An overview of solid–liquid separation of residues from coal liquefaction processes

Khare, Sameer; Dell’Amico, Mark

doi:10.1002/cjce.21647

Cited by 20 publications

(15 citation statements)

References 16 publications

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“…Slurry is injected tangentially into the cylindrical zone, which generates a spiral flow enabling particle‐liquid separation due to centrifugal force . Hydrocyclones are widely used in a number of areas including chemical, mineral, petrochemical, textile, metallurgical, and biological applications . Recently, researchers have used the hydrocyclone to separate gas and particles in fluid control systems .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2] Hydrocyclones are widely used in a number of areas including chemical, mineral, petrochemical, textile, metallurgical, and biological applications. [3][4] Recently, researchers have used the hydrocyclone to separate gas and particles in fluid control systems. [5][6] Because of the frequent flow operation in the fluid control systems, the transitional behaviours inside a hydrocylone directly affect the flow splits and separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Simulation and experiment on transitional behaviours of multiphase flow in a hydrocyclone

2015

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This paper presents an investigation of transitional behaviours of multiphase flow in a hydrocyclone. The experiment and simulation results reveal the existence of two stages of the transition period of gas‐liquid flow. The numerical model combined with the large eddy simulation model (LES), the volume of fluid model (VOF), and the Lagrangian discrete phase model (DPM) approach is used to simulate the multiphase flow in a hydrocyclone. The applicability of this approach with a 2‐step simulation strategy has been verified by the close agreement between the calculated and measured flow fields. Particle motion upon entering the hydrocyclone indicates the separation mechanism of a hydrocyclone. Moreover, a parameter of the hydrocyclone, separation cycle time Tc, is proposed to describe the dynamic characteristics of the particle residence time.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation and experiment on transitional behaviours of multiphase flow in a hydrocyclone

2015

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“…Khare and Dell' Amico [2] have previously reviewed processes for solid-liquid separation of DLR, a step which usually precedes conversion. Khare and Dell' Amico [2] have previously reviewed processes for solid-liquid separation of DLR, a step which usually precedes conversion.…”

Section: Introductionmentioning

confidence: 99%

“…[2] Commercial-scale production of synthetic fuel by DCL (first-stage 24,000 bbl/day) is underway in Inner Mongolia, China, [3] and is the only example of a modern coal liquefaction plant. Improvements and the extent of development of residue solid-liquid separation in DCL processes are described in detail in Khare and Dell'Amico.…”

Section: Introductionmentioning

confidence: 99%

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An overview of conversion of residues from coal liquefaction processes

Khare

Dell’Amico

2013

Can J Chem Eng

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Direct coal liquefaction (DCL) is a process for converting coal to synthetic oils, which can be refined to make transportation fuels. Residue from this process contains inorganic material such as mineral matter originating from the coal and catalysts, and organic matter such as unconverted coal, heavy oils, pre-asphaltenes and asphaltenes. The conversion of these DCL residues to lighter, high-value products is an important step in helping to make this technology both commercially viable and environmentally acceptable. This paper provides an overview of the physico-chemical characteristics and processing options available for coal liquefaction residues and compares and contrasts them to those of petroleum residues. Residue properties vary considerably, since they are highly dependent on feed coal, process configuration and operating conditions. Determination of composition and structural parameters of products derived from residue conversion can help determine their stability, coking and solvent hydrogen donating ability. Thermal conversion processes such as visbreaking and gasification offer the greatest promise for handling these heavy materials. The conversion chemistry, reactivity and kinetics of residue gasification are not well-understood but are important in optimising hydrogen production for the process. The literature has been comprehensively reviewed to provide characteristics and properties of residues and their potential for conversion. In addition, the potential for producing high-value carbon products from residues is briefly discussed.

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A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

Guo

Huang

Gong

et al. 2019

Asia-Pacific J Chem Eng

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In this study, the rapid pyrolysis chars of Hami bituminous coal and its liquefaction residue were prepared using a high-frequency furnace. A thermogravimetric analyzer was used to investigate the gasification reactivity and determine the mixing ratio of coal and its liquefaction residue. In addition, a scanning electron microscope, a physisorption analyzer, and a laser raman spectrometer were used to characterize the physicochemical properties of samples. Furthermore, kinetics analysis using the isoconversional method was conducted. The results showed that the gasification reactivity was affected by gasification temperature, pore structure, and carbon structure. When the gasification temperature increased to 1300°C, the gasification reactivity of the liquefaction residue char was close to that of coal char. From the gasification reactivity point of view, the liquefaction residue could be utilized as a raw material in entrained-flow gasification. The mixing ratio of the raw coal to the liquefaction residue was preferably 2:1. The research on activation energy showed that the gasification process belonged to pore diffusion control in the range of temperatures investigated. Specifically, there was a synergistic effect between the coal char and the liquefaction residue char in co-gasification, which was beneficial to the gasification reaction. study on high-temperature cogasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue. Asia-Pac J Chem Eng. 2020;15:e2376. https://doi.

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An overview of solid–liquid separation of residues from coal liquefaction processes

Cited by 20 publications

References 16 publications

Simulation and experiment on transitional behaviours of multiphase flow in a hydrocyclone

Simulation and experiment on transitional behaviours of multiphase flow in a hydrocyclone

An overview of conversion of residues from coal liquefaction processes

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

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