Gas turbines in district heating combined heat and power systems: influence of performance on heating costs and emissions |
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| Affiliation: | 1. Department of Heat and Power Technology, Chalmers University of Technology, SE-412 96, Göteborg, Sweden;2. Dipartimento di Energetica ‘Sergio Stecco’, Università di Firenze, Via Santa Marta 3, I-50139, Firenze, Italy;1. ICS Industrial Combustion Systems Sp. z o.o., J. Ostroroga 17/1, 60-349 Poznan, Poland;2. Poznan University of Technology, Chair of Thermal Engineering, Piotrowo 3Str., Poznan, Poland;1. Centre for Materials for Electronics Technology (C-MET), Off Pashan road, Panchawati, Pune 411008, India;2. Department of Electrical Engineering, Indian Institute of Technology (IITB), Powai, Mumbai 400076, India;1. University of Freiburg, Chair of Forest Operations, Werthmannstraße 6, 79085 Freiburg, Germany;2. German Research Center for Environmental Health, Research Unit Environmental Simulation, Institute of Biochemical Plant Pathology, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany;3. University of Freiburg, Chair of Forest Utilisation, Werthmannstraße 6, 79085 Freiburg, Germany;1. Refractory and Traditional Ceramics Division, CSIR–Central Glass & Ceramic Research Institute, Kolkata, 700 032, India;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;3. National-provincial Joint Engineering Research Center of High Temperature Materials & Lining Technology, Wuhan University of Science & Technology, Wuhan, 430081, China;1. Department of Agroecology, Aarhus University, Blichers Allé 20, DK-8830 Tjele, Denmark;2. Department of Development and Planning, Aalborg University, Vestre Havnepromenade 9, 9000 Aalborg, Denmark |
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| Abstract: | Much work is currently focussed on identifying economically and environmentally optimal strategies for increasing gas turbine based combined heat and power (CHP). In many such studies, only a few fixed parameters are used to describe the CHP plant. These are typically total and electrical efficiencies, investment and running costs, minimum and maximum acceptable size, and minimum acceptable part-load. However, for gas turbine based systems these characteristics are clearly functions of the operating conditions, especially for part-load operation. This study examines the effects of varying performance of the gas turbine on the overall heat production costs and CO2 emissions of a medium sized community district heating plant. Both single and double-shaft engines are considered in the study. The results show that the assumption of constant efficiencies for all operating conditions leads to an overestimation of the optimal CHP plant size, thereby underestimating the heat production costs and overestimating the CO2 emissions of the plant. The results also show marked differences according to the type of gas turbine used and part-load operating strategy adopted. In particular, the paper discusses the part-load operating difficulties for CHP plants running gas turbines equipped with low emissions burners. |
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