Limestone-based wet flue gas desulfurization process

Details Limestone-based wet flue gas desulfurization process Limestone-based wet flue gas desulfurization process

1994-08-16

1997-05-20

Straub, Gary P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

42324306, 42324308, B01D 5350

Patent

active

056309910

ABSTRACT:
The limestone dissolution rate for limestone-containing slurries used in wet flue gas desulfurization (WFGD) systems is enhanced by the addition of ammonium ions. The ammonium ions may be obtained by incorporating into the limestone-containing slurry gaseous or aqueous ammonia and/or a water-soluble ammonium salt, such as ammonium sulfate, ammonium chloride, or ammonium carbonate. Increasing the limestone dissolution rate for limestone-containing slurries used in WFGD systems allows courser limestone particles, lower limestone stoichiometry and lower slurry recycle rates to be employed, thereby saving capital and operating costs. The ammonium ions may be recovered and reused in the process.

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Rochelle et al. "The Effect of Additives on Mass Transfer in CaCo.sub.3 or CaO Slurry Scrubbing of SO.sub.2 from Waste Gases" Ind. Eng. Chem. Fund. vol. 16 No. 1 (1977, No Month Cited) pp. 67-75.

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