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CFD simulation on the gasification of asphalt water slurry in an entrained flow gasifier

Petroleum Science 2014年第2期11卷 308-317页

作者： Lan Xingying Zhong Hanbin Gao Jinsen State Key Laboratory of Heavy Oil Processing China University of Petroleum

Gasification technology is suggested to utilize asphalt particles, which are produced in the heavy oil deep separation process of using coupled low temperature separation of solvent and post extraction residue. In this work, the asphalt particles were first slurried with water and then gasified to produce synthesis gas. The gasification process of asphalt water slurry in an entrained flow gasifier was simulated using a three-dimensional computational fluid dynamics （CFD） model based on an Eulerian- Lagrangian method. The trajectories and residence time of asphalt particles, and the reaction rates, gas species distribution, temperature field and carbon conversion in the entrained flow gasifier were obtained. The predicted results indicated that the asphalt water slurry was a good feedstock for gasification. Moreover, the effects of particle size, oxygen equivalence ratio, and mass content of asphalt particles on the gasification performance of asphalt water slurry were investigated. These results are helpful for industrial application of asphalt water slurry gasification technology.

关键词： Asphalt particles water slurry gasification entrain flow gasifier CFD

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Effects of High-Power Ultrasonic Treatment on the slurryability of Coals

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Journal of China University of Mining and Technology 2007年第4期17卷 562-565页

作者： CUI Guang-wen ZHU Shu-quan ZOU Li-zhuang XIE Wei-wei School of Chemical and Environmental Engineering China University of Mining ＆ Technology Beijing 100083 China School of Chemical and Environmental Engineering Shandong University of Science and Technology Qingdao Shandong 266510 China

To improve slurryability,high power ultrasonic energy was used to treat coal slurry. The influence of power on the slurryability of raw coals and on the maximum hydro-content (MHC) was investigated by measuring the apparent viscosity before and after treatment. The experimental results show that the effect of treatment on sluryability is different for different rank coals under the same treatment conditions. The coals metamorphosed to lower degree are more sensitive to the ultrasonic treatment. The apparent viscosity of slurries from coal metamorphosed to medium degree clearly decreases after the ultrasonic treatment. The ultrasonic treatment makes MHC decrease,which improves the slurryability. For Shenmu or Hebi coal slurry after 3 min. treatment the maximum fixed-viscosity concentration is increased by about 0.4% and 0.3%,respectively,when the ultrasonic power is 100 W. The maximum fixed-viscosity concentration increased 2.4% and 1.7%,respectively,when the ultrasonic power was 300 W,but it decreased by about 0.4% and 0.7%,respectively,when the power was 500 W.

关键词： water slurry slurryability ultrasonic wave viscosity

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