China State Key Laboratory of Coal Based Clean Energy

Beijing, China

China State Key Laboratory of Coal Based Clean Energy

Beijing, China
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Wang X.,China Huaneng Group Clean Energy Research Institute | Wang X.,University of Nottingham | Maroto-Valer M.,Heriot - Watt University | Shiwang G.,China State Key Laboratory of Coal Based Clean Energy | Shisen X.,China Huaneng Group Clean Energy Research Institute
Energy Procedia | Year: 2013

Carbon dioxide capture and storage by mineralization (CCSM), also known as ex-situ mineralization, is an important technology for industrial CCS. The feedstocks for CCSM can not only be Mg/Ca-silicate minerals, but can also include waste materials from industries, such as steel slags and waste cement. Aqueous ammonia capture is preferred for industrial CCS, since industrial emissions present high CO2 concentrations (around 25 vol.%) and more impurities (SO2/NOx) than that from power plants. Aqueous ammonia CO2 capture integrated with ex-situ mineralisation avoids stripping CO2 as pure gas from absorbents and compression of CO2, and therefore reduces the high energy consumption of capture. In this study, optimization experiments were conducted on this process. The dissolution efficiency of Mg from serpentine using 2.8 M NH4HSO4 at 100 g/l solid to liquid ratio for 1 h was around 80 %. The decrease in dissolution efficiencies is because of the Si passive layer on the surface of serpentine particles. The molar ratio of Mg: NH4+ salts: NH3 is the key factor controlling carbonation efficiency, and when using the molar ratio of Mg: NH4+ salts: NH3 is 1:1.5:2, the carbonation efficiency was 96 %.


Wang X.,China Huaneng Group Clean Energy Research Institute | Wang X.,University of Nottingham | Maroto-Valer M.,Heriot - Watt University | Shiwang G.,China State Key Laboratory of Coal Based Clean Energy | Shisen X.,China Huaneng Group Clean Energy Research Institute
Energy Procedia | Year: 2013

Carbon dioxide capture and storage by mineralization (CCSM), also known as ex-situ mineralization, is an important technology for industrial CCS. The integration of CO2 capture using aqueous ammonia with ex-situ mineralisation avoids stripping CO2 as pure gas from absorbents and compression of c, and therefore, potentially reduces the high energy consumption of capture. It was found that the solid liquid ratio has a large influence on the energy consumption cost. Therefore, in this study, two different solid liquid ratios values were used for evaluating the OPEX in terms of energy consumption, chemical costs and feedstock cost. The results show that the total cost to sequestering 1 t CO2 is 100 US$ and 119 US$ for the 50 and at 300 g/l case, respectivelt. Using low solid to liquid ratio (50 g/l) resulted in large streams in the process, and thus resulting in a high energy consumption. However, high solid to liquid ratio (300 g/l) decreases the dissolution and carbonation efficiencies.

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