Process for removing carbon dioxide regeneratively from gas streams
First Claim
1. Process for removing carbon dioxide from a hot gas stream selected from the group consisting of fuel gas and flue gas, which comprises the following sequential steps of:
- a) passing the gas stream through an absorbent-containing absorber wherein carbon dioxide from the gas stream is absorbed on the absorbent which is selected from the group consisting of CaO, MgO, CaCO3 ·
MgO and mixtures thereof, the absorption being carried out at such a temperature that the heat resulting from the absorption is captured in a heat exchanger and can be used for generating energy,b) discharging the gas stream from the absorber,c) desorbing at least partially the CO2 from the absorbent from step a) in a desorber by transferring at least a portion of the CO2 -loaded absorbent from the desorber into a heat exchanger where the heat from the hot gas stream liberates at least a portion of the CO2 from the CO2 -loaded absorbent thereby regenerating the absorbent and returning the regenerated absorbent back into said desorberd) returning the absorbent to the absorber of step a).
1 Assignment
0 Petitions
Accused Products
Abstract
A process for removing carbon dioxide regeneratively from a hot gas stream, containing flue gases or fuel gases, wherein the gas stream is successively: a) used for heating (1) and/or desorbing (2) a solid absorbent loaded with carbon dioxide; b) optionally used for generating energy (12); c) passed through an absorber (3) in which carbon dioxide from the gas stream is absorbed on the absorbent, and: d) is discharged (11); and wherein: e) the absorbent from step c) is desorbed in ta desorber (2) at least partially and optionally under elevated pressure and is then returned to step c). A system for carrying out the process is also described. The process and the system are suitable for removing carbon dioxide from combustion gases and for shifting (coal) gasification gases toward hydrogen.
-
Citations
10 Claims
-
1. Process for removing carbon dioxide from a hot gas stream selected from the group consisting of fuel gas and flue gas, which comprises the following sequential steps of:
-
a) passing the gas stream through an absorbent-containing absorber wherein carbon dioxide from the gas stream is absorbed on the absorbent which is selected from the group consisting of CaO, MgO, CaCO3 ·
MgO and mixtures thereof, the absorption being carried out at such a temperature that the heat resulting from the absorption is captured in a heat exchanger and can be used for generating energy,b) discharging the gas stream from the absorber, c) desorbing at least partially the CO2 from the absorbent from step a) in a desorber by transferring at least a portion of the CO2 -loaded absorbent from the desorber into a heat exchanger where the heat from the hot gas stream liberates at least a portion of the CO2 from the CO2 -loaded absorbent thereby regenerating the absorbent and returning the regenerated absorbent back into said desorber d) returning the absorbent to the absorber of step a). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification