Utilisation of waste heat from exhaust gases of drying process

doi:10.1007/s11705-016-1560-8

Front. Chem. Sci. Eng.

2016, Vol. 10

Issue (1) : 131-138 https://doi.org/10.1007/s11705-016-1560-8

RESEARCH ARTICLE

Utilisation of waste heat from exhaust gases of drying process

Olga P. Arsenyeva¹, Lidija Čuček², Leonid L. Tovazhnyanskyy¹, Petro O. Kapustenko¹(

), Yana A. Savchenko³, Sergey K. Kusakov³, Oleksandr I. Matsegora³

¹. National Technical University “Kharkiv Polytechnic Institute”, Kharkiv 61002, Ukraine
². Centre for Process Integration and Intensification-CPI², Faculty of Information Technology, University of Pannonia, Egyetem utca 10, Veszprém, Hungary
³. AO SPIVDRUZHNIST-T LLC, Kharkiv 61002, Ukraine

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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.

Keywords exhaust gas waste heat process integration plate heat exchanger

Corresponding Author(s): Petro O. Kapustenko

Online First Date: 19 February 2016 Issue Date: 29 February 2016

Cite this article:

Olga P. Arsenyeva,Lidija Čuček,Leonid L. Tovazhnyanskyy, et al. Utilisation of waste heat from exhaust gases of drying process[J]. Front. Chem. Sci. Eng., 2016, 10(1): 131-138.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-016-1560-8
https://academic.hep.com.cn/fcse/EN/Y2016/V10/I1/131

Fig.1 The examples of phase heat capacity flowrate variation with the temperature (a) gas phase CP _G; (b) liquid phase CP _L; (c) total CP.

Tab.1 Stream data of the existing process

Fig.2 The composite curves for the existing process of tobacco drying section and radiator heating circuit

Fig.3 The composite curves for the proposed process with D T _min= 1 °C

Fig.4 The grid diagram of integrated process with D T _min= 18 °C

Tab.2 The results of PHE calculations for different D T _minand exhaust gas stream splitting

Fig.5 The influence of D T _minon economic characteristics of exhaust gas heat utilisation (a) annual operational cost OPC, €/year; (b) annualised investment cost ACC, €/year; (c) total annual cost TAC, €/year

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