Feasibility of utilizing a rotating fluidized bed for the removal of sulfur from hot gases. Progress report
The RFB provides an option for coal combustion systems by separating the desulfurization of hot combustion product gases from the combustion process itself. Fluid-bed combustors conventionally combine the two processes and, as a result, the rapid combustion process is carried out in equipment whose design is dominated by the requirements of the slower and temperature-specific desulfurization process. Neither process can be optimized and, in fact, the specifics of the combined reaction chemistry are unclear. Separation of the processes allows consideration of alternative combustors, sorbents, and sorption devices. The RFB desulfurizer has the potential to reduce equipment sizes through improvements in reaction rates and sorbent utilization. Additionally, separation of the combustion and sorption reactions leads to a relatively clean separation of ash and spent sorbent allowing for better waste utilization or disposal. Several process advantages are associated with the use of the rotating rather than the stationary fluidized bed for sulfur removal. These stem primarily from two characteristics inherent in the multi-g system. First, smaller particles can be retained in the fluidized bed, with the following three important advantages: (a) Smaller particles will contribute to higher sulfation rates because of increased surface area; the better rates will lead to a shorter gas residence time; (b) Greater sorbent utilization will occur. Sulfation causes the buildup of a product layer on the outside of the sorbent particles, which corresponds to a higher fraction of sorbent utilization in the case of a small particle than with a larger particle; (c) The low gas velocities possible in the fluidization of small particles will permit relatively long residence times.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5043831
- Report Number(s):
- BNL-51253
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMBUSTION PRODUCTS
DESULFURIZATION
HOT GAS CLEANUP
FLUIDIZED BED
COAL
FEASIBILITY STUDIES
OPTIMIZATION
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
PURIFICATION
010800* - Coal
Lignite
& Peat- Waste Management
014000 - Coal
Lignite
& Peat- Combustion