Blending principles of petroleum coke and low-rank coal to prepare high quality slurries

ABSTRACT

Gasification is an efficient and environmentally friendly treatment process for petroleum coke. But the rheology and stability of petroleum coke-water slurries (PWS) do not meet the feeding requirements of gasification. This study blends Hami coal (HM) with two petroleum cokes (Lianyungang (LYG) and Lanqiao (LQ)) to prepare high quality slurries. The results indicate that the properties of petroleum coke have significant effects on the blending slurries. With a certain amount of oxygen-containing functional groups and small molecular branched chains, LYG could be blended with HM to prepare high quality slurries with a maximum solid loading of 64.87%, static stability of 4 days, and a shear-thinning rheological behavior. However, HM could not provide the same benefits to the slurries prepared with LQ, as LQ exhibits a higher degree of aromatic carbonization. Aggregation state of the particles is the main reason behind this difference.

Graphical abstract

KEYWORDS:

• Petroleum coke
• low-rank coal
• coal water slurries
• rheological behavior
• slurryability
• gasification

Highlights

1 LYG coke and HM coal have a positive synergetic effect on dispersant adsorption.

2 Aggregation state of particles has important effects on the properties of slurries.

3 SEM and rheological curves show that large clusters could form among LYG particles.

4 EDS quantitative maps could distinguish petroleum coke particles from coal particles.

Abbreviations

LYG, Lianyungang petroleum coke; LQ, Lanqiao petroleum coke; HM, Hami coal; AU, Australian coal; LYG&HM, The blending sample of Lianyungang petroleum coke and Hami coal at 1:1 mass ratio; LQ&HM, The blending sample of Lanqiao petroleum coke and Hami coal at 1:1 mass ratio; LYG&AU, The blending sample of Lianyungang petroleum coke and Australian coal at 1:1 mass ratio; LQ&AU, The blending sample of Lanqiao petroleum coke and Australian coal at 1:1 mass ratio; CWS, Coal water slurries; PWS, Petroleum coke water slurries; PCWS, Petroleum coke-coal water slurries

Acknowledgments

This work was supported by the National Natural Science Foundation of China under Grant [21808097] and Grant [21902069]; and the Natural Science Foundation of Shandong Province under Grant [ZR2019PB030].

Author Statement

Dongmei Lv: Methodology, Writing-Reviewing and Editing; Huijun Wu: Data curation, Investigation; Jianzhang Niu: Writing-Original draft preparation; Yiyao Cheng: Formal analysis; Jing Li: Investigation, Formal analysis; Shuwen Gong: Writing-Reviewing and Editing; Wen Li: Conceptualization, Supervision.

Disclosure

☒ The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

☐ The authors declare the following financial interests/personal relationships which may be considered as potential competing interests.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China under Grant [21808097] and Grant [21902069]; and the Natural Science Foundation of Shandong Province under Grant [ZR2019PB030].