To prevent scale buildup and to ensure high steam quality and boiler operating efficiency, boiler water quality must be maintained. Chemical treatment alone can’t do the job, so water containing concentrated dissolved and suspended mineral solids is removed continuously through a top blowdown system. As the dirty blowdown water is removed from the boiler drum, it is replaced with fresh makeup water which improves the boiler water quality.
- Too much blowdown wastes heat and chemical treatment.
- Too little blowdown results in operation and maintenance problems.
To get the full benefits of blowdown heat recovery, the blowdown flow must be continuous, not intermittent!