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Title: Radically New Adsorption Cycles for Carbon Dioxide Sequestration

Abstract

In Parts I and II of this project, a rigorous pressure swing adsorption (PSA) process simulator was used to study new, high temperature, PSA cycles, based on the use of a K-promoted HTlc adsorbent and 4- and 5-step (bed) vacuum swing PSA cycles, which were designed to process a typical stack gas effluent at 575 K containing (in vol%) 15 % CO{sub 2}, 75% N{sub 2} and 10% H{sub 2}O into a light product stream depleted of CO{sub 2} and a heavy product stream enriched in CO{sub 2}. Literally, thousands (2,850) of simulations were carried out to the periodic state to study the effects of the light product purge to feed ratio ({gamma}), cycle step time (t{sub s}) or cycle time (t{sub c}), high to low pressure ratio ({pi}{sub T}), and heavy product recycle ratio (R{sub R}) on the process performance, while changing the cycle configuration from 4- to 5-step (bed) designs utilizing combinations of light and heavy reflux steps, two different depressurization modes, and two sets of CO{sub 2}-HTlc mass transfer coefficients. The process performance was judged in terms of the CO{sub 2} purity and recovery, and the feed throughput. The best process performance was obtained from a 5-stepmore » (bed) stripping PSA cycle with a light reflux step and a heavy reflux step (with the heavy reflux gas obtained from the low pressure purge step), with a CO{sub 2} purity of 78.9%, a CO{sub 2} recovery of 57.4%, and a throughput of 11.5 L STP/hr/kg. This performance improved substantially when the CO{sub 2}-HTlc adsorption and desorption mass transfer coefficients (uncertain quantities at this time) were increased by factors of five, with a CO{sub 2} purity of 90.3%, a CO{sub 2} recovery of 73.6%, and a throughput of 34.6 L STP/hr/kg. Overall, this preliminary study disclosed the importance of cycle configuration through the heavy and dual reflux concepts, and the importance of knowing well defined mass transfer coefficients to the performance of a high temperature PSA process for CO{sub 2} capture and concentration from flue and stack gases using an HTlc adsorbent. This study is continuing.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
University of South Carolina
Sponsoring Org.:
USDOE
OSTI Identifier:
862198
DOE Contract Number:
FG26-03NT41799
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ADSORBENTS; ABSORPTION; CARBON DIOXIDE; DESORPTION; PERFORMANCE; SIMULATORS; CARBON SEQUESTRATION; FLUE GAS; AIR POLLUTION CONTROL; MATERIALS RECOVERY

Citation Formats

James A. Ritter, Armin D. Ebner, James A. McIntyre, Steven P. Reynolds, and Sarang A. Gadre. Radically New Adsorption Cycles for Carbon Dioxide Sequestration. United States: N. p., 2005. Web. doi:10.2172/862198.
James A. Ritter, Armin D. Ebner, James A. McIntyre, Steven P. Reynolds, & Sarang A. Gadre. Radically New Adsorption Cycles for Carbon Dioxide Sequestration. United States. doi:10.2172/862198.
James A. Ritter, Armin D. Ebner, James A. McIntyre, Steven P. Reynolds, and Sarang A. Gadre. Tue . "Radically New Adsorption Cycles for Carbon Dioxide Sequestration". United States. doi:10.2172/862198. https://www.osti.gov/servlets/purl/862198.
@article{osti_862198,
title = {Radically New Adsorption Cycles for Carbon Dioxide Sequestration},
author = {James A. Ritter and Armin D. Ebner and James A. McIntyre and Steven P. Reynolds and Sarang A. Gadre},
abstractNote = {In Parts I and II of this project, a rigorous pressure swing adsorption (PSA) process simulator was used to study new, high temperature, PSA cycles, based on the use of a K-promoted HTlc adsorbent and 4- and 5-step (bed) vacuum swing PSA cycles, which were designed to process a typical stack gas effluent at 575 K containing (in vol%) 15 % CO{sub 2}, 75% N{sub 2} and 10% H{sub 2}O into a light product stream depleted of CO{sub 2} and a heavy product stream enriched in CO{sub 2}. Literally, thousands (2,850) of simulations were carried out to the periodic state to study the effects of the light product purge to feed ratio ({gamma}), cycle step time (t{sub s}) or cycle time (t{sub c}), high to low pressure ratio ({pi}{sub T}), and heavy product recycle ratio (R{sub R}) on the process performance, while changing the cycle configuration from 4- to 5-step (bed) designs utilizing combinations of light and heavy reflux steps, two different depressurization modes, and two sets of CO{sub 2}-HTlc mass transfer coefficients. The process performance was judged in terms of the CO{sub 2} purity and recovery, and the feed throughput. The best process performance was obtained from a 5-step (bed) stripping PSA cycle with a light reflux step and a heavy reflux step (with the heavy reflux gas obtained from the low pressure purge step), with a CO{sub 2} purity of 78.9%, a CO{sub 2} recovery of 57.4%, and a throughput of 11.5 L STP/hr/kg. This performance improved substantially when the CO{sub 2}-HTlc adsorption and desorption mass transfer coefficients (uncertain quantities at this time) were increased by factors of five, with a CO{sub 2} purity of 90.3%, a CO{sub 2} recovery of 73.6%, and a throughput of 34.6 L STP/hr/kg. Overall, this preliminary study disclosed the importance of cycle configuration through the heavy and dual reflux concepts, and the importance of knowing well defined mass transfer coefficients to the performance of a high temperature PSA process for CO{sub 2} capture and concentration from flue and stack gases using an HTlc adsorbent. This study is continuing.},
doi = {10.2172/862198},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 11 00:00:00 EDT 2005},
month = {Tue Oct 11 00:00:00 EDT 2005}
}

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