Discussion
A part of the blowdown energy losses in a boiler can be recovered by which one of the following ways?
Answer: C
Energy is recovered by flashing the blowdown to generate low-pressure steam.
Blowdown is hot water drawn from the boiler at boiler pressure to limit dissolved solids. In a flash tank its pressure is reduced, part of it flashes to clean low-pressure steam that can feed the deaerator or process heating, and the remaining hot water can preheat the make-up water in a heat exchanger.
Blowdown cannot be avoided, because solids would build up and cause scaling and carryover. Recycling it to the drum or mixing it with feedwater would return the concentrated solids to the boiler, defeating its purpose.
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