Chapter 10- PROPULSION BOILERS 



Fuel Oil Burners 



Almost all fuel oil burners used on naval 

 propulsion boilers are mounted on the boiler 

 front. Special openings called burner cone open- 

 ings are provided in the furnace front for the 

 burners. 



The two main parts of a fuel oil burner are 

 the atomizer assembly and the air register as- 

 sembly. The atomizers divide the fuel oil into 

 very fine particles; the air registers permit 

 combustion air to enter the furnace in such a 

 way that it mixes thoroughly with the finely 

 divided oil. In addition to the atomizer assembly 

 and the air register assembly, a fuel oil burner 

 includes various valves, fittings, connections, 

 and (on new construction) burner safety devices 



which prevent spillage of oil when an atomizer 

 assembly is removed from the burner while the 

 burner root valve is still open. 



ATOMIZERS.— Three main kinds of atomiz- 

 ers are now in use on naval boilers. Straight- 

 through-flow atomizers are used on most boil- 

 ers. Return-flow atomizers are used on many of 

 the newer ships, particularly those equipped with 

 automatic combustion controls. Steam-assist 

 atomizers are used on boilers in some of the 

 newest ships. 



A fuel oil burner with a straight-through- 

 flow atomizer is shown in cross section in 

 figure 10-10. Figure 10-11 shows how burners 

 of this type look when installed at the boiler 

 front. 



INNER CASING 



STATIONARY^! 

 AIR FOILS 



BURNER CONE OPENING |, 



INNER CASING 



OUTER CASING 



AIR DOOR HANDLE 



GOOSE NECK 



BURNER (SIDE VIEW) 



AIR DOOR HANDLE 



Hi- 



YOKE 

 DISTANCE PIECE 

 MOVABLE AIR DOORS 

 OUTER CASING (BOILER FRONT) 



BURNER BARREL 



BURNER COVER PLATE 



ATOMIZER VALVE 



BURNER (FRONT VIEW) 



38.69 

 Figure 10-10.— Cross-sectional view of fuel oil burner with straight-through-flow atomizer. 



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