Removal of SOx, NOx, and particulate from combusted carbonaceous fuels

Patent · Tue Sep 10 04:00:00 EDT 1985

OSTI ID:5789953

Dayen, W R

The invention is a method for removing sulfur oxides, nitrogen oxides and particulate from the products of combusted carbonaceous fuels. Sulfur oxides, nitrogen oxides and particulate are currently discharged to the atmosphere as flue gas in quantities highly detrimental to the environment. Potassium compounds, as are found in agricultural grade potash, are dispersed throughout the combustion products at the exit of the combustion zone of boilers. The potassium compounds decompose as a result of combustion temperatures in excess of their melting points. The potassium, as an ionic vapor, reacts with the sulfur and nitrogen oxide gases present, to form potassium sulfates, potassium nitrites and potassium nitrates. When the combined products stream, traversing the boiler equipment train, cool sufficiently, the potassium, present in excess, condenses as potassium oxide on the surfaces of the particles present. The larger particles are removed from the non-condensed vapor and gas by the centrifugal and gravitational forces exerted within cyclones. The smaller particles are removed from the non-chargable vapor and gases by the electrostatic charge and attraction created within the precipitator. The dry particles discharged from the cyclones and precipitator are ready for ultimate end use as potash fertilizer without further treatment. The flue gas atmospheric emissions contain only trace quantities of sulfur oxides, nitrogen oxides and particulate.

• Assignee: IFI; EDB-86-092515
• Patent Number(s): US 4540554
• OSTI ID: 5789953
• 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
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
320604 -- Energy Conservation
Consumption
& Utilization-- Municipalities & Community Systems-- Municipal Waste Management-- (1980-)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADDITIVES
AIR POLLUTION ABATEMENT
ALKALI METAL COMPOUNDS
BOILERS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
CONCENTRATORS
CYCLONE SEPARATORS
DENITRIFICATION
DESULFURIZATION
ELECTROSTATIC PRECIPITATORS
ELECTROSTATIC SEPARATION
ENERGY SOURCES
EQUIPMENT
FERTILIZERS
FLUE GAS
FOSSIL FUELS
FUELS
GASEOUS WASTES
INERTIAL SEPARATORS
NITRATES
NITRIDES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PNICTIDES
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
POTASSIUM NITRIDES
POTASSIUM SULFATES
PRODUCTION
REMOVAL
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SULFATES
SULFUR COMPOUNDS
SULFUR OXIDES
WASTE PRODUCT UTILIZATION
WASTES