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Session: System design and optimization II
Session starts: Tuesday 08 October, 09:00
Presentation starts: 09:20
Room: Ruys & Rijckenvorsel Zaal

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Sotirios Karellas (National Technical University of Athens)
Kyriaki Zourou (National Technical University of Athens)
Konstantinos Braimakis (National Technical University of Athens)
Emmanuel Kakaras (National Technical University of Athens)

Abstract:
Container glass manufacturing is a high temperature, energy-intensive process and rejects to the atmosphere high temperature exhaust gases. Waste heat recovery systems can be implemented in the process to utilize the rich energy content of the flue gases from industrial processes and contribute to the increase of the efficiency and also to significant abatement of the emissions. The aim of this paper is to examine and compare two Waste Heat Recovery systems for the glass industry. Namely a water-steam Rankine cycle and an Organic Rankine Cycle (ORC) were designed for the case study of Yioula Glassworks S.A. The temperature of the exhaust gases is 450-500oC leading to a waste heat of around 2,5 ΜWth, while the annual CO2 emissions from natural gas combustion in the furnace reaches the amount of 30467 tonnes per year. With the implementation of an ORC system, it is estimated that more than 600kWe can be recovered. The ORC system has been designed and dimensioned for several working fluids (R245fa, isopentane, neopentane, pentane, toluene, MM, MDM) focusing on the increase of the efficiency and the decrease of the investment costs. The waste heat recovery systems were compared energetically, exergetically and also from an economic perspective. Furthermore, the CO2 avoidance benefits were precisely calculated. Finally an economic feasibility analysis has been conducted in order to evaluate the viability of the implementation of the abovementioned applications. WHR installations in glass industry can reduce significantly the energy consumption operating costs, thus being an attractive investment which enhances the environmental policy of the industry according to the BAT.