Energy and water recovery from flue gases

Patent · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5703046

Hoekstra, I A

Energy and water are recovered from flue gases by cooling them to a temperature sufficiently below the acid dew point temperature by contact with an aqueous stream so as to recover the sensible heat and to reduce the water content of the flue gases by about 50%. The water by which the aqueous stream is enriched is subsequently flashed off to cool the stream back to its original temperature and the water vapor is then compressed to generate a higher temperature vapor stream which is condensed to recover the water and extract heat. The aqueous stream is continuously enriched with material such as calcium carbonate to control the pH sufficiently as to avoid substantial corrosion due to acidic gases removed from the flue gases and the aqueous stream is purged continuously or periodically to remove compounds such as chlorides, calcium sulphates, and fly ash solids picked up from the flue gases. The system may be operated in two stage fashion in which separate aqueous streams are employed to cool the flue gases in two serial stages.

• Assignee: EDB-85-079090
• Patent Number(s): US 4491093
• OSTI ID: 5703046
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320304* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Waste Heat Recovery & Utilization
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
ASHES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COMPRESSION
COOLING
CORROSION
DISPERSIONS
ENERGY RECOVERY
ENERGY STORAGE
EQUIPMENT
FLUE GAS
FLUIDS
FLY ASH
GASEOUS WASTES
GASES
HALIDES
HALOGEN COMPOUNDS
HEAT RECOVERY
HEAT RECOVERY EQUIPMENT
HEAT STORAGE
MIXTURES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PH VALUE
RECOVERY
REMOVAL
RESIDUES
SENSIBLE HEAT STORAGE
SEPARATION EQUIPMENT
SOLUTIONS
STORAGE
SULFATES
SULFUR COMPOUNDS
VAPOR CONDENSATION
VAPORS
WASTES
WATER REMOVAL
WATER VAPOR