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Hydrodynamic studies of CFBC boiler with three types of air distributor nozzles: experimental and CFD analysis

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Abstract

This paper presents the elaborated hydrodynamics studies of three types of air nozzles of CFBC boilers, types of air nozzles are bubble cap, arrow head and modified arrow head nozzles, and all these air nozzles are arranged in a 3 × 3 array and manufactured using FDM 3D print. The array of air nozzle is mounted onto the 200 × 200 × 2000-mm-transparent full-loop CFBC test rig. The different fluidization regimes for three types of air nozzles are studied. This research study is the sequel of the previous experiments where we had experimented different particle sizes, different bed heights and different velocities for a bubble cap nozzle, to avoid complication and number of experiments involving various velocities, bed heights, particle sizes and nozzles, and in this experiment we had kept bed height, particle size and velocity as fixed and nozzle geometry as variables. The bed height is kept as 200 mm from the distributor plate, particle size is taken as 200 μm and velocity as 1 m/s. The parameters considered for this include the velocity, pressure drop and the regimes of fluidization. The hydrodynamic study is conducted both experimentally and computationally; the results are then compared to find out the most optimal design of nozzle among the three. Based on experimental and computation results, the modified arrow head nozzle is a good hydrodynamic stable air nozzle to be used in the CFBC boiler, though its pressure drop is more.

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Funding

The authors did not receive support from any organization for the submitted work. No funding was received to assist with the preparation of this manuscript. No funding was received for conducting this study. No funds, grants, or other support was received.

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Authors and Affiliations

  1. Adjunct Faculty, Department of Mechanical Engineering, National Engineering College, Kovilpatti, Tamil Nadu, 628 503, India

    M. Vivekanandan

  2. Department of Energy and Environment, National Institute of Technology Trichy, Thuvakudi, Tiruchirappalli, 620 015, India

    M. Premalatha

  3. Department of Chemical Engineering, National Institute of Technology Trichy, Thuvakudi, Tiruchirappalli, 620 015, India

    N. Anantharaman

  4. Department of Mechanical Engineering, Saveetha School of Engineering, SIMATS, Chennai, Tamil Nadu, 602105, India

    R. Venkatesh

  5. Department of Mechanical Engineering, K. Ramakrishnan College of Technology, Trichy, Tamil Nadu, 621112, India

    V. Vijayan

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  1. M. Vivekanandan
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  2. M. Premalatha
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  4. R. Venkatesh
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by [Vivekanandan M], [Premalatha M], [Anantharaman N], [Venkatesh R] and [Vijayan V]. The first draft of the manuscript was written by [Vivekanandan M], and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to R. Venkatesh.

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Competing interests

The authors have no relevant financial or non-financial interests to disclose. The authors have no competing interests to declare that are relevant to the content of this article. All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript. The authors have no financial or proprietary interests in any material discussed in this article.

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This is an observational study. Research Ethics Committee has confirmed that no ethical approval is required.

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Vivekanandan, M., Premalatha, M., Anantharaman, N. et al. Hydrodynamic studies of CFBC boiler with three types of air distributor nozzles: experimental and CFD analysis. J Therm Anal Calorim 148, 405–415 (2023). https://doi.org/10.1007/s10973-022-11682-0

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  • DOI: https://doi.org/10.1007/s10973-022-11682-0

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