CO2 capture from coal-fired power plants based on sodium carbonate slurry; a systems feasibility and sensitivity study |
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| Authors: | Hanna Knuutila Hallvard F Svendsen Mikko Anttila |
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| Institution: | 1. Tampere University of Technology, Institute of energy and process technology, PL 589, 33101 Tampere, Finland;2. Department of Chemical Engineering, The Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway;3. Metso Power Oy, Box 109, FIN-33101 Tampere, Finland;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, Shandong, China;2. College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao 266100, Shandong, China;1. Department of Chemical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Membrane Research Center, Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, Iran;3. Research Center for Membrane Separation Processes, Faculty of Chemical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran;1. Cooperative Research Centre for Greenhouse Gas Technologies (CO2CRC), Australia;2. Peter Cook Centre for Carbon Capture and Storage (CCS) Research, Australia;3. Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia;1. Process Systems Engineering Center (PROSPECT), Research Insititute for Sustainable Environment, Faculty of Chemical Engineering, Universiti Teknologi Malaysia, UTM, 81310 Johor Bahru, Malaysia;2. Chemical Engineering Department, Universiti Teknologi Petronas, Bandar Seri Iskandar, 31750 Tronoh, Perak, Malaysia;3. Department of Process Engineering, Razi Petrochemical Company, Tehran, Iran |
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| Abstract: | In this work the feasibility of a CO2 capture system based on sodium carbonate–bicarbonate slurry and its integration with a power plant is studied. The results are compared to monoethanolamine (MEA)-based capture systems. Condensing power plant and combined heat and power plant with CO2 capture is modelled to study the feasibility of combined heat and power plant for CO2 capture.Environmental friendly sodium carbonate would be an interesting chemical for CO2 capture. Sodium carbonate absorbs CO2 forming sodium bicarbonate. The low solubility of sodium bicarbonate is a weak point for the sodium carbonate based liquid systems since it limits the total concentration of carbonate. In this study the formation of solid bicarbonate is allowed, thus forming slurry, which can increase the capacity of the solvent. With this the energy requirement of stripping of the solvent could potentially be around 3.22 MJ/kg of captured CO2 which is significantly lower than with MEA based systems which typically have energy consumption around 3.8 MJ/kg of captured CO2.Combined heat and power plants seem to be attractive for CO2 capture because of the high total energy efficiency of the plants. In a condensing power plant the CO2 capture decreases directly the electricity production whereas in a combined heat and power plant the loss can be divided between district heat and electricity according to demand. |
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