System for removing solids from a used lime or limestone slurry scrubbing liquor in flue gas desulfurization

Patent · Tue Oct 13 00:00:00 EDT 1981

OSTI ID:5857762

Randolph, A D

The flue gas desulfurization process using a lime or limestone slurry scrubbing solution produces used liquor containing calcium sulfite or sulfate (Typically gypsum). Precipitated particles are removed by feeding the used scrubbing liquor to an agitated crystallization zone to grow crystals and directing part of the used scrubbing liquor from that zone to a quiescent crystallization zone, in which particles are settled back into the agitated zone. An underflow stream from the agitated zone containing large crystals is combined with an overflow stream from the quiescent zone, which combined stream is clarified with the fines being returned to the scrubber and the large crystals being removed as a waste product. Apparatus for performing the above process in which the agitated and quiescent crystallization zones form part of a single crystallization vessel, and the two zones are separated by a baffle.

• Assignee: Arizona, University of Foundation; Electric Power Research Institute
• Patent Number(s): US 4294807
• OSTI ID: 5857762
• Resource Relation: Patent File Date: Filed date 10 Nov 1980
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
FLUE GAS
DESULFURIZATION
GYPSUM
REMOVAL
LIME-LIMESTONE WET SCRUBBING PROCESSES
BAFFLES
CALCIUM
CALCIUM SULFATES
COAL
CRYSTALLIZATION
CRYSTALS
FOSSIL-FUEL POWER PLANTS
MIXING
SOLID WASTES
SPENT LIQUORS
SULFITES
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
CALCIUM COMPOUNDS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CONTROL EQUIPMENT
ELEMENTS
ENERGY SOURCES
EQUIPMENT
FLOW REGULATORS
FOSSIL FUELS
FUELS
GASEOUS WASTES
INDUSTRIAL WASTES
LIQUID WASTES
MATERIALS
METALS
MINERALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POWER PLANTS
SCRUBBING
SULFATES
SULFUR COMPOUNDS
THERMAL POWER PLANTS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management