Discussion
Blowdown can be reduced by
Answer: A
Correct answer: improving the feedwater treatment so fewer solids enter
Blowdown exists to hold the dissolved solids in the drum below a limit, and its rate is set by how fast those solids arrive. Removing them upstream - better softening, demineralisation, more condensate returned - means less water has to be discharged to hold the same concentration. Nothing done to the pressure or the air changes the solids balance.
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