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Utilisation of waste heat from exhaust gases of drying process

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Abstract

Nowadays a lot of low-grade heat is wasted from the industry through the off- and flue-gasses with different compositions. These gases provide the sensitive heat with utilisation potential and latent heat with the components for condensation. In this paper, process integration methodology has been applied to the partly condensed streams. A hot composite curve that represents the gas mixture cooling according to equation of state for real gases was drawn to account the gas-liquid equilibrium. According to the pinch analysis methodology, the pinch point was specified and optimal minimal temperature difference was determined. The location of the point where gas and liquid phases can be split for better recuperation of heat energy within heat exchangers is estimated using the developed methodology. The industrial case study of tobacco drying process off-gasses is analysed for heat recovery. The mathematical model was developed by using MathCad software to minimise the total annualised cost using compact plate heat exchangers for waste heat utilisation. The obtained payback period for the required investments is less than six months. The presented method was validated by comparison with industrial test data.

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Authors and Affiliations

  1. National Technical University “Kharkiv Polytechnic Institute”, Kharkiv, 61002, Ukraine

    Olga P. Arsenyeva, Leonid L. Tovazhnyanskyy & Petro O. Kapustenko

  2. Centre for Process Integration and Intensification-CPI2, Faculty of Information Technology, University of Pannonia, Egyetem utca 10, Veszprém, Hungary

    Lidija Čuček

  3. AO SPIVDRUZHNIST-T LLC, Kharkiv, 61002, Ukraine

    Yana A. Savchenko, Sergey K. Kusakov & Oleksandr I. Matsegora

Authors
  1. Olga P. Arsenyeva
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  2. Lidija Čuček
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  3. Leonid L. Tovazhnyanskyy
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  4. Petro O. Kapustenko
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  5. Yana A. Savchenko
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  6. Sergey K. Kusakov
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  7. Oleksandr I. Matsegora
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Correspondence to Petro O. Kapustenko.

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Arsenyeva, O.P., Čuček, L., Tovazhnyanskyy, L.L. et al. Utilisation of waste heat from exhaust gases of drying process. Front. Chem. Sci. Eng. 10, 131–138 (2016). https://doi.org/10.1007/s11705-016-1560-8

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  • DOI: https://doi.org/10.1007/s11705-016-1560-8

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