US 8,784,761 B2 · Single absorber vessel to capture CO2

Abstract

A system for removing carbon dioxide from a flue gas stream is provided, the system comprising an absorber vessel configured to receive a flue gas stream, the absorber vessel comprising a first absorption stage configured to receive the flue gas stream and contact it with a first ionic solution, a second absorption stage configured to receive flue gas which has passed the first absorption stage and contact it with a second ionic solution, a first sump vessel, and a second sump vessel. Furthermore, a method for removing CO2 from a flue gas stream containing CO2 is provided, the method comprising the steps of a) contacting a flow of a first ionic solution comprising NH3 with a flue gas stream to remove a first portion of CO2 from the flue gas stream, b) collecting the used ionic solution from step a) in a first sump vessel, c) recycling ionic solution from the first sump vessel to step a), d) contacting a flow of a second ionic solution comprising NH3 with the flue gas stream to remove a second portion of CO2 from the flue gas stream, e) collecting the used ionic solution from step d) in a second sump vessel, and f) recycling ionic solution from the second sump vessel to step d).

Claims21

Dependent claims

Method for removing CO2 from a flue gas stream containing CO2, the method comprising the steps of:

arranging in a single absorber vessel
a) in a cycle, contacting a flow of a first ionic solution comprising NH3 with a flue gas stream to remove a first portion of CO2 from the flue gas stream to produce a used first ionic solution,
b) collecting the used first ionic solution in a first sump vessel to obtain the first ionic solution, said first sump vessel defined by a first division of a sump of the single absorber vessel, and
c) recycling the first ionic solution from said first sump vessel back to flue gas stream to complete the cycle and remove another first portion of CO2 from the flue gas stream, and
d) in a cycle, contacting a flow of a second ionic solution comprising NH3 with the flue gas stream to remove a second portion of CO2 from the flue gas stream to produce a used second ionic solution,
e) collecting the used second ionic solution in a second sump vessel to obtain the second ionic solution, said second sump vessel defined by a second division of a sump of the single absorber vessel, and
f) recycling the second ionic solution from said second sump vessel back to flue gas stream to complete the cycle and remove another second portion of CO2 from the flue gas stream.

4 more elements

Dependencies are inferred from the claim text.

Single absorber vessel to capture CO2

Life of this patent

Single absorber vessel to capture CO2

Life of this patent

Abstract

Claims21