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1. (WO2019048582) PROCESS FOR TREATING FLUE GASES IN CDS FLUE GAS TREATMENT
Nota: Texto obtenido mediante procedimiento automático de reconocimiento óptico de caracteres.
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« CLAIMS»

1. Process for treating flue gases in a circulating dry scrubber device wherein flue gases containing pollutants pass from a flue gases source to a reactor where said flue gases contact a sorbent injected to said reactor and form with said sorbent a suspension of sorbent particles in said flue gases wherein at least a fraction of said pollutants are captured by said sorbent said suspension being further sent to a particulate control device where said sorbent particles are separated from said flue gases and form respectively a flow of flue gases substantially depleted in pollutants and a flow of sorbent particles, said flow of flue gases substantially depleted in pollutants being evacuated from the particulate collection device towards a chimney, said flow of sorbent particles being at least partially recycled and returned to said reactor,

characterized in that said sorbent injected to said reactor consists essentially of slaked lime having a BJH total pore volume of at least 0.15 cm3/g and a BET specific surface area of at least 25 m2/g-

2. Process according to claim 1, wherein said sorbent injected to said reactor is fresh sorbent or a mixture of fresh sorbent and said flow of sorbent particles recycled and returned to said reactor.

3. Process according to claim 1 or claim 2, wherein said sorbent injected to said reactor is injected from a sorbent mixing zone to said reactor and wherein said flow of sorbent particles recycled from said particulate control device and returned to said reactor is recycled from said particulate control device and returned to said sorbent mixing zone before being sent to said reactor.

4. Process according to claim 2 or claim 3, wherein said sorbent injected to said reactor is a mixture of fresh sorbent and said flow of sorbent particles recycled and returned to said reactor, further injected from a sorbent mixing zone to said reactor and wherein said flow of sorbent particles recycled from said particulate control device and returned to said reactor is recycled from said particulate control device and returned to said sorbent mixing zone before being sent to said reactor.

5. Process according to anyone of the claims 1 to 4, wherein said flow of flue gases substantially depleted in pollutants exiting the particulate collection device is partially withdrawn to be recycled back to the reactor.

6. Process according to anyone of the claims 1 to 5, wherein water is further injected to said reactor or to said sorbent mixing zone through water injection means.

7. Process according to anyone of the claims 1 to 6, wherein said sorbent is injected such as the normalized stoichiometric ratio NSR divided by the conversion x is superior or equal to 1,

wherein: NSR = (nCa/nP)/N,

wherein nCa is the number of moles of Ca(OH)2 from the fresh sorbent;

wherein n is the number of moles of pollutant from the raw flue gas;

wherein N is the stoichiometric number of moles of Ca(OH)2 required according to the theoretical chemical reaction to completely convert one mole of pollutant;

wherein x = (Pin - Pout)/Pin;

wherein Pin is the number of moles of pollutant entering into the circulating dry scrubber device via the raw flue gas and;

wherein Pout is the number of moles of pollutant in the flue gas substantially depleted in pollutants being evacuated from the particulate collection device.

8. Process according to any one of the preceding claims wherein said sorbent is injected such as the normalized stoichiometric ratio NSR is of maximum 4.

9. Process according to any one of the preceding claims wherein said pollutant comprise S02 content and/or wherein the said sorbent is injected such as the normalized stoichiometric ratio is of maximum 2.

10. Process according to anyone of the preceding claims, wherein said suspension stays in movement inside said reactor for a predetermined residence time preferably superior than 1 seconds, more preferably superior than 5 seconds, and preferably inferior than 20 minutes, more preferably inferior than 5 minutes, more preferably inferior than 1 minute.

11. Process according to any one of the preceding claims, wherein said slaked lime has a BJH partial pore volume of at least 0.1 cm3/g for pore diameters ranging from 100 to 400 Angstrom.

12. Process according to any one of the preceding claims, wherein said slaked lime has a BJH total pore volume inferior or equal to 0.30 cm3/g- 13. Process according to any one of the preceding claims, wherein said slaked lime has a BET specific surface area inferior or equal to 50 m2/g.

14. Process according to any one of the preceding claims, wherein said slaked lime presents an alkali metal content of at least 0.2% and of maximum 3.5% based on the total weight of the said slaked lime.

15. Process according to any one of the preceding claims, wherein said alkali metal is sodium, potassium, lithium or a combination thereof.

16. Process according to any one of claims 2 to 15, wherein said sorbent is recycled at a recycling ratio comprised between 0.5 and 300, advantageously between 2 and 150, preferably between 10 to 60, said recycling ratio being defined as the injection rate of sorbent particles recycled and returned to said reactor divided by the injection rate of fresh sorbent.

17. Process according to any one of claims 6 to 16, wherein water is injected with a sufficient amount for having a moisture content in the sorbent injected to said reactor between 0.1 and 10 weight % based on the

total weight of said sorbent injected or for having a gas moisture content gas/water ratio between 5 and 35 vol %, preferably between 7 and 30 vol %, more preferably between 10 and 25 vol %.