Abstract
Monoethanolamine (MEA) scrubbing is an energy intensive process for Carbon Capture and Sequestration (CCS) due to the regeneration of amine in stripping towers at high temperature (100-120 oC) and the subsequent pressurization of CO2 for geologic sequestration. In this paper, we introduce a novel method, reactive hydrothermal liquid phase densification (rHLPD), which is able to solidify (densify) monolithic materials without using high temperature kilns. Then we integrate MEA-based CCS processing and mineral carbonation by using rHLPD technology. This integration is designated as rHLPD-Carbon Sequestration (rHLPD-CS) process. Our results show that the CO2 captured in the MEA-CO2 solution was sequestered by the mineral (wollastonite CaSiO3) carbonation at a low operating temperature (60 oC) and simultaneously monolithic materials with a compressive strength of ~121 MPa were formed. This suggests that the use of rHLPD-CS technology eliminates the energy consumed for CO2-MEA stripping and CO2 compression and also sequesters CO2 to form value-added products, which have a potential to be utilized as construction and infrastructure materials. In contrast to the high energy requirements and excessive greenhouse gas emissions from conventional Portland cement manufacturing, our calculations show that the integration of rHLPD and CS technologies provides a low energy alternative to production of traditional cementitious binding materials.
Highlights
According to conservative predictions by International Conference on Parallel Processing (IPCC) in 2005, about 26.4 Gt CO2 is emitted per year from burning fossil fuels (Metz et al, 2005a)
We introduce a novel concept, i.e., integration of mineral carbonation and amine-based CO2 capture process reactive hydrothermal liquid phase densification (rHLPD) Carbon Capture and Sequestration via rHLPD technology, which is designated as HLPD-carbon sequestration process
As the main goal of this paper is to propose a concept by which monolithic materials can be formed in the MEA-CO2 solution via rHLPD-CS process at a low temperature, many reaction factors, such as the type of natural minerals and/or waste solids, rHLPD Carbon Capture and Sequestration the particle size of minerals/waste solids, the porosity of the compact, the size of compact, and the CO2 concentration, are not optimized
Summary
According to conservative predictions by International Conference on Parallel Processing (IPCC) in 2005, about 26.4 Gt CO2 is emitted per year from burning fossil fuels (Metz et al, 2005a). Researchers have developed a wide variety of CCS techniques, such as amine scrubbing Amine-based scrubbing is the most commercially available technology to capture CO2 from dilute atmospheric pressure gas (Metz et al, 2005b; Rochelle, 2009). The released CO2 is pressurized, transported, and stored/injected underground either in geological formations, oil wells, or retired mines. This method of regenerating MEA, driving off CO2, compressing CO2, and subsequent underground storage is energy intensive. In the case of a conventional coal plant, the estimated energy penalty attribute to CCS operation ranges from 20 to 40% for same output (Rochelle, 2009; Folger, 2010) Approximately 60% of the energy penalty is due to the steam consumption of the stripper, 30% is from the compression of the captured CO2 for transport to the sequestration site, and the rest of 10% is from pumps, blowers, and other (Folger, 2010)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
