Economics at your fingertips  

Process-integrated design of a sub-ambient membrane process for CO2 removal from natural gas power plants

Sunghoon Lee and Jin-Kuk Kim

Applied Energy, 2020, vol. 260, issue C, No S0306261919319427

Abstract: This paper proposes an advanced sub-ambient membrane process that applies an improved CO2/N2 selectivity under cold temperatures for CO2 removal from a natural gas combined-cycle power plant. The use of a large excess of combustion air in a natural gas power plant results in a relatively diluted CO2 exhaust gas, typically by 3–4%, which makes it difficult to achieve an energy-efficient CO2 capture. The sub-ambient membrane process using exhaust gas recirculation and/or selective exhaust gas recirculation is designed to concentrate the CO2 from 4 to 6–10%. In addition, the heat integration of liquefied natural gas (LNG) regasification not only provides a nearly free cold energy source for producing a cold processing environment, it also maximizes the full potential of the heat recovery. Among the different membrane designs proposed, an integrated process using all design options demonstrates the lowest CO2 capture cost at $ 57/tCO2, which is a 55.1% reduction in capture costs, and a 70.1% decrease in parasitic load compared to an early configuration. A sensitivity analysis was conducted to understand the impact of the membrane performance, namely, the CO2 permeance and CO2/N2 selectivity, on the process design and economics of the CO2 capture process considered herein, through which guidelines for the development of membrane materials and a conceptual insight into the design and optimization of a membrane-based capture process can be obtained.

Keywords: Membrane process design; CO2 capture; LNG regasification; Exhaust gas recirculation; Selective exhaust gas recirculation (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: Track citations by RSS feed

Downloads: (external link)
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link:

Ordering information: This journal article can be ordered from
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2019.114255

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Haili He ().

Page updated 2020-05-23
Handle: RePEc:eee:appene:v:260:y:2020:i:c:s0306261919319427