Process for the dry desulfurization of a combustion gas

Details Process for the dry desulfurization of a combustion gas Process for the dry desulfurization of a combustion gas

1997-12-01

1999-11-30

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

42324408, 4232155, 423DIG16, B01D 5350, B01D 5396

Patent

active

059937653

ABSTRACT:
The process for dry desulfuration of a combustion gas includes providing an electrostatic precipitator (12) or an inertia force separator for dedusting; dedusting the combustion gas at temperatures of 100.degree. C. to 180.degree. C. in the electrostatic precipitator or at temperatures of 100.degree. C. to 700.degree. C. in the inertia force separator to form a partially dedusted combustion gas with a solids content of 5 to 40 g/Nm.sup.3 ; mixing the partially dedusted combustion gas with CaO and/or Ca(OH).sub.2 and optionally CaCO.sub.3 to form a gaseous mixture; providing a circulating fluidized bed device including a fluidized-bed reactor (8) and a downstream solids separator (7) with a return line (17) to the fluidized-bed reactor (8), the solids separator (7) being either another electrostatic precipitator or a bag filter; feeding the gaseous mixture and water into the fluidized-bed reactor (8); cooling the gaseous mixture in the fluidized-bed reactor (8) to a temperature of 50.degree. C. to 90.degree. C.; withdrawing a solids-containing gas from an upper portion of the fluidized-bed reactor (8); feeding the solids-containing gas into the solids separator (7) to form separated solids and a cleaned gas; recycling one portion of the separated solids into the fluidized-bed reactor (8) and mixing another portion of the separated solids with the combustion gas.

REFERENCES:
patent: 4548797 (1985-10-01), Sauer et al.
patent: 4604269 (1986-08-01), Yoon
patent: 4670237 (1987-06-01), Graf et al.
patent: 4810478 (1989-03-01), Graf
patent: 5096680 (1992-03-01), Lindbauer et al.

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