Title: Exergy analysis and exergetic sustainability index of package boiler

Authors: Serigianto Serigianto; Muhammad Djoni Bustan; Sri Haryati

Addresses: Chemical Engineering Graduate Program, Sriwijaya University, Jalan Padang Selasa, 542 Bukit Besar, Palembang 30139, Indonesia ' Chemical Engineering Graduate Program, Sriwijaya University, Jalan Padang Selasa, 542 Bukit Besar, Palembang 30139, Indonesia ' Chemical Engineering Graduate Program, Sriwijaya University, Jalan Padang Selasa, 542 Bukit Besar, Palembang 30139, Indonesia

Abstract: Energy utilisation in the fertiliser industry can be improved by conserving energy. One way to achieve this is by modifying the operating conditions of the package boiler. Research shows that 94.3% of the total exergy destruction of the package boiler is obtained from the evaporator component with a value of 2.7 × 10⁸ kJ/hour. The modification of evaporator operating conditions involves lowering the inlet temperature of boiler feed water (BFW) by ΔT (196°C-116°C). This decrease in BFW temperature increases the latent heat required and reduces the convection heat carried by the flue gas to produce superheated steam. The optimum temperature of BFW is 161°C which results in a reduction in exergy destruction of 6.2 × 10⁶ kJ/hour and produces a difference in loss costs based on actual data (196°C) of Rp 1,370,354,743/hour. The exergetic sustainability index (ESI) obtained was 0.918.

Keywords: exergy analysis; exergy destruction; exergoeconomic analysis; package boiler.

DOI: 10.1504/IJEX.2024.138750

International Journal of Exergy, 2024 Vol.44 No.1, pp.77 - 88

Received: 30 Nov 2023
Accepted: 31 Dec 2023
Published online: 29 May 2024 *

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