Method of desulfurization of flue gases

Patent · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5753920

Hoekstra, I A

Preliminarily cooled flue gases from which particulates and sulfur trioxide have been removed are contacted with an SO/sub 2/ absorbing liquid and the SO/sub 2/ laden liquid is then regenerated by multi-stage vacuum stripping and returned in a closed cycle to the absorber. The absorbing liquid contains an additive and is dilute solution of, preferably, calcium ions in water. The additive added in minor amount sufficient to provide a partial pressure of SO/sub 2/ in the absorber equivalent to the partial pressure of SO/sub 2/ in water in the temperature range of about 15/sup 0/ C. to -20/sup 0/ C. The preliminarily cooled gas is at a temperature in the order of 125/sup 0/ F. The heat removed from the closed cycle by vacuum stripping is substantially equal to the heat given up by the flue gas in the absorber, and the sepmterature difference between the liquid on entering and leaving the desorber is in the order of 10/sup 0/-30/sup 0/ F.

• Assignee: EDB-85-079996
• Patent Number(s): US 4491461
• OSTI ID: 5753920
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
AIR POLLUTION CONTROL
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
CLOSED-CYCLE SYSTEMS
CONTROL
COOLING
DESORPTION
DESULFURIZATION
ENERGY TRANSFER
EQUIPMENT
FLUE GAS
GASEOUS WASTES
HEAT TRANSFER
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFUR TRIOXIDE
WASTES