Comparative studies of stripper overhead vapor integration-based configurations for post-combustion CO2 capture. (March 2015)

• Record Type: Journal Article
• Authors: Liang, Zhiwu; Gao, Hongxia; Rongwong, Wichitpan; Na, Yanqing
• Is Part Of: International journal of greenhouse gas control. Volume 34(2015:Mar.)
• Page Start: 75
• Page End: 84
• Publication Date: 2015-03
• Subjects: Monoethanolamine -- Carbon dioxide -- Split flow -- Vapor recompression -- ProMax -- Total equivalent work; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2014.12.019
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: Two new configurations SFVR and ISFVR were developed for CO2 capture process. The SFVR and ISFVR configurations significantly minimize heat duty. SFVR and ISFVR take full advantage of the latent heat of the overhead vapor and compression heat. The effects of key operational parameters on total equivalent work were investigated. SFVR and ISFVR performed better than that of baseline process within almost all conditions used in the presented work. Abstract: In this study, five absorption/stripping process configurations, including a conventional process, split flow with overhead exchanger, simple vapor recompression, and two new configurations-split flow with vapor recompression (SFVR), and improved split flow with vapor recompression (ISFVR) using 30 wt% aqueous monoethanolamine (MEA) for CO2 capture from a 300 MW power plant were simulated and compared, usingthe ProMax3.2 program. In the SFVR and ISFVR, the heat from the stripper overhead vapor and CO2 compression system were recovered to the stripping column in order to reduce the reboiler duty and overall energy consumption. Sensitivity analyses were carried out to evaluate the effects of key parameters (e.g. lean CO2 loading and feed fraction) with regards to energy consumption. The simulation results showed that the innovative configurations SFVR and ISFVR could fully utilize the latent heat of the stripper overhead vapor and decreased the total equivalent works by 17.21% and 17.52%, respectively, compared with those of the conventional configuration. The minimal total equivalent works were 0.808 GJ/t CO2 and 0.805 GJ/t CO2, respectively. The split stripping with overhead heat exchanger process is the third with a total equivalent work of 0.86 GJ/tCO2, while the simple vapor recompression configuration provided no reduction when compared with the conventional process.