Expansion of Coal Preparation Plant Simulator. Progress Report, April 1-June 30, 1981

摘要

The following items have been completed, or partially completed. The module to predict the moisture content of each coal flow-stream has been completed. This module determines moisture content as a function of size and specific gravity, and is callable from routines within the program. The routine does, however, make use of a few key physical parameters whose values are not accurately known. Thus, the user should exercise some discretion in interpreting the results of these calculations. Substantial progress has been made on the dewatering module. Preliminary work has been completed, on a centrifuge model, and work is now in progress on a vacuum filter model. Some additional refinements will be incorpoated. Upon completion of these models we plan to consider static thickeners and cyclone thickeners. Thermal dryers will also be considered if time permits. A prototype froth flotation module utilizes a model based upon a reaction-rate concept. The flotation rate of each substance is assumed to be proportional to the concentration of that substance in the pulp. An overall plant summary being added to the very end of the output will contain information on flowrate, percent ash, percent sulfur, moisture Btu content and lbs. SO sub 2 /million Btu for the feed stream and the combined clean coal, middlings and refuse streams leaving the plant. We also plan to add some overall economic parameters indicating the cost of cleaning a ton of feed, a ton of clean coal and a ton of clean coal plus middlings. The latter calculations will be based upon overall cost data entered as input data. (ERA citation 06:028126)