STEAM BOILERS 



329 



FIG. 223. STRAW BURNER RETURN-FLUE BOILER 



449. Direct-flue boilers, (Fig. 224), can be more easily 

 changed from coal burners to straw burners. This is 

 generally done by adding a feeding tube with an enclosed 

 drop-hinge door, by removing the grates and inserting a 

 dead plate with short grates in front of it, and by placing 

 a deflecting arch composed of firebrick in the fire box. 



FIG. 224. STRAW BURNER DIRECT-FLUE BOILER 



