Lime slaking and grit removal process utilized in SO/sub 2/ removal

Patent · Tue Nov 13 04:00:00 EST 1984

OSTI ID:6113675

Emmett, R C

A lime slaking system for hydration of lime and removal of unwanted grit, particularly for formation of reactive slaked lime to be used in SO/sub 2/ scrubbing of effluent gases, comprising a series of slaking vessels for reacting CaO and water while agitating the reactants, a dilution mix tank receiving a viscous slaked lime slurry from the vessels, diluent for the dilution tank comprising an upstream classifier overflow stream, a cyclone receiving pumped diluted slurry from tank, the overflow of the cyclone providing usable slaked lime product and the underflow exiting to the upstream classifier where grit materials are separated and removed. Dilution for effective classification is provided by spent scrubbing process water containing appreciable sulfate ions. Detention time is such in the classifier along with presence of a prescribed amount of slaked lime exiting the cyclone underflow, to allow precipitation of the sulfate ion as gypsum in the classifier to prevent scaling in the gas scrubbing equipment. Optionally an attrition machine may be incorporated along with a subsequent classifier to recover any occluded slaked lime particles reporting with the grit discharge from classifier.

• Assignee: Envirotech Corporation
• Patent Number(s): US 4482528
• OSTI ID: 6113675
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ADSORBENTS
AIR POLLUTION ABATEMENT
CARBONATE ROCKS
CHALCOGENIDES
DILUTION
EQUIPMENT
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
HYDRATION
LIMESTONE
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE CLASSIFIERS
POLLUTION ABATEMENT
POWER PLANTS
REMOVAL
ROCKS
SCRUBBING
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SOLIDS
SOLVATION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES