Sewage sludge combustion in the fluidized bed: Comparison of stationary and circulating fluidized bed techniques
- Technical Univ. of Hamburg-Harburg, Hamburg (Germany)
This paper presents results of investigations concerning CO and NO{sub x} emissions during the incineration of different digested sewage sludge samples in stationary and circulating fluidized bed combustors. The stationary fluidized bed combustion rig is 9 m high while the circulating fluidized bed combustor has a total height of 15 m. Both combustors are 100 mm in diameter. The digested sewage sludges originated from different municipal wastewater treatment plants. They were fed into the combustors as either predried granulates with 6--13 wt.-% water contents or as a slurry with water contents between 70 and 80 wt.-%. For comparison, bituminous and brown coals were also investigated. Measurements from both combustors have shown that predried sludges yield much higher NO{sub x} emission levels than coals under equivalent combustion conditions. Combustion of wet sludges resulted in extremely low NO{sub x} emissions compared to predried sludges. Staged combustion of predried sludge granulates proved to be effective for lowering the emissions of NO{sub x}. Experiments with wet sludges showed no significant difference in CO and NO{sub x} emissions between stationary and circulating fluidized bed combustors although with predried sludges and coals, clearly lower NO{sub x} emissions were measured from the circulating fluidized bed test unit.
- OSTI ID:
- 287955
- Report Number(s):
- CONF-950522-; ISBN 0-7918-1305-3; TRN: IM9639%%575
- Resource Relation:
- Conference: 13. international conference on fluidized-bed combustion, Orlando, FL (United States), 7-10 May 1995; Other Information: PBD: 1995; Related Information: Is Part Of 13. international conference on fluidized bed combustion: Proceedings. Volume 2; Heinschel, K.J. [ed.] [Air Products and Chemicals, Inc., Allentown, PA (United States)]; PB: 823 p.
- Country of Publication:
- United States
- Language:
- English
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