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Unraveling particle-scale effects in lignite drying: insights from single particles and particle groups.

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Title: Unraveling particle-scale effects in lignite drying: insights from single particles and particle groups.
Authors: Cheng, Cheng1 (AUTHOR), Gao, Mingqiang1 (AUTHOR) gaomq@cumt.edu.cn, Miao, Zhenyong1,2 (AUTHOR) zymiao@cumt.edu.cn, Zhou, Yufang1 (AUTHOR), Wan, Keji2 (AUTHOR), He, Qiongqiong2 (AUTHOR)
Source: International Journal of Coal Preparation & Utilization. 2026, Vol. 46 Issue 6, p1749-1765. 17p.
Subject Terms: *Size reduction of materials, *Heat transfer, *Vaporization, *Activation energy, *Drying apparatus, *Mass transfer, *Computed tomography
Abstract: The drying efficiency of lignite is markedly affected by its particle size. In this regard, the present study explores the drying characteristics of single particles and bed-particle groups. The heat flow channels of the bed-particle groups were modeled using 3D computed tomography to reveal the heat and moisture transfer mechanisms within these groups and to understand the effect of particle scale differences on lignite drying. As the particles became smaller, the trend of the increasing drying rate became more pronounced for single particles. As the particle scale decreased, the relation between drying activation energy (Ea) and particle size followed the equation Ea = 7.665 − 4.384×ln(P + 2.029), whereby particle size reduction effectively promoted lignite drying. However, in the bed-particle-group drying, the drying rate did not incrementally increase as the particle size decreased; however, the average drying rate decreased when the particle size was reduced to 0.5–1 mm. Despite the bed of large particles having numerous heat flow channels and low airflow resistance, it exhibited insufficient gas-solid contact for drying. Although small particles exhibited satisfactory gas-solid contact, they had fewer heat flow channels between particles, resulting in a slower bed heat transfer rate. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194221861
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Unraveling particle-scale effects in lignite drying: insights from single particles and particle groups.
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  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Cheng%2C+Cheng%22">Cheng, Cheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gao%2C+Mingqiang%22">Gao, Mingqiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> gaomq@cumt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Miao%2C+Zhenyong%22">Miao, Zhenyong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> zymiao@cumt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhou%2C+Yufang%22">Zhou, Yufang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wan%2C+Keji%22">Wan, Keji</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22He%2C+Qiongqiong%22">He, Qiongqiong</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Coal+Preparation+%26+Utilization%22">International Journal of Coal Preparation & Utilization</searchLink>. 2026, Vol. 46 Issue 6, p1749-1765. 17p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Size+reduction+of+materials%22">Size reduction of materials</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink><br />*<searchLink fieldCode="DE" term="%22Vaporization%22">Vaporization</searchLink><br />*<searchLink fieldCode="DE" term="%22Activation+energy%22">Activation energy</searchLink><br />*<searchLink fieldCode="DE" term="%22Drying+apparatus%22">Drying apparatus</searchLink><br />*<searchLink fieldCode="DE" term="%22Mass+transfer%22">Mass transfer</searchLink><br />*<searchLink fieldCode="DE" term="%22Computed+tomography%22">Computed tomography</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The drying efficiency of lignite is markedly affected by its particle size. In this regard, the present study explores the drying characteristics of single particles and bed-particle groups. The heat flow channels of the bed-particle groups were modeled using 3D computed tomography to reveal the heat and moisture transfer mechanisms within these groups and to understand the effect of particle scale differences on lignite drying. As the particles became smaller, the trend of the increasing drying rate became more pronounced for single particles. As the particle scale decreased, the relation between drying activation energy (Ea) and particle size followed the equation Ea = 7.665 − 4.384×ln(P + 2.029), whereby particle size reduction effectively promoted lignite drying. However, in the bed-particle-group drying, the drying rate did not incrementally increase as the particle size decreased; however, the average drying rate decreased when the particle size was reduced to 0.5–1 mm. Despite the bed of large particles having numerous heat flow channels and low airflow resistance, it exhibited insufficient gas-solid contact for drying. Although small particles exhibited satisfactory gas-solid contact, they had fewer heat flow channels between particles, resulting in a slower bed heat transfer rate. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/19392699.2025.2511014
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 1749
    Subjects:
      – SubjectFull: Size reduction of materials
        Type: general
      – SubjectFull: Heat transfer
        Type: general
      – SubjectFull: Vaporization
        Type: general
      – SubjectFull: Activation energy
        Type: general
      – SubjectFull: Drying apparatus
        Type: general
      – SubjectFull: Mass transfer
        Type: general
      – SubjectFull: Computed tomography
        Type: general
    Titles:
      – TitleFull: Unraveling particle-scale effects in lignite drying: insights from single particles and particle groups.
        Type: main
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          Name:
            NameFull: Cheng, Cheng
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          Name:
            NameFull: Gao, Mingqiang
      – PersonEntity:
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            NameFull: Miao, Zhenyong
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            NameFull: Zhou, Yufang
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            NameFull: Wan, Keji
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            NameFull: He, Qiongqiong
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            – D: 01
              M: 06
              Text: 2026
              Type: published
              Y: 2026
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              Value: 46
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              Value: 6
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            – TitleFull: International Journal of Coal Preparation & Utilization
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