The afterboiler section

Steam leaving the drums of large industrial and utility boilers is commonly directed to the plant. The superheated steam can then be used to heat the processes and to drive turbines which function to drive some other rotating piece of equipment.

The largest turbines are used to drive generators and produce electric power. Once steam is used in the plant, it is condensed and returned to the feedwater system. Condensate re-enters the preboiler, having made one complete pass through the steam generating system.

In a system with a properly maintained chemical treatment program, condensate is high in purity. As mentioned earlier, this reduces the amount of water which must be pretreated before it enters the boiler.

In addition, because condensate has a high heat value, less energy is required to heat the feedwater. The more condensate your plant can return to the boiler, the lower your make-up and fuel requirements will be. This results in increased energy efficiency of your boiler.

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