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ABSTRACT: Coal Gasification processes rely on moving coal (either dry or wet) to the gasifier. For wet processing of coal, the material is first slurried as a 63-65% solids mixture with water and additives. This coal slurry exhibits pseudo-plastic (shear thinning) behavior upon mixing yet settles readily when unagitated. The gasifier works best with a reliable and nonvariable feedrate so mixers are used for storage of the coal slurry. Slurry rheology combined with the volume required to fuel a utility-scale power plant make design/engineering decisions a critical part of the plant and equipment selection. LIGHTNIN performs laboratory testing to determine the correct impeller type and accurate scale-up for agitation equipment in these large vessels. |
