Process Modeling and Optimization of Postcombustion Carbon Capture Using a N2-Selective Membrane
Abstract/Contents
- Abstract
- Chemical absorption is presently considered to be the most promising method for post-combustion CO2 capture. However, due to its disadvantages of large footprint, environmental unfriendliness as well as high-energy consumption for regeneration, a membrane separation approach is introduced as an alternative technology for CO2-capture because the footprint of the process is much smaller than a chemical absorption process and also membrane separation does not require any chemical in the separation process, making it friendly to the environment. Additionally, since regeneration is not required in a membrane separation process, it is likely that less energy is consumed compared to chemical absorption. Most of the current membrane approaches investigated are polymeric CO2-selective membranes, where CO2 selectively passes through the membrane with the permeate stream mainly containing CO2. However, the flue gas from power plants contains a low concentration of CO2 compared to N2 (i.e., CO2 ~ 15% and N2 ~ 85% from coal-fired power plants), which requires compression power for increasing feed pressure to drive CO2 through the membrane to achieve a higher degree of separation (i.e., high purity and recovery). In contrast, if N2 permeates through the membrane instead of CO2, the compression energy to drive N2 will be lower because of the high concentration of CO2 in the flue gas. Consequently, this study tries to model and optimize various approaches of N2-selective membranes and also hybrids of the N2-selective membrane and CO2-selective membrane by minimizing the membrane area and subsequent energy consumption. The optimization results are then compared with CO2-selective membrane approaches to determine whether a N2-selective membrane is an attractive option for CO2 capture.
Description
| Type of resource | text |
|---|---|
| Date created | June 2013 |
Creators/Contributors
| Author | Narakornpijit, Kumnoon |
|---|---|
| Primary advisor | Wilcox, Jennifer |
| Degree granting institution | Stanford University, Department of Energy Resources Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Narakornpijit, Kumnoon. (2013). Process Modeling and Optimization of Postcombustion Carbon Capture Using a N2-Selective Membrane. Stanford Digital Repository. Available at: https://purl.stanford.edu/qp584cr0305
Collection
Master's Theses, Doerr School of Sustainability
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