PRINCIPLES OF NAVAL ENGINEERING 



DRY PIPE 



ECONOMIZER 



CIRCULATOR TUBES 

 (FROM UPTAKE HEADER) 



STEAM SOOT 

 BLOWER ELEMENTS 



UPTAKE 

 HEADERS 



RISER TUBES FROM 

 WATER WALL( SIDEWALL) 

 UPTAKE HEADER 



SUPERHEATER 

 OUTLET 



GENERATING 

 TUBES 



SUPERHEATER 

 ACCESS DOOR 



JUNCTION HEADER 

 (MUD DRUM) 



SUPERHEATER 

 TUBES 



FURNACE 

 ACCESS DOOR 



SUPERHEATER 

 HEADERS 



BOTTOM BLOW 

 VALVE CONNECTION 



WATER WALL 

 (ISIDEWALL) 

 TUBES 



WATER WALL 

 ( SIDEWALL ) 

 DOWNTAKE 

 HEADER 



SUPERHEATER 

 SCREEN TUBES 



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Figure 10-15.— Cutaway view of header-type boiler. 



38.33X 



between the inner and the outer casing. Two 

 vertical water wall uptake headers are simi- 

 larly installed at the two rear corners of the 

 boiler. The water wall tubes are rolled into a 

 downtake header at the front and an uptake head- 

 er at the rear; they are arranged on the same 

 slope as the generating tubes. 



Water is supplied to the water wall downtake 

 headers from the junction header. Steam and 



water rise through the water wall tubes to the 

 uptake headers, and then through the riser tubes 

 that connect the uptake headers to the steam 

 drum. 



As may be seen in figures 10-15 and 10-16, 

 an economizer is located behind the steam drum, 

 in the way of the combustion gas exit. 



The boiler is completely enclosed in an 

 insulated steel casing, and an outer casing is 



246 



