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Diagram of a superheater
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Figure 4-8.—Vertical superheater. As  the  steam  passes  through  the  super- heater tubes, it is heated by the hot gases from combustion,  which  flow  around  the  tubes. In some boilers, the superheater headers are installed parallel with the water drum; and the tubes are installed vertically (fig. 4-8). These are called vertical superheaters. Another boiler internal fitting is the desuper- heater. It maybe located either in the steam drum or in the water drum. All the steam generated in a  single-furnace  boiler  is  led  through  the superheater.   However,   since   some   auxiliary machinery  is  not  designed  for  superheated  steam, the steam must be cooled down. This is done with a  desuperheater.  The  desuperheater  gets  steam from the superheater outlet, as shown in figure 4-9.  The  desuperheater  is  submerged  in  water either in the steam drum or in the water drum. As the steam passes through the desuperheater, Figure 4-9.—Relative position of desuperheater tubes. it is cooled for use in the auxiliary steam systems. 4-10






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