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ECN publication
Combined combustion of biomass, municipal sewage sludge and coal in anatmospheric fluidised bed installation
Published by: Publication date:
ECN 1996
ECN report number: Document type:
ECN-RX--96-054 Other
Number of pages: Full text:
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Co-combustion of biomass or municipal sewage sludge with coal in afluidised bed installation influences the combustion behaviour and the flue gas emissions. In the case of coal-wood and coal-straw co-combustion the concentrations of NOx, SO2 and CO in the flue gas decreased with increasing biomass contribution in the fuel mixture. Co-combustion of coal and sewage sludge resulted in a substantial increase in SO2 concentration in the flue gas upon increasing the sludge ratio. Compared with coal-firing, the concentration of chlorine in the flue gas increased when increasing the amount of straw or sewage sludge. 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 relatively short time of operation, ash agglomeration did not interfere with the completion of the test programme. 3 figs., 4 tabs.

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