite) were used as gasification agents for lignite gasification. The effects of temperature and CO 2 flow rate were also investigated. Experimental results showed that when the gasification temperature increased from 800 °C to 1000 °C, the H 2 yield also increased from 8.45 mol kg −1 to 17.86 mol kg −1 . This may indicate that the H 2 O-CO 2 gasification of semi-coke was enhanced with the rise in temperature. At 900 °C, the gas yield increased with the increase in CO 2 flow rate, while the yield of char and liquid product showed an opposite trend. The lower heating value of the H 2 -rich syngas varied from 11.73 MJ m −3 to 12.77 MJ Nm −3 . The experimental results proved that the high moisture content lignite in-situ CO 2 gasification process is an effective methodology for the clean and efficient utilization of lignite.

Keywords: lignite; CO 2 gasification; moisture content; temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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