Steam demand reduction of water–gas shift reaction in IGCC power plants with pre-combustion CO2 capture |
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| Authors: | MC Carbo J Boon D Jansen HAJ van Dijk JW Dijkstra RW van den Brink AHM Verkooijen |
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| Institution: | 1. Hydrogen and Clean Fossil Fuels Department, Energy Research Centre of the Netherlands (ECN), P.O. Box 1, 1755 ZG Petten, The Netherlands;2. Process and Energy Department, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, P.O. Box 5, 2600 AA Delft, The Netherlands;1. School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, South Korea;2. Engineering Development Research Center, Seoul National University, Seoul 151-744, South Korea;3. Chemical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia;1. Institute of Combustion and Thermal Systems, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;2. Beijing Key Laboratory of Powertrain for New Energy Vehicle, Beijing Jiaotong University, Beijing 100044, China;3. Department of Mechanical and Electrical Engineering, Haibin College of Beijing Jiaotong University, Huanghua 061199, Hebei Province, China;1. Energy research Centre of the Netherlands (ECN), Sustainable Process Technology, Westerduinweg 3, 1755 LE Petten, The Netherlands;2. Delft University of Technology, Catalysis Engineering, Julianalaan 136, 2628 BL Delft, The Netherlands;3. Vattenfall, R&D projects, Hoekenrode 8, 1102 BR Amsterdam, The Netherlands |
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| Abstract: | This paper presents the results of system assessments that were conducted to compare conventional and advanced water–gas shift reactor sections. The latter are specifically tailored for Integrated Gasification Combined Cycles (IGCC) power plants with pre-combustion CO2 capture. The advanced shift reactor section comprises four staged reactors with distributed feeds of synthesis gas and quench water in between the reactors. Conventional shift reactor sections consist of two sequential reactors with intermediate cooling, where the entire synthesis gas stream passes both reactors.The advanced shift reactor section reduces the steam requirement of the water–gas shift reaction up to 70% in comparison with conventional configurations, at carbon dioxide capture ratios of approximately 85%. This reduction allows for lower electric efficiency penalties, thus higher net electric outputs for IGCC power plants with CO2 capture. For each case, the CO2 capture ratio was optimised for the lowest specific lost work per amount of captured CO2. Both the number of reactors and the total catalyst volume are higher for the advanced shift reactor sections, resulting in increased capital expenses. In case of four staged reactors, the additional expenses are expected to be outperformed by the increased revenues associated with the higher net electric output. |
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