3176 



Chapter 26 



Fuel cell burners. — Fuel cell burners (fig. 26-8) are an adaptation of the 

 Dutch oven design; drying and gasification of the fuel occur in the primary 

 furnace, and combustion is completed in the secondary furnace. Fuel is metered 

 into the primary furnace, which is a vertical, refractory-lined cylinder with a 

 water-cooled grate. Here the fuel is partially combusted, the volatiles pass into 



EXHAUST GAS 



STEAM OUT 



FIRE TUBE 



BOILER 



OR 



PACKAGED 



WATER TUBE 



BOILER 



FUEL 

 BIN 



P,r/^^tr/^*^-/r,r-,r>,r^ 



OVERFIRE 

 AIR INLET 



FORCED 



DRAFT 



FAN 



C 



/ V 



/ y 



hiiiiiiiiiiEnn/ / 



/ y 



GRATES 



I 





^7777/A 



INDUCED 



DRAFT 



FAN 



Figure 26-8. — Fuel cell furnace system. (Drawing after Junge 1975a.) 



the upper chamber where burning is completed. Boilers of this type are common 

 in the Western United States, where they are used for kiln-drying lumber. They 

 generally have capacities of 10,000 to 30,000 lb of steam per hour when 



