Reaction Kinetics and Physical Mechanisms of Ash Agglomeration. Progress Report, February 24-May 23, 1985

摘要

The research addresses the key issues of ash particle contact, conditions and rates of reaction of mineral matter, and agglomeration conditions in fluidized-bed gasification. To obtain coals with properties of interest in the ash agglomeration studies, a priority system was used for initial screening of candidate coals. The factors considered, in order of importance, are iron content, pyrite content, and calcium carbonate content. Ten bituminous coals were analyzed for ash content, pyritic and total iron, and calcium. Six of these were selected for study. To cover a wide range of these variables, four coals were selected that contain high, medium, and low pyritic iron in combination with a low calcium concentration. The search continues for two coals with medium and low pyritic iron in combination with a high calcium concentration. The video system for the hot-stage microscope was also set up and an experimental procedure developed for the reaction rate screening studies. Several mineral combinations were investigated with this system including siderite/flint clay, calcite/flint clay, and silica/pyrite. (ERA citation 11:012533)