full width of the tower fig2 4 baffles must be configured to promote mass flow of the solids through the processor while moving the solids back and forth to and fro as it descends through the processor each baffle has an apex angle of approximately 50 u00b0 60 u00b0 the angle being determined by the material flow characteristics of the coal the coal size is a maximum of 3 inches preferably being 2 inches a series of baffles are arranged adjacent to one another on any particular plane with a minimum spacing between the individual baffles of approximately 2 u00bd 3 times the size of the largest coal particles introduced into the top of the processor for example if the coal has a maximum size of 2 inches the spacing between the baffles would be between 5 and 6 inches it is preferred that the coal does not exceed two 2 inches this spacing permits the coal to pass freely through the processor by gravity the perpendicularly alternated levels of inlet and outlet baffles are configured to gently mix the coal as it descends through the processor while providing uniform process gas distribution and efficient contact with the coal without the high pressure drop required in other processor systems space the process gas only passes through a relatively shallow layer of.