Flue gas treatment method and installation

Patent metadata

Field	Value
Publication number	US-11845040-B2
Application number	US-202217573903-A
Country	US
Kind code	B2
Filing date	Jan 12, 2022
Priority date	Jan 12, 2021
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

Method and installation for treating a CO 2 - and H 2 O-containing flue gas generated by an industrial process unit before CCUS, whereby the flue gas evacuated from the unit is subjected to cooling to a temperature T2 between 100 and 600° C., whereby the cooled flue gas is pretreated in one or more particle removal and/or gas cleaning and/or drying stages and the temperature of the cooled flue gas is further reduced to a temperature T3<T2, before a first part of pretreated flue gas is subjected to CCUS, a second part of the pretreated flue gas being recycled at temperature T3 as a cooling agent and mixed with the flue gas during the controlled cooling thereof, partially or fully purified CO 2 from the CCUS may be recycled at temperature T4<T2 may be recycled as a cooling agent and mixed with the flue gas during the controlled cooling.

First claim

What is claimed is:

1. A method of treating a carbon dioxide and water containing flue gas generated by a flue-gas-generating unit, comprising:
a. evacuating a flue gas from a flue-gas-generating unit at a first temperature T1,
b. controlled cooling of the evacuated flue gas to a second temperature T2, wherein T2<T1 and wherein T2 is between 100 and 600° C., and
c. pretreating the cooled flue gas in one or more particle removal and/or gas cleaning and/or drying stages, whereby the temperature of the cooled flue gas is further reduced to a third temperature T3, wherein T3<T2,
d. subjecting a first part of the pretreated flue gas to Carbon Capture Utilization and/or Storage,

wherein:
a second part of the pretreated flue gas is recycled at the third temperature T3 as a cooling agent and mixed with the flue gas in step b

and/or
wherein the Carbon Capture Utilization and/or Storage includes a substep of purifying the first part by removing gaseous components other than carbon dioxide which are present at a level of at least 1% vol therefrom so as to obtain purified carbon dioxide whereby said substep optionally comprises a succession of multiple purification stages terminating in a final purification stage, whereby the stage or stages preceding the final purification generate partially purified carbon dioxide, whereby a fraction of the partially or fully purified carbon dioxide obtained at a fourth temperature T4, wherein T4<T2 is recycled as a cooling agent and mixed with the flue gas,
whereby the flue gas evacuated in step a comprises combustion gas generated by combustion of a carbon-containing fuel with a combustion oxidant containing 21% to 100% by volume oxygen.

2. A method of treating a carbon dioxide and water containing flue gas generated by a flue-gas-generating unit, comprising:
a. evacuating a flue gas from a flue-gas-generating unit at a first temperature T1,
b. controlled cooling of the evacuated flue gas to a second temperature T2, wherein T2<T1 and wherein T2 is between 100 and 600° C., and
c. pretreating the cooled flue gas in one or more particle removal and/or gas cleaning and/or drying stages, whereby the temperature of the cooled flue pas is further reduced to a third temperature T3, wherein T3<T2,
d. subjecting a first part of the pretreated flue gas to Carbon Capture Utilization and/or Storage,

wherein:
a second part of the pretreated flue gas is recycled at the third temperature T3 as a cooling agent and mixed with the flue gas in step b

and/or
wherein the Carbon Capture Utilization and/or Storage includes a substep of purifying the first part by removing gaseous components other than carbon dioxide which are present at a level of at least 1% vol therefrom so as to obtain purified carbon dioxide whereby said substep optionally comprises a succession of multiple purification stages terminating in a final purification stage, whereby the stage or stages preceding the final purification generate partially purified carbon dioxide, whereby a fraction of the partially or fully purified carbon dioxide obtained at a fourth temperature T4, wherein T4<T2 is recycled as a cooling agent and mixed with the flue gas,
whereby the flue-gas-generating unit comprises a unit selected from glass melting furnaces, glass refining furnaces, glass melting-and-refining furnaces, steel reheating furnaces, Electric Arc furnace, non-ferrous smelting and melting furnaces, cement furnaces, lime furnaces, enamel furnaces, hot stoves, electrolysers for primary metal production, cokery furnaces, electric furnaces for glass melting, electric furnaces for special metal melting and electrical furnaces for metal heat treatment.

3. An installation for treating a carbon dioxide- and water-containing stream of flue gas generated by a flue-pas-generating unit, the installation defining a flue-gas flow path, the flue-gas flow path comprising:
a. an inlet for receiving the gas stream from the unit,
b. a cooling unit for controlled cooling to a second temperature of the gas stream received through the inlet,
c. a pretreating unit for pretreating the cooled gas stream from the cooling unit, the pretreating unit comprising one or more of the following gas-pretreatment devices: gas dryer/dehumidifier, particle remover and gas cleaner, at least one device of the pretreating unit including a cooler adapted to cool the gas stream further to a third temperature T3, wherein T3<T2, and
d. an outlet downstream of the pretreating unit, said outlet connecting the flue-gas flow path to a Carbon Capture Utilization and/or Storage plant,

wherein:
the cooling unit comprises a gas mixer at or downstream of the inlet of the flue-gas flow path and

the installation further comprises a gas recycle loop between, on the one hand, a tapping point at or downstream of the pretreating unit, and, on the other hand, the gas mixer of the cooling unit, the recycle loop being adapted to recycle a portion of the gas stream at a third temperature to the gas mixer where the recycled portion of the flue gas) is mixed with the gas stream, thereby causing the gas stream to be cooled,
whereby the flue-gas-generating unit comprises a combustion unit and/or another industrial process, whereby the combustion unit is selected from glass melting furnaces, glass refining furnaces, glass melting-and-refining furnaces, steel reheating furnaces, Electric Arc furnace, non-ferrous smelting and melting furnaces, cement furnaces, lime furnaces, enamel furnaces, hot stoves, electrolysers for primary metal production, cokery furnaces, electric furnaces for glass melting, electric furnaces for special metal melting and electrical furnaces for metal or heat treatment.

Assignees

• Air Liquide

Inventors

• Del Corso Fabrice
• Caudal Jean
• Paubel Xavier

Classifications

• B01D53/60 Primary

  Simultaneously removing sulfur oxides and nitrogen oxides · CPC title

• B01D51/10 Primary

  Conditioning the gas to be cleaned · CPC title

• B01D53/02

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• C01B32/50

  Carbon dioxide · CPC title

• B01D53/002

  by condensation · CPC title