Techno-economic evaluation of a novel membrane-cryogenic hybrid process for carbon capture. (5th January 2022)

• Record Type: Journal Article
• Authors: Li, Run; Lian, Shaohan; Zhang, Zezhou; Song, Chunfeng; Han, Rui; Liu, Qingling
• Is Part Of: Applied thermal engineering. Volume 200(2022)
• Publication Date: 2022-01-05
• Subjects: Hybrid CO2 capture -- Membrane -- Cryogenic -- Energy consumption; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2021.117688
• Languages: English
• ISSNs: 1359-4311

Abstract

Graphical abstract: Highlights: Sub-ambient membrane-cryogenic process was designed for carbon capture. Effect of selectivity-enhanced membrane were explored. Parasite load of CFG and BFG decreased 7.11% and 15.55% respectively. Hybrid process was competitive for scenarios with high CO2 -content flue gas. Abstract: Gas separation properties of membranes are the significant parameters in CO2 capture process. It has been reported that membranes with high permeance and moderate CO2 /N2 selectivity are suitable for CO2 capture from coal-fired flue gas. However, with emerging high selectivity membrane and novel processes, it is essential to evaluate the influence of membrane selectivity on carbon capture performance, especially the significance of sub-ambient membrane operation. In this work, a sub-ambient membrane-cryogenic hybrid process was designed for CO2 capture from coal fired and blast furnace flue gas. It was found that energy consumption of vacuum can be saved when membranes with high selectivity were operated at sub-ambient condition. The cost and energy consumption of the optimal cases for coal fired flue gas were 36.14 $/tCO2 and 1.87 GJ/tCO2 according to the economic evaluation. The parasite load decreased 7.11% over the base case of 168 MW. In addition, the capture cost and energy consumption of optimal case for blast furnace flue gas were 28.81 $/tCO2 and 1.55 GJ/tCO2, respectively. The parasite load decreased 15.55% over the base case of 17.81 MW. The designed hybrid processes presented competitive potential when applied in high CO2 -content scenarios. In summary, the hybrid process based on membranes and cryogenic has been proven to have economic advantages under simulated conditions, indicating that it has the potential to be amplified by industrialization.