Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Experiments of Bubbling Fluidized Bed using ECVT Measurements

    Access Status
    Fulltext not available
    Authors
    Shah, Milin
    Agrawal, Vaibhav
    Shinde, Yogesh
    Utikar, Ranjeet
    Pareek, Vishnu
    Date
    2017
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Shah, M. and Agrawal, V. and Shinde, Y. and Utikar, R. and Pareek, V. 2017. Experiments of Bubbling Fluidized Bed using ECVT Measurements, in One Curtin International Postgraduate Conference (OCPC), Dec 10-12 2017. Miri, Sarawak, Malaysia: Curtin.
    Source Conference
    One Curtin International Postgraduate Conference
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/75933
    Collection
    • Curtin Research Publications
    Abstract

    Gas-solid bubbling fluidized bed (BFB) is widely applied in industrial processes such as combustion, polymerization, cracking, etc. In BFB, gas-solid flow depends on formation of bubbles and its characteristics such as shape, size and frequency. This study estimates bubble size in a lab-scale BFB (Figure-1a) at three different fluidization velocity using non-invasive measurements from electrical capacitance volume tomography (ECVT). The experimented bed is a cylindrical column of 20 cm diameter and 120 cm height. The measurement section covered by ECVT sensors is 35 cm height and placed at 5 cm above the distributor. Typically, ECVT or any other tomographic technique provides volume fraction distribution in the test section at a resolution that depends primarily on sensor configurations and reconstruction algorithm. In this experiments, the ECVT sensor has 24 electrodes (Figure-1a) which gives 3D image having 20 × 20 × 20 voxels. At such low resolution of the ECVT, estimation of bubble size strongly depends on a threshold solids volume fraction that is used to distinguish the bubble from the dense phase in post-processing of data. Previous studies used a single threshold value to postprocess the captured data. This study finds that use of a single threshold value to post-process all captured data leads to inaccurate estimation of bubble diameter and sometimes can’t even capture smaller bubbles. This has been a major drawback of previous studies on estimation of bubble size using ECVT. In this work, we conducted a series of calibration experiments of static bed with a known size beaker at the centre of the bed. The calibration experiments show that lower values of the threshold underestimate the beaker size, whereas higher value of threshold overestimate the size. It is found that higher value of threshold should be used to capture the small size beakers. The measurements from these calibration experiments are further used to develop an iterative algorithm to determine optimum threshold value for a given ECVT image. The developed algorithm is used to estimate bubble size under dynamic fluidization. It is found that variable thresholding from the iterative algorithm is able to capture bubbles as small as 2.3 cm in 20 cm diameter bed and also gave estimated bubble size consistent with those calculated from empirical correlations with ±20% error.

    Related items

    Showing items related by title, author, creator and subject.

    • Estimation of bubble properties in bubbling fluidized bed using ECVT measurements
      Agrawal, V.; Shinde, Yogesh; Shah, Milin; Utikar, Ranjeet; Pareek, Vishnu; Joshi, J. (2018)
      © 2018 American Chemical Society. In bubbling fluidized beds, important bubble properties can be estimated using electrical capacitance volume tomography (ECVT), resolution of which depends on sensor configuration and ...
    • Numerical and experimental study of hydrodynamics in a compartmented fluidized bed oil palm shell biomass gasifier
      Wee, Siaw Khur (2011)
      Numerical and experimental studies of hydrodynamic parameters of fluidized beds formed by either a single component system or a binary mixture in a pilot plant scale model of a Compartmented Fluidized Bed Gasifier (CFBG) ...
    • Multi-scale modelling of Gibbsite calcination in a fluidized bed reactor
      Amiri, Amirpiran (2013)
      The alumina industry provides the feedstock for aluminium metal production and contributes to around A$6 billion of Australian exports annually. One of the most energy-intensive parts of alumina production, with a strong ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.