Ash transformation in suspension fired boilers co-firing coal and straw: Final report, PSO-Eltra 4766

Yuanjing Zheng, Peter Arendt Jensen, Anker Degn Jensen, Bo Sander, Helle Junker

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The properties of the ash from co-firing of coal and straw have a large influence on boiler operation, flue gas cleaning equipment and appropriate utilization of the fly ash. A study on the fuel composition and local conditions influence on fly ash properties has been done by making entrained flow reactor experiments with co-firing of coal and straw, making mineral and alkali vapor laboratory reactor experiments and by developing a model of KCl reaction with kaolin. The results include correlations that can be used to estimate the speciation of potassium in the fly ash when co-firing straw and bituminous coal. The laboratory experiments indicated which mineral types and local conditions that provide the most efficient binding of potassium to species with a high melting point, and where a simultaneous release of chlorine as gaseous HCl takes place.
Original languageEnglish
PublisherDTU Chemical Engineering
VolumeMain report
Number of pages12
Publication statusPublished - 2009

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