Abstract
Abstract: The continuously changing and decreasing quality of lignite increases the tendency of fouling or slagging in lignite boilers. The investigation of the structure and composition of filter ashes and crusts will have an important contribution to the understanding of their formation resulting in less corrosion and fouling of lignite power plants, especially for problematic fuels. This will minimise failures due to fouling, sintering and slagging of crusts at the heat exchanger surfaces. The filter ashes consist of clay, anhydrite, quartz, and iron compounds. The crusts provide a high open porosity of about 50 % and are iron(Fe-)rich or aluminosilicate-based as well as show an inhomogeneous structure in CT. Both, dense and porous structural constituents can be identified, which suggests a shell-like structure due to the constant adhesion of softened or melted particles.
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