A method for improving load turndown in fluidized bed combustors

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6635192

Brown, R C; Foley, J E

The authors are investigating a new concept in the design of fluidized bed combustors that improves load turndown capability. This design is based on control of heat transfer rate independent of combustion rate. The configuration under investigation consists of a central combustion bed surrounded by an annular fluidized bed that establishes overall heat transfer rate from the inner combustion bed. The two beds, physically divided by a wall, are fluidized independently by separate air plenums. Experiments were performed to evaluate the usefulness of this device in improving load turndown. For a given combustor firing rate and air-to-fuel ratio, a wide variation in combustion temperature could be achieved by controlling the flow of fluidization air to the annular fluidized bed. In other tests, a load turndown ratio of 8.7 was achieved while combustion temperature was held constant. Greater load turndowns are expected as a result of the use of smaller particles and higher fluidization velocities in the annular bed. 8 refs., 6 figs., 1 tab.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6635192
• Report Number(s): IS-M-617; CONF-870816-29; ON: DE89003743
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
COMBUSTORS
DESIGN
EFFICIENCY
ENERGY TRANSFER
EQUATIONS
FLOW RATE
FLUIDIZED-BED COMBUSTORS
HEAT TRANSFER