Exergetic sustainability analysis of industrial furnace: a case study
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RESEARCH ARTICLE
Exergetic sustainability analysis of industrial furnace: a case study Hemal Chowdhury 1 & Tamal Chowdhury 2 & Nazia Hossain 3 Teuku Meurah Indra Mahlia 6
&
Piyal Chowdhury 4 & Bodius Salam 1 & Sadiq M. Sait 5 &
Received: 2 August 2020 / Accepted: 15 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Industrial furnaces play a significant role in industrial energy consumption and production. Minimizing losses from these furnaces can contribute to industrial sustainability. Exergy being an optimization tool can reduce energy loss and emission from furnaces and contribute to environmental sustainability. Currently, no exergy-based sustainability analysis has been adopted in the literature. In this analysis, a reheater furnace that is fired by natural gas is analyzed in terms of energy and exergy utilization. To address the sustainability of the furnace, several exergy-based sustainability parameters have been used. The overall energy efficiency of the furnace is 93.40%, while exergy efficiency is only 27.37%. From sustainability analysis, it is found that 72.63% of the fuel is diminished from the furnace, and it contributes to a lower sustainability index of 1.38. Higher exergy losses from this furnace positively affect the environment, which is validated from the higher value of the environmental destruction coefficient, the environmental destruction index, and the lower value of the environmental benign index. The value of the environmental destruction coefficient is 3.65, and the value of the environmental benign index is 0.38. Recovering waste energy and optimizing auxiliary equipment will increase the value of sustainability parameters. Keywords Energy . Exergy . Sustainability indicators . Industrial furnace . Steel production . Industrial sustainability
Nomenclatures H Higher heating value (kJ/kg) P0 Atmospheric pressure (Pa) Q The amount of heat transfer (kJ) T0 Ambient temperature (K) I Rate of exergy destruction, kJ/s m Mass flow rate (kg/ s)
Subscripts a Air c Combustor f Fuel ff Fossil fuel F Furnace g Flue gas
Highlights • Energy, exergy, and sustainability are performed on a reheater furnace. • Energy efficiency is 93.40%, and exergy efficiency is only 27.37%. • 72.63% of fuel is wasted, and it causes low sustainability index of 1.38. • Environmental destruction coefficient is 3.65, and environmental benign index is 0.38. Responsible Editor: Philipp Gariguess * Nazia Hossain [email protected] 1
2
Department of Mechanical Engineering, Chittagong University of Engineering & Technology, Kaptai Highway, Raozan, Chattogram, Bangladesh Department of Electrical & Electronic Engineering, Chittagong University of Engineering & Technology, Kaptai Highway, Raozan, Chattogram, Bangladesh
3
School of Engineering, RMIT University, 128 La Trobe Street, Melbourne, VIC 3001, Australia
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Chattogram Collegiate School and College, Ice Factory Road, Chattogram, Bangladesh
5
King Fahd University of Petroleum &Minerals, Dhahran, Saudi Arabia
6
School of In
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