The use of a circulating fluidized bed absorber for control of SO[sub 2] emissions
- comps.; Cincinnati Univ., OH (United States). Dept. of Civil and Environmental Engineering
This project has been proposed to offer a low capital cost flue gas desulfurization (FGD) system which provides high sorbent utilization with operational simplicity. The system would be applicable to either an industrial or utility boiler and could be easily retrofitted in order to meet any changes in SO[sub 2] emission regulations. The results given in this report indicate the effectiveness of the approach. Basically, the circulating fluidized bed absorber (CFBA) consists of a reactor where the solid sorbent is contacted with the high velocity flue gas and the solids are entrained. A dense phase and entrained phase fluidization region exists (dependent on the particle size and density, and the gas velocity) which promote good gas/solid recycle. A gas/solid separator (cyclone) concentrates the sorbent for subsequent recycle. A pilot scale CFBA unit has been constructed and was evaluated on a number of commercially available sorbents. The reactor consists of 6 inch diameter by 21 foot fluidized bed with two recycle cyclones. Gas flow rate in the experiments was nominally 70 scfm and temperatures ranged from 250[degree]F--900[degree]F. Variables tested included the sorbent loading, recycle rate, sorbent particle size, gas velocity and temperature, and (for calcium oxide sorbent) particle wetting. The results have indicated that over 90% of the inlet sulfur dioxide concentration may be removed at inlet stoichiometric conditions by the use of a sodium bicarbonate sorbent with a solids loading of 6 in-H[sub 2]O. The efficiency of SO[sub 2] removal increases with decreasing particle size for sodium bicarbonate, and decreases with increasing temperature after an optimum of around 400[degree]F inlet gas temperature.
- Research Organization:
- Ohio Coal Development Office, Columbus, OH (United States); Cincinnati Univ., OH (United States). Dept. of Civil and Environmental Engineering
- Sponsoring Organization:
- STOFOH; Ohio State Government, Columbus, OH (United States)
- OSTI ID:
- 6414875
- Report Number(s):
- OCDO-93015852; ON: TI93015852; CNN: CDO/R-86-20
- Country of Publication:
- United States
- Language:
- English
Similar Records
The use of a circulating fluidized bed absorber (CFBA) for control of sulfur dioxide
Low temperature SO{sub 2} removal with solid sorbents in a Circulating Fluidized Bed Absorber. Quarterly report, March 1992
Related Subjects
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ACID CARBONATES
ADSORBENTS
ALKALI METAL COMPOUNDS
CHEMICAL REACTIONS
CIRCULATING SYSTEMS
COMPARATIVE EVALUATIONS
CONCENTRATORS
CYCLONE SEPARATORS
DESULFURIZATION
DOCUMENT TYPES
EFFICIENCY
EQUIPMENT
EVALUATION
FLUE GAS
FLUIDIZED BEDS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
INERTIAL SEPARATORS
PARTICLE SIZE
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
PROGRESS REPORT
RECYCLING
SEPARATION EQUIPMENT
SIZE
SODIUM COMPOUNDS
THERMAL POWER PLANTS
WASTES