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Show ANALYSIS Based on the above an ideal solid fuel combustion system would encompass the following features: 1. Complete reduction of the fuel to ash without slagging, minimizing disposal, furnace cleanout, and pollution control and maximizing conversion of available fuel energy. 2. Minimize excess air thereby minimizing furnace mass flow and flue gas and by so doing minimize flue gas heat loss and flow to pollution abatement-systems. 3. Minimize furnace residence time therefore maximizing adapatability to current fossil fuel fired furnaces which are existing or can be purchased, packaged, compact, and relatively inexpensively. 4. Fitable to existing fossil fuel fired processes. This would require having similar flame characteristics to fossil fuels and rapid firing rate response. 5. Consistent with economic considerations, an ideal system would require minimal time for retrofit, start up, and operator training. In designing our DAZ solid fuel scroll burner, we have tried to approximate these ideals. The burner is a variation of our dual air zone register burner allowing incorporation of any advancements we have made to this register over our 70 year history. (Figure #2). Pulverized solid fuel is air conveyed into the solid fuel scroll. The scroll distributes the fuel between two concentric, counterrotating combustion air streams where the combustion air scrubs and mixes with the solid fuel. The counterrotating air zones are controlled by register louvers which move with burn 27-8 |