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    A Comparison of Co-Current and Counter-Current Modes of Operation in Urea Prilling Tower

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    Publication date
    2014
    Author
    Rahmanian, Nejat
    Homayoonfard, M.
    Keyword
    Co-current; Counter-current; Prilling; Spray cooling; Urea
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    In this paper, a model for urea prilling tower with co-current flow of cooling air and urea prills (particles) is presented. The process is modelled by simultaneous solution of the differential equations for hydrodynamics, heat and mass transfer between the air and prills. The process variables such as temperature, absolute and relative humidity of air along the height of the tower were obtained from this model. Temperature and moisture distribution of urea prills and their radial and vertical velocities were also calculated. The results of the present model were compared with the counter-current operation model available in the literature. The simulation results show that heat transfer performance for co-current operation is significantly less than that of the counter-current scenario. This is more pronounced for small prills, i.e. 1.0 mm than that of the large prills. The advantage of the model is that it can be used to investigate influence of operating parameters on efficiency of the co-current process. This also helps us to set the process control strategies for design and quality control purposes of the process.
    URI
    http://hdl.handle.net/10454/10772
    Version
    No full-text in the repository
    Citation
    Rahmanian N and Homayoonfard M (2014) A Comparison of Co-Current and Counter-Current Modes of Operation in Urea Prilling Tower. Advanced Materials Research. 917: 199-208.
    Link to publisher’s version
    https://doi.org/10.4028/www.scientific.net/AMR.917.199
    Type
    Article
    Collections
    Engineering and Informatics Publications

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