Browse > Article
http://dx.doi.org/10.9713/kcer.2018.56.5.647

A Study on the Optimal Process Design of Cryogenic Air Separation Unit for Oxy-Fuel Combustion  

Choi, Hyeung-Chul (Daesung Cryogenic Research Institute, Daesung Industrial Gases Co., Ltd.)
Moon, Hung-Man (Daesung Cryogenic Research Institute, Daesung Industrial Gases Co., Ltd.)
Cho, Jung-ho (Department of Chemical Engineering, University of Kongju)
Publication Information
Korean Chemical Engineering Research / v.56, no.5, 2018 , pp. 647-654 More about this Journal
Abstract
In order to solve the global warming and reduce greenhouse gas emissions, it has been developed the $CO_2$ capture technology by oxy-fuel combustion. But there is a problem that the economic efficiency is low because the oxygen production cost is high. ASU (Air Separation Unit) is known to be most suitable method for producing large capacity of oxygen (>2,000 tpd). But most of them are optimized for high purity (>99.5%) oxygen production. If the ASU process is optimized for low purity(90~97%) oxygen producing, it is possible to reduce the production cost of oxygen by improving the process efficiency. In this study, the process analysis and comparative evaluation was conducted for developing large capacity ASU for oxy-fuel combustion. The process efficiency was evaluated by calculating the recovery rate and power consumption according to the oxygen purity using the AspenHysys. As a result, it confirmed that the optimal purity of oxygen for oxyfuel combustion is 95%, and the power consumption can be reduced by process optimization to 12~18%.
Keywords
Oxy-fuel combustion; Oxygen; Cryogenic; Air separation; ASU;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Barron, R. F., "Cryogenic systems., 2nd ed.," Monographs on Cryogenics, New York: Oxford University Press(1985).
2 Yong, P. S., Moon, H. M., Son, M. R. and Yi, S. Chul., "A Reliability of Equation of State for Nitrogen, Oxygen and Argon," J. of KIGAS 1(1), 41-48(1997).
3 Yong, P. S., Moon, H. M. and Yi, S. Chul., "A Study on the Development of a Cryogenic Air Separation Unit to produce High purity Nitrogen," J of KIASC, 3(1), 69-73(2001).
4 IEA Report 2005/9, "Oxy Combustion Processes for $CO_2$ Capture from PowerPlant"(2005).
5 Harry, C and Williamsville, N. Y., "Side Column Cryogenic Rectification System for Producing Lower Purity Oxygen," U.S Patent, 5,463,871(1995).
6 Rakesh, A., Zbigniew, E. and Macungie, T. F., "Three Column Cryogenic Cycle for the Production of Impure Oxygen and Pure Nitrogen," U.S Patent, 5,682,764(1997).
7 Allam, R. J., "Improved Oxygen Production Technologies," Energy Procedia, 1(1), 461-470(2009).   DOI
8 Higginbotham, P., White, V., Fogash, K. and Guvelioglu, G., "Oxygen Supply for Oxycoal $CO_2$ Capture," Energy Procedia, 4, 884-891(2011).   DOI
9 Fu, C. and Gundersen, T., "Using Exergy Analysis to Reduce Power Consumption in Air Separation Units for Oxy-combustion Processes," Energy, 44(1), 60-68(2012).   DOI
10 Lee, H. K., Choi, S. M., Moon, H. M., Seo, S. I., "Proposed Process and Design Considerations for Air Separation and $CO_2$ Purification in a 100MWe Oxy-Coal Power Generation System," Energy Technology, 1, 217-225(2013).   DOI
11 Ebrakimi, A., Meratizaman, M., Reyhani, H. A., Pourali, O. and Amidpour, M., "Energetic, Exergeric and Economic Assessment of Oxygen Production from Two Columns Cryogenic Air Separation Unit," Energy., 90, 1298-1316(2015).   DOI
12 Aspen Technology, "AspenHysys Thermodynamics V.8.8," (2015).
13 Hankinson, R. W., Thomson, G. H. and Brobst, K. R., "An Improved Correlation for densities of Compressed Liquids and Liquid Mixtures," AIChE J., 28(4), 671-676(1982).   DOI