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

Patent · Tue Oct 13 04:00:00 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
• Country of Publication: United States
• Language: English

Related Subjects

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