Method for removing nitrogen oxides from combustion exhaust gases

Patent · Tue May 31 04:00:00 EDT 1977

OSTI ID:7208322

Shiga, S; Katsumata, T; Inaba, E; Okamoto, Y; Inmaru, A; Nishioka, T; Nakata, T; Takaki, S

A method for removing nitrogen oxides from combustion exhaust gases obtained after removing sulfur oxides by a wet process is described. Gases obtained after removing sulfur oxides from the combustion exhaust gases by a wet process are introduced into a wet electrostatic precipitator to remove most of the impurities such as dusts, fumes and mists. To remove the remaining impurities, it is passed through a dummy catalyst layer in the form of a fixed bed or a moving bed which is set before or after heating the gases to a temperature suitable for the reaction of reducing nitrogen oxides. It is then passed through a metal oxides catalyst layer in the form of a fixed bed in the presence of ammonia. Thus the gases containing nitrogen oxides are reduced to harmless gases.

• Assignee: Sumitomo Chemical Co., Ltd.
• Patent Number(s): US 4026992
• OSTI ID: 7208322
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
DUSTS
EQUIPMENT
GASEOUS WASTES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PACKED BED
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES