Method of purifying flue gases from sulphur dioxide

Patent · Tue Jun 12 04:00:00 EDT 1984

OSTI ID:6134824

Lindau,

Purification of gases from acid gas components according to the dry method means that the gas is contacted with an absorbent in a solid phase, which yields a relatively low reaction rate. In order to increase the reaction rate according to the invention, the gas is contacted with a mixture consisting partially of a solid absorbent phase and partially a liquid phase on the surface of the solid phase. At the purification of flue gases from sulphur dioxide hot gas is contacted with an absorption liquid in a drying apparatus, where evaporation of the water supplied and a reaction between sulphur dioxide and the absorption substance take place simultaneously, whereafter the solid product phase is separated from the gas in a dust separator and a slower, secondary absorption reaction is operative. In order to achieve a higher reaction rate in the dust separator, a substance is added to the flue gas which, together with other chemical species derived from the gas or the solid absorbent forms a liquid phase distributed over the surface of the solid phases. The liquid phase usually contains water and has a good solubility for reactants and reaction products.

• Assignee: Flakt Aktiebolag (Sweden)
• Patent Number(s): US 4454102
• OSTI ID: 6134824
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
ADSORPTION
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DESULFURIZATION
EQUIPMENT
EVAPORATION
FLUE GAS
GASEOUS WASTES
KINETICS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLLUTION CONTROL EQUIPMENT
REACTION KINETICS
SEPARATION EQUIPMENT
SORPTION
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES