Discharge characteristics of coal and extraction residue from direct coal liquefaction in partial fluidization silo

doi:10.1016/j.cjche.2021.12.002

Chinese Journal of Chemical Engineering ›› 2022, Vol. 52 ›› Issue (12): 78-87.DOI: 10.1016/j.cjche.2021.12.002

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Discharge characteristics of coal and extraction residue from direct coal liquefaction in partial fluidization silo

Zhen Liu^1,2, Haiquan An², Jiansheng Zhang¹

1. Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China;
2. National Institute of Clean-and-Low-Carbon Energy, Beijing 100084, China

Received:2021-07-18 Revised:2021-11-29 Online:2023-01-31 Published:2022-12-28
Contact: Jiansheng Zhang,E-mail:zhang-jsh@tsinghua.edu.cn
Supported by:
The authors would like to express their gratitude to Edit Springs (https://www.editsprings.com/) for the expert linguistic services provided.

Discharge characteristics of coal and extraction residue from direct coal liquefaction in partial fluidization silo

Zhen Liu^1,2, Haiquan An², Jiansheng Zhang¹

1. Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China;
2. National Institute of Clean-and-Low-Carbon Energy, Beijing 100084, China

通讯作者: Jiansheng Zhang,E-mail:zhang-jsh@tsinghua.edu.cn
基金资助:
The authors would like to express their gratitude to Edit Springs (https://www.editsprings.com/) for the expert linguistic services provided.

Abstract

Abstract: Gasification of extraction residue (ER) from direct coal liquefaction with pulverized coal is an efficient way for the utilization of carbonaceous wastes, which improve the overall efficiency of direct coal liquefaction technology. The discharge characteristics of ER mixing with pulverized coal is important paraments for its gasification process, which is seldom studied in the literature. In this study, the discharge characteristics of the pulverized coal (M1) as well as its mixture with ER (M2) were systematically investigated in an atmospheric pressure partial fluidization silo with different fluidization apparent velocity. It was observed that although M2 is a viscous powder with lower flowability than M1, the mass flow rate of M2 is 65% higher than M1 at the 3.7 mm·s^-1 apparent gas velocity. M2 exhibits the properties of Geldart A type powder, which improves the mass flow rate and stability of the discharged material. The mass flow rate of both M1 and M2 first increases and then slowly decreases with the increase of apparent gas velocity of the fluidizing air, which means the discharge process of M1 and M2 can be optimized by the apparent gas velocity.

Key words: Discharge characteristics, Silo, Extraction residue, Direct coal liquefaction, Fluidizing air

摘要： Gasification of extraction residue (ER) from direct coal liquefaction with pulverized coal is an efficient way for the utilization of carbonaceous wastes, which improve the overall efficiency of direct coal liquefaction technology. The discharge characteristics of ER mixing with pulverized coal is important paraments for its gasification process, which is seldom studied in the literature. In this study, the discharge characteristics of the pulverized coal (M1) as well as its mixture with ER (M2) were systematically investigated in an atmospheric pressure partial fluidization silo with different fluidization apparent velocity. It was observed that although M2 is a viscous powder with lower flowability than M1, the mass flow rate of M2 is 65% higher than M1 at the 3.7 mm·s^-1 apparent gas velocity. M2 exhibits the properties of Geldart A type powder, which improves the mass flow rate and stability of the discharged material. The mass flow rate of both M1 and M2 first increases and then slowly decreases with the increase of apparent gas velocity of the fluidizing air, which means the discharge process of M1 and M2 can be optimized by the apparent gas velocity.

关键词: Discharge characteristics, Silo, Extraction residue, Direct coal liquefaction, Fluidizing air

Zhen Liu, Haiquan An, Jiansheng Zhang. Discharge characteristics of coal and extraction residue from direct coal liquefaction in partial fluidization silo[J]. Chinese Journal of Chemical Engineering, 2022, 52(12): 78-87.

Zhen Liu, Haiquan An, Jiansheng Zhang. Discharge characteristics of coal and extraction residue from direct coal liquefaction in partial fluidization silo[J]. 中国化学工程学报, 2022, 52(12): 78-87.

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Discharge characteristics of coal and extraction residue from direct coal liquefaction in partial fluidization silo

Discharge characteristics of coal and extraction residue from direct coal liquefaction in partial fluidization silo

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