Flowability Of Moist Coal Combution Fly Ash

Abstract

In the combustion of coal the mineral contents remain as ash. The fine size fraction of the ash leaves the combustion zone with the
off-gas from which it is separated as fly ash. Depending on the physical and chemical properties these fly ashes can be utilized. An
essential parameter for the design and operation of transport equipment and storage facilities for fine grained materials is their
flowability. The moisture content of the material has considerable influence on the flowability because of the increasing influence
of the liquid bridges between the particles and the resulting capillary forces. In this study the influence of the moisture content on
the flow characteristics of a coal combustion fly ash was investigated. The fly ash sample was collected from the dust discharge of
the electrostatic precipitator of a power plant using Polish hard coal as fuel. The mass median diameter of the fly ash was approximately
20 μm. Microscopic images show that most of the particles are spheres. The flow properties of the fly ash were measured
using a ring shear tester. The moisture content of the sample was adapted by addition of water. The dry fly ash was characterized
by very good flow properties, the flowability ffc was in the category ‘easy flowing’. Significant decrease in flowability was found at
increased moisture contents. Additionally, the bulk density of the fly ash was influenced by the moisture content. Thus, the flow-
-relevant parameters which have to be considered in design of transport and storage facilities of fine granular material worsened
with increasing moisture content.