Reduction Of Nitrous Oxide Emission By A
Smaller Air To Fuel Ratio In A Large-scale
Sewage Sludge Fluidized Bed Combustor
Author(s)
L. D. Korving, C. Schilt & W. De Jong
Abstract
A full-scale experimental study showed a 70% reduction of the nitrous oxide
emission from the combustion of sewage sludge by a smaller air-to-fuel ratio.
The experiments were performed on the furnaces of one of Europe’s largest
sludge-incinerators, Slibverwerking Noord-Brabant. The results were
implemented in the daily operation and they significantly reduced the emission
of nitrous oxides without increasing emissions, such as NOx and NH3. The study
showed a correlation between the NOx emission and the bed temperature, while
the N2O emission correlates to the free board temperature. With the lower
air-fuel ratio the bed temperature could be maintained at constant levels while
increasing the temperature in the freeboard, thus achieving a reduced N2O
emission without increasing the NOx emission. The lower air input also reduces
the energy use of the forced and induced draught fans, giving a substantial
financial benefit. A simplified chemical reactor model was set up for the
freeboard of the furnace. The model fits with the experimental results of
in-furnace measurements. In addition, a hypothetical case shows that improving
the reactor via a Plug Flow Reactor configuration is most beneficial.
Keywords: nitrous oxide, nitrogen oxides formation, fluidized bed combustion,
air-fuel ratio, sewage sludge, temperature, lambda factor.
Keywords
nitrous oxide, nitrogen oxides formation, fluidized bed combustion,air-fuel ratio, sewage sludge, temperature, lambda factor
Related Book
Other papers in this volume
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