This fine and moist coal began to cause major flow problems in the conveying system, which had tall drops and sudden changes in direction. Transfer points within the system would not always reliably move the material. Coal would build up in the chutes, decreasing the cross-sectional area and eventually plugging the chutes completely. Plant operators would have to clear the chutes, which meant that not only was the plant experiencing increased downtime, but the employees had to leave their tasks to restart the flow.
Jenike & Johanson (J&J) was hired to perform flow property testing to determine the coal’s flow behavior based on its moisture content. Using this information, J&J was able to use Discrete Element Modeling (DEM) analysis to determine the source of flow problems in the power generation company’s transfer chutes as well as modifications needed to address the problems. The DEM simulation of the material flow confirmed that the drops and tight turns were responsible for the system’s unreliability. J&J then proposed a new configuration, working within the confines of the original system that would restore proper flow through smaller impact angles and consistent contact between the coal and the equipment.
Since the chutes were modified to handle coal that contained more fines and moisture, there has been no plugging or buildup at transfer points. J&J’s suggested design has allowed the system to operate reliably.
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Jenike & Johanson is the world’s leading company in powder and bulk solids handling, processing, and storage technology.Over the past 55 years, Jenike & Johanson has tested over 11,000 unique powders and bulk solids and worked on more than 7,500 projects, giving their team the broadest real-world and in-depth experience in the industry ...