CO2 Capture by Using a Membrane-absorption Hybrid Process in the Nature Gas Combined Cycle Power Plants

Wenfeng Dong; Mengxiang Fang; Tao Wang; Fei Liu; Ningtong Yi

doi:10.4209/aaqr.2020.07.0374

CO2 Capture by Using a Membrane-absorption Hybrid Process in the Nature Gas Combined Cycle Power Plants

Wenfeng Dong This email address is being protected from spambots. You need JavaScript enabled to view it., Mengxiang Fang, Tao Wang, Fei Liu, Ningtong Yi

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Received: July 3, 2020
Revised: September 3, 2020
Accepted: September 3, 2020

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.2020.07.0374

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Cite this article:

Dong, W., Fang, M., Wang, T., Liu, F., Yi, N. (2021). CO₂ Capture by Using a Membrane-absorption Hybrid Process in the Nature Gas Combined Cycle Power Plants. Aerosol Air Qual. Res. 21, 200374. https://doi.org/10.4209/aaqr.2020.07.0374

HIGHLIGHTS

Mass transfer model of CO₂/N₂/H₂O separation membrane was established in Aspen plus.
Mass transfer, area and power were studied under different operating conditions.
Effect of CO₂ concentration of permeate gas on absorption was studied.
Feed/permeate gas pressure ratio was optimization for reducing compressor power.

ABSTRACT

This study’s main objective was to optimize the design parameters of the hybrid membrane-absorption CO₂-capture process in natural gas steam cycle (NGCC) power plants. To calculate the CO₂ concentration in the permeating gas and the required area for the separating membrane, a mass transfer model of a membrane for separating CO₂, N₂ and H₂O was developed in Aspen Plus. The effects of the CO₂ recovery rate of the membrane, the ratio of the feed gas pressure to the permeating-side gas pressure and the flow rate of the flue gas on the required area for the membrane, the power consumption of the compressor and the heat duty for the solvent regeneration were then analyzed. The optimal feed-gas-to-permeating-side-gas pressure ratio and the flue gas flow rate were found to be 10:1 and 50%, respectively. Furthermore, compared to traditional chemical absorption, the solvent regeneration’s heat duty decreased by more than 20.7% when the gas flow rate and the CO₂ recovery rate were 100% and 20%, respectively.

Keywords: Membrane-absorption process, Mass transfer model, Natural gas steam combined cycle power plants, CO2 capture, Monoethanolamine