Experimental Investigation of the Effects of Inorganic Components on the Supercritical Water Gasification of Semi-Coke

Panpan Sun (), Zhaobin Lv, Chuanjiang Sun, Hui Jin, Long He, Tong Ren and Zening Cheng ()
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Panpan Sun: College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Zhaobin Lv: College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Chuanjiang Sun: College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Hui Jin: State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Long He: College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Tong Ren: College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China
Zening Cheng: State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2024, vol. 17, issue 5, 1-14

Abstract: Inorganic components in coal play a significant role during the supercritical water gasification (SCWG) process. This study comprehensively investigated the effect of major mineral components (SiO 2 , Al 2 O 3 , and CaO) on the SCWG of semi-coke with/without K 2 CO 3 . The inhibition/promotion mechanism and conversion of mineral chemical components were explored. The results showed that, without K 2 CO 3 , CaO promoted gasification because CaO’s adsorption of CO 2 contributed to the fixed carbon steam reforming reaction and the catalysis of highly dispersed calcite. When K 2 CO 3 was added, SiO 2 and CaO were prone to sintering and agglomeration due to the formation of low-melting-point minerals, which hindered further gasification of fine carbon particles. Al 2 O 3 prevented the aggregation of slags, increased the probability of fine carbon particles contacting SCW and K 2 CO 3 , and promoted complete gasification. This study’s results may provide theoretical guidance for the directional control of minerals in coal during SCWG, and complete gasification of solid-phase carbon can be achieved by properly adjusting the mineral components.

Keywords: supercritical water gasification; semi-coke; mineral components; gasification effect (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: 2024
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