Investigation in NO{sub x}-formation at combustion of sewage sludge in a commercial scale bubbling fluidized bed
- Lurgi Energie und Umwelt GmbH, Frankfurt (Germany)
In 1993, the central sludge incineration plant at Dordrecht (NL) was commissioned. This plant disposes of the residues of 100 local sewage works; in three identical trains app. 54,000 t/a of dry matter are incinerated, each train treats app. 10--12t/h of raw sludge (app. 7.5 MW); a fourth train is currently under construction and will be commissioned shortly. For a test period of 24 h NO{sub x} emissions may vary between {approximately}50 mg/m{sub n}{sup 3} and approximately 600--800 mg/m{sub n}{sup 3} at process upsets. The experimentally well defined correlation of NO{sub x}-formation even under large scale operating conditions serves as a starting point for further process modelling. Conclusions are: for fluctuating operating condition of a large scale commercial plant NO{sub x}-emissions are closely related to fluid bed temperatures; by controlling fluid temperatures NO{sub x}-emissions can be maintained at approximately <200 mg/m{sub n}{sup 3}; effects of operating condition like feed moisture or O{sub 2}-concentration in flue gas are secondary and relate to changes in temperature profile; and for a wide range of operating conditions the NO{sub x}-formation can be modelled by a pseudo first order reaction with good agreement of experimental and theoretical data.
- OSTI ID:
- 357878
- Report Number(s):
- CONF-9705116-; ISBN 0-7918-1557-9; TRN: IM9932%%223
- Resource Relation:
- Conference: 14. international conference on fluidized bed combustion, Vancouver (Canada), 11-16 May 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the 14. international conference on fluidized bed combustion: Volume 2; Preto, F.D.S. [ed.] [Canada Centre for Mineral and Energy Technology, Ottawa, Ontario (Canada). Energy Technology Centre]; PB: 647 p.
- Country of Publication:
- United States
- Language:
- English
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