Characterizations of the hot blast furnace slag on coal gasification reaction. (5th April 2016)

• Record Type: Journal Article
• Authors: Duan, Wenjun; Yu, Qingbo; Liu, Junxiang; Hou, Limin; Xie, Huaqing; Wang, Kun; Qin, Qin
• Is Part Of: Applied thermal engineering. Volume 98(2016:Apr.)
• Page Start: 936
• Page End: 943
• Publication Date: 2016-04-05
• Subjects: BFS waste heat -- Coal gasification -- Heat carrier -- Reactant -- Catalyst -- Sulfide capacity; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2015.12.029
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: The role of BFS in coal gasification reaction was comprehensively investigated. Slag could act as not only heat carrier, but also the catalysts and reactants. The reactivity of the coal was significantly improved by BFS. Contents of CO and H2 increased significantly when gasification was conducted with BFS. Slag had excellent sulfide capacity, and 74.45% of sulfide in DT coal was absorbed. Abstract: The main objective of this research was to comprehensively investigate the role of the hot blast furnace slag (BFS) played in coal gasification reaction process so as to improve the utilization of BFS waste heat and enhance H2 and CO content in the syngas. The BFS characterizations, such as the heat carrier, catalyst, reactant, and the sulfide capacity were investigated. The results indicated that about 61% BFS waste heat could be recovered by coal gasification, and the exergy loss (EXL) of which was only 409 MJ⋅t −1 slag . Therefore, the BFS was the favorable heat carrier for coal gasification reaction. Besides, the activation energy ( Ea ) and pre-exponential factor ( A 0 ) for the coal gasification with slag were essentially lower and the reactivity of the coal was significantly improved when the coal was mixed with BFS. The BFS showed a better performance in improving the coal gasification reaction. In the syngas, the CO and H2 content increased and the CO2 and CH4 content decreased with BFS as heat carrier. In addition, the molten BFS had excellent sulfide capacity ( Cs = 1.8604 × 10 −4 ) known from the theoretical analysis. About 74.45% of the sulfur and sulfide in Datong (DT) coal was absorbed by BFS so that the emission of the hazardous gases reduced significantly.