Process for controlling nitrogen oxides in exhaust gases and apparatus therefor

Patent · Tue Nov 24 04:00:00 EST 1981

OSTI ID:5961881

Atsukawa, M; Matsumoto, K; Sera, T; Seto, T; Ukawa, N

In a process and an apparatus for controlling oxides of nitrogen in exhaust gases from combustion equipment by decomposing the oxides, in the presence of oxygen, with ammonia blown into the equipment and associated ducting at temperatures within the range from 700 to 1300/sup 0/C, a catalyst assembly is arranged, with the catalytic surfaces of the component units substantially in parallel to the direction of exhaust gas flow, in a region where the temperature of the gas after the decomposing treatment is between 300 and 500/sup 0/C, and the gas after the decomposing treatment is caused to pass through the catalyst assembly to decompose residual nitrogen oxides and ammonia in the gas to innocuous substances. An additional supply of ammonia, in an amount from 0.5 to 1.5 times equivalent (In molar ratio) to the amount of nitrogen oxides in moles in the gas is introduced into the space immediately upstream of the catalyst assembly, thereby to accelerate the decomposition of the oxides in the gas to make it harmless.

• Assignee: Mitsubishi Jukogyo K K (Japan)
• Patent Number(s): US 4302431
• OSTI ID: 5961881
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
02 PETROLEUM
020800 -- Petroleum-- Waste Management
03 NATURAL GAS
030700 -- Natural Gas-- Waste Management
04 OIL SHALES AND TAR SANDS
040900 -- Oil Shales & Tar Sands-- Waste management
AMMONIA
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DENITRIFICATION
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
HYDRIDES
HYDROGEN COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PLATES
REMOVAL
VERY HIGH TEMPERATURE
WASTES