Evaluation of freeboard performance in a fluidized bed combustor

Technical Report · Fri Dec 01 04:00:00 EST 1989

DOI:https://doi.org/10.2172/5407349· OSTI ID:5407349

Krishnan, R. P.; Anthony, J.; Chandrasekhar, S.; Murthy, A. V.; Rajaram, S.; Rao, A. V.J.; Rajavel, M.; Srinivasan, S. ^[1]

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1. Oak Ridge National Lab., TN (USA)

Under a cooperative agreement between the US Agency for International Development (USAID) and the Government of India (GOI), a joint research project in fluidized bed combustion (FBC) was carried out by the Bharat Heavy Electricals Ltd. (BHEL), India, and the Oak Ridge National Laboratory (ORNL). The project was aimed at obtaining basic engineering data on the combustion of high-ash Indian coals (up to 45% ash), and coal washery rejects (up to 70% ash). Quantitative measurements of overall combustion efficiency, in-bed and freeboard combustion, in-bed heat transfer coefficient, freeboard heat transfer coefficient, flue gas composition and temperature profiles in the bed and freeboard were of particular interest. A 1 m {times} 1 m cross section, 11.0-m high, refractory-lined FBC was erected at BHEL, Trichy. The combustor was designed as a hot water generator with a capacity of 90 t/h at 10 kg/cm{sup 2} and 179{degree}C. Tests were conducted on a sub-bituminous Indian coal ({approximately}38% ash) and a coal washery reject (65% ash), with and without flyash reinjection. Both underbed and overbed fuel feeding modes were tested in the facility. Three series of long-duration tests typically lasting 40 to 50 h were conducted in the facility for a total of 600 h after about 300 h of shakedown testing. Operational problems associated with underbed/overbed feeding, flyash reinjection and ash removal were identified. 26 refs., 44 figs., 1 tab.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: AID
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5407349
• Report Number(s): ORNL/TM-11379; ON: DE90004391
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
CARBONACEOUS MATERIALS
COAL
COMBUSTORS
DESIGN
DOCUMENT TYPES
EFFICIENCY
ENERGY SOURCES
ENERGY TRANSFER
FLUE GAS
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
GASEOUS WASTES
HEAT TRANSFER
MANAGEMENT
MATERIALS
PERFORMANCE
PHYSICAL PROPERTIES
PROGRESS REPORT
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
WASTE MANAGEMENT
WASTES