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Title:
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Combined combustion of biomass, municipal sewage sludge and coalin an atmospheric fluidised bed installation
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Author(s):
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Published by:
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Publication date:
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ECN
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1995
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ECN report number:
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Document type:
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ECN-C--95-096
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ECN publication
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Number of pages:
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Full text:
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34
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Download PDF
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Abstract:
Co-firing biomass or sewage sludge with coal in a fluidized bedinstallation influences the combustion behaviour and the flue gas emissions.
In the case of coal/wood co-combustion the concentrations of NOx, SO2 and
CO in the flue gas were lower compared with coal-firing. No operational
problems were observed with co-firing wood and coal. In the case of straw and
sewage sludge agglomeration of the bed material occurred; adaptations of the
combustion conditions are necessary for commercial applications. Due to the
relative low time of operation for the combustion tests, ash agglomeration
did not interfere with the completion of the test programme. Lower combustion
temperatures might prevent agglomeration. Compared with coal-firing the
concentration of chlorine in the flue gas increased when increasing the
amount of straw or sewage sludge. The tests showed that only addition of wood
resulted in lower concentrations of chlorine in the flue gas; straw and
sewage sludge contained relatively high amounts of chlorine. In the case of
sewage sludge a dramatic increase in the halogen content (Cl, Br and F) of
the flue gas was found. Co-combustion of straw has a beneficial effect on the
SO2 and NOx emissions, although the effect on the SO2 content is less
pronounced compared with co-firing wood. Co-firing sewage sludge results in
higher SO2 emissions and comparable NOx emissions. From the tests it
appeared that co-firing wood can be performed without difficulties and has a
beneficial effect on the flue gas emissions. 10 figs., 11 tabs.
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