Chilled ammonia process for CO2 capture |
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| Authors: | Victor Darde Kaj Thomsen Willy JM van Well Erling H Stenby |
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| Institution: | 1. Techical University of Denmark (DTU), IVC SEP, Chemical Engineering, Building 229, 2800 Kgs, Lyngby, Denmark;2. DONG EnergyPower, Chemical Engineering, Kraftværksvej 53, 7000 Fredericia, Denmark;1. CSIRO Energy Technology, 10 Murray Dwyer Circuit, Mayfield West, NSW 2304, Australia;2. Department of Thermal Engineering, Tsinghua University, Beijing, 100084, P.R. China;3. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Zheda Road 38, Hangzhou, 310027, P. R. China;4. CSIRO Materials Science and Engineering, Bayview Ave, Clayton, VIC 3168, Australia;1. Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China;2. Ningbo RK Solar Tech. Ltd., 315200 Ningbo, China;3. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), Ministry of Education of China, Tianjin 300072, China;4. Department of Microelectronic Science and Engineering, Ningbo University, Ningbo 315211, China;5. Department of Chemical Engineering, Royal Institute of Technology, SE 100 44 Stockholm, Sweden |
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| Abstract: | The chilled ammonia process absorbs the CO2 at low temperature (2–10 °C). The heat of absorption of carbon dioxide by ammonia is significantly lower than for amines. In addition, degradation problems can be avoided and a high carbon dioxide capacity is achieved. Hence, this process shows good perspectives for decreasing the heat requirement. However, a scientific understanding of the processes is required. The thermodynamic properties of the NH3–CO2–H2O system were described using the extended UNIQUAC electrolyte model developed by Thomsen and Rasmussen in a temperature range from 0 to 110 °C and pressure up to 100 bars. The results show that solid phases consisting of ammonium carbonate and bicarbonate are formed in the absorber. The heat requirements in the absorber and in the desorber have been studied. The enthalpy calculations show that a heat requirement for the desorber lower than 2 GJ/ton CO2 can be reached. |
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