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ECN publication
Combined combustion of biomass, municipal sewage sludge and coalin an atmospheric fluidised bed installation
Published by: Publication date:
ECN 1995
ECN report number: Document type:
ECN-C--95-096 ECN publication
Number of pages: Full text:
34 Download PDF  

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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