Improving slurryability, rheology, and stability of slurry fuel from blending petroleum coke with lignite

• Published in: Petroleum science Vol. 12; no. 1; pp. 157 - 169
• Main Authors: Wu, Jun-Hong, Liu, Jian-Zhong, Yu, Yu-Jie, Wang, Rui-Kun, Zhou, Jun-Hu, Cen, Ke-Fa
• Format: Journal Article
• Language: English
• Published: Beijing China University of Petroleum (Beijing) 01.03.2015; State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China
• Subjects: Earth and Environmental Science; Earth Sciences; Economics and Management; Energy Policy; Industrial and Production Engineering; Industrial Chemistry/Chemical Engineering; Mineral Resources; Original Paper; 化石燃料; 流变学; 混合物; 焦炭; 煤浆; 石油焦; 稳定性; 褐煤; Coal–water slurry; Rheological characteristics; Lignite; Slurry stability; Petroleum coke; Coal-water slurry
• ISSN: 1672-5107; 1995-8226
• DOI: 10.1007/s12182-014-0008-3

Petroleum coke and lignite are two important fossil fuels that have not been widely used in China. Petroleum coke-lignite slurry （PCLS）, a mixture of petro- leum coke, lignite, water, and additives, efficiently utilizes the two materials. In this study, we investigate the effects of the proportion （7） of petroleum coke on slurryability, rheo- logical behavior, stability, and increasing temperature characteristics of PCLSs. The results show that the fixed- viscosity solid concentration （COo） increases with increasing 7. The ~Oo of lignite-water slurry （LWS, ~ = 0） is 46.7 %, compared to 71.3 % for the petroleum coke-water slurry （PCWS, c~ --- i00 %）, while that of PCLS is in between the two values. The rheological behavior of PCLS perfectly fits the power-law model. The PCWS acts as a dilatant fluid. As decreases, the slurry behaves first as an approximate Newtonian fluid, and then turns into a pseudo-plastic fluid that exhibits shear-thinning behavior. With increasing ct, the rigid sedimentation and water separation ratio （WSR） increase, indicating a decrease in the stability of PCLS. When α is 60-70 %, the result is a high-quality slurry fuel for industrial applications, which has high slurryability （ω0 = 57-60 %）, good stability （WSR 〈 2 %）, and superior pseudo-plastic behavior （n = 0.9）.