View in EDS

MP-PIC modeling of CFB risers with homogeneous and heterogeneous drag models.

Saved in:
Bibliographic Details
Title: MP-PIC modeling of CFB risers with homogeneous and heterogeneous drag models.
Authors: Xie, Jun1, Zhong, Wenqi1 wqzhong@seu.edu.cn, Yu, Aibing1
Source: Advanced Powder Technology. Nov2018, Vol. 29 Issue 11, p2859-2871. 13p.
Subjects: Circulating fluidized bed combustion, Combustion, Fluidization, Heterogeneous catalysis, Drag (Aerodynamics)
Abstract: Graphical abstract Highlights • The gas-solid flows of two CFB risers using MP-PIC method were simulated. • Different homogeneous and heterogeneous drag models were verified. • The effects of the three important simulation parameters were investigated. • EMMS-QL drag force model is most suitable for the typical Geldart A particles. • Wenyu-Ergun drag force model is recommended for typical Geldart B particles. Abstract In this paper, the MP-PIC (multiphase particle-in-cell) approach is used for three-dimensional (3D) modeling of the gas-solid flows in two types of circulating fluidized bed (CFB) risers with Geldart group A and B particles by incorporating the homogeneous and heterogeneous drag force models in the MP-PIC method, respectively. First, the effects of the three important simulation parameters, namely, the grid cell number, numerical particle-parcel size and time step, are investigated. Having determined the appropriate values for the three parameters, the hydrodynamic characteristics predicted by different drag force models are rigorously analyzed. The homogeneous drag models considered are the six models, the Wen-Yu, Wenyu-Ergun, Syamlal-O’Brien, Gidaspow, HKL, and BVK models, while the four heterogeneous models considered are Sarkar and EMMS-based models (EMMS-Yang, EMMS-Matrix and EMMS-QL). For the riser 1 with the Geldart A particles, all the six homogeneous models predict extremely high solid fluxes and inconsistent void fraction distributions compared with experimental results. The heterogeneous Sarkar and EMMS-based models can effectively improve the simulation accuracy and predict a typical core-annulus flow structure. The lately-developed EMMS-QL model produces the most accurate solid flux. For the riser 2 with the Geldart B particles, both the heterogeneous and homogeneous drag force models can predict a reasonable flow structure. Further, there are no significant differences in the void fraction and velocity profiles due to the choice of a drag force model over the other. These drag force models also successfully capture the meso-scale local particle clusters. Of these drag-force models, the Wenyu-Ergun drag-forec model predicts comparatively accurate solid flux. Generally, MP-PIC combined with heterogeneous Sarkar and EMMS-based drag force models reasonably improve the simulation accuracy for the Geldart A particles, while these heterogeneous models have no superiority over the homogeneous drag models for the Geldart B particles. [ABSTRACT FROM AUTHOR]
Copyright of Advanced Powder Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 131664115
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: MP-PIC modeling of CFB risers with homogeneous and heterogeneous drag models.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Xie%2C+Jun%22">Xie, Jun</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhong%2C+Wenqi%22">Zhong, Wenqi</searchLink><relatesTo>1</relatesTo><i> wqzhong@seu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yu%2C+Aibing%22">Yu, Aibing</searchLink><relatesTo>1</relatesTo>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Advanced+Powder+Technology%22">Advanced Powder Technology</searchLink>. Nov2018, Vol. 29 Issue 11, p2859-2871. 13p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Circulating+fluidized+bed+combustion%22">Circulating fluidized bed combustion</searchLink><br /><searchLink fieldCode="DE" term="%22Combustion%22">Combustion</searchLink><br /><searchLink fieldCode="DE" term="%22Fluidization%22">Fluidization</searchLink><br /><searchLink fieldCode="DE" term="%22Heterogeneous+catalysis%22">Heterogeneous catalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Drag+%28Aerodynamics%29%22">Drag (Aerodynamics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Graphical abstract Highlights • The gas-solid flows of two CFB risers using MP-PIC method were simulated. • Different homogeneous and heterogeneous drag models were verified. • The effects of the three important simulation parameters were investigated. • EMMS-QL drag force model is most suitable for the typical Geldart A particles. • Wenyu-Ergun drag force model is recommended for typical Geldart B particles. Abstract In this paper, the MP-PIC (multiphase particle-in-cell) approach is used for three-dimensional (3D) modeling of the gas-solid flows in two types of circulating fluidized bed (CFB) risers with Geldart group A and B particles by incorporating the homogeneous and heterogeneous drag force models in the MP-PIC method, respectively. First, the effects of the three important simulation parameters, namely, the grid cell number, numerical particle-parcel size and time step, are investigated. Having determined the appropriate values for the three parameters, the hydrodynamic characteristics predicted by different drag force models are rigorously analyzed. The homogeneous drag models considered are the six models, the Wen-Yu, Wenyu-Ergun, Syamlal-O’Brien, Gidaspow, HKL, and BVK models, while the four heterogeneous models considered are Sarkar and EMMS-based models (EMMS-Yang, EMMS-Matrix and EMMS-QL). For the riser 1 with the Geldart A particles, all the six homogeneous models predict extremely high solid fluxes and inconsistent void fraction distributions compared with experimental results. The heterogeneous Sarkar and EMMS-based models can effectively improve the simulation accuracy and predict a typical core-annulus flow structure. The lately-developed EMMS-QL model produces the most accurate solid flux. For the riser 2 with the Geldart B particles, both the heterogeneous and homogeneous drag force models can predict a reasonable flow structure. Further, there are no significant differences in the void fraction and velocity profiles due to the choice of a drag force model over the other. These drag force models also successfully capture the meso-scale local particle clusters. Of these drag-force models, the Wenyu-Ergun drag-forec model predicts comparatively accurate solid flux. Generally, MP-PIC combined with heterogeneous Sarkar and EMMS-based drag force models reasonably improve the simulation accuracy for the Geldart A particles, while these heterogeneous models have no superiority over the homogeneous drag models for the Geldart B particles. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Advanced Powder Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=131664115
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.apt.2018.08.007
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 2859
    Subjects:
      – SubjectFull: Circulating fluidized bed combustion
        Type: general
      – SubjectFull: Combustion
        Type: general
      – SubjectFull: Fluidization
        Type: general
      – SubjectFull: Heterogeneous catalysis
        Type: general
      – SubjectFull: Drag (Aerodynamics)
        Type: general
    Titles:
      – TitleFull: MP-PIC modeling of CFB risers with homogeneous and heterogeneous drag models.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Xie, Jun
      – PersonEntity:
          Name:
            NameFull: Zhong, Wenqi
      – PersonEntity:
          Name:
            NameFull: Yu, Aibing
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 11
              Text: Nov2018
              Type: published
              Y: 2018
          Identifiers:
            – Type: issn-print
              Value: 09218831
          Numbering:
            – Type: volume
              Value: 29
            – Type: issue
              Value: 11
          Titles:
            – TitleFull: Advanced Powder Technology
              Type: main
ResultId 1