Enhancing gas turbine performance by intake air cooling using an absorption chiller |
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| Institution: | 1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China;2. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore;1. Department of Mechanical Engineering, Nalanda Institute of Technology, Bhubaneswar 831014, India;2. Department of Mechanical Engineering, National Institute of Technology, Jamshedpur, India;1. Department of Aerospace Engineering, Kish International Campus, University of Tehran, Kish 79416-39982, Iran;2. Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran 14115-146, Iran;3. Department of Mechanical Engineering, Pardis Branch, Islamic Azad University, Pardis New City 16555/135, Iran;4. Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada;1. Dipartimento di Ingegneria Industriale e Scienze Matematiche, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy;2. Libera Università di Bolzano, Facoltà di Scienze e Tecnologie, piazza Università, 5, 39100 Bolzano, Italy;1. Energy Systems Improvement Laboratory (ESIL), School of Mechanical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 16844, Iran;2. Mechanical and Energy Engineering Department, Shahid Beheshti University, Tehran, Iran;3. School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran |
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| Abstract: | The performance of gas turbines, operated either as a simple cycle or a combined cycle, is critically constrained by the prevailing ambient temperature, particularly in arid and tropical climates. This paper investigates the option of cooling the intake air to the compressor of the gas-turbine system using an absorption chiller in order to increase the gas turbine capacity. High-temperature waste heat from the exhaust gas may be utilized to produce steam in a recovery boiler. Part of the steam produced could then be used to drive a lithium-bromide double-effect absorption chiller which in turn could cool the incoming air. An analysis carried out by taking the weather data of Bangkok (Thailand) indicates that reducing the temperature from ambient condition to 15°C could help to increase the instantaneous power output between 8 and 13%. As an outcome, as much as 11% additional electricity could be generated from the same gas turbine power plant.A simple economic assessment indicates that the proposed scheme will require a minimal investment as compared to the commissioning cost of a new gas turbine unit to meet the corresponding capacity increment. The latter will need nearly four times higher initial cost than the amount estimated for the proposed scheme. Thus, implementation of such a system would significantly abate the negative impact of the ambient temperature, while providing an economically and environmentally attractive option for energy producers in most developing nations of the world which are located in arid and tropical zones. |
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