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Experimental investigations of water droplet transient phase changes in flue gas flow in the range of temperatures characteristic of condensing economizer technologies

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  • Miliauskas, Gintautas
  • Puida, Egidijus
  • Poškas, Robertas
  • Ragaišis, Valdas
  • Paukštaitis, Linas
  • Jouhara, Hussam
  • Mingilaitė, Laura

Abstract

The heating and phase changes of water droplets in 140 °C air flow humidified up to water vapor volumetric fraction of 0.3 were investigated experimentally in the context of heat recovery from flue gases with condensing economizers. The experiments were performed in experimental set-up, where atmospheric air of certain temperature and humidity passed over a water droplet suspended on thermocouple ball. It was demonstrated that initial temperature of droplet and humidity of gas flow are defining factors in transitional phase changes. However, initial droplet temperature had no effect on the equilibrium evaporation regime. The experiments performed confirmed that humidification of atmospheric air flow causes changes in magnitude of heating and phase change process of water droplets suspended in the air flow. These changes translate into increased temperature of equilibrium evaporation of the droplet, formation of favorable conditions for the condensation regime, and a change in dynamics of the droplet's geometrical parameters in initial stage of phase changes. In additionally humidified air flow, the droplet volume increased by three percent, and evaporation temperature of the droplet increased by 17 °C. Practical recommendations for water injection were produced to ensure optimal heat recovery from wet exhaust gases in a condensing economizer.

Suggested Citation

  • Miliauskas, Gintautas & Puida, Egidijus & Poškas, Robertas & Ragaišis, Valdas & Paukštaitis, Linas & Jouhara, Hussam & Mingilaitė, Laura, 2022. "Experimental investigations of water droplet transient phase changes in flue gas flow in the range of temperatures characteristic of condensing economizer technologies," Energy, Elsevier, vol. 256(C).
    • Handle: RePEc:eee:energy:v:256:y:2022:i:c:s0360544222015468
    DOI: 10.1016/j.energy.2022.124643
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    References listed on IDEAS

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    1. Miliauskas, G. & Maziukienė, M. & Jouhara, H. & Poškas, R., 2019. "Investigation of mass and heat transfer transitional processes of water droplets in wet gas flow in the framework of energy recovery technologies for biofuel combustion and flue gas removal," Energy, Elsevier, vol. 173(C), pages 740-754.
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    5. Block Novelo, David Alejandro & Igie, Uyioghosa & Prakash, Vinod & Szymański, Artur, 2019. "Experimental investigation of gas turbine compressor water injection for NOx emission reductions," Energy, Elsevier, vol. 176(C), pages 235-248.
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    1. Vladimir Dulin & Andrey Cherdantsev & Roman Volkov & Dmitriy Markovich, 2023. "Application of Planar Laser-Induced Fluorescence for Interfacial Transfer Phenomena," Energies, MDPI, vol. 16(4), pages 1-27, February.
    2. Miliauskas, Gintautas & Puida, Egidijus & Poškas, Robertas & Poškas, Povilas & Balčius, Algimantas & Jouhara, Hussam, 2022. "The modeling of transient phase changes of water droplets in flue gas flow in the range of temperatures characteristic of condensing economizer technologies," Energy, Elsevier, vol. 257(C).

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