NO/sub x/ emission control for the design and operation of fluidized-bed combustion systems. Final report

Technical Report · Tue May 01 00:00:00 EDT 1984

OSTI ID:5062150

Bailie, R C

This report deals with the reduction of NO/sub x/ with char in a hot fluid bed. The fluidized bed combustor with its high heat transfer rates is one possibility for improving the potential for coal use. As in all coal-fired systems, control of nitric oxide emissions is a major environmental concern because of its harm to vegetation and human health and its participation in photochemical smog. Previous research has shown that some of the nitric oxide generated by combustion is later destroyed by coal char. Nitric oxide reacts with carbon significantly at temperatures characteristic of a fluidized bed combustor. The reaction is NO + C = products (CO, CO/sub 2/, N/sub 2/). The relative amount of each carbon oxide is dependent upon the reaction temperature. A 15-cm diameter fluidized bed was used to study this reaction using freshly pyrolyzed Utah subbituminous coal char in a bed of sand fluidized by a mixture of nitric oxide and nitrogen. Data were collected in the form of nitric oxide concentration versus reactor bed height for a range of temperatures and char weights with all other variables held constant. The temperature range studied was 650 to 860/sup 0/C and the char weight range was 0.3 to 1.0 wt % of the total bed weight. The nitric oxide concentration in and above the reaction zone (zone of fluidized solids) of the fluidized bed reactor decreased with the increase of either temperature or char weight in the bed, and the overa-1 nitric oxide conversion was shown to be a linear function of the char weight.

• Research Organization: West Virginia Univ., Morgantown (USA). Dept. of Chemical Engineering
• DOE Contract Number: AT21-81MC16473
• OSTI ID: 5062150
• Report Number(s): DOE/MC/16473-2105; ON: DE86006585
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
FLUE GAS
DENITRIFICATION
FLUIDIZED-BED COMBUSTORS
DESIGN
OPERATION
NITROGEN OXIDES
CONTROL
ACID RAIN
AIR POLLUTION CONTROL
COAL
COMBUSTION
HEAT TRANSFER
SMOG
ATMOSPHERIC PRECIPITATIONS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTORS
ENERGY SOURCES
ENERGY TRANSFER
FOSSIL FUELS
FUELS
GASEOUS WASTES
MATERIALS
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
RAIN
THERMOCHEMICAL PROCESSES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)