Energy Consumption and Net CO2 Sequestration of Aqueous Mineral Carbonation
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- 作者：Wouter J. J. Huijgen ; Gerrit Jan Ruijg ; Rob N. J. Comans ; Geert-Jan Witkamp
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2006
- 出版时间：December 20, 2006
- 年：2006
- 卷：45
- 期：26
- 页码：9184 - 9194
- 全文大小：333K
- 年卷期：v.45,no.26(December 20, 2006)
- ISSN：1520-5045
文摘
Aqueous mineral carbonation is a potentially attractive sequestration technology to reduce CO2 emissions.The energy consumption of this technology, however, reduces the net amount of CO2 sequestered. Therefore,the energetic CO2 sequestration efficiency of aqueous mineral carbonation was studied in dependence ofvarious process variables using either wollastonite (CaSiO3) or steel slag as feedstock. For wollastonite, themaximum energetic CO2 sequestration efficiency within the ranges of process conditions studied was 75% at200 
C, 20 bar CO2, and a particle size of <38 
m. The main energy-consuming process steps were thegrinding of the feedstock and the compression of the CO2 feed. At these process conditions, a significantlylower efficiency was determined for steel slag (69%), mainly because of the lower Ca content of the feedstock.The CO2 sequestration efficiency might be improved substantially for both types of feedstock by, e.g., reducingthe amount of process water applied and further grinding of the feedstock. The calculated energetic efficiencieswarrant a further assessment of the (energetic) feasibility of CO2 sequestration by aqueous mineral carbonationon the basis of a pilot-scale process.
C, 20 bar CO2, and a particle size of <38 m. The main energy-consuming process steps were thegrinding of the feedstock and the compression of the CO2 feed. At these process conditions, a significantlylower efficiency was determined for steel slag (69%), mainly because of the lower Ca content of the feedstock.The CO2 sequestration efficiency might be improved substantially for both types of feedstock by, e.g., reducingthe amount of process water applied and further grinding of the feedstock. The calculated energetic efficiencieswarrant a further assessment of the (energetic) feasibility of CO2 sequestration by aqueous mineral carbonationon the basis of a pilot-scale process.