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Title: CO.sub.2 separation from low-temperature flue gases

Abstract

Two methods are provide for the separation of carbon dioxide from the flue gases. The first method utilizes a phase-separating moiety dissolved in an aqueous solution of a basic moiety to capture carbon dioxide. The second method utilizes a phase-separating moiety as a suspended solid in an aqueous solution of a basic moiety to capture carbon dioxide. The first method takes advantage of the surface-independent nature of the CO.sub.2 absorption reactions in a homogeneous aqueous system. The second method also provides permanent sequestration of the carbon dioxide. Both methods incorporate the kinetic rate enhancements of amine-based scrubbing while eliminating the need to heat the entire amine solution (80% water) in order to regenerate and release CO.sub.2. Both methods also take advantage of the low-regeneration temperatures of CO.sub.2-bearing mineral systems such as Na.sub.2CO.sub.3/NaHCO.sub.3 and K.sub.2CO.sub.3/KHCO.sub.3.

Inventors:
 [1];  [2];  [3];  [4]
  1. (Irwin, PA)
  2. (Salem, MA)
  3. (Monroeville, PA)
  4. (Bethel Park, PA)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1017440
Patent Number(s):
7,842,126
Application Number:
12/241,430
Assignee:
The United States of America as represented by the United States Department of Energy (Washington, DC) NETL
DOE Contract Number:
NETL
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Dilmore, Robert, Allen, Douglas, Soong, Yee, and Hedges, Sheila. CO.sub.2 separation from low-temperature flue gases. United States: N. p., 2010. Web.
Dilmore, Robert, Allen, Douglas, Soong, Yee, & Hedges, Sheila. CO.sub.2 separation from low-temperature flue gases. United States.
Dilmore, Robert, Allen, Douglas, Soong, Yee, and Hedges, Sheila. 2010. "CO.sub.2 separation from low-temperature flue gases". United States. doi:. https://www.osti.gov/servlets/purl/1017440.
@article{osti_1017440,
title = {CO.sub.2 separation from low-temperature flue gases},
author = {Dilmore, Robert and Allen, Douglas and Soong, Yee and Hedges, Sheila},
abstractNote = {Two methods are provide for the separation of carbon dioxide from the flue gases. The first method utilizes a phase-separating moiety dissolved in an aqueous solution of a basic moiety to capture carbon dioxide. The second method utilizes a phase-separating moiety as a suspended solid in an aqueous solution of a basic moiety to capture carbon dioxide. The first method takes advantage of the surface-independent nature of the CO.sub.2 absorption reactions in a homogeneous aqueous system. The second method also provides permanent sequestration of the carbon dioxide. Both methods incorporate the kinetic rate enhancements of amine-based scrubbing while eliminating the need to heat the entire amine solution (80% water) in order to regenerate and release CO.sub.2. Both methods also take advantage of the low-regeneration temperatures of CO.sub.2-bearing mineral systems such as Na.sub.2CO.sub.3/NaHCO.sub.3 and K.sub.2CO.sub.3/KHCO.sub.3.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2010,
month =
}

Patent:

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  • This patent describes a method for removing carbonaceous deposits from fluid solid particles and separating entrained solid fines from combustion product flue gases which comprises: forming a mixture of solid particles comprising carbonaceous deposits with sufficient hot regenerated solid particles to form a mixture thereof at a temperature of at least 649/sup 0/C (1200/sup 0/F) dispersed in suspension forming combustion supporting oxygen containing gas at a particles concentration within the range of 3 to 35 lbs/cu.ft.; passing the suspension mixture thus formed in (a) upwardly through a combustion zone as a suspension under conditions selected to restrict combustion temperatures thereofmore » below 871/sup 0/C (1600/sup 0/F); discharging the upwardly flowing gas-solids suspension in combustion product flue gases as a confined stream into a zone in open communication with an annular zone about the confined stream, directing the discharged suspension downwardly through the annular zone at a velocity whereby entrained particles solid are separated from combustion flue gas by withdrawing flue gas radially from the annular zone by an open ended confined passageway extending outwardly from above a collected bed of solid particles in a lower bottom portion of the annular zone; passing separated flue gases comprising entrained solid fines from an upper part of the second separation zone upwardly through an open end elongated confined riser transport zone discharging upwardly into a third separation zone under velocity conditions establishing a momentum differential between entrained solid fines and combustion product flue gases.« less
  • A gas separation process for treating exhaust gases from the combustion of gaseous fuels, and gaseous fuel combustion processes including such gas separation. The invention involves routing a first portion of the exhaust stream to a carbon dioxide capture step, while simultaneously flowing a second portion of the exhaust gas stream across the feed side of a membrane, flowing a sweep gas stream, usually air, across the permeate side, then passing the permeate/sweep gas back to the combustor.
  • A process for making a granular sorbent to capture carbon dioxide from gas streams comprising homogeneously mixing an alkali metal oxide, alkali metal hydroxide, alkaline earth metal oxide, alkaline earth metal hydroxide, alkali titanate, alkali zirconate, alkali silicate and combinations thereof with a binder selected from the group consisting of sodium ortho silicate, calcium sulfate dihydrate (CaSO.sub.4.2H.sub.2O), alkali silicates, calcium aluminate, bentonite, inorganic clays and organic clays and combinations thereof and water; drying the mixture and placing the sorbent in a container permeable to a gas stream.
  • A method for separating CO.sub.2 from a gas stream comprised of CO.sub.2 and other gaseous constituents using a zeolite sorbent in a swing-adsorption process, producing a high temperature CO.sub.2 stream at a higher CO.sub.2 pressure than the input gas stream. The method utilizes CO.sub.2 desorption in a CO.sub.2 atmosphere and effectively integrates heat transfers for optimizes overall efficiency. H.sub.2O adsorption does not preclude effective operation of the sorbent. The cycle may be incorporated in an IGCC for efficient pre-combustion CO.sub.2 capture. A particular application operates on shifted syngas at a temperature exceeding 200.degree. C. and produces a dry CO.sub.2 streammore » at low temperature and high CO.sub.2 pressure, greatly reducing any compression energy requirements which may be subsequently required.« less