Efficient waste heat recovery process from sulfur containing flue gas

Patent · Tue Apr 15 04:00:00 EST 1986

OSTI ID:5747186

Fan, C T

A method of recovering waste heat from flue gas is described containing particulate solids, CO/sub 2/, SO/sub 2/, SO/sub 3/, and H/sub 2/O. The process consists of: (a) passing hot flue gas over heat exchange surface attackable by sulfuric acid, so as to release heat to the heat exchange surface and to partially cool the flue gas to a temperature within the range of about 350/sup 0/F to above the condensation temperature of sulfuric acid; (b) passing resultant partially cooled flue gas through a waste heat exchanger in indirect heat exchange contact with boiler feed water to preheat the boiler feed water and to further cool the flue gas to another temperature still above the condensation temperature of sulfuric acid: (c) passing resultant further partially cooled flue gas through a particulate removal zone to separate the particulate solids from the partially cooled flue gas, and compressing resultant solids-depleted partially cooled flue gas to thereby raise the temperature thereof: and (d) passing resultant compressed solids-depleted flue gas to a regenerator system containing heat exchange surfaces resistant to attack by sulfuric acid to release additional heat and to cool the temperature below the condensation temperature of sulfuric acid, thereby depositing sulfuric acid on the heat exchange surfaces.

• Assignee: Linde Aktiengesellschaft, Wiesbaden
• Patent Number(s): US 4582122
• OSTI ID: 5747186
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
BOILERS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COMPRESSION
COOLING
ENERGY RECOVERY
ENERGY TRANSFER
FEEDWATER
FLUE GAS
GASEOUS WASTES
HEAT EXCHANGERS
HEAT RECOVERY
HEAT TRANSFER
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
INORGANIC ACIDS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
POLLUTION ABATEMENT
RECOVERY
REGENERATORS
SULFUR COMPOUNDS
SULFUR CONTENT
SULFUR DIOXIDE
SULFUR OXIDES
SULFUR TRIOXIDE
SULFURIC ACID
WASTE HEAT UTILIZATION
WASTE PRODUCT UTILIZATION
WASTES
WATER