Principles of naval engineering - Historic Naval Ships Association

PRINCIPLES OF NAVAL ENGINEERINGDRY PIPEECONOMIZERCIRCULATOR TUBES(FROM UPTAKE HEADER)STEAM SOOTBLOWER ELEMENTSUPTAKEHEADERSRISER TUBES FROMWATER WALL( SIDEWALL)UPTAKE HEADERSUPERHEATEROUTLETGENERATINGTUBESSUPERHEATERACCESS DOORJUNCTION HEADER(MUD DRUM)SUPERHEATERTUBESFURNACEACCESS DOORBOTTOM BLOWVALVE CONNECTIONWATER WALL(ISIDEWALL)TUBESWATER WALL( SIDEWALL )DOWNTAKEHEADERSUPERHEATERHEADERSSUPERHEATERSCREEN TUBESiV';sirr:i^£asi^s^^*;;j-:'; :'i-3Siiv ir: '.Figure 10-15.— Cutaway view of header-type boiler.38.33Xbetween the inner and the outer casing. Twovertical water wall uptake headers are similarlyinstalled at the two rear corners of theboiler. The water wall tubes are rolled into adowntake header at the front and an uptake headerat the rear; they are arranged on the sameslope as the generating tubes.Water is supplied to the water wall downtakeheaders from the junction header. Steam andwater rise through the water wall tubes to theuptake headers, and then through the riser tubesthat connect the uptake headers to the steamdrum.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 aninsulated steel casing, and an outer casing is246